Changeset 176:d0e7145e70b7

Timestamp:

05/13/08 17:03:53 (2 years ago)

Author:

Madtree <madtree@…>

Branch:

renderer

Message:

Split tr_image.c source file (allign with icculus sources).

Files:

• Makefile (modified) (2 diffs)
• src/jpeg-6/jdatasrc.c (modified) (5 diffs)
• src/jpeg-6/jpeglib.h (modified) (1 diff)
• src/qcommon/qfiles.h (modified) (1 diff)
• src/renderer/tr_image.c (modified) (3 diffs)
• src/renderer/tr_image_bmp.c (added)
• src/renderer/tr_image_jpg.c (added)
• src/renderer/tr_image_pcx.c (added)
• src/renderer/tr_image_png.c (added)
• src/renderer/tr_image_tga.c (added)
• src/renderer/tr_local.h (modified) (1 diff)

Makefile

@@ -1050 +1050 @@
   \
   $(B)/client/jcapimin.o \
+  $(B)/client/jcapistd.o \
   $(B)/client/jchuff.o   \
   $(B)/client/jcinit.o \
@@ -1092 +1093 @@
   $(B)/client/tr_font.o \
   $(B)/client/tr_image.o \
+  $(B)/client/tr_image_png.o \
+  $(B)/client/tr_image_jpg.o \
+  $(B)/client/tr_image_bmp.o \
+  $(B)/client/tr_image_tga.o \
+  $(B)/client/tr_image_pcx.o \
   $(B)/client/tr_init.o \
   $(B)/client/tr_light.o \

src/jpeg-6/jdatasrc.c

@@ -21 +21 @@
 #include "jerror.h"
 
+#ifndef MIN
+#define MIN(a, b) ((a)<(b)?(a):(b))
+#endif
+
 
 /* Expanded data source object for stdio input */
@@ -27 +31 @@
   struct jpeg_source_mgr pub;   /* public fields */
 
-  unsigned char *infile;                /* source stream */
+  unsigned char *inbuf;         /* source stream */
+  size_t inbufbytes;
   JOCTET * buffer;              /* start of buffer */
   boolean start_of_file;        /* have we gotten any data yet? */
@@ -92 +97 @@
 {
   my_src_ptr src = (my_src_ptr) cinfo->src;
-
-  memcpy( src->buffer, src->infile, INPUT_BUF_SIZE );
-
-  src->infile += INPUT_BUF_SIZE;
+  size_t nbytes = MIN(src->inbufbytes, INPUT_BUF_SIZE);
+
+  if(!nbytes)
+  {
+    WARNMS(cinfo, JWRN_JPEG_EOF);
+    /* Insert a fake EOI marker */
+    src->buffer[0] = (JOCTET) 0xFF;
+    src->buffer[1] = (JOCTET) JPEG_EOI;
+    nbytes = 2;
+  }
+  else
+  {
+    memcpy( src->buffer, src->inbuf, nbytes);
+
+    src->inbuf += nbytes;
+    src->inbufbytes -= nbytes;
+  }
 
   src->pub.next_input_byte = src->buffer;
-  src->pub.bytes_in_buffer = INPUT_BUF_SIZE;
+  src->pub.bytes_in_buffer = nbytes;
   src->start_of_file = FALSE;
 
@@ -172 +190 @@
 
 GLOBAL void
-jpeg_stdio_src (j_decompress_ptr cinfo, unsigned char *infile)
+jpeg_mem_src (j_decompress_ptr cinfo, unsigned char *inbuf, size_t size)
 {
   my_src_ptr src;
@@ -199 +217 @@
   src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
   src->pub.term_source = term_source;
-  src->infile = infile;
+  src->inbuf = inbuf;
+  src->inbufbytes = size;
   src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
   src->pub.next_input_byte = NULL; /* until buffer loaded */

src/jpeg-6/jpeglib.h

@@ -875 +875 @@
 /* Caller is responsible for opening the file before and closing after. */
 EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
-EXTERN void jpeg_stdio_src JPP((j_decompress_ptr cinfo, unsigned char *infile));
+EXTERN void jpeg_mem_src JPP((j_decompress_ptr cinfo, unsigned char *buffer, size_t size));
 
 /* Default parameter setup for compression */

src/qcommon/qfiles.h

@@ -70 +70 @@
         int             jtrgLength;                     // number of jump table targets
 } vmHeader_t;
-
-
-/*
-========================================================================
-
-PCX files are used for 8 bit images
-
-========================================================================
-*/
-
-typedef struct {
-    char        manufacturer;
-    char        version;
-    char        encoding;
-    char        bits_per_pixel;
-    unsigned short      xmin,ymin,xmax,ymax;
-    unsigned short      hres,vres;
-    unsigned char       palette[48];
-    char        reserved;
-    char        color_planes;
-    unsigned short      bytes_per_line;
-    unsigned short      palette_type;
-    char        filler[58];
-    unsigned char       data;                   // unbounded
-} pcx_t;
-
-
-/*
-========================================================================
-
-TGA files are used for 24/32 bit images
-
-========================================================================
-*/
-
-typedef struct _TargaHeader {
-        unsigned char   id_length, colormap_type, image_type;
-        unsigned short  colormap_index, colormap_length;
-        unsigned char   colormap_size;
-        unsigned short  x_origin, y_origin, width, height;
-        unsigned char   pixel_size, attributes;
-} TargaHeader;
 
 

src/renderer/tr_image.c

@@ -24 +24 @@
 #include "tr_local.h"
 
-/*
- * Include file for users of JPEG library.
- * You will need to have included system headers that define at least
- * the typedefs FILE and size_t before you can include jpeglib.h.
- * (stdio.h is sufficient on ANSI-conforming systems.)
- * You may also wish to include "jerror.h".
- */
-
-#define JPEG_INTERNALS
-#include "../jpeg-6/jpeglib.h"
-
-#include "../qcommon/puff.h"
-
-
-static void LoadBMP( const char *name, byte **pic, int *width, int *height );
-static void LoadTGA( const char *name, byte **pic, int *width, int *height );
-static void LoadJPG( const char *name, byte **pic, int *width, int *height );
-static void LoadPNG( const char *name, byte **pic, int *width, int *height );
 
 static byte                      s_intensitytable[256];
@@ -822 +804 @@
 
 
-/*
-=========================================================
-
-BMP LOADING
-
-=========================================================
-*/
-typedef struct
-{
-        char id[2];
-        unsigned long fileSize;
-        unsigned long reserved0;
-        unsigned long bitmapDataOffset;
-        unsigned long bitmapHeaderSize;
-        unsigned long width;
-        unsigned long height;
-        unsigned short planes;
-        unsigned short bitsPerPixel;
-        unsigned long compression;
-        unsigned long bitmapDataSize;
-        unsigned long hRes;
-        unsigned long vRes;
-        unsigned long colors;
-        unsigned long importantColors;
-        unsigned char palette[256][4];
-} BMPHeader_t;
-
-static void LoadBMP( const char *name, byte **pic, int *width, int *height )
-{
-        int             columns, rows;
-        unsigned        numPixels;
-        byte    *pixbuf;
-        int             row, column;
-        byte    *buf_p;
-        byte    *buffer;
-        int             length;
-        BMPHeader_t bmpHeader;
-        byte            *bmpRGBA;
-
-        *pic = NULL;
-
-        //
-        // load the file
-        //
-        length = ri.FS_ReadFile( ( char * ) name, (void **)&buffer);
-        if (!buffer) {
-                return;
-        }
-
-        buf_p = buffer;
-
-        bmpHeader.id[0] = *buf_p++;
-        bmpHeader.id[1] = *buf_p++;
-        bmpHeader.fileSize = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.reserved0 = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.bitmapDataOffset = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.bitmapHeaderSize = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.width = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.height = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.planes = LittleShort( * ( short * ) buf_p );
-        buf_p += 2;
-        bmpHeader.bitsPerPixel = LittleShort( * ( short * ) buf_p );
-        buf_p += 2;
-        bmpHeader.compression = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.bitmapDataSize = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.hRes = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.vRes = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.colors = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-        bmpHeader.importantColors = LittleLong( * ( long * ) buf_p );
-        buf_p += 4;
-
-        Com_Memcpy( bmpHeader.palette, buf_p, sizeof( bmpHeader.palette ) );
-
-        if ( bmpHeader.bitsPerPixel == 8 )
-                buf_p += 1024;
-
-        if ( bmpHeader.id[0] != 'B' && bmpHeader.id[1] != 'M' ) 
-        {
-                ri.Error( ERR_DROP, "LoadBMP: only Windows-style BMP files supported (%s)\n", name );
-        }
-        if ( bmpHeader.fileSize != length )
-        {
-                ri.Error( ERR_DROP, "LoadBMP: header size does not match file size (%d vs. %d) (%s)\n", bmpHeader.fileSize, length, name );
-        }
-        if ( bmpHeader.compression != 0 )
-        {
-                ri.Error( ERR_DROP, "LoadBMP: only uncompressed BMP files supported (%s)\n", name );
-        }
-        if ( bmpHeader.bitsPerPixel < 8 )
-        {
-                ri.Error( ERR_DROP, "LoadBMP: monochrome and 4-bit BMP files not supported (%s)\n", name );
-        }
-
-        columns = bmpHeader.width;
-        rows = bmpHeader.height;
-        if ( rows < 0 )
-                rows = -rows;
-        numPixels = columns * rows;
-
-        if(columns <= 0 || !rows || numPixels > 0x1FFFFFFF // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF
-            || ((numPixels * 4) / columns) / 4 != rows)
-        {
-          ri.Error (ERR_DROP, "LoadBMP: %s has an invalid image size\n", name);
-        }
-
-        if ( width ) 
-                *width = columns;
-        if ( height )
-                *height = rows;
-
-        bmpRGBA = ri.Malloc( numPixels * 4 );
-        *pic = bmpRGBA;
-
-
-        for ( row = rows-1; row >= 0; row-- )
-        {
-                pixbuf = bmpRGBA + row*columns*4;
-
-                for ( column = 0; column < columns; column++ )
-                {
-                        unsigned char red, green, blue, alpha;
-                        int palIndex;
-                        unsigned short shortPixel;
-
-                        switch ( bmpHeader.bitsPerPixel )
-                        {
-                        case 8:
-                                palIndex = *buf_p++;
-                                *pixbuf++ = bmpHeader.palette[palIndex][2];
-                                *pixbuf++ = bmpHeader.palette[palIndex][1];
-                                *pixbuf++ = bmpHeader.palette[palIndex][0];
-                                *pixbuf++ = 0xff;
-                                break;
-                        case 16:
-                                shortPixel = * ( unsigned short * ) pixbuf;
-                                pixbuf += 2;
-                                *pixbuf++ = ( shortPixel & ( 31 << 10 ) ) >> 7;
-                                *pixbuf++ = ( shortPixel & ( 31 << 5 ) ) >> 2;
-                                *pixbuf++ = ( shortPixel & ( 31 ) ) << 3;
-                                *pixbuf++ = 0xff;
-                                break;
-
-                        case 24:
-                                blue = *buf_p++;
-                                green = *buf_p++;
-                                red = *buf_p++;
-                                *pixbuf++ = red;
-                                *pixbuf++ = green;
-                                *pixbuf++ = blue;
-                                *pixbuf++ = 255;
-                                break;
-                        case 32:
-                                blue = *buf_p++;
-                                green = *buf_p++;
-                                red = *buf_p++;
-                                alpha = *buf_p++;
-                                *pixbuf++ = red;
-                                *pixbuf++ = green;
-                                *pixbuf++ = blue;
-                                *pixbuf++ = alpha;
-                                break;
-                        default:
-                                ri.Error( ERR_DROP, "LoadBMP: illegal pixel_size '%d' in file '%s'\n", bmpHeader.bitsPerPixel, name );
-                                break;
-                        }
-                }
-        }
-
-        ri.FS_FreeFile( buffer );
-
-}
-
-
-/*
-=================================================================
-
-PCX LOADING
-
-=================================================================
-*/
-
-
-/*
-==============
-LoadPCX
-==============
-*/
-static void LoadPCX ( const char *filename, byte **pic, byte **palette, int *width, int *height)
-{
-        byte    *raw;
-        pcx_t   *pcx;
-        int             x, y;
-        int             len;
-        int             dataByte, runLength;
-        byte    *out, *pix;
-        unsigned                xmax, ymax;
-
-        *pic = NULL;
-        *palette = NULL;
-
-        //
-        // load the file
-        //
-        len = ri.FS_ReadFile( ( char * ) filename, (void **)&raw);
-        if (!raw) {
-                return;
-        }
-
-        //
-        // parse the PCX file
-        //
-        pcx = (pcx_t *)raw;
-        raw = &pcx->data;
-
-        xmax = LittleShort(pcx->xmax);
-    ymax = LittleShort(pcx->ymax);
-
-        if (pcx->manufacturer != 0x0a
-                || pcx->version != 5
-                || pcx->encoding != 1
-                || pcx->bits_per_pixel != 8
-                || xmax >= 1024
-                || ymax >= 1024)
-        {
-                ri.Printf (PRINT_ALL, "Bad pcx file %s (%i x %i) (%i x %i)\n", filename, xmax+1, ymax+1, pcx->xmax, pcx->ymax);
-                return;
-        }
-
-        out = ri.Malloc ( (ymax+1) * (xmax+1) );
-
-        *pic = out;
-
-        pix = out;
-
-        if (palette)
-        {
-                *palette = ri.Malloc(768);
-                Com_Memcpy (*palette, (byte *)pcx + len - 768, 768);
-        }
-
-        if (width)
-                *width = xmax+1;
-        if (height)
-                *height = ymax+1;
-// FIXME: use bytes_per_line here?
-
-        for (y=0 ; y<=ymax ; y++, pix += xmax+1)
-        {
-                for (x=0 ; x<=xmax ; )
-                {
-                        dataByte = *raw++;
-
-                        if((dataByte & 0xC0) == 0xC0)
-                        {
-                                runLength = dataByte & 0x3F;
-                                dataByte = *raw++;
-                        }
-                        else
-                                runLength = 1;
-
-                        while(runLength-- > 0)
-                                pix[x++] = dataByte;
-                }
-
-        }
-
-        if ( raw - (byte *)pcx > len)
-        {
-                ri.Printf (PRINT_DEVELOPER, "PCX file %s was malformed", filename);
-                ri.Free (*pic);
-                *pic = NULL;
-        }
-
-        ri.FS_FreeFile (pcx);
-}
-
-
-/*
-==============
-LoadPCX32
-==============
-*/
-static void LoadPCX32 ( const char *filename, byte **pic, int *width, int *height) {
-        byte    *palette;
-        byte    *pic8;
-        int             i, c, p;
-        byte    *pic32;
-
-        LoadPCX (filename, &pic8, &palette, width, height);
-        if (!pic8) {
-                *pic = NULL;
-                return;
-        }
-
-        // LoadPCX32 ensures width, height < 1024
-        c = (*width) * (*height);
-        pic32 = *pic = ri.Malloc(4 * c );
-        for (i = 0 ; i < c ; i++) {
-                p = pic8[i];
-                pic32[0] = palette[p*3];
-                pic32[1] = palette[p*3 + 1];
-                pic32[2] = palette[p*3 + 2];
-                pic32[3] = 255;
-                pic32 += 4;
-        }
-
-        ri.Free (pic8);
-        ri.Free (palette);
-}
-
-/*
-=========================================================
-
-TARGA LOADING
-
-=========================================================
-*/
-
-/*
-=============
-LoadTGA
-=============
-*/
-static void LoadTGA ( const char *name, byte **pic, int *width, int *height)
-{
-        unsigned        columns, rows, numPixels;
-        byte    *pixbuf;
-        int             row, column;
-        byte    *buf_p;
-        byte    *buffer;
-        TargaHeader     targa_header;
-        byte            *targa_rgba;
-
-        *pic = NULL;
-
-        //
-        // load the file
-        //
-        ri.FS_ReadFile ( ( char * ) name, (void **)&buffer);
-        if (!buffer) {
-                return;
-        }
-
-        buf_p = buffer;
-
-        targa_header.id_length = buf_p[0];
-        targa_header.colormap_type = buf_p[1];
-        targa_header.image_type = buf_p[2];
-        
-        memcpy(&targa_header.colormap_index, &buf_p[3], 2);
-        memcpy(&targa_header.colormap_length, &buf_p[5], 2);
-        targa_header.colormap_size = buf_p[7];
-        memcpy(&targa_header.x_origin, &buf_p[8], 2);
-        memcpy(&targa_header.y_origin, &buf_p[10], 2);
-        memcpy(&targa_header.width, &buf_p[12], 2);
-        memcpy(&targa_header.height, &buf_p[14], 2);
-        targa_header.pixel_size = buf_p[16];
-        targa_header.attributes = buf_p[17];
-
-        targa_header.colormap_index = LittleShort(targa_header.colormap_index);
-        targa_header.colormap_length = LittleShort(targa_header.colormap_length);
-        targa_header.x_origin = LittleShort(targa_header.x_origin);
-        targa_header.y_origin = LittleShort(targa_header.y_origin);
-        targa_header.width = LittleShort(targa_header.width);
-        targa_header.height = LittleShort(targa_header.height);
-
-        buf_p += 18;
-
-        if (targa_header.image_type!=2 
-                && targa_header.image_type!=10
-                && targa_header.image_type != 3 ) 
-        {
-                ri.Error (ERR_DROP, "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n");
-        }
-
-        if ( targa_header.colormap_type != 0 )
-        {
-                ri.Error( ERR_DROP, "LoadTGA: colormaps not supported\n" );
-        }
-
-        if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) && targa_header.image_type != 3 )
-        {
-                ri.Error (ERR_DROP, "LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
-        }
-
-        columns = targa_header.width;
-        rows = targa_header.height;
-        numPixels = columns * rows * 4;
-
-        if (width)
-                *width = columns;
-        if (height)
-                *height = rows;
-
-        if(!columns || !rows || numPixels > 0x7FFFFFFF || numPixels / columns / 4 != rows)
-        {
-                ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size\n", name);
-        }
-
-        targa_rgba = ri.Malloc (numPixels);
-        *pic = targa_rgba;
-
-        if (targa_header.id_length != 0)
-                buf_p += targa_header.id_length;  // skip TARGA image comment
-        
-        if ( targa_header.image_type==2 || targa_header.image_type == 3 )
-        { 
-                // Uncompressed RGB or gray scale image
-                for(row=rows-1; row>=0; row--) 
-                {
-                        pixbuf = targa_rgba + row*columns*4;
-                        for(column=0; column<columns; column++) 
-                        {
-                                unsigned char red,green,blue,alphabyte;
-                                switch (targa_header.pixel_size) 
-                                {
-                                        
-                                case 8:
-                                        blue = *buf_p++;
-                                        green = blue;
-                                        red = blue;
-                                        *pixbuf++ = red;
-                                        *pixbuf++ = green;
-                                        *pixbuf++ = blue;
-                                        *pixbuf++ = 255;
-                                        break;
-
-                                case 24:
-                                        blue = *buf_p++;
-                                        green = *buf_p++;
-                                        red = *buf_p++;
-                                        *pixbuf++ = red;
-                                        *pixbuf++ = green;
-                                        *pixbuf++ = blue;
-                                        *pixbuf++ = 255;
-                                        break;
-                                case 32:
-                                        blue = *buf_p++;
-                                        green = *buf_p++;
-                                        red = *buf_p++;
-                                        alphabyte = *buf_p++;
-                                        *pixbuf++ = red;
-                                        *pixbuf++ = green;
-                                        *pixbuf++ = blue;
-                                        *pixbuf++ = alphabyte;
-                                        break;
-                                default:
-                                        ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
-                                        break;
-                                }
-                        }
-                }
-        }
-        else if (targa_header.image_type==10) {   // Runlength encoded RGB images
-                unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
-
-                red = 0;
-                green = 0;
-                blue = 0;
-                alphabyte = 0xff;
-
-                for(row=rows-1; row>=0; row--) {
-                        pixbuf = targa_rgba + row*columns*4;
-                        for(column=0; column<columns; ) {
-                                packetHeader= *buf_p++;
-                                packetSize = 1 + (packetHeader & 0x7f);
-                                if (packetHeader & 0x80) {        // run-length packet
-                                        switch (targa_header.pixel_size) {
-                                                case 24:
-                                                                blue = *buf_p++;
-                                                                green = *buf_p++;
-                                                                red = *buf_p++;
-                                                                alphabyte = 255;
-                                                                break;
-                                                case 32:
-                                                                blue = *buf_p++;
-                                                                green = *buf_p++;
-                                                                red = *buf_p++;
-                                                                alphabyte = *buf_p++;
-                                                                break;
-                                                default:
-                                                        ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
-                                                        break;
-                                        }
-        
-                                        for(j=0;j<packetSize;j++) {
-                                                *pixbuf++=red;
-                                                *pixbuf++=green;
-                                                *pixbuf++=blue;
-                                                *pixbuf++=alphabyte;
-                                                column++;
-                                                if (column==columns) { // run spans across rows
-                                                        column=0;
-                                                        if (row>0)
-                                                                row--;
-                                                        else
-                                                                goto breakOut;
-                                                        pixbuf = targa_rgba + row*columns*4;
-                                                }
-                                        }
-                                }
-                                else {                            // non run-length packet
-                                        for(j=0;j<packetSize;j++) {
-                                                switch (targa_header.pixel_size) {
-                                                        case 24:
-                                                                        blue = *buf_p++;
-                                                                        green = *buf_p++;
-                                                                        red = *buf_p++;
-                                                                        *pixbuf++ = red;
-                                                                        *pixbuf++ = green;
-                                                                        *pixbuf++ = blue;
-                                                                        *pixbuf++ = 255;
-                                                                        break;
-                                                        case 32:
-                                                                        blue = *buf_p++;
-                                                                        green = *buf_p++;
-                                                                        red = *buf_p++;
-                                                                        alphabyte = *buf_p++;
-                                                                        *pixbuf++ = red;
-                                                                        *pixbuf++ = green;
-                                                                        *pixbuf++ = blue;
-                                                                        *pixbuf++ = alphabyte;
-                                                                        break;
-                                                        default:
-                                                                ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
-                                                                break;
-                                                }
-                                                column++;
-                                                if (column==columns) { // pixel packet run spans across rows
-                                                        column=0;
-                                                        if (row>0)
-                                                                row--;
-                                                        else
-                                                                goto breakOut;
-                                                        pixbuf = targa_rgba + row*columns*4;
-                                                }                                               
-                                        }
-                                }
-                        }
-                        breakOut:;
-                }
-        }
-
-#if 0 
-  // TTimo: this is the chunk of code to ensure a behavior that meets TGA specs 
-  // bit 5 set => top-down
-  if (targa_header.attributes & 0x20) {
-    unsigned char *flip = (unsigned char*)malloc (columns*4);
-    unsigned char *src, *dst;
-
-    for (row = 0; row < rows/2; row++) {
-      src = targa_rgba + row * 4 * columns;
-      dst = targa_rgba + (rows - row - 1) * 4 * columns;
-
-      memcpy (flip, src, columns*4);
-      memcpy (src, dst, columns*4);
-      memcpy (dst, flip, columns*4);
-    }
-    free (flip);
-  }
-#endif
-  // instead we just print a warning
-  if (targa_header.attributes & 0x20) {
-    ri.Printf( PRINT_WARNING, "WARNING: '%s' TGA file header declares top-down image, ignoring\n", name);
-  }
-
-  ri.FS_FreeFile (buffer);
-}
-
-static void LoadJPG( const char *filename, unsigned char **pic, int *width, int *height ) {
-  /* This struct contains the JPEG decompression parameters and pointers to
-   * working space (which is allocated as needed by the JPEG library).
-   */
-  struct jpeg_decompress_struct cinfo = {NULL};
-  /* We use our private extension JPEG error handler.
-   * Note that this struct must live as long as the main JPEG parameter
-   * struct, to avoid dangling-pointer problems.
-   */
-  /* This struct represents a JPEG error handler.  It is declared separately
-   * because applications often want to supply a specialized error handler
-   * (see the second half of this file for an example).  But here we just
-   * take the easy way out and use the standard error handler, which will
-   * print a message on stderr and call exit() if compression fails.
-   * Note that this struct must live as long as the main JPEG parameter
-   * struct, to avoid dangling-pointer problems.
-   */
-  struct jpeg_error_mgr jerr;
-  /* More stuff */
-  JSAMPARRAY buffer;            /* Output row buffer */
-  unsigned row_stride;          /* physical row width in output buffer */
-  unsigned pixelcount, memcount;
-  unsigned char *out;
-  byte  *fbuffer;
-  byte  *buf;
-
-  /* In this example we want to open the input file before doing anything else,
-   * so that the setjmp() error recovery below can assume the file is open.
-   * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
-   * requires it in order to read binary files.
-   */
-
-  ri.FS_ReadFile ( ( char * ) filename, (void **)&fbuffer);
-  if (!fbuffer) {
-        return;
-  }
-
-  /* Step 1: allocate and initialize JPEG decompression object */
-
-  /* We have to set up the error handler first, in case the initialization
-   * step fails.  (Unlikely, but it could happen if you are out of memory.)
-   * This routine fills in the contents of struct jerr, and returns jerr's
-   * address which we place into the link field in cinfo.
-   */
-  cinfo.err = jpeg_std_error(&jerr);
-
-  /* Now we can initialize the JPEG decompression object. */
-  jpeg_create_decompress(&cinfo);
-
-  /* Step 2: specify data source (eg, a file) */
-
-  jpeg_stdio_src(&cinfo, fbuffer);
-
-  /* Step 3: read file parameters with jpeg_read_header() */
-
-  (void) jpeg_read_header(&cinfo, TRUE);
-  /* We can ignore the return value from jpeg_read_header since
-   *   (a) suspension is not possible with the stdio data source, and
-   *   (b) we passed TRUE to reject a tables-only JPEG file as an error.
-   * See libjpeg.doc for more info.
-   */
-
-  /* Step 4: set parameters for decompression */
-
-  /* In this example, we don't need to change any of the defaults set by
-   * jpeg_read_header(), so we do nothing here.
-   */
-
-  /* Step 5: Start decompressor */
-
-  (void) jpeg_start_decompress(&cinfo);
-  /* We can ignore the return value since suspension is not possible
-   * with the stdio data source.
-   */
-
-  /* We may need to do some setup of our own at this point before reading
-   * the data.  After jpeg_start_decompress() we have the correct scaled
-   * output image dimensions available, as well as the output colormap
-   * if we asked for color quantization.
-   * In this example, we need to make an output work buffer of the right size.
-   */ 
-  /* JSAMPLEs per row in output buffer */
-
-  pixelcount = cinfo.output_width * cinfo.output_height;
-
-  if(!cinfo.output_width || !cinfo.output_height
-      || ((pixelcount * 4) / cinfo.output_width) / 4 != cinfo.output_height
-      || pixelcount > 0x1FFFFFFF || cinfo.output_components > 4) // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF
-  {
-    ri.Error (ERR_DROP, "LoadJPG: %s has an invalid image size: %dx%d*4=%d, components: %d\n", filename,
-                    cinfo.output_width, cinfo.output_height, pixelcount * 4, cinfo.output_components);
-  }
-
-  memcount = pixelcount * 4;
-  row_stride = cinfo.output_width * cinfo.output_components;
-
-  out = ri.Malloc(memcount);
-
-  *width = cinfo.output_width;
-  *height = cinfo.output_height;
-
-  /* Step 6: while (scan lines remain to be read) */
-  /*           jpeg_read_scanlines(...); */
-
-  /* Here we use the library's state variable cinfo.output_scanline as the
-   * loop counter, so that we don't have to keep track ourselves.
-   */
-  while (cinfo.output_scanline < cinfo.output_height) {
-    /* jpeg_read_scanlines expects an array of pointers to scanlines.
-     * Here the array is only one element long, but you could ask for
-     * more than one scanline at a time if that's more convenient.
-     */
-        buf = ((out+(row_stride*cinfo.output_scanline)));
-        buffer = &buf;
-    (void) jpeg_read_scanlines(&cinfo, buffer, 1);
-  }
-  
-  buf = out;
-
-  // If we are processing an 8-bit JPEG (greyscale), we'll have to convert
-  // the greyscale values to RGBA.
-  if(cinfo.output_components == 1)
-  {
-        int sindex = pixelcount, dindex = memcount;
-        unsigned char greyshade;
-
-        // Only pixelcount number of bytes have been written.
-        // Expand the color values over the rest of the buffer, starting
-        // from the end.
-        do
-        {
-                greyshade = buf[--sindex];
-
-                buf[--dindex] = 255;
-                buf[--dindex] = greyshade;
-                buf[--dindex] = greyshade;
-                buf[--dindex] = greyshade;
-        } while(sindex);
-  }
-  else
-  {
-        // clear all the alphas to 255
-        int     i;
-
-        for ( i = 3 ; i < memcount ; i+=4 )
-        {
-                buf[i] = 255;
-        }
-  }
-
-  *pic = out;
-
-  /* Step 7: Finish decompression */
-
-  (void) jpeg_finish_decompress(&cinfo);
-  /* We can ignore the return value since suspension is not possible
-   * with the stdio data source.
-   */
-
-  /* Step 8: Release JPEG decompression object */
-
-  /* This is an important step since it will release a good deal of memory. */
-  jpeg_destroy_decompress(&cinfo);
-
-  /* After finish_decompress, we can close the input file.
-   * Here we postpone it until after no more JPEG errors are possible,
-   * so as to simplify the setjmp error logic above.  (Actually, I don't
-   * think that jpeg_destroy can do an error exit, but why assume anything...)
-   */
-  ri.FS_FreeFile (fbuffer);
-
-  /* At this point you may want to check to see whether any corrupt-data
-   * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
-   */
-
-  /* And we're done! */
-}
-
-
-/* Expanded data destination object for stdio output */
-
-typedef struct {
-  struct jpeg_destination_mgr pub; /* public fields */
-
-  byte* outfile;                /* target stream */
-  int   size;
-} my_destination_mgr;
-
-typedef my_destination_mgr * my_dest_ptr;
-
-
-/*
- * Initialize destination --- called by jpeg_start_compress
- * before any data is actually written.
- */
-
-void init_destination (j_compress_ptr cinfo)
-{
-  my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-
-  dest->pub.next_output_byte = dest->outfile;
-  dest->pub.free_in_buffer = dest->size;
-}
-
-
-/*
- * Empty the output buffer --- called whenever buffer fills up.
- *
- * In typical applications, this should write the entire output buffer
- * (ignoring the current state of next_output_byte & free_in_buffer),
- * reset the pointer & count to the start of the buffer, and return TRUE
- * indicating that the buffer has been dumped.
- *
- * In applications that need to be able to suspend compression due to output
- * overrun, a FALSE return indicates that the buffer cannot be emptied now.
- * In this situation, the compressor will return to its caller (possibly with
- * an indication that it has not accepted all the supplied scanlines).  The
- * application should resume compression after it has made more room in the
- * output buffer.  Note that there are substantial restrictions on the use of
- * suspension --- see the documentation.
- *
- * When suspending, the compressor will back up to a convenient restart point
- * (typically the start of the current MCU). next_output_byte & free_in_buffer
- * indicate where the restart point will be if the current call returns FALSE.
- * Data beyond this point will be regenerated after resumption, so do not
- * write it out when emptying the buffer externally.
- */
-
-boolean empty_output_buffer (j_compress_ptr cinfo)
-{
-  return TRUE;
-}
-
-
-/*
- * Compression initialization.
- * Before calling this, all parameters and a data destination must be set up.
- *
- * We require a write_all_tables parameter as a failsafe check when writing
- * multiple datastreams from the same compression object.  Since prior runs
- * will have left all the tables marked sent_table=TRUE, a subsequent run
- * would emit an abbreviated stream (no tables) by default.  This may be what
- * is wanted, but for safety's sake it should not be the default behavior:
- * programmers should have to make a deliberate choice to emit abbreviated
- * images.  Therefore the documentation and examples should encourage people
- * to pass write_all_tables=TRUE; then it will take active thought to do the
- * wrong thing.
- */
-
-GLOBAL void
-jpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables)
-{
-  if (cinfo->global_state != CSTATE_START)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
-  if (write_all_tables)
-    jpeg_suppress_tables(cinfo, FALSE); /* mark all tables to be written */
-
-  /* (Re)initialize error mgr and destination modules */
-  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
-  (*cinfo->dest->init_destination) (cinfo);
-  /* Perform master selection of active modules */
-  jinit_compress_master(cinfo);
-  /* Set up for the first pass */
-  (*cinfo->master->prepare_for_pass) (cinfo);
-  /* Ready for application to drive first pass through jpeg_write_scanlines
-   * or jpeg_write_raw_data.
-   */
-  cinfo->next_scanline = 0;
-  cinfo->global_state = (cinfo->raw_data_in ? CSTATE_RAW_OK : CSTATE_SCANNING);
-}
-
-
-/*
- * Write some scanlines of data to the JPEG compressor.
- *
- * The return value will be the number of lines actually written.
- * This should be less than the supplied num_lines only in case that
- * the data destination module has requested suspension of the compressor,
- * or if more than image_height scanlines are passed in.
- *
- * Note: we warn about excess calls to jpeg_write_scanlines() since
- * this likely signals an application programmer error.  However,
- * excess scanlines passed in the last valid call are *silently* ignored,
- * so that the application need not adjust num_lines for end-of-image
- * when using a multiple-scanline buffer.
- */
-
-GLOBAL JDIMENSION
-jpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines,
-                      JDIMENSION num_lines)
-{
-  JDIMENSION row_ctr, rows_left;
-
-  if (cinfo->global_state != CSTATE_SCANNING)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-  if (cinfo->next_scanline >= cinfo->image_height)
-    WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
-
-  /* Call progress monitor hook if present */
-  if (cinfo->progress != NULL) {
-    cinfo->progress->pass_counter = (long) cinfo->next_scanline;
-    cinfo->progress->pass_limit = (long) cinfo->image_height;
-    (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
-  }
-
-  /* Give master control module another chance if this is first call to
-   * jpeg_write_scanlines.  This lets output of the frame/scan headers be
-   * delayed so that application can write COM, etc, markers between
-   * jpeg_start_compress and jpeg_write_scanlines.
-   */
-  if (cinfo->master->call_pass_startup)
-    (*cinfo->master->pass_startup) (cinfo);
-
-  /* Ignore any extra scanlines at bottom of image. */
-  rows_left = cinfo->image_height - cinfo->next_scanline;
-  if (num_lines > rows_left)
-    num_lines = rows_left;
-
-  row_ctr = 0;
-  (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, num_lines);
-  cinfo->next_scanline += row_ctr;
-  return row_ctr;
-}
-
-/*
- * Terminate destination --- called by jpeg_finish_compress
- * after all data has been written.  Usually needs to flush buffer.
- *
- * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
- * application must deal with any cleanup that should happen even
- * for error exit.
- */
-
-static int hackSize;
-
-void term_destination (j_compress_ptr cinfo)
-{
-  my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-  size_t datacount = dest->size - dest->pub.free_in_buffer;
-  hackSize = datacount;
-}
-
-
-/*
- * Prepare for output to a stdio stream.
- * The caller must have already opened the stream, and is responsible
- * for closing it after finishing compression.
- */
-
-void jpegDest (j_compress_ptr cinfo, byte* outfile, int size)
-{
-  my_dest_ptr dest;
-
-  /* The destination object is made permanent so that multiple JPEG images
-   * can be written to the same file without re-executing jpeg_stdio_dest.
-   * This makes it dangerous to use this manager and a different destination
-   * manager serially with the same JPEG object, because their private object
-   * sizes may be different.  Caveat programmer.
-   */
-  if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
-    cinfo->dest = (struct jpeg_destination_mgr *)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
-                                  sizeof(my_destination_mgr));
-  }
-
-  dest = (my_dest_ptr) cinfo->dest;
-  dest->pub.init_destination = init_destination;
-  dest->pub.empty_output_buffer = empty_output_buffer;
-  dest->pub.term_destination = term_destination;
-  dest->outfile = outfile;
-  dest->size = size;
-}
-
-void SaveJPG(char * filename, int quality, int image_width, int image_height, unsigned char *image_buffer) {
-  /* This struct contains the JPEG compression parameters and pointers to
-   * working space (which is allocated as needed by the JPEG library).
-   * It is possible to have several such structures, representing multiple
-   * compression/decompression processes, in existence at once.  We refer
-   * to any one struct (and its associated working data) as a "JPEG object".
-   */
-  struct jpeg_compress_struct cinfo;
-  /* This struct represents a JPEG error handler.  It is declared separately
-   * because applications often want to supply a specialized error handler
-   * (see the second half of this file for an example).  But here we just
-   * take the easy way out and use the standard error handler, which will
-   * print a message on stderr and call exit() if compression fails.
-   * Note that this struct must live as long as the main JPEG parameter
-   * struct, to avoid dangling-pointer problems.
-   */
-  struct jpeg_error_mgr jerr;
-  /* More stuff */
-  JSAMPROW row_pointer[1];      /* pointer to JSAMPLE row[s] */
-  int row_stride;               /* physical row width in image buffer */
-  unsigned char *out;
-
-  /* Step 1: allocate and initialize JPEG compression object */
-
-  /* We have to set up the error handler first, in case the initialization
-   * step fails.  (Unlikely, but it could happen if you are out of memory.)
-   * This routine fills in the contents of struct jerr, and returns jerr's
-   * address which we place into the link field in cinfo.
-   */
-  cinfo.err = jpeg_std_error(&jerr);
-  /* Now we can initialize the JPEG compression object. */
-  jpeg_create_compress(&cinfo);
-
-  /* Step 2: specify data destination (eg, a file) */
-  /* Note: steps 2 and 3 can be done in either order. */
-
-  /* Here we use the library-supplied code to send compressed data to a
-   * stdio stream.  You can also write your own code to do something else.
-   * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
-   * requires it in order to write binary files.
-   */
-  out = ri.Hunk_AllocateTempMemory(image_width*image_height*4);
-  jpegDest(&cinfo, out, image_width*image_height*4);
-
-  /* Step 3: set parameters for compression */
-
-  /* First we supply a description of the input image.
-   * Four fields of the cinfo struct must be filled in:
-   */
-  cinfo.image_width = image_width;      /* image width and height, in pixels */
-  cinfo.image_height = image_height;
-  cinfo.input_components = 4;           /* # of color components per pixel */
-  cinfo.in_color_space = JCS_RGB;       /* colorspace of input image */
-  /* Now use the library's routine to set default compression parameters.
-   * (You must set at least cinfo.in_color_space before calling this,
-   * since the defaults depend on the source color space.)
-   */
-  jpeg_set_defaults(&cinfo);
-  /* Now you can set any non-default parameters you wish to.
-   * Here we just illustrate the use of quality (quantization table) scaling:
-   */
-  jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
-  /* If quality is set high, disable chroma subsampling */
-  if (quality >= 85) {
-    cinfo.comp_info[0].h_samp_factor = 1;
-    cinfo.comp_info[0].v_samp_factor = 1;
-  }
-
-  /* Step 4: Start compressor */
-
-  /* TRUE ensures that we will write a complete interchange-JPEG file.
-   * Pass TRUE unless you are very sure of what you're doing.
-   */
-  jpeg_start_compress(&cinfo, TRUE);
-
-  /* Step 5: while (scan lines remain to be written) */
-  /*           jpeg_write_scanlines(...); */
-
-  /* Here we use the library's state variable cinfo.next_scanline as the
-   * loop counter, so that we don't have to keep track ourselves.
-   * To keep things simple, we pass one scanline per call; you can pass
-   * more if you wish, though.
-   */
-  row_stride = image_width * 4; /* JSAMPLEs per row in image_buffer */
-
-  while (cinfo.next_scanline < cinfo.image_height) {
-    /* jpeg_write_scanlines expects an array of pointers to scanlines.
-     * Here the array is only one element long, but you could pass
-     * more than one scanline at a time if that's more convenient.
-     */
-    row_pointer[0] = & image_buffer[((cinfo.image_height-1)*row_stride)-cinfo.next_scanline * row_stride];
-    (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
-  }
-
-  /* Step 6: Finish compression */
-
-  jpeg_finish_compress(&cinfo);
-  /* After finish_compress, we can close the output file. */
-  ri.FS_WriteFile( filename, out, hackSize );
-
-  ri.Hunk_FreeTempMemory(out);
-
-  /* Step 7: release JPEG compression object */
-
-  /* This is an important step since it will release a good deal of memory. */
-  jpeg_destroy_compress(&cinfo);
-
-  /* And we're done! */
-}
-
-/*
-=================
-SaveJPGToBuffer
-=================
-*/
-int SaveJPGToBuffer( byte *buffer, int quality,
-    int image_width, int image_height,
-    byte *image_buffer )
-{
-  struct jpeg_compress_struct cinfo;
-  struct jpeg_error_mgr jerr;
-  JSAMPROW row_pointer[1];      /* pointer to JSAMPLE row[s] */
-  int row_stride;               /* physical row width in image buffer */
-
-  /* Step 1: allocate and initialize JPEG compression object */
-  cinfo.err = jpeg_std_error(&jerr);
-  /* Now we can initialize the JPEG compression object. */
-  jpeg_create_compress(&cinfo);
-
-  /* Step 2: specify data destination (eg, a file) */
-  /* Note: steps 2 and 3 can be done in either order. */
-  jpegDest(&cinfo, buffer, image_width*image_height*4);
-
-  /* Step 3: set parameters for compression */
-  cinfo.image_width = image_width;      /* image width and height, in pixels */
-  cinfo.image_height = image_height;
-  cinfo.input_components = 4;           /* # of color components per pixel */
-  cinfo.in_color_space = JCS_RGB;       /* colorspace of input image */
-
-  jpeg_set_defaults(&cinfo);
-  jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
-  /* If quality is set high, disable chroma subsampling */
-  if (quality >= 85) {
-    cinfo.comp_info[0].h_samp_factor = 1;
-    cinfo.comp_info[0].v_samp_factor = 1;
-  }
-
-  /* Step 4: Start compressor */
-  jpeg_start_compress(&cinfo, TRUE);
-
-  /* Step 5: while (scan lines remain to be written) */
-  /*           jpeg_write_scanlines(...); */
-  row_stride = image_width * 4; /* JSAMPLEs per row in image_buffer */
-
-  while (cinfo.next_scanline < cinfo.image_height) {
-    /* jpeg_write_scanlines expects an array of pointers to scanlines.
-     * Here the array is only one element long, but you could pass
-     * more than one scanline at a time if that's more convenient.
-     */
-    row_pointer[0] = & image_buffer[((cinfo.image_height-1)*row_stride)-cinfo.next_scanline * row_stride];
-    (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
-  }
-
-  /* Step 6: Finish compression */
-  jpeg_finish_compress(&cinfo);
-
-  /* Step 7: release JPEG compression object */
-  jpeg_destroy_compress(&cinfo);
-
-  /* And we're done! */
-  return hackSize;
-}
-
-//===================================================================
-
-/*
-=================
-PNG LOADING
-=================
-*/
-
-/*
- *  Quake 3 image format : RGBA
- */
-
-#define Q3IMAGE_BYTESPERPIXEL (4)
-
-/*
- *  PNG specifications
- */
-
-/*
- *  The first 8 Bytes of every PNG-File are a fixed signature
- *  to identify the file as a PNG.
- */
-
-#define PNG_Signature "\x89\x50\x4E\x47\xD\xA\x1A\xA"
-#define PNG_Signature_Size (8)
-
-/*
- *  After the signature diverse chunks follow.
- *  A chunk consists of a header and if Length
- *  is bigger than 0 a body and a CRC of the body follow.
- */
-
-struct PNG_ChunkHeader
-{
-    uint32_t Length;
-    uint32_t Type;
-};
-
-#define PNG_ChunkHeader_Size (8)
-
-typedef uint32_t PNG_ChunkCRC;
-
-#define PNG_ChunkCRC_Size (4)
-
-/*
- *  We use the following ChunkTypes.
- *  All others are ignored.
- */
-
-#define MAKE_CHUNKTYPE(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | ((d)))
-
-#define PNG_ChunkType_IHDR MAKE_CHUNKTYPE('I', 'H', 'D', 'R')
-#define PNG_ChunkType_PLTE MAKE_CHUNKTYPE('P', 'L', 'T', 'E')
-#define PNG_ChunkType_IDAT MAKE_CHUNKTYPE('I', 'D', 'A', 'T')
-#define PNG_ChunkType_IEND MAKE_CHUNKTYPE('I', 'E', 'N', 'D')
-#define PNG_ChunkType_tRNS MAKE_CHUNKTYPE('t', 'R', 'N', 'S')
-
-/*
- *  Per specification the first chunk after the signature SHALL be IHDR.
- */
-
-struct PNG_Chunk_IHDR
-{
-    uint32_t Width;
-    uint32_t Height;
-    uint8_t  BitDepth;
-    uint8_t  ColourType;
-    uint8_t  CompressionMethod;
-    uint8_t  FilterMethod;
-    uint8_t  InterlaceMethod;
-};
-
-#define PNG_Chunk_IHDR_Size (13)
-
-/*
- *  ColourTypes
- */
-
-#define PNG_ColourType_Grey      (0)
-#define PNG_ColourType_True      (2)
-#define PNG_ColourType_Indexed   (3)
-#define PNG_ColourType_GreyAlpha (4)
-#define PNG_ColourType_TrueAlpha (6)
-
-/*
- *  number of colour components
- *
- *  Grey      : 1 grey
- *  True      : 1 R, 1 G, 1 B
- *  Indexed   : 1 index
- *  GreyAlpha : 1 grey, 1 alpha
- *  TrueAlpha : 1 R, 1 G, 1 B, 1 alpha
- */
-
-#define PNG_NumColourComponents_Grey      (1)
-#define PNG_NumColourComponents_True      (3)
-#define PNG_NumColourComponents_Indexed   (1)
-#define PNG_NumColourComponents_GreyAlpha (2)
-#define PNG_NumColourComponents_TrueAlpha (4)
-
-/*
- *  For the different ColourTypes
- *  different BitDepths are specified.
- */
-
-#define PNG_BitDepth_1  ( 1)
-#define PNG_BitDepth_2  ( 2)
-#define PNG_BitDepth_4  ( 4)
-#define PNG_BitDepth_8  ( 8)
-#define PNG_BitDepth_16 (16)
-
-/*
- *  Only one valid CompressionMethod is standardized.
- */
-
-#define PNG_CompressionMethod_0 (0)
-
-/*
- *  Only one valid FilterMethod is currently standardized.
- */
-
-#define PNG_FilterMethod_0 (0)
-
-/*
- *  This FilterMethod defines 5 FilterTypes
- */
-
-#define PNG_FilterType_None    (0)
-#define PNG_FilterType_Sub     (1)
-#define PNG_FilterType_Up      (2)
-#define PNG_FilterType_Average (3)
-#define PNG_FilterType_Paeth   (4)
-
-/*
- *  Two InterlaceMethods are standardized :
- *  0 - NonInterlaced
- *  1 - Interlaced
- */
-
-#define PNG_InterlaceMethod_NonInterlaced (0)
-#define PNG_InterlaceMethod_Interlaced    (1)
-
-/*
- *  The Adam7 interlace method uses 7 passes.
- */
-
-#define PNG_Adam7_NumPasses (7)
-
-/*
- *  The compressed data starts with a header ...
- */
-
-struct PNG_ZlibHeader
-{
-    uint8_t CompressionMethod;
-    uint8_t Flags;
-};
-
-#define PNG_ZlibHeader_Size (2)
-
-/*
- *  ... and is followed by a check value
- */
-
-#define PNG_ZlibCheckValue_Size (4)
-
-/*
- *  Some support functions for buffered files follow.
- */
-
-/*
- *  buffered file representation
- */
-
-struct BufferedFile
-{
-    byte *Buffer;
-    int   Length;
-    byte *Ptr;
-    int   BytesLeft;
-};
-
-/*
- *  Read a file into a buffer.
- */
-
-static struct BufferedFile *ReadBufferedFile(const char *name)
-{
-    struct BufferedFile *BF;
-
-    /*
-     *  input verification
-     */
-
-    if(!name)
-    {
-        return(NULL);
-    }
-
-    /*
-     *  Allocate control struct.
-     */
-
-    BF = ri.Malloc(sizeof(struct BufferedFile));
-    if(!BF)
-    {
-        return(NULL);
-    }
-
-    /*
-     *  Initialize the structs components.
-     */
-
-    BF->Length    = 0;
-    BF->Buffer    = NULL;
-    BF->Ptr       = NULL;
-    BF->BytesLeft = 0;
-
-    /*
-     *  Read the file.
-     */
-
-    BF->Length = ri.FS_ReadFile((char *) name, (void **) &BF->Buffer);
-
-    /*
-     *  Did we get it? Is it big enough?
-     */
-
-    if(!(BF->Buffer && (BF->Length > 0)))
-    {
-        ri.Free(BF);
-
-        return(NULL);
-    }
-
-    /*
-     *  Set the pointers and counters.
-     */
-
-    BF->Ptr       = BF->Buffer;
-    BF->BytesLeft = BF->Length;
-
-    return(BF);
-}
-
-/*
- *  Close a buffered file.
- */
-
-static void CloseBufferedFile(struct BufferedFile *BF)
-{
-    if(BF)
-    {
-        if(BF->Buffer)
-        {
-            ri.FS_FreeFile(BF->Buffer);
-        }
- 
-        ri.Free(BF);
-    }
-}
-
-/*
- *  Get a pointer to the requested bytes.
- */
-
-static void *BufferedFileRead(struct BufferedFile *BF, int Length)
-{
-    void *RetVal;
-
-    /*
-     *  input verification
-     */
-
-    if(!(BF && Length))
-    {
-        return(NULL);
-    }
- 
-    /*
-     *  not enough bytes left
-     */
-
-    if(Length > BF->BytesLeft)
-    {
-        return(NULL);
-    }
-
-    /*
-     *  the pointer to the requested data
-     */
-
-    RetVal = BF->Ptr;
- 
-    /*
-     *  Raise the pointer and counter.
-     */
-
-    BF->Ptr       += Length;
-    BF->BytesLeft -= Length;
-
-    return(RetVal);
-}
-
-/*
- *  Rewind the buffer.
- */
-
-static qboolean BufferedFileRewind(struct BufferedFile *BF, int Offset)
-{
-    int BytesRead; 
-
-    /*
-     *  input verification
-     */
-
-    if(!BF)
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  special trick to rewind to the beginning of the buffer
-     */
-
-    if(Offset == -1)
-    {
-        BF->Ptr       = BF->Buffer;
-        BF->BytesLeft = BF->Length;
-  
-        return(qtrue);
-    }
-
-    /*
-     *  How many bytes do we have already read?
-     */
-
-    BytesRead = BF->Ptr - BF->Buffer;
-
-    /*
-     *  We can only rewind to the beginning of the BufferedFile.
-     */
-
-    if(Offset > BytesRead)
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  lower the pointer and counter.
-     */
-
-    BF->Ptr       -= Offset;
-    BF->BytesLeft += Offset;
-
-    return(qtrue);
-}
-
-/*
- *  Skip some bytes.
- */
-
-static qboolean BufferedFileSkip(struct BufferedFile *BF, int Offset)
-{
-    /*
-     *  input verification
-     */
-
-    if(!BF)
-    {
-        return(qfalse);
-    }
- 
-    /*
-     *  We can only skip to the end of the BufferedFile.
-     */
-
-    if(Offset > BF->BytesLeft)
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  lower the pointer and counter.
-     */
-
-    BF->Ptr       += Offset;
-    BF->BytesLeft -= Offset;
-
-    return(qtrue);
-}
-
-/*
- *  Find a chunk
- */
-
-static qboolean FindChunk(struct BufferedFile *BF, uint32_t ChunkType)
-{
-    struct PNG_ChunkHeader *CH;
-
-    uint32_t Length;
-    uint32_t Type;
-
-    /*
-     *  input verification
-     */
-
-    if(!BF)
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  cycle trough the chunks
-     */
-
-    while(qtrue)
-    {
-        /*
-         *  Read the chunk-header.
-         */
-
-        CH = BufferedFileRead(BF, PNG_ChunkHeader_Size);
-        if(!CH)
-        {
-            return(qfalse);
-        }
-
-        /*
-         *  Do not swap the original types
-         *  they might be needed later.
-         */
-
-        Length = BigLong(CH->Length);
-        Type   = BigLong(CH->Type);
-  
-        /*
-         *  We found it!
-         */
-
-        if(Type == ChunkType)
-        {
-            /*
-             *  Rewind to the start of the chunk.
-             */
-             
-            BufferedFileRewind(BF, PNG_ChunkHeader_Size);
-  
-            break;
-        }
-        else
-        {
-            /*
-             *  Skip the rest of the chunk.
-             */
-
-            if(Length)
-            {
-                if(!BufferedFileSkip(BF, Length + PNG_ChunkCRC_Size))
-                {
-                    return(qfalse);
-                }  
-            }
-        }
-    }
-
-    return(qtrue);
-}
-
-/*
- *  Decompress all IDATs
- */
-
-static uint32_t DecompressIDATs(struct BufferedFile *BF, uint8_t **Buffer)
-{
-    uint8_t  *DecompressedData;
-    uint32_t  DecompressedDataLength;
-
-    uint8_t  *CompressedData;
-    uint8_t  *CompressedDataPtr;
-    uint32_t  CompressedDataLength;
-
-    struct PNG_ChunkHeader *CH;
-
-    uint32_t Length;
-    uint32_t Type;
-
-    int BytesToRewind;
-
-    int32_t   puffResult;
-    uint8_t  *puffDest;
-    uint32_t  puffDestLen;
-    uint8_t  *puffSrc;
-    uint32_t  puffSrcLen;
-
-    /*
-     *  input verification
-     */
-
-    if(!(BF && Buffer))
-    {
-        return(-1);
-    }
-
-    /*
-     *  some zeroing
-     */
-
-    DecompressedData = NULL;
-    DecompressedDataLength = 0;
-    *Buffer = DecompressedData;
-
-    CompressedData = NULL;
-    CompressedDataLength = 0;
-
-    BytesToRewind = 0;
-
-    /*
-     *  Find the first IDAT chunk.
-     */
-
-    if(!FindChunk(BF, PNG_ChunkType_IDAT))
-    {
-        return(-1);
-    }
-
-    /*
-     *  Count the size of the uncompressed data
-     */
-
-    while(qtrue)
-    {
-        /*
-         *  Read chunk header
-         */
-
-        CH = BufferedFileRead(BF, PNG_ChunkHeader_Size);
-        if(!CH)
-        {
-            /*
-             *  Rewind to the start of this adventure
-             *  and return unsuccessfull
-             */
-
-            BufferedFileRewind(BF, BytesToRewind);
-
-            return(-1);
-        }
-
-        /*
-         *  Length and Type of chunk
-         */
-
-        Length = BigLong(CH->Length);
-        Type   = BigLong(CH->Type);
-
-        /*
-         *  We have reached the end of the IDAT chunks
-         */
-
-        if(!(Type == PNG_ChunkType_IDAT))
-        {
-            BufferedFileRewind(BF, PNG_ChunkHeader_Size); 
-  
-            break;
-        }
-
-        /*
-         *  Add chunk header to count.
-         */
-
-        BytesToRewind += PNG_ChunkHeader_Size;
-
-        /*
-         *  Skip to next chunk
-         */
-
-        if(Length)
-        {
-            if(!BufferedFileSkip(BF, Length + PNG_ChunkCRC_Size))
-            {
-                BufferedFileRewind(BF, BytesToRewind);
-
-                return(-1);
-            }
-
-            BytesToRewind += Length + PNG_ChunkCRC_Size;
-            CompressedDataLength += Length;
-        } 
-    }
-
-    BufferedFileRewind(BF, BytesToRewind);
-
-    CompressedData = ri.Malloc(CompressedDataLength);
-    if(!CompressedData)
-    {
-        return(-1);
-    }
- 
-    CompressedDataPtr = CompressedData;
-
-    /*
-     *  Collect the compressed Data
-     */
-
-    while(qtrue)
-    {
-        /*
-         *  Read chunk header
-         */
-
-        CH = BufferedFileRead(BF, PNG_ChunkHeader_Size);
-        if(!CH)
-        {
-            ri.Free(CompressedData); 
-  
-            return(-1);
-        }
-
-        /*
-         *  Length and Type of chunk
-         */
-
-        Length = BigLong(CH->Length);
-        Type   = BigLong(CH->Type);
-
-        /*
-         *  We have reached the end of the IDAT chunks
-         */
-
-        if(!(Type == PNG_ChunkType_IDAT))
-        {
-            BufferedFileRewind(BF, PNG_ChunkHeader_Size); 
-  
-            break;
-        }
-
-        /*
-         *  Copy the Data
-         */
-
-        if(Length)
-        {
-            uint8_t *OrigCompressedData;
-   
-            OrigCompressedData = BufferedFileRead(BF, Length);
-            if(!OrigCompressedData)
-            {
-                ri.Free(CompressedData); 
-  
-                return(-1);
-            }
-
-            if(!BufferedFileSkip(BF, PNG_ChunkCRC_Size))
-            {
-                ri.Free(CompressedData); 
-
-                return(-1);
-            }
-  
-            memcpy(CompressedDataPtr, OrigCompressedData, Length);
-            CompressedDataPtr += Length;
-        } 
-    }
-
-    /*
-     *  Let puff() calculate the decompressed data length.
-     */
-
-    puffDest    = NULL;
-    puffDestLen = 0;
- 
-    /*
-     *  The zlib header and checkvalue don't belong to the compressed data.
-     */
-
-    puffSrc    = CompressedData + PNG_ZlibHeader_Size;
-    puffSrcLen = CompressedDataLength - PNG_ZlibHeader_Size - PNG_ZlibCheckValue_Size;
-
-    /*
-     *  first puff() to calculate the size of the uncompressed data
-     */
-
-    puffResult = puff(puffDest, &puffDestLen, puffSrc, &puffSrcLen);
-    if(!((puffResult == 0) && (puffDestLen > 0)))
-    {
-        ri.Free(CompressedData);
- 
-        return(-1);
-    }
-
-    /*
-     *  Allocate the buffer for the uncompressed data.
-     */
-
-    DecompressedData = ri.Malloc(puffDestLen);
-    if(!DecompressedData)
-    {
-        ri.Free(CompressedData);
- 
-        return(-1);
-    }
-
-    /*
-     *  Set the input again in case something was changed by the last puff() .
-     */
-
-    puffDest   = DecompressedData;
-    puffSrc    = CompressedData + PNG_ZlibHeader_Size;
-    puffSrcLen = CompressedDataLength - PNG_ZlibHeader_Size - PNG_ZlibCheckValue_Size;
- 
-    /*
-     *  decompression puff()
-     */
-
-    puffResult = puff(puffDest, &puffDestLen, puffSrc, &puffSrcLen);
-
-    /*
-     *  The compressed data is not needed anymore.
-     */
-
-    ri.Free(CompressedData);
-
-    /*
-     *  Check if the last puff() was successfull.
-     */
-
-    if(!((puffResult == 0) && (puffDestLen > 0)))
-    {
-        ri.Free(DecompressedData);
- 
-        return(-1);
-    }
-
-    /*
-     *  Set the output of this function.
-     */
-
-    DecompressedDataLength = puffDestLen;
-    *Buffer = DecompressedData;
-
-    return(DecompressedDataLength);
-}
-
-/*
- *  the Paeth predictor
- */
-
-static uint8_t PredictPaeth(uint8_t a, uint8_t b, uint8_t c)
-{
-    /*
-     *  a == Left
-     *  b == Up
-     *  c == UpLeft
-     */
-
-    uint8_t Pr;
-    int p;
-    int pa, pb, pc;
-
-    Pr = 0;
-
-    p  = ((int) a) + ((int) b) - ((int) c);
-    pa = abs(p - ((int) a));
-    pb = abs(p - ((int) b));
-    pc = abs(p - ((int) c));
-
-    if((pa <= pb) && (pa <= pc))
-    {
-        Pr = a;
-    }
-    else if(pb <= pc)
-    {
-        Pr = b;
-    }
-    else
-    {
-        Pr = c;
-    }
-
-    return(Pr);
-
-}
-
-/*
- *  Reverse the filters.
- */
-
-static qboolean UnfilterImage(uint8_t  *DecompressedData, 
-                              uint32_t  ImageHeight,
-                              uint32_t  BytesPerScanline, 
-                              uint32_t  BytesPerPixel)
-{
-    uint8_t   *DecompPtr;
-    uint8_t   FilterType;
-    uint8_t  *PixelLeft, *PixelUp, *PixelUpLeft;
-    uint32_t  w, h, p;
-
-    /*
-     *  some zeros for the filters
-     */
-
-    uint8_t Zeros[8] = {0, 0, 0, 0, 0, 0, 0, 0};
-
-    /*
-     *  input verification
-     *
-     *  ImageHeight and BytesPerScanline are not checked,
-     *  because these can be zero in some interlace passes.
-     */
-
-    if(!(DecompressedData && BytesPerPixel))
-    {
-        return(qfalse);
-    }
-
-
-    /*
-     *  Set the pointer to the start of the decompressed Data.
-     */
-
-    DecompPtr = DecompressedData;
-
-    /*
-     *  Un-filtering is done in place.
-     */
-
-    /*
-     *  Go trough all scanlines.
-     */
-
-    for(h = 0; h < ImageHeight; h++)
-    {
-        /*
-         *  Every scanline starts with a FilterType byte.
-         */
-
-        FilterType = *DecompPtr;
-        DecompPtr++;
-
-        /*
-         *  Left pixel of the first byte in a scanline is zero.
-         */
-
-        PixelLeft = Zeros;
-
-        /*
-         *  Set PixelUp to previous line only if we are on the second line or above.
-         *
-         *  Plus one byte for the FilterType
-         */
-
-        if(h > 0)
-        {
-            PixelUp = DecompPtr - (BytesPerScanline + 1);
-        }
-        else
-        {
-            PixelUp = Zeros;
-        }
-
-        /*
-         * The pixel left to the first pixel of the previous scanline is zero too.
-         */
-
-        PixelUpLeft = Zeros;
-
-        /*
-         *  Cycle trough all pixels of the scanline.
-         */
-
-        for(w = 0; w < (BytesPerScanline / BytesPerPixel); w++)
-        {
-            /*
-             *  Cycle trough the bytes of the pixel.
-             */
-
-            for(p = 0; p < BytesPerPixel; p++)
-            {
-                switch(FilterType)
-                { 
-                    case PNG_FilterType_None :
-                    {
-                        /*
-                         *  The byte is unfiltered.
-                         */
-
-                        break;
-                    }
-
-                    case PNG_FilterType_Sub :
-                    {
-                        DecompPtr[p] += PixelLeft[p];
-
-                        break;
-                    }
-
-                    case PNG_FilterType_Up :
-                    {
-                        DecompPtr[p] += PixelUp[p];
-
-                        break;
-                    }
-
-                    case PNG_FilterType_Average :
-                    {
-                        DecompPtr[p] += ((uint8_t) ((((uint16_t) PixelLeft[p]) + ((uint16_t) PixelUp[p])) / 2));
-
-                        break;
-                    }
-
-                    case PNG_FilterType_Paeth :
-                    {
-                        DecompPtr[p] += PredictPaeth(PixelLeft[p], PixelUp[p], PixelUpLeft[p]);
-
-                        break;
-                    }
-
-                    default :
-                    {
-                        return(qfalse);
-                    }
-                }
-            }
-   
-            PixelLeft = DecompPtr;
-
-            /*
-             *  We only have a upleft pixel if we are on the second line or above.
-             */
-
-            if(h > 0)
-            {
-                PixelUpLeft = DecompPtr - (BytesPerScanline + 1);
-            }
-
-            /*
-             *  Skip to the next pixel.
-             */
-
-            DecompPtr += BytesPerPixel;
-         
-            /*
-             *  We only have a previous line if we are on the second line and above.
-             */
-
-            if(h > 0)
-            {
-                PixelUp = DecompPtr - (BytesPerScanline + 1);
-            }
-        }
-    }
-
- return(qtrue);
-}
-
-/*
- *  Convert a raw input pixel to Quake 3 RGA format.
- */
-
-static qboolean ConvertPixel(struct PNG_Chunk_IHDR *IHDR,
-                             byte                  *OutPtr,
-                             uint8_t               *DecompPtr,
-                             qboolean               HasTransparentColour,
-                             uint8_t               *TransparentColour,
-                             uint8_t               *OutPal)
-{
-    /*
-     *  input verification
-     */
-    
-    if(!(IHDR && OutPtr && DecompPtr && TransparentColour && OutPal))
-    {
-     return(qfalse);
-    }
-
-    switch(IHDR->ColourType)
-    {
-        case PNG_ColourType_Grey :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_1 :
-                case PNG_BitDepth_2 :
-                case PNG_BitDepth_4 :
-                {
-                    uint8_t Step;
-                    uint8_t GreyValue;
-
-                    Step = 0xFF / ((1 << IHDR->BitDepth) - 1);
-
-                    GreyValue = DecompPtr[0] * Step;
-  
-                    OutPtr[0] = GreyValue;
-                    OutPtr[1] = GreyValue;
-                    OutPtr[2] = GreyValue;
-                    OutPtr[3] = 0xFF;
-
-                    /*
-                     *  Grey supports full transparency for one specified colour
-                     */
-
-                    if(HasTransparentColour)
-                    {
-                        if(TransparentColour[1] == DecompPtr[0])
-                        {
-                            OutPtr[3] = 0x00;
-                        }
-                    }
-        
-
-                    break;
-                }
-      
-                case PNG_BitDepth_8 :
-                case PNG_BitDepth_16 :
-                {
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[0];
-                    OutPtr[2] = DecompPtr[0];
-                    OutPtr[3] = 0xFF;
-      
-                    /*
-                     *  Grey supports full transparency for one specified colour
-                     */
-
-                    if(HasTransparentColour)
-                    {
-                        if(IHDR->BitDepth == PNG_BitDepth_8)
-                        {
-                            if(TransparentColour[1] == DecompPtr[0])
-                            {
-                                OutPtr[3] = 0x00;
-                            }
-                        }
-                        else
-                        {
-                            if((TransparentColour[0] == DecompPtr[0]) && (TransparentColour[1] == DecompPtr[1]))
-                            {
-                                OutPtr[3] = 0x00;
-                            }
-                        }
-                    }
-
-                    break;
-                }
-      
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-    
-            break;
-        }
-
-        case PNG_ColourType_True :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                {
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[1];
-                    OutPtr[2] = DecompPtr[2];
-                    OutPtr[3] = 0xFF;
-      
-                    /*
-                     *  True supports full transparency for one specified colour
-                     */
-
-                    if(HasTransparentColour)
-                    {
-                        if((TransparentColour[1] == DecompPtr[0]) &&
-                           (TransparentColour[3] == DecompPtr[1]) &&
-                           (TransparentColour[5] == DecompPtr[3]))
-                        {
-                            OutPtr[3] = 0x00;
-                        }
-                    }
-
-                    break;
-                }
-      
-                case PNG_BitDepth_16 :
-                {
-                    /*
-                     *  We use only the upper byte.
-                     */
-
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[2];
-                    OutPtr[2] = DecompPtr[4];
-                    OutPtr[3] = 0xFF;
-      
-                    /*
-                     *  True supports full transparency for one specified colour
-                     */
-
-                    if(HasTransparentColour)
-                    {
-                        if((TransparentColour[0] == DecompPtr[0]) && (TransparentColour[1] == DecompPtr[1]) &&
-                           (TransparentColour[2] == DecompPtr[2]) && (TransparentColour[3] == DecompPtr[3]) &&
-                           (TransparentColour[4] == DecompPtr[4]) && (TransparentColour[5] == DecompPtr[5]))
-                        {
-                            OutPtr[3] = 0x00;
-                        }
-                    }
-
-                    break;
-                }
-
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-
-            break;
-        }
-
-        case PNG_ColourType_Indexed :
-        {
-            OutPtr[0] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 0];
-            OutPtr[1] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 1];
-            OutPtr[2] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 2];
-            OutPtr[3] = OutPal[DecompPtr[0] * Q3IMAGE_BYTESPERPIXEL + 3];
-        
-            break;
-        }
-
-        case PNG_ColourType_GreyAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                {
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[0];
-                    OutPtr[2] = DecompPtr[0];
-                    OutPtr[3] = DecompPtr[1];
-      
-                    break;
-                }
-  
-                case PNG_BitDepth_16 :
-                {
-                    /*
-                     *  We use only the upper byte.
-                     */
-
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[0];
-                    OutPtr[2] = DecompPtr[0];
-                    OutPtr[3] = DecompPtr[2];
-      
-                    break;
-                }
-
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-
-            break;
-        }
-
-        case PNG_ColourType_TrueAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                {
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[1];
-                    OutPtr[2] = DecompPtr[2];
-                    OutPtr[3] = DecompPtr[3];
-      
-                    break;
-                }
-      
-                case PNG_BitDepth_16 :
-                {
-                    /*
-                     *  We use only the upper byte.
-                     */
-
-                    OutPtr[0] = DecompPtr[0];
-                    OutPtr[1] = DecompPtr[2];
-                    OutPtr[2] = DecompPtr[4];
-                    OutPtr[3] = DecompPtr[6];
-      
-                    break;
-                }
-
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-
-            break;
-        }
-
-        default :
-        {
-            return(qfalse);
-        }
-    }
-
-    return(qtrue);
-}
-
-
-/*
- *  Decode a non-interlaced image.
- */
-
-static qboolean DecodeImageNonInterlaced(struct PNG_Chunk_IHDR *IHDR,
-                                         byte                  *OutBuffer, 
-                                         uint8_t               *DecompressedData,
-                                         uint32_t               DecompressedDataLength,
-                                         qboolean               HasTransparentColour,
-                                         uint8_t               *TransparentColour,
-                                         uint8_t               *OutPal)
-{
-    uint32_t IHDR_Width;
-    uint32_t IHDR_Height;
-    uint32_t BytesPerScanline, BytesPerPixel, PixelsPerByte;
-    uint32_t  w, h, p;
-    byte *OutPtr;
-    uint8_t *DecompPtr;
-
-    /*
-     *  input verification
-     */
-
-    if(!(IHDR && OutBuffer && DecompressedData && DecompressedDataLength && TransparentColour && OutPal))
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  byte swapping
-     */
-     
-    IHDR_Width  = BigLong(IHDR->Width);
-    IHDR_Height = BigLong(IHDR->Height);
-
-    /*
-     *  information for un-filtering
-     */
-
-    switch(IHDR->ColourType)
-    {
-        case PNG_ColourType_Grey :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_1 :
-                case PNG_BitDepth_2 :
-                case PNG_BitDepth_4 :
-                {
-                    BytesPerPixel    = 1;
-                    PixelsPerByte    = 8 / IHDR->BitDepth;
-
-                    break;
-                }
-
-                case PNG_BitDepth_8  :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_Grey;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-  
-        case PNG_ColourType_True :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8  :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_True;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-     
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_Indexed :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_1 :
-                case PNG_BitDepth_2 :
-                case PNG_BitDepth_4 :
-                {
-                    BytesPerPixel    = 1;
-                    PixelsPerByte    = 8 / IHDR->BitDepth;
-
-                    break;
-                }
-
-                case PNG_BitDepth_8 :
-                {
-                    BytesPerPixel    = PNG_NumColourComponents_Indexed;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-         
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_GreyAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_GreyAlpha;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-     
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_TrueAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_TrueAlpha;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-    
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-
-            break;
-        }
-
-        default :
-        {
-            return(qfalse);
-        }
-    }
-
-    /*
-     *  Calculate the size of one scanline
-     */
-
-    BytesPerScanline = (IHDR_Width * BytesPerPixel + (PixelsPerByte - 1)) / PixelsPerByte;
-
-    /*
-     *  Check if we have enough data for the whole image.
-     */
-
-    if(!(DecompressedDataLength == ((BytesPerScanline + 1) * IHDR_Height)))
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  Unfilter the image.
-     */
-
-    if(!UnfilterImage(DecompressedData, IHDR_Height, BytesPerScanline, BytesPerPixel))
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  Set the working pointers to the beginning of the buffers.
-     */
-
-    OutPtr = OutBuffer;
-    DecompPtr = DecompressedData;
-
-    /*
-     *  Create the output image.
-     */
-
-    for(h = 0; h < IHDR_Height; h++)
-    {
-        /*
-         *  Count the pixels on the scanline for those multipixel bytes
-         */
-
-        uint32_t CurrPixel;
-  
-        /*
-         *  skip FilterType
-         */
-
-        DecompPtr++;
-
-        /*
-         *  Reset the pixel count.
-         */
-
-        CurrPixel = 0;
-
-        for(w = 0; w < (BytesPerScanline / BytesPerPixel); w++)
-        {
-            if(PixelsPerByte > 1)
-            {
-                uint8_t  Mask;
-                uint32_t Shift;
-                uint8_t  SinglePixel;
-
-                for(p = 0; p < PixelsPerByte; p++)
-                {
-                    if(CurrPixel < IHDR_Width)
-                    {
-                        Mask  = (1 << IHDR->BitDepth) - 1;
-                        Shift = (PixelsPerByte - 1 - p) * IHDR->BitDepth;
-
-                        SinglePixel = ((DecompPtr[0] & (Mask << Shift)) >> Shift);
-
-                        if(!ConvertPixel(IHDR, OutPtr, &SinglePixel, HasTransparentColour, TransparentColour, OutPal))
-                        {
-                            return(qfalse);
-                        }
-
-                        OutPtr += Q3IMAGE_BYTESPERPIXEL;
-                        CurrPixel++;
-                    }
-                }
-            
-            }
-            else
-            {
-                if(!ConvertPixel(IHDR, OutPtr, DecompPtr, HasTransparentColour, TransparentColour, OutPal))
-                {
-                    return(qfalse);
-                }
-  
-
-                OutPtr += Q3IMAGE_BYTESPERPIXEL;
-            }
-
-            DecompPtr += BytesPerPixel;
-        }
-    }
-
-    return(qtrue);
-}
-
-/*
- *  Decode an interlaced image.
- */
-
-static qboolean DecodeImageInterlaced(struct PNG_Chunk_IHDR *IHDR,
-                                      byte                  *OutBuffer, 
-                                      uint8_t               *DecompressedData,
-                                      uint32_t               DecompressedDataLength,
-                                      qboolean               HasTransparentColour,
-                                      uint8_t               *TransparentColour,
-                                      uint8_t               *OutPal)
-{
-    uint32_t IHDR_Width;
-    uint32_t IHDR_Height;
-    uint32_t BytesPerScanline[PNG_Adam7_NumPasses], BytesPerPixel, PixelsPerByte;
-    uint32_t PassWidth[PNG_Adam7_NumPasses], PassHeight[PNG_Adam7_NumPasses];
-    uint32_t WSkip[PNG_Adam7_NumPasses], WOffset[PNG_Adam7_NumPasses], HSkip[PNG_Adam7_NumPasses], HOffset[PNG_Adam7_NumPasses];
-    uint32_t w, h, p, a;
-    byte *OutPtr;
-    uint8_t *DecompPtr;
-    uint32_t TargetLength;
-
-    /*
-     *  input verification
-     */
-
-    if(!(IHDR && OutBuffer && DecompressedData && DecompressedDataLength && TransparentColour && OutPal))
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  byte swapping
-     */
-
-    IHDR_Width  = BigLong(IHDR->Width);
-    IHDR_Height = BigLong(IHDR->Height);
-
-    /*
-     *  Skip and Offset for the passes.
-     */
-
-    WSkip[0]   = 8;
-    WOffset[0] = 0;
-    HSkip[0]   = 8;
-    HOffset[0] = 0;
-
-    WSkip[1]   = 8;
-    WOffset[1] = 4;
-    HSkip[1]   = 8;
-    HOffset[1] = 0;
-
-    WSkip[2]   = 4;
-    WOffset[2] = 0;
-    HSkip[2]   = 8;
-    HOffset[2] = 4;
-
-    WSkip[3]   = 4;
-    WOffset[3] = 2;
-    HSkip[3]   = 4;
-    HOffset[3] = 0;
-
-    WSkip[4]   = 2;
-    WOffset[4] = 0;
-    HSkip[4]   = 4;
-    HOffset[4] = 2;
-
-    WSkip[5]   = 2;
-    WOffset[5] = 1;
-    HSkip[5]   = 2;
-    HOffset[5] = 0;
-
-    WSkip[6]   = 1;
-    WOffset[6] = 0;
-    HSkip[6]   = 2;
-    HOffset[6] = 1;
-
-    /*
-     *  Calculate the sizes of the passes.
-     */
-
-    PassWidth[0]  = (IHDR_Width  + 7) / 8;
-    PassHeight[0] = (IHDR_Height + 7) / 8;
-
-    PassWidth[1]  = (IHDR_Width  + 3) / 8;
-    PassHeight[1] = (IHDR_Height + 7) / 8;
-
-    PassWidth[2]  = (IHDR_Width  + 3) / 4;
-    PassHeight[2] = (IHDR_Height + 3) / 8;
-
-    PassWidth[3]  = (IHDR_Width  + 1) / 4;
-    PassHeight[3] = (IHDR_Height + 3) / 4;
-
-    PassWidth[4]  = (IHDR_Width  + 1) / 2;
-    PassHeight[4] = (IHDR_Height + 1) / 4;
-
-    PassWidth[5]  = (IHDR_Width  + 0) / 2;
-    PassHeight[5] = (IHDR_Height + 1) / 2;
-
-    PassWidth[6]  = (IHDR_Width  + 0) / 1;
-    PassHeight[6] = (IHDR_Height + 0) / 2;
-
-    /*
-     *  information for un-filtering
-     */
-
-    switch(IHDR->ColourType)
-    {
-        case PNG_ColourType_Grey :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_1 :
-                case PNG_BitDepth_2 :
-                case PNG_BitDepth_4 :
-                {
-                    BytesPerPixel    = 1;
-                    PixelsPerByte    = 8 / IHDR->BitDepth;
-
-                    break;
-                }
-
-                case PNG_BitDepth_8  :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_Grey;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-  
-        case PNG_ColourType_True :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8  :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_True;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-     
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_Indexed :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_1 :
-                case PNG_BitDepth_2 :
-                case PNG_BitDepth_4 :
-                {
-                    BytesPerPixel    = 1;
-                    PixelsPerByte    = 8 / IHDR->BitDepth;
-
-                    break;
-                }
-
-                case PNG_BitDepth_8 :
-                {
-                    BytesPerPixel    = PNG_NumColourComponents_Indexed;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-         
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_GreyAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_GreyAlpha;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-     
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-  
-            break;
-        }
-
-        case PNG_ColourType_TrueAlpha :
-        {
-            switch(IHDR->BitDepth)
-            {
-                case PNG_BitDepth_8 :
-                case PNG_BitDepth_16 :
-                {
-                    BytesPerPixel    = (IHDR->BitDepth / 8) * PNG_NumColourComponents_TrueAlpha;
-                    PixelsPerByte    = 1;
-
-                    break;
-                }
-    
-                default :
-                {
-                    return(qfalse);
-                }
-            }
-
-            break;
-        }
-
-        default :
-        {
-            return(qfalse);
-        }
-    }
-
-    /*
-     *  Calculate the size of the scanlines per pass
-     */
-
-    for(a = 0; a < PNG_Adam7_NumPasses; a++)
-    {
-        BytesPerScanline[a] = (PassWidth[a] * BytesPerPixel + (PixelsPerByte - 1)) / PixelsPerByte;
-    }
-
-    /*
-     *  Calculate the size of all passes
-     */
-
-    TargetLength = 0;
-
-    for(a = 0; a < PNG_Adam7_NumPasses; a++)
-    {
-        TargetLength += ((BytesPerScanline[a] + (BytesPerScanline[a] ? 1 : 0)) * PassHeight[a]);
-    }
-
-    /*
-     *  Check if we have enough data for the whole image.
-     */
-
-    if(!(DecompressedDataLength == TargetLength))
-    {
-        return(qfalse);
-    }
-
-    /*
-     *  Unfilter the image.
-     */
-
-    DecompPtr = DecompressedData;
-
-    for(a = 0; a < PNG_Adam7_NumPasses; a++)
-    {
-        if(!UnfilterImage(DecompPtr, PassHeight[a], BytesPerScanline[a], BytesPerPixel))
-        {
-            return(qfalse);
-        }
-        
-        DecompPtr += ((BytesPerScanline[a] + (BytesPerScanline[a] ? 1 : 0)) * PassHeight[a]);
-    }
-
-    /*
-     *  Set the working pointers to the beginning of the buffers.
-     */
-
-    DecompPtr = DecompressedData;
-
-    /*
-     *  Create the output image.
-     */
-
-    for(a = 0; a < PNG_Adam7_NumPasses; a++)
-    {
-        for(h = 0; h < PassHeight[a]; h++)
-        {
-            /*
-             *  Count the pixels on the scanline for those multipixel bytes
-             */
-
-            uint32_t CurrPixel;
-
-            /*
-             *  skip FilterType
-             */
-
-            DecompPtr++;
-
-            /*
-             *  Reset the pixel count.
-             */
-
-            CurrPixel = 0;
-
-            for(w = 0; w < (BytesPerScanline[a] / BytesPerPixel); w++)
-            {
-                if(PixelsPerByte > 1)
-                {
-                    uint8_t  Mask;
-                    uint32_t Shift;
-                    uint8_t  SinglePixel;
-
-                    for(p = 0; p < PixelsPerByte; p++)
-                    {
-                        if(CurrPixel < PassWidth[a])
-                        {
-                            Mask  = (1 << IHDR->BitDepth) - 1;
-                            Shift = (PixelsPerByte - 1 - p) * IHDR->BitDepth;
-
-                            SinglePixel = ((DecompPtr[0] & (Mask << Shift)) >> Shift);
-
-                            OutPtr = OutBuffer + (((((h * HSkip[a]) + HOffset[a]) * IHDR_Width) + ((CurrPixel * WSkip[a]) + WOffset[a])) * Q3IMAGE_BYTESPERPIXEL);
-
-                            if(!ConvertPixel(IHDR, OutPtr, &SinglePixel, HasTransparentColour, TransparentColour, OutPal))
-                            {
-                                return(qfalse);
-                            }
-
-                            CurrPixel++;
-                        }
-                    }
-            
-                }
-                else
-                {
-                    OutPtr = OutBuffer + (((((h * HSkip[a]) + HOffset[a]) * IHDR_Width) + ((w * WSkip[a]) + WOffset[a])) * Q3IMAGE_BYTESPERPIXEL);
-
-                    if(!ConvertPixel(IHDR, OutPtr, DecompPtr, HasTransparentColour, TransparentColour, OutPal))
-                    {
-                        return(qfalse);
-                    }
-                }
-
-                DecompPtr += BytesPerPixel;
-            }
-        }
-    }
-
-    return(qtrue);
-}
-
-/*
- *  The PNG loader
- */
-
-static void LoadPNG(const char *name, byte **pic, int *width, int *height)
-{
-    struct BufferedFile *ThePNG;
-    byte *OutBuffer;
-    uint8_t *Signature;
-    struct PNG_ChunkHeader *CH;
-    uint32_t ChunkHeaderLength;
-    uint32_t ChunkHeaderType;
-    struct PNG_Chunk_IHDR *IHDR;
-    uint32_t IHDR_Width;
-    uint32_t IHDR_Height;
-    PNG_ChunkCRC *CRC;
-    uint8_t *InPal;
-    uint8_t *DecompressedData;
-    uint32_t DecompressedDataLength;
-    uint32_t i;
-
-    /*
-     *  palette with 256 RGBA entries
-     */
-
-    uint8_t OutPal[1024];
-
-    /*
-     *  transparent colour from the tRNS chunk
-     */
-
-    qboolean HasTransparentColour = qfalse;
-    uint8_t TransparentColour[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
-
-    /*
-     *  input verification
-     */
-
-    if(!(name && pic))
-    {
-        return;
-    }
-
-    /*
-     *  Zero out return values.
-     */
-
-    *pic = NULL;
-
-    if(width)
-    {
-        *width = 0;
-    }
-
-    if(height)
-    {
-        *height = 0;
-    }
-
-    /*
-     *  Read the file.
-     */
-
-    ThePNG = ReadBufferedFile(name);
-    if(!ThePNG)
-    {
-        return;
-    }           
-
-    /*
-     *  Read the siganture of the file.
-     */
-
-    Signature = BufferedFileRead(ThePNG, PNG_Signature_Size);
-    if(!Signature)
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return;
-    }
- 
-    /*
-     *  Is it a PNG?
-     */
-
-    if(memcmp(Signature, PNG_Signature, PNG_Signature_Size))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Read the first chunk-header.
-     */
-
-    CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size);
-    if(!CH)
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  PNG multi-byte types are in Big Endian
-     */
-
-    ChunkHeaderLength = BigLong(CH->Length);
-    ChunkHeaderType   = BigLong(CH->Type);
-
-    /*
-     *  Check if the first chunk is an IHDR.
-     */
-
-    if(!((ChunkHeaderType == PNG_ChunkType_IHDR) && (ChunkHeaderLength == PNG_Chunk_IHDR_Size)))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Read the IHDR.
-     */ 
-
-    IHDR = BufferedFileRead(ThePNG, PNG_Chunk_IHDR_Size);
-    if(!IHDR)
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Read the CRC for IHDR
-     */
-
-    CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size);
-    if(!CRC)
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
- 
-    /*
-     *  Here we could check the CRC if we wanted to.
-     */
- 
-    /*
-     *  multi-byte type swapping
-     */
-
-    IHDR_Width  = BigLong(IHDR->Width);
-    IHDR_Height = BigLong(IHDR->Height);
- 
-    /*
-     *  Check if Width and Height are valid.
-     */
-
-    if(!((IHDR_Width > 0) && (IHDR_Height > 0)))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Do we need to check if the dimensions of the image are valid for Quake3?
-     */
-
-    /*
-     *  Check if CompressionMethod and FilterMethod are valid.
-     */
-
-    if(!((IHDR->CompressionMethod == PNG_CompressionMethod_0) && (IHDR->FilterMethod == PNG_FilterMethod_0)))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Check if InterlaceMethod is valid.
-     */
-
-    if(!((IHDR->InterlaceMethod == PNG_InterlaceMethod_NonInterlaced)  || (IHDR->InterlaceMethod == PNG_InterlaceMethod_Interlaced)))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return;
-    }
-
-    /*
-     *  Read palette for an indexed image.
-     */
-
-    if(IHDR->ColourType == PNG_ColourType_Indexed)
-    {
-        /*
-         *  We need the palette first.
-         */
-
-        if(!FindChunk(ThePNG, PNG_ChunkType_PLTE))
-        {
-            CloseBufferedFile(ThePNG);
-  
-            return;
-        }
-
-        /*
-         *  Read the chunk-header.
-         */
-
-        CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size);
-        if(!CH)
-        {
-            CloseBufferedFile(ThePNG);
-   
-            return; 
-        }
-
-        /*
-         *  PNG multi-byte types are in Big Endian
-         */
-
-        ChunkHeaderLength = BigLong(CH->Length);
-        ChunkHeaderType   = BigLong(CH->Type);
-  
-        /*
-         *  Check if the chunk is an PLTE.
-         */
-
-        if(!(ChunkHeaderType == PNG_ChunkType_PLTE))
-        {
-            CloseBufferedFile(ThePNG);
-   
-            return; 
-        }
-
-        /*
-         *  Check if Length is divisible by 3
-         */
-
-        if(ChunkHeaderLength % 3)
-        {
-            CloseBufferedFile(ThePNG);
-   
-            return;   
-        }
-
-        /*
-         *  Read the raw palette data
-         */
-
-        InPal = BufferedFileRead(ThePNG, ChunkHeaderLength);
-        if(!InPal)
-        {
-            CloseBufferedFile(ThePNG);
-   
-            return; 
-        }
-   
-        /*
-         *  Read the CRC for the palette
-         */
-
-        CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size);
-        if(!CRC)
-        {
-            CloseBufferedFile(ThePNG);
- 
-            return; 
-        }
-
-        /*
-         *  Set some default values.
-         */
-
-        for(i = 0; i < 256; i++)
-        {
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 0] = 0x00;
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 1] = 0x00;
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 2] = 0x00;
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = 0xFF;  
-        }
-
-        /*
-         *  Convert to the Quake3 RGBA-format.
-         */
-
-        for(i = 0; i < (ChunkHeaderLength / 3); i++)
-        {
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 0] = InPal[i*3+0];
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 1] = InPal[i*3+1];
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 2] = InPal[i*3+2];
-            OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = 0xFF;
-        }
-    }
-
-    /*
-     *  transparency information is sometimes stored in an tRNS chunk
-     */
-
-    /*
-     *  Let's see if there is a tRNS chunk
-     */
-
-    if(FindChunk(ThePNG, PNG_ChunkType_tRNS))
-    {
-        uint8_t *Trans;
-
-        /*
-         *  Read the chunk-header.
-         */
-
-        CH = BufferedFileRead(ThePNG, PNG_ChunkHeader_Size);
-        if(!CH)
-        {
-            CloseBufferedFile(ThePNG);
- 
-            return; 
-        }
-
-        /*
-         *  PNG multi-byte types are in Big Endian
-         */
-
-        ChunkHeaderLength = BigLong(CH->Length);
-        ChunkHeaderType   = BigLong(CH->Type);
-
-        /*
-         *  Check if the chunk is an tRNS.
-         */
-
-        if(!(ChunkHeaderType == PNG_ChunkType_tRNS))
-        {
-            CloseBufferedFile(ThePNG);
- 
-            return; 
-        }
-
-        /*
-         *  Read the transparency information.
-         */
-
-        Trans = BufferedFileRead(ThePNG, ChunkHeaderLength);
-        if(!Trans)
-        {
-            CloseBufferedFile(ThePNG);
- 
-            return;  
-        }
-
-        /*
-         *  Read the CRC.
-         */
-
-        CRC = BufferedFileRead(ThePNG, PNG_ChunkCRC_Size);
-        if(!CRC)
-        {
-            CloseBufferedFile(ThePNG);
-  
-            return; 
-        }
- 
-        /*
-         *  Only for Grey, True and Indexed ColourType should tRNS exist.
-         */
-
-        switch(IHDR->ColourType)
-        {
-            case PNG_ColourType_Grey :
-            {
-                if(!ChunkHeaderLength == 2)
-                {
-                    CloseBufferedFile(ThePNG);
-  
-                    return;    
-                }
-   
-                HasTransparentColour = qtrue;
-   
-                /*
-                 *  Grey can have one colour which is completely transparent.
-                 *  This colour is always stored in 16 bits.
-                 */
-
-                TransparentColour[0] = Trans[0];
-                TransparentColour[1] = Trans[1];
-   
-                break;
-            }
-   
-            case PNG_ColourType_True :
-            {
-                if(!ChunkHeaderLength == 6)
-                {
-                    CloseBufferedFile(ThePNG);
-  
-                    return;    
-                }
-   
-                HasTransparentColour = qtrue;
-
-                /*
-                 *  True can have one colour which is completely transparent.
-                 *  This colour is always stored in 16 bits.
-                 */
-
-                TransparentColour[0] = Trans[0];
-                TransparentColour[1] = Trans[1];
-                TransparentColour[2] = Trans[2];
-                TransparentColour[3] = Trans[3];
-                TransparentColour[4] = Trans[4];
-                TransparentColour[5] = Trans[5];
-   
-                break;
-            }
-   
-            case PNG_ColourType_Indexed :
-            {
-                /*
-                 *  Maximum of 256 one byte transparency entries.
-                 */
-                
-                if(ChunkHeaderLength > 256)
-                {
-                    CloseBufferedFile(ThePNG);
-  
-                    return;    
-                }
-
-                HasTransparentColour = qtrue;
-
-                /*
-                 *  alpha values for palette entries
-                 */
-
-                for(i = 0; i < ChunkHeaderLength; i++)
-                {
-                    OutPal[i * Q3IMAGE_BYTESPERPIXEL + 3] = Trans[i];
-                }
-
-                break;
-            }
-  
-            /*
-             *  All other ColourTypes should not have tRNS chunks
-             */
-
-            default :
-            {
-                CloseBufferedFile(ThePNG);
-  
-                return;
-            }
-        } 
-    }
-
-    /*
-     *  Rewind to the start of the file.
-     */
-
-    if(!BufferedFileRewind(ThePNG, -1))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
- 
-    /*
-     *  Skip the signature
-     */
-
-    if(!BufferedFileSkip(ThePNG, PNG_Signature_Size))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return; 
-    }
-
-    /*
-     *  Decompress all IDAT chunks
-     */
-
-    DecompressedDataLength = DecompressIDATs(ThePNG, &DecompressedData);
-    if(!(DecompressedDataLength && DecompressedData))
-    {
-        CloseBufferedFile(ThePNG);
- 
-        return;
-    }
-
-    /*
-     *  Allocate output buffer.
-     */
-
-    OutBuffer = ri.Malloc(IHDR_Width * IHDR_Height * Q3IMAGE_BYTESPERPIXEL); 
-    if(!OutBuffer)
-    {
-        ri.Free(DecompressedData); 
-        CloseBufferedFile(ThePNG);
- 
-        return;  
-    }
-
-    /*
-     *  Interlaced and Non-interlaced images need to be handled differently.
-     */
-
-    switch(IHDR->InterlaceMethod)
-    {
-        case PNG_InterlaceMethod_NonInterlaced :
-        {
-            if(!DecodeImageNonInterlaced(IHDR, OutBuffer, DecompressedData, DecompressedDataLength, HasTransparentColour, TransparentColour, OutPal))
-            {
-                ri.Free(OutBuffer); 
-                ri.Free(DecompressedData); 
-                CloseBufferedFile(ThePNG);
-
-                return;
-            }
-        
-            break;
-        }
-        
-        case PNG_InterlaceMethod_Interlaced :
-        {
-            if(!DecodeImageInterlaced(IHDR, OutBuffer, DecompressedData, DecompressedDataLength, HasTransparentColour, TransparentColour, OutPal))
-            {
-                ri.Free(OutBuffer); 
-                ri.Free(DecompressedData); 
-                CloseBufferedFile(ThePNG);
-
-                return;
-            }
-        
-            break;
-        }
-    
-        default :
-        {
-            ri.Free(OutBuffer); 
-            ri.Free(DecompressedData); 
-            CloseBufferedFile(ThePNG);
-
-            return;
-        }
-    }
-
-    /*
-     *  update the pointer to the image data
-     */
-
-    *pic = OutBuffer;
- 
-    /*
-     *  Fill width and height.
-     */
-
-    if(width)
-    {
-        *width = IHDR_Width;
-    }
-
-    if(height)
-    {
-        *height = IHDR_Height;
-    }
-
-    /*
-     *  DecompressedData is not needed anymore.
-     */
-
-    ri.Free(DecompressedData); 
-
-    /*
-     *  We have all data, so close the file.
-     */
-
-    CloseBufferedFile(ThePNG);
-}
 
 //===================================================================
@@ -4405 +817 @@
 static imageExtToLoaderMap_t imageLoaders[ ] =
 {
-        { "tga",  LoadTGA },
-        { "jpg",  LoadJPG },
-        { "jpeg", LoadJPG },
-        { "png",  LoadPNG },
-        { "pcx",  LoadPCX32 },
-        { "bmp",  LoadBMP }
+        { "tga",  R_LoadTGA },
+        { "jpg",  R_LoadJPG },
+        { "jpeg", R_LoadJPG },
+        { "png",  R_LoadPNG },
+        { "pcx",  R_LoadPCX },
+        { "bmp",  R_LoadBMP }
 };
 

src/renderer/tr_local.h

@@ -1476 +1476 @@
 #endif
 
+/*
+=============================================================
+
+IMAGE LOADERS
+
+=============================================================
+*/
+
+void R_LoadBMP( const char *name, byte **pic, int *width, int *height );
+void R_LoadJPG( const char *name, byte **pic, int *width, int *height );
+void R_LoadPCX( const char *name, byte **pic, int *width, int *height );
+void R_LoadPNG( const char *name, byte **pic, int *width, int *height );
+void R_LoadTGA( const char *name, byte **pic, int *width, int *height );
 /*
 =============================================================