gtkradiant/tools/quake3/q3map2/image.c

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/*
Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.
This file is part of GtkRadiant.
GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GtkRadiant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
----------------------------------------------------------------------------------
This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."
------------------------------------------------------------------------------- */
/* marker */
#define IMAGE_C
/* dependencies */
#include "q3map2.h"
/* -------------------------------------------------------------------------------
this file contains image pool management with reference counting. note: it isn't
reentrant, so only call it from init/shutdown code or wrap calls in a mutex
------------------------------------------------------------------------------- */
/*
LoadDDSBuffer()
loads a dxtc (1, 3, 5) dds buffer into a valid rgba image
*/
static void LoadDDSBuffer( byte *buffer, int size, byte **pixels, int *width, int *height )
{
int w, h;
ddsPF_t pf;
/* dummy check */
if( buffer == NULL || size <= 0 || pixels == NULL || width == NULL || height == NULL )
return;
/* null out */
*pixels = 0;
*width = 0;
*height = 0;
/* get dds info */
if( DDSGetInfo( (ddsBuffer_t*) buffer, &w, &h, &pf ) )
{
Sys_Printf( "WARNING: Invalid DDS texture\n" );
return;
}
/* only certain types of dds textures are supported */
if( pf != DDS_PF_ARGB8888 && pf != DDS_PF_DXT1 && pf != DDS_PF_DXT3 && pf != DDS_PF_DXT5 )
{
Sys_Printf( "WARNING: Only DDS texture formats ARGB8888, DXT1, DXT3, and DXT5 are supported (%d)\n", pf );
return;
}
/* create image pixel buffer */
*width = w;
*height = h;
*pixels = safe_malloc( w * h * 4 );
/* decompress the dds texture */
DDSDecompress( (ddsBuffer_t*) buffer, *pixels );
}
/*
PNGReadData()
callback function for libpng to read from a memory buffer
note: this function is a total hack, as it reads/writes the png struct directly!
*/
typedef struct pngBuffer_s
{
byte *buffer;
int size, offset;
}
pngBuffer_t;
void PNGReadData( png_struct *png, png_byte *buffer, png_size_t size )
{
pngBuffer_t *pb = (pngBuffer_t*) png_get_io_ptr( png );
if( (pb->offset + size) > pb->size )
size = (pb->size - pb->offset);
memcpy( buffer, &pb->buffer[ pb->offset ], size );
pb->offset += size;
//% Sys_Printf( "Copying %d bytes from 0x%08X to 0x%08X (offset: %d of %d)\n", size, &pb->buffer[ pb->offset ], buffer, pb->offset, pb->size );
}
/*
LoadPNGBuffer()
loads a png file buffer into a valid rgba image
*/
static void LoadPNGBuffer( byte *buffer, int size, byte **pixels, int *width, int *height )
{
png_struct *png;
png_info *info, *end;
pngBuffer_t pb;
int i, bitDepth, colorType, channels;
png_uint_32 w, h;
byte **rowPointers;
/* dummy check */
if( buffer == NULL || size <= 0 || pixels == NULL || width == NULL || height == NULL )
return;
/* null out */
*pixels = 0;
*width = 0;
*height = 0;
/* determine if this is a png file */
if( png_sig_cmp( buffer, 0, 8 ) != 0 )
{
Sys_Printf( "WARNING: Invalid PNG file\n" );
return;
}
/* create png structs */
png = png_create_read_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL );
if( png == NULL )
{
Sys_Printf( "WARNING: Unable to create PNG read struct\n" );
return;
}
info = png_create_info_struct( png );
if( info == NULL )
{
Sys_Printf( "WARNING: Unable to create PNG info struct\n" );
png_destroy_read_struct( &png, NULL, NULL );
return;
}
end = png_create_info_struct( png );
if( end == NULL )
{
Sys_Printf( "WARNING: Unable to create PNG end info struct\n" );
png_destroy_read_struct( &png, &info, NULL );
return;
}
/* set read callback */
pb.buffer = buffer;
pb.size = size;
pb.offset = 0;
png_set_read_fn( png, &pb, PNGReadData );
png->io_ptr = &pb; /* hack! */
/* set error longjmp */
if( setjmp( png->jmpbuf ) )
{
Sys_Printf( "WARNING: An error occurred reading PNG image\n" );
png_destroy_read_struct( &png, &info, &end );
return;
}
/* fixme: add proper i/o stuff here */
/* read png info */
png_read_info( png, info );
/* read image header chunk */
png_get_IHDR( png, info,
&w, &h, &bitDepth, &colorType, NULL, NULL, NULL );
/* read number of channels */
channels = png_get_channels( png, info );
/* the following will probably bork on certain types of png images, but hey... */
/* force indexed/gray/trans chunk to rgb */
if( (colorType == PNG_COLOR_TYPE_PALETTE && bitDepth <= 8) ||
(colorType == PNG_COLOR_TYPE_GRAY && bitDepth <= 8) ||
png_get_valid( png, info, PNG_INFO_tRNS ) )
png_set_expand( png );
/* strip 16bpc -> 8bpc */
if( bitDepth == 16 )
png_set_strip_16( png );
/* pad rgb to rgba */
if( bitDepth == 8 && colorType == PNG_COLOR_TYPE_RGB)
png_set_filler( png, 255, PNG_FILLER_AFTER );
/* create image pixel buffer */
*width = w;
*height = h;
*pixels = safe_malloc( w * h * 4 );
/* create row pointers */
rowPointers = safe_malloc( h * sizeof( byte* ) );
for( i = 0; i < h; i++ )
rowPointers[ i ] = *pixels + (i * w * 4);
/* read the png */
png_read_image( png, rowPointers );
/* clean up */
free( rowPointers );
png_destroy_read_struct( &png, &info, &end );
}
/*
ImageInit()
implicitly called by every function to set up image list
*/
static void ImageInit( void )
{
int i;
if( numImages <= 0 )
{
/* clear images (fixme: this could theoretically leak) */
memset( images, 0, sizeof( images ) );
/* generate *bogus image */
images[ 0 ].name = safe_malloc( strlen( DEFAULT_IMAGE ) + 1 );
strcpy( images[ 0 ].name, DEFAULT_IMAGE );
images[ 0 ].filename = safe_malloc( strlen( DEFAULT_IMAGE ) + 1 );
strcpy( images[ 0 ].filename, DEFAULT_IMAGE );
images[ 0 ].width = 64;
images[ 0 ].height = 64;
images[ 0 ].refCount = 1;
images[ 0 ].pixels = safe_malloc( 64 * 64 * 4 );
for( i = 0; i < (64 * 64 * 4); i++ )
images[ 0 ].pixels[ i ] = 255;
}
}
/*
ImageFree()
frees an rgba image
*/
void ImageFree( image_t *image )
{
/* dummy check */
if( image == NULL )
return;
/* decrement refcount */
image->refCount--;
/* free? */
if( image->refCount <= 0 )
{
if( image->name != NULL )
free( image->name );
image->name = NULL;
if( image->filename != NULL )
free( image->filename );
image->filename = NULL;
free( image->pixels );
image->width = 0;
image->height = 0;
numImages--;
}
}
/*
ImageFind()
finds an existing rgba image and returns a pointer to the image_t struct or NULL if not found
*/
image_t *ImageFind( const char *filename )
{
int i;
char name[ 1024 ];
/* init */
ImageInit();
/* dummy check */
if( filename == NULL || filename[ 0 ] == '\0' )
return NULL;
/* strip file extension off name */
strcpy( name, filename );
StripExtension( name );
/* search list */
for( i = 0; i < MAX_IMAGES; i++ )
{
if( images[ i ].name != NULL && !strcmp( name, images[ i ].name ) )
return &images[ i ];
}
/* no matching image found */
return NULL;
}
/*
ImageLoad()
loads an rgba image and returns a pointer to the image_t struct or NULL if not found
*/
image_t *ImageLoad( const char *filename )
{
int i;
image_t *image;
char name[ 1024 ];
int size;
byte *buffer = NULL;
/* init */
ImageInit();
/* dummy check */
if( filename == NULL || filename[ 0 ] == '\0' )
return NULL;
/* strip file extension off name */
strcpy( name, filename );
StripExtension( name );
/* try to find existing image */
image = ImageFind( name );
if( image != NULL )
{
image->refCount++;
return image;
}
/* none found, so find first non-null image */
image = NULL;
for( i = 0; i < MAX_IMAGES; i++ )
{
if( images[ i ].name == NULL )
{
image = &images[ i ];
break;
}
}
/* too many images? */
if( image == NULL )
Error( "MAX_IMAGES (%d) exceeded, there are too many image files referenced by the map.", MAX_IMAGES );
/* set it up */
image->name = safe_malloc( strlen( name ) + 1 );
strcpy( image->name, name );
/* attempt to load tga */
StripExtension( name );
strcat( name, ".tga" );
size = vfsLoadFile( (const char*) name, (void**) &buffer, 0 );
if( size > 0 )
LoadTGABuffer( buffer, &image->pixels, &image->width, &image->height );
else
{
/* attempt to load png */
StripExtension( name );
strcat( name, ".png" );
size = vfsLoadFile( (const char*) name, (void**) &buffer, 0 );
if( size > 0 )
LoadPNGBuffer( buffer, size, &image->pixels, &image->width, &image->height );
else
{
/* attempt to load jpg */
StripExtension( name );
strcat( name, ".jpg" );
size = vfsLoadFile( (const char*) name, (void**) &buffer, 0 );
if( size > 0 )
{
if( LoadJPGBuff( buffer, size, &image->pixels, &image->width, &image->height ) == -1 && image->pixels != NULL )
Sys_Printf( "WARNING: LoadJPGBuff: %s\n", (unsigned char*) image->pixels );
}
else
{
/* attempt to load dds */
StripExtension( name );
strcat( name, ".dds" );
size = vfsLoadFile( (const char*) name, (void**) &buffer, 0 );
if( size > 0 )
{
LoadDDSBuffer( buffer, size, &image->pixels, &image->width, &image->height );
/* debug code */
#if 1
{
ddsPF_t pf;
DDSGetInfo( (ddsBuffer_t*) buffer, NULL, NULL, &pf );
Sys_Printf( "pf = %d\n", pf );
if( image->width > 0 )
{
StripExtension( name );
strcat( name, "_converted.tga" );
WriteTGA( "C:\\games\\quake3\\baseq3\\textures\\rad\\dds_converted.tga", image->pixels, image->width, image->height );
}
}
#endif
}
}
}
}
/* free file buffer */
free( buffer );
/* make sure everything's kosher */
if( size <= 0 || image->width <= 0 || image->height <= 0 || image->pixels == NULL )
{
//% Sys_Printf( "size = %d width = %d height = %d pixels = 0x%08x (%s)\n",
//% size, image->width, image->height, image->pixels, name );
free( image->name );
image->name = NULL;
return NULL;
}
/* set filename */
image->filename = safe_malloc( strlen( name ) + 1 );
strcpy( image->filename, name );
/* set count */
image->refCount = 1;
numImages++;
/* return the image */
return image;
}