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Regard whitespace Rev 5130 → Rev 5131

/contrib/sdk/sources/SDL-1.2.2/SDL_anim-0.2.1/anim.c.BAK
0,0 → 1,362
/*
SDL_anim: an animation library for SDL
Copyright (C) 2001, 2002 Michael Leonhard
 
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
 
This library 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
Library General Public License for more details.
 
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Michael Leonhard
mike@tamale.net
*/
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <png.h>
#include "SDL_anim.h"
 
/* deal with MSVC++ crappiness */
#ifdef WIN32
#define strcasecmp _strcmpi
#endif
 
void Anim_Free( SDL_Animation *anim ) {
SDL_FreeSurface( anim->surface );
free( anim );
}
 
int Anim_GetFrameNum( SDL_Animation *anim, Uint32 start, Uint32 now ) {
int mspf, ms, frame;
if( now < start ) return 0;
 
mspf = anim->duration / anim->frames;
ms = now - start;
if( mspf == 0 ) frame = 0;
else frame = ms / mspf;
 
return frame;
}
 
void Anim_GetFrameRect( SDL_Animation *anim, int frame, SDL_Rect *rect ) {
rect->x = anim->w * (frame % anim->frames);
rect->y = 0;
rect->w = anim->w;
rect->h = anim->h;
}
 
int Anim_BlitFrame( SDL_Animation *anim, Uint32 start, Uint32 now, SDL_Surface *dest, SDL_Rect *dr ) {
int frame;
frame = Anim_GetFrameNum( anim, start, now );
return Anim_BlitFrameNum( anim, frame, dest, dr );
}
 
int Anim_BlitFrameNum( SDL_Animation *anim, int frame, SDL_Surface *dest, SDL_Rect *dr ) {
SDL_Rect rect;
Anim_GetFrameRect( anim, frame, &rect );
return SDL_BlitSurface( anim->surface, &rect, dest, dr );
}
 
int Anim_DisplayFormat( SDL_Animation *anim ) {
struct SDL_Surface *newsurface;
if( SDL_WasInit( SDL_INIT_VIDEO ) == 0 ) return 0;/*"Video is not initialized.\n"*/
newsurface = SDL_DisplayFormatAlpha( anim->surface );
if( !newsurface ) return 0;
anim->surface = newsurface;
return 1;
}
 
int DoAnimFormat( char *text, int *duration, int *framewidth, int *numframes ) {
char *tok;
SDL_printf( "file is \"%s\"\n", text );
/* SDL_anim */
tok = strtok( text, " " );
if( !tok ) return 0;
if( strcasecmp( tok, "SDL_anim" ) != 0 ) {
SDL_printf( "no SDL_anim\n" );
return 0;
}
/* duration */
tok = strtok( NULL, " " );
if( !tok ) return 0;
*duration = atoi( tok );
if( *duration < 1 ) {
SDL_printf( "no duration\n" );
return 0;
}
 
/* framewidth */
tok = strtok( NULL, " " );
if( !tok ) return 0;
*framewidth = atoi( tok );
if( *framewidth < 1 ) {
SDL_printf( "no framewidth\n" );
return 0;
}
 
/* numframes */
tok = strtok( NULL, " " );
if( !tok ) return 0;
*numframes = atoi( tok );
if( *numframes < 1 ) {
SDL_printf( "no numframes\n" );
return 0;
}
 
return 1;
}
 
struct SDL_Animation *Anim_Load( const char *file ) {
int ckey = -1, i;
char buf[8];
static FILE *fp; /* "static" prevents setjmp corruption */
png_structp read_ptr;
png_infop read_info_ptr, end_info_ptr;
png_bytep *row_pointers;
png_textp text_ptr;
int num_text, t;
int interlace_type, compression_type, filter_type, bit_depth, color_type;
png_uint_32 width, height, row;
int duration, framewidth, numframes;
 
png_color_16p background;
double white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
double gamma;
int intent;
png_uint_16p hist;
png_uint_32 offset_x, offset_y;
int unit_type;
png_charp purpose, units;
png_charpp params;
png_int_32 X0, X1;
int type, nparams;
png_uint_32 res_x, res_y;
/* png_colorp palette;
int num_palette;
*/ png_color_8p sig_bit;
png_bytep trans;
int num_trans;
png_color_16p trans_values;
 
Uint32 Rmask;
Uint32 Gmask;
Uint32 Bmask;
Uint32 Amask;
 
SDL_Animation *anim;
SDL_Surface *surface;
SDL_Palette *palette;
 
if( !file ) return NULL;
 
/* printf( "opening file \"%s\"\n", file );
*/
/* open the file handle */
fp = fopen( file, "rb" );
if( fp == NULL ) {
SDL_printf( "fopen() failed\n" );
return NULL;
}
 
/* check if it's PNG */
if( fread( buf, 1, 8, fp ) != 8 ) {
SDL_printf( "fread() failed\n" );
return NULL;
}
if( png_sig_cmp( buf, (png_size_t)0, 8 ) ) {
SDL_printf( "not a PNG file\n" );
return NULL;
}
fseek( fp, 0, SEEK_SET );
 
/* allocate read structure */
read_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, (png_voidp)NULL, (png_error_ptr)NULL, (png_error_ptr)NULL );
if( read_ptr == NULL ) {
SDL_printf( "png_create_read_struct() failed\n" );
return NULL;
}
/* allocate read info structure */
read_info_ptr = png_create_info_struct( read_ptr );
if( read_info_ptr == NULL ) {
SDL_printf( "png_create_info_struct() failed\n" );
return NULL;
}
end_info_ptr = png_create_info_struct( read_ptr );
if( end_info_ptr == NULL ) {
SDL_printf( "png_create_info_struct() failed\n" );
return NULL;
}
 
/* set error handler code */
if( setjmp( read_ptr->jmpbuf ) ) {
SDL_printf( "libpng read error\n" );
return NULL;
}
 
/* initialize stream */
png_init_io( read_ptr, fp );
png_set_read_status_fn( read_ptr, NULL );
 
/* read png info struct */
png_read_info( read_ptr, read_info_ptr );
 
/* get the info */
if( !png_get_IHDR( read_ptr, read_info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, &compression_type, &filter_type ) ) {
SDL_printf( "png_get_IHDR() failed\n" );
return NULL;
}
 
/* background color */
png_get_bKGD( read_ptr, read_info_ptr, &background );
 
png_get_cHRM( read_ptr, read_info_ptr, &white_x, &white_y, &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y );
 
/* gamma */
png_get_gAMA( read_ptr, read_info_ptr, &gamma );
 
/* rendering intent */
png_get_sRGB( read_ptr, read_info_ptr, &intent );
 
/* Histogram */
png_get_hIST( read_ptr, read_info_ptr, &hist );
 
/* offsets */
png_get_oFFs( read_ptr, read_info_ptr, &offset_x, &offset_y, &unit_type );
png_get_pCAL( read_ptr, read_info_ptr, &purpose, &X0, &X1, &type, &nparams, &units, &params );
 
/* pixel density */
png_get_pHYs( read_ptr, read_info_ptr, &res_x, &res_y, &unit_type );
 
/* png_get_PLTE( read_ptr, read_info_ptr, &palette, &num_palette );
*/
/* significant bits */
png_get_sBIT( read_ptr, read_info_ptr, &sig_bit );
 
/* transparency */
if( png_get_tRNS( read_ptr, read_info_ptr, &trans, &num_trans, &trans_values ) ) {
if( color_type == PNG_COLOR_TYPE_PALETTE ) {
if( num_trans == 1 ) ckey = trans[0];
else png_set_expand( read_ptr );
}
else ckey = 0; /* actual value will be set later */
}
 
/* text chunks */
num_text = 0;
if( !png_get_text( read_ptr, read_info_ptr, &text_ptr, &num_text ) ) {
SDL_printf( "file has no text chunks\n" );
return NULL;
}
for( t = 0; t < num_text; t++ ) {
if( strcasecmp( text_ptr[t].key, "format" ) == 0 ) {
if( DoAnimFormat( text_ptr[t].text, &duration, &framewidth, &numframes ) ) break;
}
}
if( t == num_text ) {
SDL_printf( "file is not an SDL_anim PNG\n" );
return NULL;
}
 
png_set_strip_16( read_ptr );
png_set_packing( read_ptr );
if(color_type == PNG_COLOR_TYPE_GRAY)
png_set_expand( read_ptr );
 
/* Allocate the SDL surface to hold the image */
Rmask = Gmask = Bmask = Amask = 0;
if( color_type != PNG_COLOR_TYPE_PALETTE ) {
if( SDL_BYTEORDER == SDL_LIL_ENDIAN ) {
Rmask = 0x000000FF;
Gmask = 0x0000FF00;
Bmask = 0x00FF0000;
Amask = (read_info_ptr->channels == 4)? 0xFF000000 : 0;
}
else {
int s = (read_info_ptr->channels == 4) ? 0 : 8;
Rmask = 0xFF000000 >> s;
Gmask = 0x00FF0000 >> s;
Bmask = 0x0000FF00 >> s;
Amask = 0x000000FF >> s;
}
}
 
surface = SDL_AllocSurface( SDL_SWSURFACE, width, height, bit_depth * read_info_ptr->channels, Rmask, Gmask, Bmask, Amask );
if( surface == NULL ) {
Anim_SetError("Out of memory");
return NULL;
}
 
if(ckey != -1) {
if( color_type != PNG_COLOR_TYPE_PALETTE ) ckey = SDL_MapRGB( surface->format, (Uint8)trans_values->red, (Uint8)trans_values->green, (Uint8)trans_values->blue );
SDL_SetColorKey( surface, SDL_SRCCOLORKEY, ckey );
}
 
/* allocate row pointers */
row_pointers = (png_bytep *)malloc( sizeof( png_bytep ) * height );
if( row_pointers == NULL ) {
SDL_printf( "malloc() failed\n" );
return NULL;
}
for( row = 0; row < height; row++ ) {
row_pointers[row] = (Uint8 *)surface->pixels + row * surface->pitch;
}
 
png_read_image( read_ptr, row_pointers );
 
/* end io */
/* printf( "done\n" );
*/ png_read_end( read_ptr, end_info_ptr );
 
/* cleanup */
png_destroy_read_struct( &read_ptr, &read_info_ptr, &end_info_ptr);
fclose( fp );
 
/* Load the palette, if any */
palette = surface->format->palette;
if( palette ) {
if(color_type == PNG_COLOR_TYPE_GRAY) {
palette->ncolors = 256;
for( i = 0; i < 256; i++ ) {
palette->colors[i].r = i;
palette->colors[i].g = i;
palette->colors[i].b = i;
}
}
else if( read_info_ptr->num_palette > 0 ) {
palette->ncolors = read_info_ptr->num_palette;
for( i = 0; i < read_info_ptr->num_palette; ++i ) {
palette->colors[i].b = read_info_ptr->palette[i].blue;
palette->colors[i].g = read_info_ptr->palette[i].green;
palette->colors[i].r = read_info_ptr->palette[i].red;
}
}
}
anim = (struct SDL_Animation *)malloc( sizeof( struct SDL_Animation ) );
if( !anim ) {
SDL_printf( "malloc() failed\n" );
return NULL;
}
 
anim->surface = surface;
anim->w = framewidth;
anim->h = height;
anim->frames = numframes;
anim->duration = duration;
 
return anim;
}