329 lines
9.9 KiB
C
329 lines
9.9 KiB
C
/*
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SDL_anim: an animation library for SDL
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Copyright (C) 2001, 2002 Michael Leonhard
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Michael Leonhard
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mike@tamale.net
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <png.h>
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/* deal with MSVC++ crappiness */
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#ifdef WIN32UNDEFINED
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#define snprintf _snprintf
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#endif
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typedef struct inputstruct {
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FILE *file;
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char *name;
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png_structp read_ptr;
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png_infop read_info_ptr;
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};
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int numfiles;
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struct inputstruct *input;
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int main( int argc, char *argv[] ) {
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int f, rowbytes;
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char buf[256];
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static FILE *fpout; /* "static" prevents setjmp corruption */
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png_structp write_ptr;
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png_infop write_info_ptr, end_info_ptr;
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png_bytep row_buf, here;
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png_uint_32 y;
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png_textp text_ptr, new_text_ptr;
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int num_text;
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int interlace_type, compression_type, filter_type, bit_depth, color_type;
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int it, ct, ft, bd, clrt;
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png_uint_32 width, height, w, h;
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int duration;
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if( argc < 4 ) {
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printf( "makeanim v0.2\nusage: makeanim <duration in milliseconds> <input files ...> <output file>\n" );
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printf( "example: makeanim 1500 a00.png a01.png a02.png a03.png a04.png a.anim\n" );
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return 1;
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}
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duration = atoi( argv[1] );
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if( duration < 1 ) {
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printf( "duration is incorrect\n" );
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return 1;
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}
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numfiles = argc - 3;
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input = (struct inputstruct *)malloc( sizeof( struct inputstruct ) * numfiles );
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if( !input ) return 1;
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for( f = 0; f < numfiles; f++ ) {
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input[f].name = argv[f + 2];
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printf( "opening file %d, \"%s\"\n", f, input[f].name );
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/* open the file handle */
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input[f].file = fopen( input[f].name, "rb" );
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if( input[f].file == NULL ) {
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printf( "fopen() failed\n" );
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return 1;
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}
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/* check if it's PNG */
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if( fread( buf, 1, 8, input[f].file ) != 8 ) {
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printf( "fread() failed for file \"%s\"\n", input[f].name );
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return 1;
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}
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if( png_sig_cmp( buf, (png_size_t)0, 8 ) ) {
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printf( "not a PNG file\n" );
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return 1;
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}
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fseek( input[f].file, 0, SEEK_SET );
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/* allocate read structure */
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input[f].read_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, (png_voidp)NULL, (png_error_ptr)NULL, (png_error_ptr)NULL );
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if( input[f].read_ptr == NULL ) {
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printf( "png_create_read_struct() failed\n" );
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return 1;
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}
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/* allocate read info structure */
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input[f].read_info_ptr = png_create_info_struct( input[f].read_ptr );
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if( input[f].read_info_ptr == NULL ) {
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printf( "png_create_info_struct() failed\n" );
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return 1;
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}
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/* set error handler code */
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if( setjmp( input[f].read_ptr->jmpbuf ) ) {
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printf( "libpng read error\n" );
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return 1;
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}
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/* initialize stream */
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png_init_io( input[f].read_ptr, input[f].file );
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png_set_read_status_fn( input[f].read_ptr, NULL );
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/* read png info struct */
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png_read_info( input[f].read_ptr, input[f].read_info_ptr );
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/* get the info */
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if( !png_get_IHDR( input[f].read_ptr, input[f].read_info_ptr, &w, &h, &bd, &clrt, &it, &ct, &ft ) ) {
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printf( "png_get_IHDR() failed\n" );
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return 1;
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}
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/* save the info of the first frame */
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if( f == 0 ) {
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width = w;
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height = h;
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bit_depth = bd;
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color_type = clrt;
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interlace_type = it;
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compression_type = ct;
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filter_type = ft;
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}
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/* compare all other frames to first frame */
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else if( (w != width) ||
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(h != height) ||
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(bd != bit_depth) ||
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(clrt != color_type) ||
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(it != interlace_type) ||
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(ct != compression_type) ||
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(ft != filter_type) ) {
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if( w != width ) printf( "width is different\n" );
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if( h != height ) printf( "height is different\n" );
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if( bd != bit_depth ) printf( "bit depth is different\n" );
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if( clrt != color_type ) printf( "color type is different\n" );
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if( it != interlace_type ) printf( "interlace type is different\n" );
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if( ct != compression_type ) printf( "compression type is different\n" );
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if( ft != filter_type ) printf( "filter type is different\n" );
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return 1;
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}
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}
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row_buf = (png_bytep)NULL;
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/* open output file */
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printf( "opening file \"%s\"\n", argv[numfiles + 2] );
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fpout = fopen( argv[numfiles + 2], "wb" );
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if( fpout == NULL ) {
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printf( "fopen() failed\n" );
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return 1;
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}
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/* allocate write structure */
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write_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, (png_voidp)NULL, (png_error_ptr)NULL, (png_error_ptr)NULL );
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/* allocate info structures */
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write_info_ptr = png_create_info_struct( write_ptr );
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end_info_ptr = png_create_info_struct( write_ptr );
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/* error handling */
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if( setjmp( write_ptr->jmpbuf ) ) {
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printf( "libpng write error\n" );
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return 1;
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}
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/* initialize output stream */
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png_init_io( write_ptr, fpout );
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png_set_write_status_fn( write_ptr, NULL );
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/* set info */
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png_set_IHDR( write_ptr, write_info_ptr, width * numfiles, height, bit_depth, color_type, PNG_INTERLACE_NONE, compression_type, filter_type);
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/* image characteristics */
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{
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png_color_16p background;
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double white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
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double gamma;
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int intent;
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png_uint_16p hist;
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png_uint_32 offset_x, offset_y;
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int unit_type;
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png_charp purpose, units;
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png_charpp params;
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png_int_32 X0, X1;
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int type, nparams;
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png_uint_32 res_x, res_y;
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png_colorp palette;
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int num_palette;
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png_color_8p sig_bit;
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png_bytep trans;
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int num_trans;
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png_color_16p trans_values;
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/* background color */
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if( png_get_bKGD( input[0].read_ptr, input[0].read_info_ptr, &background ) ) {
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png_set_bKGD( write_ptr, write_info_ptr, background );
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}
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if( png_get_cHRM( input[0].read_ptr, input[0].read_info_ptr, &white_x, &white_y, &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y ) ) {
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png_set_cHRM( write_ptr, write_info_ptr, white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y );
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}
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/* gamma */
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if( png_get_gAMA( input[0].read_ptr, input[0].read_info_ptr, &gamma ) ) {
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png_set_gAMA( write_ptr, write_info_ptr, gamma );
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}
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/* rendering intent */
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if( png_get_sRGB( input[0].read_ptr, input[0].read_info_ptr, &intent ) ) {
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png_set_sRGB( write_ptr, write_info_ptr, intent );
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}
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/* Histogram */
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if( png_get_hIST( input[0].read_ptr, input[0].read_info_ptr, &hist ) ) {
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png_set_hIST( write_ptr, write_info_ptr, hist );
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}
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/* offsets */
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if( png_get_oFFs( input[0].read_ptr, input[0].read_info_ptr, &offset_x, &offset_y, &unit_type ) ) {
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png_set_oFFs( write_ptr, write_info_ptr, offset_x, offset_y, unit_type );
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}
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if( png_get_pCAL( input[0].read_ptr, input[0].read_info_ptr, &purpose, &X0, &X1, &type, &nparams, &units, ¶ms ) ) {
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png_set_pCAL( write_ptr, write_info_ptr, purpose, X0, X1, type, nparams, units, params );
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}
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/* pixel density */
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if( png_get_pHYs( input[0].read_ptr, input[0].read_info_ptr, &res_x, &res_y, &unit_type ) ) {
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png_set_pHYs( write_ptr, write_info_ptr, res_x, res_y, unit_type );
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}
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/* text chunks */
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/* if( png_get_text( input[0].read_ptr, input[0].read_info_ptr, &text_ptr, &num_text ) > 0 ) {
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printf( "Handling %d tEXt/zTXt chunks\n", num_text );
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png_set_text( write_ptr, write_info_ptr, text_ptr, num_text );
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}
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*/
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/* palette */
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if( png_get_PLTE( input[0].read_ptr, input[0].read_info_ptr, &palette, &num_palette ) ) {
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png_set_PLTE( write_ptr, write_info_ptr, palette, num_palette );
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}
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/* significant bits */
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if( png_get_sBIT( input[0].read_ptr, input[0].read_info_ptr, &sig_bit ) ) {
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png_set_sBIT( write_ptr, write_info_ptr, sig_bit );
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}
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/* transparency */
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if( png_get_tRNS( input[0].read_ptr, input[0].read_info_ptr, &trans, &num_trans, &trans_values ) ) {
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png_set_tRNS( write_ptr, write_info_ptr, trans, num_trans, trans_values );
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}
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}
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/* text chunks */
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num_text = 0;
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if( !png_get_text( input[0].read_ptr, input[0].read_info_ptr, &text_ptr, &num_text ) ) num_text = 0;
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new_text_ptr = (struct png_text_struct *)malloc( sizeof( struct png_text_struct ) * num_text + 1 );
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if( !new_text_ptr ) {
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printf( "malloc() failed\n" );
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return 1;
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}
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memcpy( new_text_ptr, text_ptr, sizeof( struct png_text_struct ) * num_text );
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snprintf( buf, 255, "SDL_anim %d %d %d", duration, width, numfiles );
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buf[255] = 0;
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new_text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
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new_text_ptr[num_text].key = "format";
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new_text_ptr[num_text].text = buf;
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new_text_ptr[num_text].text_length = strlen( buf );
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num_text++;
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png_set_text( write_ptr, write_info_ptr, new_text_ptr, num_text );
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/* write info */
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png_write_info( write_ptr, write_info_ptr );
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/* allocate buffer */
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rowbytes = png_get_rowbytes( input[0].read_ptr, input[0].read_info_ptr );
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row_buf = (png_bytep)png_malloc( write_ptr, rowbytes * numfiles );
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if( row_buf == NULL ) {
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printf( "png_malloc() failed\n" );
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return 1;
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}
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/* copy raw data */
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for( y = 0; y < height; y++ ) {
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/* grab a scanline from each file */
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here = row_buf;
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for( f = 0; f < numfiles; f++ ) {
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png_read_rows( input[f].read_ptr, (png_bytepp)&here, (png_bytepp)NULL, 1 );
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here += rowbytes;
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}
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/* write the long scanline */
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png_write_rows( write_ptr, (png_bytepp)&row_buf, 1 );
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}
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/* end io */
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for( f = 0; f < numfiles; f++ ) png_read_end( input[f].read_ptr, end_info_ptr );
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png_write_end( write_ptr, end_info_ptr );
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/* cleanup */
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png_free( write_ptr, row_buf );
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for( f = 0; f < numfiles; f++ ) {
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png_destroy_read_struct( &input[f].read_ptr, &input[f].read_info_ptr, &end_info_ptr);
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fclose( input[f].file );
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}
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png_destroy_write_struct( &write_ptr, &write_info_ptr );
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fclose( fpout );
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return 0;
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}
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