87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
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------ libtthimage ------
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PNG aka "portable network graphics"s.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <png.h>
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#include <zlib.h>
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#undef DEBUG_LEVEL
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#define DEBUG_LEVEL 1
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#include "../tthimage.h"
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/*
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* http://www.libpng.org/pub/png/pngbook.html
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*/
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/*::------------------------------------------------------------------::*/
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void write_png_version_info(void)
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{
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fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
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PNG_LIBPNG_VER_STRING, png_libpng_ver);
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fprintf(stderr, " Compiled with zlib %s; using zlib %s.\n",
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ZLIB_VERSION, zlib_version);
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}
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/*::------------------------------------------------------------------::*/
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Image_Desc * Image_PNG_alloc_load(char *fname, int k)
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{
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( '%s' %d )\n", __func__, fname, k);
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write_png_version_info();
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#endif
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return NULL;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* http://zarb.org/~gc/html/libpng.html
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* https://gist.github.com/niw/5963798
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*/
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int Image_save_as_PNG(Image_Desc *img, char *fname, int p1, int p2)
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{
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FILE *fp;
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int x, y, foo;
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png_structp png;
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png_infop info;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p '%s' %d %d )\n", __func__, img, fname, p1, p2);
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write_png_version_info();
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#endif
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fp = fopen(fname, "wb");
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if (NULL == fp) {
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perror(fname);
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return BASIC_IO_WR_ERR;
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}
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png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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info = png_create_info_struct(png);
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if (setjmp(png_jmpbuf(png))) abort();
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png_init_io(png, fp);
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png_set_IHDR( png,
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info,
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img->width, img->height,
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8,
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PNG_COLOR_TYPE_RGBA,
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PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT );
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png_write_info(png, info);
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return FULL_NUCKED;
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}
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/*::------------------------------------------------------------------::*/
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