163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/*
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* Lecture des images PNG
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pnglite.h>
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#include "../floatimg.h"
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/* --------------------------------------------------------------------- */
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/*
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* warning : this func has been tested only with
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* RGB (3x8bits) PNG files
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*/
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int fimg_create_from_png(char *filename, FloatImg *fimg)
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{
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png_t png;
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int foo, idx;
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unsigned char *datas, *ptr;
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int datasize;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %-25s ( '%s' %p )\n", __func__, filename, fimg);
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#endif
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memset(&png, 0, sizeof(png_t));
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png_init(NULL, NULL); /* this is VITAL ! */
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foo = png_open_file_read(&png, filename);
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if (PNG_NO_ERROR != foo) {
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fprintf(stderr, "%s open_file '%s' -> %d\n", __func__, filename, foo);
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return foo;
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}
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#if DEBUG_LEVEL > 1
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fprintf(stderr, "%s opened\n", filename);
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#endif
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datasize = png.width * png.height * png.bpp;
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if ( 3 != png.bpp ) {
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fprintf(stderr, "format %d of '%s' not supported\n",
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png.color_type, filename);
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return -21;
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}
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#if DEBUG_LEVEL
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printf("\t%s is %d x %d\n", filename, png.width, png.height);
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printf("\tdatalen %d\n", png.png_datalen);
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printf("\tcolor type %d\n", png.color_type);
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printf("\tbyte/pixel %d\n", png.bpp);
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printf("\tdatasize %d\n", datasize);
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puts(""); png_print_info(&png); puts("");
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#endif
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datas = malloc(datasize);
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if (NULL==datas) {
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fprintf(stderr, "%s : fatal memory failure\n", __func__);
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exit(1);
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}
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memset(fimg, 0, sizeof(FloatImg));
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foo = fimg_create(fimg, png.width, png.height, 3);
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if (foo) {
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fprintf(stderr, "can't create fimg\n");
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exit(1);
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}
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foo = png_get_data(&png, datas);
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if (PNG_NO_ERROR != foo) {
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fprintf(stderr, "error in '%s' : read png -> %d\n",
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__func__, foo);
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return foo;
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}
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ptr = datas;
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for (idx=0; idx<png.width * png.height; idx++) {
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fimg->R[idx] = (float)*ptr++;
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fimg->G[idx] = (float)*ptr++;
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fimg->B[idx] = (float)*ptr++;
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}
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free(datas);
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png_close_file(&png);
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// fprintf(stderr, "png closed...\n");
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return foo;
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}
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/* --------------------------------------------------------------------- */
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/*
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* warning : this func has been tested only with
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* RGB (3x8bits) PNG files
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*/
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int fimg_load_from_png(char *filename, FloatImg *fimg)
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{
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png_t png;
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int foo, idx, datasize;
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unsigned char *datas, *ptr;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %-25s ( '%s' %p )\n", __func__, filename, fimg);
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#endif
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memset(&png, 0, sizeof(png_t));
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png_init(NULL, NULL); /* this is VITAL ! */
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foo = png_open_file_read(&png, filename);
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if (PNG_NO_ERROR != foo) {
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#if DEBUG_LEVEL
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fprintf(stderr, "open png -> %d\n", foo);
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#endif
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return foo;
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}
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// puts(""); png_print_info(&png); puts("");
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if ( 3 != png.bpp ) { /* TO BE PATCHED */
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fprintf(stderr, "format of '%s' not supported\n", filename);
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return -21;
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}
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/* check if floatimg and PNG have the same size */
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if ((fimg->width != png.width) || (fimg->height != png.height)) {
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fprintf(stderr, "%s : fatal error on images sizes\n", __func__);
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exit(1);
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}
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datasize = png.width * png.height * png.bpp;
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datas = malloc(datasize);
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if (NULL==datas) {
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fprintf(stderr, "%s : fatal memory failure\n", __func__);
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exit(1);
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}
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foo = png_get_data(&png, datas);
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if (PNG_NO_ERROR != foo) {
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fprintf(stderr, "error in '%s' : read png -> %d\n",
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__func__, foo);
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return foo;
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}
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ptr = datas;
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for (idx=0; idx<png.width * png.height; idx++) {
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fimg->R[idx] = (float)*ptr++;
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fimg->G[idx] = (float)*ptr++;
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fimg->B[idx] = (float)*ptr++;
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}
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free(datas);
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png_close_file(&png);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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int fimg_save_as_png(FloatImg *src, char *outname, int flags)
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{
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png_t png;
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return -1;
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}
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/* --------------------------------------------------------------------- */
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