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-rw-r--r--png.c108
1 files changed, 0 insertions, 108 deletions
diff --git a/png.c b/png.c
index 99a80ef..a2917f5 100644
--- a/png.c
+++ b/png.c
@@ -114,111 +114,3 @@ void write_png(FILE *file, void *image, int width, int height, flam3_img_comment
}
-#define SIG_CHECK_SIZE 8
-
-unsigned char *read_png(FILE *ifp, int *width, int *height) {
- unsigned char sig_buf [SIG_CHECK_SIZE];
- png_struct *png_ptr;
- png_info *info_ptr;
- png_byte **png_image = NULL;
- unsigned int linesize, x, y;
- unsigned char *p, *q;
-
- if (fread (sig_buf, 1, SIG_CHECK_SIZE, ifp) != SIG_CHECK_SIZE) {
- fprintf (stderr, "input file empty or too short\n");
- return 0;
- }
- if (png_sig_cmp (sig_buf, (png_size_t) 0, (png_size_t) SIG_CHECK_SIZE) != 0) {
- fprintf (stderr, "input file not a PNG file\n");
- return 0;
- }
-
- png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
- if (png_ptr == NULL) {
- fprintf (stderr, "cannot allocate LIBPNG structure\n");
- return 0;
- }
- if (setjmp(png_jmpbuf(png_ptr))) {
- if (png_image) {
- for (y = 0 ; y < png_get_image_height(png_ptr, info_ptr) ; y++)
- free (png_image[y]);
- free (png_image);
- }
- png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
- perror("reading file");
- return 0;
- }
- info_ptr = png_create_info_struct (png_ptr);
- if (info_ptr == NULL) {
- png_destroy_read_struct (&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
- fprintf (stderr, "cannot allocate LIBPNG structures\n");
- return 0;
- }
-
- png_init_io (png_ptr, ifp);
- png_set_sig_bytes (png_ptr, SIG_CHECK_SIZE);
- png_read_info (png_ptr, info_ptr);
-
- if (8 != png_get_bit_depth(png_ptr, info_ptr)) {
- fprintf(stderr, "bit depth type must be 8, not %d.\n",
- png_get_bit_depth(png_ptr, info_ptr));
- return 0;
- }
-
- *width = png_get_image_width(png_ptr, info_ptr);
- *height = png_get_image_height(png_ptr, info_ptr);
- p = q = malloc(4 * *width * *height);
- png_image = (png_byte **)malloc (*height * sizeof (png_byte*));
-
- linesize = *width;
- switch (png_get_color_type(png_ptr, info_ptr)) {
- case PNG_COLOR_TYPE_RGB:
- linesize *= 3;
- break;
- case PNG_COLOR_TYPE_RGBA:
- linesize *= 4;
- break;
- default:
- fprintf(stderr, "color type must be RGB or RGBA not %d.\n",
- png_get_color_type(png_ptr, info_ptr));
- return 0;
- }
-
- for (y = 0 ; y < *height ; y++) {
- png_image[y] = malloc (linesize);
- }
- png_read_image (png_ptr, png_image);
- png_read_end (png_ptr, info_ptr);
-
- for (y = 0 ; y < *height ; y++) {
- unsigned char *s = png_image[y];
- for (x = 0 ; x < *width ; x++) {
-
- switch (png_get_color_type(png_ptr, info_ptr)) {
- case PNG_COLOR_TYPE_RGB:
- p[0] = s[0];
- p[1] = s[1];
- p[2] = s[2];
- p[3] = 255;
- s += 3;
- p += 4;
- break;
- case PNG_COLOR_TYPE_RGBA:
- p[0] = s[0];
- p[1] = s[1];
- p[2] = s[2];
- p[3] = s[3];
- s += 4;
- p += 4;
- break;
- }
- }
- }
-
- for (y = 0 ; y < *height ; y++)
- free (png_image[y]);
- free (png_image);
- png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp)NULL);
-
- return q;
-}