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image.cpp, always use black for png transparency color

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dinkc64 2024-05-17 00:37:35 -04:00
parent 4391732d06
commit d92ecce458
1 changed files with 26 additions and 1 deletions
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27
src/burner/image.cpp
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@ -493,7 +493,7 @@ INT32 PNGLoad(IMAGE* img, FILE* fp, INT32 nPreset)
int fmt = SPNG_FMT_RGB8;
ret = spng_decoded_image_size(ctx, fmt, &image_size);
ret = spng_decode_image(ctx, NULL, 0, fmt, SPNG_DECODE_PROGRESSIVE);
ret = spng_decode_image(ctx, NULL, 0, fmt, SPNG_DECODE_PROGRESSIVE | SPNG_DECODE_TRNS );
image_width_bytes = image_size / ihdr.height; // it's the width * 3 (1 for each RGB)
@ -508,6 +508,16 @@ INT32 PNGLoad(IMAGE* img, FILE* fp, INT32 nPreset)
struct spng_row_info row_info = {0};
// deal with transparency that decodes to non-black
int trans_to_black = 0;
struct spng_plte plte;
struct spng_trns trns;
trans_to_black =
(ihdr.color_type == SPNG_COLOR_TYPE_INDEXED) &&
(spng_get_plte(ctx, &plte) == 0) &&
(spng_get_trns(ctx, &trns) == 0);
do {
if ((ret = spng_get_row_info(ctx, &row_info)) != 0) break;
@ -518,6 +528,21 @@ INT32 PNGLoad(IMAGE* img, FILE* fp, INT32 nPreset)
int g = temp_img.rowptr[row_info.row_num][i + 1];
int b = temp_img.rowptr[row_info.row_num][i + 2];
if (trans_to_black) {
for(int j = 0; j < trns.n_type3_entries; j++)
{
if(trns.type3_alpha[j] < 20 &&
plte.entries[trns.type3_alpha[j]].red == r &&
plte.entries[trns.type3_alpha[j]].green == g &&
plte.entries[trns.type3_alpha[j]].blue == b)
{
r = 0;
g = 0;
b = 0;
}
}
}
temp_img.rowptr[row_info.row_num][i + 0] = b;
temp_img.rowptr[row_info.row_num][i + 1] = g;
temp_img.rowptr[row_info.row_num][i + 2] = r;