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33 lines
581 B
C
33 lines
581 B
C
#include <stddef.h>
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#include <stdint.h>
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#include "lodepng.h"
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#include "png.h"
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#include "ui.h"
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u8 *PNG_Decompress(const u8 *png, size_t png_len, size_t *w, size_t *h)
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{
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u8 *img;
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u32 res;
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size_t w_, h_;
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res = lodepng_decode24(&img, &w_, &h_, png, png_len);
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if (res) {
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ShowPrompt(false, "PNG error: %s", lodepng_error_text(res));
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return NULL;
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}
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// maybe process in batches of 3 pixels / 12 bytes at a time?
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for (size_t i = 0; i < (w_ * h_ * 3); i += 3) {
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u8 c = img[i];
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img[i] = img[i + 2];
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img[i + 2] = c;
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}
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if (w) *w = w_;
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if (h) *h = h_;
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return img;
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}
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