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/**
* File: compare_avif_to_png
*
* Thorough check for AVIF encoding and decoding.
* This test reqiures a set of PNG images that have been losslessly encoded to AVIFs.
* For each such image, we encode the PNG into an AVIF, with the GD format as an intermediary,
* then compare the resulting AVIF with the original PNG.
*
* We then do this process in reverse, encoding the AVIF into a PNG,
* and compare the resulting PNG with the original AVIF.
*
* We report any discrepancies in the images, or any other errors that may occur.
*/
#include <stdio.h>
#include <string.h>
#include "gd.h"
#include "gdtest.h"
int main() {
FILE *fp;
gdImagePtr imFromPng = NULL, imFromAvif = NULL;
void *avifImDataPtr = NULL, *pngImDataPtr = NULL;
int size;
char pngFilename[100], avifFilename[100], *pngFilePath;
char errMsg[4096];
static const char * const filenames[] = {"baboon", "dice_with_alpha", "plum_blossom_12bit", "sunset"};
const int filesCount = sizeof(filenames) / sizeof(filenames[0]);
for (int i = 0; i < filesCount; i++) {
// First, encode each PNG into an AVIF (with the GD format as an intermediary),
// then compare the result with the original PNG.
sprintf(pngFilename, "%s.png", filenames[i]);
fp = gdTestFileOpen2("avif", pngFilename);
imFromPng = gdImageCreateFromPng(fp);
fclose(fp);
strcat(strcpy(errMsg, filenames[i]), ".png: gdImageCreateFromPng failed\n");
if (!gdTestAssertMsg(imFromPng != NULL, errMsg))
goto avif2png;
strcat(strcpy(errMsg, filenames[i]), ": gdImageAvifPtrEx failed\n");
avifImDataPtr = gdImageAvifPtrEx(imFromPng, &size, 100, 0);
if (!gdTestAssertMsg(avifImDataPtr != NULL, errMsg))
goto avif2png;
strcat(strcpy(errMsg, filenames[i]), ": gdImageCreateFromAvifPtr failed\n");
imFromAvif = gdImageCreateFromAvifPtr(size, avifImDataPtr);
if (!gdTestAssertMsg(imFromAvif != NULL, errMsg))
goto avif2png;
strcat(strcpy(errMsg, filenames[i]), ".png: Encoded AVIF image did not match original PNG\n");
gdTestAssertMsg(gdAssertImageEquals(imFromPng, imFromAvif), errMsg);
// Then, decode each AVIF into a GD format, and compare that with the orginal PNG.
avif2png:
// Skip this reverse test for now, until we can find images that encode to PNGs losslessly.
if (0) {
sprintf(avifFilename, "%s.avif", filenames[i]);
fp = gdTestFileOpen2("avif", avifFilename);
imFromAvif = gdImageCreateFromAvif(fp);
fclose(fp);
strcat(strcpy(errMsg, filenames[i]), ".avif: gdImageCreateFromAvif failed\n");
if (!gdTestAssertMsg(imFromAvif != NULL, errMsg))
continue;
strcat(strcpy(errMsg, filenames[i]), ".avif: Encoded PNG image did not match original AVIF\n");
pngFilePath = gdTestFilePath2("avif", pngFilename);
gdTestAssertMsg(gdAssertImageEqualsToFile(pngFilePath, imFromAvif), errMsg);
free(pngFilePath);
}
}
if (imFromPng)
gdImageDestroy(imFromPng);
if (imFromAvif)
gdImageDestroy(imFromAvif);
if (avifImDataPtr)
gdFree(avifImDataPtr);
if (pngImDataPtr)
gdFree(pngImDataPtr);
return gdNumFailures();
}
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