76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#define STBI_WINDOWS_UTF8
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#ifdef _WIN32
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#define WIN32 // what stb.h checks
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#pragma comment(lib, "advapi32.lib")
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#endif
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#define STB_IMAGE_IMPLEMENTATION
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#include "stb_image.h"
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#define STB_DEFINE
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#include "deprecated/stb.h"
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static unsigned int fnv1a_hash32(const stbi_uc *bytes, size_t len)
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{
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unsigned int hash = 0x811c9dc5;
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unsigned int mul = 0x01000193;
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size_t i;
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for (i = 0; i < len; ++i)
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hash = (hash ^ bytes[i]) * mul;
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return hash;
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}
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// The idea for this test is to leave pngsuite/ref_results.csv checked in,
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// and then you can run this test after making PNG loader changes. If the
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// ref results change (as per git diff), confirm that the change was
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// intentional. If so, commit them as well; if not, undo.
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int main()
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{
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char **files;
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FILE *csv_file;
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int i;
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files = stb_readdir_recursive("pngsuite", "*.png");
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if (!files) {
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fprintf(stderr, "pngsuite files not found!\n");
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return 1;
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}
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// sort files by name
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qsort(files, stb_arr_len(files), sizeof(char*), stb_qsort_strcmp(0));
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csv_file = fopen("pngsuite/ref_results.csv", "w");
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if (!csv_file) {
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fprintf(stderr, "error opening ref results for writing!\n");
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stb_readdir_free(files);
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return 1;
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}
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fprintf(csv_file, "filename,width,height,ncomp,error,hash\n");
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for (i = 0; i < stb_arr_len(files); ++i) {
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char *filename = files[i];
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int width, height, ncomp;
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stbi_uc *pixels = stbi_load(filename, &width, &height, &ncomp, 0);
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const char *error = "";
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unsigned int hash = 0;
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if (!pixels)
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error = stbi_failure_reason();
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else {
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hash = fnv1a_hash32(pixels, width * height * ncomp);
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stbi_image_free(pixels);
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}
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fprintf(csv_file, "%s,%d,%d,%d,%s,0x%08x\n", filename, width, height, ncomp, error, hash);
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}
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fclose(csv_file);
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stb_readdir_free(files);
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}
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