diff --git a/tests/resample_test.cpp b/tests/resample_test.cpp index c163656..3857d54 100644 --- a/tests/resample_test.cpp +++ b/tests/resample_test.cpp @@ -31,7 +31,7 @@ int main(int argc, char** argv) int n; int out_w, out_h, out_stride; -#if 0 +#if 1 test_suite(); return 0; #endif @@ -251,8 +251,49 @@ void test_channels(const char* file, float width_percent, float height_percent, free(output_data); } +void test_subpixel(const char* file, float width_percent, float height_percent, float s1, float t1) +{ + int w, h, n; + unsigned char* input_data = stbi_load(file, &w, &h, &n, 0); + + s1 = ((float)w - 1 + s1)/w; + t1 = ((float)h - 1 + t1)/h; + + int new_w = (int)(w * width_percent); + int new_h = (int)(h * height_percent); + + unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(unsigned char)); + + size_t tempmem_size = stbr_calculate_memory(w, h, new_w, new_h, 0, 0, s1, t1, n, STBR_FILTER_CATMULLROM); + void* tempmem = malloc(tempmem_size); + + stbr_resize_arbitrary(input_data, w, h, 0, output_data, new_w, new_h, 0, 0, 0, s1, t1, n, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB, tempmem, tempmem_size); + + free(tempmem); + + stbi_image_free(input_data); + + char output[200]; + sprintf(output, "test-output/subpixel-%d-%d-%f-%f-%s", new_w, new_h, s1, t1, file); + stbi_write_png(output, new_w, new_h, n, output_data, 0); + + free(output_data); +} + void test_suite() { + for (int i = 0; i < 10; i++) + test_subpixel("barbara.png", 0.5f, 0.5f, (float)i / 10, 1); + + for (int i = 0; i < 10; i++) + test_subpixel("barbara.png", 0.5f, 0.5f, 1, (float)i / 10); + + for (int i = 0; i < 10; i++) + test_subpixel("barbara.png", 2, 2, (float)i / 10, 1); + + for (int i = 0; i < 10; i++) + test_subpixel("barbara.png", 2, 2, 1, (float)i / 10); + // Channels test test_channels("barbara.png", 0.5f, 0.5f, 1); test_channels("barbara.png", 0.5f, 0.5f, 2);