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Test channels.

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This commit is contained in:
Jorge Rodriguez 2014-07-30 09:41:41 -07:00
parent 985ac75251
commit c5de2f3298
1 changed files with 44 additions and 0 deletions
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44
tests/resample_test.cpp
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@ -210,8 +210,52 @@ void test_float(const char* file, float width_percent, float height_percent, stb
free(output_data);
}
void test_channels(char* file, float width_percent, float height_percent, int channels)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
unsigned char* channels_data = (unsigned char*)malloc(w * h * channels * sizeof(unsigned char));
for (int i = 0; i < w * h; i++)
{
int input_position = i * n;
int output_position = i * channels;
for (int c = 0; c < channels; c++)
channels_data[output_position + c] = input_data[input_position + stbr__min(c, n)];
}
unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * channels * sizeof(unsigned char));
stbr_resize_srgb_uint8(channels_data, w, h, output_data, new_w, new_h, channels, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP);
free(channels_data);
stbi_image_free(input_data);
char output[200];
sprintf(output, "test-output/channels-%d-%d-%d-%s", channels, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, channels, output_data, 0);
free(output_data);
}
void test_suite()
{
// Channels test
test_channels("barbara.png", 0.5f, 0.5f, 1);
test_channels("barbara.png", 0.5f, 0.5f, 2);
test_channels("barbara.png", 0.5f, 0.5f, 3);
test_channels("barbara.png", 0.5f, 0.5f, 4);
test_channels("barbara.png", 2, 2, 1);
test_channels("barbara.png", 2, 2, 2);
test_channels("barbara.png", 2, 2, 3);
test_channels("barbara.png", 2, 2, 4);
// Edge behavior tests
resize_image("hgradient.png", 2, 2, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_LINEAR, "test-output/hgradient-clamp.png");
resize_image("hgradient.png", 2, 2, STBR_FILTER_CATMULLROM, STBR_EDGE_WRAP, STBR_COLORSPACE_LINEAR, "test-output/hgradient-wrap.png");