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@ -384,18 +384,21 @@ void test_subpixel(const char* file, float width_percent, float height_percent, |
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free(output_data); |
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} |
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unsigned char* pixel(unsigned char* buffer, int x, int y, int c, int w, int n) |
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unsigned int* pixel(unsigned int* buffer, int x, int y, int c, int w, int n) |
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{ |
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return &buffer[y*w*n + x*n + c]; |
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} |
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void test_premul() |
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{ |
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unsigned char input[2 * 2 * 4]; |
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unsigned char output[1 * 1 * 4]; |
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unsigned int input[2 * 2 * 4]; |
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unsigned int output[1 * 1 * 4]; |
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unsigned int output2[2 * 2 * 4]; |
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memset(input, 0, sizeof(input)); |
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// First a test to make sure premul is working properly.
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// Top left - solid red
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*pixel(input, 0, 0, 0, 2, 4) = 255; |
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*pixel(input, 0, 0, 3, 2, 4) = 255; |
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@ -412,18 +415,50 @@ void test_premul() |
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*pixel(input, 1, 1, 1, 2, 4) = 255; |
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*pixel(input, 1, 1, 3, 2, 4) = 25; |
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stbir_resize_uint8_generic(input, 2, 2, 0, output, 1, 1, 0, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context); |
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stbir_resize(input, 2, 2, 0, output, 1, 1, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context); |
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float r = 1.0f; |
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float g = 1.0f; |
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float ra = 1.0; |
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float ga = (float)25 / 255; |
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float r = (float)255 / 4294967296; |
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float g = (float)255 / 4294967296; |
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float ra = (float)255 / 4294967296; |
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float ga = (float)25 / 4294967296; |
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float a = (ra + ga) / 2; |
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STBIR_ASSERT(output[0] == (int)(r * ra / 2 / a * 255 + 0.5f)); // 232
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STBIR_ASSERT(output[1] == (int)(g * ga / 2 / a * 255 + 0.5f)); // 23
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STBIR_ASSERT(output[0] == (int)(r * ra / 2 / a * 4294967296 + 0.5f)); // 232
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STBIR_ASSERT(output[1] == (int)(g * ga / 2 / a * 4294967296 + 0.5f)); // 23
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STBIR_ASSERT(output[2] == 0); |
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STBIR_ASSERT(output[3] == (int)(a * 255 + 0.5f)); // 140
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STBIR_ASSERT(output[3] == (int)(a * 4294967296 + 0.5f)); // 140
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// Now a test to make sure it doesn't clobber existing values.
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// Top right - completely transparent green
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*pixel(input, 1, 0, 1, 2, 4) = 255; |
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*pixel(input, 1, 0, 3, 2, 4) = 0; |
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// Bottom right - completely transparent green
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*pixel(input, 1, 1, 1, 2, 4) = 255; |
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*pixel(input, 1, 1, 3, 2, 4) = 0; |
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stbir_resize(input, 2, 2, 0, output2, 2, 2, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context); |
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STBIR_ASSERT(*pixel(output2, 0, 0, 0, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 0, 0, 1, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 0, 0, 2, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 0, 0, 3, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 0, 1, 0, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 0, 1, 1, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 0, 1, 2, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 0, 1, 3, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 1, 0, 0, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 1, 0, 1, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 1, 0, 2, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 1, 0, 3, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 1, 1, 0, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 1, 1, 1, 2, 4) == 255); |
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STBIR_ASSERT(*pixel(output2, 1, 1, 2, 2, 4) == 0); |
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STBIR_ASSERT(*pixel(output2, 1, 1, 3, 2, 4) == 0); |
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} |
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// test that splitting a pow-2 image into tiles produces identical results
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