Add a unit test for luma interpolation in YCbCr422InterleavedInput.

diff --git a/ycbcr_422interleaved_input_test.cpp b/ycbcr_422interleaved_input_test.cpp
index ac61ec1857f3cfd142f68d7c245bb39a728e4ff2..290885e10156de4cf5f739a1700781a44f17fe6c 100644 (file)
--- a/ycbcr_422interleaved_input_test.cpp
+++ b/ycbcr_422interleaved_input_test.cpp
@@ -7,6 +7,7 @@
 #include "gtest/gtest.h"
 #include "test_util.h"
 #include "util.h"
 #include "gtest/gtest.h"
 #include "test_util.h"
 #include "util.h"

+#include "resize_effect.h"

 #include "ycbcr_422interleaved_input.h"
 
 namespace movit {
 #include "ycbcr_422interleaved_input.h"
 
 namespace movit {


@@ -62,6 +63,56 @@ TEST(YCbCr422InterleavedInputTest, Simple422) {
        expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
 }
 
        expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
 }
 

+TEST(YCbCr422InterleavedInputTest, LumaLinearInterpolation) {
+       const int width = 4;
+       const int height = 1;
+       const int out_width = width * 3;
+
+       // Black, white, black and then gray.
+       unsigned char uyvy[width * height * 2] = {
+               /*U=*/128, /*Y=*/ 16,
+               /*V=*/128, /*Y=*/235,
+               /*U=*/128, /*Y=*/ 16,
+               /*V=*/128, /*Y=*/128,
+       };
+
+       float expected_data[out_width * height] = {
+               0.0, /**/0.0, 0.333, 0.667, /**/1.0, 0.667, 0.333, /**/0.0, 0.167, 0.333, /**/0.5, 0.5
+       };
+       float out_data[out_width * height];
+
+       EffectChainTester tester(NULL, out_width, height);
+
+       ImageFormat format;
+       format.color_space = COLORSPACE_sRGB;
+       format.gamma_curve = GAMMA_sRGB;
+
+       YCbCrFormat ycbcr_format;
+       ycbcr_format.luma_coefficients = YCBCR_REC_601;
+       ycbcr_format.full_range = false;
+       ycbcr_format.chroma_subsampling_x = 2;
+       ycbcr_format.chroma_subsampling_y = 1;
+       ycbcr_format.cb_x_position = 0.0f;  // Doesn't really matter here, since U/V are constant.
+       ycbcr_format.cb_y_position = 0.5f;
+       ycbcr_format.cr_x_position = 0.0f;
+       ycbcr_format.cr_y_position = 0.5f;
+
+       YCbCr422InterleavedInput *input = new YCbCr422InterleavedInput(format, ycbcr_format, width, height);
+       input->set_pixel_data(uyvy);
+       tester.get_chain()->add_input(input);
+
+       ResizeEffect *upscale = new ResizeEffect();
+       ASSERT_TRUE(upscale->set_int("width", out_width));
+       ASSERT_TRUE(upscale->set_int("height", height));
+       tester.get_chain()->add_effect(upscale);
+
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
+
+       // Y'CbCr isn't 100% accurate (the input values are rounded),
+       // so we need some leeway.
+       expect_equal(expected_data, out_data, out_width, height, 0.025, 0.002);
+}
+

 // Adapted from the YCbCrInput test of the same name.
 TEST(YCbCr422InterleavedInputTest, DifferentCbAndCrPositioning) {
        const int width = 4;
 // Adapted from the YCbCrInput test of the same name.
 TEST(YCbCr422InterleavedInputTest, DifferentCbAndCrPositioning) {
        const int width = 4;