X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=resample_effect_test.cpp;h=e4b9439ffffad9211c9b1c99d91e544e5e1a1fe0;hp=a9c6923e269d202b0a7a939e19012dc9e7dfe33f;hb=8a7bc428c1af91981bf8dfd73495acb2ebfaab6b;hpb=37f56fcbe571b2322243f6de59494bf9e0cbb37a

diff --git a/resample_effect_test.cpp b/resample_effect_test.cpp
index a9c6923..e4b9439 100644
--- a/resample_effect_test.cpp
+++ b/resample_effect_test.cpp
@@ -1,15 +1,17 @@
 // Unit tests for ResampleEffect.
 
+#include <epoxy/gl.h>
+#include <gtest/gtest.h>
 #include <math.h>
-#include <iomanip>
 
 #include "effect_chain.h"
 #include "flat_input.h"
-#include "gtest/gtest.h"
 #include "image_format.h"
 #include "resample_effect.h"
 #include "test_util.h"
 
+namespace movit {
+
 namespace {
 
 float sinc(float x)
@@ -165,3 +167,141 @@ TEST(ResampleEffectTest, UpscaleByThreeGetsCorrectPixelCenters) {
 		}
 	}
 }
+
+TEST(ResampleEffectTest, HeavyResampleGetsSumRight) {
+	// Do only one resample pass, more specifically the last one, which goes to
+	// our fp32 output. This allows us to analyze the precision without intermediate
+	// fp16 rounding.
+	const int swidth = 1, sheight = 1280;
+	const int dwidth = 1, dheight = 64;
+
+	float data[swidth * sheight], out_data[dwidth * dheight], expected_data[dwidth * dheight];
+	for (int y = 0; y < sheight; ++y) {
+		for (int x = 0; x < swidth; ++x) {
+			data[y * swidth + x] = 1.0f;
+		}
+	}
+	for (int y = 0; y < dheight; ++y) {
+		for (int x = 0; x < dwidth; ++x) {
+			expected_data[y * dwidth + x] = 1.0f;
+		}
+	}
+
+	EffectChainTester tester(NULL, dwidth, dheight, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA32F);
+
+	ImageFormat format;
+	format.color_space = COLORSPACE_sRGB;
+	format.gamma_curve = GAMMA_LINEAR;
+
+	FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, swidth, sheight);
+	input->set_pixel_data(data);
+
+	tester.get_chain()->add_input(input);
+	Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+	ASSERT_TRUE(resample_effect->set_int("width", dwidth));
+	ASSERT_TRUE(resample_effect->set_int("height", dheight));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	// Require that we are within 10-bit accuracy. Note that this limit is for
+	// one pass only, but the limit is tight enough that it should be good enough
+	// for 10-bit accuracy even after two passes.
+	expect_equal(expected_data, out_data, dwidth, dheight, 0.1 / 1023.0);
+}
+
+TEST(ResampleEffectTest, ReadWholePixelFromLeft) {
+	const int size = 5;
+
+	float data[size * size] = {
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 1.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+	};
+	float expected_data[size * size] = {
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 1.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+	};
+	float out_data[size * size];
+
+	EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+	Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+	ASSERT_TRUE(resample_effect->set_int("width", size));
+	ASSERT_TRUE(resample_effect->set_int("height", size));
+	ASSERT_TRUE(resample_effect->set_float("left", 1.0f));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, size, size);
+}
+
+TEST(ResampleEffectTest, ReadQuarterPixelFromLeft) {
+	const int size = 5;
+
+	float data[size * size] = {
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 1.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+	};
+
+	float expected_data[size * size] = {
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+
+		// sin(x*pi)/(x*pi) * sin(x*pi/3)/(x*pi/3) for
+		// x = -1.75, -0.75, 0.25, 1.25, 2.25.
+		// Note that the weight is mostly on the left side.
+		-0.06779, 0.27019, 0.89007, -0.13287, 0.03002,
+
+		0.0, 0.0, 0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0, 0.0, 0.0,
+	};
+	float out_data[size * size];
+
+	EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+	Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+	ASSERT_TRUE(resample_effect->set_int("width", size));
+	ASSERT_TRUE(resample_effect->set_int("height", size));
+	ASSERT_TRUE(resample_effect->set_float("left", 0.25f));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, size, size);
+}
+
+TEST(ResampleEffectTest, ReadQuarterPixelFromTop) {
+	const int width = 3;
+	const int height = 5;
+
+	float data[width * height] = {
+		0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0,
+		1.0, 0.0, 0.0,
+		0.0, 0.0, 0.0,
+		0.0, 0.0, 0.0,
+	};
+
+	// See ReadQuarterPixelFromLeft for explanation of the data.
+	float expected_data[width * height] = {
+		-0.06779, 0.0, 0.0,
+		 0.27019, 0.0, 0.0,
+		 0.89007, 0.0, 0.0,
+		-0.13287, 0.0, 0.0,
+		 0.03002, 0.0, 0.0,
+	};
+	float out_data[width * height];
+
+	EffectChainTester tester(data, width, height, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+	Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+	ASSERT_TRUE(resample_effect->set_int("width", width));
+	ASSERT_TRUE(resample_effect->set_int("height", height));
+	ASSERT_TRUE(resample_effect->set_float("top", 0.25f));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, width, height);
+}
+
+}  // namespace movit