// Unit tests for ResampleEffect.
-#include <GL/glew.h>
+#include <epoxy/gl.h>
+#include <gtest/gtest.h>
#include <math.h>
#include "effect_chain.h"
#include "flat_input.h"
-#include "glew.h"
-#include "gtest/gtest.h"
#include "image_format.h"
#include "resample_effect.h"
#include "test_util.h"
+namespace movit {
+
namespace {
float sinc(float x)
}
TEST(ResampleEffectTest, HeavyResampleGetsSumRight) {
- const int swidth = 1280, sheight = 720;
- const int dwidth = 36, dheight = 20;
+ // 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] = 0.5f;
+ 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] = 0.5f;
+ expected_data[y * dwidth + x] = 1.0f;
}
}
- EffectChainTester tester(NULL, dwidth, dheight, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ EffectChainTester tester(NULL, dwidth, dheight, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA32F);
ImageFormat format;
format.color_space = COLORSPACE_sRGB;
ASSERT_TRUE(resample_effect->set_int("height", dheight));
tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
- expect_equal(expected_data, out_data, dwidth, dheight, 0.001);
+ // 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);
+}
+
+TEST(ResampleEffectTest, ReadHalfPixelFromLeftAndScale) {
+ const int src_width = 4;
+ const int dst_width = 8;
+
+ float data[src_width * 1] = {
+ 1.0, 2.0, 3.0, 4.0,
+ };
+ float expected_data[dst_width * 1] = {
+ // Empirical; the real test is that we are the same for 0.499 and 0.501.
+ 1.1553, 1.7158, 2.2500, 2.7461, 3.2812, 3.8418, 4.0703, 4.0508
+ };
+ float out_data[dst_width * 1];
+
+ EffectChainTester tester(NULL, dst_width, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, src_width, 1);
+ 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", dst_width));
+ ASSERT_TRUE(resample_effect->set_int("height", 1));
+
+ // Check that we are (almost) the same no matter the rounding.
+ ASSERT_TRUE(resample_effect->set_float("left", 0.499f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(expected_data, out_data, dst_width, 1, 1.5f / 255.0f, 0.4f / 255.0f);
+
+ ASSERT_TRUE(resample_effect->set_float("left", 0.501f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(expected_data, out_data, dst_width, 1, 1.5f / 255.0f, 0.4f / 255.0f);
+}
+
+TEST(ResampleEffectTest, Zoom) {
+ const int width = 5;
+ const int height = 3;
+
+ float data[width * height] = {
+ 0.0, 0.0, 0.0, 0.0, 0.0,
+ 0.2, 0.4, 0.6, 0.4, 0.2,
+ 0.0, 0.0, 0.0, 0.0, 0.0,
+ };
+ float expected_data[width * height] = {
+ 0.0, 0.0, 0.0, 0.0, 0.0,
+ 0.4, 0.5396, 0.6, 0.5396, 0.4,
+ 0.0, 0.0, 0.0, 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("zoom_x", 2.0f));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, width, height);
+}
+
+TEST(ResampleEffectTest, VerticalZoomFromTop) {
+ const int width = 5;
+ const int height = 5;
+
+ float data[width * height] = {
+ 0.2, 0.4, 0.6, 0.4, 0.2,
+ 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, 0.0, 0.0,
+ 0.0, 0.0, 0.0, 0.0, 0.0,
+ };
+
+ // Largely empirical data; the main point is that the top line
+ // is unchanged, since that's our zooming point.
+ float expected_data[width * height] = {
+ 0.2000, 0.4000, 0.6000, 0.4000, 0.2000,
+ 0.1389, 0.2778, 0.4167, 0.2778, 0.1389,
+ 0.0600, 0.1199, 0.1798, 0.1199, 0.0600,
+ 0.0000, 0.0000, 0.0000, 0.0000, 0.0000,
+ -0.0229, -0.0459, -0.0688, -0.0459, -0.0229,
+ };
+ 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("zoom_y", 3.0f));
+ ASSERT_TRUE(resample_effect->set_float("zoom_center_y", 0.5f / height));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, width, height);
}
+} // namespace movit