// Unit tests for ResampleEffect.
-#include "test_util.h"
-#include "gtest/gtest.h"
-#include "resample_effect.h"
+#include <epoxy/gl.h>
+#include <gtest/gtest.h>
+#include <math.h>
+
+#include "effect_chain.h"
#include "flat_input.h"
+#include "image_format.h"
+#include "resample_effect.h"
+#include "test_util.h"
+
+namespace movit {
namespace {
}
}
}
+
+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);
+}
+
+} // namespace movit