Allow storing values in intermediate framebuffers as sqrt(x).

[movit] / test_util.cpp

diff --git a/test_util.cpp b/test_util.cpp
index b377309638114057f2d99a56c852ee010bebb18f..9d12a120f16cc8863defadf3151a0c2d30a4f653 100644 (file)
--- a/test_util.cpp
+++ b/test_util.cpp
@@ -46,9 +46,8 @@ void vertical_flip(T *data, unsigned width, unsigned height)
 
 EffectChainTester::EffectChainTester(const float *data, unsigned width, unsigned height,
                                      MovitPixelFormat pixel_format, Colorspace color_space, GammaCurve gamma_curve,
-                                     GLenum framebuffer_format,
-                                     GLenum intermediate_format)
-       : chain(width, height, get_static_pool(), intermediate_format),
+                                     GLenum framebuffer_format)
+       : chain(width, height, get_static_pool()),
          width(width),
          height(height),
          framebuffer_format(framebuffer_format),
@@ -351,4 +350,24 @@ void test_accuracy(const float *expected, const float *result, unsigned num_valu
        EXPECT_LT(rms, rms_limit);
 }
 
+double srgb_to_linear(double x)
+{
+       // From the Wikipedia article on sRGB.
+       if (x < 0.04045) {
+               return x / 12.92;
+       } else {
+               return pow((x + 0.055) / 1.055, 2.4);
+       }
+}
+
+double linear_to_srgb(double x)
+{
+       // From the Wikipedia article on sRGB.
+       if (x < 0.0031308) {
+               return 12.92 * x;
+       } else {
+               return 1.055 * pow(x, 1.0 / 2.4) - 0.055;
+       }
+}
+
 }  // namespace movit