Various fixes for wide color gamut rendering
This CL addresses multiple issues:
- A logic issue where the wide gamut color mode was not set at the right time
- The presence of scRGB surfaces was not detected
- The sRGB to Display P3 matrix was transposed
- The color matrix was applied in gamma space instead of linear space*
- The GPU code path was doing a division by w for each pixel when a
color transform is set, which shouldn't be necessary (the code now
checks that the matrix has the expected form)
- Incorrect comment
- Dead code in Description.cpp (mDirtyUniforms was never used)
- Screenshots were taken using the last render engine configuration,
the configuration is now properly set every time
* This can in theory cause a discrepancy when we switch to/from hardware
composer mode. I was not able to create a visible discrepancy in practice
using Night Light, color blindness compensation modes and color inversion.
More importantly, how/where the hardware composer applies the color
transform is not specified: it could be gamma or linear space, before or
after the hardware color LUT. We'll address this in a future CL if needed.
In addition, this code assumes that fp16 surfaces are encoded in non-linear
space (scRGB-nl instead of scRGB) but we do not have EGL/Vulkan extensions
to specify this behavior. We need to address this as well
This CL also fixes potential divides by 0 in the GPU code path.
Bug: 29940137
Test: CtsUiRenderingTestsCases, CtsGraphicsTestCases
Change-Id: I9ae15850f8b9d48c39ebc2724ca3da202be9b008
diff --git a/services/surfaceflinger/RenderEngine/ProgramCache.h b/services/surfaceflinger/RenderEngine/ProgramCache.h
index 1fa53d3..5b0fbcd 100644
--- a/services/surfaceflinger/RenderEngine/ProgramCache.h
+++ b/services/surfaceflinger/RenderEngine/ProgramCache.h
@@ -69,6 +69,10 @@
COLOR_MATRIX_OFF = 0x00000000,
COLOR_MATRIX_ON = 0x00000020,
COLOR_MATRIX_MASK = 0x00000020,
+
+ WIDE_GAMUT_OFF = 0x00000000,
+ WIDE_GAMUT_ON = 0x00000040,
+ WIDE_GAMUT_MASK = 0x00000040,
};
inline Key() : mKey(0) { }
@@ -97,10 +101,13 @@
inline bool hasColorMatrix() const {
return (mKey & COLOR_MATRIX_MASK) == COLOR_MATRIX_ON;
}
+ inline bool isWideGamut() const {
+ return (mKey & WIDE_GAMUT_MASK) == WIDE_GAMUT_ON;
+ }
// this is the definition of a friend function -- not a method of class Needs
friend inline int strictly_order_type(const Key& lhs, const Key& rhs) {
- return (lhs.mKey < rhs.mKey) ? 1 : 0;
+ return (lhs.mKey < rhs.mKey) ? 1 : 0;
}
};