Implement sRGB conversion in the blitter.

Note that glReadPixels() does not perform sRGB conversion.

Change-Id: I3f9089b79652ce42cb5695d5b6a8ce92d15c27a8
Reviewed-on: https://swiftshader-review.googlesource.com/14492
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Renderer/Renderer.cpp

diff --git a/src/Renderer/Renderer.cpp b/src/Renderer/Renderer.cpp
index ffdb547..dbde7e3 100644
--- a/src/Renderer/Renderer.cpp
+++ b/src/Renderer/Renderer.cpp
@@ -682,9 +682,9 @@
 		blitter->clear(value, format, dest, clearRect, rgbaMask);
 	}
 
-	void Renderer::blit(Surface *source, const SliceRectF &sRect, Surface *dest, const SliceRect &dRect, bool filter, bool isStencil)
+	void Renderer::blit(Surface *source, const SliceRectF &sRect, Surface *dest, const SliceRect &dRect, bool filter, bool isStencil, bool sRGBconversion)
 	{
-		blitter->blit(source, sRect, dest, dRect, {filter, isStencil});
+		blitter->blit(source, sRect, dest, dRect, {filter, isStencil, sRGBconversion});
 	}
 
 	void Renderer::blit3D(Surface *source, Surface *dest)