Add a SSE2 version of comp_func_SourceOver()

Implement a version of comp_func_SourceOver() with SSE2. This gives a
performance boost of 11% on some WebKit animations.

Two new macros were added to simplify the implementation of the
different blending primitives:
BLEND_SOURCE_OVER_ARGB32_SSE2() and
BLEND_SOURCE_OVER_ARGB32_WITH_CONST_ALPHA_SSE2()

Reviewed-by: Samuel Rødal

1 files changed, 6 insertions, 1 deletions

diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index bfa1136..d088499 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -7817,6 +7817,12 @@ void qInitDrawhelperAsm()
 
 #ifdef QT_HAVE_SSE2
         if (features & SSE2) {
+            extern void comp_func_SourceOver_sse2(uint *destPixels,
+                                                  const uint *srcPixels,
+                                                  int length,
+                                                  uint const_alpha);
+            functionForModeAsm[0] = comp_func_SourceOver_sse2;
+
             extern void qt_blend_rgb32_on_rgb32_sse2(uchar *destPixels, int dbpl,
                                                      const uchar *srcPixels, int sbpl,
                                                      int w, int h,
@@ -7826,7 +7832,6 @@ void qInitDrawhelperAsm()
                                                        int w, int h,
                                                        int const_alpha);
 
-
             qBlendFunctions[QImage::Format_RGB32][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse2;
             qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse2;
             qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse2;