Add blend optimization helpers and use to convert rect draws to clears.
R=robertphillips@google.com, jvanverth@google.com
Author: bsalomon@google.com
Review URL: https://chromiumcodereview.appspot.com/22558003
git-svn-id: http://skia.googlecode.com/svn/trunk@10723 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrPaint.cpp b/src/gpu/GrPaint.cpp
index d67f2e8..898a32f 100644
--- a/src/gpu/GrPaint.cpp
+++ b/src/gpu/GrPaint.cpp
@@ -8,6 +8,7 @@
#include "GrPaint.h"
+#include "GrBlend.h"
#include "effects/GrSimpleTextureEffect.h"
void GrPaint::addColorTextureEffect(GrTexture* texture, const SkMatrix& matrix) {
@@ -33,3 +34,96 @@
GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix, params);
this->addCoverageEffect(effect)->unref();
}
+
+bool GrPaint::isOpaque() const {
+ return this->getOpaqueAndKnownColor(NULL, NULL);
+}
+
+bool GrPaint::isOpaqueAndConstantColor(GrColor* color) const {
+ GrColor tempColor;
+ uint32_t colorComps;
+ if (this->getOpaqueAndKnownColor(&tempColor, &colorComps)) {
+ if (kRGBA_GrColorComponentFlags == colorComps) {
+ *color = tempColor;
+ return true;
+ }
+ }
+ return false;
+}
+
+bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
+ uint32_t* solidColorKnownComponents) const {
+
+ // TODO: Share this implementation with GrDrawState
+
+ // Since fColorFilterXfermode is going away soon, we aren't attempting to handle anything but
+ // the default setting.
+ if (SkXfermode::kDst_Mode != fColorFilterXfermode) {
+ return false;
+ }
+
+ GrColor coverage = GrColorPackRGBA(fCoverage, fCoverage, fCoverage, fCoverage);
+ uint32_t coverageComps = kRGBA_GrColorComponentFlags;
+ int count = fCoverageStages.count();
+ for (int i = 0; i < count; ++i) {
+ (*fCoverageStages[i].getEffect())->getConstantColorComponents(&coverage, &coverageComps);
+ }
+ if (kRGBA_GrColorComponentFlags != coverageComps || 0xffffffff != coverage) {
+ return false;
+ }
+
+ GrColor color = fColor;
+ uint32_t colorComps = kRGBA_GrColorComponentFlags;
+ count = fColorStages.count();
+ for (int i = 0; i < count; ++i) {
+ (*fColorStages[i].getEffect())->getConstantColorComponents(&color, &colorComps);
+ }
+
+ GrAssert((NULL == solidColor) == (NULL == solidColorKnownComponents));
+
+ GrBlendCoeff srcCoeff = fSrcBlendCoeff;
+ GrBlendCoeff dstCoeff = fDstBlendCoeff;
+ GrSimplifyBlend(&srcCoeff, &dstCoeff, color, colorComps, 0, 0, 0);
+
+ bool opaque = kZero_GrBlendCoeff == dstCoeff && !GrBlendCoeffRefsDst(srcCoeff);
+ if (NULL != solidColor) {
+ if (opaque) {
+ switch (srcCoeff) {
+ case kZero_GrBlendCoeff:
+ *solidColor = 0;
+ *solidColorKnownComponents = kRGBA_GrColorComponentFlags;
+ break;
+
+ case kOne_GrBlendCoeff:
+ *solidColor = color;
+ *solidColorKnownComponents = colorComps;
+ break;
+
+ // The src coeff should never refer to the src and if it refers to dst then opaque
+ // should have been false.
+ case kSC_GrBlendCoeff:
+ case kISC_GrBlendCoeff:
+ case kDC_GrBlendCoeff:
+ case kIDC_GrBlendCoeff:
+ case kSA_GrBlendCoeff:
+ case kISA_GrBlendCoeff:
+ case kDA_GrBlendCoeff:
+ case kIDA_GrBlendCoeff:
+ default:
+ GrCrash("srcCoeff should not refer to src or dst.");
+ break;
+
+ // TODO: update this once GrPaint actually has a const color.
+ case kConstC_GrBlendCoeff:
+ case kIConstC_GrBlendCoeff:
+ case kConstA_GrBlendCoeff:
+ case kIConstA_GrBlendCoeff:
+ *solidColorKnownComponents = 0;
+ break;
+ }
+ } else {
+ solidColorKnownComponents = 0;
+ }
+ }
+ return opaque;
+}