Add support for blending of LCD for all blend modes.

tests/GrPorterDuffTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermode.h"
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
 
 #include "GrContextFactory.h"
 #include "GrContextOptions.h"
 #include "GrGpu.h"
 #include "GrResourceProvider.h"
 #include "GrXferProcessor.h"
 #include "batches/GrVertexBatch.h"
 #include "effects/GrPorterDuffXferProcessor.h"
 #include "gl/GrGLCaps.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 
 static void test_color_unknown_with_coverage(skiatest::Reporter* reporter, const GrCaps& caps);
 static void test_color_unknown_no_coverage(skiatest::Reporter* reporter, const GrCaps& caps);
 static void test_color_opaque_with_coverage(skiatest::Reporter* reporter, const GrCaps& caps);
 static void test_color_opaque_no_coverage(skiatest::Reporter* reporter, const GrCaps& caps);
 static void test_lcd_coverage(skiatest::Reporter* reporter, const GrCaps& caps);
+static void test_lcd_coverage_fallback_case(skiatest::Reporter* reporter, const GrCaps& caps);
 static void test_no_dual_source_blending(skiatest::Reporter* reporter);
 
 DEF_GPUTEST(GrPorterDuff, reporter, factory) {
     GrContext* ctx = factory->get(GrContextFactory::kNull_GLContextType);
     if (!ctx) {
         SkFAIL("Failed to create null context.");
         return;
     }
 
     const GrCaps& caps = *ctx->getGpu()->caps();
     if (!caps.shaderCaps()->dualSourceBlendingSupport()) {
         SkFAIL("Null context does not support dual source blending.");
         return;
     }
 
     test_color_unknown_with_coverage(reporter, caps);
     test_color_unknown_no_coverage(reporter, caps);
     test_color_opaque_with_coverage(reporter, caps);
     test_color_opaque_no_coverage(reporter, caps);
     test_lcd_coverage(reporter, caps);
+    test_lcd_coverage_fallback_case(reporter, caps);
     test_no_dual_source_blending(reporter);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 #define TEST_ASSERT(...) REPORTER_ASSERT(reporter, __VA_ARGS__)
 
 enum {
     kNone_OutputType,
     kCoverage_OutputType,
     kModulate_OutputType,
+    kSAModulate_OutputType,
     kISAModulate_OutputType,
     kISCModulate_OutputType
 };
 
 enum {
     kNone_OptFlags                    = GrXferProcessor::kNone_OptFlags,
     kSkipDraw_OptFlag                 = GrXferProcessor::kSkipDraw_OptFlag,
     kIgnoreColor_OptFlag              = GrXferProcessor::kIgnoreColor_OptFlag,
     kIgnoreCoverage_OptFlag           = GrXferProcessor::kIgnoreCoverage_OptFlag,
     kCanTweakAlphaForCoverage_OptFlag = GrXferProcessor::kCanTweakAlphaForCoverage_OptFlag
@@ skipping 21 matching lines @@
         int fPrimaryOutputType;
         int fSecondaryOutputType;
         GrXferProcessor::BlendInfo fBlendInfo;
     };
 
     static void GetXPOutputTypes(const GrXferProcessor* xp, int* outPrimary, int* outSecondary) {
         GrPorterDuffXPFactory::TestGetXPOutputTypes(xp, outPrimary, outSecondary);
     }
 };
 
+static void test_lcd_coverage(skiatest::Reporter* reporter, const GrCaps& caps) {
+    GrProcOptInfo colorPOI, covPOI;
+    colorPOI.calcWithInitialValues(NULL, 0, 0, kNone_GrColorComponentFlags, false);
+    // Setting 2nd to last value to false and last to true will force covPOI to LCD coverage.
+    covPOI.calcWithInitialValues(NULL, 0, 0, kNone_GrColorComponentFlags, false, true);
+
+    SkASSERT(!colorPOI.isOpaque());
+    SkASSERT(!colorPOI.isSolidWhite());
+    SkASSERT(!covPOI.isSolidWhite());
+    SkASSERT(covPOI.isFourChannelOutput());
+
+    for (int m = 0; m <= SkXfermode::kLastCoeffMode; m++) {
+        SkXfermode::Mode xfermode = static_cast<SkXfermode::Mode>(m);
+        const GrPorterDuffTest::XPInfo xpi(reporter, xfermode, caps, colorPOI, covPOI);
+
+        switch (xfermode) {
+            case SkXfermode::kClear_Mode:
+                TEST_ASSERT(!xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(0 == xpi.fBlendedColor.fKnownColor);
+                TEST_ASSERT(kRGBA_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kIgnoreColor_OptFlag) == xpi.fOptFlags);
+                TEST_ASSERT(kCoverage_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kReverseSubtract_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kDC_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kSrc_Mode:
+                TEST_ASSERT(!xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kCoverage_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kDst_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kSkipDraw_OptFlag |
+                             kIgnoreColor_OptFlag |
+                             kIgnoreCoverage_OptFlag |
+                             kCanTweakAlphaForCoverage_OptFlag) == xpi.fOptFlags);
+                TEST_ASSERT(kNone_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kZero_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(!xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kSrcOver_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kSAModulate_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kDstOver_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kIDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kSrcIn_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kCoverage_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kDstIn_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kISAModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kReverseSubtract_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kDC_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kSrcOut_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kCoverage_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kIDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kDstOut_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kSAModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kZero_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kISC_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kSrcATop_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kSAModulate_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kDstATop_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kISAModulate_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kIDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kXor_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kSAModulate_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kIDA_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kIS2C_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kPlus_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kModulate_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kISCModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kReverseSubtract_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kDC_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            case SkXfermode::kScreen_Mode:
+                TEST_ASSERT(xpi.fBlendedColor.fWillBlendWithDst);
+                TEST_ASSERT(kNone_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
+                TEST_ASSERT((kNone_OptFlags) == xpi.fOptFlags);
+                TEST_ASSERT(kModulate_OutputType == xpi.fPrimaryOutputType);
+                TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
+                TEST_ASSERT(kAdd_GrBlendEquation == xpi.fBlendInfo.fEquation);
+                TEST_ASSERT(kOne_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
+                TEST_ASSERT(kISC_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
+                TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
+                break;
+            default:
+                ERRORF(reporter, "Invalid xfermode.");
+                break;
+        }
+    }
+}
 static void test_color_unknown_with_coverage(skiatest::Reporter* reporter, const GrCaps& caps) {
     GrProcOptInfo colorPOI, covPOI;
     colorPOI.calcWithInitialValues(nullptr, 0, 0, kNone_GrColorComponentFlags, false);
     covPOI.calcWithInitialValues(nullptr, 0, 0, kNone_GrColorComponentFlags, true);
 
     SkASSERT(!colorPOI.isOpaque());
     SkASSERT(!colorPOI.isSolidWhite());
     SkASSERT(!covPOI.isSolidWhite());
     SkASSERT(!covPOI.isFourChannelOutput());
 
     for (int m = 0; m <= SkXfermode::kLastCoeffMode; m++) {
         SkXfermode::Mode xfermode = static_cast<SkXfermode::Mode>(m);
         const GrPorterDuffTest::XPInfo xpi(reporter, xfermode, caps, colorPOI, covPOI);
 
+
         switch (xfermode) {
             case SkXfermode::kClear_Mode:
                 TEST_ASSERT(!xpi.fBlendedColor.fWillBlendWithDst);
                 TEST_ASSERT(0 == xpi.fBlendedColor.fKnownColor);
                 TEST_ASSERT(kRGBA_GrColorComponentFlags == xpi.fBlendedColor.fKnownColorFlags);
                 TEST_ASSERT((kIgnoreColor_OptFlag) == xpi.fOptFlags);
                 TEST_ASSERT(kCoverage_OutputType == xpi.fPrimaryOutputType);
                 TEST_ASSERT(kNone_OutputType == xpi.fSecondaryOutputType);
                 TEST_ASSERT(kReverseSubtract_GrBlendEquation == xpi.fBlendInfo.fEquation);
                 TEST_ASSERT(kDC_GrBlendCoeff == xpi.fBlendInfo.fSrcBlend);
@@ skipping 765 matching lines @@
                 TEST_ASSERT(kISC_GrBlendCoeff == xpi.fBlendInfo.fDstBlend);
                 TEST_ASSERT(xpi.fBlendInfo.fWriteColor);
                 break;
             default:
                 ERRORF(reporter, "Invalid xfermode.");
                 break;
         }
     }
 }
 
-static void test_lcd_coverage(skiatest::Reporter* reporter, const GrCaps& caps) {
+static void test_lcd_coverage_fallback_case(skiatest::Reporter* reporter, const GrCaps& caps) {
     class : public GrVertexBatch {
         void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
             out->setKnownFourComponents(GrColorPackRGBA(123, 45, 67, 221));
         }
 
         void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
             out->setUnknownFourComponents();
             out->setUsingLCDCoverage();
         }
 
@@ skipping 97 matching lines @@
                 TEST_ASSERT(!xp->hasSecondaryOutput());
                 xp->getOptimizations(colorPOI, covPOI, false, 0, caps);
                 TEST_ASSERT(!xp->hasSecondaryOutput());
             }
         }
     }
 }
 
 #endif