Split GrDrawState and GrOptDrawState into separate classes and remove base class.

src/gpu/GrRODrawState.cpp

Index: src/gpu/GrRODrawState.cpp
diff --git a/src/gpu/GrRODrawState.cpp b/src/gpu/GrRODrawState.cpp
deleted file mode 100644
index 2a673f3e5ecbe2a7a29f1968a9afbdd7ae8fba92..0000000000000000000000000000000000000000
--- a/src/gpu/GrRODrawState.cpp
+++ /dev/null
@@ -1,350 +0,0 @@
-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrRODrawState.h"
-
-#include "GrDrawTargetCaps.h"
-#include "GrRenderTarget.h"
-
-////////////////////////////////////////////////////////////////////////////////
-
-GrRODrawState::GrRODrawState(const GrRODrawState& drawState) : INHERITED() {
-    fRenderTarget.setResource(SkSafeRef(drawState.fRenderTarget.getResource()),
-                              GrIORef::kWrite_IOType);
-}
-
-bool GrRODrawState::isEqual(const GrRODrawState& that) const {
-    bool usingVertexColors = this->hasColorVertexAttribute();
-    if (!usingVertexColors && this->fColor != that.fColor) {
-        return false;
-    }
-
-    if (this->getRenderTarget() != that.getRenderTarget() ||
-        this->fColorStages.count() != that.fColorStages.count() ||
-        this->fCoverageStages.count() != that.fCoverageStages.count() ||
-        !this->fViewMatrix.cheapEqualTo(that.fViewMatrix) ||
-        this->fSrcBlend != that.fSrcBlend ||
-        this->fDstBlend != that.fDstBlend ||
-        this->fBlendConstant != that.fBlendConstant ||
-        this->fFlagBits != that.fFlagBits ||
-        this->fVACount != that.fVACount ||
-        this->fVAStride != that.fVAStride ||
-        memcmp(this->fVAPtr, that.fVAPtr, this->fVACount * sizeof(GrVertexAttrib)) ||
-        this->fStencilSettings != that.fStencilSettings ||
-        this->fDrawFace != that.fDrawFace) {
-        return false;
-    }
-
-    bool usingVertexCoverage = this->hasCoverageVertexAttribute();
-    if (!usingVertexCoverage && this->fCoverage != that.fCoverage) {
-        return false;
-    }
-
-    bool explicitLocalCoords = this->hasLocalCoordAttribute();
-    if (this->hasGeometryProcessor()) {
-        if (!that.hasGeometryProcessor()) {
-            return false;
-        } else if (!GrProcessorStage::AreCompatible(*this->getGeometryProcessor(),
-                                                    *that.getGeometryProcessor(),
-                                                    explicitLocalCoords)) {
-            return false;
-        }
-    } else if (that.hasGeometryProcessor()) {
-        return false;
-    }
-
-    for (int i = 0; i < this->numColorStages(); i++) {
-        if (!GrProcessorStage::AreCompatible(this->getColorStage(i), that.getColorStage(i),
-                                             explicitLocalCoords)) {
-            return false;
-        }
-    }
-    for (int i = 0; i < this->numCoverageStages(); i++) {
-        if (!GrProcessorStage::AreCompatible(this->getCoverageStage(i), that.getCoverageStage(i),
-                                             explicitLocalCoords)) {
-            return false;
-        }
-    }
-
-    SkASSERT(0 == memcmp(this->fFixedFunctionVertexAttribIndices,
-                            that.fFixedFunctionVertexAttribIndices,
-                            sizeof(this->fFixedFunctionVertexAttribIndices)));
-
-    return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-bool GrRODrawState::validateVertexAttribs() const {
-    // check consistency of effects and attributes
-    GrSLType slTypes[kMaxVertexAttribCnt];
-    for (int i = 0; i < kMaxVertexAttribCnt; ++i) {
-        slTypes[i] = static_cast<GrSLType>(-1);
-    }
-
-    if (this->hasGeometryProcessor()) {
-        const GrGeometryStage& stage = *this->getGeometryProcessor();
-        const GrGeometryProcessor* gp = stage.getGeometryProcessor();
-        SkASSERT(gp);
-        // make sure that any attribute indices have the correct binding type, that the attrib
-        // type and effect's shader lang type are compatible, and that attributes shared by
-        // multiple effects use the same shader lang type.
-        const GrGeometryProcessor::VertexAttribArray& s = gp->getVertexAttribs();
-
-        int effectIndex = 0;
-        for (int index = 0; index < fVACount; index++) {
-            if (kGeometryProcessor_GrVertexAttribBinding != fVAPtr[index].fBinding) {
-                // we only care about effect bindings
-                continue;
-            }
-            SkASSERT(effectIndex < s.count());
-            GrSLType effectSLType = s[effectIndex].getType();
-            GrVertexAttribType attribType = fVAPtr[index].fType;
-            int slVecCount = GrSLTypeVectorCount(effectSLType);
-            int attribVecCount = GrVertexAttribTypeVectorCount(attribType);
-            if (slVecCount != attribVecCount ||
-                (static_cast<GrSLType>(-1) != slTypes[index] && slTypes[index] != effectSLType)) {
-                return false;
-            }
-            slTypes[index] = effectSLType;
-            effectIndex++;
-        }
-        // Make sure all attributes are consumed and we were able to find everything
-        SkASSERT(s.count() == effectIndex);
-    }
-
-    return true;
-}
-
-bool GrRODrawState::hasSolidCoverage() const {
-    // If we're drawing coverage directly then coverage is effectively treated as color.
-    if (this->isCoverageDrawing()) {
-        return true;
-    }
-
-    GrColor coverage;
-    uint32_t validComponentFlags;
-    // Initialize to an unknown starting coverage if per-vertex coverage is specified.
-    if (this->hasCoverageVertexAttribute()) {
-        validComponentFlags = 0;
-    } else {
-        coverage = fCoverage;
-        validComponentFlags = kRGBA_GrColorComponentFlags;
-    }
-
-    // Run through the coverage stages and see if the coverage will be all ones at the end.
-    if (this->hasGeometryProcessor()) {
-        const GrGeometryProcessor* gp = fGeometryProcessor->getGeometryProcessor();
-        gp->getConstantColorComponents(&coverage, &validComponentFlags);
-    }
-    for (int s = 0; s < this->numCoverageStages(); ++s) {
-        const GrProcessor* processor = this->getCoverageStage(s).getProcessor();
-        processor->getConstantColorComponents(&coverage, &validComponentFlags);
-    }
-    return (kRGBA_GrColorComponentFlags == validComponentFlags) && (0xffffffff == coverage);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-bool GrRODrawState::willEffectReadDstColor() const {
-    if (!this->isColorWriteDisabled()) {
-        for (int s = 0; s < this->numColorStages(); ++s) {
-            if (this->getColorStage(s).getFragmentProcessor()->willReadDstColor()) {
-                return true;
-            }
-        }
-    }
-    for (int s = 0; s < this->numCoverageStages(); ++s) {
-        if (this->getCoverageStage(s).getFragmentProcessor()->willReadDstColor()) {
-            return true;
-        }
-    }
-    return false;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-GrRODrawState::BlendOptFlags GrRODrawState::getBlendOpts(bool forceCoverage,
-                                                         GrBlendCoeff* srcCoeff,
-                                                         GrBlendCoeff* dstCoeff) const {
-    GrBlendCoeff bogusSrcCoeff, bogusDstCoeff;
-    if (NULL == srcCoeff) {
-        srcCoeff = &bogusSrcCoeff;
-    }
-    if (NULL == dstCoeff) {
-        dstCoeff = &bogusDstCoeff;
-    }
-
-    *srcCoeff = this->getSrcBlendCoeff();
-    *dstCoeff = this->getDstBlendCoeff();
-
-    if (this->isColorWriteDisabled()) {
-        *srcCoeff = kZero_GrBlendCoeff;
-        *dstCoeff = kOne_GrBlendCoeff;
-    }
-
-    bool srcAIsOne = this->srcAlphaWillBeOne();
-    bool dstCoeffIsOne = kOne_GrBlendCoeff == *dstCoeff ||
-                         (kSA_GrBlendCoeff == *dstCoeff && srcAIsOne);
-    bool dstCoeffIsZero = kZero_GrBlendCoeff == *dstCoeff ||
-                         (kISA_GrBlendCoeff == *dstCoeff && srcAIsOne);
-
-    // When coeffs are (0,1) there is no reason to draw at all, unless
-    // stenciling is enabled. Having color writes disabled is effectively
-    // (0,1).
-    if ((kZero_GrBlendCoeff == *srcCoeff && dstCoeffIsOne)) {
-        if (this->getStencil().doesWrite()) {
-            return kEmitCoverage_BlendOptFlag;
-        } else {
-            *dstCoeff = kOne_GrBlendCoeff;
-            return kSkipDraw_BlendOptFlag;
-        }
-    }
-
-    bool hasCoverage = forceCoverage || !this->hasSolidCoverage();
-
-    // if we don't have coverage we can check whether the dst
-    // has to read at all. If not, we'll disable blending.
-    if (!hasCoverage) {
-        if (dstCoeffIsZero) {
-            if (kOne_GrBlendCoeff == *srcCoeff) {
-                // if there is no coverage and coeffs are (1,0) then we
-                // won't need to read the dst at all, it gets replaced by src
-                *dstCoeff = kZero_GrBlendCoeff;
-                return kNone_BlendOpt;
-            } else if (kZero_GrBlendCoeff == *srcCoeff) {
-                // if the op is "clear" then we don't need to emit a color
-                // or blend, just write transparent black into the dst.
-                *srcCoeff = kOne_GrBlendCoeff;
-                *dstCoeff = kZero_GrBlendCoeff;
-                return kEmitTransBlack_BlendOptFlag;
-            }
-        }
-    } else if (this->isCoverageDrawing()) {
-        // we have coverage but we aren't distinguishing it from alpha by request.
-        return kCoverageAsAlpha_BlendOptFlag;
-    } else {
-        // check whether coverage can be safely rolled into alpha
-        // of if we can skip color computation and just emit coverage
-        if (this->canTweakAlphaForCoverage()) {
-            return kCoverageAsAlpha_BlendOptFlag;
-        }
-        if (dstCoeffIsZero) {
-            if (kZero_GrBlendCoeff == *srcCoeff) {
-                // the source color is not included in the blend
-                // the dst coeff is effectively zero so blend works out to:
-                // (c)(0)D + (1-c)D = (1-c)D.
-                *dstCoeff = kISA_GrBlendCoeff;
-                return  kEmitCoverage_BlendOptFlag;
-            } else if (srcAIsOne) {
-                // the dst coeff is effectively zero so blend works out to:
-                // cS + (c)(0)D + (1-c)D = cS + (1-c)D.
-                // If Sa is 1 then we can replace Sa with c
-                // and set dst coeff to 1-Sa.
-                *dstCoeff = kISA_GrBlendCoeff;
-                return  kCoverageAsAlpha_BlendOptFlag;
-            }
-        } else if (dstCoeffIsOne) {
-            // the dst coeff is effectively one so blend works out to:
-            // cS + (c)(1)D + (1-c)D = cS + D.
-            *dstCoeff = kOne_GrBlendCoeff;
-            return  kCoverageAsAlpha_BlendOptFlag;
-        }
-    }
-
-    return kNone_BlendOpt;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// Some blend modes allow folding a fractional coverage value into the color's alpha channel, while
-// others will blend incorrectly.
-bool GrRODrawState::canTweakAlphaForCoverage() const {
-    /*
-     The fractional coverage is f.
-     The src and dst coeffs are Cs and Cd.
-     The dst and src colors are S and D.
-     We want the blend to compute: f*Cs*S + (f*Cd + (1-f))D. By tweaking the source color's alpha
-     we're replacing S with S'=fS. It's obvious that that first term will always be ok. The second
-     term can be rearranged as [1-(1-Cd)f]D. By substituting in the various possibilities for Cd we
-     find that only 1, ISA, and ISC produce the correct destination when applied to S' and D.
-     Also, if we're directly rendering coverage (isCoverageDrawing) then coverage is treated as
-     color by definition.
-     */
-    return kOne_GrBlendCoeff == fDstBlend ||
-           kISA_GrBlendCoeff == fDstBlend ||
-           kISC_GrBlendCoeff == fDstBlend ||
-           this->isCoverageDrawing();
-}
-
-void GrRODrawState::convertToPendingExec() {
-    fRenderTarget.markPendingIO();
-    fRenderTarget.removeRef();
-    for (int i = 0; i < fColorStages.count(); ++i) {
-        fColorStages[i].convertToPendingExec();
-    }
-    if (fGeometryProcessor) {
-        fGeometryProcessor->convertToPendingExec();
-    }
-    for (int i = 0; i < fCoverageStages.count(); ++i) {
-        fCoverageStages[i].convertToPendingExec();
-    }
-}
-
-bool GrRODrawState::srcAlphaWillBeOne() const {
-    uint32_t validComponentFlags;
-    GrColor color;
-    // Check if per-vertex or constant color may have partial alpha
-    if (this->hasColorVertexAttribute()) {
-        if (fHints & kVertexColorsAreOpaque_Hint) {
-            validComponentFlags = kA_GrColorComponentFlag;
-            color = 0xFF << GrColor_SHIFT_A;
-        } else {
-            validComponentFlags = 0;
-            color = 0; // not strictly necessary but we get false alarms from tools about uninit.
-        }
-    } else {
-        validComponentFlags = kRGBA_GrColorComponentFlags;
-        color = this->getColor();
-    }
-
-    // Run through the color stages
-    for (int s = 0; s < this->numColorStages(); ++s) {
-        const GrProcessor* processor = this->getColorStage(s).getProcessor();
-        processor->getConstantColorComponents(&color, &validComponentFlags);
-    }
-
-    // Check whether coverage is treated as color. If so we run through the coverage computation.
-    if (this->isCoverageDrawing()) {
-        // The shader generated for coverage drawing runs the full coverage computation and then
-        // makes the shader output be the multiplication of color and coverage. We mirror that here.
-        GrColor coverage;
-        uint32_t coverageComponentFlags;
-        if (this->hasCoverageVertexAttribute()) {
-            coverageComponentFlags = 0;
-            coverage = 0; // suppresses any warnings.
-        } else {
-            coverageComponentFlags = kRGBA_GrColorComponentFlags;
-            coverage = this->getCoverageColor();
-        }
-
-        // Run through the coverage stages
-        for (int s = 0; s < this->numCoverageStages(); ++s) {
-            const GrProcessor* processor = this->getCoverageStage(s).getProcessor();
-            processor->getConstantColorComponents(&coverage, &coverageComponentFlags);
-        }
-
-        // Since the shader will multiply coverage and color, the only way the final A==1 is if
-        // coverage and color both have A==1.
-        return (kA_GrColorComponentFlag & validComponentFlags & coverageComponentFlags) &&
-                0xFF == GrColorUnpackA(color) && 0xFF == GrColorUnpackA(coverage);
-
-    }
-
-    return (kA_GrColorComponentFlag & validComponentFlags) && 0xFF == GrColorUnpackA(color);
-}
-