Don't use NULL GrOptDrawState to indicate that draw should be skipped.

Review URL: https://codereview.chromium.org/742853002

3 files changed, 32 insertions, 47 deletions

diff --git a/src/gpu/GrInOrderDrawBuffer.cpp b/src/gpu/GrInOrderDrawBuffer.cpp
index cb44c2bb45..2f90373c33 100644
--- a/src/gpu/GrInOrderDrawBuffer.cpp
+++ b/src/gpu/GrInOrderDrawBuffer.cpp
@@ -727,9 +727,9 @@ bool GrInOrderDrawBuffer::recordStateAndShouldDraw(const GrDrawState& ds,
                                                    GrGpu::DrawType drawType,
                                                    const GrClipMaskManager::ScissorState& scissor,
                                                    const GrDeviceCoordTexture* dstCopy) {
-    SkAutoTUnref<GrOptDrawState> optState(GrOptDrawState::Create(ds, fDstGpu, scissor, dstCopy,
-                                                                 drawType));
-    if (!optState) {
+    SkAutoTUnref<GrOptDrawState> optState(
+        SkNEW_ARGS(GrOptDrawState, (ds, fDstGpu, scissor, dstCopy, drawType)));
+    if (optState->mustSkip()) {
         return false;
     }
     if (!fLastState || *optState != *fLastState) {
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index 4f2d24f03a..a494b171de 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -14,14 +14,35 @@
 #include "GrProcOptInfo.h"
 
 GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
-                               GrDrawState::BlendOpt blendOpt,
-                               GrBlendCoeff optSrcCoeff,
-                               GrBlendCoeff optDstCoeff,
                                GrGpu* gpu,
                                const ScissorState& scissorState,
                                const GrDeviceCoordTexture* dstCopy,
-                               GrGpu::DrawType drawType)
-: fRenderTarget(drawState.fRenderTarget.get()) {
+                               GrGpu::DrawType drawType) {
+
+    GrBlendCoeff optSrcCoeff;
+    GrBlendCoeff optDstCoeff;
+    GrDrawState::BlendOpt blendOpt = drawState.getBlendOpt(false, &optSrcCoeff, &optDstCoeff);
+
+    // When path rendering the stencil settings are not always set on the draw state
+    // so we must check the draw type. In cases where we will skip drawing we simply return a
+    // null GrOptDrawState.
+    if (GrDrawState::kSkipDraw_BlendOpt == blendOpt && GrGpu::kStencilPath_DrawType != drawType) {
+        // Set the fields that don't default init and return. The lack of a render target will
+        // indicate that this can be skipped.
+        fFlags = 0;
+        fVAPtr = NULL;
+        fVACount = 0;
+        fVAStride = 0;
+        fDrawFace = GrDrawState::kInvalid_DrawFace;
+        fSrcBlend = kZero_GrBlendCoeff;
+        fDstBlend = kZero_GrBlendCoeff;
+        fBlendConstant = 0x0;
+        fViewMatrix.reset();
+        return;
+    }
+
+    fRenderTarget.reset(drawState.fRenderTarget.get());
+    SkASSERT(fRenderTarget);
     fScissorState = scissorState;
     fViewMatrix = drawState.getViewMatrix();
     fBlendConstant = drawState.getBlendConstant();
@@ -106,28 +127,6 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
     gpu->buildProgramDesc(*this, descInfo, drawType, &fDesc);
 };
 
-GrOptDrawState* GrOptDrawState::Create(const GrDrawState& drawState,
-                                       GrGpu* gpu,
-                                       const ScissorState& scissorState,
-                                       const GrDeviceCoordTexture* dstCopy,
-                                       GrGpu::DrawType drawType) {
-    GrBlendCoeff srcCoeff;
-    GrBlendCoeff dstCoeff;
-    GrDrawState::BlendOpt blendOpt = drawState.getBlendOpt(false, &srcCoeff, &dstCoeff);
-
-    // If our blend coeffs are set to 0,1 we know we will not end up drawing unless we are
-    // stenciling. When path rendering the stencil settings are not always set on the draw state
-    // so we must check the draw type. In cases where we will skip drawing we simply return a
-    // null GrOptDrawState.
-    if (kZero_GrBlendCoeff == srcCoeff && kOne_GrBlendCoeff == dstCoeff &&
-        !drawState.getStencil().doesWrite() && GrGpu::kStencilPath_DrawType != drawType) {
-        return NULL;
-    }
-
-    return SkNEW_ARGS(GrOptDrawState, (drawState, blendOpt, srcCoeff,
-                                       dstCoeff, gpu, scissorState, dstCopy, drawType));
-}
-
 void GrOptDrawState::setOutputStateInfo(const GrDrawState& ds,
                                         GrDrawState::BlendOpt blendOpt,
                                         const GrDrawTargetCaps& caps,
diff --git a/src/gpu/GrOptDrawState.h b/src/gpu/GrOptDrawState.h
index b727cb5442..91c39a181c 100644
--- a/src/gpu/GrOptDrawState.h
+++ b/src/gpu/GrOptDrawState.h
@@ -30,15 +30,8 @@ public:
 
     typedef GrClipMaskManager::ScissorState ScissorState;
 
-    /**
-     * Returns a snapshot of the current optimized state. The GrOptDrawState is reffed and ownership
-     * is given to the caller.
-     */
-    static GrOptDrawState* Create(const GrDrawState& drawState,
-                                  GrGpu*,
-                                  const ScissorState&,
-                                  const GrDeviceCoordTexture* dstCopy,
-                                  GrGpu::DrawType drawType);
+    GrOptDrawState(const GrDrawState& drawState, GrGpu*, const ScissorState&,
+                   const GrDeviceCoordTexture* dstCopy, GrGpu::DrawType);
 
     bool operator== (const GrOptDrawState& that) const;
     bool operator!= (const GrOptDrawState& that) const { return !(*this == that); }
@@ -182,6 +175,7 @@ public:
     bool isDitherState() const { return SkToBool(fFlags & kDither_Flag); }
     bool isHWAntialiasState() const { return SkToBool(fFlags & kHWAA_Flag); }
     bool isColorWriteDisabled() const { return SkToBool(fFlags & kDisableColorWrite_Flag); }
+    bool mustSkip() const { return NULL == this->getRenderTarget(); }
 
     /// @}
 
@@ -202,14 +196,6 @@ public:
 
 private:
     /**
-     * Constructs and optimized drawState out of a GrRODrawState.
-     */
-    GrOptDrawState(const GrDrawState& drawState, GrDrawState::BlendOpt,
-                   GrBlendCoeff optSrcCoeff, GrBlendCoeff optDstCoeff,
-                   GrGpu*, const ScissorState&, const GrDeviceCoordTexture* dstCopy,
-                   GrGpu::DrawType);
-
-    /**
      * Loops through all the color stage effects to check if the stage will ignore color input or
      * always output a constant color. In the ignore color input case we can ignore all previous
      * stages. In the constant color case, we can ignore all previous stages and