Implement path cover with nv_path_rendering

src/gpu/GrDrawTarget.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #include "GrDrawTarget.h"
 #include "GrContext.h"
 #include "GrDrawTargetCaps.h"
+#include "GrPath.h"
 #include "GrRenderTarget.h"
 #include "GrTexture.h"
 #include "GrVertexBuffer.h"
 
 #include "SkStrokeRec.h"
 
 SK_DEFINE_INST_COUNT(GrDrawTarget)
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ skipping 382 matching lines @@
     }
 
     SkASSERT(drawState.validateVertexAttribs());
 #endif
     if (NULL == drawState.getRenderTarget()) {
         return false;
     }
     return true;
 }
 
-bool GrDrawTarget::setupDstReadIfNecessary(DrawInfo* info) {
+bool GrDrawTarget::setupDstReadIfNecessary(GrDeviceCoordTexture* dstCopy, const SkRect* drawBounds) {
     if (this->caps()->dstReadInShaderSupport() || !this->getDrawState().willEffectReadDstColor()) {
         return true;
     }
     GrRenderTarget* rt = this->drawState()->getRenderTarget();
+    SkIRect copyRect;
+    const GrClipData* clip = this->getClip();
+    clip->getConservativeBounds(rt, &copyRect);
 
-    const GrClipData* clip = this->getClip();
-    SkIRect copyRect;
-    clip->getConservativeBounds(this->getDrawState().getRenderTarget(), &copyRect);
-    SkIRect drawIBounds;
-    if (info->getDevIBounds(&drawIBounds)) {
+    if (NULL != drawBounds) {
+        SkIRect drawIBounds;
+        drawBounds->roundOut(&drawIBounds);
         if (!copyRect.intersect(drawIBounds)) {
 #ifdef SK_DEBUG
             GrPrintf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
 #endif
             return false;
         }
     } else {
 #ifdef SK_DEBUG
         //GrPrintf("No dev bounds when dst copy is made.\n");
 #endif
     }
 
     // MSAA consideration: When there is support for reading MSAA samples in the shader we could
     // have per-sample dst values by making the copy multisampled.
     GrTextureDesc desc;
     this->initCopySurfaceDstDesc(rt, &desc);
     desc.fWidth = copyRect.width();
     desc.fHeight = copyRect.height();
 
     GrAutoScratchTexture ast(fContext, desc, GrContext::kApprox_ScratchTexMatch);
 
     if (NULL == ast.texture()) {
         GrPrintf("Failed to create temporary copy of destination texture.\n");
         return false;
     }
     SkIPoint dstPoint = {0, 0};
     if (this->copySurface(ast.texture(), rt, copyRect, dstPoint)) {
-        info->fDstCopy.setTexture(ast.texture());
-        info->fDstCopy.setOffset(copyRect.fLeft, copyRect.fTop);
+        dstCopy->setTexture(ast.texture());
+        dstCopy->setOffset(copyRect.fLeft, copyRect.fTop);
         return true;
     } else {
         return false;
     }
 }
 
 void GrDrawTarget::drawIndexed(GrPrimitiveType type,
                                int startVertex,
                                int startIndex,
                                int vertexCount,
@@ skipping 45 matching lines @@
         if (!this->setupDstReadIfNecessary(&info)) {
             return;
         }
         this->onDraw(info);
     }
 }
 
 void GrDrawTarget::stencilPath(const GrPath* path, const SkStrokeRec& stroke, SkPath::FillType fill) {
     // TODO: extract portions of checkDraw that are relevant to path stenciling.
     SkASSERT(NULL != path);
-    SkASSERT(this->caps()->pathStencilingSupport());
+    SkASSERT(this->caps()->pathRenderingSupport());
     SkASSERT(!stroke.isHairlineStyle());
     SkASSERT(!SkPath::IsInverseFillType(fill));
     this->onStencilPath(path, stroke, fill);
 }
 
+void GrDrawTarget::fillPath(const GrPath* path, const SkStrokeRec& stroke, SkPath::FillType fill) {
+    // TODO: extract portions of checkDraw that are relevant to path rendering.
+    SkASSERT(NULL != path);
+    SkASSERT(this->caps()->pathRenderingSupport());
+    SkASSERT(!stroke.isHairlineStyle());
+    const GrDrawState* drawState = &getDrawState();
+
+    SkRect devBounds;
+    if (SkPath::IsInverseFillType(fill)) {
+        devBounds = SkRect::MakeWH(SkIntToScalar(drawState->getRenderTarget()->width()),
+                                   SkIntToScalar(drawState->getRenderTarget()->height()));
+    } else {
+        devBounds = path->getBounds();
+    }
+    SkMatrix viewM = drawState->getViewMatrix();
+    viewM.mapRect(&devBounds);
+
+    GrDeviceCoordTexture dstCopy;
+    if (!this->setupDstReadIfNecessary(&dstCopy, &devBounds)) {
+        return;
+    }
+
+    this->onFillPath(path, stroke, fill, dstCopy.texture() ? &dstCopy : NULL);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrDrawTarget::willUseHWAALines() const {
     // There is a conflict between using smooth lines and our use of premultiplied alpha. Smooth
     // lines tweak the incoming alpha value but not in a premul-alpha way. So we only use them when
     // our alpha is 0xff and tweaking the color for partial coverage is OK
     if (!this->caps()->hwAALineSupport() ||
         !this->getDrawState().isHWAntialiasState()) {
         return false;
     }
@@ skipping 405 matching lines @@
 void GrDrawTargetCaps::reset() {
     f8BitPaletteSupport = false;
     fNPOTTextureTileSupport = false;
     fTwoSidedStencilSupport = false;
     fStencilWrapOpsSupport = false;
     fHWAALineSupport = false;
     fShaderDerivativeSupport = false;
     fGeometryShaderSupport = false;
     fDualSourceBlendingSupport = false;
     fBufferLockSupport = false;
-    fPathStencilingSupport = false;
+    fPathRenderingSupport = false;
     fDstReadInShaderSupport = false;
     fReuseScratchTextures = true;
 
     fMaxRenderTargetSize = 0;
     fMaxTextureSize = 0;
     fMaxSampleCount = 0;
 }
 
 GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
     f8BitPaletteSupport = other.f8BitPaletteSupport;
     fNPOTTextureTileSupport = other.fNPOTTextureTileSupport;
     fTwoSidedStencilSupport = other.fTwoSidedStencilSupport;
     fStencilWrapOpsSupport = other.fStencilWrapOpsSupport;
     fHWAALineSupport = other.fHWAALineSupport;
     fShaderDerivativeSupport = other.fShaderDerivativeSupport;
     fGeometryShaderSupport = other.fGeometryShaderSupport;
     fDualSourceBlendingSupport = other.fDualSourceBlendingSupport;
     fBufferLockSupport = other.fBufferLockSupport;
-    fPathStencilingSupport = other.fPathStencilingSupport;
+    fPathRenderingSupport = other.fPathRenderingSupport;
     fDstReadInShaderSupport = other.fDstReadInShaderSupport;
     fReuseScratchTextures = other.fReuseScratchTextures;
 
     fMaxRenderTargetSize = other.fMaxRenderTargetSize;
     fMaxTextureSize = other.fMaxTextureSize;
     fMaxSampleCount = other.fMaxSampleCount;
 
     return *this;
 }
 
 void GrDrawTargetCaps::print() const {
     static const char* gNY[] = {"NO", "YES"};
     GrPrintf("8 Bit Palette Support       : %s\n", gNY[f8BitPaletteSupport]);
     GrPrintf("NPOT Texture Tile Support   : %s\n", gNY[fNPOTTextureTileSupport]);
     GrPrintf("Two Sided Stencil Support   : %s\n", gNY[fTwoSidedStencilSupport]);
     GrPrintf("Stencil Wrap Ops  Support   : %s\n", gNY[fStencilWrapOpsSupport]);
     GrPrintf("HW AA Lines Support         : %s\n", gNY[fHWAALineSupport]);
     GrPrintf("Shader Derivative Support   : %s\n", gNY[fShaderDerivativeSupport]);
     GrPrintf("Geometry Shader Support     : %s\n", gNY[fGeometryShaderSupport]);
     GrPrintf("Dual Source Blending Support: %s\n", gNY[fDualSourceBlendingSupport]);
     GrPrintf("Buffer Lock Support         : %s\n", gNY[fBufferLockSupport]);
-    GrPrintf("Path Stenciling Support     : %s\n", gNY[fPathStencilingSupport]);
+    GrPrintf("Path Rendering Support      : %s\n", gNY[fPathRenderingSupport]);
     GrPrintf("Dst Read In Shader Support  : %s\n", gNY[fDstReadInShaderSupport]);
     GrPrintf("Reuse Scratch Textures      : %s\n", gNY[fReuseScratchTextures]);
     GrPrintf("Max Texture Size            : %d\n", fMaxTextureSize);
     GrPrintf("Max Render Target Size      : %d\n", fMaxRenderTargetSize);
     GrPrintf("Max Sample Count            : %d\n", fMaxSampleCount);
 }