Add read/write-Pixels to GrDrawContext

src/gpu/GrDrawContext.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 "GrBatchTest.h"
 #include "GrColor.h"
 #include "GrDrawContext.h"
@@ skipping 19 matching lines @@
 
 #include "effects/GrRRectEffect.h"
 
 #include "instanced/InstancedRendering.h"
 
 #include "text/GrAtlasTextContext.h"
 #include "text/GrStencilAndCoverTextContext.h"
 
 #include "../private/GrAuditTrail.h"
 
+#include "SkGr.h"
 #include "SkLatticeIter.h"
 #include "SkMatrixPriv.h"
 
 #define ASSERT_OWNED_RESOURCE(R) SkASSERT(!(R) || (R)->getContext() == fDrawingManager->getContext())
 #define ASSERT_SINGLE_OWNER \
     SkDEBUGCODE(GrSingleOwner::AutoEnforce debug_SingleOwner(fSingleOwner);)
 #define ASSERT_SINGLE_OWNER_PRIV \
     SkDEBUGCODE(GrSingleOwner::AutoEnforce debug_SingleOwner(fDrawContext->fSingleOwner);)
 #define RETURN_IF_ABANDONED        if (fDrawingManager->wasAbandoned()) { return; }
 #define RETURN_IF_ABANDONED_PRIV   if (fDrawContext->fDrawingManager->wasAbandoned()) { return; }
@@ skipping 1068 matching lines @@
     SkAutoTUnref<GrDrawBatch> batch(
             GrRectBatchFactory::CreateNonAAFill(paint.getColor(), viewMatrix, rect, localRect,
                                                 localMatrix));
     GrPipelineBuilder pipelineBuilder(paint, useHWAA);
     if (ss) {
         pipelineBuilder.setUserStencil(ss);
     }
     this->getDrawTarget()->drawBatch(pipelineBuilder, this, clip, batch);
 }
 
+bool GrDrawContext::readPixels(const SkImageInfo& dstInfo, void* dstBuffer, size_t dstRowBytes,
+                               int x, int y) {
+    // TODO: teach fRenderTarget to take ImageInfo directly to specify the src pixels
+    GrPixelConfig config = SkImageInfo2GrPixelConfig(dstInfo, *fContext->caps());
+    if (kUnknown_GrPixelConfig == config) {
+        return false;
+    }
+
+    uint32_t flags = 0;
+    if (kUnpremul_SkAlphaType == dstInfo.alphaType()) {
+        flags = GrContext::kUnpremul_PixelOpsFlag;
+    }
+
+    return fRenderTarget->readPixels(x, y, dstInfo.width(), dstInfo.height(),
+                                     config, dstBuffer, dstRowBytes, flags);
+}
+
+bool GrDrawContext::writePixels(const SkImageInfo& srcInfo, const void* srcBuffer,
+                                size_t srcRowBytes, int x, int y) {
+    // TODO: teach fRenderTarget to take ImageInfo directly to specify the src pixels
+    GrPixelConfig config = SkImageInfo2GrPixelConfig(srcInfo, *fContext->caps());
+    if (kUnknown_GrPixelConfig == config) {
+        return false;
+    }
+    uint32_t flags = 0;
+    if (kUnpremul_SkAlphaType == srcInfo.alphaType()) {
+        flags = GrContext::kUnpremul_PixelOpsFlag;
+    }
+
+    return fRenderTarget->writePixels(x, y, srcInfo.width(), srcInfo.height(),
+                                      config, srcBuffer, srcRowBytes, flags);
+}
+
 // Can 'path' be drawn as a pair of filled nested rectangles?
 static bool fills_as_nested_rects(const SkMatrix& viewMatrix, const SkPath& path, SkRect rects[2]) {
 
     if (path.isInverseFillType()) {
         return false;
     }
 
     // TODO: this restriction could be lifted if we were willing to apply
     // the matrix to all the points individually rather than just to the rect
     if (!viewMatrix.rectStaysRect()) {
@@ skipping 245 matching lines @@
 
 void GrDrawContext::drawBatch(const GrPipelineBuilder& pipelineBuilder, const GrClip& clip,
                               GrDrawBatch* batch) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(fAuditTrail, "GrDrawContext::drawBatch");
 
     this->getDrawTarget()->drawBatch(pipelineBuilder, this, clip, batch);
 }