scaling API on SkPixmap

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapCache.h"
 #include "SkImage_Gpu.h"
 #include "GrCaps.h"
@@ skipping 27 matching lines @@
 extern void SkTextureImageApplyBudgetedDecision(SkImage* image) {
     if (as_IB(image)->getTexture()) {
         ((SkImage_Gpu*)image)->applyBudgetDecision();
     }
 }
 
 static SkImageInfo make_info(int w, int h, bool isOpaque) {
     return SkImageInfo::MakeN32(w, h, isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
 }
 
-bool SkImage_Gpu::getROPixels(SkBitmap* dst) const {
+bool SkImage_Gpu::getROPixels(SkBitmap* dst, CachingHint chint) const {
     if (SkBitmapCache::Find(this->uniqueID(), dst)) {
         SkASSERT(dst->getGenerationID() == this->uniqueID());
         SkASSERT(dst->isImmutable());
         SkASSERT(dst->getPixels());
         return true;
     }
 
     if (!dst->tryAllocPixels(make_info(this->width(), this->height(), this->isOpaque()))) {
         return false;
     }
     if (!fTexture->readPixels(0, 0, dst->width(), dst->height(), kSkia8888_GrPixelConfig,
                               dst->getPixels(), dst->rowBytes())) {
         return false;
     }
 
     dst->pixelRef()->setImmutableWithID(this->uniqueID());
-    SkBitmapCache::Add(this->uniqueID(), *dst);
-    fAddedRasterVersionToCache.store(true);
+    if (kAllow_CachingHint == chint) {
+        SkBitmapCache::Add(this->uniqueID(), *dst);
+        fAddedRasterVersionToCache.store(true);
+    }
     return true;
 }
 
 class GpuImage_GrTextureAdjuster : public GrTextureAdjuster {
 public:
     GpuImage_GrTextureAdjuster(const SkImage_Gpu* image)
         : INHERITED(image->peekTexture())
         , fImage(image)
     {}
 
@@ skipping 36 matching lines @@
     //
     SkColor* row = (SkColor*)pixels;
     for (int y = 0; y < info.height(); ++y) {
         for (int x = 0; x < info.width(); ++x) {
             row[x] = SkPreMultiplyColor(row[x]);
         }
     }
 }
 
 bool SkImage_Gpu::onReadPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
-                               int srcX, int srcY) const {
+                               int srcX, int srcY, CachingHint) const {
     GrPixelConfig config = SkImageInfo2GrPixelConfig(info.colorType(), info.alphaType(),
                                                      info.profileType());
     uint32_t flags = 0;
     if (kUnpremul_SkAlphaType == info.alphaType() && kPremul_SkAlphaType == fAlphaType) {
         // let the GPU perform this transformation for us
         flags = GrContext::kUnpremul_PixelOpsFlag;
     }
     if (!fTexture->readPixels(srcX, srcY, info.width(), info.height(), config,
                               pixels, rowBytes, flags)) {
         return false;
@@ skipping 249 matching lines @@
     if (!dst) {
         return nullptr;
     }
     
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP, GrContext::kFlushWrites_PixelOp);
     return dst;
 }