Begin atlasing

src/image/SkSurface_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 "SkSurface_Base.h"
 #include "SkImagePriv.h"
 #include "SkCanvas.h"
 #include "SkGpuDevice.h"
 
 class SkSurface_Gpu : public SkSurface_Base {
 public:
     SK_DECLARE_INST_COUNT(SkSurface_Gpu)
 
-    SkSurface_Gpu(GrRenderTarget*, bool cached, TextRenderMode trm);
+    SkSurface_Gpu(GrRenderTarget*, bool cached, TextRenderMode trm, bool clear);
     virtual ~SkSurface_Gpu();
 
     virtual SkCanvas* onNewCanvas() SK_OVERRIDE;
     virtual SkSurface* onNewSurface(const SkImageInfo&) SK_OVERRIDE;
     virtual SkImage* onNewImageSnapshot() SK_OVERRIDE;
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
                         const SkPaint*) SK_OVERRIDE;
     virtual void onCopyOnWrite(ContentChangeMode) SK_OVERRIDE;
     virtual void onDiscard() SK_OVERRIDE;
 
 private:
     SkGpuDevice* fDevice;
 
     typedef SkSurface_Base INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkSurface_Gpu::SkSurface_Gpu(GrRenderTarget* renderTarget, bool cached, TextRenderMode trm)
+SkSurface_Gpu::SkSurface_Gpu(GrRenderTarget* renderTarget, bool cached, TextRenderMode trm,
+                             bool clear)
         : INHERITED(renderTarget->width(), renderTarget->height()) {
     int flags = 0;
     flags |= cached ? SkGpuDevice::kCached_Flag : 0;
     flags |= (kDistanceField_TextRenderMode == trm) ? SkGpuDevice::kDFFonts_Flag : 0;
     fDevice = SkGpuDevice::Create(renderTarget, flags);
 
-    if (kRGB_565_GrPixelConfig != renderTarget->config()) {
+    if (kRGB_565_GrPixelConfig != renderTarget->config() && clear) {
         fDevice->clear(0x0);
     }
 }
 
 SkSurface_Gpu::~SkSurface_Gpu() {
     SkSafeUnref(fDevice);
 }
 
 SkCanvas* SkSurface_Gpu::onNewCanvas() {
     return SkNEW_ARGS(SkCanvas, (fDevice));
@@ skipping 40 matching lines @@
         this->SkSurface_Gpu::onDiscard();
     }
 }
 
 void SkSurface_Gpu::onDiscard() {
     fDevice->accessRenderTarget()->discard();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget* target, TextRenderMode trm) {
+SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget* target, TextRenderMode trm, bool clear) {
     if (NULL == target) {
         return NULL;
     }
-    return SkNEW_ARGS(SkSurface_Gpu, (target, false, trm));
+    return SkNEW_ARGS(SkSurface_Gpu, (target, false, trm, clear));
 }
 
 SkSurface* SkSurface::NewRenderTarget(GrContext* ctx, const SkImageInfo& info, int sampleCount,
                                       TextRenderMode trm) {
     if (NULL == ctx) {
         return NULL;
     }
 
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit | kCheckAllocation_GrTextureFlagBit;
     desc.fWidth = info.width();
     desc.fHeight = info.height();
     desc.fConfig = SkImageInfo2GrPixelConfig(info);
     desc.fSampleCnt = sampleCount;
 
     SkAutoTUnref<GrTexture> tex(ctx->createUncachedTexture(desc, NULL, 0));
     if (NULL == tex) {
         return NULL;
     }
 
-    return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), false, trm));
+    return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), false, trm, true));
 }
 
 SkSurface* SkSurface::NewScratchRenderTarget(GrContext* ctx, const SkImageInfo& info,
                                              int sampleCount, TextRenderMode trm) {
     if (NULL == ctx) {
         return NULL;
     }
 
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit | kCheckAllocation_GrTextureFlagBit;
     desc.fWidth = info.width();
     desc.fHeight = info.height();
     desc.fConfig = SkImageInfo2GrPixelConfig(info);
     desc.fSampleCnt = sampleCount;
 
     SkAutoTUnref<GrTexture> tex(ctx->lockAndRefScratchTexture(desc, GrContext::kExact_ScratchTexMatch));
 
     if (NULL == tex) {
         return NULL;
     }
 
-    return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), true, trm));
+    return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), true, trm, true));
 }