src/third_party/skia/src/image/SkSurface_Gpu.cpp

   1 /*
   2  * Copyright 2012 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkSurface_Base.h"
   9 #include "SkImagePriv.h"
  10 #include "SkCanvas.h"
  11 #include "SkGpuDevice.h"
  12
  13 class SkSurface_Gpu : public SkSurface_Base {
  14 public:
  15     SK_DECLARE_INST_COUNT(SkSurface_Gpu)
  16
  17     SkSurface_Gpu(GrRenderTarget*, bool cached, const SkSurfaceProps*, bool doClear);
  18     virtual ~SkSurface_Gpu();
  19
  20     virtual SkCanvas* onNewCanvas() SK_OVERRIDE;
  21     virtual SkSurface* onNewSurface(const SkImageInfo&) SK_OVERRIDE;
  22     virtual SkImage* onNewImageSnapshot() SK_OVERRIDE;
  23     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
  24                         const SkPaint*) SK_OVERRIDE;
  25     virtual void onCopyOnWrite(ContentChangeMode) SK_OVERRIDE;
  26     virtual void onDiscard() SK_OVERRIDE;
  27
  28 private:
  29     SkGpuDevice* fDevice;
  30
  31     typedef SkSurface_Base INHERITED;
  32 };
  33
  34 ///////////////////////////////////////////////////////////////////////////////
  35
  36 SkSurface_Gpu::SkSurface_Gpu(GrRenderTarget* renderTarget, bool cached, const SkSurfaceProps* props,
  37                              bool doClear)
  38         : INHERITED(renderTarget->width(), renderTarget->height(), props)
  39 {
  40     int deviceFlags = 0;
  41     deviceFlags |= cached ? SkGpuDevice::kCached_Flag : 0;
  42     deviceFlags |= this->props().isUseDistanceFieldFonts() ? SkGpuDevice::kDFFonts_Flag : 0;
  43     fDevice = SkGpuDevice::Create(renderTarget, this->props(), deviceFlags);
  44
  45     if (kRGB_565_GrPixelConfig != renderTarget->config() && doClear) {
  46         fDevice->clear(0x0);
  47     }
  48 }
  49
  50 SkSurface_Gpu::~SkSurface_Gpu() {
  51     SkSafeUnref(fDevice);
  52 }
  53
  54 SkCanvas* SkSurface_Gpu::onNewCanvas() {
  55     SkCanvas::InitFlags flags = SkCanvas::kDefault_InitFlags;
  56     // When we think this works...
  57 //    flags |= SkCanvas::kConservativeRasterClip_InitFlag;
  58
  59     return SkNEW_ARGS(SkCanvas, (fDevice, &this->props(), flags));
  60 }
  61
  62 SkSurface* SkSurface_Gpu::onNewSurface(const SkImageInfo& info) {
  63     GrRenderTarget* rt = fDevice->accessRenderTarget();
  64     int sampleCount = rt->numSamples();
  65     return SkSurface::NewRenderTarget(fDevice->context(), info, sampleCount, &this->props());
  66 }
  67
  68 SkImage* SkSurface_Gpu::onNewImageSnapshot() {
  69     return SkImage::NewTexture(fDevice->accessBitmap(false));
  70 }
  71
  72 void SkSurface_Gpu::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
  73                               const SkPaint* paint) {
  74     canvas->drawBitmap(fDevice->accessBitmap(false), x, y, paint);
  75 }
  76
  77 // Create a new SkGpuDevice and, if necessary, copy the contents of the old
  78 // device into it. Note that this flushes the SkGpuDevice but
  79 // doesn't force an OpenGL flush.
  80 void SkSurface_Gpu::onCopyOnWrite(ContentChangeMode mode) {
  81     GrRenderTarget* rt = fDevice->accessRenderTarget();
  82     // are we sharing our render target with the image?
  83     SkASSERT(this->getCachedImage());
  84     if (rt->asTexture() == SkTextureImageGetTexture(this->getCachedImage())) {
  85         // We call createCompatibleDevice because it uses the texture cache. This isn't
  86         // necessarily correct (http://skbug.com/2252), but never using the cache causes
  87         // a Chromium regression. (http://crbug.com/344020)
  88         SkGpuDevice* newDevice = static_cast<SkGpuDevice*>(
  89             fDevice->createCompatibleDevice(fDevice->imageInfo()));
  90         SkAutoTUnref<SkGpuDevice> aurd(newDevice);
  91         if (kRetain_ContentChangeMode == mode) {
  92             fDevice->context()->copyTexture(rt->asTexture(), newDevice->accessRenderTarget());
  93         }
  94         SkASSERT(this->getCachedCanvas());
  95         SkASSERT(this->getCachedCanvas()->getDevice() == fDevice);
  96
  97         this->getCachedCanvas()->setRootDevice(newDevice);
  98         SkRefCnt_SafeAssign(fDevice, newDevice);
  99     } else if (kDiscard_ContentChangeMode == mode) {
 100         this->SkSurface_Gpu::onDiscard();
 101     }
 102 }
 103
 104 void SkSurface_Gpu::onDiscard() {
 105     fDevice->accessRenderTarget()->discard();
 106 }
 107
 108 ///////////////////////////////////////////////////////////////////////////////
 109
 110 SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget* target, const SkSurfaceProps* props) {
 111     if (NULL == target) {
 112         return NULL;
 113     }
 114     return SkNEW_ARGS(SkSurface_Gpu, (target, false, props, false));
 115 }
 116
 117 SkSurface* SkSurface::NewRenderTarget(GrContext* ctx, const SkImageInfo& info, int sampleCount,
 118                                       const SkSurfaceProps* props) {
 119     if (NULL == ctx) {
 120         return NULL;
 121     }
 122
 123     GrTextureDesc desc;
 124     desc.fFlags = kRenderTarget_GrTextureFlagBit | kCheckAllocation_GrTextureFlagBit;
 125     desc.fWidth = info.width();
 126     desc.fHeight = info.height();
 127     desc.fConfig = SkImageInfo2GrPixelConfig(info);
 128     desc.fSampleCnt = sampleCount;
 129
 130     SkAutoTUnref<GrTexture> tex(ctx->createUncachedTexture(desc, NULL, 0));
 131     if (NULL == tex) {
 132         return NULL;
 133     }
 134
 135     return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), false, props, true));
 136 }
 137
 138 SkSurface* SkSurface::NewScratchRenderTarget(GrContext* ctx, const SkImageInfo& info,
 139                                              int sampleCount, const SkSurfaceProps* props) {
 140     if (NULL == ctx) {
 141         return NULL;
 142     }
 143
 144     GrTextureDesc desc;
 145     desc.fFlags = kRenderTarget_GrTextureFlagBit | kCheckAllocation_GrTextureFlagBit;
 146     desc.fWidth = info.width();
 147     desc.fHeight = info.height();
 148     desc.fConfig = SkImageInfo2GrPixelConfig(info);
 149     desc.fSampleCnt = sampleCount;
 150
 151     SkAutoTUnref<GrTexture> tex(ctx->lockAndRefScratchTexture(desc, GrContext::kExact_ScratchTexMatch));
 152
 153     if (NULL == tex) {
 154         return NULL;
 155     }
 156
 157     return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), true, props, true));
 158 }