dom/canvas/DocumentRendererParent.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "mozilla/gfx/2D.h"
   6 #include "mozilla/ipc/DocumentRendererParent.h"
   7 #include "mozilla/RefPtr.h"
   8 #include "gfxPattern.h"
   9 #include "nsICanvasRenderingContextInternal.h"
  10
  11 using namespace mozilla;
  12 using namespace mozilla::gfx;
  13 using namespace mozilla::ipc;
  14
  15 DocumentRendererParent::DocumentRendererParent()
  16 {}
  17
  18 DocumentRendererParent::~DocumentRendererParent()
  19 {}
  20
  21 void DocumentRendererParent::SetCanvasContext(nsICanvasRenderingContextInternal* aCanvas,
  22                                               gfxContext* ctx)
  23 {
  24     mCanvas = aCanvas;
  25     mCanvasContext = ctx;
  26 }
  27
  28 void DocumentRendererParent::DrawToCanvas(const nsIntSize& aSize,
  29                                           const nsCString& aData)
  30 {
  31     if (!mCanvas || !mCanvasContext)
  32         return;
  33
  34     RefPtr<DataSourceSurface> dataSurface =
  35         Factory::CreateWrappingDataSourceSurface(reinterpret_cast<uint8_t*>(const_cast<nsCString&>(aData).BeginWriting()),
  36                                                  aSize.width * 4,
  37                                                  IntSize(aSize.width, aSize.height),
  38                                                  SurfaceFormat::B8G8R8A8);
  39     nsRefPtr<gfxPattern> pat = new gfxPattern(dataSurface, Matrix());
  40
  41     gfxRect rect(gfxPoint(0, 0), gfxSize(aSize.width, aSize.height));
  42     mCanvasContext->NewPath();
  43     mCanvasContext->PixelSnappedRectangleAndSetPattern(rect, pat);
  44     mCanvasContext->Fill();
  45
  46     // get rid of the pattern surface ref, because aData is very
  47     // likely to go away shortly
  48     mCanvasContext->SetColor(gfxRGBA(1,1,1,1));
  49
  50     gfxRect damageRect = mCanvasContext->UserToDevice(rect);
  51     mCanvas->Redraw(damageRect);
  52 }
  53
  54 void
  55 DocumentRendererParent::ActorDestroy(ActorDestroyReason aWhy)
  56 {
  57   // Implement me! Bug 1005139
  58 }
  59
  60 bool
  61 DocumentRendererParent::Recv__delete__(const nsIntSize& renderedSize,
  62                                        const nsCString& data)
  63 {
  64     DrawToCanvas(renderedSize, data);
  65     return true;
  66 }