dom/canvas/DocumentRendererChild.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/ipc/DocumentRendererChild.h"
   6
   7 #include "base/basictypes.h"
   8
   9 #include "gfx2DGlue.h"
  10 #include "gfxPattern.h"
  11 #include "mozilla/gfx/2D.h"
  12 #include "mozilla/RefPtr.h"
  13 #include "nsPIDOMWindow.h"
  14 #include "nsIDOMWindow.h"
  15 #include "nsIDocShell.h"
  16 #include "nsIInterfaceRequestorUtils.h"
  17 #include "nsComponentManagerUtils.h"
  18 #include "nsCSSParser.h"
  19 #include "nsPresContext.h"
  20 #include "nsCOMPtr.h"
  21 #include "nsColor.h"
  22 #include "gfxContext.h"
  23 #include "nsLayoutUtils.h"
  24 #include "nsContentUtils.h"
  25 #include "nsCSSValue.h"
  26 #include "nsRuleNode.h"
  27 #include "mozilla/gfx/Matrix.h"
  28
  29 using namespace mozilla;
  30 using namespace mozilla::gfx;
  31 using namespace mozilla::ipc;
  32
  33 DocumentRendererChild::DocumentRendererChild()
  34 {}
  35
  36 DocumentRendererChild::~DocumentRendererChild()
  37 {}
  38
  39 bool
  40 DocumentRendererChild::RenderDocument(nsIDOMWindow *window,
  41                                       const nsRect& documentRect,
  42                                       const mozilla::gfx::Matrix& transform,
  43                                       const nsString& aBGColor,
  44                                       uint32_t renderFlags,
  45                                       bool flushLayout,
  46                                       const nsIntSize& renderSize,
  47                                       nsCString& data)
  48 {
  49     if (flushLayout)
  50         nsContentUtils::FlushLayoutForTree(window);
  51
  52     nsRefPtr<nsPresContext> presContext;
  53     nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(window);
  54     if (win) {
  55         nsIDocShell* docshell = win->GetDocShell();
  56         if (docshell) {
  57             docshell->GetPresContext(getter_AddRefs(presContext));
  58         }
  59     }
  60     if (!presContext)
  61         return false;
  62
  63     nsCSSParser parser;
  64     nsCSSValue bgColorValue;
  65     if (!parser.ParseColorString(aBGColor, nullptr, 0, bgColorValue)) {
  66         return false;
  67     }
  68
  69     nscolor bgColor;
  70     if (!nsRuleNode::ComputeColor(bgColorValue, presContext, nullptr, bgColor)) {
  71         return false;
  72     }
  73
  74     // Draw directly into the output array.
  75     data.SetLength(renderSize.width * renderSize.height * 4);
  76
  77     RefPtr<DrawTarget> dt =
  78         Factory::CreateDrawTargetForData(BackendType::CAIRO,
  79                                          reinterpret_cast<uint8_t*>(data.BeginWriting()),
  80                                          IntSize(renderSize.width, renderSize.height),
  81                                          4 * renderSize.width,
  82                                          SurfaceFormat::B8G8R8A8);
  83     nsRefPtr<gfxContext> ctx = new gfxContext(dt);
  84     ctx->SetMatrix(mozilla::gfx::ThebesMatrix(transform));
  85
  86     nsCOMPtr<nsIPresShell> shell = presContext->PresShell();
  87     shell->RenderDocument(documentRect, renderFlags, bgColor, ctx);
  88
  89     return true;
  90 }