layout/svg/SVGPaintServerFrame.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef LAYOUT_SVG_SVGPAINTSERVERFRAME_H_
   8 #define LAYOUT_SVG_SVGPAINTSERVERFRAME_H_
   9
  10 #include "gfxRect.h"
  11 #include "mozilla/Attributes.h"
  12 #include "mozilla/SVGContainerFrame.h"
  13 #include "nsCOMPtr.h"
  14 #include "nsIFrame.h"
  15 #include "nsIFrame.h"
  16 #include "nsQueryFrame.h"
  17
  18 class gfxContext;
  19 class gfxPattern;
  20
  21 namespace mozilla {
  22 namespace gfx {
  23 class DrawTarget;
  24 }  // namespace gfx
  25
  26 /**
  27  * RAII class used to temporarily set and remove the
  28  * NS_FRAME_DRAWING_AS_PAINTSERVER frame state bit while a frame is being
  29  * drawn as a paint server.
  30  */
  31 class MOZ_RAII AutoSetRestorePaintServerState {
  32  public:
  33   explicit AutoSetRestorePaintServerState(nsIFrame* aFrame) : mFrame(aFrame) {
  34     mFrame->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
  35   }
  36   ~AutoSetRestorePaintServerState() {
  37     mFrame->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
  38   }
  39
  40  private:
  41   nsIFrame* mFrame;
  42 };
  43
  44 class SVGPaintServerFrame : public SVGContainerFrame {
  45  protected:
  46   using DrawTarget = gfx::DrawTarget;
  47
  48   SVGPaintServerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
  49                       ClassID aID)
  50       : SVGContainerFrame(aStyle, aPresContext, aID) {
  51     AddStateBits(NS_FRAME_IS_NONDISPLAY |
  52                  NS_STATE_SVG_RENDERING_OBSERVER_CONTAINER);
  53   }
  54
  55  public:
  56   using imgDrawingParams = image::imgDrawingParams;
  57
  58   NS_DECL_ABSTRACT_FRAME(SVGPaintServerFrame)
  59   NS_DECL_QUERYFRAME
  60   NS_DECL_QUERYFRAME_TARGET(SVGPaintServerFrame)
  61
  62   /**
  63    * Constructs a gfxPattern of the paint server rendering.
  64    *
  65    * @param aContextMatrix The transform matrix that is currently applied to
  66    *   the gfxContext that is being drawn to. This is needed by SVG patterns so
  67    *   that surfaces of the correct size can be created. (SVG gradients are
  68    *   vector based, so it's not used there.)
  69    */
  70   virtual already_AddRefed<gfxPattern> GetPaintServerPattern(
  71       nsIFrame* aSource, const DrawTarget* aDrawTarget,
  72       const gfxMatrix& aContextMatrix, StyleSVGPaint nsStyleSVG::*aFillOrStroke,
  73       float aOpacity, imgDrawingParams& aImgParams,
  74       const gfxRect* aOverrideBounds = nullptr) = 0;
  75
  76   // nsIFrame methods:
  77   void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  78                         const nsDisplayListSet& aLists) override {}
  79 };
  80
  81 }  // namespace mozilla
  82
  83 #endif  // LAYOUT_SVG_SVGPAINTSERVERFRAME_H_