tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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DisplaySVGItem.cpp (2234B)

      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 // Main header first:
      8 #include "DisplaySVGItem.h"
      9 
     10 #include "mozilla/ISVGDisplayableFrame.h"
     11 #include "mozilla/SVGUtils.h"
     12 #include "nsLayoutUtils.h"
     13 #include "nsPoint.h"
     14 
     15 using namespace mozilla::gfx;
     16 using namespace mozilla::image;
     17 
     18 namespace mozilla {
     19 
     20 void DisplaySVGItem::HitTest(nsDisplayListBuilder* aBuilder,
     21                             const nsRect& aRect, HitTestState* aState,
     22                             nsTArray<nsIFrame*>* aOutFrames) {
     23  ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
     24  MOZ_ASSERT(svgFrame, "Unexpected frame type");
     25 
     26  nsPoint pointRelativeToReferenceFrame = aRect.Center();
     27  // ToReferenceFrame() includes mFrame->GetPosition(), our user
     28  // space position.
     29  nsPoint userSpacePtInAppUnits = pointRelativeToReferenceFrame -
     30                                  (ToReferenceFrame() - mFrame->GetPosition());
     31  gfxPoint userSpacePt =
     32      gfxPoint(userSpacePtInAppUnits.x, userSpacePtInAppUnits.y) /
     33      AppUnitsPerCSSPixel();
     34  if (auto* target = svgFrame->GetFrameForPoint(userSpacePt)) {
     35    aOutFrames->AppendElement(target);
     36  }
     37 }
     38 
     39 void DisplaySVGItem::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
     40  ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
     41  MOZ_ASSERT(svgFrame, "Unexpected frame type");
     42  int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
     43 
     44  // ToReferenceFrame() includes our mRect offset, but painting takes
     45  // account of that too. To avoid double counting, we subtract that
     46  // here.
     47  nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
     48 
     49  gfxPoint devPixelOffset =
     50      nsLayoutUtils::PointToGfxPoint(offset, appUnitsPerDevPixel);
     51 
     52  gfxMatrix tm = SVGUtils::GetCSSPxToDevPxMatrix(mFrame) *
     53                 gfxMatrix::Translation(devPixelOffset);
     54  imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
     55  svgFrame->PaintSVG(*aCtx, tm, imgParams);
     56 }
     57 
     58 }  // namespace mozilla