layout/svg/SVGImageContext.cpp

   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 "SVGImageContext.h"
   9
  10 // Keep others in (case-insensitive) order:
  11 #include "gfxUtils.h"
  12 #include "mozilla/LookAndFeel.h"
  13 #include "mozilla/StaticPrefs_svg.h"
  14 #include "mozilla/dom/Document.h"
  15 #include "nsIFrame.h"
  16 #include "nsPresContext.h"
  17 #include "nsStyleStruct.h"
  18
  19 namespace mozilla {
  20
  21 /* static */
  22 void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
  23                                              nsIFrame* aFromFrame,
  24                                              imgIContainer* aImgContainer) {
  25   return MaybeStoreContextPaint(aContext, *aFromFrame->PresContext(),
  26                                 *aFromFrame->Style(), aImgContainer);
  27 }
  28
  29 /* static */
  30 void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
  31                                              const nsPresContext& aPresContext,
  32                                              const ComputedStyle& aStyle,
  33                                              imgIContainer* aImgContainer) {
  34   if (aImgContainer->GetType() != imgIContainer::TYPE_VECTOR) {
  35     // Avoid this overhead for raster images.
  36     return;
  37   }
  38
  39   if (StaticPrefs::svg_embedder_prefers_color_scheme_content_enabled() ||
  40       aPresContext.Document()->ChromeRulesEnabled()) {
  41     auto scheme = LookAndFeel::ColorSchemeForStyle(
  42         *aPresContext.Document(), aStyle.StyleUI()->mColorScheme.bits,
  43         ColorSchemeMode::Preferred);
  44     aContext.SetColorScheme(Some(scheme));
  45   }
  46
  47   const nsStyleSVG* style = aStyle.StyleSVG();
  48   if (!style->ExposesContextProperties()) {
  49     // Content must have '-moz-context-properties' set to the names of the
  50     // properties it wants to expose to images it links to.
  51     return;
  52   }
  53
  54   bool haveContextPaint = false;
  55
  56   auto contextPaint = MakeRefPtr<SVGEmbeddingContextPaint>();
  57
  58   if ((style->mMozContextProperties.bits & StyleContextPropertyBits::FILL) &&
  59       style->mFill.kind.IsColor()) {
  60     haveContextPaint = true;
  61     contextPaint->SetFill(style->mFill.kind.AsColor().CalcColor(aStyle));
  62   }
  63   if ((style->mMozContextProperties.bits & StyleContextPropertyBits::STROKE) &&
  64       style->mStroke.kind.IsColor()) {
  65     haveContextPaint = true;
  66     contextPaint->SetStroke(style->mStroke.kind.AsColor().CalcColor(aStyle));
  67   }
  68   if (style->mMozContextProperties.bits &
  69       StyleContextPropertyBits::FILL_OPACITY) {
  70     haveContextPaint = true;
  71     contextPaint->SetFillOpacity(style->mFillOpacity.IsOpacity()
  72                                      ? style->mFillOpacity.AsOpacity()
  73                                      : 1.0f);
  74   }
  75   if (style->mMozContextProperties.bits &
  76       StyleContextPropertyBits::STROKE_OPACITY) {
  77     haveContextPaint = true;
  78     contextPaint->SetStrokeOpacity(style->mStrokeOpacity.IsOpacity()
  79                                        ? style->mStrokeOpacity.AsOpacity()
  80                                        : 1.0f);
  81   }
  82
  83   if (haveContextPaint) {
  84     aContext.mContextPaint = std::move(contextPaint);
  85   }
  86 }
  87
  88 }  // namespace mozilla