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 #include "nsISVGPaintContext.h"
  19 #include "mozilla/ServoCSSParser.h"
  20
  21 namespace mozilla {
  22
  23 /* static */
  24 void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
  25                                              nsIFrame* aFromFrame,
  26                                              imgIContainer* aImgContainer) {
  27   return MaybeStoreContextPaint(aContext, *aFromFrame->PresContext(),
  28                                 *aFromFrame->Style(), aImgContainer);
  29 }
  30
  31 /* static */
  32 void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
  33                                              const nsPresContext& aPresContext,
  34                                              const ComputedStyle& aStyle,
  35                                              imgIContainer* aImgContainer) {
  36   if (aImgContainer->GetType() != imgIContainer::TYPE_VECTOR) {
  37     // Avoid this overhead for raster images.
  38     return;
  39   }
  40
  41   if (StaticPrefs::svg_embedder_prefers_color_scheme_content_enabled() ||
  42       aPresContext.Document()->ChromeRulesEnabled()) {
  43     auto scheme = LookAndFeel::ColorSchemeForStyle(
  44         *aPresContext.Document(), aStyle.StyleUI()->mColorScheme.bits,
  45         ColorSchemeMode::Preferred);
  46     aContext.SetColorScheme(Some(scheme));
  47   }
  48
  49   const nsStyleSVG* style = aStyle.StyleSVG();
  50   if (!style->ExposesContextProperties()) {
  51     // Content must have '-moz-context-properties' set to the names of the
  52     // properties it wants to expose to images it links to.
  53     return;
  54   }
  55
  56   bool haveContextPaint = false;
  57
  58   auto contextPaint = MakeRefPtr<SVGEmbeddingContextPaint>();
  59
  60   if ((style->mMozContextProperties.bits & StyleContextPropertyBits::FILL) &&
  61       style->mFill.kind.IsColor()) {
  62     haveContextPaint = true;
  63     contextPaint->SetFill(style->mFill.kind.AsColor().CalcColor(aStyle));
  64   }
  65   if ((style->mMozContextProperties.bits & StyleContextPropertyBits::STROKE) &&
  66       style->mStroke.kind.IsColor()) {
  67     haveContextPaint = true;
  68     contextPaint->SetStroke(style->mStroke.kind.AsColor().CalcColor(aStyle));
  69   }
  70   if (style->mMozContextProperties.bits &
  71       StyleContextPropertyBits::FILL_OPACITY) {
  72     haveContextPaint = true;
  73     contextPaint->SetFillOpacity(style->mFillOpacity.IsOpacity()
  74                                      ? style->mFillOpacity.AsOpacity()
  75                                      : 1.0f);
  76   }
  77   if (style->mMozContextProperties.bits &
  78       StyleContextPropertyBits::STROKE_OPACITY) {
  79     haveContextPaint = true;
  80     contextPaint->SetStrokeOpacity(style->mStrokeOpacity.IsOpacity()
  81                                        ? style->mStrokeOpacity.AsOpacity()
  82                                        : 1.0f);
  83   }
  84
  85   if (haveContextPaint) {
  86     aContext.mContextPaint = std::move(contextPaint);
  87   }
  88 }
  89
  90 /* static */
  91 void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
  92                                              nsISVGPaintContext* aPaintContext,
  93                                              imgIContainer* aImgContainer) {
  94   if (aImgContainer->GetType() != imgIContainer::TYPE_VECTOR ||
  95       !aPaintContext) {
  96     // Avoid this overhead for raster images.
  97     return;
  98   }
  99
 100   bool haveContextPaint = false;
 101   auto contextPaint = MakeRefPtr<SVGEmbeddingContextPaint>();
 102   nsCString value;
 103   float opacity;
 104
 105   if (NS_SUCCEEDED(aPaintContext->GetStrokeColor(value)) && !value.IsEmpty()) {
 106     nscolor color;
 107     if (ServoCSSParser::ComputeColor(nullptr, NS_RGB(0, 0, 0), value, &color)) {
 108       haveContextPaint = true;
 109       contextPaint->SetStroke(color);
 110     }
 111   }
 112
 113   if (NS_SUCCEEDED(aPaintContext->GetFillColor(value)) && !value.IsEmpty()) {
 114     nscolor color;
 115     if (ServoCSSParser::ComputeColor(nullptr, NS_RGB(0, 0, 0), value, &color)) {
 116       haveContextPaint = true;
 117       contextPaint->SetFill(color);
 118     }
 119   }
 120
 121   if (NS_SUCCEEDED(aPaintContext->GetStrokeOpacity(&opacity))) {
 122     haveContextPaint = true;
 123     contextPaint->SetStrokeOpacity(opacity);
 124   }
 125
 126   if (NS_SUCCEEDED(aPaintContext->GetFillOpacity(&opacity))) {
 127     haveContextPaint = true;
 128     contextPaint->SetFillOpacity(opacity);
 129   }
 130
 131   if (haveContextPaint) {
 132     aContext.mContextPaint = std::move(contextPaint);
 133   }
 134 }
 135
 136 }  // namespace mozilla