1 files changed, 197 insertions, 0 deletions
diff --git a/layout/svg/SVGContextPaint.h b/layout/svg/SVGContextPaint.h
new file mode 100644
index 000000000..3c7764744
--- /dev/null
+++ b/layout/svg/SVGContextPaint.h
@@ -0,0 +1,197 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_SVGCONTEXTPAINT_H_
+#define MOZILLA_SVGCONTEXTPAINT_H_
+
+#include "DrawMode.h"
+#include "gfxMatrix.h"
+#include "gfxPattern.h"
+#include "gfxTypes.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/gfx/2D.h"
+#include "nsStyleStruct.h"
+#include "nsTArray.h"
+
+class gfxContext;
+class nsIDocument;
+class nsSVGPaintServerFrame;
+
+namespace mozilla {
+
+/**
+ * This class is used to pass information about a context element through to
+ * SVG painting code in order to resolve the 'context-fill' and related
+ * keywords. See:
+ *
+ *   https://www.w3.org/TR/SVG2/painting.html#context-paint
+ *
+ * This feature allows the color in an SVG-in-OpenType glyph to come from the
+ * computed style for the text that is being drawn, for example, or for color
+ * in an SVG embedded by an <img> element to come from the embedding <img>
+ * element.
+ */
+class SVGContextPaint
+{
+protected:
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+
+  SVGContextPaint() {}
+
+public:
+  virtual ~SVGContextPaint() {}
+
+  virtual already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
+                                                      float aOpacity,
+                                                      const gfxMatrix& aCTM) = 0;
+  virtual already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
+                                                        float aOpacity,
+                                                        const gfxMatrix& aCTM) = 0;
+  virtual float GetFillOpacity() const = 0;
+  virtual float GetStrokeOpacity() const = 0;
+
+  already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
+                                              const gfxMatrix& aCTM) {
+    return GetFillPattern(aDrawTarget, GetFillOpacity(), aCTM);
+  }
+
+  already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
+                                                const gfxMatrix& aCTM) {
+    return GetStrokePattern(aDrawTarget, GetStrokeOpacity(), aCTM);
+  }
+
+  static SVGContextPaint* GetContextPaint(nsIContent* aContent);
+
+  // XXX This gets the geometry params from the gfxContext.  We should get that
+  // information from the actual paint context!
+  void InitStrokeGeometry(gfxContext *aContext,
+                          float devUnitsPerSVGUnit);
+
+  FallibleTArray<gfxFloat>& GetStrokeDashArray() {
+    return mDashes;
+  }
+
+  gfxFloat GetStrokeDashOffset() {
+    return mDashOffset;
+  }
+
+  gfxFloat GetStrokeWidth() {
+    return mStrokeWidth;
+  }
+
+private:
+  // Member-vars are initialized in InitStrokeGeometry.
+  FallibleTArray<gfxFloat> mDashes;
+  MOZ_INIT_OUTSIDE_CTOR gfxFloat mDashOffset;
+  MOZ_INIT_OUTSIDE_CTOR gfxFloat mStrokeWidth;
+};
+
+/**
+ * RAII class used to temporarily set and remove an SVGContextPaint while a
+ * piece of SVG is being painted.  The context paint is set on the SVG's owner
+ * document, as expected by SVGContextPaint::GetContextPaint.  Any pre-existing
+ * context paint is restored after this class removes the context paint that it
+ * set.
+ */
+class MOZ_RAII AutoSetRestoreSVGContextPaint
+{
+public:
+  AutoSetRestoreSVGContextPaint(SVGContextPaint* aContextPaint,
+                                nsIDocument* aSVGDocument);
+  ~AutoSetRestoreSVGContextPaint();
+private:
+  nsIDocument* mSVGDocument;
+  // The context paint that needs to be restored by our dtor after it removes
+  // aContextPaint:
+  void* mOuterContextPaint;
+};
+
+
+/**
+ * This class should be flattened into SVGContextPaint once we get rid of the
+ * other sub-class (SimpleTextContextPaint).
+ */
+struct SVGContextPaintImpl : public SVGContextPaint
+{
+protected:
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+public:
+  DrawMode Init(const DrawTarget* aDrawTarget,
+                const gfxMatrix& aContextMatrix,
+                nsIFrame* aFrame,
+                SVGContextPaint* aOuterContextPaint);
+
+  already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
+                                              float aOpacity,
+                                              const gfxMatrix& aCTM) override;
+  already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
+                                                float aOpacity,
+                                                const gfxMatrix& aCTM) override;
+
+  void SetFillOpacity(float aOpacity) { mFillOpacity = aOpacity; }
+  float GetFillOpacity() const override { return mFillOpacity; }
+
+  void SetStrokeOpacity(float aOpacity) { mStrokeOpacity = aOpacity; }
+  float GetStrokeOpacity() const override { return mStrokeOpacity; }
+
+  struct Paint {
+    Paint() : mPaintType(eStyleSVGPaintType_None) {}
+
+    void SetPaintServer(nsIFrame* aFrame,
+                        const gfxMatrix& aContextMatrix,
+                        nsSVGPaintServerFrame* aPaintServerFrame) {
+      mPaintType = eStyleSVGPaintType_Server;
+      mPaintDefinition.mPaintServerFrame = aPaintServerFrame;
+      mFrame = aFrame;
+      mContextMatrix = aContextMatrix;
+    }
+
+    void SetColor(const nscolor &aColor) {
+      mPaintType = eStyleSVGPaintType_Color;
+      mPaintDefinition.mColor = aColor;
+    }
+
+    void SetContextPaint(SVGContextPaint* aContextPaint,
+                         nsStyleSVGPaintType aPaintType) {
+      NS_ASSERTION(aPaintType == eStyleSVGPaintType_ContextFill ||
+                   aPaintType == eStyleSVGPaintType_ContextStroke,
+                   "Invalid context paint type");
+      mPaintType = aPaintType;
+      mPaintDefinition.mContextPaint = aContextPaint;
+    }
+
+    union {
+      nsSVGPaintServerFrame* mPaintServerFrame;
+      SVGContextPaint* mContextPaint;
+      nscolor mColor;
+    } mPaintDefinition;
+
+    // Initialized (if needed) in SetPaintServer():
+    MOZ_INIT_OUTSIDE_CTOR nsIFrame* mFrame;
+    // CTM defining the user space for the pattern we will use.
+    gfxMatrix mContextMatrix;
+    nsStyleSVGPaintType mPaintType;
+
+    // Device-space-to-pattern-space
+    gfxMatrix mPatternMatrix;
+    nsRefPtrHashtable<nsFloatHashKey, gfxPattern> mPatternCache;
+
+    already_AddRefed<gfxPattern> GetPattern(const DrawTarget* aDrawTarget,
+                                            float aOpacity,
+                                            nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
+                                            const gfxMatrix& aCTM);
+  };
+
+  Paint mFillPaint;
+  Paint mStrokePaint;
+
+  float mFillOpacity;
+  float mStrokeOpacity;
+};
+
+} // namespace mozilla
+
+#endif // MOZILLA_SVGCONTEXTPAINT_H_
+