[SVGDom] Initial linear gradient support

Kind of a big change, to connect several new bits into something useful:

  * ID tracking & lookup
  * new asPaint() node virtual to support shader (and in the future filter) based paint servers
  * <defs>, <linearGradient> and <stop> element support
  * 'href', 'offset', 'stop-color', 'stop-opacity' attribute support
  * IRI/FuncIRI and rgb(...) parsing

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2327233003

Review-Url: https://codereview.chromium.org/2327233003

1 files changed, 6 insertions, 1 deletions

diff --git a/experimental/svg/model/SkSVGRenderContext.h b/experimental/svg/model/SkSVGRenderContext.h
index 61f8746376..68209a73cc 100644
--- a/experimental/svg/model/SkSVGRenderContext.h
+++ b/experimental/svg/model/SkSVGRenderContext.h
@@ -12,6 +12,7 @@
 #include "SkRect.h"
 #include "SkSize.h"
 #include "SkSVGAttribute.h"
+#include "SkSVGIDMapper.h"
 #include "SkTLazy.h"
 #include "SkTypes.h"
 
@@ -56,7 +57,8 @@ struct SkSVGPresentationContext {
 
 class SkSVGRenderContext {
 public:
-    SkSVGRenderContext(SkCanvas*, const SkSVGLengthContext&, const SkSVGPresentationContext&);
+    SkSVGRenderContext(SkCanvas*, const SkSVGIDMapper&, const SkSVGLengthContext&,
+                       const SkSVGPresentationContext&);
     SkSVGRenderContext(const SkSVGRenderContext&);
     ~SkSVGRenderContext();
 
@@ -67,6 +69,8 @@ public:
 
     void applyPresentationAttributes(const SkSVGPresentationAttributes&);
 
+    const SkSVGNode* findNodeById(const SkString&) const;
+
     const SkPaint* fillPaint() const;
     const SkPaint* strokePaint() const;
 
@@ -76,6 +80,7 @@ private:
     void* operator new(size_t, void*)                        = delete;
     SkSVGRenderContext& operator=(const SkSVGRenderContext&) = delete;
 
+    const SkSVGIDMapper&                          fIDMapper;
     SkTCopyOnFirstWrite<SkSVGLengthContext>       fLengthContext;
     SkTCopyOnFirstWrite<SkSVGPresentationContext> fPresentationContext;
     SkCanvas*                                     fCanvas;