Preliminary Support for region clipping
Region clipping, using Canvas.clipPath or Canvas.clipRegion, requires
a stencil buffer to be always present. In addition, extra wiring is
required in JNI and display lists.
This change only adds the necessary JNI/C++ APIs and some extra
plumbing to start the real work on properly supporting region
clipping.
A new debug define called DEBUG_CLIP_REGIONS can be used to draw
the current clip region. It is off by default, as is region
clipping.
The default implementation of clipPath() and clipRegion(), now
in native, mimics the previous Dalvik implementation to prevent
regressions.
Change-Id: I7903e7cfd7412b9b9b622566d4dbfce7bdcec00c
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 5520edb..f07325f 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -164,6 +164,8 @@
ANDROID_API bool quickReject(float left, float top, float right, float bottom);
bool quickRejectNoScissor(float left, float top, float right, float bottom);
virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
+ virtual bool clipPath(SkPath* path, SkRegion::Op op);
+ virtual bool clipRegion(SkRegion* region, SkRegion::Op op);
virtual Rect* getClipRect();
virtual status_t drawDisplayList(DisplayList* displayList, Rect& dirty, int32_t flags,
@@ -498,7 +500,8 @@
/**
* Draws a colored rectangle with the specified color. The specified coordinates
- * are transformed by the current snapshot's transform matrix.
+ * are transformed by the current snapshot's transform matrix unless specified
+ * otherwise.
*
* @param left The left coordinate of the rectangle
* @param top The top coordinate of the rectangle
@@ -512,6 +515,20 @@
int color, SkXfermode::Mode mode, bool ignoreTransform = false);
/**
+ * Draws a series of colored rectangles with the specified color. The specified
+ * coordinates are transformed by the current snapshot's transform matrix unless
+ * specified otherwise.
+ *
+ * @param rects A list of rectangles, 4 floats (left, top, right, bottom)
+ * per rectangle
+ * @param color The rectangles' ARGB color, defined as a packed 32 bits word
+ * @param mode The Skia xfermode to use
+ * @param ignoreTransform True if the current transform should be ignored
+ */
+ status_t drawColorRects(const float* rects, int count, int color,
+ SkXfermode::Mode mode, bool ignoreTransform = false);
+
+ /**
* Draws the shape represented by the specified path texture.
* This method invokes drawPathTexture() but takes into account
* the extra left/top offset and the texture offset to correctly