Optimize blending state changes.
Change-Id: I7c22a8aecccb8b5abfcf7243f049a4ef3cf3979a
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index b46e9d3..6527cae 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -179,10 +179,40 @@
* @param isPremultiplied Indicates whether the texture has premultiplied alpha
*/
void drawTextureRect(float left, float top, float right, float bottom, GLuint texture,
- float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied = false);
+ float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied = true);
/**
- * TODO: documentation
+ * Draws a textured rectangle with the specified texture. The specified coordinates
+ * are transformed by the current snapshot's transform matrix.
+ *
+ * @param left The left coordinate of the rectangle
+ * @param top The top coordinate of the rectangle
+ * @param right The right coordinate of the rectangle
+ * @param bottom The bottom coordinate of the rectangle
+ * @param texture The texture to use
+ * @param paint The paint containing the alpha, blending mode, etc.
+ * @param isPremultiplied Indicates whether the texture has premultiplied alpha
+ */
+ void drawTextureRect(float left, float top, float right, float bottom, const Texture* texture,
+ const SkPaint* paint, bool isPremultiplied = true);
+
+ /**
+ * Draws a textured mesh with the specified texture. If the indices are omitted, the
+ * mesh is drawn as a simple quad.
+ *
+ * @param left The left coordinate of the rectangle
+ * @param top The top coordinate of the rectangle
+ * @param right The right coordinate of the rectangle
+ * @param bottom The bottom coordinate of the rectangle
+ * @param texture The texture name to map onto the rectangle
+ * @param alpha An additional translucency parameter, between 0.0f and 1.0f
+ * @param mode The blending mode
+ * @param blend True if the texture contains an alpha channel
+ * @param isPremultiplied Indicates whether the texture has premultiplied alpha
+ * @param vertices The vertices that define the mesh
+ * @param texCoords The texture coordinates of each vertex
+ * @param indices The indices of the vertices, can be NULL
+ * @param elementsCount The number of elements in the mesh, required by indices
*/
void drawTextureMesh(float left, float top, float right, float bottom, GLuint texture,
float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied,
@@ -217,6 +247,12 @@
inline void generateVertices(TextureVertex* vertex, float y, float v, const int32_t xDivs[],
uint32_t xCount, float xStretch, float xStretchTex, float width, float widthTex);
+ /**
+ * Enable or disable blending as necessary. This function sets the appropriate
+ * blend function based on the specified xfermode.
+ */
+ inline void chooseBlending(bool blend, SkXfermode::Mode mode, bool isPremultiplied);
+
// Dimensions of the drawing surface
int mWidth, mHeight;
@@ -240,6 +276,12 @@
// Used to draw textured quads
TextureVertex mDrawTextureVertices[4];
+ // Last known blend state
+ bool mBlend;
+ GLenum mLastSrcMode;
+ GLenum mLastDstMode;
+
+ // Various caches
TextureCache mTextureCache;
LayerCache mLayerCache;
PatchCache mPatchCache;