Calculate and show Ambient shadow.
Basically we compute the shadow as a strip of triangles, whose alpha value
is the strength of the shadow.
We use the normal to extend the geometry.
And we use static function and try to avoid new/malloc in the computation.
Change-Id: I382286f1cad351bd5ff983f76f446c075819dcaf
diff --git a/libs/hwui/PathTessellator.h b/libs/hwui/PathTessellator.h
index e0044e8..236658d 100644
--- a/libs/hwui/PathTessellator.h
+++ b/libs/hwui/PathTessellator.h
@@ -22,84 +22,11 @@
#include "Matrix.h"
#include "Rect.h"
#include "Vertex.h"
+#include "VertexBuffer.h"
namespace android {
namespace uirenderer {
-class VertexBuffer {
-public:
- VertexBuffer():
- mBuffer(0),
- mVertexCount(0),
- mCleanupMethod(NULL)
- {}
-
- ~VertexBuffer() {
- if (mCleanupMethod) mCleanupMethod(mBuffer);
- }
-
- /**
- This should be the only method used by the PathTessellator. Subsequent calls to alloc will
- allocate space within the first allocation (useful if you want to eventually allocate
- multiple regions within a single VertexBuffer, such as with PathTessellator::tesselateLines()
- */
- template <class TYPE>
- TYPE* alloc(int vertexCount) {
- if (mVertexCount) {
- TYPE* reallocBuffer = (TYPE*)mReallocBuffer;
- // already have allocated the buffer, re-allocate space within
- if (mReallocBuffer != mBuffer) {
- // not first re-allocation, leave space for degenerate triangles to separate strips
- reallocBuffer += 2;
- }
- mReallocBuffer = reallocBuffer + vertexCount;
- return reallocBuffer;
- }
- mVertexCount = vertexCount;
- mReallocBuffer = mBuffer = (void*)new TYPE[vertexCount];
- mCleanupMethod = &(cleanup<TYPE>);
-
- return (TYPE*)mBuffer;
- }
-
- template <class TYPE>
- void copyInto(const VertexBuffer& srcBuffer, float xOffset, float yOffset) {
- int verticesToCopy = srcBuffer.getVertexCount();
-
- TYPE* dst = alloc<TYPE>(verticesToCopy);
- TYPE* src = (TYPE*)srcBuffer.getBuffer();
-
- for (int i = 0; i < verticesToCopy; i++) {
- TYPE::copyWithOffset(&dst[i], src[i], xOffset, yOffset);
- }
- }
-
- void* getBuffer() const { return mBuffer; } // shouldn't be const, since not a const ptr?
- unsigned int getVertexCount() const { return mVertexCount; }
-
- template <class TYPE>
- void createDegenerateSeparators(int allocSize) {
- TYPE* end = (TYPE*)mBuffer + mVertexCount;
- for (TYPE* degen = (TYPE*)mBuffer + allocSize; degen < end; degen += 2 + allocSize) {
- memcpy(degen, degen - 1, sizeof(TYPE));
- memcpy(degen + 1, degen + 2, sizeof(TYPE));
- }
- }
-
-private:
- template <class TYPE>
- static void cleanup(void* buffer) {
- delete[] (TYPE*)buffer;
- }
-
- void* mBuffer;
- unsigned int mVertexCount;
-
- void* mReallocBuffer; // used for multi-allocation
-
- void (*mCleanupMethod)(void*);
-};
-
class PathTessellator {
public:
static void expandBoundsForStroke(SkRect& bounds, const SkPaint* paint);