Correctly apply filters to Alpha8 bitmaps.

This change also removes unnecessary operations from display lists.

Change-Id: I627f85861982731f0ee7705b48b36d9c56f22f39

4 files changed, 120 insertions, 61 deletions

diff --git a/core/java/android/view/GLES20Canvas.java b/core/java/android/view/GLES20Canvas.java
index 14f2e9d..d841419 100644
--- a/core/java/android/view/GLES20Canvas.java
+++ b/core/java/android/view/GLES20Canvas.java
@@ -39,6 +39,12 @@ import android.text.TextUtils;
  * An implementation of Canvas on top of OpenGL ES 2.0.
  */
 class GLES20Canvas extends HardwareCanvas {
+    // Must match modifiers used in the JNI layer
+    private static final int MODIFIER_NONE = 0;
+    private static final int MODIFIER_SHADOW = 1;
+    private static final int MODIFIER_SHADER = 2;
+    private static final int MODIFIER_COLOR_FILTER = 4;
+
     private final boolean mOpaque;
     private int mRenderer;
 
@@ -259,10 +265,10 @@ class GLES20Canvas extends HardwareCanvas {
     
     void drawHardwareLayer(HardwareLayer layer, float x, float y, Paint paint) {
         final GLES20Layer glLayer = (GLES20Layer) layer;
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifier = paint != null ? setupColorFilter(paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawLayer(mRenderer, glLayer.getLayer(), x, y, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifier != MODIFIER_NONE) nResetModifiers(mRenderer, modifier);
     }
 
     private static native void nDrawLayer(int renderer, int layer, float x, float y, int paint);
@@ -455,10 +461,10 @@ class GLES20Canvas extends HardwareCanvas {
     public int saveLayer(float left, float top, float right, float bottom, Paint paint,
             int saveFlags) {
         if (left < right && top < bottom) {
-            boolean hasColorFilter = paint != null && setupColorFilter(paint);
+            int modifier = paint != null ? setupColorFilter(paint) : MODIFIER_NONE;
             final int nativePaint = paint == null ? 0 : paint.mNativePaint;
             int count = nSaveLayer(mRenderer, left, top, right, bottom, nativePaint, saveFlags);
-            if (hasColorFilter) nResetModifiers(mRenderer);
+            if (modifier != MODIFIER_NONE) nResetModifiers(mRenderer, modifier);
             return count;
         }
         return save(saveFlags);
@@ -527,10 +533,10 @@ class GLES20Canvas extends HardwareCanvas {
     @Override
     public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter,
             Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawArc(mRenderer, oval.left, oval.top, oval.right, oval.bottom, startAngle, sweepAngle,
                 useCenter, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawArc(int renderer, float left, float top,
@@ -545,11 +551,11 @@ class GLES20Canvas extends HardwareCanvas {
     @Override
     public void drawPatch(Bitmap bitmap, byte[] chunks, RectF dst, Paint paint) {
         // Shaders are ignored when drawing patches
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifier = paint != null ? setupColorFilter(paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawPatch(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, chunks,
                 dst.left, dst.top, dst.right, dst.bottom, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifier != MODIFIER_NONE) nResetModifiers(mRenderer, modifier);
     }
 
     private static native void nDrawPatch(int renderer, int bitmap, byte[] buffer, byte[] chunks,
@@ -558,10 +564,10 @@ class GLES20Canvas extends HardwareCanvas {
     @Override
     public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) {
         // Shaders are ignored when drawing bitmaps
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, left, top, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawBitmap(
@@ -570,11 +576,11 @@ class GLES20Canvas extends HardwareCanvas {
     @Override
     public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) {
         // Shaders are ignored when drawing bitmaps
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer,
                 matrix.native_instance, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawBitmap(int renderer, int bitmap, byte[] buff,
@@ -583,7 +589,7 @@ class GLES20Canvas extends HardwareCanvas {
     @Override
     public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) {
         // Shaders are ignored when drawing bitmaps
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
 
         int left, top, right, bottom;
@@ -600,17 +606,17 @@ class GLES20Canvas extends HardwareCanvas {
 
         nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, left, top, right, bottom,
                 dst.left, dst.top, dst.right, dst.bottom, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     @Override
     public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) {
         // Shaders are ignored when drawing bitmaps
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, src.left, src.top, src.right,
                 src.bottom, dst.left, dst.top, dst.right, dst.bottom, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawBitmap(int renderer, int bitmap, byte[] buffer,
@@ -621,13 +627,13 @@ class GLES20Canvas extends HardwareCanvas {
     public void drawBitmap(int[] colors, int offset, int stride, float x, float y,
             int width, int height, boolean hasAlpha, Paint paint) {
         // Shaders are ignored when drawing bitmaps
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifier = paint != null ? setupColorFilter(paint) : MODIFIER_NONE;
         final Bitmap.Config config = hasAlpha ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
         final Bitmap b = Bitmap.createBitmap(colors, offset, stride, width, height, config);
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;
         nDrawBitmap(mRenderer, b.mNativeBitmap, b.mBuffer, x, y, nativePaint);
         b.recycle();
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifier != MODIFIER_NONE) nResetModifiers(mRenderer, modifier);
     }
 
     @Override
@@ -655,11 +661,11 @@ class GLES20Canvas extends HardwareCanvas {
         colors = null;
         colorOffset = 0;
 
-        boolean hasColorFilter = paint != null && setupColorFilter(paint);
+        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
         final int nativePaint = paint == null ? 0 : paint.mNativePaint;        
         nDrawBitmapMesh(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, meshWidth, meshHeight,
                 verts, vertOffset, colors, colorOffset, nativePaint);
-        if (hasColorFilter) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawBitmapMesh(int renderer, int bitmap, byte[] buffer,
@@ -668,9 +674,9 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawCircle(float cx, float cy, float radius, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawCircle(mRenderer, cx, cy, radius, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer);        
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);        
     }
 
     private static native void nDrawCircle(int renderer, float cx, float cy,
@@ -702,9 +708,9 @@ class GLES20Canvas extends HardwareCanvas {
         if ((offset | count) < 0 || offset + count > pts.length) {
             throw new IllegalArgumentException("The lines array must contain 4 elements per line.");
         }
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawLines(mRenderer, pts, offset, count, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawLines(int renderer, float[] points,
@@ -717,9 +723,9 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawOval(RectF oval, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawOval(mRenderer, oval.left, oval.top, oval.right, oval.bottom, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer); 
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers); 
     }
 
     private static native void nDrawOval(int renderer, float left, float top,
@@ -734,7 +740,7 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawPath(Path path, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         if (path.isSimplePath) {
             if (path.rects != null) {
                 nDrawRects(mRenderer, path.rects.mNativeRegion, paint.mNativePaint);
@@ -742,7 +748,7 @@ class GLES20Canvas extends HardwareCanvas {
         } else {
             nDrawPath(mRenderer, path.mNativePath, paint.mNativePaint);
         }
-        if (hasModifier) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawPath(int renderer, int path, int paint);
@@ -792,9 +798,9 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawRect(float left, float top, float right, float bottom, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawRect(mRenderer, left, top, right, bottom, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer);
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
     }
 
     private static native void nDrawRect(int renderer, float left, float top,
@@ -817,10 +823,10 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         nDrawRoundRect(mRenderer, rect.left, rect.top, rect.right, rect.bottom,
                 rx, ry, paint.mNativePaint);
-        if (hasModifier) nResetModifiers(mRenderer);        
+        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);        
     }
 
     private static native void nDrawRoundRect(int renderer, float left, float top,
@@ -832,11 +838,11 @@ class GLES20Canvas extends HardwareCanvas {
             throw new IndexOutOfBoundsException();
         }
 
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             nDrawText(mRenderer, text, index, count, x, y, paint.mBidiFlags, paint.mNativePaint);
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
     
@@ -845,7 +851,7 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawText(CharSequence text, int start, int end, float x, float y, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             if (text instanceof String || text instanceof SpannedString ||
                     text instanceof SpannableString) {
@@ -862,7 +868,7 @@ class GLES20Canvas extends HardwareCanvas {
                 TemporaryBuffer.recycle(buf);
             }
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
 
@@ -872,11 +878,11 @@ class GLES20Canvas extends HardwareCanvas {
             throw new IndexOutOfBoundsException();
         }
 
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             nDrawText(mRenderer, text, start, end, x, y, paint.mBidiFlags, paint.mNativePaint);
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
 
@@ -885,12 +891,12 @@ class GLES20Canvas extends HardwareCanvas {
 
     @Override
     public void drawText(String text, float x, float y, Paint paint) {
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             nDrawText(mRenderer, text, 0, text.length(), x, y, paint.mBidiFlags,
                     paint.mNativePaint);
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
 
@@ -915,12 +921,12 @@ class GLES20Canvas extends HardwareCanvas {
             throw new IllegalArgumentException("Unknown direction: " + dir);
         }
 
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             nDrawTextRun(mRenderer, text, index, count, contextIndex, contextCount, x, y, dir,
                     paint.mNativePaint);
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
 
@@ -934,7 +940,7 @@ class GLES20Canvas extends HardwareCanvas {
             throw new IndexOutOfBoundsException();
         }
 
-        boolean hasModifier = setupModifiers(paint);
+        int modifiers = setupModifiers(paint);
         try {
             int flags = dir == 0 ? 0 : 1;
             if (text instanceof String || text instanceof SpannedString ||
@@ -954,7 +960,7 @@ class GLES20Canvas extends HardwareCanvas {
                 TemporaryBuffer.recycle(buf);
             }
         } finally {
-            if (hasModifier) nResetModifiers(mRenderer);
+            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
         }
     }
 
@@ -968,43 +974,50 @@ class GLES20Canvas extends HardwareCanvas {
         // TODO: Implement
     }
 
-    private boolean setupModifiers(Paint paint) {
-        boolean hasModifier = false;
+    private int setupModifiers(Bitmap b, Paint paint) {
+        if (b.getConfig() == Bitmap.Config.ALPHA_8) {
+            return setupModifiers(paint);
+        }
+        return MODIFIER_NONE;
+    }
+
+    private int setupModifiers(Paint paint) {
+        int modifiers = MODIFIER_NONE;
 
         if (paint.hasShadow) {
             nSetupShadow(mRenderer, paint.shadowRadius, paint.shadowDx, paint.shadowDy,
                     paint.shadowColor);
-            hasModifier = true;
+            modifiers |= MODIFIER_SHADOW;
         }
 
         final Shader shader = paint.getShader();
         if (shader != null) {
             nSetupShader(mRenderer, shader.native_shader);
-            hasModifier = true;
+            modifiers |= MODIFIER_SHADER;
         }
 
         final ColorFilter filter = paint.getColorFilter();
         if (filter != null) {
             nSetupColorFilter(mRenderer, filter.nativeColorFilter);
-            hasModifier = true;
+            modifiers |= MODIFIER_COLOR_FILTER;
         }
 
-        return hasModifier;
+        return modifiers;
     }
 
-    private boolean setupColorFilter(Paint paint) {
+    private int setupColorFilter(Paint paint) {
         final ColorFilter filter = paint.getColorFilter();
         if (filter != null) {
             nSetupColorFilter(mRenderer, filter.nativeColorFilter);
-            return true;
+            return MODIFIER_COLOR_FILTER;
         }
-        return false;        
+        return MODIFIER_NONE;        
     }
-    
+
     private static native void nSetupShader(int renderer, int shader);
     private static native void nSetupColorFilter(int renderer, int colorFilter);
     private static native void nSetupShadow(int renderer, float radius,
             float dx, float dy, int color);
 
-    private static native void nResetModifiers(int renderer);
+    private static native void nResetModifiers(int renderer, int modifiers);
 }
diff --git a/core/jni/android_view_GLES20Canvas.cpp b/core/jni/android_view_GLES20Canvas.cpp
index ed93d64..d6d3e4f 100644
--- a/core/jni/android_view_GLES20Canvas.cpp
+++ b/core/jni/android_view_GLES20Canvas.cpp
@@ -67,6 +67,10 @@ using namespace uirenderer;
     #define RENDERER_LOGD(...)
 #endif
 
+#define MODIFIER_SHADOW 1
+#define MODIFIER_SHADER 2
+#define MODIFIER_COLOR_FILTER 4
+
 // ----------------------------------------------------------------------------
 
 static struct {
@@ -381,10 +385,10 @@ static void android_view_GLES20Canvas_drawLines(JNIEnv* env, jobject clazz,
 // ----------------------------------------------------------------------------
 
 static void android_view_GLES20Canvas_resetModifiers(JNIEnv* env, jobject clazz,
-        OpenGLRenderer* renderer) {
-    renderer->resetShader();
-    renderer->resetColorFilter();
-    renderer->resetShadow();
+        OpenGLRenderer* renderer, jint modifiers) {
+    if (modifiers & MODIFIER_SHADOW) renderer->resetShadow();
+    if (modifiers & MODIFIER_SHADER) renderer->resetShader();
+    if (modifiers & MODIFIER_COLOR_FILTER) renderer->resetColorFilter();
 }
 
 static void android_view_GLES20Canvas_setupShader(JNIEnv* env, jobject clazz,
@@ -645,7 +649,7 @@ static JNINativeMethod gMethods[] = {
     { "nDrawPath",          "(III)V",          (void*) android_view_GLES20Canvas_drawPath },
     { "nDrawLines",         "(I[FIII)V",       (void*) android_view_GLES20Canvas_drawLines },
 
-    { "nResetModifiers",    "(I)V",            (void*) android_view_GLES20Canvas_resetModifiers },
+    { "nResetModifiers",    "(II)V",           (void*) android_view_GLES20Canvas_resetModifiers },
     { "nSetupShader",       "(II)V",           (void*) android_view_GLES20Canvas_setupShader },
     { "nSetupColorFilter",  "(II)V",           (void*) android_view_GLES20Canvas_setupColorFilter },
     { "nSetupShadow",       "(IFFFI)V",        (void*) android_view_GLES20Canvas_setupShadow },
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index bdab520..e47a696 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -1070,6 +1070,42 @@ bool OpenGLRenderer::drawDisplayList(DisplayList* displayList, uint32_t width, u
     return false;
 }
 
+void OpenGLRenderer::drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint) {
+    int alpha;
+    SkXfermode::Mode mode;
+    getAlphaAndMode(paint, &alpha, &mode);
+
+    setTextureWrapModes(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
+
+    float x = left;
+    float y = top;
+
+    bool ignoreTransform = false;
+    if (mSnapshot->transform->isPureTranslate()) {
+        x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
+        y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
+        ignoreTransform = true;
+    }
+
+    setupDraw();
+    setupDrawWithTexture(true);
+    setupDrawAlpha8Color(paint->getColor(), alpha);
+    setupDrawColorFilter();
+    setupDrawShader();
+    setupDrawBlending(true, mode);
+    setupDrawProgram();
+    setupDrawModelView(x, y, x + texture->width, y + texture->height, ignoreTransform);
+    setupDrawTexture(texture->id);
+    setupDrawPureColorUniforms();
+    setupDrawColorFilterUniforms();
+    setupDrawShaderUniforms();
+    setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
+
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
+
+    finishDrawTexture();
+}
+
 void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint) {
     const float right = left + bitmap->width();
     const float bottom = top + bitmap->height();
@@ -1083,7 +1119,11 @@ void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint
     if (!texture) return;
     const AutoTexture autoCleanup(texture);
 
-    drawTextureRect(left, top, right, bottom, texture, paint);
+    if (bitmap->getConfig() == SkBitmap::kA8_Config) {
+        drawAlphaBitmap(texture, left, top, paint);
+    } else {
+        drawTextureRect(left, top, right, bottom, texture, paint);
+    }
 }
 
 void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 7362473..402563c 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -279,6 +279,8 @@ private:
     void drawShape(float left, float top, const PathTexture* texture, SkPaint* paint);
     void drawRectAsShape(float left, float top, float right, float bottom, SkPaint* p);
 
+    void drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint);
+
     /**
      * Draws a textured rectangle with the specified texture. The specified coordinates
      * are transformed by the current snapshot's transform matrix.