Move Canvas

Change-Id: I83d557af30fc2d5c69d06eedc0f4d52ac41c4210

5 files changed, 876 insertions, 3 deletions

diff --git a/libs/hwui/Android.common.mk b/libs/hwui/Android.common.mk
index b044e02..59a47de 100644
--- a/libs/hwui/Android.common.mk
+++ b/libs/hwui/Android.common.mk
@@ -52,6 +52,7 @@ LOCAL_SRC_FILES := \
     RenderState.cpp \
     ResourceCache.cpp \
     ShadowTessellator.cpp \
+    SkiaCanvas.cpp \
     SkiaShader.cpp \
     Snapshot.cpp \
     SpotShadow.cpp \
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index aa8db26..91e289c 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -4,7 +4,6 @@ LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_MODULE_CLASS := SHARED_LIBRARIES
 LOCAL_MODULE := libhwui
-LOCAL_MODULE_TAGS := optional
 
 include $(LOCAL_PATH)/Android.common.mk
 
diff --git a/libs/hwui/Canvas.h b/libs/hwui/Canvas.h
new file mode 100644
index 0000000..f9c8620
--- /dev/null
+++ b/libs/hwui/Canvas.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_GRAPHICS_CANVAS_H
+#define ANDROID_GRAPHICS_CANVAS_H
+
+#include <cutils/compiler.h>
+
+#include <SkBitmap.h>
+#include <SkCanvas.h>
+#include <SkMatrix.h>
+
+namespace android {
+
+class ANDROID_API Canvas {
+public:
+    virtual ~Canvas() {};
+
+    static Canvas* create_canvas(SkBitmap* bitmap);
+
+    /**
+     *  Create a new Canvas object which delegates to an SkCanvas.
+     *
+     *  @param skiaCanvas Must not be NULL. All drawing calls will be
+     *      delegated to this object. This function will call ref() on the
+     *      SkCanvas, and the returned Canvas will unref() it upon
+     *      destruction.
+     *  @return new Canvas object. Will not return NULL.
+     */
+    static Canvas* create_canvas(SkCanvas* skiaCanvas);
+
+    // TODO: enable HWUI to either create similar canvas wrapper or subclass
+    //       directly from Canvas
+    //static Canvas* create_canvas(uirenderer::Renderer* renderer);
+
+    // TODO: this is a temporary affordance until all necessary logic can be
+    //       moved within this interface! Further, the return value should
+    //       NOT be unref'd and is valid until this canvas is destroyed or a
+    //       new bitmap is set.
+    virtual SkCanvas* getSkCanvas() = 0;
+
+    virtual void setBitmap(SkBitmap* bitmap, bool copyState) = 0;
+
+    virtual bool isOpaque() = 0;
+    virtual int width() = 0;
+    virtual int height() = 0;
+
+// ----------------------------------------------------------------------------
+// Canvas state operations
+// ----------------------------------------------------------------------------
+    // Save (layer)
+    virtual int getSaveCount() const = 0;
+    virtual int save(SkCanvas::SaveFlags flags) = 0;
+    virtual void restore() = 0;
+    virtual void restoreToCount(int saveCount) = 0;
+
+    virtual int saveLayer(float left, float top, float right, float bottom,
+                const SkPaint* paint, SkCanvas::SaveFlags flags) = 0;
+    virtual int saveLayerAlpha(float left, float top, float right, float bottom,
+            int alpha, SkCanvas::SaveFlags flags) = 0;
+
+    // Matrix
+    virtual void getMatrix(SkMatrix* outMatrix) const = 0;
+    virtual void setMatrix(const SkMatrix& matrix) = 0;
+
+    virtual void concat(const SkMatrix& matrix) = 0;
+    virtual void rotate(float degrees) = 0;
+    virtual void scale(float sx, float sy) = 0;
+    virtual void skew(float sx, float sy) = 0;
+    virtual void translate(float dx, float dy) = 0;
+
+    // clip
+    virtual bool getClipBounds(SkRect* outRect) const = 0;
+    virtual bool quickRejectRect(float left, float top, float right, float bottom) const = 0;
+    virtual bool quickRejectPath(const SkPath& path) const = 0;
+
+    virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op) = 0;
+    virtual bool clipPath(const SkPath* path, SkRegion::Op op) = 0;
+    virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) = 0;
+
+    // filters
+    virtual SkDrawFilter* getDrawFilter() = 0;
+    virtual void setDrawFilter(SkDrawFilter* drawFilter) = 0;
+
+// ----------------------------------------------------------------------------
+// Canvas draw operations
+// ----------------------------------------------------------------------------
+    virtual void drawColor(int color, SkXfermode::Mode mode) = 0;
+    virtual void drawPaint(const SkPaint& paint) = 0;
+
+    // Geometry
+    virtual void drawPoint(float x, float y, const SkPaint& paint) = 0;
+    virtual void drawPoints(const float* points, int count, const SkPaint& paint) = 0;
+    virtual void drawLine(float startX, float startY, float stopX, float stopY,
+                const SkPaint& paint) = 0;
+    virtual void drawLines(const float* points, int count, const SkPaint& paint) = 0;
+    virtual void drawRect(float left, float top, float right, float bottom,
+            const SkPaint& paint) = 0;
+    virtual void drawRoundRect(float left, float top, float right, float bottom,
+            float rx, float ry, const SkPaint& paint) = 0;
+    virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) = 0;
+    virtual void drawOval(float left, float top, float right, float bottom,
+            const SkPaint& paint) = 0;
+    virtual void drawArc(float left, float top, float right, float bottom,
+            float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) = 0;
+    virtual void drawPath(const SkPath& path, const SkPaint& paint) = 0;
+    virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
+                              const float* verts, const float* tex, const int* colors,
+                              const uint16_t* indices, int indexCount, const SkPaint& paint) = 0;
+
+    // Bitmap-based
+    virtual void drawBitmap(const SkBitmap& bitmap, float left, float top,
+            const SkPaint* paint) = 0;
+    virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix,
+            const SkPaint* paint) = 0;
+    virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop,
+            float srcRight, float srcBottom, float dstLeft, float dstTop,
+            float dstRight, float dstBottom, const SkPaint* paint) = 0;
+    virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight,
+            const float* vertices, const int* colors, const SkPaint* paint) = 0;
+
+    // Text
+    /**
+     * drawText: count is of glyphs
+     * totalAdvance is ignored in software renderering, used by hardware renderer for
+     * text decorations (underlines, strikethroughs).
+     */
+    virtual void drawText(const uint16_t* glyphs, const float* positions, int count,
+            const SkPaint& paint, float x, float y,
+            float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
+            float totalAdvance) = 0;
+    /** drawPosText: count is of UTF16 characters, posCount is floats (2 * glyphs) */
+    virtual void drawPosText(const uint16_t* text, const float* positions, int count,
+            int posCount, const SkPaint& paint) = 0;
+    /** drawTextOnPath: count is of glyphs */
+    virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path,
+            float hOffset, float vOffset, const SkPaint& paint) = 0;
+
+    /**
+     * Specifies if the positions passed to ::drawText are absolute or relative
+     * to the (x,y) value provided.
+     *
+     * If true the (x,y) values are ignored. Otherwise, those (x,y) values need
+     * to be added to each glyph's position to get its absolute position.
+     */
+    virtual bool drawTextAbsolutePos() const = 0;
+};
+
+}; // namespace android
+#endif // ANDROID_GRAPHICS_CANVAS_H
diff --git a/libs/hwui/DisplayListRenderer.h b/libs/hwui/DisplayListRenderer.h
index 8f8d24c..631290d 100644
--- a/libs/hwui/DisplayListRenderer.h
+++ b/libs/hwui/DisplayListRenderer.h
@@ -25,8 +25,7 @@
 #include <SkTLazy.h>
 #include <cutils/compiler.h>
 
-#include <private/graphics/Canvas.h>
-
+#include "Canvas.h"
 #include "CanvasState.h"
 #include "DisplayList.h"
 #include "DisplayListLogBuffer.h"
diff --git a/libs/hwui/SkiaCanvas.cpp b/libs/hwui/SkiaCanvas.cpp
new file mode 100644
index 0000000..7fdbf9a
--- /dev/null
+++ b/libs/hwui/SkiaCanvas.cpp
@@ -0,0 +1,711 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Canvas.h"
+
+#include <SkCanvas.h>
+#include <SkClipStack.h>
+#include <SkDevice.h>
+#include <SkDeque.h>
+#include <SkDrawFilter.h>
+#include <SkGraphics.h>
+#include <SkPorterDuff.h>
+#include <SkShader.h>
+#include <SkTArray.h>
+#include <SkTemplates.h>
+
+namespace android {
+
+// Holds an SkCanvas reference plus additional native data.
+class SkiaCanvas : public Canvas {
+public:
+    explicit SkiaCanvas(SkBitmap* bitmap);
+
+    /**
+     *  Create a new SkiaCanvas.
+     *
+     *  @param canvas SkCanvas to handle calls made to this SkiaCanvas. Must
+     *      not be NULL. This constructor will ref() the SkCanvas, and unref()
+     *      it in its destructor.
+     */
+    explicit SkiaCanvas(SkCanvas* canvas) : mCanvas(canvas) {
+        SkASSERT(canvas);
+        canvas->ref();
+    }
+
+    virtual SkCanvas* getSkCanvas() {
+        return mCanvas.get();
+    }
+
+    virtual void setBitmap(SkBitmap* bitmap, bool copyState);
+
+    virtual bool isOpaque();
+    virtual int width();
+    virtual int height();
+
+    virtual int getSaveCount() const;
+    virtual int save(SkCanvas::SaveFlags flags);
+    virtual void restore();
+    virtual void restoreToCount(int saveCount);
+
+    virtual int saveLayer(float left, float top, float right, float bottom,
+                const SkPaint* paint, SkCanvas::SaveFlags flags);
+    virtual int saveLayerAlpha(float left, float top, float right, float bottom,
+            int alpha, SkCanvas::SaveFlags flags);
+
+    virtual void getMatrix(SkMatrix* outMatrix) const;
+    virtual void setMatrix(const SkMatrix& matrix);
+    virtual void concat(const SkMatrix& matrix);
+    virtual void rotate(float degrees);
+    virtual void scale(float sx, float sy);
+    virtual void skew(float sx, float sy);
+    virtual void translate(float dx, float dy);
+
+    virtual bool getClipBounds(SkRect* outRect) const;
+    virtual bool quickRejectRect(float left, float top, float right, float bottom) const;
+    virtual bool quickRejectPath(const SkPath& path) const;
+    virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
+    virtual bool clipPath(const SkPath* path, SkRegion::Op op);
+    virtual bool clipRegion(const SkRegion* region, SkRegion::Op op);
+
+    virtual SkDrawFilter* getDrawFilter();
+    virtual void setDrawFilter(SkDrawFilter* drawFilter);
+
+    virtual void drawColor(int color, SkXfermode::Mode mode);
+    virtual void drawPaint(const SkPaint& paint);
+
+    virtual void drawPoint(float x, float y, const SkPaint& paint);
+    virtual void drawPoints(const float* points, int count, const SkPaint& paint);
+    virtual void drawLine(float startX, float startY, float stopX, float stopY,
+            const SkPaint& paint);
+    virtual void drawLines(const float* points, int count, const SkPaint& paint);
+    virtual void drawRect(float left, float top, float right, float bottom, const SkPaint& paint);
+    virtual void drawRoundRect(float left, float top, float right, float bottom,
+            float rx, float ry, const SkPaint& paint);
+    virtual void drawCircle(float x, float y, float radius, const SkPaint& paint);
+    virtual void drawOval(float left, float top, float right, float bottom, const SkPaint& paint);
+    virtual void drawArc(float left, float top, float right, float bottom,
+            float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint);
+    virtual void drawPath(const SkPath& path, const SkPaint& paint);
+    virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
+            const float* verts, const float* tex, const int* colors,
+            const uint16_t* indices, int indexCount, const SkPaint& paint);
+
+    virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint);
+    virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint);
+    virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop,
+            float srcRight, float srcBottom, float dstLeft, float dstTop,
+            float dstRight, float dstBottom, const SkPaint* paint);
+    virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight,
+            const float* vertices, const int* colors, const SkPaint* paint);
+
+    virtual void drawText(const uint16_t* text, const float* positions, int count,
+            const SkPaint& paint, float x, float y,
+            float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
+            float totalAdvance);
+    virtual void drawPosText(const uint16_t* text, const float* positions, int count,
+            int posCount, const SkPaint& paint);
+    virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path,
+            float hOffset, float vOffset, const SkPaint& paint);
+
+    virtual bool drawTextAbsolutePos() const { return true; }
+
+private:
+    struct SaveRec {
+        int                 saveCount;
+        SkCanvas::SaveFlags saveFlags;
+    };
+
+    void recordPartialSave(SkCanvas::SaveFlags flags);
+    void saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount);
+    void applyClips(const SkTArray<SkClipStack::Element>& clips);
+
+    void drawPoints(const float* points, int count, const SkPaint& paint,
+                    SkCanvas::PointMode mode);
+    void drawTextDecorations(float x, float y, float length, const SkPaint& paint);
+
+    SkAutoTUnref<SkCanvas> mCanvas;
+    SkAutoTDelete<SkDeque> mSaveStack; // lazily allocated, tracks partial saves.
+};
+
+// Construct an SkCanvas from the bitmap.
+static SkCanvas* createCanvas(SkBitmap* bitmap) {
+    if (bitmap) {
+        return SkNEW_ARGS(SkCanvas, (*bitmap));
+    }
+
+    // Create an empty bitmap device to prevent callers from crashing
+    // if they attempt to draw into this canvas.
+    SkBitmap emptyBitmap;
+    return new SkCanvas(emptyBitmap);
+}
+
+Canvas* Canvas::create_canvas(SkBitmap* bitmap) {
+    return new SkiaCanvas(bitmap);
+}
+
+Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) {
+    return new SkiaCanvas(skiaCanvas);
+}
+
+SkiaCanvas::SkiaCanvas(SkBitmap* bitmap) {
+    mCanvas.reset(createCanvas(bitmap));
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations: Replace Bitmap
+// ----------------------------------------------------------------------------
+
+class ClipCopier : public SkCanvas::ClipVisitor {
+public:
+    ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {}
+
+    virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) {
+        m_dstCanvas->clipRect(rect, op, antialias);
+    }
+    virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) {
+        m_dstCanvas->clipRRect(rrect, op, antialias);
+    }
+    virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) {
+        m_dstCanvas->clipPath(path, op, antialias);
+    }
+
+private:
+    SkCanvas* m_dstCanvas;
+};
+
+void SkiaCanvas::setBitmap(SkBitmap* bitmap, bool copyState) {
+    SkCanvas* newCanvas = createCanvas(bitmap);
+    SkASSERT(newCanvas);
+
+    if (copyState) {
+        // Copy the canvas matrix & clip state.
+        newCanvas->setMatrix(mCanvas->getTotalMatrix());
+        if (NULL != mCanvas->getDevice() && NULL != newCanvas->getDevice()) {
+            ClipCopier copier(newCanvas);
+            mCanvas->replayClips(&copier);
+        }
+    }
+
+    // unrefs the existing canvas
+    mCanvas.reset(newCanvas);
+
+    // clean up the old save stack
+    mSaveStack.reset(NULL);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations
+// ----------------------------------------------------------------------------
+
+bool SkiaCanvas::isOpaque() {
+    return mCanvas->getDevice()->accessBitmap(false).isOpaque();
+}
+
+int SkiaCanvas::width() {
+    return mCanvas->getBaseLayerSize().width();
+}
+
+int SkiaCanvas::height() {
+    return mCanvas->getBaseLayerSize().height();
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations: Save (layer)
+// ----------------------------------------------------------------------------
+
+int SkiaCanvas::getSaveCount() const {
+    return mCanvas->getSaveCount();
+}
+
+int SkiaCanvas::save(SkCanvas::SaveFlags flags) {
+    int count = mCanvas->save();
+    recordPartialSave(flags);
+    return count;
+}
+
+void SkiaCanvas::restore() {
+    const SaveRec* rec = (NULL == mSaveStack.get())
+            ? NULL
+            : static_cast<SaveRec*>(mSaveStack->back());
+    int currentSaveCount = mCanvas->getSaveCount() - 1;
+    SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount);
+
+    if (NULL == rec || rec->saveCount != currentSaveCount) {
+        // Fast path - no record for this frame.
+        mCanvas->restore();
+        return;
+    }
+
+    bool preserveMatrix = !(rec->saveFlags & SkCanvas::kMatrix_SaveFlag);
+    bool preserveClip   = !(rec->saveFlags & SkCanvas::kClip_SaveFlag);
+
+    SkMatrix savedMatrix;
+    if (preserveMatrix) {
+        savedMatrix = mCanvas->getTotalMatrix();
+    }
+
+    SkTArray<SkClipStack::Element> savedClips;
+    if (preserveClip) {
+        saveClipsForFrame(savedClips, currentSaveCount);
+    }
+
+    mCanvas->restore();
+
+    if (preserveMatrix) {
+        mCanvas->setMatrix(savedMatrix);
+    }
+
+    if (preserveClip && !savedClips.empty()) {
+        applyClips(savedClips);
+    }
+
+    mSaveStack->pop_back();
+}
+
+void SkiaCanvas::restoreToCount(int restoreCount) {
+    while (mCanvas->getSaveCount() > restoreCount) {
+        this->restore();
+    }
+}
+
+int SkiaCanvas::saveLayer(float left, float top, float right, float bottom,
+            const SkPaint* paint, SkCanvas::SaveFlags flags) {
+    SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom);
+    int count = mCanvas->saveLayer(&bounds, paint, flags | SkCanvas::kMatrixClip_SaveFlag);
+    recordPartialSave(flags);
+    return count;
+}
+
+int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom,
+        int alpha, SkCanvas::SaveFlags flags) {
+    SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom);
+    int count = mCanvas->saveLayerAlpha(&bounds, alpha, flags | SkCanvas::kMatrixClip_SaveFlag);
+    recordPartialSave(flags);
+    return count;
+}
+
+// ----------------------------------------------------------------------------
+// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags)
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::recordPartialSave(SkCanvas::SaveFlags flags) {
+    // A partial save is a save operation which doesn't capture the full canvas state.
+    // (either kMatrix_SaveFlags or kClip_SaveFlag is missing).
+
+    // Mask-out non canvas state bits.
+    flags = static_cast<SkCanvas::SaveFlags>(flags & SkCanvas::kMatrixClip_SaveFlag);
+
+    if (SkCanvas::kMatrixClip_SaveFlag == flags) {
+        // not a partial save.
+        return;
+    }
+
+    if (NULL == mSaveStack.get()) {
+        mSaveStack.reset(SkNEW_ARGS(SkDeque, (sizeof(struct SaveRec), 8)));
+    }
+
+    SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back());
+    // Store the save counter in the SkClipStack domain.
+    // (0-based, equal to the number of save ops on the stack).
+    rec->saveCount = mCanvas->getSaveCount() - 1;
+    rec->saveFlags = flags;
+}
+
+void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount) {
+    SkClipStack::Iter clipIterator(*mCanvas->getClipStack(),
+                                   SkClipStack::Iter::kTop_IterStart);
+    while (const SkClipStack::Element* elem = clipIterator.next()) {
+        if (elem->getSaveCount() < frameSaveCount) {
+            // done with the current frame.
+            break;
+        }
+        SkASSERT(elem->getSaveCount() == frameSaveCount);
+        clips.push_back(*elem);
+    }
+}
+
+void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) {
+    ClipCopier clipCopier(mCanvas);
+
+    // The clip stack stores clips in device space.
+    SkMatrix origMatrix = mCanvas->getTotalMatrix();
+    mCanvas->resetMatrix();
+
+    // We pushed the clips in reverse order.
+    for (int i = clips.count() - 1; i >= 0; --i) {
+        clips[i].replay(&clipCopier);
+    }
+
+    mCanvas->setMatrix(origMatrix);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations: Matrix
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const {
+    *outMatrix = mCanvas->getTotalMatrix();
+}
+
+void SkiaCanvas::setMatrix(const SkMatrix& matrix) {
+    mCanvas->setMatrix(matrix);
+}
+
+void SkiaCanvas::concat(const SkMatrix& matrix) {
+    mCanvas->concat(matrix);
+}
+
+void SkiaCanvas::rotate(float degrees) {
+    mCanvas->rotate(degrees);
+}
+
+void SkiaCanvas::scale(float sx, float sy) {
+    mCanvas->scale(sx, sy);
+}
+
+void SkiaCanvas::skew(float sx, float sy) {
+    mCanvas->skew(sx, sy);
+}
+
+void SkiaCanvas::translate(float dx, float dy) {
+    mCanvas->translate(dx, dy);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations: Clips
+// ----------------------------------------------------------------------------
+
+// This function is a mirror of SkCanvas::getClipBounds except that it does
+// not outset the edge of the clip to account for anti-aliasing. There is
+// a skia bug to investigate pushing this logic into back into skia.
+// (see https://code.google.com/p/skia/issues/detail?id=1303)
+bool SkiaCanvas::getClipBounds(SkRect* outRect) const {
+    SkIRect ibounds;
+    if (!mCanvas->getClipDeviceBounds(&ibounds)) {
+        return false;
+    }
+
+    SkMatrix inverse;
+    // if we can't invert the CTM, we can't return local clip bounds
+    if (!mCanvas->getTotalMatrix().invert(&inverse)) {
+        if (outRect) {
+            outRect->setEmpty();
+        }
+        return false;
+    }
+
+    if (NULL != outRect) {
+        SkRect r = SkRect::Make(ibounds);
+        inverse.mapRect(outRect, r);
+    }
+    return true;
+}
+
+bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const {
+    SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom);
+    return mCanvas->quickReject(bounds);
+}
+
+bool SkiaCanvas::quickRejectPath(const SkPath& path) const {
+    return mCanvas->quickReject(path);
+}
+
+bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
+    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
+    mCanvas->clipRect(rect, op);
+    return mCanvas->isClipEmpty();
+}
+
+bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) {
+    mCanvas->clipPath(*path, op);
+    return mCanvas->isClipEmpty();
+}
+
+bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) {
+    SkPath rgnPath;
+    if (region->getBoundaryPath(&rgnPath)) {
+        // The region is specified in device space.
+        SkMatrix savedMatrix = mCanvas->getTotalMatrix();
+        mCanvas->resetMatrix();
+        mCanvas->clipPath(rgnPath, op);
+        mCanvas->setMatrix(savedMatrix);
+    } else {
+        mCanvas->clipRect(SkRect::MakeEmpty(), op);
+    }
+    return mCanvas->isClipEmpty();
+}
+
+// ----------------------------------------------------------------------------
+// Canvas state operations: Filters
+// ----------------------------------------------------------------------------
+
+SkDrawFilter* SkiaCanvas::getDrawFilter() {
+    return mCanvas->getDrawFilter();
+}
+
+void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) {
+    mCanvas->setDrawFilter(drawFilter);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas draw operations
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) {
+    mCanvas->drawColor(color, mode);
+}
+
+void SkiaCanvas::drawPaint(const SkPaint& paint) {
+    mCanvas->drawPaint(paint);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas draw operations: Geometry
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint,
+                            SkCanvas::PointMode mode) {
+    // convert the floats into SkPoints
+    count >>= 1;    // now it is the number of points
+    SkAutoSTMalloc<32, SkPoint> storage(count);
+    SkPoint* pts = storage.get();
+    for (int i = 0; i < count; i++) {
+        pts[i].set(points[0], points[1]);
+        points += 2;
+    }
+    mCanvas->drawPoints(mode, count, pts, paint);
+}
+
+
+void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) {
+    mCanvas->drawPoint(x, y, paint);
+}
+
+void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) {
+    this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode);
+}
+
+void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY,
+                          const SkPaint& paint) {
+    mCanvas->drawLine(startX, startY, stopX, stopY, paint);
+}
+
+void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) {
+    this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode);
+}
+
+void SkiaCanvas::drawRect(float left, float top, float right, float bottom,
+        const SkPaint& paint) {
+    mCanvas->drawRectCoords(left, top, right, bottom, paint);
+
+}
+
+void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom,
+        float rx, float ry, const SkPaint& paint) {
+    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
+    mCanvas->drawRoundRect(rect, rx, ry, paint);
+}
+
+void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) {
+    mCanvas->drawCircle(x, y, radius, paint);
+}
+
+void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) {
+    SkRect oval = SkRect::MakeLTRB(left, top, right, bottom);
+    mCanvas->drawOval(oval, paint);
+}
+
+void SkiaCanvas::drawArc(float left, float top, float right, float bottom,
+        float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) {
+    SkRect arc = SkRect::MakeLTRB(left, top, right, bottom);
+    mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint);
+}
+
+void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
+    mCanvas->drawPath(path, paint);
+}
+
+void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
+                              const float* verts, const float* texs, const int* colors,
+                              const uint16_t* indices, int indexCount, const SkPaint& paint) {
+#ifndef SK_SCALAR_IS_FLOAT
+    SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid");
+#endif
+    const int ptCount = vertexCount >> 1;
+    mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs,
+                          (SkColor*)colors, NULL, indices, indexCount, paint);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas draw operations: Bitmaps
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) {
+    mCanvas->drawBitmap(bitmap, left, top, paint);
+}
+
+void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) {
+    SkAutoCanvasRestore acr(mCanvas, true);
+    mCanvas->concat(matrix);
+    mCanvas->drawBitmap(bitmap, 0, 0, paint);
+}
+
+void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop,
+                            float srcRight, float srcBottom, float dstLeft, float dstTop,
+                            float dstRight, float dstBottom, const SkPaint* paint) {
+    SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom);
+    SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom);
+    mCanvas->drawBitmapRectToRect(bitmap, &srcRect, dstRect, paint);
+}
+
+void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight,
+        const float* vertices, const int* colors, const SkPaint* paint) {
+
+    const int ptCount = (meshWidth + 1) * (meshHeight + 1);
+    const int indexCount = meshWidth * meshHeight * 6;
+
+    /*  Our temp storage holds 2 or 3 arrays.
+        texture points [ptCount * sizeof(SkPoint)]
+        optionally vertex points [ptCount * sizeof(SkPoint)] if we need a
+            copy to convert from float to fixed
+        indices [ptCount * sizeof(uint16_t)]
+    */
+    ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[]
+    storageSize += indexCount * sizeof(uint16_t);  // indices[]
+
+
+#ifndef SK_SCALAR_IS_FLOAT
+    SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid");
+#endif
+    SkAutoMalloc storage(storageSize);
+    SkPoint* texs = (SkPoint*)storage.get();
+    uint16_t* indices = (uint16_t*)(texs + ptCount);
+
+    // cons up texture coordinates and indices
+    {
+        const SkScalar w = SkIntToScalar(bitmap.width());
+        const SkScalar h = SkIntToScalar(bitmap.height());
+        const SkScalar dx = w / meshWidth;
+        const SkScalar dy = h / meshHeight;
+
+        SkPoint* texsPtr = texs;
+        SkScalar y = 0;
+        for (int i = 0; i <= meshHeight; i++) {
+            if (i == meshHeight) {
+                y = h;  // to ensure numerically we hit h exactly
+            }
+            SkScalar x = 0;
+            for (int j = 0; j < meshWidth; j++) {
+                texsPtr->set(x, y);
+                texsPtr += 1;
+                x += dx;
+            }
+            texsPtr->set(w, y);
+            texsPtr += 1;
+            y += dy;
+        }
+        SkASSERT(texsPtr - texs == ptCount);
+    }
+
+    // cons up indices
+    {
+        uint16_t* indexPtr = indices;
+        int index = 0;
+        for (int i = 0; i < meshHeight; i++) {
+            for (int j = 0; j < meshWidth; j++) {
+                // lower-left triangle
+                *indexPtr++ = index;
+                *indexPtr++ = index + meshWidth + 1;
+                *indexPtr++ = index + meshWidth + 2;
+                // upper-right triangle
+                *indexPtr++ = index;
+                *indexPtr++ = index + meshWidth + 2;
+                *indexPtr++ = index + 1;
+                // bump to the next cell
+                index += 1;
+            }
+            // bump to the next row
+            index += 1;
+        }
+        SkASSERT(indexPtr - indices == indexCount);
+        SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize);
+    }
+
+    // double-check that we have legal indices
+#ifdef SK_DEBUG
+    {
+        for (int i = 0; i < indexCount; i++) {
+            SkASSERT((unsigned)indices[i] < (unsigned)ptCount);
+        }
+    }
+#endif
+
+    // cons-up a shader for the bitmap
+    SkPaint tmpPaint;
+    if (paint) {
+        tmpPaint = *paint;
+    }
+    SkShader* shader = SkShader::CreateBitmapShader(bitmap,
+                                                    SkShader::kClamp_TileMode,
+                                                    SkShader::kClamp_TileMode);
+    SkSafeUnref(tmpPaint.setShader(shader));
+
+    mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices,
+                         texs, (const SkColor*)colors, NULL, indices,
+                         indexCount, tmpPaint);
+}
+
+// ----------------------------------------------------------------------------
+// Canvas draw operations: Text
+// ----------------------------------------------------------------------------
+
+void SkiaCanvas::drawText(const uint16_t* text, const float* positions, int count,
+        const SkPaint& paint, float x, float y,
+        float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
+        float totalAdvance) {
+    // Set align to left for drawing, as we don't want individual
+    // glyphs centered or right-aligned; the offset above takes
+    // care of all alignment.
+    SkPaint paintCopy(paint);
+    paintCopy.setTextAlign(SkPaint::kLeft_Align);
+
+    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
+    mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paintCopy);
+}
+
+void SkiaCanvas::drawPosText(const uint16_t* text, const float* positions, int count, int posCount,
+        const SkPaint& paint) {
+    SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL;
+    int indx;
+    for (indx = 0; indx < posCount; indx++) {
+        posPtr[indx].fX = positions[indx << 1];
+        posPtr[indx].fY = positions[(indx << 1) + 1];
+    }
+
+    SkPaint paintCopy(paint);
+    paintCopy.setTextEncoding(SkPaint::kUTF16_TextEncoding);
+    mCanvas->drawPosText(text, count, posPtr, paintCopy);
+
+    delete[] posPtr;
+}
+
+void SkiaCanvas::drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path,
+        float hOffset, float vOffset, const SkPaint& paint) {
+    mCanvas->drawTextOnPathHV(glyphs, count, path, hOffset, vOffset, paint);
+}
+
+} // namespace android