Create proxy between Skia's SkCanvas and the framework Canvas.

This enables Picture.java to be replayed into HWUI in addition
to extending the Skia testing suite to HWUI.

Bug: 19011232
Change-Id: Id27ac03eec817b0784763e62ab8413a07b3b8cb2

1 files changed, 347 insertions, 0 deletions

diff --git a/libs/hwui/SkiaCanvasProxy.cpp b/libs/hwui/SkiaCanvasProxy.cpp
new file mode 100644
index 000000000000..de5f91c4ad8b
--- /dev/null
+++ b/libs/hwui/SkiaCanvasProxy.cpp
@@ -0,0 +1,347 @@
+/*
+ * Copyright (C) 2015 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 "SkiaCanvasProxy.h"
+
+#include <cutils/log.h>
+#include <SkPatchUtils.h>
+
+namespace android {
+namespace uirenderer {
+
+SkiaCanvasProxy::SkiaCanvasProxy(Canvas* canvas)
+        : INHERITED(canvas->width(), canvas->height())
+        , mCanvas(canvas) {}
+
+void SkiaCanvasProxy::onDrawPaint(const SkPaint& paint) {
+    mCanvas->drawPaint(paint);
+}
+
+void SkiaCanvasProxy::onDrawPoints(PointMode pointMode, size_t count, const SkPoint pts[],
+        const SkPaint& paint) {
+    // convert the SkPoints into floats
+    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
+    const size_t floatCount = count << 1;
+    const float* floatArray = &pts[0].fX;
+
+    switch (pointMode) {
+        case kPoints_PointMode: {
+            mCanvas->drawPoints(floatArray, floatCount, paint);
+            break;
+        }
+        case kLines_PointMode: {
+            mCanvas->drawLines(floatArray, floatCount, paint);
+            break;
+        }
+        case kPolygon_PointMode: {
+            SkPaint strokedPaint(paint);
+            strokedPaint.setStyle(SkPaint::kStroke_Style);
+
+            SkPath path;
+            for (size_t i = 0; i < count - 1; i++) {
+                path.moveTo(pts[i]);
+                path.lineTo(pts[i+1]);
+                this->drawPath(path, strokedPaint);
+                path.rewind();
+            }
+            break;
+        }
+        default:
+            LOG_ALWAYS_FATAL("Unknown point type");
+    }
+}
+
+void SkiaCanvasProxy::onDrawOval(const SkRect& rect, const SkPaint& paint) {
+    mCanvas->drawOval(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
+}
+
+void SkiaCanvasProxy::onDrawRect(const SkRect& rect, const SkPaint& paint) {
+    mCanvas->drawRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint);
+}
+
+void SkiaCanvasProxy::onDrawRRect(const SkRRect& roundRect, const SkPaint& paint) {
+    if (!roundRect.isComplex()) {
+        const SkRect& rect = roundRect.rect();
+        SkVector radii = roundRect.getSimpleRadii();
+        mCanvas->drawRoundRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
+                               radii.fX, radii.fY, paint);
+    } else {
+        SkPath path;
+        path.addRRect(roundRect);
+        mCanvas->drawPath(path, paint);
+    }
+}
+
+void SkiaCanvasProxy::onDrawPath(const SkPath& path, const SkPaint& paint) {
+    mCanvas->drawPath(path, paint);
+}
+
+void SkiaCanvasProxy::onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
+        const SkPaint* paint) {
+    mCanvas->drawBitmap(bitmap, left, top, paint);
+}
+
+void SkiaCanvasProxy::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* srcPtr,
+        const SkRect& dst, const SkPaint* paint, DrawBitmapRectFlags) {
+    SkRect src = (srcPtr) ? *srcPtr : SkRect::MakeWH(bitmap.width(), bitmap.height());
+    mCanvas->drawBitmap(bitmap, src.fLeft, src.fTop, src.fRight, src.fBottom,
+                        dst.fLeft, dst.fTop, dst.fRight, dst.fBottom, paint);
+}
+
+void SkiaCanvasProxy::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
+        const SkRect& dst, const SkPaint*) {
+    //TODO make nine-patch drawing a method on Canvas.h
+    SkDEBUGFAIL("SkiaCanvasProxy::onDrawBitmapNine is not yet supported");
+}
+
+void SkiaCanvasProxy::onDrawSprite(const SkBitmap& bitmap, int left, int top,
+        const SkPaint* paint) {
+    mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
+    mCanvas->setMatrix(SkMatrix::I());
+    mCanvas->drawBitmap(bitmap, left, top, paint);
+    mCanvas->restore();
+}
+
+void SkiaCanvasProxy::onDrawVertices(VertexMode mode, int vertexCount, const SkPoint vertices[],
+        const SkPoint texs[], const SkColor colors[], SkXfermode*, const uint16_t indices[],
+        int indexCount, const SkPaint& paint) {
+    // convert the SkPoints into floats
+    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
+    const int floatCount = vertexCount << 1;
+    const float* vArray = &vertices[0].fX;
+    const float* tArray = (texs) ? &texs[0].fX : NULL;
+    const int* cArray = (colors) ? (int*)colors : NULL;
+    mCanvas->drawVertices(mode, floatCount, vArray, tArray, cArray, indices, indexCount, paint);
+}
+
+SkSurface* SkiaCanvasProxy::onNewSurface(const SkImageInfo&, const SkSurfaceProps&) {
+    SkDEBUGFAIL("SkiaCanvasProxy::onNewSurface is not supported");
+    return NULL;
+}
+
+void SkiaCanvasProxy::willSave() {
+    mCanvas->save(SkCanvas::kMatrixClip_SaveFlag);
+}
+
+SkCanvas::SaveLayerStrategy SkiaCanvasProxy::willSaveLayer(const SkRect* rectPtr,
+        const SkPaint* paint, SaveFlags flags) {
+    SkRect rect;
+    if (rectPtr) {
+        rect = *rectPtr;
+    } else if(!mCanvas->getClipBounds(&rect)) {
+        rect = SkRect::MakeEmpty();
+    }
+    mCanvas->saveLayer(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, paint, flags);
+    return SkCanvas::kNoLayer_SaveLayerStrategy;
+}
+
+void SkiaCanvasProxy::willRestore() {
+    mCanvas->restore();
+}
+
+void SkiaCanvasProxy::didConcat(const SkMatrix& matrix) {
+    mCanvas->concat(matrix);
+}
+
+void SkiaCanvasProxy::didSetMatrix(const SkMatrix& matrix) {
+    mCanvas->setMatrix(matrix);
+}
+
+void SkiaCanvasProxy::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+        const SkPaint& paint) {
+    SkPath path;
+    path.addRRect(outer);
+    path.addRRect(inner);
+    path.setFillType(SkPath::kEvenOdd_FillType);
+    this->drawPath(path, paint);
+}
+
+/**
+ * Utility class that converts the incoming text & paint from the given encoding
+ * into glyphIDs.
+ */
+class GlyphIDConverter {
+public:
+    GlyphIDConverter(const void* text, size_t byteLength, const SkPaint& origPaint) {
+        paint = origPaint;
+        if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
+            glyphIDs = (uint16_t*)text;
+            count = byteLength >> 1;
+        } else {
+            storage.reset(byteLength); // ensures space for one glyph per ID given UTF8 encoding.
+            glyphIDs = storage.get();
+            count = paint.textToGlyphs(text, byteLength, storage.get());
+            paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+        }
+    }
+
+    SkPaint paint;
+    uint16_t* glyphIDs;
+    int count;
+private:
+    SkAutoSTMalloc<32, uint16_t> storage;
+};
+
+void SkiaCanvasProxy::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+        const SkPaint& origPaint) {
+    // convert to glyphIDs if necessary
+    GlyphIDConverter glyphs(text, byteLength, origPaint);
+
+    // compute the glyph positions
+    SkAutoSTMalloc<32, SkPoint> pointStorage(glyphs.count);
+    SkAutoSTMalloc<32, SkScalar> glyphWidths(glyphs.count);
+    glyphs.paint.getTextWidths(glyphs.glyphIDs, glyphs.count << 1, glyphWidths.get());
+
+    // compute conservative bounds
+    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
+    //       but even more conservative bounds if this  is too slow.
+    SkRect bounds;
+    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
+
+    // adjust for non-left alignment
+    if (glyphs.paint.getTextAlign() != SkPaint::kLeft_Align) {
+        SkScalar stop = 0;
+        for (int i = 0; i < glyphs.count; i++) {
+            stop += glyphWidths[i];
+        }
+        if (glyphs.paint.getTextAlign() == SkPaint::kCenter_Align) {
+            stop = SkScalarHalf(stop);
+        }
+        if (glyphs.paint.isVerticalText()) {
+            y -= stop;
+        } else {
+            x -= stop;
+        }
+    }
+
+    // setup the first glyph position and adjust bounds if needed
+    if (mCanvas->drawTextAbsolutePos()) {
+        bounds.offset(x,y);
+        pointStorage[0].set(x, y);
+    } else {
+        pointStorage[0].set(0, 0);
+    }
+
+    // setup the remaining glyph positions
+    if (glyphs.paint.isVerticalText()) {
+        for (int i = 1; i < glyphs.count; i++) {
+            pointStorage[i].set(x, glyphWidths[i-1] + pointStorage[i-1].fY);
+        }
+    } else {
+        for (int i = 1; i < glyphs.count; i++) {
+            pointStorage[i].set(glyphWidths[i-1] + pointStorage[i-1].fX, y);
+        }
+    }
+
+    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
+    mCanvas->drawText(glyphs.glyphIDs, &pointStorage[0].fX, glyphs.count, glyphs.paint,
+                      x, y, bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
+}
+
+void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+        const SkPaint& origPaint) {
+    // convert to glyphIDs if necessary
+    GlyphIDConverter glyphs(text, byteLength, origPaint);
+
+    // convert to relative positions if necessary
+    int x, y;
+    const SkPoint* posArray;
+    SkAutoSTMalloc<32, SkPoint> pointStorage;
+    if (mCanvas->drawTextAbsolutePos()) {
+        x = 0;
+        y = 0;
+        posArray = pos;
+    } else {
+        x = pos[0].fX;
+        y = pos[0].fY;
+        posArray = pointStorage.reset(glyphs.count);
+        for (int i = 0; i < glyphs.count; i++) {
+            pointStorage[i].fX = pos[i].fX- x;
+            pointStorage[i].fY = pos[i].fY- y;
+        }
+    }
+
+    // compute conservative bounds
+    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
+    //       but even more conservative bounds if this  is too slow.
+    SkRect bounds;
+    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
+
+    SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats);
+    mCanvas->drawText(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,
+                      bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, 0);
+}
+
+void SkiaCanvasProxy::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+        SkScalar constY, const SkPaint& paint) {
+    const size_t pointCount = byteLength >> 1;
+    SkAutoSTMalloc<32, SkPoint> storage(pointCount);
+    SkPoint* pts = storage.get();
+    for (size_t i = 0; i < pointCount; i++) {
+        pts[i].set(xpos[i], constY);
+    }
+    this->onDrawPosText(text, byteLength, pts, paint);
+}
+
+void SkiaCanvasProxy::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+        const SkMatrix* matrix, const SkPaint& origPaint) {
+    // convert to glyphIDs if necessary
+    GlyphIDConverter glyphs(text, byteLength, origPaint);
+    mCanvas->drawTextOnPath(glyphs.glyphIDs, glyphs.count, path, 0, 0, glyphs.paint);
+}
+
+void SkiaCanvasProxy::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+        const SkPaint& paint) {
+    SkDEBUGFAIL("SkiaCanvasProxy::onDrawTextBlob is not supported");
+}
+
+void SkiaCanvasProxy::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+        const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
+    SkPatchUtils::VertexData data;
+
+    SkMatrix matrix;
+    mCanvas->getMatrix(&matrix);
+    SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);
+
+    // It automatically adjusts lodX and lodY in case it exceeds the number of indices.
+    // If it fails to generate the vertices, then we do not draw.
+    if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
+        this->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
+                           data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
+                           paint);
+    }
+}
+
+void SkiaCanvasProxy::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) {
+    mCanvas->clipRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, op);
+}
+
+void SkiaCanvasProxy::onClipRRect(const SkRRect& roundRect, SkRegion::Op op, ClipEdgeStyle) {
+    SkPath path;
+    path.addRRect(roundRect);
+    mCanvas->clipPath(&path, op);
+}
+
+void SkiaCanvasProxy::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) {
+    mCanvas->clipPath(&path, op);
+}
+
+void SkiaCanvasProxy::onClipRegion(const SkRegion& region, SkRegion::Op op) {
+    mCanvas->clipRegion(&region, op);
+}
+
+}; // namespace uirenderer
+}; // namespace android