Add utils/android/SkAndroidSDKCanvas

src/utils/android/SkAndroidSDKFilterCanvas.cpp

Index: src/utils/android/SkAndroidSDKFilterCanvas.cpp
diff --git a/src/utils/android/SkAndroidSDKFilterCanvas.cpp b/src/utils/android/SkAndroidSDKFilterCanvas.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4157a616bb8adc8b80dcfd269347015ed60c361a
--- /dev/null
+++ b/src/utils/android/SkAndroidSDKFilterCanvas.cpp
@@ -0,0 +1,316 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkAndroidSDKFilterCanvas.h"
+
+#include "SkColorFilter.h"
+#include "SkPathEffect.h"
+#include "SkShader.h"
+
+namespace {
+
+/** Discard SkShaders not exposed by the Android Java API. */
+
+void CheckShader(SkPaint* paint) {
+    SkShader* shader = paint->getShader();
+    if (!shader) {
+        return;
+    }
+
+    if (shader->asABitmap(NULL, NULL, NULL) == SkShader::kDefault_BitmapType) {
+        return;
+    }
+    if (shader->asACompose(NULL)) {
+        return;
+    }
+    SkShader::GradientType gtype = shader->asAGradient(NULL);
+    if (gtype == SkShader::kLinear_GradientType ||
+        gtype == SkShader::kRadial_GradientType ||
+        gtype == SkShader::kSweep_GradientType) {
+        return;
+    }
+    paint->setShader(NULL);
+}
+
+void Filter(SkPaint* paint) {
+
+    uint32_t flags = paint->getFlags();
+    flags &= ~SkPaint::kLCDRenderText_Flag;
+    paint->setFlags(flags);
+
+    // Android doesn't support Xfermodes above kLighten_Mode
+    SkXfermode::Mode mode;
+    SkXfermode::AsMode(paint->getXfermode(), &mode);
+    if (mode > SkXfermode::kLighten_Mode) {
+        paint->setXfermode(NULL);
+    }
+
+    // Force bilinear scaling or none
+    if (paint->getFilterQuality() != kNone_SkFilterQuality) {
+        paint->setFilterQuality(kLow_SkFilterQuality);
+    }
+
+    CheckShader(paint);
+
+    // Android SDK only supports mode & matrix color filters
+    // (and, again, no modes above kLighten_Mode).
+    SkColorFilter* cf = paint->getColorFilter();
+    if (cf) {
+        SkColor color;
+        SkXfermode::Mode mode;
+        SkScalar srcColorMatrix[20];
+        bool isMode = cf->asColorMode(&color, &mode);
+        if (isMode && mode > SkXfermode::kLighten_Mode) {
+            paint->setColorFilter(
+                SkColorFilter::CreateModeFilter(color, SkXfermode::kSrcOver_Mode));
+        } else if (!isMode && !cf->asColorMatrix(srcColorMatrix)) {
+            paint->setColorFilter(NULL);
+        }
+    }
+
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+    SkPathEffect* pe = paint->getPathEffect();
+    if (pe && !pe->exposedInAndroidJavaAPI()) {
+        paint->setPathEffect(NULL);
+    }
+#endif
+
+    // TODO: Android doesn't support all the flags that can be passed to
+    // blur filters; we need plumbing to get them out.
+
+    paint->setImageFilter(NULL);
+    paint->setLooper(NULL);
+};
+
+}  // namespace
+
+#define FILTER(p)             \
+    SkPaint filteredPaint(p); \
+    Filter(&filteredPaint);
+
+#define FILTER_PTR(p)                          \
+    SkTLazy<SkPaint> lazyPaint;                \
+    SkPaint* filteredPaint = (SkPaint*) p;     \
+    if (p) {                                   \
+        filteredPaint = lazyPaint.set(*p);     \
+        Filter(filteredPaint);                 \
+    }
+
+
+SkAndroidSDKFilterCanvas::SkAndroidSDKFilterCanvas() : fProxyTarget(NULL) { }
+
+void SkAndroidSDKFilterCanvas::reset(SkCanvas* newTarget) { fProxyTarget = newTarget; }
+
+void SkAndroidSDKFilterCanvas::onDrawPaint(const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPaint(filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawPoints(PointMode pMode,
+                                               size_t count,
+                                               const SkPoint pts[],
+                                               const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPoints(pMode, count, pts, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawOval(const SkRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawOval(r, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawRect(const SkRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawRect(r, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawRRect(const SkRRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawRRect(r, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPath(path, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawBitmap(const SkBitmap& bitmap,
+                                               SkScalar left,
+                                               SkScalar top,
+                                               const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawBitmap(bitmap, left, top, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawBitmapRect(const SkBitmap& bitmap,
+                                                   const SkRect* src,
+                                                   const SkRect& dst,
+                                                   const SkPaint* paint,
+                                                   DrawBitmapRectFlags flags) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawBitmapRectToRect(bitmap, src, dst, filteredPaint, flags);
+}
+void SkAndroidSDKFilterCanvas::onDrawBitmapNine(const SkBitmap& bitmap,
+                                                   const SkIRect& center,
+                                                   const SkRect& dst,
+                                                   const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawBitmapNine(bitmap, center, dst, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawSprite(const SkBitmap& bitmap,
+                                               int left,
+                                               int top,
+                                               const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawSprite(bitmap, left, top, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawVertices(VertexMode vMode,
+                                                 int vertexCount,
+                                                 const SkPoint vertices[],
+                    const SkPoint texs[], const SkColor colors[], SkXfermode* xMode,
+                    const uint16_t indices[], int indexCount,
+                    const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawVertices(vMode, vertexCount, vertices, texs, colors,
+                               xMode, indices, indexCount, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawDRRect(const SkRRect& outer,
+                                               const SkRRect& inner,
+                                               const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawDRRect(outer, inner, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawText(const void* text,
+                                             size_t byteLength,
+                                             SkScalar x,
+                                             SkScalar y,
+                                             const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawText(text, byteLength, x, y, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawPosText(const void* text,
+                                                size_t byteLength,
+                                                const SkPoint pos[],
+                                                const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPosText(text, byteLength, pos, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawPosTextH(const void* text,
+                                                 size_t byteLength,
+                                                 const SkScalar xpos[],
+                                                 SkScalar constY,
+                                                 const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPosTextH(text, byteLength, xpos, constY, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawTextOnPath(const void* text,
+                                                   size_t byteLength,
+                                                   const SkPath& path,
+                                                   const SkMatrix* matrix,
+                                                   const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawTextOnPath(text, byteLength, path, matrix, filteredPaint);
+}
+void SkAndroidSDKFilterCanvas::onDrawTextBlob(const SkTextBlob* blob,
+                                                 SkScalar x,
+                                                 SkScalar y,
+                                                 const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawTextBlob(blob, x, y, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawPatch(const SkPoint cubics[12],
+                                              const SkColor colors[4],
+                                              const SkPoint texCoords[4],
+                                              SkXfermode* xmode,
+                                              const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPatch(cubics, colors, texCoords, xmode, filteredPaint);
+}
+
+
+void SkAndroidSDKFilterCanvas::onDrawImage(const SkImage* image,
+                                              SkScalar x,
+                                              SkScalar y,
+                                              const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawImage(image, x, y, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawImageRect(const SkImage* image,
+                                                  const SkRect* in,
+                                                  const SkRect& out,
+                                                  const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawImageRect(image, in, out, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawPicture(const SkPicture* picture,
+                                                const SkMatrix* matrix,
+                                                const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawPicture(picture, matrix, filteredPaint);
+}
+
+void SkAndroidSDKFilterCanvas::onDrawDrawable(SkDrawable* drawable) {
+    fProxyTarget->drawDrawable(drawable);
+}
+
+SkISize SkAndroidSDKFilterCanvas::getBaseLayerSize() const {
+    return fProxyTarget->getBaseLayerSize();
+}
+bool SkAndroidSDKFilterCanvas::getClipBounds(SkRect* rect) const {
+    return fProxyTarget->getClipBounds(rect);
+}
+bool SkAndroidSDKFilterCanvas::getClipDeviceBounds(SkIRect* rect) const {
+    return fProxyTarget->getClipDeviceBounds(rect);
+}
+
+bool SkAndroidSDKFilterCanvas::isClipEmpty() const { return fProxyTarget->isClipEmpty(); }
+bool SkAndroidSDKFilterCanvas::isClipRect() const { return fProxyTarget->isClipRect(); }
+
+SkSurface* SkAndroidSDKFilterCanvas::onNewSurface(const SkImageInfo& info,
+                                                     const SkSurfaceProps& props) {
+    return fProxyTarget->newSurface(info, &props);
+}
+
+const void* SkAndroidSDKFilterCanvas::onPeekPixels(SkImageInfo* info, size_t* data) {
+    return fProxyTarget->peekPixels(info, data);
+}
+
+void* SkAndroidSDKFilterCanvas::onAccessTopLayerPixels(SkImageInfo* info, size_t* data) {
+    return fProxyTarget->accessTopLayerPixels(info, data);
+}
+
+void SkAndroidSDKFilterCanvas::willSave() { fProxyTarget->save(); }
+void SkAndroidSDKFilterCanvas::willRestore() { fProxyTarget->restore(); }
+void SkAndroidSDKFilterCanvas::didRestore() { }
+void SkAndroidSDKFilterCanvas::didConcat(const SkMatrix& m) {
+    fProxyTarget->concat(m);
+}
+void SkAndroidSDKFilterCanvas::didSetMatrix(const SkMatrix& m) { fProxyTarget->setMatrix(m); }
+
+void SkAndroidSDKFilterCanvas::onClipRect(const SkRect& rect,
+                                             SkRegion::Op op,
+                                             ClipEdgeStyle style) {
+    fProxyTarget->clipRect(rect, op, style);
+}
+
+void SkAndroidSDKFilterCanvas::onClipRRect(const SkRRect& rrect,
+                                              SkRegion::Op op,
+                                              ClipEdgeStyle style) {
+    fProxyTarget->clipRRect(rrect, op, style);
+}
+
+void SkAndroidSDKFilterCanvas::onClipPath(const SkPath& path,
+                                             SkRegion::Op op,
+                                             ClipEdgeStyle style) {
+    fProxyTarget->clipPath(path, op, style);
+}
+
+void SkAndroidSDKFilterCanvas::onClipRegion(const SkRegion& region, SkRegion::Op op) {
+    fProxyTarget->clipRegion(region, op);
+}
+
+void SkAndroidSDKFilterCanvas::onDiscard() { fProxyTarget->discard(); }
+
+