Both DM and nanobench need this, so moving the duplicated code to

one common spot. (It's incomplete, and has had bugs, so it's not
like we can confidently write once, copy-paste, and not maintain
again.)

Because SkPathEffect::exposedInAndroidJavaAPI() only builds in the
Android Framework, we might want to make all this code Framework-only?

R=djsollen@google.com,mtklein@google.com

Review URL: https://codereview.chromium.org/1021823003

2 files changed, 422 insertions, 0 deletions

diff --git a/src/utils/android/SkAndroidSDKCanvas.cpp b/src/utils/android/SkAndroidSDKCanvas.cpp
new file mode 100644
index 0000000000..d02fd72620
--- /dev/null
+++ b/src/utils/android/SkAndroidSDKCanvas.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 "SkAndroidSDKCanvas.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);                 \
+    }
+
+
+SkAndroidSDKCanvas::SkAndroidSDKCanvas() : fProxyTarget(NULL) { }
+
+void SkAndroidSDKCanvas::reset(SkCanvas* newTarget) { fProxyTarget = newTarget; }
+
+void SkAndroidSDKCanvas::onDrawPaint(const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPaint(filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawPoints(PointMode pMode,
+                                               size_t count,
+                                               const SkPoint pts[],
+                                               const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPoints(pMode, count, pts, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawOval(const SkRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawOval(r, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawRect(const SkRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawRect(r, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawRRect(const SkRRect& r, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawRRect(r, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPath(path, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawBitmap(const SkBitmap& bitmap,
+                                               SkScalar left,
+                                               SkScalar top,
+                                               const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawBitmap(bitmap, left, top, filteredPaint);
+}
+void SkAndroidSDKCanvas::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 SkAndroidSDKCanvas::onDrawBitmapNine(const SkBitmap& bitmap,
+                                                   const SkIRect& center,
+                                                   const SkRect& dst,
+                                                   const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawBitmapNine(bitmap, center, dst, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawSprite(const SkBitmap& bitmap,
+                                               int left,
+                                               int top,
+                                               const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawSprite(bitmap, left, top, filteredPaint);
+}
+void SkAndroidSDKCanvas::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 SkAndroidSDKCanvas::onDrawDRRect(const SkRRect& outer,
+                                               const SkRRect& inner,
+                                               const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawDRRect(outer, inner, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawText(const void* text,
+                                             size_t byteLength,
+                                             SkScalar x,
+                                             SkScalar y,
+                                             const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawText(text, byteLength, x, y, filteredPaint);
+}
+void SkAndroidSDKCanvas::onDrawPosText(const void* text,
+                                                size_t byteLength,
+                                                const SkPoint pos[],
+                                                const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawPosText(text, byteLength, pos, filteredPaint);
+}
+void SkAndroidSDKCanvas::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 SkAndroidSDKCanvas::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 SkAndroidSDKCanvas::onDrawTextBlob(const SkTextBlob* blob,
+                                                 SkScalar x,
+                                                 SkScalar y,
+                                                 const SkPaint& paint) {
+    FILTER(paint);
+    fProxyTarget->drawTextBlob(blob, x, y, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::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 SkAndroidSDKCanvas::onDrawImage(const SkImage* image,
+                                              SkScalar x,
+                                              SkScalar y,
+                                              const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawImage(image, x, y, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawImageRect(const SkImage* image,
+                                                  const SkRect* in,
+                                                  const SkRect& out,
+                                                  const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawImageRect(image, in, out, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawPicture(const SkPicture* picture,
+                                                const SkMatrix* matrix,
+                                                const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawPicture(picture, matrix, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawDrawable(SkDrawable* drawable) {
+    fProxyTarget->drawDrawable(drawable);
+}
+
+SkISize SkAndroidSDKCanvas::getBaseLayerSize() const {
+    return fProxyTarget->getBaseLayerSize();
+}
+bool SkAndroidSDKCanvas::getClipBounds(SkRect* rect) const {
+    return fProxyTarget->getClipBounds(rect);
+}
+bool SkAndroidSDKCanvas::getClipDeviceBounds(SkIRect* rect) const {
+    return fProxyTarget->getClipDeviceBounds(rect);
+}
+
+bool SkAndroidSDKCanvas::isClipEmpty() const { return fProxyTarget->isClipEmpty(); }
+bool SkAndroidSDKCanvas::isClipRect() const { return fProxyTarget->isClipRect(); }
+
+SkSurface* SkAndroidSDKCanvas::onNewSurface(const SkImageInfo& info,
+                                                     const SkSurfaceProps& props) {
+    return fProxyTarget->newSurface(info, &props);
+}
+
+const void* SkAndroidSDKCanvas::onPeekPixels(SkImageInfo* info, size_t* data) {
+    return fProxyTarget->peekPixels(info, data);
+}
+
+void* SkAndroidSDKCanvas::onAccessTopLayerPixels(SkImageInfo* info, size_t* data) {
+    return fProxyTarget->accessTopLayerPixels(info, data);
+}
+
+void SkAndroidSDKCanvas::willSave() { fProxyTarget->save(); }
+void SkAndroidSDKCanvas::willRestore() { fProxyTarget->restore(); }
+void SkAndroidSDKCanvas::didRestore() { }
+void SkAndroidSDKCanvas::didConcat(const SkMatrix& m) {
+    fProxyTarget->concat(m);
+}
+void SkAndroidSDKCanvas::didSetMatrix(const SkMatrix& m) { fProxyTarget->setMatrix(m); }
+
+void SkAndroidSDKCanvas::onClipRect(const SkRect& rect,
+                                             SkRegion::Op op,
+                                             ClipEdgeStyle style) {
+    fProxyTarget->clipRect(rect, op, style);
+}
+
+void SkAndroidSDKCanvas::onClipRRect(const SkRRect& rrect,
+                                              SkRegion::Op op,
+                                              ClipEdgeStyle style) {
+    fProxyTarget->clipRRect(rrect, op, style);
+}
+
+void SkAndroidSDKCanvas::onClipPath(const SkPath& path,
+                                             SkRegion::Op op,
+                                             ClipEdgeStyle style) {
+    fProxyTarget->clipPath(path, op, style);
+}
+
+void SkAndroidSDKCanvas::onClipRegion(const SkRegion& region, SkRegion::Op op) {
+    fProxyTarget->clipRegion(region, op);
+}
+
+void SkAndroidSDKCanvas::onDiscard() { fProxyTarget->discard(); }
+
+
diff --git a/src/utils/android/SkAndroidSDKCanvas.h b/src/utils/android/SkAndroidSDKCanvas.h
new file mode 100644
index 0000000000..fc046189f7
--- /dev/null
+++ b/src/utils/android/SkAndroidSDKCanvas.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkAndroidSDKCanvas_DEFINED
+#define SkAndroidSDKCanvas_DEFINED
+
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRect.h"
+
+/** SkDrawFilter is likely to be deprecated; this is a proxy
+    canvas that does the same thing: alter SkPaint fields.
+
+    onDraw*() functions may have their SkPaint modified, and are then
+    passed on to the same function on proxyTarget. THIS BREAKS CONSTNESS!
+
+    This still suffers one of the same architectural flaws as SkDrawFilter:
+    TextBlob paints are incomplete when filter is called.
+*/
+
+class SkAndroidSDKCanvas : public SkCanvas {
+public:
+    SkAndroidSDKCanvas();
+    void reset(SkCanvas* newTarget);
+
+protected:
+
+    // FILTERING
+
+    void onDrawPaint(const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPoints(PointMode pMode, size_t count, const SkPoint pts[],
+                      const SkPaint& paint) SK_OVERRIDE;
+    void onDrawOval(const SkRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawRect(const SkRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawRRect(const SkRRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPath(const SkPath& path, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
+                      const SkPaint* paint) SK_OVERRIDE;
+    void onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                          const SkPaint* paint, DrawBitmapRectFlags flags) SK_OVERRIDE;
+    void onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
+                          const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
+    void onDrawSprite(const SkBitmap& bitmap, int left, int top,
+                      const SkPaint* paint) SK_OVERRIDE;
+    void 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) SK_OVERRIDE;
+
+    void onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                      const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+                    const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+                       const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+                        SkScalar constY, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+                          const SkMatrix* matrix, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+                        const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+                     const SkPoint texCoords[4], SkXfermode* xmode,
+                     const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*)
+        SK_OVERRIDE;
+    void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*);
+
+    // PASS THROUGH
+
+    void onDrawDrawable(SkDrawable*) SK_OVERRIDE;
+    SkISize getBaseLayerSize() const SK_OVERRIDE;
+    bool getClipBounds(SkRect*) const SK_OVERRIDE;
+    bool getClipDeviceBounds(SkIRect*) const SK_OVERRIDE;
+    bool isClipEmpty() const SK_OVERRIDE;
+    bool isClipRect() const SK_OVERRIDE;
+    SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) SK_OVERRIDE;
+    const void* onPeekPixels(SkImageInfo*, size_t*) SK_OVERRIDE;
+    void* onAccessTopLayerPixels(SkImageInfo*, size_t*) SK_OVERRIDE;
+    void willSave() SK_OVERRIDE;
+    void willRestore() SK_OVERRIDE;
+    void didRestore() SK_OVERRIDE;
+    void didConcat(const SkMatrix&) SK_OVERRIDE;
+    void didSetMatrix(const SkMatrix&) SK_OVERRIDE;
+    void onClipRect(const SkRect&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipRRect(const SkRRect&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipPath(const SkPath&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipRegion(const SkRegion&, SkRegion::Op) SK_OVERRIDE;
+    void onDiscard() SK_OVERRIDE;
+
+protected:
+    SkCanvas* fProxyTarget;
+};
+
+#endif  // SkAndroidSDKCanvas_DEFINED
+