Move SkAndroidSDKCanvas to tools and ensure that it is built on all Android builds

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1536013003

Review URL: https://codereview.chromium.org/1536013003

2 files changed, 475 insertions, 0 deletions

diff --git a/tools/android/SkAndroidSDKCanvas.cpp b/tools/android/SkAndroidSDKCanvas.cpp
new file mode 100644
index 0000000000..45fcc758f2
--- /dev/null
+++ b/tools/android/SkAndroidSDKCanvas.cpp
@@ -0,0 +1,365 @@
+/*
+ * 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 "SkPaint.h"
+#include "SkPathEffect.h"
+#include "SkShader.h"
+#include "SkTLazy.h"
+
+namespace {
+
+/** Discard SkShaders not exposed by the Android Java API. */
+
+void CheckShader(SkPaint* paint) {
+    SkShader* shader = paint->getShader();
+    if (!shader) {
+        return;
+    }
+
+    if (shader->isABitmap()) {
+        return;
+    }
+    if (shader->asACompose(nullptr)) {
+        return;
+    }
+    SkShader::GradientType gtype = shader->asAGradient(nullptr);
+    if (gtype == SkShader::kLinear_GradientType ||
+        gtype == SkShader::kRadial_GradientType ||
+        gtype == SkShader::kSweep_GradientType) {
+        return;
+    }
+    paint->setShader(nullptr);
+}
+
+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(nullptr);
+    }
+
+    // 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(nullptr);
+        }
+    }
+
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+    SkPathEffect* pe = paint->getPathEffect();
+    if (pe && !pe->exposedInAndroidJavaAPI()) {
+        paint->setPathEffect(nullptr);
+    }
+#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(nullptr);
+    paint->setLooper(nullptr);
+};
+
+}  // 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(nullptr) { }
+
+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,
+                                                   SkCanvas::SrcRectConstraint constraint) {
+    FILTER_PTR(paint);
+    fProxyTarget->legacy_drawBitmapRect(bitmap, src, dst, filteredPaint, constraint);
+}
+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::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,
+                                         SrcRectConstraint constraint) {
+    FILTER_PTR(paint);
+    fProxyTarget->legacy_drawImageRect(image, in, out, filteredPaint, constraint);
+}
+
+void SkAndroidSDKCanvas::onDrawPicture(const SkPicture* picture,
+                                       const SkMatrix* matrix,
+                                       const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawPicture(picture, matrix, filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawAtlas(const SkImage* atlas,
+                                     const SkRSXform xform[],
+                                     const SkRect tex[],
+                                     const SkColor colors[],
+                                     int count,
+                                     SkXfermode::Mode mode,
+                                     const SkRect* cullRect,
+                                     const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawAtlas(atlas, xform, tex, colors, count, mode, cullRect,
+                            filteredPaint);
+}
+
+void SkAndroidSDKCanvas::onDrawImageNine(const SkImage* image,
+                                         const SkIRect& center,
+                                         const SkRect& dst,
+                                         const SkPaint* paint) {
+    FILTER_PTR(paint);
+    fProxyTarget->drawImageNine(image, center, dst, filteredPaint);
+}
+
+
+void SkAndroidSDKCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
+    fProxyTarget->drawDrawable(drawable, matrix);
+}
+
+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);
+}
+
+bool SkAndroidSDKCanvas::onPeekPixels(SkPixmap* pmap) {
+    SkASSERT(pmap);
+    SkImageInfo info;
+    size_t rowBytes;
+    const void* addr = fProxyTarget->peekPixels(&info, &rowBytes);
+    if (addr) {
+        pmap->reset(info, addr, rowBytes);
+        return true;
+    }
+    return false;
+}
+
+bool SkAndroidSDKCanvas::onAccessTopLayerPixels(SkPixmap* pmap) {
+    SkASSERT(pmap);
+    SkImageInfo info;
+    size_t rowBytes; 
+    const void* addr = fProxyTarget->accessTopLayerPixels(&info, &rowBytes, nullptr);
+    if (addr) {
+        pmap->reset(info, addr, rowBytes);
+        return true;
+    }
+    return false;
+}
+
+void SkAndroidSDKCanvas::willSave() {
+    fProxyTarget->save();
+}
+
+SkCanvas::SaveLayerStrategy SkAndroidSDKCanvas::getSaveLayerStrategy(const SaveLayerRec& rec) {
+    fProxyTarget->saveLayer(rec);
+    return SkCanvas::kNoLayer_SaveLayerStrategy;
+}
+
+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/tools/android/SkAndroidSDKCanvas.h b/tools/android/SkAndroidSDKCanvas.h
new file mode 100644
index 0000000000..d8ee0ed216
--- /dev/null
+++ b/tools/android/SkAndroidSDKCanvas.h
@@ -0,0 +1,110 @@
+/*
+ * 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) override;
+    void onDrawPoints(PointMode pMode, size_t count, const SkPoint pts[],
+                      const SkPaint& paint) override;
+    void onDrawOval(const SkRect& r, const SkPaint& paint) override;
+    void onDrawRect(const SkRect& r, const SkPaint& paint) override;
+    void onDrawRRect(const SkRRect& r, const SkPaint& paint) override;
+    void onDrawPath(const SkPath& path, const SkPaint& paint) override;
+    void onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
+                      const SkPaint* paint) override;
+    void onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                          const SkPaint* paint, SkCanvas::SrcRectConstraint) override;
+    void onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
+                          const SkRect& dst, const SkPaint* paint) 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) override;
+
+    void onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                      const SkPaint& paint) override;
+
+    void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+                    const SkPaint& paint) override;
+    void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+                       const SkPaint& paint) override;
+    void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+                        SkScalar constY, const SkPaint& paint) override;
+    void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+                          const SkMatrix* matrix, const SkPaint& paint) override;
+    void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+                        const SkPaint& paint) override;
+
+    void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+                     const SkPoint texCoords[4], SkXfermode* xmode,
+                     const SkPaint& paint) override;
+
+    void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) override;
+    void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*,
+                         SrcRectConstraint) override;
+    void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*);
+    void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[],
+                     const SkColor[], int count, SkXfermode::Mode,
+                     const SkRect* cull, const SkPaint*) override;
+    void onDrawImageNine(const SkImage*, const SkIRect& center,
+                         const SkRect& dst, const SkPaint*) override;
+
+    // PASS THROUGH
+
+    void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
+    SkISize getBaseLayerSize() const override;
+    bool getClipBounds(SkRect*) const override;
+    bool getClipDeviceBounds(SkIRect*) const override;
+    bool isClipEmpty() const override;
+    bool isClipRect() const override;
+    SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
+    bool onPeekPixels(SkPixmap*) override;
+    bool onAccessTopLayerPixels(SkPixmap*) override;
+    void willSave() override;
+    SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec&) override;
+    void willRestore() override;
+    void didRestore() override;
+    void didConcat(const SkMatrix&) override;
+    void didSetMatrix(const SkMatrix&) override;
+    void onClipRect(const SkRect&, SkRegion::Op, ClipEdgeStyle) override;
+    void onClipRRect(const SkRRect&, SkRegion::Op, ClipEdgeStyle) override;
+    void onClipPath(const SkPath&, SkRegion::Op, ClipEdgeStyle) override;
+    void onClipRegion(const SkRegion&, SkRegion::Op) override;
+    void onDiscard() override;
+
+protected:
+    SkCanvas* fProxyTarget;
+};
+
+#endif  // SkAndroidSDKCanvas_DEFINED
+