Revert "Revert "switch GatherPixelRefs to use SkBaseDevice instead of SkBitmapDevice""

This reverts commit ff0152ec5e2a0faf38ae1a317c5d77df08139104.

BUG=

Review URL: https://codereview.chromium.org/68203018

git-svn-id: http://skia.googlecode.com/svn/trunk@12271 2bbb7eff-a529-9590-31e7-b0007b416f81

6 files changed, 72 insertions, 54 deletions

diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index 691202004e..83f480c60c 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -73,13 +73,6 @@ public:
     */
     virtual int height() const SK_OVERRIDE { return fBitmap.height(); }
 
-    /**
-     *  Return the bounds of the device in the coordinate space of the root
-     *  canvas. The root device will have its top-left at 0,0, but other devices
-     *  such as those associated with saveLayer may have a non-zero origin.
-     */
-    virtual void getGlobalBounds(SkIRect* bounds) const SK_OVERRIDE;
-
     /** Returns true if the device's bitmap's config treats every pixels as
         implicitly opaque.
     */
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 8dce0a49e5..b1f430ec77 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -83,7 +83,12 @@ public:
      *  canvas. The root device will have its top-left at 0,0, but other devices
      *  such as those associated with saveLayer may have a non-zero origin.
      */
-    virtual void getGlobalBounds(SkIRect* bounds) const = 0;
+    void getGlobalBounds(SkIRect* bounds) const {
+        SkASSERT(bounds);
+        const SkIPoint& origin = this->getOrigin();
+        bounds->setXYWH(origin.x(), origin.y(), this->width(), this->height());
+    }
+    
 
     /** Returns true if the device's bitmap's config treats every pixel as
         implicitly opaque.
@@ -383,6 +388,7 @@ private:
     // used to change the backend's pixels (and possibly config/rowbytes)
     // but cannot change the width/height, so there should be no change to
     // any clip information.
+    // TODO: move to SkBitmapDevice
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) = 0;
 
     // just called by SkCanvas when built as a layer
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index 29f59f28df..d37f63d7a0 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -72,7 +72,6 @@ public:
     virtual int height() const SK_OVERRIDE {
         return NULL == fRenderTarget ? 0 : fRenderTarget->height();
     }
-    virtual void getGlobalBounds(SkIRect* bounds) const SK_OVERRIDE;
     virtual bool isOpaque() const SK_OVERRIDE {
         return NULL == fRenderTarget ? false
                                      : kRGB_565_GrPixelConfig == fRenderTarget->config();
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 7731a920dc..369f10c1bf 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -77,14 +77,6 @@ void SkBitmapDevice::unlockPixels() {
     }
 }
 
-void SkBitmapDevice::getGlobalBounds(SkIRect* bounds) const {
-    if (NULL != bounds) {
-        const SkIPoint& origin = this->getOrigin();
-        bounds->setXYWH(origin.x(), origin.y(),
-                        fBitmap.width(), fBitmap.height());
-    }
-}
-
 void SkBitmapDevice::clear(SkColor color) {
     fBitmap.eraseColor(color);
 }
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 429ee9f8e2..747688ed8b 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -513,13 +513,6 @@ inline bool skPaint2GrPaintShader(SkGpuDevice* dev,
 }
 
 ///////////////////////////////////////////////////////////////////////////////
-void SkGpuDevice::getGlobalBounds(SkIRect* bounds) const {
-    if (NULL != bounds) {
-        const SkIPoint& origin = this->getOrigin();
-        bounds->setXYWH(origin.x(), origin.y(),
-                        this->width(), this->height());
-    }
-}
 
 SkBitmap::Config SkGpuDevice::config() const {
     if (NULL == fRenderTarget) {
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index ffd9aa4429..fa16af07f2 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -45,34 +45,38 @@ static void nothing_to_do() {}
 /**
  *  This device will route all bitmaps (primitives and in shaders) to its PRSet.
  *  It should never actually draw anything, so there need not be any pixels
- *  behind its device-bitmap.
- *  FIXME: Derive from SkBaseDevice.
+ *  behind its device.
  */
-class GatherPixelRefDevice : public SkBitmapDevice {
-private:
-    PixelRefSet*  fPRSet;
-
-    void addBitmap(const SkBitmap& bm) {
-        fPRSet->add(bm.pixelRef());
+class GatherPixelRefDevice : public SkBaseDevice {
+public:
+    GatherPixelRefDevice(int width, int height, PixelRefSet* prset) {
+        fSize.set(width, height);
+        fEmptyBitmap.setConfig(SkBitmap::kNo_Config, width, height);
+        fPRSet = prset;
     }
 
-    void addBitmapFromPaint(const SkPaint& paint) {
-        SkShader* shader = paint.getShader();
-        if (shader) {
-            SkBitmap bm;
-            // Check whether the shader is a gradient in order to short-circuit
-            // call to asABitmap to prevent generation of bitmaps from
-            // gradient shaders, which implement asABitmap.
-            if (SkShader::kNone_GradientType == shader->asAGradient(NULL) &&
-                shader->asABitmap(&bm, NULL, NULL)) {
-                fPRSet->add(bm.pixelRef());
-            }
-        }
+    virtual uint32_t getDeviceCapabilities() SK_OVERRIDE { return 0; }
+    virtual int width() const SK_OVERRIDE { return fSize.width(); }
+    virtual int height() const SK_OVERRIDE { return fSize.height(); }
+    virtual bool isOpaque() const SK_OVERRIDE { return false; }
+    virtual SkBitmap::Config config() const SK_OVERRIDE {
+        return SkBitmap::kNo_Config;
     }
-
-public:
-    GatherPixelRefDevice(const SkBitmap& bm, PixelRefSet* prset) : SkBitmapDevice(bm) {
-        fPRSet = prset;
+    virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
+    virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
+        return true;
+    }
+    // TODO: allow this call to return failure, or move to SkBitmapDevice only.
+    virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
+        return fEmptyBitmap;
+    }
+    virtual void lockPixels() SK_OVERRIDE { nothing_to_do(); }
+    virtual void unlockPixels() SK_OVERRIDE { nothing_to_do(); }
+    virtual bool allowImageFilter(SkImageFilter*) SK_OVERRIDE { return false; }
+    virtual bool canHandleImageFilter(SkImageFilter*) SK_OVERRIDE { return false; }
+    virtual bool filterImage(SkImageFilter*, const SkBitmap&, const SkMatrix&,
+                             SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
+        return false;
     }
 
     virtual void clear(SkColor color) SK_OVERRIDE {
@@ -156,8 +160,43 @@ protected:
         return false;
     }
 
+    virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
+        not_supported();
+    }
+    virtual SkBaseDevice* onCreateCompatibleDevice(SkBitmap::Config config,
+                                                   int width, int height,
+                                                   bool isOpaque,
+                                                   Usage usage) SK_OVERRIDE {
+        // we expect to only get called via savelayer, in which case it is fine.
+        SkASSERT(kSaveLayer_Usage == usage);
+        return SkNEW_ARGS(GatherPixelRefDevice, (width, height, fPRSet));
+    }
+    virtual void flush() SK_OVERRIDE {}
+
 private:
-    typedef SkBitmapDevice INHERITED;
+    PixelRefSet*  fPRSet;
+    SkBitmap fEmptyBitmap;  // legacy -- need to remove the need for this guy
+    SkISize fSize;
+
+    void addBitmap(const SkBitmap& bm) {
+      fPRSet->add(bm.pixelRef());
+    }
+
+    void addBitmapFromPaint(const SkPaint& paint) {
+      SkShader* shader = paint.getShader();
+      if (shader) {
+          SkBitmap bm;
+          // Check whether the shader is a gradient in order to short-circuit
+          // call to asABitmap to prevent generation of bitmaps from
+          // gradient shaders, which implement asABitmap.
+          if (SkShader::kNone_GradientType == shader->asAGradient(NULL) &&
+              shader->asABitmap(&bm, NULL, NULL)) {
+              fPRSet->add(bm.pixelRef());
+          }
+      }
+    }
+
+    typedef SkBaseDevice INHERITED;
 };
 
 class NoSaveLayerCanvas : public SkCanvas {
@@ -214,11 +253,7 @@ SkData* SkPictureUtils::GatherPixelRefs(SkPicture* pict, const SkRect& area) {
     SkTDArray<SkPixelRef*> array;
     PixelRefSet prset(&array);
 
-    SkBitmap emptyBitmap;
-    emptyBitmap.setConfig(SkBitmap::kARGB_8888_Config, pict->width(), pict->height());
-    // note: we do not set any pixels (shouldn't need to)
-
-    GatherPixelRefDevice device(emptyBitmap, &prset);
+    GatherPixelRefDevice device(pict->width(), pict->height(), &prset);
     NoSaveLayerCanvas canvas(&device);
 
     canvas.clipRect(area, SkRegion::kIntersect_Op, false);