change gpudevice and pdfdevice to inherit from basedevice

BUG=skia:
R=robertphillips@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/354133002

8 files changed, 85 insertions, 138 deletions

diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index cc6d2adc6c..e1765e56ab 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -35,20 +35,7 @@ public:
 
     virtual SkImageInfo imageInfo() const SK_OVERRIDE;
 
-    /**
-     * Return the device's associated gpu render target, or NULL.
-     */
-    virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
-
 protected:
-    /**
-     *  Device may filter the text flags for drawing text here. If it wants to
-     *  make a change to the specified values, it should write them into the
-     *  textflags parameter (output) and return true. If the paint is fine as
-     *  is, then ignore the textflags parameter and return false.
-     *
-     *  The baseclass SkDevice filters based on its depth and blitters.
-     */
     virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE;
 
     /** Clears the entire device to the specified color (including alpha).
@@ -149,33 +136,6 @@ protected:
     virtual void lockPixels() SK_OVERRIDE;
     virtual void unlockPixels() SK_OVERRIDE;
 
-    /**
-     *  Returns true if the device allows processing of this imagefilter. If
-     *  false is returned, then the filter is ignored. This may happen for
-     *  some subclasses that do not support pixel manipulations after drawing
-     *  has occurred (e.g. printing). The default implementation returns true.
-     */
-    virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE;
-
-    /**
-     *  Override and return true for filters that the device can handle
-     *  intrinsically. Doing so means that SkCanvas will pass-through this
-     *  filter to drawSprite and drawDevice (and potentially filterImage).
-     *  Returning false means the SkCanvas will have apply the filter itself,
-     *  and just pass the resulting image to the device.
-     */
-    virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE;
-
-    /**
-     *  Related (but not required) to canHandleImageFilter, this method returns
-     *  true if the device could apply the filter to the src bitmap and return
-     *  the result (and updates offset as needed).
-     *  If the device does not recognize or support this filter,
-     *  it just returns false and leaves result and offset unchanged.
-     */
-    virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
-                             SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
-
 private:
     friend class SkCanvas;
     friend struct DeviceCM; //for setMatrixClip
@@ -193,10 +153,6 @@ private:
 
     virtual SkBaseDevice* onCreateDevice(const SkImageInfo&, Usage) SK_OVERRIDE;
 
-    /** Causes any deferred drawing to the device to be completed.
-     */
-    virtual void flush() SK_OVERRIDE {}
-
     virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
     virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
 
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 4b3db126f1..80bf24283d 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -104,7 +104,7 @@ public:
     /**
      * Return the device's associated gpu render target, or NULL.
      */
-    virtual GrRenderTarget* accessRenderTarget() = 0;
+    virtual GrRenderTarget* accessRenderTarget() { return NULL; }
 
 
     /**
@@ -157,10 +157,8 @@ protected:
      *  make a change to the specified values, it should write them into the
      *  textflags parameter (output) and return true. If the paint is fine as
      *  is, then ignore the textflags parameter and return false.
-     *
-     *  The baseclass SkBaseDevice filters based on its depth and blitters.
      */
-    virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) = 0;
+    virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) { return false; }
 
     /**
      *
@@ -273,8 +271,8 @@ protected:
     /** Called when this device is installed into a Canvas. Balanced by a call
         to unlockPixels() when the device is removed from a Canvas.
     */
-    virtual void lockPixels() = 0;
-    virtual void unlockPixels() = 0;
+    virtual void lockPixels() {}
+    virtual void unlockPixels() {}
 
     /**
      *  Returns true if the device allows processing of this imagefilter. If
@@ -282,7 +280,7 @@ protected:
      *  some subclasses that do not support pixel manipulations after drawing
      *  has occurred (e.g. printing). The default implementation returns true.
      */
-    virtual bool allowImageFilter(const SkImageFilter*) = 0;
+    virtual bool allowImageFilter(const SkImageFilter*) { return true; }
 
     /**
      *  Override and return true for filters that the device can handle
@@ -291,7 +289,7 @@ protected:
      *  Returning false means the SkCanvas will have apply the filter itself,
      *  and just pass the resulting image to the device.
      */
-    virtual bool canHandleImageFilter(const SkImageFilter*) = 0;
+    virtual bool canHandleImageFilter(const SkImageFilter*) { return false; }
 
     /**
      *  Related (but not required) to canHandleImageFilter, this method returns
@@ -302,7 +300,9 @@ protected:
      */
     virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
                              const SkImageFilter::Context& ctx,
-                             SkBitmap* result, SkIPoint* offset) = 0;
+                             SkBitmap* result, SkIPoint* offset) {
+        return false;
+    }
 
 protected:
     // default impl returns NULL
@@ -380,7 +380,7 @@ private:
     // 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;
+    virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) {}
 
     // just called by SkCanvas when built as a layer
     void setOrigin(int x, int y) { fOrigin.set(x, y); }
@@ -393,7 +393,7 @@ private:
 
     /** Causes any deferred drawing to the device to be completed.
      */
-    virtual void flush() = 0;
+    virtual void flush() {}
 
     SkIPoint    fOrigin;
     SkMetaData* fMetaData;
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index 0b6bbc1857..6451e15c9b 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -13,7 +13,7 @@
 
 #include "SkGr.h"
 #include "SkBitmap.h"
-#include "SkBitmapDevice.h"
+#include "SkDevice.h"
 #include "SkPicture.h"
 #include "SkRegion.h"
 #include "GrContext.h"
@@ -24,10 +24,10 @@ struct GrSkDrawProcs;
 class GrTextContext;
 
 /**
- *  Subclass of SkBitmapDevice, which directs all drawing to the GrGpu owned by the
+ *  Subclass of SkBaseDevice, which directs all drawing to the GrGpu owned by the
  *  canvas.
  */
-class SK_API SkGpuDevice : public SkBitmapDevice {
+class SK_API SkGpuDevice : public SkBaseDevice {
 public:
     enum Flags {
         kNeedClear_Flag = 1 << 0,  //!< Surface requires an initial clear
@@ -161,6 +161,9 @@ private:
     GrRenderTarget*     fRenderTarget;
     bool                fNeedClear;
 
+    // remove when our clients don't rely on accessBitmap()
+    SkBitmap fLegacyBitmap;
+
     // called from rt and tex cons
     void initFromRenderTarget(GrContext*, GrRenderTarget*, unsigned flags);
 
@@ -214,7 +217,7 @@ private:
 
     static SkPicture::AccelData::Key ComputeAccelDataKey();
 
-    typedef SkBitmapDevice INHERITED;
+    typedef SkBaseDevice INHERITED;
 };
 
 #endif
diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index e250a6de4f..bcdcfb24e4 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -10,7 +10,7 @@
 #ifndef SkPDFDevice_DEFINED
 #define SkPDFDevice_DEFINED
 
-#include "SkBitmapDevice.h"
+#include "SkDevice.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
@@ -45,7 +45,7 @@ struct NamedDestination;
 
     The drawing context for the PDF backend.
 */
-class SkPDFDevice : public SkBitmapDevice {
+class SkPDFDevice : public SkBaseDevice {
 public:
     /** Create a PDF drawing context with the given width and height.
      *  72 points/in means letter paper is 612x792.
@@ -82,8 +82,8 @@ public:
                             size_t count, const SkPoint[],
                             const SkPaint& paint) SK_OVERRIDE;
     virtual void drawRect(const SkDraw&, const SkRect& r, const SkPaint& paint);
-    virtual void drawRRect(const SkDraw&, const SkRRect& rr,
-                           const SkPaint& paint) SK_OVERRIDE;
+    virtual void drawOval(const SkDraw&, const SkRect& oval, const SkPaint& paint) SK_OVERRIDE;
+    virtual void drawRRect(const SkDraw&, const SkRRect& rr, const SkPaint& paint) SK_OVERRIDE;
     virtual void drawPath(const SkDraw&, const SkPath& origpath,
                           const SkPaint& paint, const SkMatrix* prePathMatrix,
                           bool pathIsMutable) SK_OVERRIDE;
@@ -113,6 +113,7 @@ public:
 
     virtual void onAttachToCanvas(SkCanvas* canvas) SK_OVERRIDE;
     virtual void onDetachFromCanvas() SK_OVERRIDE;
+    virtual SkImageInfo imageInfo() const SK_OVERRIDE;    
 
     enum DrawingArea {
         kContent_DrawingArea,  // Drawing area for the page content.
@@ -208,7 +209,15 @@ public:
     }
 
 protected:
-    virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE;
+    virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
+        return fLegacyBitmap;
+    }
+
+    virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE {
+        return false;
+    }
+
+    virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
 
 private:
     // TODO(vandebo): push most of SkPDFDevice's state into a core object in
@@ -248,6 +257,8 @@ private:
     SkPicture::EncodeBitmap fEncoder;
     SkScalar fRasterDpi;
 
+    SkBitmap fLegacyBitmap;
+
     SkPDFDevice(const SkISize& layerSize, const SkClipStack& existingClipStack,
                 const SkRegion& existingClipRegion);
 
@@ -323,7 +334,7 @@ private:
     void defineNamedDestination(SkData* nameData, const SkPoint& point,
                                 const SkMatrix& matrix);
 
-    typedef SkBitmapDevice INHERITED;
+    typedef SkBaseDevice INHERITED;
 
     // TODO(edisonn): Only SkDocument_PDF and SkPDFImageShader should be able to create
     // an SkPDFDevice
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 0f3cc2be50..86c5702f03 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -132,20 +132,6 @@ const SkBitmap& SkBitmapDevice::onAccessBitmap() {
     return fBitmap;
 }
 
-bool SkBitmapDevice::canHandleImageFilter(const SkImageFilter*) {
-    return false;
-}
-
-bool SkBitmapDevice::filterImage(const SkImageFilter* filter, const SkBitmap& src,
-                                 const SkImageFilter::Context& ctx, SkBitmap* result,
-                                 SkIPoint* offset) {
-    return false;
-}
-
-bool SkBitmapDevice::allowImageFilter(const SkImageFilter*) {
-    return true;
-}
-
 void* SkBitmapDevice::onAccessPixels(SkImageInfo* info, size_t* rowBytes) {
     if (fBitmap.getPixels()) {
         *info = fBitmap.info();
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index d34170cba1..3b82a33c9c 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -127,16 +127,6 @@ public:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-/*
- * GrRenderTarget does not know its opaqueness, only its config, so we have
- * to make conservative guesses when we return an "equivalent" bitmap.
- */
-static SkBitmap make_bitmap(GrContext* context, GrRenderTarget* renderTarget) {
-    SkBitmap bitmap;
-    bitmap.setInfo(renderTarget->info());
-    return bitmap;
-}
-
 SkGpuDevice* SkGpuDevice::Create(GrSurface* surface, unsigned flags) {
     SkASSERT(NULL != surface);
     if (NULL == surface->asRenderTarget() || NULL == surface->getContext()) {
@@ -149,13 +139,11 @@ SkGpuDevice* SkGpuDevice::Create(GrSurface* surface, unsigned flags) {
     }
 }
 
-SkGpuDevice::SkGpuDevice(GrContext* context, GrTexture* texture, unsigned flags)
-    : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
+SkGpuDevice::SkGpuDevice(GrContext* context, GrTexture* texture, unsigned flags) {
     this->initFromRenderTarget(context, texture->asRenderTarget(), flags);
 }
 
-SkGpuDevice::SkGpuDevice(GrContext* context, GrRenderTarget* renderTarget, unsigned flags)
-    : SkBitmapDevice(make_bitmap(context, renderTarget)) {
+SkGpuDevice::SkGpuDevice(GrContext* context, GrRenderTarget* renderTarget, unsigned flags) {
     this->initFromRenderTarget(context, renderTarget, flags);
 }
 
@@ -185,8 +173,8 @@ void SkGpuDevice::initFromRenderTarget(GrContext* context,
 
     SkPixelRef* pr = SkNEW_ARGS(SkGrPixelRef,
                                 (surface->info(), surface, SkToBool(flags & kCached_Flag)));
-
-    this->setPixelRef(pr)->unref();
+    fLegacyBitmap.setInfo(surface->info());
+    fLegacyBitmap.setPixelRef(pr)->unref();
 
     bool useDFFonts = !!(flags & kDFFonts_Flag);
     fMainTextContext = fContext->createTextContext(fRenderTarget, fLeakyProperties, useDFFonts);
@@ -290,14 +278,14 @@ bool SkGpuDevice::onWritePixels(const SkImageInfo& info, const void* pixels, siz
     fRenderTarget->writePixels(x, y, info.width(), info.height(), config, pixels, rowBytes, flags);
 
     // need to bump our genID for compatibility with clients that "know" we have a bitmap
-    this->onAccessBitmap().notifyPixelsChanged();
+    fLegacyBitmap.notifyPixelsChanged();
 
     return true;
 }
 
 const SkBitmap& SkGpuDevice::onAccessBitmap() {
     DO_DEFERRED_CLEAR();
-    return INHERITED::onAccessBitmap();
+    return fLegacyBitmap;
 }
 
 void SkGpuDevice::onAttachToCanvas(SkCanvas* canvas) {
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index ab4d71d37f..e571477e43 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -29,6 +29,7 @@
 #include "SkRect.h"
 #include "SkRRect.h"
 #include "SkString.h"
+#include "SkSurface.h"
 #include "SkTextFormatParams.h"
 #include "SkTemplates.h"
 #include "SkTypefacePriv.h"
@@ -702,8 +703,8 @@ private:
 
 ////////////////////////////////////////////////////////////////////////////////
 
-static inline SkBitmap makeContentBitmap(const SkISize& contentSize,
-                                         const SkMatrix* initialTransform) {
+static inline SkImageInfo make_content_info(const SkISize& contentSize,
+                                            const SkMatrix* initialTransform) {
     SkImageInfo info;
     if (initialTransform) {
         // Compute the size of the drawing area.
@@ -723,24 +724,22 @@ static inline SkBitmap makeContentBitmap(const SkISize& contentSize,
         info = SkImageInfo::MakeUnknown(abs(contentSize.fWidth),
                                         abs(contentSize.fHeight));
     }
-
-    SkBitmap bitmap;
-    bitmap.setInfo(info);
-    return bitmap;
+    return info;
 }
 
 // TODO(vandebo) change pageSize to SkSize.
-// TODO: inherit from SkBaseDevice instead of SkBitmapDevice
 SkPDFDevice::SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize,
                          const SkMatrix& initialTransform)
-    : SkBitmapDevice(makeContentBitmap(contentSize, &initialTransform)),
-      fPageSize(pageSize),
-      fContentSize(contentSize),
-      fLastContentEntry(NULL),
-      fLastMarginContentEntry(NULL),
-      fClipStack(NULL),
-      fEncoder(NULL),
-      fRasterDpi(72.0f) {
+    : fPageSize(pageSize)
+    , fContentSize(contentSize)
+    , fLastContentEntry(NULL)
+    , fLastMarginContentEntry(NULL)
+    , fClipStack(NULL)
+    , fEncoder(NULL)
+    , fRasterDpi(72.0f)
+{
+    const SkImageInfo info = make_content_info(contentSize, &initialTransform);
+
     // Just report that PDF does not supports perspective in the
     // initial transform.
     NOT_IMPLEMENTED(initialTransform.hasPerspective(), true);
@@ -751,10 +750,10 @@ SkPDFDevice::SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize,
     fInitialTransform.setTranslate(0, SkIntToScalar(pageSize.fHeight));
     fInitialTransform.preScale(SK_Scalar1, -SK_Scalar1);
     fInitialTransform.preConcat(initialTransform);
+    fLegacyBitmap.setInfo(info);
 
-    SkIRect existingClip = SkIRect::MakeWH(this->width(), this->height());
+    SkIRect existingClip = SkIRect::MakeWH(info.width(), info.height());
     fExistingClipRegion.setRect(existingClip);
-
     this->init();
 }
 
@@ -762,17 +761,19 @@ SkPDFDevice::SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize,
 SkPDFDevice::SkPDFDevice(const SkISize& layerSize,
                          const SkClipStack& existingClipStack,
                          const SkRegion& existingClipRegion)
-    : SkBitmapDevice(makeContentBitmap(layerSize, NULL)),
-      fPageSize(layerSize),
-      fContentSize(layerSize),
-      fExistingClipStack(existingClipStack),
-      fExistingClipRegion(existingClipRegion),
-      fLastContentEntry(NULL),
-      fLastMarginContentEntry(NULL),
-      fClipStack(NULL),
-      fEncoder(NULL),
-      fRasterDpi(72.0f) {
+    : fPageSize(layerSize)
+    , fContentSize(layerSize)
+    , fExistingClipStack(existingClipStack)
+    , fExistingClipRegion(existingClipRegion)
+    , fLastContentEntry(NULL)
+    , fLastMarginContentEntry(NULL)
+    , fClipStack(NULL)
+    , fEncoder(NULL)
+    , fRasterDpi(72.0f)
+{
     fInitialTransform.reset();
+    fLegacyBitmap.setInfo(make_content_info(layerSize, NULL));
+
     this->init();
 }
 
@@ -961,13 +962,18 @@ void SkPDFDevice::drawRect(const SkDraw& d, const SkRect& rect,
                           &content.entry()->fContent);
 }
 
-void SkPDFDevice::drawRRect(const SkDraw& draw, const SkRRect& rrect,
-                            const SkPaint& paint) {
+void SkPDFDevice::drawRRect(const SkDraw& draw, const SkRRect& rrect, const SkPaint& paint) {
     SkPath  path;
     path.addRRect(rrect);
     this->drawPath(draw, path, paint, NULL, true);
 }
 
+void SkPDFDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint& paint) {
+    SkPath  path;
+    path.addOval(oval);
+    this->drawPath(draw, path, paint, NULL, true);
+}
+
 void SkPDFDevice::drawPath(const SkDraw& d, const SkPath& origPath,
                            const SkPaint& paint, const SkMatrix* prePathMatrix,
                            bool pathIsMutable) {
@@ -1364,6 +1370,10 @@ void SkPDFDevice::drawDevice(const SkDraw& d, SkBaseDevice* device,
     fFontGlyphUsage->merge(pdfDevice->getFontGlyphUsage());
 }
 
+SkImageInfo SkPDFDevice::imageInfo() const {
+    return fLegacyBitmap.info();
+}
+
 void SkPDFDevice::onAttachToCanvas(SkCanvas* canvas) {
     INHERITED::onAttachToCanvas(canvas);
 
@@ -1377,6 +1387,10 @@ void SkPDFDevice::onDetachFromCanvas() {
     fClipStack = NULL;
 }
 
+SkSurface* SkPDFDevice::newSurface(const SkImageInfo& info) {
+    return SkSurface::NewRaster(info);
+}
+
 ContentEntry* SkPDFDevice::getLastContentEntry() {
     if (fDrawingArea == kContent_DrawingArea) {
         return fLastContentEntry;
@@ -2237,8 +2251,7 @@ void SkPDFDevice::internalDrawBitmap(const SkMatrix& origMatrix,
         }
         perspectiveBitmap.eraseColor(SK_ColorTRANSPARENT);
 
-        SkBitmapDevice device(perspectiveBitmap);
-        SkCanvas canvas(&device);
+        SkCanvas canvas(perspectiveBitmap);
 
         SkScalar deltaX = bounds.left();
         SkScalar deltaY = bounds.top();
@@ -2305,6 +2318,3 @@ void SkPDFDevice::internalDrawBitmap(const SkMatrix& origMatrix,
                                 &content.entry()->fContent);
 }
 
-bool SkPDFDevice::allowImageFilter(const SkImageFilter*) {
-    return false;
-}
diff --git a/src/utils/SkGatherPixelRefsAndRects.h b/src/utils/SkGatherPixelRefsAndRects.h
index df3651e2e5..5d980aaf5f 100644
--- a/src/utils/SkGatherPixelRefsAndRects.h
+++ b/src/utils/SkGatherPixelRefsAndRects.h
@@ -39,12 +39,7 @@ public:
         return fEmptyBitmap.info();
     }
 
-    virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
-
 protected:
-    virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
-        return false;
-    }
     virtual void clear(SkColor color) SK_OVERRIDE {
         NothingToDo();
     }
@@ -319,8 +314,6 @@ private:
                           (info.width(), info.height(), fPRCont));
     }
 
-    virtual void flush() SK_OVERRIDE {}
-
     static void NotSupported() {
         SkDEBUGFAIL("this method should never be called");
     }