Add SkImage->draw() call with src and dst rects.

R=junov@chromium.org, senorblanco@chromium.org, reed@google.com

Author: arbesfeld@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19729007

git-svn-id: http://skia.googlecode.com/svn/trunk@10237 2bbb7eff-a529-9590-31e7-b0007b416f81

8 files changed, 69 insertions, 0 deletions

diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 9c60f55aa7..39fd93acc6 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -36,6 +36,11 @@ void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
     as_IB(this)->onDraw(canvas, x, y, paint);
 }
 
+void SkImage::draw(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
+                   const SkPaint* paint) {
+    as_IB(this)->onDrawRectToRect(canvas, src, dst, paint);
+}
+
 GrTexture* SkImage::getTexture() {
     return as_IB(this)->onGetTexture();
 }
diff --git a/src/image/SkImagePriv.cpp b/src/image/SkImagePriv.cpp
index c44e439b72..4ff1c92bff 100644
--- a/src/image/SkImagePriv.cpp
+++ b/src/image/SkImagePriv.cpp
@@ -141,3 +141,33 @@ void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
     canvas->drawPicture(*picture);
     canvas->restoreToCount(saveCount);
 }
+
+void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
+                            const SkRect* src,  const SkRect& dst, const SkPaint* paint) {  
+    int saveCount = canvas->getSaveCount();  
+
+    SkMatrix matrix;
+    SkRect   tmpSrc;
+
+    if (NULL != src) {
+        tmpSrc = *src;
+    } else {
+        tmpSrc.set(0, 0,
+                   SkIntToScalar(picture->width()),
+                   SkIntToScalar(picture->height()));
+    }
+
+    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
+    if (paint && needs_layer(*paint)) {
+        canvas->saveLayer(&dst, paint);
+    } else {
+        canvas->save();
+    }
+    canvas->concat(matrix);
+    if (!paint || !needs_layer(*paint)) {
+        canvas->clipRect(tmpSrc);
+    }
+    
+    canvas->drawPicture(*picture);
+    canvas->restoreToCount(saveCount);
+}
diff --git a/src/image/SkImagePriv.h b/src/image/SkImagePriv.h
index fc14f67c58..2af8bbea92 100644
--- a/src/image/SkImagePriv.h
+++ b/src/image/SkImagePriv.h
@@ -39,6 +39,9 @@ extern SkImage* SkNewImageFromBitmap(const SkBitmap&, bool canSharePixelRef);
 extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
                                    SkScalar x, SkScalar y, const SkPaint*);
 
+extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
+                                   const SkRect*, const SkRect&, const SkPaint*);
+
 /**
  *  Return an SkImage whose contents are those of the specified picture. Note:
  *  The picture itself is unmodified, and may continue to be used for recording
diff --git a/src/image/SkImage_Base.h b/src/image/SkImage_Base.h
index 9ae13de4ae..431444dadb 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -15,6 +15,8 @@ public:
     SkImage_Base(int width, int height) : INHERITED(width, height) {}
 
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) = 0;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect* src, 
+                                  const SkRect& dst, const SkPaint*) = 0;
     virtual GrTexture* onGetTexture() { return NULL; }
 
     // return a read-only copy of the pixels. We promise to not modify them,
diff --git a/src/image/SkImage_Codec.cpp b/src/image/SkImage_Codec.cpp
index 61661de356..b9a8990838 100644
--- a/src/image/SkImage_Codec.cpp
+++ b/src/image/SkImage_Codec.cpp
@@ -19,6 +19,7 @@ public:
     virtual ~SkImage_Codec();
 
     virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
 
 private:
     SkData*     fEncodedData;
@@ -48,6 +49,17 @@ void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPai
     canvas->drawBitmap(fBitmap, x, y, paint);
 }
 
+void SkImage_Codec::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, 
+                                     const SkRect& dst, const SkPaint* paint) {
+    if (!fBitmap.pixelRef()) {
+        if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(),
+                                          &fBitmap)) {
+            return;
+        }
+    }
+    canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 SkImage* SkImage::NewEncodedData(SkData* data) {
diff --git a/src/image/SkImage_Gpu.cpp b/src/image/SkImage_Gpu.cpp
index b6e4211d28..d19d2100c3 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -21,6 +21,7 @@ public:
     virtual ~SkImage_Gpu();
 
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) SK_OVERRIDE;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect* src, const SkRect& dst, const SkPaint*) SK_OVERRIDE;
     virtual GrTexture* onGetTexture() SK_OVERRIDE;
     virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE {
         // TODO
@@ -61,6 +62,11 @@ void SkImage_Gpu::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
     canvas->drawBitmap(fBitmap, x, y, paint);
 }
 
+void SkImage_Gpu::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
+                         const SkPaint* paint) {
+    canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
+}
+
 GrTexture* SkImage_Gpu::onGetTexture() {
     return fTexture;
 }
diff --git a/src/image/SkImage_Picture.cpp b/src/image/SkImage_Picture.cpp
index be934fa238..87221de27b 100644
--- a/src/image/SkImage_Picture.cpp
+++ b/src/image/SkImage_Picture.cpp
@@ -15,6 +15,7 @@ public:
     virtual ~SkImage_Picture();
 
     virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
 
     SkPicture* getPicture() { return fPicture; }
 
@@ -41,6 +42,11 @@ void SkImage_Picture::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
     SkImagePrivDrawPicture(canvas, fPicture, x, y, paint);
 }
 
+void SkImage_Picture::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
+                             const SkPaint* paint) {
+    SkImagePrivDrawPicture(canvas, fPicture, src, dst, paint);
+}
+
 SkImage* SkNewImageFromPicture(const SkPicture* srcPicture) {
     /**
      *  We want to snapshot the playback status of the picture, w/o affecting
diff --git a/src/image/SkImage_Raster.cpp b/src/image/SkImage_Raster.cpp
index 5e1e8a02f3..3e2685606d 100644
--- a/src/image/SkImage_Raster.cpp
+++ b/src/image/SkImage_Raster.cpp
@@ -55,6 +55,7 @@ public:
     virtual ~SkImage_Raster();
 
     virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
     virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
 
     // exposed for SkSurface_Raster via SkNewImageFromPixelRef
@@ -109,6 +110,10 @@ void SkImage_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPa
     canvas->drawBitmap(fBitmap, x, y, paint);
 }
 
+void SkImage_Raster::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst, const SkPaint* paint) {
+    canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
+}
+
 bool SkImage_Raster::getROPixels(SkBitmap* dst) const {
     *dst = fBitmap;
     return true;