In which a series of things around attachToCanvas and writePixels are fixed

Review URL: https://codereview.appspot.com/6506051/



git-svn-id: http://skia.googlecode.com/svn/trunk@5341 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index dc6da11..ba8042d 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -644,7 +644,11 @@
                            Config8888 config8888) {
     SkDevice* device = this->getDevice();
     if (device) {
-        device->writePixels(bitmap, x, y, config8888);
+        if (SkIRect::Intersects(SkIRect::MakeSize(this->getDeviceSize()),
+                                SkIRect::MakeXYWH(x, y, bitmap.width(), bitmap.height()))) {
+            device->accessBitmap(true);
+            device->writePixels(bitmap, x, y, config8888);
+        }
     }
 }
 
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index f8bed65..10d89d5 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -9,6 +9,7 @@
 #include "SkDraw.h"
 #include "SkImageFilter.h"
 #include "SkMetaData.h"
+#include "SkRasterClip.h"
 #include "SkRect.h"
 
 SK_DEFINE_INST_COUNT(SkDevice)
@@ -299,8 +300,13 @@
 
     SkPaint paint;
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
-    SkCanvas canvas(this);
-    canvas.drawSprite(*sprite, x, y, &paint);
+    SkRasterClip clip(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()));
+    SkDraw  draw;
+    draw.fRC = &clip;
+    draw.fClip = &clip.bwRgn();
+    draw.fBitmap = &fBitmap; // canvas should have already called accessBitmap
+    draw.fMatrix = &SkMatrix::I();
+    this->drawSprite(draw, *sprite, x, y, paint);
 }
 
 ///////////////////////////////////////////////////////////////////////////////