Blob creation methods for ImageBitmap.

Source/core/page/ImageBitmap.cpp

Index: Source/core/page/ImageBitmap.cpp
diff --git a/Source/core/page/ImageBitmap.cpp b/Source/core/page/ImageBitmap.cpp
index 2f83dd31d15ef34c1697d544f39b783227b699fb..422dcf0e1adb1eee4b9310a898f54c33da65088a 100644
--- a/Source/core/page/ImageBitmap.cpp
+++ b/Source/core/page/ImageBitmap.cpp
@@ -113,6 +113,17 @@ ImageBitmap::ImageBitmap(ImageBitmap* bitmap, const IntRect& cropRect)
     ScriptWrappable::init(this);
 }
 
+ImageBitmap::ImageBitmap(Image* image, const IntRect& cropRect)
+    : m_cropRect(cropRect)
+    , m_imageElement(0)
+{
+    IntRect srcRect = intersection(cropRect, IntRect(IntPoint(), image->size()));
+    m_bitmap = cropImage(image, cropRect);
+    m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())),  srcRect.size());
+
+    ScriptWrappable::init(this);
+}
+
 ImageBitmap::~ImageBitmap()
 {
     if (m_imageElement)
@@ -154,6 +165,13 @@ PassRefPtr<ImageBitmap> ImageBitmap::create(ImageBitmap* bitmap, const IntRect&
     return imageBitmap.release();
 }
 
+PassRefPtr<ImageBitmap> ImageBitmap::create(Image* image, const IntRect& cropRect)
+{
+    IntRect normalizedCropRect = normalizeRect(cropRect);
+    RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(image, normalizedCropRect)));

[do-not-use, 2013/08/12 15:15:59]

nit: we don't really need this local variable, we can return directly.

[arbesfeld, 2013/08/12 15:49:40]

Done.

+    return imageBitmap.release();
+}
+
 void ImageBitmap::notifyImageSourceChanged()
 {
     m_bitmap = cropImage(m_imageElement->cachedImage()->image(), m_cropRect);