implement Canvas.toDataURL

The Chrome implementation serves as the base for this code.
The test is at http://philip.html5.org/tests/canvas/suite/tests/index.toDataURL.html

Change-Id: I873518362793fbe1c99686fbe240cfe7c27d1493
http://b/2620678

1 files changed, 21 insertions, 7 deletions

diff --git a/WebCore/platform/graphics/android/ImageBufferAndroid.cpp b/WebCore/platform/graphics/android/ImageBufferAndroid.cpp
index 6efccfe..92c585f 100644
--- a/WebCore/platform/graphics/android/ImageBufferAndroid.cpp
+++ b/WebCore/platform/graphics/android/ImageBufferAndroid.cpp
@@ -24,11 +24,11 @@
  */
 
 #include "config.h"
-#include "BitmapImage.h"
 #include "ImageBuffer.h"
-#include "ImageData.h"
-#include "NotImplemented.h"
 
+#include "Base64.h"
+#include "BitmapImage.h"
+#include "ImageData.h"
 #include "android_graphics.h"
 #include "GraphicsContext.h"
 #include "PlatformGraphicsContext.h"
@@ -36,6 +36,8 @@
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkDevice.h"
+#include "SkImageEncoder.h"
+#include "SkStream.h"
 #include "SkUnPreMultiply.h"
 
 using namespace std;
@@ -208,10 +210,22 @@ void ImageBuffer::putUnmultipliedImageData(ImageData* source, const IntRect& sou
 
     
 String ImageBuffer::toDataURL(const String&) const
-{
-    // leaving this unimplemented, until I understand what its for (and what it
-    // really is).
-    return "data:,";    // I think this means we couldn't make the data url
+{  
+    // Encode the image into a vector.
+    SkDynamicMemoryWStream pngStream;
+    const SkBitmap& dst = android_gc2canvas(context())->getDevice()->accessBitmap(true);
+    SkImageEncoder::EncodeStream(&pngStream, dst, SkImageEncoder::kPNG_Type, 100);
+
+    // Convert it into base64.
+    Vector<char> pngEncodedData;
+    pngEncodedData.append(pngStream.getStream(), pngStream.getOffset());
+    Vector<char> base64EncodedData;
+    base64Encode(pngEncodedData, base64EncodedData);
+    // Append with a \0 so that it's a valid string.
+    base64EncodedData.append('\0');
+
+    // And the resulting string.
+    return String::format("data:image/png;base64,%s", base64EncodedData.data());
 }
 
 }