PassOwnPtr<Vector<char>> PictureSnapshot::replay(unsigned fromStep, unsigned toStep, double scale) const
{
const SkIRect bounds = m_picture->cullRect().roundOut();
// TODO(fmalita): convert this to SkSurface/SkImage, drop the intermediate SkBitmap.
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()));
bitmap.eraseARGB(0, 0, 0, 0);
{
ReplayingCanvas canvas(bitmap, fromStep, toStep);
canvas.scale(scale, scale);
canvas.resetStepCount();
m_picture->playback(&canvas, &canvas);
}
OwnPtr<Vector<char>> base64Data = adoptPtr(new Vector<char>());
Vector<char> encodedImage;
RefPtr<SkImage> image = adoptRef(SkImage::NewFromBitmap(bitmap));
if (!image)
return nullptr;
ImagePixelLocker pixelLocker(image, kUnpremul_SkAlphaType);
ImageDataBuffer imageData(IntSize(image->width(), image->height()),
static_cast<const unsigned char*>(pixelLocker.pixels()));
if (!PNGImageEncoder::encode(imageData, reinterpret_cast<Vector<unsigned char>*>(&encodedImage)))
return nullptr;
base64Encode(encodedImage, *base64Data);
return base64Data.release();
}
PassOwnPtr<Vector<char>> PictureSnapshot::replay(unsigned fromStep, unsigned toStep, double scale) const
{
const SkIRect bounds = m_picture->cullRect().roundOut();
// TODO(fmalita): convert this to SkSurface/SkImage, drop the intermediate SkBitmap.
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()));
bitmap.eraseARGB(0, 0, 0, 0);
{
ReplayingCanvas canvas(bitmap, fromStep, toStep);
// Disable LCD text preemptively, because the picture opacity is unknown.
// The canonical API involves SkSurface props, but since we're not SkSurface-based
// at this point (see TODO above) we (ab)use saveLayer for this purpose.
SkAutoCanvasRestore autoRestore(&canvas, false);
canvas.saveLayer(nullptr, nullptr);
canvas.scale(scale, scale);
canvas.resetStepCount();
m_picture->playback(&canvas, &canvas);
}
OwnPtr<Vector<char>> base64Data = adoptPtr(new Vector<char>());
Vector<char> encodedImage;
RefPtr<SkImage> image = adoptRef(SkImage::NewFromBitmap(bitmap));
if (!image)
return nullptr;
ImagePixelLocker pixelLocker(image, kUnpremul_SkAlphaType, kRGBA_8888_SkColorType);
ImageDataBuffer imageData(IntSize(image->width(), image->height()),
static_cast<const unsigned char*>(pixelLocker.pixels()));
if (!PNGImageEncoder::encode(imageData, reinterpret_cast<Vector<unsigned char>*>(&encodedImage)))
return nullptr;
base64Encode(encodedImage, *base64Data);
return base64Data.release();
}
