DragImageRef fitDragImageToMaxSize(DragImageRef image, const IntSize& srcSize, const IntSize& size)
{
float heightResizeRatio = 0.0f;
float widthResizeRatio = 0.0f;
float resizeRatio = -1.0f;
IntSize originalSize = dragImageSize(image);
if (srcSize.width() > size.width()) {
widthResizeRatio = size.width() / (float)srcSize.width();
resizeRatio = widthResizeRatio;
}
if (srcSize.height() > size.height()) {
heightResizeRatio = size.height() / (float)srcSize.height();
if ((resizeRatio < 0.0f) || (resizeRatio > heightResizeRatio))
resizeRatio = heightResizeRatio;
}
if (srcSize == originalSize)
return resizeRatio > 0.0f ? scaleDragImage(image, FloatSize(resizeRatio, resizeRatio)) : image;
// The image was scaled in the webpage so at minimum we must account for that scaling
float scalex = srcSize.width() / (float)originalSize.width();
float scaley = srcSize.height() / (float)originalSize.height();
if (resizeRatio > 0.0f) {
scalex *= resizeRatio;
scaley *= resizeRatio;
}
return scaleDragImage(image, FloatSize(scalex, scaley));
}
void DragClientImpl::startDrag(DragImageRef dragImage,
const IntPoint& dragImageOrigin,
const IntPoint& eventPos,
Clipboard* clipboard,
Frame* frame,
bool isLinkDrag)
{
// Add a ref to the frame just in case a load occurs mid-drag.
RefPtr<Frame> frameProtector = frame;
WebDragData dragData = static_cast<ClipboardChromium*>(clipboard)->dataObject();
DragOperation dragOperationMask = clipboard->sourceOperation();
IntSize offsetSize(eventPos - dragImageOrigin);
WebPoint offsetPoint(offsetSize.width(), offsetSize.height());
if (dragImage && dragImage->bitmap && m_webView->deviceScaleFactor() != dragImage->resolutionScale) {
ASSERT(dragImage->resolutionScale > 0);
float scale = m_webView->deviceScaleFactor() / dragImage->resolutionScale;
dragImage = scaleDragImage(dragImage, WebCore::FloatSize(scale, scale));
}
m_webView->startDragging(frame, dragData, static_cast<WebDragOperationsMask>(dragOperationMask), (dragImage && dragImage->bitmap) ? WebImage(*dragImage->bitmap) : WebImage(), offsetPoint);
}
