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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "views/drag_utils.h"
#include <objidl.h>
#include <shlobj.h>
#include <shobjidl.h>
#include "app/os_exchange_data.h"
#include "app/os_exchange_data_provider_win.h"
#include "gfx/canvas_skia.h"
#include "gfx/gdi_util.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkUnPreMultiply.h"
namespace drag_utils {
static void SetDragImageOnDataObject(HBITMAP hbitmap,
const gfx::Size& size,
const gfx::Point& cursor_offset,
IDataObject* data_object) {
IDragSourceHelper* helper = NULL;
HRESULT rv = CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER,
IID_IDragSourceHelper, reinterpret_cast<LPVOID*>(&helper));
if (SUCCEEDED(rv)) {
SHDRAGIMAGE sdi;
sdi.sizeDragImage = size.ToSIZE();
sdi.crColorKey = 0xFFFFFFFF;
sdi.hbmpDragImage = hbitmap;
sdi.ptOffset = cursor_offset.ToPOINT();
helper->InitializeFromBitmap(&sdi, data_object);
}
};
// Blit the contents of the canvas to a new HBITMAP. It is the caller's
// responsibility to release the |bits| buffer.
static HBITMAP CreateBitmapFromCanvas(const gfx::CanvasSkia& canvas,
int width,
int height) {
HDC screen_dc = GetDC(NULL);
BITMAPINFOHEADER header;
gfx::CreateBitmapHeader(width, height, &header);
void* bits;
HBITMAP bitmap =
CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header),
DIB_RGB_COLORS, &bits, NULL, 0);
HDC compatible_dc = CreateCompatibleDC(screen_dc);
HGDIOBJ old_object = SelectObject(compatible_dc, bitmap);
BitBlt(compatible_dc, 0, 0, width, height,
canvas.getTopPlatformDevice().getBitmapDC(),
0, 0, SRCCOPY);
SelectObject(compatible_dc, old_object);
ReleaseDC(NULL, compatible_dc);
ReleaseDC(NULL, screen_dc);
return bitmap;
}
void SetDragImageOnDataObject(const SkBitmap& sk_bitmap,
const gfx::Size& size,
const gfx::Point& cursor_offset,
OSExchangeData* data_object) {
gfx::CanvasSkia canvas(sk_bitmap.width(), sk_bitmap.height(),
/*is_opaque=*/true);
SkBitmap opaque_bitmap;
if (sk_bitmap.isOpaque()) {
opaque_bitmap = sk_bitmap;
} else {
// InitializeFromBitmap() doesn't expect an alpha channel and is confused
// by premultiplied colors, so unpremultiply the bitmap.
SkBitmap tmp_bitmap;
tmp_bitmap.setConfig(
sk_bitmap.config(), sk_bitmap.width(), sk_bitmap.height());
tmp_bitmap.allocPixels();
SkAutoLockPixels lock(tmp_bitmap);
const int kBytesPerPixel = 4;
for (int y = 0; y < tmp_bitmap.height(); y++) {
for (int x = 0; x < tmp_bitmap.width(); x++) {
uint32 src_pixel = *sk_bitmap.getAddr32(x, y);
uint32* dst_pixel = tmp_bitmap.getAddr32(x, y);
SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(src_pixel);
*dst_pixel = unmultiplied;
}
}
tmp_bitmap.setIsOpaque(true);
opaque_bitmap = tmp_bitmap;
}
canvas.DrawBitmapInt(opaque_bitmap, 0, 0);
DCHECK(data_object && !size.IsEmpty());
// SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap.
HBITMAP bitmap = CreateBitmapFromCanvas(canvas, size.width(), size.height());
// Attach 'bitmap' to the data_object.
SetDragImageOnDataObject(bitmap, size, cursor_offset,
OSExchangeDataProviderWin::GetIDataObject(*data_object));
}
} // namespace drag_utils
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