| // Copyright (c) 2012 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 "ui/base/dragdrop/drag_utils.h" |
| |
| #include <objidl.h> |
| #include <shlobj.h> |
| #include <shobjidl.h> |
| |
| #include "base/win/scoped_comptr.h" |
| #include "base/win/scoped_hdc.h" |
| #include "third_party/skia/include/core/SkBitmap.h" |
| #include "ui/base/dragdrop/os_exchange_data.h" |
| #include "ui/base/dragdrop/os_exchange_data_provider_win.h" |
| #include "ui/gfx/canvas.h" |
| #include "ui/gfx/gdi_util.h" |
| #include "ui/gfx/image/image_skia.h" |
| #include "ui/gfx/skbitmap_operations.h" |
| |
| namespace drag_utils { |
| |
| static void SetDragImageOnDataObject(HBITMAP hbitmap, |
| const gfx::Size& size, |
| const gfx::Vector2d& cursor_offset, |
| IDataObject* data_object) { |
| base::win::ScopedComPtr<IDragSourceHelper> helper; |
| HRESULT rv = CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, |
| IID_IDragSourceHelper, helper.ReceiveVoid()); |
| if (SUCCEEDED(rv)) { |
| SHDRAGIMAGE sdi; |
| sdi.sizeDragImage = size.ToSIZE(); |
| sdi.crColorKey = 0xFFFFFFFF; |
| sdi.hbmpDragImage = hbitmap; |
| sdi.ptOffset = gfx::PointAtOffsetFromOrigin(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 CreateHBITMAPFromSkBitmap(const SkBitmap& sk_bitmap) { |
| base::win::ScopedGetDC screen_dc(NULL); |
| BITMAPINFOHEADER header; |
| gfx::CreateBitmapHeader(sk_bitmap.width(), sk_bitmap.height(), &header); |
| void* bits; |
| HBITMAP bitmap = |
| CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header), |
| DIB_RGB_COLORS, &bits, NULL, 0); |
| if (!bitmap || !bits) |
| return NULL; |
| DCHECK_EQ(sk_bitmap.rowBytes(), static_cast<size_t>(sk_bitmap.width() * 4)); |
| SkAutoLockPixels lock(sk_bitmap); |
| memcpy( |
| bits, sk_bitmap.getPixels(), sk_bitmap.height() * sk_bitmap.rowBytes()); |
| return bitmap; |
| } |
| |
| void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia, |
| const gfx::Size& size, |
| const gfx::Vector2d& cursor_offset, |
| ui::OSExchangeData* data_object) { |
| DCHECK(data_object && !size.IsEmpty()); |
| // InitializeFromBitmap() doesn't expect an alpha channel and is confused |
| // by premultiplied colors, so unpremultiply the bitmap. |
| // SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap. |
| HBITMAP bitmap = CreateHBITMAPFromSkBitmap( |
| SkBitmapOperations::UnPreMultiply(*image_skia.bitmap())); |
| if (bitmap) { |
| // Attach 'bitmap' to the data_object. |
| SetDragImageOnDataObject(bitmap, size, cursor_offset, |
| ui::OSExchangeDataProviderWin::GetIDataObject(*data_object)); |
| } |
| |
| #if defined(USE_AURA) |
| // TODO: the above code is used in non-Ash, while below is used in Ash. If we |
| // could figure this context out then we wouldn't do unnecessary work. However |
| // as it stands getting this information in ui/base would be a layering |
| // violation. |
| data_object->provider().SetDragImage(image_skia, cursor_offset); |
| #endif |
| } |
| |
| } // namespace drag_utils |