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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ui/base/dragdrop/drag_utils.h" | |
| 6 | |
| 7 #include <objidl.h> | |
| 8 #include <shlobj.h> | |
| 9 #include <shobjidl.h> | |
| 10 | |
| 11 #include "base/win/scoped_comptr.h" | |
| 12 #include "base/win/scoped_hdc.h" | |
| 13 #include "third_party/skia/include/core/SkBitmap.h" | |
| 14 #include "ui/base/dragdrop/os_exchange_data.h" | |
| 15 #include "ui/base/dragdrop/os_exchange_data_provider_win.h" | |
| 16 #include "ui/gfx/canvas.h" | |
| 17 #include "ui/gfx/gdi_util.h" | |
| 18 #include "ui/gfx/geometry/size.h" | |
| 19 #include "ui/gfx/image/image_skia.h" | |
| 20 #include "ui/gfx/skbitmap_operations.h" | |
| 21 | |
| 22 namespace drag_utils { | |
| 23 | |
| 24 static void SetDragImageOnDataObject(HBITMAP hbitmap, | |
| 25 const gfx::Size& size_in_pixels, | |
| 26 const gfx::Vector2d& cursor_offset, | |
| 27 IDataObject* data_object) { | |
| 28 base::win::ScopedComPtr<IDragSourceHelper> helper; | |
| 29 HRESULT rv = CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, | |
| 30 IID_IDragSourceHelper, helper.ReceiveVoid()); | |
| 31 if (SUCCEEDED(rv)) { | |
| 32 SHDRAGIMAGE sdi; | |
| 33 sdi.sizeDragImage = size_in_pixels.ToSIZE(); | |
| 34 sdi.crColorKey = 0xFFFFFFFF; | |
| 35 sdi.hbmpDragImage = hbitmap; | |
| 36 sdi.ptOffset = gfx::PointAtOffsetFromOrigin(cursor_offset).ToPOINT(); | |
| 37 helper->InitializeFromBitmap(&sdi, data_object); | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 // Blit the contents of the canvas to a new HBITMAP. It is the caller's | |
| 42 // responsibility to release the |bits| buffer. | |
| 43 static HBITMAP CreateHBITMAPFromSkBitmap(const SkBitmap& sk_bitmap) { | |
| 44 base::win::ScopedGetDC screen_dc(NULL); | |
| 45 BITMAPINFOHEADER header; | |
| 46 gfx::CreateBitmapHeader(sk_bitmap.width(), sk_bitmap.height(), &header); | |
| 47 void* bits; | |
| 48 HBITMAP bitmap = | |
| 49 CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header), | |
| 50 DIB_RGB_COLORS, &bits, NULL, 0); | |
| 51 if (!bitmap || !bits) | |
| 52 return NULL; | |
| 53 DCHECK_EQ(sk_bitmap.rowBytes(), static_cast<size_t>(sk_bitmap.width() * 4)); | |
| 54 SkAutoLockPixels lock(sk_bitmap); | |
| 55 memcpy( | |
| 56 bits, sk_bitmap.getPixels(), sk_bitmap.height() * sk_bitmap.rowBytes()); | |
| 57 return bitmap; | |
| 58 } | |
| 59 | |
| 60 void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia, | |
| 61 const gfx::Vector2d& cursor_offset, | |
| 62 ui::OSExchangeData* data_object) { | |
| 63 DCHECK(data_object && !image_skia.size().IsEmpty()); | |
| 64 // InitializeFromBitmap() doesn't expect an alpha channel and is confused | |
| 65 // by premultiplied colors, so unpremultiply the bitmap. | |
| 66 // SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap. | |
| 67 HBITMAP bitmap = CreateHBITMAPFromSkBitmap( | |
| 68 SkBitmapOperations::UnPreMultiply(*image_skia.bitmap())); | |
| 69 if (bitmap) { | |
| 70 // Attach 'bitmap' to the data_object. | |
| 71 SetDragImageOnDataObject( | |
| 72 bitmap, | |
| 73 gfx::Size(image_skia.bitmap()->width(), image_skia.bitmap()->height()), | |
| 74 cursor_offset, | |
| 75 ui::OSExchangeDataProviderWin::GetIDataObject(*data_object)); | |
| 76 } | |
| 77 | |
| 78 // TODO: the above code is used in non-Ash, while below is used in Ash. If we | |
| 79 // could figure this context out then we wouldn't do unnecessary work. However | |
| 80 // as it stands getting this information in ui/base would be a layering | |
| 81 // violation. | |
| 82 data_object->provider().SetDragImage(image_skia, cursor_offset); | |
| 83 } | |
| 84 | |
| 85 } // namespace drag_utils | |
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