1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "SharedDIBSurface.h"
8
9 #include "cairo.h"
10
11 namespace mozilla {
12 namespace gfx {
13
14 static const cairo_user_data_key_t SHAREDDIB_KEY = {0};
15
Create(HDC adc,uint32_t aWidth,uint32_t aHeight,bool aTransparent)16 bool SharedDIBSurface::Create(HDC adc, uint32_t aWidth, uint32_t aHeight,
17 bool aTransparent) {
18 nsresult rv = mSharedDIB.Create(adc, aWidth, aHeight, aTransparent);
19 if (NS_FAILED(rv) || !mSharedDIB.IsValid()) return false;
20
21 InitSurface(aWidth, aHeight, aTransparent);
22 return true;
23 }
24
Attach(Handle aHandle,uint32_t aWidth,uint32_t aHeight,bool aTransparent)25 bool SharedDIBSurface::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
26 bool aTransparent) {
27 nsresult rv = mSharedDIB.Attach(aHandle, aWidth, aHeight, aTransparent);
28 if (NS_FAILED(rv) || !mSharedDIB.IsValid()) return false;
29
30 InitSurface(aWidth, aHeight, aTransparent);
31 return true;
32 }
33
InitSurface(uint32_t aWidth,uint32_t aHeight,bool aTransparent)34 void SharedDIBSurface::InitSurface(uint32_t aWidth, uint32_t aHeight,
35 bool aTransparent) {
36 long stride = long(aWidth * SharedDIB::kBytesPerPixel);
37 unsigned char* data = reinterpret_cast<unsigned char*>(mSharedDIB.GetBits());
38
39 gfxImageFormat format = aTransparent ? SurfaceFormat::A8R8G8B8_UINT32
40 : SurfaceFormat::X8R8G8B8_UINT32;
41
42 gfxImageSurface::InitWithData(data, IntSize(aWidth, aHeight), stride, format);
43
44 cairo_surface_set_user_data(mSurface, &SHAREDDIB_KEY, this, nullptr);
45 }
46
IsSharedDIBSurface(gfxASurface * aSurface)47 bool SharedDIBSurface::IsSharedDIBSurface(gfxASurface* aSurface) {
48 return aSurface && aSurface->GetType() == gfxSurfaceType::Image &&
49 aSurface->GetData(&SHAREDDIB_KEY);
50 }
51
52 } // namespace gfx
53 } // namespace mozilla
54