michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "SharedDIBSurface.h"
michael@0: 
michael@0: #include "cairo.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: static const cairo_user_data_key_t SHAREDDIB_KEY = {0};
michael@0: 
michael@0: static const long kBytesPerPixel = 4;
michael@0: 
michael@0: bool
michael@0: SharedDIBSurface::Create(HDC adc, uint32_t aWidth, uint32_t aHeight,
michael@0:                          bool aTransparent)
michael@0: {
michael@0:   nsresult rv = mSharedDIB.Create(adc, aWidth, aHeight, aTransparent);
michael@0:   if (NS_FAILED(rv) || !mSharedDIB.IsValid())
michael@0:     return false;
michael@0: 
michael@0:   InitSurface(aWidth, aHeight, aTransparent);
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: SharedDIBSurface::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
michael@0:                          bool aTransparent)
michael@0: {
michael@0:   nsresult rv = mSharedDIB.Attach(aHandle, aWidth, aHeight, aTransparent);
michael@0:   if (NS_FAILED(rv) || !mSharedDIB.IsValid())
michael@0:     return false;
michael@0: 
michael@0:   InitSurface(aWidth, aHeight, aTransparent);
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void
michael@0: SharedDIBSurface::InitSurface(uint32_t aWidth, uint32_t aHeight,
michael@0:                               bool aTransparent)
michael@0: {
michael@0:   long stride = long(aWidth * kBytesPerPixel);
michael@0:   unsigned char* data = reinterpret_cast<unsigned char*>(mSharedDIB.GetBits());
michael@0: 
michael@0:   gfxImageFormat format = aTransparent ? gfxImageFormat::ARGB32 : gfxImageFormat::RGB24;
michael@0: 
michael@0:   gfxImageSurface::InitWithData(data, gfxIntSize(aWidth, aHeight),
michael@0:                                 stride, format);
michael@0: 
michael@0:   cairo_surface_set_user_data(mSurface, &SHAREDDIB_KEY, this, nullptr);
michael@0: }
michael@0: 
michael@0: bool
michael@0: SharedDIBSurface::IsSharedDIBSurface(gfxASurface* aSurface)
michael@0: {
michael@0:   return aSurface &&
michael@0:     aSurface->GetType() == gfxSurfaceType::Image &&
michael@0:     aSurface->GetData(&SHAREDDIB_KEY);
michael@0: }
michael@0: 
michael@0: } // namespace gfx
michael@0: } // namespace mozilla