1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ipc/SharedDIBWin.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,141 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "SharedDIBWin.h"
1.10 +#include "gfxAlphaRecovery.h"
1.11 +#include "nsMathUtils.h"
1.12 +#include "nsDebug.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace gfx {
1.16 +
1.17 +static const uint32_t kBytesPerPixel = 4;
1.18 +static const uint32_t kByteAlign = 1 << gfxAlphaRecovery::GoodAlignmentLog2();
1.19 +static const uint32_t kHeaderBytes =
1.20 + (sizeof(BITMAPV4HEADER) + kByteAlign - 1) & ~(kByteAlign - 1);
1.21 +
1.22 +SharedDIBWin::SharedDIBWin() :
1.23 + mSharedHdc(nullptr)
1.24 + , mSharedBmp(nullptr)
1.25 + , mOldObj(nullptr)
1.26 +{
1.27 +}
1.28 +
1.29 +SharedDIBWin::~SharedDIBWin()
1.30 +{
1.31 + Close();
1.32 +}
1.33 +
1.34 +nsresult
1.35 +SharedDIBWin::Close()
1.36 +{
1.37 + if (mSharedHdc && mOldObj)
1.38 + ::SelectObject(mSharedHdc, mOldObj);
1.39 +
1.40 + if (mSharedHdc)
1.41 + ::DeleteObject(mSharedHdc);
1.42 +
1.43 + if (mSharedBmp)
1.44 + ::DeleteObject(mSharedBmp);
1.45 +
1.46 + mSharedHdc = nullptr;
1.47 + mOldObj = mSharedBmp = nullptr;
1.48 +
1.49 + SharedDIB::Close();
1.50 +
1.51 + return NS_OK;
1.52 +}
1.53 +
1.54 +nsresult
1.55 +SharedDIBWin::Create(HDC aHdc, uint32_t aWidth, uint32_t aHeight,
1.56 + bool aTransparent)
1.57 +{
1.58 + Close();
1.59 +
1.60 + // create the offscreen shared dib
1.61 + BITMAPV4HEADER bmih;
1.62 + uint32_t size = SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
1.63 +
1.64 + nsresult rv = SharedDIB::Create(size);
1.65 + if (NS_FAILED(rv))
1.66 + return rv;
1.67 +
1.68 + if (NS_FAILED(SetupSurface(aHdc, &bmih))) {
1.69 + Close();
1.70 + return NS_ERROR_FAILURE;
1.71 + }
1.72 +
1.73 + return NS_OK;
1.74 +}
1.75 +
1.76 +nsresult
1.77 +SharedDIBWin::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
1.78 + bool aTransparent)
1.79 +{
1.80 + Close();
1.81 +
1.82 + BITMAPV4HEADER bmih;
1.83 + SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
1.84 +
1.85 + nsresult rv = SharedDIB::Attach(aHandle, 0);
1.86 + if (NS_FAILED(rv))
1.87 + return rv;
1.88 +
1.89 + if (NS_FAILED(SetupSurface(nullptr, &bmih))) {
1.90 + Close();
1.91 + return NS_ERROR_FAILURE;
1.92 + }
1.93 +
1.94 + return NS_OK;
1.95 +}
1.96 +
1.97 +uint32_t
1.98 +SharedDIBWin::SetupBitmapHeader(uint32_t aWidth, uint32_t aHeight,
1.99 + bool aTransparent, BITMAPV4HEADER *aHeader)
1.100 +{
1.101 + // D3D cannot handle an offscreen memory that pitch (SysMemPitch) is negative.
1.102 + // So we create top-to-bottom DIB.
1.103 + memset((void*)aHeader, 0, sizeof(BITMAPV4HEADER));
1.104 + aHeader->bV4Size = sizeof(BITMAPV4HEADER);
1.105 + aHeader->bV4Width = aWidth;
1.106 + aHeader->bV4Height = -LONG(aHeight); // top-to-buttom DIB
1.107 + aHeader->bV4Planes = 1;
1.108 + aHeader->bV4BitCount = 32;
1.109 + aHeader->bV4V4Compression = BI_BITFIELDS;
1.110 + aHeader->bV4RedMask = 0x00FF0000;
1.111 + aHeader->bV4GreenMask = 0x0000FF00;
1.112 + aHeader->bV4BlueMask = 0x000000FF;
1.113 +
1.114 + if (aTransparent)
1.115 + aHeader->bV4AlphaMask = 0xFF000000;
1.116 +
1.117 + return (kHeaderBytes + (-aHeader->bV4Height * aHeader->bV4Width * kBytesPerPixel));
1.118 +}
1.119 +
1.120 +nsresult
1.121 +SharedDIBWin::SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr)
1.122 +{
1.123 + mSharedHdc = ::CreateCompatibleDC(aHdc);
1.124 +
1.125 + if (!mSharedHdc)
1.126 + return NS_ERROR_FAILURE;
1.127 +
1.128 + mSharedBmp = ::CreateDIBSection(mSharedHdc,
1.129 + (BITMAPINFO*)aHdr,
1.130 + DIB_RGB_COLORS,
1.131 + &mBitmapBits,
1.132 + mShMem->handle(),
1.133 + kHeaderBytes);
1.134 + if (!mSharedBmp)
1.135 + return NS_ERROR_FAILURE;
1.136 +
1.137 + mOldObj = SelectObject(mSharedHdc, mSharedBmp);
1.138 +
1.139 + return NS_OK;
1.140 +}
1.141 +
1.142 +
1.143 +} // gfx
1.144 +} // mozilla
