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comparison: gfx/ipc/SharedDIBWin.cpp
gfx/ipc/SharedDIBWin.cpp
- changeset 0
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| -1:000000000000 | 0:a961e2075741 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "SharedDIBWin.h" | |
| 7 #include "gfxAlphaRecovery.h" | |
| 8 #include "nsMathUtils.h" | |
| 9 #include "nsDebug.h" | |
| 10 | |
| 11 namespace mozilla { | |
| 12 namespace gfx { | |
| 13 | |
| 14 static const uint32_t kBytesPerPixel = 4; | |
| 15 static const uint32_t kByteAlign = 1 << gfxAlphaRecovery::GoodAlignmentLog2(); | |
| 16 static const uint32_t kHeaderBytes = | |
| 17 (sizeof(BITMAPV4HEADER) + kByteAlign - 1) & ~(kByteAlign - 1); | |
| 18 | |
| 19 SharedDIBWin::SharedDIBWin() : | |
| 20 mSharedHdc(nullptr) | |
| 21 , mSharedBmp(nullptr) | |
| 22 , mOldObj(nullptr) | |
| 23 { | |
| 24 } | |
| 25 | |
| 26 SharedDIBWin::~SharedDIBWin() | |
| 27 { | |
| 28 Close(); | |
| 29 } | |
| 30 | |
| 31 nsresult | |
| 32 SharedDIBWin::Close() | |
| 33 { | |
| 34 if (mSharedHdc && mOldObj) | |
| 35 ::SelectObject(mSharedHdc, mOldObj); | |
| 36 | |
| 37 if (mSharedHdc) | |
| 38 ::DeleteObject(mSharedHdc); | |
| 39 | |
| 40 if (mSharedBmp) | |
| 41 ::DeleteObject(mSharedBmp); | |
| 42 | |
| 43 mSharedHdc = nullptr; | |
| 44 mOldObj = mSharedBmp = nullptr; | |
| 45 | |
| 46 SharedDIB::Close(); | |
| 47 | |
| 48 return NS_OK; | |
| 49 } | |
| 50 | |
| 51 nsresult | |
| 52 SharedDIBWin::Create(HDC aHdc, uint32_t aWidth, uint32_t aHeight, | |
| 53 bool aTransparent) | |
| 54 { | |
| 55 Close(); | |
| 56 | |
| 57 // create the offscreen shared dib | |
| 58 BITMAPV4HEADER bmih; | |
| 59 uint32_t size = SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih); | |
| 60 | |
| 61 nsresult rv = SharedDIB::Create(size); | |
| 62 if (NS_FAILED(rv)) | |
| 63 return rv; | |
| 64 | |
| 65 if (NS_FAILED(SetupSurface(aHdc, &bmih))) { | |
| 66 Close(); | |
| 67 return NS_ERROR_FAILURE; | |
| 68 } | |
| 69 | |
| 70 return NS_OK; | |
| 71 } | |
| 72 | |
| 73 nsresult | |
| 74 SharedDIBWin::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight, | |
| 75 bool aTransparent) | |
| 76 { | |
| 77 Close(); | |
| 78 | |
| 79 BITMAPV4HEADER bmih; | |
| 80 SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih); | |
| 81 | |
| 82 nsresult rv = SharedDIB::Attach(aHandle, 0); | |
| 83 if (NS_FAILED(rv)) | |
| 84 return rv; | |
| 85 | |
| 86 if (NS_FAILED(SetupSurface(nullptr, &bmih))) { | |
| 87 Close(); | |
| 88 return NS_ERROR_FAILURE; | |
| 89 } | |
| 90 | |
| 91 return NS_OK; | |
| 92 } | |
| 93 | |
| 94 uint32_t | |
| 95 SharedDIBWin::SetupBitmapHeader(uint32_t aWidth, uint32_t aHeight, | |
| 96 bool aTransparent, BITMAPV4HEADER *aHeader) | |
| 97 { | |
| 98 // D3D cannot handle an offscreen memory that pitch (SysMemPitch) is negative. | |
| 99 // So we create top-to-bottom DIB. | |
| 100 memset((void*)aHeader, 0, sizeof(BITMAPV4HEADER)); | |
| 101 aHeader->bV4Size = sizeof(BITMAPV4HEADER); | |
| 102 aHeader->bV4Width = aWidth; | |
| 103 aHeader->bV4Height = -LONG(aHeight); // top-to-buttom DIB | |
| 104 aHeader->bV4Planes = 1; | |
| 105 aHeader->bV4BitCount = 32; | |
| 106 aHeader->bV4V4Compression = BI_BITFIELDS; | |
| 107 aHeader->bV4RedMask = 0x00FF0000; | |
| 108 aHeader->bV4GreenMask = 0x0000FF00; | |
| 109 aHeader->bV4BlueMask = 0x000000FF; | |
| 110 | |
| 111 if (aTransparent) | |
| 112 aHeader->bV4AlphaMask = 0xFF000000; | |
| 113 | |
| 114 return (kHeaderBytes + (-aHeader->bV4Height * aHeader->bV4Width * kBytesPerPixel)); | |
| 115 } | |
| 116 | |
| 117 nsresult | |
| 118 SharedDIBWin::SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr) | |
| 119 { | |
| 120 mSharedHdc = ::CreateCompatibleDC(aHdc); | |
| 121 | |
| 122 if (!mSharedHdc) | |
| 123 return NS_ERROR_FAILURE; | |
| 124 | |
| 125 mSharedBmp = ::CreateDIBSection(mSharedHdc, | |
| 126 (BITMAPINFO*)aHdr, | |
| 127 DIB_RGB_COLORS, | |
| 128 &mBitmapBits, | |
| 129 mShMem->handle(), | |
| 130 kHeaderBytes); | |
| 131 if (!mSharedBmp) | |
| 132 return NS_ERROR_FAILURE; | |
| 133 | |
| 134 mOldObj = SelectObject(mSharedHdc, mSharedBmp); | |
| 135 | |
| 136 return NS_OK; | |
| 137 } | |
| 138 | |
| 139 | |
| 140 } // gfx | |
| 141 } // mozilla |
