mirror of
https://github.com/mozilla/gecko-dev.git
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142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SharedDIBWin.h"
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#include "gfxAlphaRecovery.h"
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#include "nsMathUtils.h"
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#include "nsDebug.h"
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namespace mozilla {
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namespace gfx {
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static const uint32_t kBytesPerPixel = 4;
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static const uint32_t kByteAlign = 1 << gfxAlphaRecovery::GoodAlignmentLog2();
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static const uint32_t kHeaderBytes =
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(sizeof(BITMAPV4HEADER) + kByteAlign - 1) & ~(kByteAlign - 1);
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SharedDIBWin::SharedDIBWin() :
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mSharedHdc(nullptr)
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, mSharedBmp(nullptr)
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, mOldObj(nullptr)
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{
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}
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SharedDIBWin::~SharedDIBWin()
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{
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Close();
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}
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nsresult
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SharedDIBWin::Close()
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{
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if (mSharedHdc && mOldObj)
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::SelectObject(mSharedHdc, mOldObj);
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if (mSharedHdc)
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::DeleteObject(mSharedHdc);
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if (mSharedBmp)
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::DeleteObject(mSharedBmp);
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mSharedHdc = nullptr;
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mOldObj = mSharedBmp = nullptr;
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SharedDIB::Close();
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return NS_OK;
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}
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nsresult
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SharedDIBWin::Create(HDC aHdc, uint32_t aWidth, uint32_t aHeight,
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bool aTransparent)
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{
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Close();
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// create the offscreen shared dib
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BITMAPV4HEADER bmih;
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uint32_t size = SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
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nsresult rv = SharedDIB::Create(size);
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if (NS_FAILED(rv))
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return rv;
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if (NS_FAILED(SetupSurface(aHdc, &bmih))) {
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Close();
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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nsresult
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SharedDIBWin::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
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bool aTransparent)
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{
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Close();
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BITMAPV4HEADER bmih;
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SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
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nsresult rv = SharedDIB::Attach(aHandle, 0);
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if (NS_FAILED(rv))
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return rv;
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if (NS_FAILED(SetupSurface(nullptr, &bmih))) {
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Close();
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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uint32_t
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SharedDIBWin::SetupBitmapHeader(uint32_t aWidth, uint32_t aHeight,
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bool aTransparent, BITMAPV4HEADER *aHeader)
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{
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// D3D cannot handle an offscreen memory that pitch (SysMemPitch) is negative.
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// So we create top-to-bottom DIB.
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memset((void*)aHeader, 0, sizeof(BITMAPV4HEADER));
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aHeader->bV4Size = sizeof(BITMAPV4HEADER);
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aHeader->bV4Width = aWidth;
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aHeader->bV4Height = -LONG(aHeight); // top-to-buttom DIB
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aHeader->bV4Planes = 1;
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aHeader->bV4BitCount = 32;
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aHeader->bV4V4Compression = BI_BITFIELDS;
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aHeader->bV4RedMask = 0x00FF0000;
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aHeader->bV4GreenMask = 0x0000FF00;
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aHeader->bV4BlueMask = 0x000000FF;
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if (aTransparent)
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aHeader->bV4AlphaMask = 0xFF000000;
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return (kHeaderBytes + (-aHeader->bV4Height * aHeader->bV4Width * kBytesPerPixel));
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}
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nsresult
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SharedDIBWin::SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr)
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{
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mSharedHdc = ::CreateCompatibleDC(aHdc);
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if (!mSharedHdc)
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return NS_ERROR_FAILURE;
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mSharedBmp = ::CreateDIBSection(mSharedHdc,
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(BITMAPINFO*)aHdr,
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DIB_RGB_COLORS,
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&mBitmapBits,
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mShMem->handle(),
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kHeaderBytes);
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if (!mSharedBmp)
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return NS_ERROR_FAILURE;
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mOldObj = SelectObject(mSharedHdc, mSharedBmp);
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return NS_OK;
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}
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} // gfx
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} // mozilla
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