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gfx/ipc/SharedDIBWin.cpp@925c144e1f1f (annotated)

gfx/ipc/SharedDIBWin.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Fri, 16 Jan 2015 18:13:44 +0100

branch

TOR_BUG_9701

changeset 14

925c144e1f1f

permissions

-rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

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