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gfx/ycbcr/YCbCrUtils.cpp@97036ab72558 (annotated)

gfx/ycbcr/YCbCrUtils.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 "gfx2DGlue.h"
michael@0	7
michael@0	8	#include "YCbCrUtils.h"
michael@0	9	#include "yuv_convert.h"
michael@0	10	#include "ycbcr_to_rgb565.h"
michael@0	11
michael@0	12	namespace mozilla {
michael@0	13	namespace gfx {
michael@0	14
michael@0	15	void
michael@0	16	GetYCbCrToRGBDestFormatAndSize(const layers::PlanarYCbCrData& aData,
michael@0	17	SurfaceFormat& aSuggestedFormat,
michael@0	18	IntSize& aSuggestedSize)
michael@0	19	{
michael@0	20	YUVType yuvtype =
michael@0	21	TypeFromSize(aData.mYSize.width,
michael@0	22	aData.mYSize.height,
michael@0	23	aData.mCbCrSize.width,
michael@0	24	aData.mCbCrSize.height);
michael@0	25
michael@0	26	// 'prescale' is true if the scaling is to be done as part of the
michael@0	27	// YCbCr to RGB conversion rather than on the RGB data when rendered.
michael@0	28	bool prescale = aSuggestedSize.width > 0 && aSuggestedSize.height > 0 &&
michael@0	29	aSuggestedSize != aData.mPicSize;
michael@0	30
michael@0	31	if (aSuggestedFormat == SurfaceFormat::R5G6B5) {
michael@0	32	#if defined(HAVE_YCBCR_TO_RGB565)
michael@0	33	if (prescale &&
michael@0	34	!IsScaleYCbCrToRGB565Fast(aData.mPicX,
michael@0	35	aData.mPicY,
michael@0	36	aData.mPicSize.width,
michael@0	37	aData.mPicSize.height,
michael@0	38	aSuggestedSize.width,
michael@0	39	aSuggestedSize.height,
michael@0	40	yuvtype,
michael@0	41	FILTER_BILINEAR) &&
michael@0	42	IsConvertYCbCrToRGB565Fast(aData.mPicX,
michael@0	43	aData.mPicY,
michael@0	44	aData.mPicSize.width,
michael@0	45	aData.mPicSize.height,
michael@0	46	yuvtype)) {
michael@0	47	prescale = false;
michael@0	48	}
michael@0	49	#else
michael@0	50	// yuv2rgb16 function not available
michael@0	51	aSuggestedFormat = SurfaceFormat::B8G8R8X8;
michael@0	52	#endif
michael@0	53	}
michael@0	54	else if (aSuggestedFormat != SurfaceFormat::B8G8R8X8) {
michael@0	55	// No other formats are currently supported.
michael@0	56	aSuggestedFormat = SurfaceFormat::B8G8R8X8;
michael@0	57	}
michael@0	58	if (aSuggestedFormat == SurfaceFormat::B8G8R8X8) {
michael@0	59	/* ScaleYCbCrToRGB32 does not support a picture offset, nor 4:4:4 data.
michael@0	60	See bugs 639415 and 640073. */
michael@0	61	if (aData.mPicX != 0 || aData.mPicY != 0 || yuvtype == YV24)
michael@0	62	prescale = false;
michael@0	63	}
michael@0	64	if (!prescale) {
michael@0	65	aSuggestedSize = aData.mPicSize;
michael@0	66	}
michael@0	67	}
michael@0	68
michael@0	69	void
michael@0	70	ConvertYCbCrToRGB(const layers::PlanarYCbCrData& aData,
michael@0	71	const SurfaceFormat& aDestFormat,
michael@0	72	const IntSize& aDestSize,
michael@0	73	unsigned char* aDestBuffer,
michael@0	74	int32_t aStride)
michael@0	75	{
michael@0	76	// ConvertYCbCrToRGB et al. assume the chroma planes are rounded up if the
michael@0	77	// luma plane is odd sized.
michael@0	78	MOZ_ASSERT((aData.mCbCrSize.width == aData.mYSize.width ||
michael@0	79	aData.mCbCrSize.width == (aData.mYSize.width + 1) >> 1) &&
michael@0	80	(aData.mCbCrSize.height == aData.mYSize.height ||
michael@0	81	aData.mCbCrSize.height == (aData.mYSize.height + 1) >> 1));
michael@0	82	YUVType yuvtype =
michael@0	83	TypeFromSize(aData.mYSize.width,
michael@0	84	aData.mYSize.height,
michael@0	85	aData.mCbCrSize.width,
michael@0	86	aData.mCbCrSize.height);
michael@0	87
michael@0	88	// Convert from YCbCr to RGB now, scaling the image if needed.
michael@0	89	if (aDestSize != aData.mPicSize) {
michael@0	90	#if defined(HAVE_YCBCR_TO_RGB565)
michael@0	91	if (aDestFormat == SurfaceFormat::R5G6B5) {
michael@0	92	ScaleYCbCrToRGB565(aData.mYChannel,
michael@0	93	aData.mCbChannel,
michael@0	94	aData.mCrChannel,
michael@0	95	aDestBuffer,
michael@0	96	aData.mPicX,
michael@0	97	aData.mPicY,
michael@0	98	aData.mPicSize.width,
michael@0	99	aData.mPicSize.height,
michael@0	100	aDestSize.width,
michael@0	101	aDestSize.height,
michael@0	102	aData.mYStride,
michael@0	103	aData.mCbCrStride,
michael@0	104	aStride,
michael@0	105	yuvtype,
michael@0	106	FILTER_BILINEAR);
michael@0	107	} else
michael@0	108	#endif
michael@0	109	ScaleYCbCrToRGB32(aData.mYChannel, //
michael@0	110	aData.mCbChannel,
michael@0	111	aData.mCrChannel,
michael@0	112	aDestBuffer,
michael@0	113	aData.mPicSize.width,
michael@0	114	aData.mPicSize.height,
michael@0	115	aDestSize.width,
michael@0	116	aDestSize.height,
michael@0	117	aData.mYStride,
michael@0	118	aData.mCbCrStride,
michael@0	119	aStride,
michael@0	120	yuvtype,
michael@0	121	ROTATE_0,
michael@0	122	FILTER_BILINEAR);
michael@0	123	} else { // no prescale
michael@0	124	#if defined(HAVE_YCBCR_TO_RGB565)
michael@0	125	if (aDestFormat == SurfaceFormat::R5G6B5) {
michael@0	126	ConvertYCbCrToRGB565(aData.mYChannel,
michael@0	127	aData.mCbChannel,
michael@0	128	aData.mCrChannel,
michael@0	129	aDestBuffer,
michael@0	130	aData.mPicX,
michael@0	131	aData.mPicY,
michael@0	132	aData.mPicSize.width,
michael@0	133	aData.mPicSize.height,
michael@0	134	aData.mYStride,
michael@0	135	aData.mCbCrStride,
michael@0	136	aStride,
michael@0	137	yuvtype);
michael@0	138	} else // aDestFormat != gfxImageFormat::RGB16_565
michael@0	139	#endif
michael@0	140	ConvertYCbCrToRGB32(aData.mYChannel, //
michael@0	141	aData.mCbChannel,
michael@0	142	aData.mCrChannel,
michael@0	143	aDestBuffer,
michael@0	144	aData.mPicX,
michael@0	145	aData.mPicY,
michael@0	146	aData.mPicSize.width,
michael@0	147	aData.mPicSize.height,
michael@0	148	aData.mYStride,
michael@0	149	aData.mCbCrStride,
michael@0	150	aStride,
michael@0	151	yuvtype);
michael@0	152	}
michael@0	153	}
michael@0	154
michael@0	155	}
michael@0	156	}