зеркало из https://github.com/mozilla/gecko-dev.git
461 строка
16 KiB
C++
461 строка
16 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "gfxUtils.h"
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#include "gfxContext.h"
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#include "gfxPlatform.h"
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#include "gfxDrawable.h"
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#include "nsRegion.h"
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#if defined(XP_WIN) || defined(WINCE)
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#include "gfxWindowsPlatform.h"
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#endif
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static PRUint8 sUnpremultiplyTable[256*256];
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static PRUint8 sPremultiplyTable[256*256];
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static PRBool sTablesInitialized = PR_FALSE;
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static const PRUint8 PremultiplyValue(PRUint8 a, PRUint8 v) {
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return sPremultiplyTable[a*256+v];
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}
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static const PRUint8 UnpremultiplyValue(PRUint8 a, PRUint8 v) {
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return sUnpremultiplyTable[a*256+v];
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}
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static void
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CalculateTables()
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{
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// It's important that the array be indexed first by alpha and then by rgb
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// value. When we unpremultiply a pixel, we're guaranteed to do three
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// lookups with the same alpha; indexing by alpha first makes it likely that
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// those three lookups will be close to one another in memory, thus
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// increasing the chance of a cache hit.
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// Unpremultiply table
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// a == 0 case
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for (PRUint32 c = 0; c <= 255; c++) {
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sUnpremultiplyTable[c] = c;
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}
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for (int a = 1; a <= 255; a++) {
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for (int c = 0; c <= 255; c++) {
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sUnpremultiplyTable[a*256+c] = (PRUint8)((c * 255) / a);
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}
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}
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// Premultiply table
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for (int a = 0; a <= 255; a++) {
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for (int c = 0; c <= 255; c++) {
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sPremultiplyTable[a*256+c] = (a * c + 254) / 255;
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}
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}
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sTablesInitialized = PR_TRUE;
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}
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void
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gfxUtils::PremultiplyImageSurface(gfxImageSurface *aSourceSurface,
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gfxImageSurface *aDestSurface)
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{
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if (!aDestSurface)
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aDestSurface = aSourceSurface;
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NS_ASSERTION(aSourceSurface->Format() == aDestSurface->Format() &&
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aSourceSurface->Width() == aDestSurface->Width() &&
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aSourceSurface->Height() == aDestSurface->Height() &&
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aSourceSurface->Stride() == aDestSurface->Stride(),
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"Source and destination surfaces don't have identical characteristics");
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NS_ASSERTION(aSourceSurface->Stride() == aSourceSurface->Width() * 4,
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"Source surface stride isn't tightly packed");
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// Only premultiply ARGB32
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if (aSourceSurface->Format() != gfxASurface::ImageFormatARGB32) {
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if (aDestSurface != aSourceSurface) {
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memcpy(aDestSurface->Data(), aSourceSurface->Data(),
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aSourceSurface->Stride() * aSourceSurface->Height());
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}
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return;
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}
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if (!sTablesInitialized)
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CalculateTables();
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PRUint8 *src = aSourceSurface->Data();
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PRUint8 *dst = aDestSurface->Data();
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PRUint32 dim = aSourceSurface->Width() * aSourceSurface->Height();
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for (PRUint32 i = 0; i < dim; ++i) {
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#ifdef IS_LITTLE_ENDIAN
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PRUint8 b = *src++;
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PRUint8 g = *src++;
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PRUint8 r = *src++;
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PRUint8 a = *src++;
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*dst++ = PremultiplyValue(a, b);
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*dst++ = PremultiplyValue(a, g);
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*dst++ = PremultiplyValue(a, r);
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*dst++ = a;
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#else
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PRUint8 a = *src++;
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PRUint8 r = *src++;
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PRUint8 g = *src++;
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PRUint8 b = *src++;
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*dst++ = a;
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*dst++ = PremultiplyValue(a, r);
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*dst++ = PremultiplyValue(a, g);
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*dst++ = PremultiplyValue(a, b);
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#endif
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}
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}
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void
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gfxUtils::UnpremultiplyImageSurface(gfxImageSurface *aSourceSurface,
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gfxImageSurface *aDestSurface)
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{
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if (!aDestSurface)
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aDestSurface = aSourceSurface;
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NS_ASSERTION(aSourceSurface->Format() == aDestSurface->Format() &&
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aSourceSurface->Width() == aDestSurface->Width() &&
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aSourceSurface->Height() == aDestSurface->Height() &&
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aSourceSurface->Stride() == aDestSurface->Stride(),
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"Source and destination surfaces don't have identical characteristics");
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NS_ASSERTION(aSourceSurface->Stride() == aSourceSurface->Width() * 4,
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"Source surface stride isn't tightly packed");
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// Only premultiply ARGB32
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if (aSourceSurface->Format() != gfxASurface::ImageFormatARGB32) {
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if (aDestSurface != aSourceSurface) {
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memcpy(aDestSurface->Data(), aSourceSurface->Data(),
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aSourceSurface->Stride() * aSourceSurface->Height());
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}
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return;
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}
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if (!sTablesInitialized)
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CalculateTables();
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PRUint8 *src = aSourceSurface->Data();
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PRUint8 *dst = aDestSurface->Data();
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PRUint32 dim = aSourceSurface->Width() * aSourceSurface->Height();
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for (PRUint32 i = 0; i < dim; ++i) {
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#ifdef IS_LITTLE_ENDIAN
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PRUint8 b = *src++;
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PRUint8 g = *src++;
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PRUint8 r = *src++;
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PRUint8 a = *src++;
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*dst++ = UnpremultiplyValue(a, b);
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*dst++ = UnpremultiplyValue(a, g);
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*dst++ = UnpremultiplyValue(a, r);
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*dst++ = a;
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#else
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PRUint8 a = *src++;
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PRUint8 r = *src++;
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PRUint8 g = *src++;
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PRUint8 b = *src++;
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*dst++ = a;
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*dst++ = UnpremultiplyValue(a, r);
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*dst++ = UnpremultiplyValue(a, g);
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*dst++ = UnpremultiplyValue(a, b);
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#endif
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}
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}
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static PRBool
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IsSafeImageTransformComponent(gfxFloat aValue)
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{
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return aValue >= -32768 && aValue <= 32767;
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}
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/**
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* This returns the fastest operator to use for solid surfaces which have no
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* alpha channel or their alpha channel is uniformly opaque.
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* This differs per render mode.
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*/
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static gfxContext::GraphicsOperator
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OptimalFillOperator()
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{
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#ifdef XP_WIN
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if (gfxWindowsPlatform::GetPlatform()->GetRenderMode() ==
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gfxWindowsPlatform::RENDER_DIRECT2D) {
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// D2D -really- hates operator source.
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return gfxContext::OPERATOR_OVER;
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} else {
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#endif
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return gfxContext::OPERATOR_SOURCE;
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#ifdef XP_WIN
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}
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#endif
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}
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// EXTEND_PAD won't help us here; we have to create a temporary surface to hold
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// the subimage of pixels we're allowed to sample.
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static already_AddRefed<gfxDrawable>
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CreateSamplingRestrictedDrawable(gfxDrawable* aDrawable,
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gfxContext* aContext,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aSourceRect,
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const gfxRect& aSubimage,
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const gfxImageSurface::gfxImageFormat aFormat)
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{
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gfxRect userSpaceClipExtents = aContext->GetClipExtents();
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// This isn't optimal --- if aContext has a rotation then GetClipExtents
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// will have to do a bounding-box computation, and TransformBounds might
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// too, so we could get a better result if we computed image space clip
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// extents in one go --- but it doesn't really matter and this is easier
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// to understand.
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gfxRect imageSpaceClipExtents =
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aUserSpaceToImageSpace.TransformBounds(userSpaceClipExtents);
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// Inflate by one pixel because bilinear filtering will sample at most
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// one pixel beyond the computed image pixel coordinate.
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imageSpaceClipExtents.Outset(1.0);
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gfxRect needed = imageSpaceClipExtents.Intersect(aSourceRect);
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needed = needed.Intersect(aSubimage);
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needed.RoundOut();
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// if 'needed' is empty, nothing will be drawn since aFill
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// must be entirely outside the clip region, so it doesn't
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// matter what we do here, but we should avoid trying to
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// create a zero-size surface.
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if (needed.IsEmpty())
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return nsnull;
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gfxIntSize size(PRInt32(needed.Width()), PRInt32(needed.Height()));
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nsRefPtr<gfxASurface> temp =
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gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxASurface::ContentFromFormat(aFormat));
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if (!temp || temp->CairoStatus())
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return nsnull;
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nsRefPtr<gfxContext> tmpCtx = new gfxContext(temp);
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tmpCtx->SetOperator(OptimalFillOperator());
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aDrawable->Draw(tmpCtx, needed - needed.pos, PR_TRUE,
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gfxPattern::FILTER_FAST, gfxMatrix().Translate(needed.pos));
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nsRefPtr<gfxPattern> resultPattern = new gfxPattern(temp);
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if (!resultPattern)
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return nsnull;
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nsRefPtr<gfxDrawable> drawable =
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new gfxSurfaceDrawable(temp, size, gfxMatrix().Translate(-needed.pos));
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return drawable.forget();
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}
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// working around cairo/pixman bug (bug 364968)
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// Our device-space-to-image-space transform may not be acceptable to pixman.
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struct NS_STACK_CLASS AutoCairoPixmanBugWorkaround
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{
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AutoCairoPixmanBugWorkaround(gfxContext* aContext,
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const gfxMatrix& aDeviceSpaceToImageSpace,
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const gfxRect& aFill,
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const gfxASurface::gfxSurfaceType& aSurfaceType)
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: mContext(aContext), mSucceeded(PR_TRUE), mPushedGroup(PR_FALSE)
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{
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// Quartz's limits for matrix are much larger than pixman
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if (aSurfaceType == gfxASurface::SurfaceTypeQuartz)
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return;
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if (!IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.xx) ||
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!IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.xy) ||
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!IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.yx) ||
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!IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.yy)) {
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NS_WARNING("Scaling up too much, bailing out");
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mSucceeded = PR_FALSE;
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return;
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}
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if (IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.x0) &&
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IsSafeImageTransformComponent(aDeviceSpaceToImageSpace.y0))
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return;
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// We'll push a group, which will hopefully reduce our transform's
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// translation so it's in bounds.
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gfxMatrix currentMatrix = mContext->CurrentMatrix();
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mContext->Save();
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// Clip the rounded-out-to-device-pixels bounds of the
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// transformed fill area. This is the area for the group we
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// want to push.
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mContext->IdentityMatrix();
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gfxRect bounds = currentMatrix.TransformBounds(aFill);
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bounds.RoundOut();
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mContext->Clip(bounds);
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mContext->SetMatrix(currentMatrix);
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mContext->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
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mContext->SetOperator(gfxContext::OPERATOR_OVER);
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mPushedGroup = PR_TRUE;
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}
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~AutoCairoPixmanBugWorkaround()
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{
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if (mPushedGroup) {
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mContext->PopGroupToSource();
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mContext->Paint();
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mContext->Restore();
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}
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}
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PRBool PushedGroup() { return mPushedGroup; }
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PRBool Succeeded() { return mSucceeded; }
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private:
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gfxContext* mContext;
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PRPackedBool mSucceeded;
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PRPackedBool mPushedGroup;
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};
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static gfxMatrix
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DeviceToImageTransform(gfxContext* aContext,
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const gfxMatrix& aUserSpaceToImageSpace)
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{
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gfxFloat deviceX, deviceY;
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nsRefPtr<gfxASurface> currentTarget =
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aContext->CurrentSurface(&deviceX, &deviceY);
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gfxMatrix currentMatrix = aContext->CurrentMatrix();
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gfxMatrix deviceToUser = gfxMatrix(currentMatrix).Invert();
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deviceToUser.Translate(-gfxPoint(-deviceX, -deviceY));
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return gfxMatrix(deviceToUser).Multiply(aUserSpaceToImageSpace);
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}
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/* static */ void
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gfxUtils::DrawPixelSnapped(gfxContext* aContext,
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gfxDrawable* aDrawable,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aSubimage,
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const gfxRect& aSourceRect,
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const gfxRect& aImageRect,
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const gfxRect& aFill,
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const gfxImageSurface::gfxImageFormat aFormat,
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const gfxPattern::GraphicsFilter& aFilter)
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{
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PRBool doTile = !aImageRect.Contains(aSourceRect);
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nsRefPtr<gfxASurface> currentTarget = aContext->CurrentSurface();
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gfxASurface::gfxSurfaceType surfaceType = currentTarget->GetType();
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gfxMatrix deviceSpaceToImageSpace =
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DeviceToImageTransform(aContext, aUserSpaceToImageSpace);
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AutoCairoPixmanBugWorkaround workaround(aContext, deviceSpaceToImageSpace,
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aFill, surfaceType);
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if (!workaround.Succeeded())
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return;
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nsRefPtr<gfxDrawable> drawable = aDrawable;
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// OK now, the hard part left is to account for the subimage sampling
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// restriction. If all the transforms involved are just integer
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// translations, then we assume no resampling will occur so there's
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// nothing to do.
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// XXX if only we had source-clipping in cairo!
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if (aContext->CurrentMatrix().HasNonIntegerTranslation() ||
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aUserSpaceToImageSpace.HasNonIntegerTranslation()) {
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if (doTile || !aSubimage.Contains(aImageRect)) {
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nsRefPtr<gfxDrawable> restrictedDrawable =
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CreateSamplingRestrictedDrawable(aDrawable, aContext,
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aUserSpaceToImageSpace, aSourceRect,
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aSubimage, aFormat);
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if (restrictedDrawable) {
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drawable.swap(restrictedDrawable);
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}
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}
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// We no longer need to tile: Either we never needed to, or we already
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// filled a surface with the tiled pattern; this surface can now be
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// drawn without tiling.
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doTile = PR_FALSE;
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}
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gfxContext::GraphicsOperator op = aContext->CurrentOperator();
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if ((op == gfxContext::OPERATOR_OVER || workaround.PushedGroup()) &&
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aFormat == gfxASurface::ImageFormatRGB24) {
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aContext->SetOperator(OptimalFillOperator());
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}
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drawable->Draw(aContext, aFill, doTile, aFilter, aUserSpaceToImageSpace);
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aContext->SetOperator(op);
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}
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/* static */ int
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gfxUtils::ImageFormatToDepth(gfxASurface::gfxImageFormat aFormat)
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{
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switch (aFormat) {
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case gfxASurface::ImageFormatARGB32:
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return 32;
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case gfxASurface::ImageFormatRGB24:
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return 24;
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case gfxASurface::ImageFormatRGB16_565:
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return 16;
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default:
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break;
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}
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return 0;
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}
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static void
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ClipToRegionInternal(gfxContext* aContext, const nsIntRegion& aRegion,
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PRBool aSnap)
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{
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aContext->NewPath();
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nsIntRegionRectIterator iter(aRegion);
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const nsIntRect* r;
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while ((r = iter.Next()) != nsnull) {
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aContext->Rectangle(gfxRect(r->x, r->y, r->width, r->height), aSnap);
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}
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aContext->Clip();
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}
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/*static*/ void
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gfxUtils::ClipToRegion(gfxContext* aContext, const nsIntRegion& aRegion)
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{
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ClipToRegionInternal(aContext, aRegion, PR_FALSE);
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}
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/*static*/ void
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gfxUtils::ClipToRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion)
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{
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ClipToRegionInternal(aContext, aRegion, PR_TRUE);
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}
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