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105 lines
4.4 KiB
C++
105 lines
4.4 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) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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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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#ifndef GFX_UTILS_H
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#define GFX_UTILS_H
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#include "gfxTypes.h"
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#include "gfxPattern.h"
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#include "gfxImageSurface.h"
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class gfxDrawable;
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class nsIntRegion;
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class THEBES_API gfxUtils {
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public:
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/*
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* Premultiply or Unpremultiply aSourceSurface, writing the result
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* to aDestSurface or back into aSourceSurface if aDestSurface is null.
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*
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* If aDestSurface is given, it must have identical format, dimensions, and
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* stride as the source.
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*
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* If the source is not ImageFormatARGB32, no operation is performed. If
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* aDestSurface is given, the data is copied over.
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*/
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static void PremultiplyImageSurface(gfxImageSurface *aSourceSurface,
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gfxImageSurface *aDestSurface = nsnull);
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static void UnpremultiplyImageSurface(gfxImageSurface *aSurface,
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gfxImageSurface *aDestSurface = nsnull);
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/**
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* Draw something drawable while working around limitations like bad support
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* for EXTEND_PAD, lack of source-clipping, or cairo / pixman bugs with
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* extreme user-space-to-image-space transforms.
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*
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* The input parameters here usually come from the output of our image
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* snapping algorithm in nsLayoutUtils.cpp.
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* This method is split from nsLayoutUtils::DrawPixelSnapped to allow for
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* adjusting the parameters. For example, certain images with transparent
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* margins only have a drawable subimage. For those images, imgFrame::Draw
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* will tweak the rects and transforms that it gets from the pixel snapping
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* algorithm before passing them on to this method.
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*/
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static void 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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* Clip aContext to the region aRegion.
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*/
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static void ClipToRegion(gfxContext* aContext, const nsIntRegion& aRegion);
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/**
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* Clip aContext to the region aRegion, snapping the rectangles.
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*/
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static void ClipToRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion);
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/*
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* Convert image format to depth value
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*/
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static int ImageFormatToDepth(gfxASurface::gfxImageFormat aFormat);
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};
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#endif
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