зеркало из https://github.com/mozilla/pjs.git
132 строки
4.7 KiB
C++
132 строки
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; 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 gfx thebes 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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* Eric Butler <zantifon@gmail.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 "gfxBlur.h"
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#include "mozilla/gfx/Blur.h"
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using namespace mozilla::gfx;
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gfxAlphaBoxBlur::gfxAlphaBoxBlur()
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: mBlur(nsnull)
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{
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}
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gfxAlphaBoxBlur::~gfxAlphaBoxBlur()
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{
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delete mBlur;
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}
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gfxContext*
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gfxAlphaBoxBlur::Init(const gfxRect& aRect,
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const gfxIntSize& aSpreadRadius,
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const gfxIntSize& aBlurRadius,
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const gfxRect* aDirtyRect,
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const gfxRect* aSkipRect)
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{
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mozilla::gfx::Rect rect(aRect.x, aRect.y, aRect.width, aRect.height);
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IntSize spreadRadius(aSpreadRadius.width, aSpreadRadius.height);
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IntSize blurRadius(aBlurRadius.width, aBlurRadius.height);
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nsAutoPtr<mozilla::gfx::Rect> dirtyRect;
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if (aDirtyRect) {
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dirtyRect = new mozilla::gfx::Rect(aDirtyRect->x, aDirtyRect->y, aDirtyRect->width, aDirtyRect->height);
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}
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nsAutoPtr<mozilla::gfx::Rect> skipRect;
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if (aSkipRect) {
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skipRect = new mozilla::gfx::Rect(aSkipRect->x, aSkipRect->y, aSkipRect->width, aSkipRect->height);
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}
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mBlur = new AlphaBoxBlur(rect, spreadRadius, blurRadius, dirtyRect, skipRect);
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unsigned char* data = mBlur->GetData();
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if (!data)
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return nsnull;
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IntSize size = mBlur->GetSize();
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// Make an alpha-only surface to draw on. We will play with the data after
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// everything is drawn to create a blur effect.
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mImageSurface = new gfxImageSurface(data, gfxIntSize(size.width, size.height),
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mBlur->GetStride(),
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gfxASurface::ImageFormatA8);
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if (mImageSurface->CairoStatus())
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return nsnull;
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IntRect irect = mBlur->GetRect();
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gfxPoint topleft(irect.TopLeft().x, irect.TopLeft().y);
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// Use a device offset so callers don't need to worry about translating
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// coordinates, they can draw as if this was part of the destination context
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// at the coordinates of rect.
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mImageSurface->SetDeviceOffset(-topleft);
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mContext = new gfxContext(mImageSurface);
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return mContext;
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}
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void
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gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx, const gfxPoint& offset)
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{
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if (!mContext)
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return;
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mBlur->Blur();
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mozilla::gfx::Rect* dirtyrect = mBlur->GetDirtyRect();
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// Avoid a semi-expensive clip operation if we can, otherwise
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// clip to the dirty rect
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if (dirtyrect) {
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aDestinationCtx->Save();
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aDestinationCtx->NewPath();
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gfxRect dirty(dirtyrect->x, dirtyrect->y, dirtyrect->width, dirtyrect->height);
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aDestinationCtx->Rectangle(dirty);
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aDestinationCtx->Clip();
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aDestinationCtx->Mask(mImageSurface, offset);
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aDestinationCtx->Restore();
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} else {
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aDestinationCtx->Mask(mImageSurface, offset);
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}
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}
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gfxIntSize gfxAlphaBoxBlur::CalculateBlurRadius(const gfxPoint& aStd)
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{
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mozilla::gfx::Point std(aStd.x, aStd.y);
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IntSize size = AlphaBoxBlur::CalculateBlurRadius(std);
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return gfxIntSize(size.width, size.height);
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}
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