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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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** WARNING:
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** A separate license from Unisys may be required to use the gif
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** reader. See http://www.unisys.com/about__unisys/lzw/
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** for information from Unisys
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**
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****************************************************************************/
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#include "qgifhandler.h"
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#include <qimage.h>
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#include <qiodevice.h>
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#include <qvariant.h>
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QT_BEGIN_NAMESPACE
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#define Q_TRANSPARENT 0x00ffffff
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/*
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Incremental image decoder for GIF image format.
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This subclass of QImageFormat decodes GIF format images,
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including animated GIFs. Internally in
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*/
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class QGIFFormat {
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public:
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QGIFFormat();
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~QGIFFormat();
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int decode(QImage *image, const uchar* buffer, int length,
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int *nextFrameDelay, int *loopCount, QSize *nextSize);
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bool newFrame;
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bool partialNewFrame;
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private:
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void fillRect(QImage *image, int x, int y, int w, int h, QRgb col);
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inline QRgb color(uchar index) const;
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// GIF specific stuff
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QRgb* globalcmap;
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QRgb* localcmap;
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QImage backingstore;
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unsigned char hold[16];
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bool gif89;
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int count;
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int ccount;
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int expectcount;
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enum State {
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Header,
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LogicalScreenDescriptor,
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GlobalColorMap,
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LocalColorMap,
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Introducer,
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ImageDescriptor,
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TableImageLZWSize,
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ImageDataBlockSize,
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ImageDataBlock,
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ExtensionLabel,
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GraphicControlExtension,
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ApplicationExtension,
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NetscapeExtensionBlockSize,
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NetscapeExtensionBlock,
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SkipBlockSize,
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SkipBlock,
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Done,
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Error
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} state;
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int gncols;
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int lncols;
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int ncols;
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int lzwsize;
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bool lcmap;
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int swidth, sheight;
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int width, height;
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int left, top, right, bottom;
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enum Disposal { NoDisposal, DoNotChange, RestoreBackground, RestoreImage };
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Disposal disposal;
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bool disposed;
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int trans_index;
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bool gcmap;
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int bgcol;
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int interlace;
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int accum;
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int bitcount;
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enum { max_lzw_bits=12 }; // (poor-compiler's static const int)
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int code_size, clear_code, end_code, max_code_size, max_code;
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int firstcode, oldcode, incode;
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short table[2][1<< max_lzw_bits];
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short stack[(1<<(max_lzw_bits))*2];
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short *sp;
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bool needfirst;
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int x, y;
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int frame;
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bool out_of_bounds;
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bool digress;
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void nextY(QImage *image);
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void disposePrevious(QImage *image);
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};
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/*!
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Constructs a QGIFFormat.
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*/
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QGIFFormat::QGIFFormat()
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{
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globalcmap = 0;
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localcmap = 0;
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lncols = 0;
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gncols = 0;
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disposal = NoDisposal;
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out_of_bounds = false;
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disposed = true;
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frame = -1;
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state = Header;
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count = 0;
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lcmap = false;
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newFrame = false;
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partialNewFrame = false;
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}
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/*!
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Destroys a QGIFFormat.
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*/
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QGIFFormat::~QGIFFormat()
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{
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if (globalcmap) delete[] globalcmap;
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if (localcmap) delete[] localcmap;
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}
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void QGIFFormat::disposePrevious(QImage *image)
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{
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if (out_of_bounds) {
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// flush anything that survived
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// ### Changed: QRect(0, 0, swidth, sheight)
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}
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// Handle disposal of previous image before processing next one
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if (disposed) return;
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int l = qMin(swidth-1,left);
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int r = qMin(swidth-1,right);
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int t = qMin(sheight-1,top);
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int b = qMin(sheight-1,bottom);
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switch (disposal) {
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case NoDisposal:
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break;
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case DoNotChange:
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break;
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case RestoreBackground:
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if (trans_index>=0) {
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// Easy: we use the transparent color
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fillRect(image, l, t, r-l+1, b-t+1, Q_TRANSPARENT);
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} else if (bgcol>=0) {
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// Easy: we use the bgcol given
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fillRect(image, l, t, r-l+1, b-t+1, color(bgcol));
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} else {
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// Impossible: We don't know of a bgcol - use pixel 0
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QRgb *bits = (QRgb*)image->bits();
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fillRect(image, l, t, r-l+1, b-t+1, bits[0]);
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}
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// ### Changed: QRect(l, t, r-l+1, b-t+1)
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break;
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case RestoreImage: {
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if (frame >= 0) {
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for (int ln=t; ln<=b; ln++) {
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memcpy(image->scanLine(ln)+l,
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backingstore.scanLine(ln-t),
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(r-l+1)*sizeof(QRgb));
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}
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// ### Changed: QRect(l, t, r-l+1, b-t+1)
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}
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}
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}
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disposal = NoDisposal; // Until an extension says otherwise.
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disposed = true;
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}
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/*!
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This function decodes some data into image changes.
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Returns the number of bytes consumed.
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*/
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int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
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int *nextFrameDelay, int *loopCount, QSize *nextSize)
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{
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// We are required to state that
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// "The Graphics Interchange Format(c) is the Copyright property of
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// CompuServe Incorporated. GIF(sm) is a Service Mark property of
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// CompuServe Incorporated."
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#define LM(l, m) (((m)<<8)|l)
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digress = false;
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const int initial = length;
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while (!digress && length) {
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length--;
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unsigned char ch=*buffer++;
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switch (state) {
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case Header:
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hold[count++]=ch;
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if (count==6) {
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// Header
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gif89=(hold[3]!='8' || hold[4]!='7');
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state=LogicalScreenDescriptor;
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count=0;
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}
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break;
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case LogicalScreenDescriptor:
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hold[count++]=ch;
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if (count==7) {
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// Logical Screen Descriptor
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swidth=LM(hold[0], hold[1]);
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sheight=LM(hold[2], hold[3]);
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gcmap=!!(hold[4]&0x80);
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//UNUSED: bpchan=(((hold[4]&0x70)>>3)+1);
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//UNUSED: gcmsortflag=!!(hold[4]&0x08);
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gncols=2<<(hold[4]&0x7);
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bgcol=(gcmap) ? hold[5] : -1;
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//aspect=hold[6] ? double(hold[6]+15)/64.0 : 1.0;
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trans_index = -1;
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count=0;
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ncols=gncols;
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if (gcmap) {
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ccount=0;
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state=GlobalColorMap;
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globalcmap = new QRgb[gncols+1]; // +1 for trans_index
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globalcmap[gncols] = Q_TRANSPARENT;
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} else {
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state=Introducer;
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}
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}
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break;
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case GlobalColorMap: case LocalColorMap:
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hold[count++]=ch;
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if (count==3) {
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QRgb rgb = qRgb(hold[0], hold[1], hold[2]);
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if (state == LocalColorMap) {
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if (ccount < lncols)
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localcmap[ccount] = rgb;
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} else {
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globalcmap[ccount] = rgb;
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}
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if (++ccount >= ncols) {
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if (state == LocalColorMap)
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state=TableImageLZWSize;
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else
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state=Introducer;
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}
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count=0;
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}
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break;
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case Introducer:
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hold[count++]=ch;
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switch (ch) {
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case ',':
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state=ImageDescriptor;
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break;
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case '!':
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state=ExtensionLabel;
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break;
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case ';':
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// ### Changed: QRect(0, 0, swidth, sheight)
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state=Done;
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break;
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default:
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digress=true;
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// Unexpected Introducer - ignore block
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state=Error;
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}
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break;
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case ImageDescriptor:
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hold[count++]=ch;
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if (count==10) {
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int newleft=LM(hold[1], hold[2]);
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int newtop=LM(hold[3], hold[4]);
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int newwidth=LM(hold[5], hold[6]);
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int newheight=LM(hold[7], hold[8]);
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// disbelieve ridiculous logical screen sizes,
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// unless the image frames are also large.
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if (swidth/10 > qMax(newwidth,200))
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swidth = -1;
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if (sheight/10 > qMax(newheight,200))
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sheight = -1;
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if (swidth <= 0)
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swidth = newleft + newwidth;
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if (sheight <= 0)
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sheight = newtop + newheight;
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QImage::Format format = trans_index >= 0 ? QImage::Format_ARGB32 : QImage::Format_RGB32;
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if (image->isNull()) {
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(*image) = QImage(swidth, sheight, format);
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memset(image->bits(), 0, image->numBytes());
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// ### size of the upcoming frame, should rather
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// be known before decoding it.
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*nextSize = QSize(swidth, sheight);
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}
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disposePrevious(image);
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disposed = false;
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left = newleft;
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top = newtop;
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width = newwidth;
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height = newheight;
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right=qMax(0, qMin(left+width, swidth)-1);
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bottom=qMax(0, qMin(top+height, sheight)-1);
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lcmap=!!(hold[9]&0x80);
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interlace=!!(hold[9]&0x40);
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//bool lcmsortflag=!!(hold[9]&0x20);
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lncols=lcmap ? (2<<(hold[9]&0x7)) : 0;
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if (lncols) {
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if (localcmap)
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delete [] localcmap;
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localcmap = new QRgb[lncols+1];
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localcmap[lncols] = Q_TRANSPARENT;
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ncols = lncols;
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} else {
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ncols = gncols;
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}
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frame++;
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if (frame == 0) {
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if (left || top || width<swidth || height<sheight) {
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// Not full-size image - erase with bg or transparent
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if (trans_index >= 0) {
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fillRect(image, 0, 0, swidth, sheight, color(trans_index));
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// ### Changed: QRect(0, 0, swidth, sheight)
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} else if (bgcol>=0) {
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fillRect(image, 0, 0, swidth, sheight, color(bgcol));
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// ### Changed: QRect(0, 0, swidth, sheight)
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}
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}
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}
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if (disposal == RestoreImage) {
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int l = qMin(swidth-1,left);
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int r = qMin(swidth-1,right);
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int t = qMin(sheight-1,top);
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int b = qMin(sheight-1,bottom);
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int w = r-l+1;
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int h = b-t+1;
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389 |
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390 |
if (backingstore.width() < w
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|| backingstore.height() < h) {
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// We just use the backing store as a byte array
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backingstore = QImage(qMax(backingstore.width(), w),
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qMax(backingstore.height(), h),
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QImage::Format_RGB32);
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memset(image->bits(), 0, image->numBytes());
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}
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for (int ln=0; ln<h; ln++) {
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memcpy(backingstore.scanLine(ln),
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image->scanLine(t+ln)+l, w*sizeof(QRgb));
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401 |
}
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402 |
}
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403 |
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count=0;
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405 |
if (lcmap) {
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406 |
ccount=0;
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407 |
state=LocalColorMap;
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408 |
} else {
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|
409 |
state=TableImageLZWSize;
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410 |
}
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411 |
x = left;
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|
412 |
y = top;
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|
413 |
accum = 0;
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|
414 |
bitcount = 0;
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415 |
sp = stack;
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416 |
firstcode = oldcode = 0;
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417 |
needfirst = true;
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418 |
out_of_bounds = left>=swidth || y>=sheight;
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|
419 |
}
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|
420 |
break;
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|
421 |
case TableImageLZWSize: {
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422 |
lzwsize=ch;
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|
423 |
if (lzwsize > max_lzw_bits) {
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|
424 |
state=Error;
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|
425 |
} else {
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|
426 |
code_size=lzwsize+1;
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|
427 |
clear_code=1<<lzwsize;
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|
428 |
end_code=clear_code+1;
|
|
429 |
max_code_size=2*clear_code;
|
|
430 |
max_code=clear_code+2;
|
|
431 |
int i;
|
|
432 |
for (i=0; i<clear_code; i++) {
|
|
433 |
table[0][i]=0;
|
|
434 |
table[1][i]=i;
|
|
435 |
}
|
|
436 |
state=ImageDataBlockSize;
|
|
437 |
}
|
|
438 |
count=0;
|
|
439 |
break;
|
|
440 |
} case ImageDataBlockSize:
|
|
441 |
expectcount=ch;
|
|
442 |
if (expectcount) {
|
|
443 |
state=ImageDataBlock;
|
|
444 |
} else {
|
|
445 |
state=Introducer;
|
|
446 |
digress = true;
|
|
447 |
newFrame = true;
|
|
448 |
}
|
|
449 |
break;
|
|
450 |
case ImageDataBlock:
|
|
451 |
count++;
|
|
452 |
accum|=(ch<<bitcount);
|
|
453 |
bitcount+=8;
|
|
454 |
while (bitcount>=code_size && state==ImageDataBlock) {
|
|
455 |
int code=accum&((1<<code_size)-1);
|
|
456 |
bitcount-=code_size;
|
|
457 |
accum>>=code_size;
|
|
458 |
|
|
459 |
if (code==clear_code) {
|
|
460 |
if (!needfirst) {
|
|
461 |
code_size=lzwsize+1;
|
|
462 |
max_code_size=2*clear_code;
|
|
463 |
max_code=clear_code+2;
|
|
464 |
}
|
|
465 |
needfirst=true;
|
|
466 |
} else if (code==end_code) {
|
|
467 |
bitcount = -32768;
|
|
468 |
// Left the block end arrive
|
|
469 |
} else {
|
|
470 |
if (needfirst) {
|
|
471 |
firstcode=oldcode=code;
|
|
472 |
if (!out_of_bounds && image->height() > y && firstcode!=trans_index)
|
|
473 |
((QRgb*)image->scanLine(y))[x] = color(firstcode);
|
|
474 |
x++;
|
|
475 |
if (x>=swidth) out_of_bounds = true;
|
|
476 |
needfirst=false;
|
|
477 |
if (x>=left+width) {
|
|
478 |
x=left;
|
|
479 |
out_of_bounds = left>=swidth || y>=sheight;
|
|
480 |
nextY(image);
|
|
481 |
}
|
|
482 |
} else {
|
|
483 |
incode=code;
|
|
484 |
if (code>=max_code) {
|
|
485 |
*sp++=firstcode;
|
|
486 |
code=oldcode;
|
|
487 |
}
|
|
488 |
while (code>=clear_code+2) {
|
|
489 |
*sp++=table[1][code];
|
|
490 |
if (code==table[0][code]) {
|
|
491 |
state=Error;
|
|
492 |
break;
|
|
493 |
}
|
|
494 |
if (sp-stack>=(1<<(max_lzw_bits))*2) {
|
|
495 |
state=Error;
|
|
496 |
break;
|
|
497 |
}
|
|
498 |
code=table[0][code];
|
|
499 |
}
|
|
500 |
*sp++=firstcode=table[1][code];
|
|
501 |
code=max_code;
|
|
502 |
if (code<(1<<max_lzw_bits)) {
|
|
503 |
table[0][code]=oldcode;
|
|
504 |
table[1][code]=firstcode;
|
|
505 |
max_code++;
|
|
506 |
if ((max_code>=max_code_size)
|
|
507 |
&& (max_code_size<(1<<max_lzw_bits)))
|
|
508 |
{
|
|
509 |
max_code_size*=2;
|
|
510 |
code_size++;
|
|
511 |
}
|
|
512 |
}
|
|
513 |
oldcode=incode;
|
|
514 |
const int h = image->height();
|
|
515 |
const QRgb *map = lcmap ? localcmap : globalcmap;
|
|
516 |
QRgb *line = 0;
|
|
517 |
if (!out_of_bounds && h > y)
|
|
518 |
line = (QRgb*)image->scanLine(y);
|
|
519 |
while (sp>stack) {
|
|
520 |
const uchar index = *(--sp);
|
|
521 |
if (!out_of_bounds && h > y && index!=trans_index) {
|
|
522 |
if (index > ncols)
|
|
523 |
line[x] = Q_TRANSPARENT;
|
|
524 |
else
|
|
525 |
line[x] = map ? map[index] : 0;
|
|
526 |
}
|
|
527 |
x++;
|
|
528 |
if (x>=swidth) out_of_bounds = true;
|
|
529 |
if (x>=left+width) {
|
|
530 |
x=left;
|
|
531 |
out_of_bounds = left>=swidth || y>=sheight;
|
|
532 |
nextY(image);
|
|
533 |
if (!out_of_bounds && h > y)
|
|
534 |
line = (QRgb*)image->scanLine(y);
|
|
535 |
}
|
|
536 |
}
|
|
537 |
}
|
|
538 |
}
|
|
539 |
}
|
|
540 |
partialNewFrame = true;
|
|
541 |
if (count==expectcount) {
|
|
542 |
count=0;
|
|
543 |
state=ImageDataBlockSize;
|
|
544 |
}
|
|
545 |
break;
|
|
546 |
case ExtensionLabel:
|
|
547 |
switch (ch) {
|
|
548 |
case 0xf9:
|
|
549 |
state=GraphicControlExtension;
|
|
550 |
break;
|
|
551 |
case 0xff:
|
|
552 |
state=ApplicationExtension;
|
|
553 |
break;
|
|
554 |
#if 0
|
|
555 |
case 0xfe:
|
|
556 |
state=CommentExtension;
|
|
557 |
break;
|
|
558 |
case 0x01:
|
|
559 |
break;
|
|
560 |
#endif
|
|
561 |
default:
|
|
562 |
state=SkipBlockSize;
|
|
563 |
}
|
|
564 |
count=0;
|
|
565 |
break;
|
|
566 |
case ApplicationExtension:
|
|
567 |
if (count<11) hold[count]=ch;
|
|
568 |
count++;
|
|
569 |
if (count==hold[0]+1) {
|
|
570 |
if (qstrncmp((char*)(hold+1), "NETSCAPE", 8)==0) {
|
|
571 |
// Looping extension
|
|
572 |
state=NetscapeExtensionBlockSize;
|
|
573 |
} else {
|
|
574 |
state=SkipBlockSize;
|
|
575 |
}
|
|
576 |
count=0;
|
|
577 |
}
|
|
578 |
break;
|
|
579 |
case NetscapeExtensionBlockSize:
|
|
580 |
expectcount=ch;
|
|
581 |
count=0;
|
|
582 |
if (expectcount) state=NetscapeExtensionBlock;
|
|
583 |
else state=Introducer;
|
|
584 |
break;
|
|
585 |
case NetscapeExtensionBlock:
|
|
586 |
if (count<3) hold[count]=ch;
|
|
587 |
count++;
|
|
588 |
if (count==expectcount) {
|
|
589 |
*loopCount = hold[1]+hold[2]*256;
|
|
590 |
state=SkipBlockSize; // Ignore further blocks
|
|
591 |
}
|
|
592 |
break;
|
|
593 |
case GraphicControlExtension:
|
|
594 |
if (count<5) hold[count]=ch;
|
|
595 |
count++;
|
|
596 |
if (count==hold[0]+1) {
|
|
597 |
disposePrevious(image);
|
|
598 |
disposal=Disposal((hold[1]>>2)&0x7);
|
|
599 |
//UNUSED: waitforuser=!!((hold[1]>>1)&0x1);
|
|
600 |
int delay=count>3 ? LM(hold[2], hold[3]) : 1;
|
|
601 |
// IE and mozilla use a minimum delay of 10. With the minimum delay of 10
|
|
602 |
// we are compatible to them and avoid huge loads on the app and xserver.
|
|
603 |
*nextFrameDelay = (delay < 2 ? 10 : delay) * 10;
|
|
604 |
|
|
605 |
bool havetrans=hold[1]&0x1;
|
|
606 |
trans_index = havetrans ? hold[4] : -1;
|
|
607 |
|
|
608 |
count=0;
|
|
609 |
state=SkipBlockSize;
|
|
610 |
}
|
|
611 |
break;
|
|
612 |
case SkipBlockSize:
|
|
613 |
expectcount=ch;
|
|
614 |
count=0;
|
|
615 |
if (expectcount) state=SkipBlock;
|
|
616 |
else state=Introducer;
|
|
617 |
break;
|
|
618 |
case SkipBlock:
|
|
619 |
count++;
|
|
620 |
if (count==expectcount) state=SkipBlockSize;
|
|
621 |
break;
|
|
622 |
case Done:
|
|
623 |
digress=true;
|
|
624 |
/* Netscape ignores the junk, so we do too.
|
|
625 |
length++; // Unget
|
|
626 |
state=Error; // More calls to this is an error
|
|
627 |
*/
|
|
628 |
break;
|
|
629 |
case Error:
|
|
630 |
return -1; // Called again after done.
|
|
631 |
}
|
|
632 |
}
|
|
633 |
return initial-length;
|
|
634 |
}
|
|
635 |
|
|
636 |
void QGIFFormat::fillRect(QImage *image, int col, int row, int w, int h, QRgb color)
|
|
637 |
{
|
|
638 |
if (w>0) {
|
|
639 |
for (int j=0; j<h; j++) {
|
|
640 |
QRgb *line = (QRgb*)image->scanLine(j+row);
|
|
641 |
for (int i=0; i<w; i++)
|
|
642 |
*(line+col+i) = color;
|
|
643 |
}
|
|
644 |
}
|
|
645 |
}
|
|
646 |
|
|
647 |
void QGIFFormat::nextY(QImage *image)
|
|
648 |
{
|
|
649 |
int my;
|
|
650 |
switch (interlace) {
|
|
651 |
case 0: // Non-interlaced
|
|
652 |
// if (!out_of_bounds) {
|
|
653 |
// ### Changed: QRect(left, y, right - left + 1, 1);
|
|
654 |
// }
|
|
655 |
y++;
|
|
656 |
break;
|
|
657 |
case 1: {
|
|
658 |
int i;
|
|
659 |
my = qMin(7, bottom-y);
|
|
660 |
// Don't dup with transparency
|
|
661 |
if (trans_index < 0) {
|
|
662 |
for (i=1; i<=my; i++) {
|
|
663 |
memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb),
|
|
664 |
(right-left+1)*sizeof(QRgb));
|
|
665 |
}
|
|
666 |
}
|
|
667 |
|
|
668 |
// if (!out_of_bounds) {
|
|
669 |
// ### Changed: QRect(left, y, right - left + 1, my + 1);
|
|
670 |
// }
|
|
671 |
// if (!out_of_bounds)
|
|
672 |
// qDebug("consumer->changed(QRect(%d, %d, %d, %d))", left, y, right-left+1, my+1);
|
|
673 |
y+=8;
|
|
674 |
if (y>bottom) {
|
|
675 |
interlace++; y=top+4;
|
|
676 |
if (y > bottom) { // for really broken GIFs with bottom < 5
|
|
677 |
interlace=2;
|
|
678 |
y = top + 2;
|
|
679 |
if (y > bottom) { // for really broken GIF with bottom < 3
|
|
680 |
interlace = 0;
|
|
681 |
y = top + 1;
|
|
682 |
}
|
|
683 |
}
|
|
684 |
}
|
|
685 |
} break;
|
|
686 |
case 2: {
|
|
687 |
int i;
|
|
688 |
my = qMin(3, bottom-y);
|
|
689 |
// Don't dup with transparency
|
|
690 |
if (trans_index < 0) {
|
|
691 |
for (i=1; i<=my; i++) {
|
|
692 |
memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb),
|
|
693 |
(right-left+1)*sizeof(QRgb));
|
|
694 |
}
|
|
695 |
}
|
|
696 |
|
|
697 |
// if (!out_of_bounds) {
|
|
698 |
// ### Changed: QRect(left, y, right - left + 1, my + 1);
|
|
699 |
// }
|
|
700 |
y+=8;
|
|
701 |
if (y>bottom) {
|
|
702 |
interlace++; y=top+2;
|
|
703 |
// handle broken GIF with bottom < 3
|
|
704 |
if (y > bottom) {
|
|
705 |
interlace = 3;
|
|
706 |
y = top + 1;
|
|
707 |
}
|
|
708 |
}
|
|
709 |
} break;
|
|
710 |
case 3: {
|
|
711 |
int i;
|
|
712 |
my = qMin(1, bottom-y);
|
|
713 |
// Don't dup with transparency
|
|
714 |
if (trans_index < 0) {
|
|
715 |
for (i=1; i<=my; i++) {
|
|
716 |
memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb),
|
|
717 |
(right-left+1)*sizeof(QRgb));
|
|
718 |
}
|
|
719 |
}
|
|
720 |
// if (!out_of_bounds) {
|
|
721 |
// ### Changed: QRect(left, y, right - left + 1, my + 1);
|
|
722 |
// }
|
|
723 |
y+=4;
|
|
724 |
if (y>bottom) { interlace++; y=top+1; }
|
|
725 |
} break;
|
|
726 |
case 4:
|
|
727 |
// if (!out_of_bounds) {
|
|
728 |
// ### Changed: QRect(left, y, right - left + 1, 1);
|
|
729 |
// }
|
|
730 |
y+=2;
|
|
731 |
}
|
|
732 |
|
|
733 |
// Consume bogus extra lines
|
|
734 |
if (y >= sheight) out_of_bounds=true; //y=bottom;
|
|
735 |
}
|
|
736 |
|
|
737 |
inline QRgb QGIFFormat::color(uchar index) const
|
|
738 |
{
|
|
739 |
if (index == trans_index || index > ncols)
|
|
740 |
return Q_TRANSPARENT;
|
|
741 |
|
|
742 |
QRgb *map = lcmap ? localcmap : globalcmap;
|
|
743 |
return map ? map[index] : 0;
|
|
744 |
}
|
|
745 |
|
|
746 |
//-------------------------------------------------------------------------
|
|
747 |
//-------------------------------------------------------------------------
|
|
748 |
//-------------------------------------------------------------------------
|
|
749 |
|
|
750 |
QGifHandler::QGifHandler()
|
|
751 |
{
|
|
752 |
gifFormat = new QGIFFormat;
|
|
753 |
nextDelay = 0;
|
|
754 |
loopCnt = 0;
|
|
755 |
frameNumber = -1;
|
|
756 |
nextSize = QSize();
|
|
757 |
}
|
|
758 |
|
|
759 |
QGifHandler::~QGifHandler()
|
|
760 |
{
|
|
761 |
delete gifFormat;
|
|
762 |
}
|
|
763 |
|
|
764 |
// Does partial decode if necessary, just to see if an image is coming
|
|
765 |
|
|
766 |
bool QGifHandler::imageIsComing() const
|
|
767 |
{
|
|
768 |
const int GifChunkSize = 4096;
|
|
769 |
|
|
770 |
while (!gifFormat->partialNewFrame) {
|
|
771 |
if (buffer.isEmpty()) {
|
|
772 |
buffer += device()->read(GifChunkSize);
|
|
773 |
if (buffer.isEmpty())
|
|
774 |
break;
|
|
775 |
}
|
|
776 |
|
|
777 |
int decoded = gifFormat->decode(&lastImage, (const uchar *)buffer.constData(), buffer.size(),
|
|
778 |
&nextDelay, &loopCnt, &nextSize);
|
|
779 |
if (decoded == -1)
|
|
780 |
break;
|
|
781 |
buffer.remove(0, decoded);
|
|
782 |
}
|
|
783 |
return gifFormat->partialNewFrame;
|
|
784 |
}
|
|
785 |
|
|
786 |
bool QGifHandler::canRead() const
|
|
787 |
{
|
|
788 |
if (!nextDelay && canRead(device())) {
|
|
789 |
setFormat("gif");
|
|
790 |
return true;
|
|
791 |
}
|
|
792 |
|
|
793 |
return imageIsComing();
|
|
794 |
}
|
|
795 |
|
|
796 |
bool QGifHandler::canRead(QIODevice *device)
|
|
797 |
{
|
|
798 |
if (!device) {
|
|
799 |
qWarning("QGifHandler::canRead() called with no device");
|
|
800 |
return false;
|
|
801 |
}
|
|
802 |
|
|
803 |
char head[6];
|
|
804 |
if (device->peek(head, sizeof(head)) == sizeof(head))
|
|
805 |
return qstrncmp(head, "GIF87a", 6) == 0
|
|
806 |
|| qstrncmp(head, "GIF89a", 6) == 0;
|
|
807 |
return false;
|
|
808 |
}
|
|
809 |
|
|
810 |
bool QGifHandler::read(QImage *image)
|
|
811 |
{
|
|
812 |
const int GifChunkSize = 4096;
|
|
813 |
|
|
814 |
while (!gifFormat->newFrame) {
|
|
815 |
if (buffer.isEmpty()) {
|
|
816 |
buffer += device()->read(GifChunkSize);
|
|
817 |
if (buffer.isEmpty())
|
|
818 |
break;
|
|
819 |
}
|
|
820 |
|
|
821 |
int decoded = gifFormat->decode(&lastImage, (const uchar *)buffer.constData(), buffer.size(),
|
|
822 |
&nextDelay, &loopCnt, &nextSize);
|
|
823 |
if (decoded == -1)
|
|
824 |
break;
|
|
825 |
buffer.remove(0, decoded);
|
|
826 |
}
|
|
827 |
if (gifFormat->newFrame || (gifFormat->partialNewFrame && device()->atEnd())) {
|
|
828 |
*image = lastImage;
|
|
829 |
++frameNumber;
|
|
830 |
gifFormat->newFrame = false;
|
|
831 |
gifFormat->partialNewFrame = false;
|
|
832 |
return true;
|
|
833 |
}
|
|
834 |
|
|
835 |
return false;
|
|
836 |
}
|
|
837 |
|
|
838 |
bool QGifHandler::write(const QImage &image)
|
|
839 |
{
|
|
840 |
Q_UNUSED(image);
|
|
841 |
return false;
|
|
842 |
}
|
|
843 |
|
|
844 |
bool QGifHandler::supportsOption(ImageOption option) const
|
|
845 |
{
|
|
846 |
return option == Size
|
|
847 |
|| option == Animation;
|
|
848 |
}
|
|
849 |
|
|
850 |
QVariant QGifHandler::option(ImageOption option) const
|
|
851 |
{
|
|
852 |
if (option == Size) {
|
|
853 |
if (imageIsComing())
|
|
854 |
return nextSize;
|
|
855 |
} else if (option == Animation) {
|
|
856 |
return true;
|
|
857 |
}
|
|
858 |
return QVariant();
|
|
859 |
}
|
|
860 |
|
|
861 |
void QGifHandler::setOption(ImageOption option, const QVariant &value)
|
|
862 |
{
|
|
863 |
Q_UNUSED(option);
|
|
864 |
Q_UNUSED(value);
|
|
865 |
}
|
|
866 |
|
|
867 |
int QGifHandler::nextImageDelay() const
|
|
868 |
{
|
|
869 |
return nextDelay;
|
|
870 |
}
|
|
871 |
|
|
872 |
int QGifHandler::imageCount() const
|
|
873 |
{
|
|
874 |
return 0; // Don't know
|
|
875 |
}
|
|
876 |
|
|
877 |
int QGifHandler::loopCount() const
|
|
878 |
{
|
|
879 |
return loopCnt-1; // In GIF, loop count is iteration count, so subtract one
|
|
880 |
}
|
|
881 |
|
|
882 |
int QGifHandler::currentImageNumber() const
|
|
883 |
{
|
|
884 |
return frameNumber;
|
|
885 |
}
|
|
886 |
|
|
887 |
QByteArray QGifHandler::name() const
|
|
888 |
{
|
|
889 |
return "gif";
|
|
890 |
}
|
|
891 |
|
|
892 |
QT_END_NAMESPACE
|