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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the tools applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qanimationwriter.h"
+#include <QFile>
+#include <QString>
+#include <QPainter>
+#include <png.h>
+#include <limits.h>
+#include <netinet/in.h> // for htonl
+
+#ifdef QT_LINUXBASE
+# include <arpa/inet.h> // for htonl (LSB only)
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QAnimationWriterData
+{
+public:
+ QAnimationWriterData(QIODevice* d) : framerate(1000), dev(d) {}
+ void setFrameRate(int d) { framerate = d; }
+ virtual ~QAnimationWriterData() { }
+ virtual void setImage(const QImage& src)=0;
+ virtual bool canCompose() const { return false; }
+ virtual void composeImage(const QImage&, const QPoint& ) {}
+
+protected:
+ int framerate;
+ QIODevice* dev;
+};
+
+
+class QAnimationWriterMNG : public QAnimationWriterData {
+ bool first;
+ png_structp png_ptr;
+ png_infop info_ptr;
+public:
+ QAnimationWriterMNG(QIODevice* d) : QAnimationWriterData(d)
+ {
+ first = true;
+ begin_png();
+ }
+
+ ~QAnimationWriterMNG()
+ {
+ if (first) {
+ // Eh? Not images.
+ QImage dummy(1,1,QImage::Format_RGB32);
+ setImage(dummy);
+ }
+ writeMEND();
+ end_png();
+ }
+
+ void begin_png()
+ {
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,0,0,0);
+ info_ptr = png_create_info_struct(png_ptr);
+ png_set_compression_level(png_ptr,9);
+ png_set_write_fn(png_ptr, (void*)this, write, 0);
+ }
+
+ void end_png()
+ {
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ }
+
+ static void write( png_structp png_ptr, png_bytep data, png_size_t length)
+ {
+ QAnimationWriterMNG* that = (QAnimationWriterMNG*)png_get_io_ptr(png_ptr);
+ /*uint nw =*/ that->dev->write((const char*)data,length);
+ }
+
+ void writePNG(const QImage& image)
+ {
+#if !defined(QT_LINUXBASE) && \
+ (PNG_LIBPNG_VER_MAJOR < 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR <= 4))
+ // LSB disallows accessing the info_ptr directly. LSB's png_set_IHDR sets
+ // the channels anyways, so just comment it out for LSB usage.
+ // In libpng >= 1.5, the png_info struct is no longer exported.
+ info_ptr->channels = 4;
+#endif
+ png_set_sig_bytes(png_ptr, 8); // Pretend we already wrote the sig
+ png_set_IHDR(png_ptr, info_ptr, image.width(), image.height(),
+ 8, image.hasAlphaChannel()
+ ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB,
+ 0, 0, 0);
+ png_write_info(png_ptr, info_ptr);
+ if (!image.hasAlphaChannel())
+ png_set_filler(png_ptr, 0,
+ QSysInfo::ByteOrder == QSysInfo::BigEndian ?
+ PNG_FILLER_BEFORE : PNG_FILLER_AFTER);
+ //if ( QImage::systemByteOrder() == QImage::BigEndian ) {
+ //png_set_swap_alpha(png_ptr);
+ //}
+ if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) {
+ png_set_bgr(png_ptr);
+ }
+
+ int height = image.height();
+ png_bytep *row_pointers = new png_bytep[height];
+ for (int i = 0; i < height; ++i)
+ row_pointers[i] = (png_bytep)image.scanLine(i);
+ png_write_image(png_ptr, row_pointers);
+ delete [] row_pointers;
+ png_write_end(png_ptr, info_ptr);
+ end_png();
+ begin_png();
+ }
+
+ void writeMHDR(const QSize& size, int framerate)
+ {
+ dev->write("\212MNG\r\n\032\n", 8);
+
+ struct {
+ int width;
+ int height;
+ int framerate;
+ int a,b,c;
+ int profile;
+ } chunk;
+ chunk.width = htonl(size.width());
+ chunk.height = htonl(size.height());
+ chunk.framerate = htonl(framerate);
+ chunk.a=0;
+ chunk.b=0;
+ chunk.c=0;
+ chunk.profile = htonl(0x00000003);
+
+ png_write_chunk(png_ptr, (png_byte*)"MHDR", (png_byte*)&chunk, sizeof(chunk));
+ }
+
+ void writeMEND()
+ {
+ png_write_chunk(png_ptr, (png_byte*)"MEND", 0, 0);
+ }
+
+ void writeDEFI(const QPoint& offset, const QSize& /*size*/)
+ {
+ struct {
+ ushort o;
+ uchar s;
+ uchar concrete;
+ int x,y;
+ int lc,rc,tc,bc;
+ } chunk;
+ chunk.o=0;
+ chunk.s=0;
+ chunk.concrete=1;
+ chunk.x=htonl(offset.x());
+ chunk.y=htonl(offset.y());
+ chunk.lc=0;
+ chunk.rc=0;
+ chunk.tc=htonl(INT_MAX);
+ chunk.bc=htonl(INT_MAX);
+
+ png_write_chunk(png_ptr, (png_byte*)"DEFI", (png_byte*)&chunk, sizeof(chunk));
+ }
+
+ void writeFRAM(const QSize& size)
+ {
+ struct {
+ uchar mode;
+ uchar n;
+ uchar nu;
+ uchar d;
+ uchar t;
+ uchar clip;
+ uchar s;
+ uchar deltatype;
+ uint left;
+ uint right;
+ uint top;
+ uint bottom;
+ } chunk;
+ chunk.mode=1;
+ chunk.n='a';
+ chunk.nu=0;
+ chunk.d=0;
+ chunk.clip=1;
+ chunk.t=0;
+ chunk.s=0;
+ chunk.deltatype=0;
+ chunk.left=0;
+ chunk.right=htonl(size.width());
+ chunk.top=0;
+ chunk.bottom=htonl(size.height());
+
+ png_write_chunk(png_ptr, (png_byte*)"FRAM", (png_byte*)&chunk, sizeof(chunk));
+ }
+
+ void writeMOVE(const QPoint& offset)
+ {
+ struct {
+ uchar filler[3];
+ uchar z[5];
+ int x,y;
+ } chunk;
+ memset(chunk.z,0,5);
+ chunk.x=htonl(offset.x());
+ chunk.y=htonl(offset.y());
+
+ png_write_chunk(png_ptr, (png_byte*)"MOVE", ((png_byte*)&chunk)+3, sizeof(chunk)-3);
+ }
+
+ void setImage(const QImage& src)
+ {
+ if (first) {
+ first = false;
+ writeMHDR(src.size(),framerate);
+ }
+ composeImage(src,QPoint(0,0));
+ }
+
+ bool canCompose() const { return true; }
+
+ void composeImage(const QImage& src, const QPoint& offset)
+ {
+ writeMOVE(offset);
+ //writeFRAM(src.size());
+ writePNG(src);
+ }
+};
+
+QAnimationWriter::QAnimationWriter(const QString& filename, const char* format)
+{
+ if (qstrncmp(format, "MNG", 4)) {
+ qWarning("Format \"%s\" not supported, only MNG", format);
+ dev = 0;
+ d = 0;
+ } else {
+ QFile *f = new QFile(filename);
+ f->open(QIODevice::WriteOnly);
+ dev = f;
+ d = new QAnimationWriterMNG(dev);
+ }
+}
+
+bool QAnimationWriter::okay() const
+{
+ if (!dev)
+ return false;
+ QFile *file = qobject_cast<QFile*>(dev);
+ Q_ASSERT(file);
+ return (file->error() == QFile::NoError);
+}
+
+QAnimationWriter::~QAnimationWriter()
+{
+ delete d;
+ delete dev;
+}
+
+void QAnimationWriter::setFrameRate(int r)
+{
+ if (d)
+ d->setFrameRate(r);
+}
+
+void QAnimationWriter::appendFrame(const QImage& frm, const QPoint& offset)
+{
+ if (!dev)
+ return;
+
+ const QImage frame = frm.convertToFormat(QImage::Format_RGB32);
+ const int alignx = 1;
+ if (prev.isNull() || !d->canCompose()) {
+ d->setImage(frame);
+ } else {
+ bool done;
+ int minx, maxx, miny, maxy;
+ int w = frame.width();
+ int h = frame.height();
+
+ const quint32 *framePtr = reinterpret_cast<const quint32*>(frame.bits());
+ const quint32 *prevPtr = reinterpret_cast<const quint32*>(prev.bits());
+ const int frameStride = frame.bytesPerLine() / sizeof(quint32);
+ const int prevStride = prev.bytesPerLine() / sizeof(quint32);
+
+ // Find left edge of change
+ done = false;
+ for (minx = 0; minx < w && !done; ++minx) {
+ const quint32 *p1 = framePtr + minx;
+ const quint32 *p2 = prevPtr + minx + offset.x();
+ for (int y = 0; y < h; ++y) {
+ if (*p1 != *p2) {
+ done = true;
+ break;
+ }
+ p1 += frameStride;
+ p2 += prevStride;
+ }
+ }
+ --minx;
+
+ // Find right edge of change
+ done = false;
+ for (maxx = w-1; maxx >= 0 && !done; --maxx) {
+ const quint32 *p1 = framePtr + maxx;
+ const quint32 *p2 = prevPtr + maxx + offset.x();
+ for (int y = 0; y < h; ++y) {
+ if (*p1 != *p2) {
+ done = true;
+ break;
+ }
+ p1 += frameStride;
+ p2 += prevStride;
+ }
+ }
+ ++maxx;
+
+ // Find top edge of change
+ done = false;
+ for (miny = 0; miny < h && !done; ++miny) {
+ const quint32 *p1 = framePtr + miny * frameStride;
+ const quint32 *p2 = prevPtr + miny * prevStride + offset.x();
+ for (int x = 0; x < w; ++x) {
+ if (*p1 != *p2) {
+ done = true;
+ break;
+ }
+ ++p1;
+ ++p2;
+ }
+ }
+ --miny;
+
+ // Find right edge of change
+ done = false;
+ for (maxy = h-1; maxy >= 0 && !done; --maxy) {
+ const quint32 *p1 = framePtr + maxy * frameStride;
+ const quint32 *p2 = prevPtr + maxy * prevStride + offset.x();
+ for (int x = 0; x < w; ++x) {
+ if (*p1 != *p2) {
+ done = true;
+ break;
+ }
+ ++p1;
+ ++p2;
+ }
+ }
+ ++maxy;
+
+ if (minx > maxx)
+ minx = maxx = 0;
+ if (miny > maxy)
+ miny = maxy = 0;
+
+ if (alignx > 1) {
+ minx -= minx % alignx;
+ maxx = maxx - maxx % alignx + alignx - 1;
+ }
+
+ int dw = maxx - minx + 1;
+ int dh = maxy - miny + 1;
+
+ QImage diff(dw, dh, QImage::Format_ARGB32);
+
+ int x, y;
+ for (y = 0; y < dh; ++y) {
+ QRgb* li = (QRgb*)frame.scanLine(y+miny)+minx;
+ QRgb* lp = (QRgb*)prev.scanLine(y+miny+offset.y())+minx+offset.x();
+ QRgb* ld = (QRgb*)diff.scanLine(y);
+ if (alignx) {
+ for (x = 0; x < dw; x += alignx) {
+ int i;
+ for (i = 0; i < alignx; ++i) {
+ if (li[x+i] != lp[x+i])
+ break;
+ }
+ if (i == alignx) {
+ // All the same
+ for (i = 0; i < alignx; ++i)
+ ld[x+i] = qRgba(0,0,0,0);
+ } else {
+ // Some different
+ for (i = 0; i < alignx; ++i)
+ ld[x+i] = 0xff000000 | li[x+i];
+ }
+ }
+ } else {
+ for (x = 0; x < dw; ++x) {
+ if (li[x] != lp[x])
+ ld[x] = 0xff000000 | li[x];
+ else
+ ld[x] = qRgba(0,0,0,0);
+ }
+ }
+ }
+
+ d->composeImage(diff, QPoint(minx, miny) + offset);
+ }
+ if (prev.isNull() || (prev.size() == frame.size() && offset == QPoint(0,0))) {
+ prev = frame;
+ } else {
+ QPainter p(&prev);
+ p.drawImage(offset.x(), offset.y(), frame, 0, 0,
+ frame.width(), frame.height());
+ }
+}
+
+void QAnimationWriter::appendFrame(const QImage& frm)
+{
+ appendFrame(frm, QPoint(0,0));
+}
+
+void QAnimationWriter::appendBlankFrame()
+{
+ QImage i(1,1,QImage::Format_ARGB32);
+ i.fill(0);
+ d->composeImage(i, QPoint(0,0));
+}
+
+QT_END_NAMESPACE
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