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qt3/tools/qvfb/qanimationwriter.cpp

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9.7 KiB

/**********************************************************************
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of Qt/Embedded virtual framebuffer.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with
** the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qanimationwriter.h"
#define QT_CLEAN_NAMESPACE
#include <qfile.h>
#include <png.h>
#include <netinet/in.h> // for htonl
class QAnimationWriterData {
public:
QAnimationWriterData(QIODevice* d) : dev(d)
{
framerate = 1000;
}
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(1,1,32);
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->writeBlock((const char*)data,length);
}
void writePNG(const QImage& image)
{
info_ptr->channels = 4;
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.hasAlphaBuffer()
? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB,
0, 0, 0);
png_write_info(png_ptr, info_ptr);
if ( !image.hasAlphaBuffer() )
png_set_filler(png_ptr, 0,
QImage::systemByteOrder() == QImage::BigEndian ?
PNG_FILLER_BEFORE : PNG_FILLER_AFTER);
//if ( QImage::systemByteOrder() == QImage::BigEndian ) {
//png_set_swap_alpha(png_ptr);
//}
if ( QImage::systemByteOrder() == QImage::LittleEndian ) {
png_set_bgr(png_ptr);
}
png_bytep* row_pointers;
uint height = image.height();
uchar** jt = image.jumpTable();
row_pointers=new png_bytep[height];
uint y;
for (y=0; y<height; y++) {
row_pointers[y]=jt[y];
}
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->writeBlock("\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 ( QCString(format) != "MNG" ) {
qWarning("Format \"%s\" not supported, only MNG", format);
dev = 0;
d = 0;
} else {
QFile *f = new QFile(filename);
f->open(IO_WriteOnly);
dev = f;
d = new QAnimationWriterMNG(dev);
}
}
bool QAnimationWriter::okay() const
{
return dev && dev->status() == IO_Ok;
}
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)
{
QImage frame = frm.convertDepth(32);
const int alignx = 1;
if ( dev ) {
if ( prev.isNull() || !d->canCompose() ) {
d->setImage(frame);
} else {
bool done;
int minx, maxx, miny, maxy;
int w = frame.width();
int h = frame.height();
QRgb** jt = (QRgb**)frame.jumpTable();
QRgb** pjt = (QRgb**)prev.jumpTable() + offset.y();
// Find left edge of change
done = FALSE;
for (minx = 0; minx < w && !done; minx++) {
for (int ty = 0; ty < h; ty++) {
if ( jt[ty][minx] != pjt[ty][minx+offset.x()] ) {
done = TRUE;
break;
}
}
}
minx--;
// Find right edge of change
done = FALSE;
for (maxx = w-1; maxx >= 0 && !done; maxx--) {
for (int ty = 0; ty < h; ty++) {
if ( jt[ty][maxx] != pjt[ty][maxx+offset.x()] ) {
done = TRUE;
break;
}
}
}
maxx++;
// Find top edge of change
done = FALSE;
for (miny = 0; miny < h && !done; miny++) {
for (int tx = 0; tx < w; tx++) {
if ( jt[miny][tx] != pjt[miny][tx+offset.x()] ) {
done = TRUE;
break;
}
}
}
miny--;
// Find right edge of change
done = FALSE;
for (maxy = h-1; maxy >= 0 && !done; maxy--) {
for (int tx = 0; tx < w; tx++) {
if ( jt[maxy][tx] != pjt[maxy][tx+offset.x()] ) {
done = TRUE;
break;
}
}
}
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, 32);
diff.setAlphaBuffer(TRUE);
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);
}
}
}
qDebug("%d,%d %d,%d",minx,miny,offset.x(),offset.y());
d->composeImage(diff,QPoint(minx,miny)+offset);
}
if ( prev.isNull() || prev.size() == frame.size() && offset == QPoint(0,0) ) {
prev = frame;
} else {
bitBlt(&prev,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(1,1,32);
i.setAlphaBuffer(TRUE);
i.fill(0);
d->composeImage(i,QPoint(0,0));
}