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qt3/src/kernel/qjpegio.cpp

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17 KiB

/****************************************************************************
**
** Implementation of JPEG QImage IOHandler
**
** Created : 990521
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** 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.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. 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.
**
**********************************************************************/
#ifndef QT_CLEAN_NAMESPACE
#define QT_CLEAN_NAMESPACE
#endif
#include "qimage.h"
#ifndef QT_NO_IMAGEIO_JPEG
#include "qiodevice.h"
#include "qjpegio.h"
#include <stdio.h> // jpeglib needs this to be pre-included
#include <setjmp.h>
// including jpeglib.h seems to be a little messy
extern "C" {
#define XMD_H // shut JPEGlib up
#if defined(Q_OS_UNIXWARE)
# define HAVE_BOOLEAN // libjpeg under Unixware seems to need this
#endif
#include <jpeglib.h>
#ifdef const
# undef const // remove crazy C hackery in jconfig.h
#endif
}
struct my_error_mgr : public jpeg_error_mgr {
jmp_buf setjmp_buffer;
};
#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
static
void my_error_exit (j_common_ptr cinfo)
{
my_error_mgr* myerr = (my_error_mgr*) cinfo->err;
char buffer[JMSG_LENGTH_MAX];
(*cinfo->err->format_message)(cinfo, buffer);
qWarning("%s", buffer);
longjmp(myerr->setjmp_buffer, 1);
}
#if defined(Q_C_CALLBACKS)
}
#endif
static const int max_buf = 4096;
struct my_jpeg_source_mgr : public jpeg_source_mgr {
// Nothing dynamic - cannot rely on destruction over longjump
QImageIO* iio;
JOCTET buffer[max_buf];
public:
my_jpeg_source_mgr(QImageIO* iio);
};
#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
static
void qt_init_source(j_decompress_ptr)
{
}
static
boolean qt_fill_input_buffer(j_decompress_ptr cinfo)
{
int num_read;
my_jpeg_source_mgr* src = (my_jpeg_source_mgr*)cinfo->src;
QIODevice* dev = src->iio->ioDevice();
src->next_input_byte = src->buffer;
num_read = dev->readBlock((char*)src->buffer, max_buf);
if ( num_read <= 0 ) {
// Insert a fake EOI marker - as per jpeglib recommendation
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI;
src->bytes_in_buffer = 2;
} else {
src->bytes_in_buffer = num_read;
}
#if defined(Q_OS_UNIXWARE)
return B_TRUE;
#else
return TRUE;
#endif
}
static
void qt_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
my_jpeg_source_mgr* src = (my_jpeg_source_mgr*)cinfo->src;
// `dumb' implementation from jpeglib
/* Just a dumb implementation for now. Could use fseek() except
* it doesn't work on pipes. Not clear that being smart is worth
* any trouble anyway --- large skips are infrequent.
*/
if (num_bytes > 0) {
while (num_bytes > (long) src->bytes_in_buffer) {
num_bytes -= (long) src->bytes_in_buffer;
(void) qt_fill_input_buffer(cinfo);
/* note we assume that qt_fill_input_buffer will never return FALSE,
* so suspension need not be handled.
*/
}
src->next_input_byte += (size_t) num_bytes;
src->bytes_in_buffer -= (size_t) num_bytes;
}
}
static
void qt_term_source(j_decompress_ptr)
{
}
#if defined(Q_C_CALLBACKS)
}
#endif
inline my_jpeg_source_mgr::my_jpeg_source_mgr(QImageIO* iioptr)
{
jpeg_source_mgr::init_source = qt_init_source;
jpeg_source_mgr::fill_input_buffer = qt_fill_input_buffer;
jpeg_source_mgr::skip_input_data = qt_skip_input_data;
jpeg_source_mgr::resync_to_restart = jpeg_resync_to_restart;
jpeg_source_mgr::term_source = qt_term_source;
iio = iioptr;
bytes_in_buffer = 0;
next_input_byte = buffer;
}
static
void scaleSize( int &reqW, int &reqH, int imgW, int imgH, QImage::ScaleMode mode )
{
if ( mode == QImage::ScaleFree )
return;
int t1 = imgW * reqH;
int t2 = reqW * imgH;
if (( mode == QImage::ScaleMin && (t1 > t2) ) || ( mode == QImage::ScaleMax && (t1 < t2) ))
reqH = t2 / imgW;
else
reqW = t1 / imgH;
}
static
void read_jpeg_image(QImageIO* iio)
{
QImage image;
struct jpeg_decompress_struct cinfo;
struct my_jpeg_source_mgr *iod_src = new my_jpeg_source_mgr(iio);
struct my_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = my_error_exit;
jpeg_create_decompress(&cinfo);
cinfo.src = iod_src;
if (!setjmp(jerr.setjmp_buffer)) {
#if defined(Q_OS_UNIXWARE)
(void) jpeg_read_header(&cinfo, B_TRUE);
#else
(void) jpeg_read_header(&cinfo, TRUE);
#endif
(void) jpeg_start_decompress(&cinfo);
QString params = iio->parameters();
params.simplifyWhiteSpace();
int sWidth = 0, sHeight = 0;
char sModeStr[1024] = "";
QImage::ScaleMode sMode;
if ( params.contains( "GetHeaderInformation" ) ) {
// Create QImage's without allocating the data
if ( cinfo.output_components == 3 || cinfo.output_components == 4) {
image = QImage( NULL, cinfo.output_width, cinfo.output_height, 32, NULL, 0, QImage::IgnoreEndian );
} else if ( cinfo.output_components == 1 ) {
image = QImage( NULL, cinfo.output_width, cinfo.output_height, 8, NULL, 0, QImage::IgnoreEndian );
} else {
// Unsupported format
}
} else if ( params.contains( "Scale" ) ) {
sscanf( params.latin1(), "Scale( %i, %i, %1023s )",
&sWidth, &sHeight, sModeStr );
QString sModeQStr( sModeStr );
if ( sModeQStr == "ScaleFree" ) {
sMode = QImage::ScaleFree;
} else if ( sModeQStr == "ScaleMin" ) {
sMode = QImage::ScaleMin;
} else if ( sModeQStr == "ScaleMax" ) {
sMode = QImage::ScaleMax;
} else {
qDebug("read_jpeg_image: invalid scale mode \"%s\", see QImage::ScaleMode documentation", sModeStr);
sMode = QImage::ScaleFree;
}
// qDebug( "Parameters ask to scale the image to %i x %i ScaleMode: %s", sWidth, sHeight, sModeStr );
scaleSize( sWidth, sHeight, cinfo.output_width, cinfo.output_height, sMode );
// qDebug( "Scaling the jpeg to %i x %i", sWidth, sHeight, sModeStr );
bool created = FALSE;
if ( cinfo.output_components == 3 || cinfo.output_components == 4) {
created = image.create( sWidth, sHeight, 32 );
} else if ( cinfo.output_components == 1 ) {
created = image.create( sWidth, sHeight, 8, 256 );
for (int i=0; i<256; i++)
image.setColor(i, qRgb(i,i,i));
} else {
// Unsupported format
}
if (!created)
image = QImage();
if (!image.isNull()) {
QImage tmpImage( cinfo.output_width, 1, 32 );
uchar** inLines = tmpImage.jumpTable();
uchar** outLines = image.jumpTable();
while (cinfo.output_scanline < cinfo.output_height) {
int outputLine = sHeight * cinfo.output_scanline / cinfo.output_height;
(void) jpeg_read_scanlines(&cinfo, inLines, 1);
if ( cinfo.output_components == 3 ) {
uchar *in = inLines[0];
QRgb *out = (QRgb*)outLines[outputLine];
for (uint i=0; i<cinfo.output_width; i++ ) {
// ### Only scaling down an image works, I don't think scaling up will work at the moment
// ### An idea I have to make this a smooth scale is to progressively add the pixel values up
// When scaling down, multiple values are being over drawn in to the output buffer.
// Instead, a weighting based on the distance the line or pixel is from the output pixel determines
// the weight of it when added to the output buffer. At present it is a non-smooth scale which is
// inefficently implemented, it still uncompresses all the jpeg, an optimization for progressive
// jpegs could be made if scaling by say 50% or some other special cases
out[sWidth * i / cinfo.output_width] = qRgb( in[0], in[1], in[2] );
in += 3;
}
} else {
// ### Need to test the case where the jpeg is grayscale, need some black and white jpegs to test
// this code. (also only scales down and probably won't scale to a larger size)
uchar *in = inLines[0];
uchar *out = outLines[outputLine];
for (uint i=0; i<cinfo.output_width; i++ ) {
out[sWidth * i / cinfo.output_width] = in[i];
}
}
}
(void) jpeg_finish_decompress(&cinfo);
}
} else {
bool created = FALSE;
if ( cinfo.output_components == 3 || cinfo.output_components == 4) {
created = image.create( cinfo.output_width, cinfo.output_height, 32 );
} else if ( cinfo.output_components == 1 ) {
created = image.create( cinfo.output_width, cinfo.output_height, 8, 256 );
for (int i=0; i<256; i++)
image.setColor(i, qRgb(i,i,i));
} else {
// Unsupported format
}
if (!created)
image = QImage();
if (!image.isNull()) {
uchar** lines = image.jumpTable();
while (cinfo.output_scanline < cinfo.output_height)
(void) jpeg_read_scanlines(&cinfo,
lines + cinfo.output_scanline,
cinfo.output_height);
(void) jpeg_finish_decompress(&cinfo);
if ( cinfo.output_components == 3 ) {
// Expand 24->32 bpp.
for (uint j=0; j<cinfo.output_height; j++) {
uchar *in = image.scanLine(j) + cinfo.output_width * 3;
QRgb *out = (QRgb*)image.scanLine(j);
for (uint i=cinfo.output_width; i--; ) {
in-=3;
out[i] = qRgb(in[0], in[1], in[2]);
}
}
}
}
}
if (!image.isNull()) {
if ( cinfo.density_unit == 1 ) {
image.setDotsPerMeterX( int(100. * cinfo.X_density / 2.54) );
image.setDotsPerMeterY( int(100. * cinfo.Y_density / 2.54) );
} else if ( cinfo.density_unit == 2 ) {
image.setDotsPerMeterX( int(100. * cinfo.X_density) );
image.setDotsPerMeterY( int(100. * cinfo.Y_density) );
}
}
iio->setImage(image);
iio->setStatus(image.isNull());
}
jpeg_destroy_decompress(&cinfo);
delete iod_src;
}
struct my_jpeg_destination_mgr : public jpeg_destination_mgr {
// Nothing dynamic - cannot rely on destruction over longjump
QImageIO* iio;
JOCTET buffer[max_buf];
public:
my_jpeg_destination_mgr(QImageIO*);
};
#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
static
void qt_init_destination(j_compress_ptr)
{
}
static
void qt_exit_on_error(j_compress_ptr cinfo, QIODevice* dev)
{
if (dev->status() == IO_Ok) {
return;
} else {
// cinfo->err->msg_code = JERR_FILE_WRITE;
(*cinfo->err->error_exit)((j_common_ptr)cinfo);
}
}
static
boolean qt_empty_output_buffer(j_compress_ptr cinfo)
{
my_jpeg_destination_mgr* dest = (my_jpeg_destination_mgr*)cinfo->dest;
QIODevice* dev = dest->iio->ioDevice();
if ( dev->writeBlock( (char*)dest->buffer, max_buf ) != max_buf )
qt_exit_on_error(cinfo, dev);
dest->next_output_byte = dest->buffer;
dest->free_in_buffer = max_buf;
#if defined(Q_OS_UNIXWARE)
return B_TRUE;
#else
return TRUE;
#endif
}
static
void qt_term_destination(j_compress_ptr cinfo)
{
my_jpeg_destination_mgr* dest = (my_jpeg_destination_mgr*)cinfo->dest;
QIODevice* dev = dest->iio->ioDevice();
Q_LONG n = max_buf - dest->free_in_buffer;
if ( dev->writeBlock( (char*)dest->buffer, n ) != n )
qt_exit_on_error(cinfo, dev);
dev->flush();
qt_exit_on_error(cinfo, dev);
}
#if defined(Q_C_CALLBACKS)
}
#endif
inline
my_jpeg_destination_mgr::my_jpeg_destination_mgr(QImageIO* iioptr)
{
jpeg_destination_mgr::init_destination = qt_init_destination;
jpeg_destination_mgr::empty_output_buffer = qt_empty_output_buffer;
jpeg_destination_mgr::term_destination = qt_term_destination;
iio = iioptr;
next_output_byte = buffer;
free_in_buffer = max_buf;
}
static
void write_jpeg_image(QImageIO* iio)
{
QImage image = iio->image();
struct jpeg_compress_struct cinfo;
JSAMPROW row_pointer[1];
row_pointer[0] = 0;
struct my_jpeg_destination_mgr *iod_dest = new my_jpeg_destination_mgr(iio);
struct my_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = my_error_exit;
if (!setjmp(jerr.setjmp_buffer)) {
jpeg_create_compress(&cinfo);
cinfo.dest = iod_dest;
cinfo.image_width = image.width();
cinfo.image_height = image.height();
QRgb* cmap=0;
bool gray=FALSE;
switch ( image.depth() ) {
case 1:
case 8:
cmap = image.colorTable();
gray = TRUE;
int i;
for (i=image.numColors(); gray && i--; ) {
gray = gray & ( qRed(cmap[i]) == qGreen(cmap[i]) &&
qRed(cmap[i]) == qBlue(cmap[i]) );
}
cinfo.input_components = gray ? 1 : 3;
cinfo.in_color_space = gray ? JCS_GRAYSCALE : JCS_RGB;
break;
case 32:
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
}
jpeg_set_defaults(&cinfo);
float diffInch = QABS(image.dotsPerMeterX()*2.54/100. - qRound(image.dotsPerMeterX()*2.54/100.))
+ QABS(image.dotsPerMeterY()*2.54/100. - qRound(image.dotsPerMeterY()*2.54/100.));
float diffCm = (QABS(image.dotsPerMeterX()/100. - qRound(image.dotsPerMeterX()/100.))
+ QABS(image.dotsPerMeterY()/100. - qRound(image.dotsPerMeterY()/100.)))*2.54;
if (diffInch < diffCm) {
cinfo.density_unit = 1; // dots/inch
cinfo.X_density = qRound(image.dotsPerMeterX()*2.54/100.);
cinfo.Y_density = qRound(image.dotsPerMeterY()*2.54/100.);
} else {
cinfo.density_unit = 2; // dots/cm
cinfo.X_density = (image.dotsPerMeterX()+50) / 100;
cinfo.Y_density = (image.dotsPerMeterY()+50) / 100;
}
int quality = iio->quality() >= 0 ? QMIN(iio->quality(),100) : 75;
#if defined(Q_OS_UNIXWARE)
jpeg_set_quality(&cinfo, quality, B_TRUE /* limit to baseline-JPEG values */);
jpeg_start_compress(&cinfo, B_TRUE);
#else
jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
jpeg_start_compress(&cinfo, TRUE);
#endif
row_pointer[0] = new uchar[cinfo.image_width*cinfo.input_components];
int w = cinfo.image_width;
while (cinfo.next_scanline < cinfo.image_height) {
uchar *row = row_pointer[0];
switch ( image.depth() ) {
case 1:
if (gray) {
uchar* data = image.scanLine(cinfo.next_scanline);
if ( image.bitOrder() == QImage::LittleEndian ) {
for (int i=0; i<w; i++) {
bool bit = !!(*(data + (i >> 3)) & (1 << (i & 7)));
row[i] = qRed(cmap[bit]);
}
} else {
for (int i=0; i<w; i++) {
bool bit = !!(*(data + (i >> 3)) & (1 << (7 -(i & 7))));
row[i] = qRed(cmap[bit]);
}
}
} else {
uchar* data = image.scanLine(cinfo.next_scanline);
if ( image.bitOrder() == QImage::LittleEndian ) {
for (int i=0; i<w; i++) {
bool bit = !!(*(data + (i >> 3)) & (1 << (i & 7)));
*row++ = qRed(cmap[bit]);
*row++ = qGreen(cmap[bit]);
*row++ = qBlue(cmap[bit]);
}
} else {
for (int i=0; i<w; i++) {
bool bit = !!(*(data + (i >> 3)) & (1 << (7 -(i & 7))));
*row++ = qRed(cmap[bit]);
*row++ = qGreen(cmap[bit]);
*row++ = qBlue(cmap[bit]);
}
}
}
break;
case 8:
if (gray) {
uchar* pix = image.scanLine(cinfo.next_scanline);
for (int i=0; i<w; i++) {
*row = qRed(cmap[*pix]);
++row; ++pix;
}
} else {
uchar* pix = image.scanLine(cinfo.next_scanline);
for (int i=0; i<w; i++) {
*row++ = qRed(cmap[*pix]);
*row++ = qGreen(cmap[*pix]);
*row++ = qBlue(cmap[*pix]);
++pix;
}
}
break;
case 32: {
QRgb* rgb = (QRgb*)image.scanLine(cinfo.next_scanline);
for (int i=0; i<w; i++) {
*row++ = qRed(*rgb);
*row++ = qGreen(*rgb);
*row++ = qBlue(*rgb);
++rgb;
}
}
}
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
iio->setStatus(0);
}
delete iod_dest;
delete [] row_pointer[0];
}
void qInitJpegIO()
{
// Not much to go on - just 3 bytes: 0xFF, M_SOI, 0xFF
// Even the third is not strictly specified as required.
QImageIO::defineIOHandler("JPEG", "^\377\330\377", 0, read_jpeg_image, write_jpeg_image);
}
#endif