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tdelibs/khtml/misc/loader_jpeg.cpp

549 lines
16 KiB

/*
This file is part of the KDE libraries
Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_LIBJPEG
// on some systems, libjpeg installs its config.h file which causes a conflict
// and makes the compiler barf with "XXX already defined".
#ifdef HAVE_STDLIB_H
#undef HAVE_STDLIB_H
#endif
#include "loader_jpeg.h"
#include <stdio.h>
#include <setjmp.h>
#include <qdatetime.h>
#include <kglobal.h>
extern "C" {
#define XMD_H
#include <jpeglib.h>
#undef const
}
#undef BUFFER_DEBUG
//#define BUFFER_DEBUG
#undef JPEG_DEBUG
//#define JPEG_DEBUG
// -----------------------------------------------------------------------------
struct khtml_error_mgr : public jpeg_error_mgr {
jmp_buf setjmp_buffer;
};
extern "C" {
static
void khtml_error_exit (j_common_ptr cinfo)
{
khtml_error_mgr* myerr = (khtml_error_mgr*) cinfo->err;
char buffer[JMSG_LENGTH_MAX];
(*cinfo->err->format_message)(cinfo, buffer);
#ifdef JPEG_DEBUG
qWarning("%s", buffer);
#endif
longjmp(myerr->setjmp_buffer, 1);
}
}
static const int max_buf = 32768;
static const int max_consumingtime = 2000;
struct khtml_jpeg_source_mgr : public jpeg_source_mgr {
JOCTET buffer[max_buf];
int valid_buffer_len;
size_t skip_input_bytes;
int ateof;
QRect change_rect;
QRect old_change_rect;
QTime decoder_timestamp;
bool final_pass;
bool decoding_done;
bool do_progressive;
public:
khtml_jpeg_source_mgr() KDE_NO_EXPORT;
};
extern "C" {
static
void khtml_j_decompress_dummy(j_decompress_ptr)
{
}
static
boolean khtml_fill_input_buffer(j_decompress_ptr cinfo)
{
#ifdef BUFFER_DEBUG
qDebug("khtml_fill_input_buffer called!");
#endif
khtml_jpeg_source_mgr* src = (khtml_jpeg_source_mgr*)cinfo->src;
if ( src->ateof )
{
/* 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;
src->next_input_byte = (JOCTET *) src->buffer;
#ifdef BUFFER_DEBUG
qDebug("...returning true!");
#endif
return true;
}
else
return false; /* I/O suspension mode */
}
static
void khtml_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
if(num_bytes <= 0)
return; /* required noop */
#ifdef BUFFER_DEBUG
qDebug("khtml_skip_input_data (%d) called!", num_bytes);
#endif
khtml_jpeg_source_mgr* src = (khtml_jpeg_source_mgr*)cinfo->src;
src->skip_input_bytes += num_bytes;
unsigned int skipbytes = kMin(src->bytes_in_buffer, src->skip_input_bytes);
#ifdef BUFFER_DEBUG
qDebug("skip_input_bytes is now %d", src->skip_input_bytes);
qDebug("skipbytes is now %d", skipbytes);
qDebug("valid_buffer_len is before %d", src->valid_buffer_len);
qDebug("bytes_in_buffer is %d", src->bytes_in_buffer);
#endif
if(skipbytes < src->bytes_in_buffer)
memmove(src->buffer, src->next_input_byte+skipbytes, src->bytes_in_buffer - skipbytes);
src->bytes_in_buffer -= skipbytes;
src->valid_buffer_len = src->bytes_in_buffer;
src->skip_input_bytes -= skipbytes;
/* adjust data for jpeglib */
cinfo->src->next_input_byte = (JOCTET *) src->buffer;
cinfo->src->bytes_in_buffer = (size_t) src->valid_buffer_len;
#ifdef BUFFER_DEBUG
qDebug("valid_buffer_len is afterwards %d", src->valid_buffer_len);
qDebug("skip_input_bytes is now %d", src->skip_input_bytes);
#endif
}
}
khtml_jpeg_source_mgr::khtml_jpeg_source_mgr()
{
jpeg_source_mgr::init_source = khtml_j_decompress_dummy;
jpeg_source_mgr::fill_input_buffer = khtml_fill_input_buffer;
jpeg_source_mgr::skip_input_data = khtml_skip_input_data;
jpeg_source_mgr::resync_to_restart = jpeg_resync_to_restart;
jpeg_source_mgr::term_source = khtml_j_decompress_dummy;
bytes_in_buffer = 0;
valid_buffer_len = 0;
skip_input_bytes = 0;
ateof = 0;
next_input_byte = buffer;
final_pass = false;
decoding_done = false;
}
// -----------------------------------------------------------------------------
class KJPEGFormat : public QImageFormat
{
public:
KJPEGFormat();
virtual ~KJPEGFormat();
virtual int decode(QImage& img, QImageConsumer* consumer,
const uchar* buffer, int length);
private:
enum {
Init,
readHeader,
startDecompress,
decompressStarted,
consumeInput,
prepareOutputScan,
doOutputScan,
readDone,
invalid
} state;
// structs for the jpeglib
struct jpeg_decompress_struct cinfo;
struct khtml_error_mgr jerr;
struct khtml_jpeg_source_mgr jsrc;
};
// -----------------------------------------------------------------------------
KJPEGFormat::KJPEGFormat()
{
memset(&cinfo, 0, sizeof(cinfo));
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = khtml_error_exit;
cinfo.src = &jsrc;
state = Init;
}
KJPEGFormat::~KJPEGFormat()
{
(void) jpeg_destroy_decompress(&cinfo);
}
/*
* return > 0 means "consumed x bytes, need more"
* return == 0 means "end of frame reached"
* return < 0 means "fatal error in image decoding, don't call me ever again"
*/
int KJPEGFormat::decode(QImage& image, QImageConsumer* consumer, const uchar* buffer, int length)
{
#ifdef JPEG_DEBUG
qDebug("KJPEGFormat::decode(%08lx, %08lx, %08lx, %d)",
&image, consumer, buffer, length);
#endif
if(jsrc.ateof) {
#ifdef JPEG_DEBUG
qDebug("ateof, eating");
#endif
return length;
}
if(setjmp(jerr.setjmp_buffer))
{
#ifdef JPEG_DEBUG
qDebug("jump into state invalid");
#endif
if(consumer)
consumer->end();
// this is fatal
return -1;
}
int consumed = kMin(length, max_buf - jsrc.valid_buffer_len);
#ifdef BUFFER_DEBUG
qDebug("consuming %d bytes", consumed);
#endif
// filling buffer with the new data
memcpy(jsrc.buffer + jsrc.valid_buffer_len, buffer, consumed);
jsrc.valid_buffer_len += consumed;
if(jsrc.skip_input_bytes)
{
#ifdef BUFFER_DEBUG
qDebug("doing skipping");
qDebug("valid_buffer_len %d", jsrc.valid_buffer_len);
qDebug("skip_input_bytes %d", jsrc.skip_input_bytes);
#endif
int skipbytes = kMin((size_t) jsrc.valid_buffer_len, jsrc.skip_input_bytes);
if(skipbytes < jsrc.valid_buffer_len)
memmove(jsrc.buffer, jsrc.buffer+skipbytes, jsrc.valid_buffer_len - skipbytes);
jsrc.valid_buffer_len -= skipbytes;
jsrc.skip_input_bytes -= skipbytes;
// still more bytes to skip
if(jsrc.skip_input_bytes) {
if(consumed <= 0) qDebug("ERROR!!!");
return consumed;
}
}
cinfo.src->next_input_byte = (JOCTET *) jsrc.buffer;
cinfo.src->bytes_in_buffer = (size_t) jsrc.valid_buffer_len;
#ifdef BUFFER_DEBUG
qDebug("buffer contains %d bytes", jsrc.valid_buffer_len);
#endif
if(state == Init)
{
if(jpeg_read_header(&cinfo, true) != JPEG_SUSPENDED) {
// do some simple memory requirements limitations
// as long as we use that stupid Qt stuff
int s = cinfo.image_width * cinfo.image_height;
if ( s > 16384 * 12388 )
cinfo.scale_denom = 8;
else if ( s > 8192 * 6144 )
cinfo.scale_denom = 4;
else if ( s > 4096 * 3072 )
cinfo.scale_denom = 2;
if ( consumer )
consumer->setSize(cinfo.image_width/cinfo.scale_denom,
cinfo.image_height/cinfo.scale_denom);
state = startDecompress;
}
}
if(state == startDecompress)
{
jsrc.do_progressive = jpeg_has_multiple_scans( &cinfo );
#ifdef JPEG_DEBUG
qDebug( "**** DOPROGRESSIVE: %d", jsrc.do_progressive );
#endif
if ( jsrc.do_progressive )
cinfo.buffered_image = true;
else
cinfo.buffered_image = false;
// setup image sizes
jpeg_calc_output_dimensions( &cinfo );
if ( cinfo.jpeg_color_space == JCS_YCbCr )
cinfo.out_color_space = JCS_RGB;
cinfo.do_fancy_upsampling = true;
cinfo.do_block_smoothing = false;
cinfo.quantize_colors = false;
// false: IO suspension
if(jpeg_start_decompress(&cinfo)) {
if ( cinfo.output_components == 3 || cinfo.output_components == 4) {
image.create( cinfo.output_width, cinfo.output_height, 32 );
} else if ( cinfo.output_components == 1 ) {
image.create( cinfo.output_width, cinfo.output_height, 8, 256 );
for (int i=0; i<256; i++)
image.setColor(i, qRgb(i,i,i));
}
#ifdef JPEG_DEBUG
qDebug("will create a picture %d/%d in size", cinfo.output_width, cinfo.output_height);
#endif
#ifdef JPEG_DEBUG
qDebug("ok, going to decompressStarted");
#endif
jsrc.decoder_timestamp.start();
state = jsrc.do_progressive ? decompressStarted : doOutputScan;
}
}
again:
if(state == decompressStarted) {
state = (!jsrc.final_pass && jsrc.decoder_timestamp.elapsed() < max_consumingtime)
? consumeInput : prepareOutputScan;
}
if(state == consumeInput)
{
int retval;
do {
retval = jpeg_consume_input(&cinfo);
} while (retval != JPEG_SUSPENDED && retval != JPEG_REACHED_EOI
&& (retval != JPEG_REACHED_SOS || jsrc.decoder_timestamp.elapsed() < max_consumingtime));
if(jsrc.decoder_timestamp.elapsed() >= max_consumingtime ||
jsrc.final_pass ||
retval == JPEG_REACHED_EOI || retval == JPEG_REACHED_SOS)
state = prepareOutputScan;
}
if(state == prepareOutputScan)
{
if ( jpeg_start_output(&cinfo, cinfo.input_scan_number) )
state = doOutputScan;
}
if(state == doOutputScan)
{
if(image.isNull() || jsrc.decoding_done)
{
#ifdef JPEG_DEBUG
qDebug("complete in doOutputscan, eating..");
#endif
return consumed;
}
uchar** lines = image.jumpTable();
int oldoutput_scanline = cinfo.output_scanline;
while(cinfo.output_scanline < cinfo.output_height &&
jpeg_read_scanlines(&cinfo, lines+cinfo.output_scanline, cinfo.output_height))
; // here happens all the magic of decoding
int completed_scanlines = cinfo.output_scanline - oldoutput_scanline;
#ifdef JPEG_DEBUG
qDebug("completed now %d scanlines", completed_scanlines);
#endif
if ( cinfo.output_components == 3 ) {
// Expand 24->32 bpp.
for (int j=oldoutput_scanline; j<oldoutput_scanline+completed_scanlines; 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(consumer && completed_scanlines)
{
QRect r(0, oldoutput_scanline, cinfo.output_width, completed_scanlines);
#ifdef JPEG_DEBUG
qDebug("changing %d/%d %d/%d", r.x(), r.y(), r.width(), r.height());
#endif
jsrc.change_rect |= r;
if ( jsrc.decoder_timestamp.elapsed() >= max_consumingtime ) {
if( !jsrc.old_change_rect.isEmpty()) {
consumer->changed(jsrc.old_change_rect);
jsrc.old_change_rect = QRect();
}
consumer->changed(jsrc.change_rect);
jsrc.change_rect = QRect();
jsrc.decoder_timestamp.restart();
}
}
if(cinfo.output_scanline >= cinfo.output_height)
{
if ( jsrc.do_progressive ) {
jpeg_finish_output(&cinfo);
jsrc.final_pass = jpeg_input_complete(&cinfo);
jsrc.decoding_done = jsrc.final_pass && cinfo.input_scan_number == cinfo.output_scan_number;
if ( !jsrc.decoding_done ) {
jsrc.old_change_rect |= jsrc.change_rect;
jsrc.change_rect = QRect();
}
}
else
jsrc.decoding_done = true;
#ifdef JPEG_DEBUG
qDebug("one pass is completed, final_pass = %d, dec_done: %d, complete: %d",
jsrc.final_pass, jsrc.decoding_done, jpeg_input_complete(&cinfo));
#endif
if(!jsrc.decoding_done)
{
#ifdef JPEG_DEBUG
qDebug("starting another one, input_scan_number is %d/%d", cinfo.input_scan_number,
cinfo.output_scan_number);
#endif
jsrc.decoder_timestamp.restart();
state = decompressStarted;
// don't return until necessary!
goto again;
}
}
if(state == doOutputScan && jsrc.decoding_done) {
#ifdef JPEG_DEBUG
qDebug("input is complete, cleaning up, returning..");
#endif
if ( consumer && !jsrc.change_rect.isEmpty() )
consumer->changed( jsrc.change_rect );
if(consumer)
consumer->end();
jsrc.ateof = true;
(void) jpeg_finish_decompress(&cinfo);
(void) jpeg_destroy_decompress(&cinfo);
state = readDone;
return 0;
}
}
#ifdef BUFFER_DEBUG
qDebug("valid_buffer_len is now %d", jsrc.valid_buffer_len);
qDebug("bytes_in_buffer is now %d", jsrc.bytes_in_buffer);
qDebug("consumed %d bytes", consumed);
#endif
if(jsrc.bytes_in_buffer && jsrc.buffer != jsrc.next_input_byte)
memmove(jsrc.buffer, jsrc.next_input_byte, jsrc.bytes_in_buffer);
jsrc.valid_buffer_len = jsrc.bytes_in_buffer;
return consumed;
}
// -----------------------------------------------------------------------------
// This is the factory that teaches Qt about progressive JPEG's
QImageFormat* khtml::KJPEGFormatType::decoderFor(const unsigned char* buffer, int length)
{
if(length < 3) return 0;
if(buffer[0] == 0377 &&
buffer[1] == 0330 &&
buffer[2] == 0377)
return new KJPEGFormat;
return 0;
}
const char* khtml::KJPEGFormatType::formatName() const
{
return "JPEG";
}
#else
#ifdef __GNUC__
#warning You don't seem to have libJPEG. jpeg support in khtml won't work
#endif
#endif // HAVE_LIBJPEG
// -----------------------------------------------------------------------------