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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "decode.h"
#ifdef G_OS_WIN32
/* We need some hacks to avoid warnings from the jpeg headers, ex: */
/* #define HAVE_BOOLEAN */
#define XMD_H
/* #undef FAR */
/* but they are not compatible: uchar vs int........!@@(#$$??!@! */
/* fix this with UGLY HACK! */
/* #define boolean spice_jpeg_boolean */
/* #define INT32 spice_jpeg_int32 */
#endif
#include <stdio.h>
#include <jpeglib.h>
typedef struct GlibJpegDecoder
{
SpiceJpegDecoder base;
struct jpeg_decompress_struct _cinfo;
struct jpeg_error_mgr _jerr;
struct jpeg_source_mgr _jsrc;
uint8_t* _data;
int _data_size;
int _width;
int _height;
} GlibJpegDecoder;
static void begin_decode(SpiceJpegDecoder *decoder,
uint8_t* data, int data_size,
int* out_width, int* out_height)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
g_return_if_fail(data != NULL);
g_return_if_fail(data_size != 0);
if (d->_data)
jpeg_abort_decompress(&d->_cinfo);
d->_data = data;
d->_data_size = data_size;
d->_cinfo.src->next_input_byte = d->_data;
d->_cinfo.src->bytes_in_buffer = d->_data_size;
jpeg_read_header(&d->_cinfo, TRUE);
d->_cinfo.out_color_space = JCS_RGB;
d->_width = d->_cinfo.image_width;
d->_height = d->_cinfo.image_height;
*out_width = d->_width;
*out_height = d->_height;
}
/* TODO: move it elsewhere and reuse it in get_pixbuf(), optimize? */
typedef void (*converter_rgb_t)(uint8_t* src, uint8_t* dest, int width);
static void convert_rgb_to_bgr(uint8_t* src, uint8_t* dest, int width)
{
int x;
for (x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
src += 3;
}
}
static void convert_rgb_to_bgrx(uint8_t* src, uint8_t* dest, int width)
{
int x;
for (x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
*dest++ = 0;
src += 3;
}
}
static void decode(SpiceJpegDecoder *decoder,
uint8_t* dest, int stride, int format)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
uint8_t* scan_line = g_alloca(d->_width * 3);
converter_rgb_t converter = NULL;
int row;
switch (format) {
case SPICE_BITMAP_FMT_24BIT:
converter = convert_rgb_to_bgr;
break;
case SPICE_BITMAP_FMT_32BIT:
converter = convert_rgb_to_bgrx;
break;
default:
g_warning("bad bitmap format, %d", format);
return;
}
g_return_if_fail(converter != NULL);
jpeg_start_decompress(&d->_cinfo);
for (row = 0; row < d->_height; row++) {
jpeg_read_scanlines(&d->_cinfo, &scan_line, 1);
converter(scan_line, dest, d->_width);
dest += stride;
}
jpeg_finish_decompress(&d->_cinfo);
}
static SpiceJpegDecoderOps jpeg_decoder_ops = {
.begin_decode = begin_decode,
.decode = decode,
};
static void jpeg_decoder_init_source(j_decompress_ptr cinfo)
{
}
static boolean jpeg_decoder_fill_input_buffer(j_decompress_ptr cinfo)
{
g_warning("no more data for jpeg");
return FALSE;
}
static void jpeg_decoder_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
g_return_if_fail(num_bytes < (long)cinfo->src->bytes_in_buffer);
cinfo->src->next_input_byte += num_bytes;
cinfo->src->bytes_in_buffer -= num_bytes;
}
static void jpeg_decoder_term_source (j_decompress_ptr cinfo)
{
return;
}
SpiceJpegDecoder *jpeg_decoder_new(void)
{
GlibJpegDecoder *d = g_new0(GlibJpegDecoder, 1);
d->_cinfo.err = jpeg_std_error(&d->_jerr);
jpeg_create_decompress(&d->_cinfo);
d->_cinfo.src = &d->_jsrc;
d->_cinfo.src->init_source = jpeg_decoder_init_source;
d->_cinfo.src->fill_input_buffer = jpeg_decoder_fill_input_buffer;
d->_cinfo.src->skip_input_data = jpeg_decoder_skip_input_data;
d->_cinfo.src->resync_to_restart = jpeg_resync_to_restart;
d->_cinfo.src->term_source = jpeg_decoder_term_source;
d->base.ops = &jpeg_decoder_ops;
return &d->base;
}
void jpeg_decoder_destroy(SpiceJpegDecoder *decoder)
{
GlibJpegDecoder *d = SPICE_CONTAINEROF(decoder, GlibJpegDecoder, base);
jpeg_destroy_decompress(&d->_cinfo);
free(d);
}
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