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conv_shared.cpp
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conv_shared.cpp
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/* -*- C++ -*-
*
* conv_shared.cpp - Shared code of sarconv and nsaconv
*
* Copyright (c) 2001-2018 Ogapee. All rights reserved.
*
* ogapee@aqua.dti2.ne.jp
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
extern "C"{
#include <jpeglib.h>
};
#include <bzlib.h>
#include "resize_image.h"
int scale_ratio_upper;
int scale_ratio_lower;
unsigned char *rescaled_tmp2_buffer = NULL;
size_t rescaled_tmp2_length = 0;
unsigned char *rescaled_tmp_buffer = NULL;
size_t rescaled_tmp_length = 0;
static unsigned char *restored_buffer = NULL;
static size_t restored_length = 0;
#define INPUT_BUFFER_SIZE 4096
typedef struct {
struct jpeg_source_mgr pub;
unsigned char *buf;
size_t left;
} my_source_mgr;
typedef struct {
struct jpeg_destination_mgr pub;
unsigned char *buf;
size_t left;
} my_destination_mgr;
void rescaleImage( unsigned char *original_buffer, int width, int height, int byte_per_pixel,
bool src_pad_flag, bool dst_pad_flag, bool palette_flag )
{
size_t width_pad = 0;
if ( src_pad_flag ) width_pad = (4 - width * byte_per_pixel % 4) % 4;
size_t w = (int)(width * scale_ratio_upper / scale_ratio_lower);
size_t h = (int)(height * scale_ratio_upper / scale_ratio_lower);
if ( w==0 ) w=1;
if ( h==0 ) h=1;
size_t w_pad = 0;
if ( dst_pad_flag ) w_pad = (4 - w * byte_per_pixel % 4) % 4;
if ( (w * byte_per_pixel + w_pad) * h > rescaled_tmp_length ){
int len = (w * byte_per_pixel + w_pad) * h;
if ( rescaled_tmp_buffer ) delete[] rescaled_tmp_buffer;
rescaled_tmp_buffer = new unsigned char[ len ];
rescaled_tmp_length = len;
}
size_t len = (width * byte_per_pixel + width_pad) * (height+1) + byte_per_pixel;
if ( len<16 ) len = 16;
if ( len > rescaled_tmp2_length ){
if ( rescaled_tmp2_buffer ) delete[] rescaled_tmp2_buffer;
rescaled_tmp2_buffer = new unsigned char[ len ];
rescaled_tmp2_length = len;
}
resizeImage( rescaled_tmp_buffer, w, h, w*byte_per_pixel+w_pad,
original_buffer, width, height, width*byte_per_pixel+width_pad,
byte_per_pixel, rescaled_tmp2_buffer, width*byte_per_pixel+width_pad, palette_flag );
}
void init_source (j_decompress_ptr cinfo)
{
}
boolean fill_input_buffer (j_decompress_ptr cinfo)
{
my_source_mgr *src = (my_source_mgr *)cinfo->src;
src->pub.next_input_byte = src->buf;
src->pub.bytes_in_buffer = src->left;
return TRUE;
}
void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_source_mgr *src = (my_source_mgr *)cinfo->src;
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
void term_source (j_decompress_ptr cinfo)
{
}
void init_destination (j_compress_ptr cinfo)
{
my_destination_mgr * dest = (my_destination_mgr *) cinfo->dest;
dest->pub.next_output_byte = dest->buf;
dest->pub.free_in_buffer = dest->left;
}
boolean empty_output_buffer (j_compress_ptr cinfo)
{
my_destination_mgr * dest = (my_destination_mgr *) cinfo->dest;
dest->pub.next_output_byte = dest->buf;
dest->pub.free_in_buffer = dest->left;
return TRUE;
}
void term_destination (j_compress_ptr cinfo)
{
}
size_t rescaleJPEGWrite( unsigned int width, unsigned int height, int byte_per_pixel, unsigned char **rescaled_buffer,
int quality, bool bmp2jpeg_flag )
{
jpeg_error_mgr jerr;
struct jpeg_compress_struct cinfo2;
JSAMPROW row_pointer[1];
cinfo2.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo2);
cinfo2.dest = (struct jpeg_destination_mgr *)
(*cinfo2.mem->alloc_small) ((j_common_ptr) &cinfo2, JPOOL_PERMANENT,
sizeof(my_destination_mgr));
my_destination_mgr * dest = (my_destination_mgr *) cinfo2.dest;
dest->buf = *rescaled_buffer;
dest->left = restored_length;
dest->pub.init_destination = init_destination;
dest->pub.empty_output_buffer = empty_output_buffer;
dest->pub.term_destination = term_destination;
cinfo2.image_width = (int)(width * scale_ratio_upper / scale_ratio_lower);
if ( cinfo2.image_width == 0 ) cinfo2.image_width = 1;
cinfo2.image_height = (int)(height * scale_ratio_upper / scale_ratio_lower);
if ( cinfo2.image_height == 0 ) cinfo2.image_height = 1;
cinfo2.input_components = byte_per_pixel;
if ( cinfo2.input_components == 1 )
cinfo2.in_color_space = JCS_GRAYSCALE;
else
cinfo2.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo2);
jpeg_set_quality(&cinfo2, quality, TRUE );
cinfo2.optimize_coding = TRUE;
//jpeg_simple_progression (&cinfo2);
jpeg_start_compress(&cinfo2, TRUE);
int row_stride = cinfo2.image_width * byte_per_pixel;
while (cinfo2.next_scanline < cinfo2.image_height) {
if (bmp2jpeg_flag){
unsigned char *src = row_pointer[0] = &rescaled_tmp_buffer[(cinfo2.image_height - 1 - cinfo2.next_scanline) * row_stride];
for(unsigned int i=0 ; i<cinfo2.image_width ; i++, src+=3){
unsigned char tmp = src[2];
src[2] = src[0];
src[0] = tmp;
}
}
else{
row_pointer[0] = &rescaled_tmp_buffer[cinfo2.next_scanline * row_stride];
}
jpeg_write_scanlines(&cinfo2, row_pointer, 1);
}
jpeg_finish_compress(&cinfo2);
size_t datacount = dest->left - dest->pub.free_in_buffer;
jpeg_destroy_compress(&cinfo2);
return datacount;
}
size_t rescaleJPEG( unsigned char *original_buffer, size_t length, unsigned char **rescaled_buffer, int quality )
{
struct jpeg_decompress_struct cinfo;
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
cinfo.src = (struct jpeg_source_mgr *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof(my_source_mgr));
my_source_mgr * src = (my_source_mgr *) cinfo.src;
src->buf = original_buffer;
src->left = length;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = term_source;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
if ( cinfo.output_width * cinfo.output_height * cinfo.output_components + 0x400 > restored_length ){
restored_length = cinfo.output_width * cinfo.output_height * cinfo.output_components + 0x400;
if ( restored_buffer ) delete[] restored_buffer;
restored_buffer = new unsigned char[ restored_length ];
if ( *rescaled_buffer ) delete[] *rescaled_buffer;
*rescaled_buffer = new unsigned char[ restored_length ];
}
int row_stride = cinfo.output_width * cinfo.output_components;
JSAMPARRAY buf = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
unsigned char *buf_p = restored_buffer;
while (cinfo.output_scanline < cinfo.output_height) {
jpeg_read_scanlines(&cinfo, buf, 1);
memcpy( buf_p, buf[0], row_stride );
buf_p += cinfo.output_width * cinfo.output_components;
}
rescaleImage( restored_buffer, cinfo.output_width, cinfo.output_height, cinfo.output_components, false, false, false );
size_t datacount = rescaleJPEGWrite(cinfo.output_width, cinfo.output_height, cinfo.output_components, rescaled_buffer, quality, false);
jpeg_destroy_decompress(&cinfo);
return datacount;
}
void rescaleBMPWrite( unsigned char *original_buffer, size_t total_size, int width, int height, unsigned char **rescaled_buffer )
{
int buffer_offset = original_buffer[10] + (original_buffer[11] << 8);
memcpy( *rescaled_buffer, original_buffer, buffer_offset );
memcpy( *rescaled_buffer + buffer_offset, rescaled_tmp_buffer, total_size - buffer_offset );
*(*rescaled_buffer + 2) = total_size & 0xff;
*(*rescaled_buffer + 3) = (total_size >> 8) & 0xff;
*(*rescaled_buffer + 4) = (total_size >> 16) & 0xff;
*(*rescaled_buffer + 5) = (total_size >> 24) & 0xff;
*(*rescaled_buffer + 18) = width & 0xff;
*(*rescaled_buffer + 19) = (width >> 8) & 0xff;
*(*rescaled_buffer + 20) = (width >> 16) & 0xff;
*(*rescaled_buffer + 21) = (width >> 24) & 0xff;
*(*rescaled_buffer + 22) = height & 0xff;
*(*rescaled_buffer + 23) = (height >> 8) & 0xff;
*(*rescaled_buffer + 24) = (height >> 16) & 0xff;
*(*rescaled_buffer + 25) = (height >> 24) & 0xff;
*(*rescaled_buffer + 34) = 0;
*(*rescaled_buffer + 35) = 0;
*(*rescaled_buffer + 36) = 0;
*(*rescaled_buffer + 37) = 0;
#if 0
FILE *fp = fopen( "test.bmp", "wb" );
fwrite( *rescaled_buffer, 1, width2 * height2 * byte_per_pixel + 54 + color_num*4, fp );
fclose(fp);
getchar();
#endif
}
size_t rescaleBMP( unsigned char *original_buffer, unsigned char **rescaled_buffer,
bool output_jpeg_flag, int quality )
{
if (original_buffer[14] != 40){
if (original_buffer[14] == 12)
fprintf( stderr, " OS/2 format is not supported.\n");
else
fprintf( stderr, " this bitmap can't be handled.\n");
exit(-1);
}
int buffer_offset = original_buffer[10] + (original_buffer[11] << 8);
int width = original_buffer[18] + (original_buffer[19] << 8);
int height = original_buffer[22] + (original_buffer[23] << 8);
int bit_per_pixel = original_buffer[28];
if (bit_per_pixel == 1 || bit_per_pixel == 4){
fprintf( stderr, " bit_per_pixel %d is not supported.\n", bit_per_pixel);
exit(-1);
}
int byte_per_pixel = bit_per_pixel / 8;
int color_num = original_buffer[46] + ((int)original_buffer[47] << 8) + (original_buffer[48] << 16) + (original_buffer[49] << 24);
if (bit_per_pixel == 8 && color_num == 0) color_num = 256;
bool palette_flag = false;
if (bit_per_pixel == 8) palette_flag = true;
if (palette_flag) output_jpeg_flag = false;
size_t width2 = (int)(width * scale_ratio_upper / scale_ratio_lower);
if ( width2 == 0 ) width2 = 1;
size_t width2_pad = (4 - width2 * byte_per_pixel % 4) % 4;
size_t height2 = (int)(height * scale_ratio_upper / scale_ratio_lower);
if ( height2 == 0 ) height2 = 1;
size_t total_size = (width2 * byte_per_pixel + width2_pad) * height2 + buffer_offset;
if ( total_size+0x400 > restored_length ){
restored_length = total_size+0x400;
if ( restored_buffer ) delete[] restored_buffer;
restored_buffer = new unsigned char[ restored_length ];
if ( *rescaled_buffer ) delete[] *rescaled_buffer;
*rescaled_buffer = new unsigned char[ restored_length ];
}
if (output_jpeg_flag){
rescaleImage( original_buffer+buffer_offset, width, height, byte_per_pixel, true, false, palette_flag );
total_size = rescaleJPEGWrite(width, height, byte_per_pixel, rescaled_buffer, quality, true);
}
else {
rescaleImage( original_buffer+buffer_offset, width, height, byte_per_pixel, true, true, palette_flag );
rescaleBMPWrite(original_buffer, total_size, width2, height2, rescaled_buffer);
}
return total_size;
}