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minidlna/image_utils.c
Justin Maggard c29a9cf52b image: Support rotation of monochrome JPEGs. 
Extends the existing 90°-increment rotation support
(i.e. /Resized/ID?rotation=DEG) to monochrome JPEGs.

SF Patch #135 (Thanks R.L. Horn).
2015-07-30 15:53:15 -07:00

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/* MiniDLNA media server
* Copyright (C) 2009 Justin Maggard
*
* This file is part of MiniDLNA.
*
* MiniDLNA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* MiniDLNA 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 MiniDLNA. If not, see <http://www.gnu.org/licenses/>.
*/
/* These functions are mostly based on code from other projects.
* There are function to effiently resize a JPEG image, and some utility functions.
* They are here to allow loading and saving JPEG data directly to or from memory with libjpeg.
* The standard functions only allow you to read from or write to a file.
*
* The reading code comes from the JpgAlleg library, at http://wiki.allegro.cc/index.php?title=Libjpeg
* The writing code was posted on a Google group from openjpeg, at http://groups.google.com/group/openjpeg/browse_thread/thread/331e6cf60f70797f
* The resize functions come from the resize_image project, at http://www.golac.fr/Image-Resizer
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <setjmp.h>
#include <jpeglib.h>
#ifdef HAVE_MACHINE_ENDIAN_H
#include <machine/endian.h>
#else
#include <endian.h>
#endif
#include "upnpreplyparse.h"
#include "image_utils.h"
#include "log.h"
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define SWAP16(w) ( (((w) >> 8) & 0x00ff) | (((w) << 8) & 0xff00) )
#else
# define SWAP16(w) (w)
#endif
#define JPEG_QUALITY 96
#define COL(red, green, blue) (((red) << 24) | ((green) << 16) | ((blue) << 8) | 0xFF)
#define COL_FULL(red, green, blue, alpha) (((red) << 24) | ((green) << 16) | ((blue) << 8) | (alpha))
#define COL_RED(col) (col >> 24)
#define COL_GREEN(col) ((col >> 16) & 0xFF)
#define COL_BLUE(col) ((col >> 8) & 0xFF)
#define COL_ALPHA(col) (col & 0xFF)
#define BLACK 0x000000FF
struct my_dst_mgr {
struct jpeg_destination_mgr jdst;
JOCTET *buf;
JOCTET *off;
size_t sz;
size_t used;
};
/* Destination manager to store data in a buffer */
static void
my_dst_mgr_init(j_compress_ptr cinfo)
{
struct my_dst_mgr *dst = (void *)cinfo->dest;
dst->used = 0;
dst->sz = cinfo->image_width
* cinfo->image_height
* cinfo->input_components;
dst->buf = malloc(dst->sz * sizeof *dst->buf);
dst->off = dst->buf;
dst->jdst.next_output_byte = dst->off;
dst->jdst.free_in_buffer = dst->sz;
return;
}
static boolean
my_dst_mgr_empty(j_compress_ptr cinfo)
{
struct my_dst_mgr *dst = (void *)cinfo->dest;
dst->sz *= 2;
dst->used = dst->off - dst->buf;
dst->buf = realloc(dst->buf, dst->sz * sizeof *dst->buf);
dst->off = dst->buf + dst->used;
dst->jdst.next_output_byte = dst->off;
dst->jdst.free_in_buffer = dst->sz - dst->used;
return TRUE;
}
static void
my_dst_mgr_term(j_compress_ptr cinfo)
{
struct my_dst_mgr *dst = (void *)cinfo->dest;
dst->used += dst->sz - dst->jdst.free_in_buffer;
dst->off = dst->buf + dst->used;
return;
}
static void
jpeg_memory_dest(j_compress_ptr cinfo, struct my_dst_mgr *dst)
{
dst->jdst.init_destination = my_dst_mgr_init;
dst->jdst.empty_output_buffer = my_dst_mgr_empty;
dst->jdst.term_destination = my_dst_mgr_term;
cinfo->dest = (void *)dst;
return;
}
/* Source manager to read data from a buffer */
struct
my_src_mgr
{
struct jpeg_source_mgr pub;
JOCTET eoi_buffer[2];
};
static void
init_source(j_decompress_ptr cinfo)
{
return;
}
static int
fill_input_buffer(j_decompress_ptr cinfo)
{
struct my_src_mgr *src = (void *)cinfo->src;
/* Create a fake EOI marker */
src->eoi_buffer[0] = (JOCTET) 0xFF;
src->eoi_buffer[1] = (JOCTET) JPEG_EOI;
src->pub.next_input_byte = src->eoi_buffer;
src->pub.bytes_in_buffer = 2;
return TRUE;
}
static void
skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
struct my_src_mgr *src = (void *)cinfo->src;
if (num_bytes > 0)
{
while (num_bytes > (long)src->pub.bytes_in_buffer)
{
num_bytes -= (long)src->pub.bytes_in_buffer;
fill_input_buffer(cinfo);
}
}
src->pub.next_input_byte += num_bytes;
src->pub.bytes_in_buffer -= num_bytes;
}
static void
term_source(j_decompress_ptr cinfo)
{
return;
}
void
jpeg_memory_src(j_decompress_ptr cinfo, const unsigned char * buffer, size_t bufsize)
{
struct my_src_mgr *src;
if (!cinfo->src)
cinfo->src = (*cinfo->mem->alloc_small)((void *)cinfo, JPOOL_PERMANENT, sizeof(struct my_src_mgr));;
src = (void *)cinfo->src;
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.next_input_byte = buffer;
src->pub.bytes_in_buffer = bufsize;
}
jmp_buf setjmp_buffer;
/* Don't exit on error like libjpeg likes to do */
static void
libjpeg_error_handler(j_common_ptr cinfo)
{
cinfo->err->output_message(cinfo);
longjmp(setjmp_buffer, 1);
return;
}
void
image_free(image_s *pimage)
{
free(pimage->buf);
free(pimage);
}
pix
get_pix(image_s *pimage, int32_t x, int32_t y)
{
if (x < 0)
x = 0;
else if (x >= pimage->width)
x = pimage->width - 1;
if (y < 0)
y = 0;
else if (y >= pimage->height)
y = pimage->height - 1;
return(pimage->buf[(y * pimage->width) + x]);
}
void
put_pix_alpha_replace(image_s *pimage, int32_t x, int32_t y, pix col)
{
if((x >= 0) && (y >= 0) && (x < pimage->width) && (y < pimage->height))
pimage->buf[(y * pimage->width) + x] = col;
}
int
image_get_jpeg_resolution(const char * path, int * width, int * height)
{
FILE *img;
unsigned char buf[8];
uint16_t offset, h, w;
int ret = 1;
size_t nread;
long size;
img = fopen(path, "r");
if( !img )
return -1;
fseek(img, 0, SEEK_END);
size = ftell(img);
rewind(img);
nread = fread(&buf, 2, 1, img);
if( (nread < 1) || (buf[0] != 0xFF) || (buf[1] != 0xD8) )
{
fclose(img);
return -1;
}
memset(&buf, 0, sizeof(buf));
while( ftell(img) < size )
{
while( nread > 0 && buf[0] != 0xFF && !feof(img) )
nread = fread(&buf, 1, 1, img);
while( nread > 0 && buf[0] == 0xFF && !feof(img) )
nread = fread(&buf, 1, 1, img);
if( (buf[0] >= 0xc0) && (buf[0] <= 0xc3) )
{
nread = fread(&buf, 7, 1, img);
*width = 0;
*height = 0;
if( nread < 1 )
break;
memcpy(&h, buf+3, 2);
*height = SWAP16(h);
memcpy(&w, buf+5, 2);
*width = SWAP16(w);
ret = 0;
break;
}
else
{
offset = 0;
nread = fread(&buf, 2, 1, img);
if( nread < 1 )
break;
memcpy(&offset, buf, 2);
offset = SWAP16(offset) - 2;
if( fseek(img, offset, SEEK_CUR) == -1 )
break;
}
}
fclose(img);
return ret;
}
int
image_get_jpeg_date_xmp(const char * path, char ** date)
{
FILE *img;
unsigned char buf[8];
char *data = NULL, *newdata;
uint16_t offset;
struct NameValueParserData xml;
char * exif;
int ret = 1;
size_t nread;
img = fopen(path, "r");
if( !img )
return(-1);
nread = fread(&buf, 2, 1, img);
if( (nread < 1) || (buf[0] != 0xFF) || (buf[1] != 0xD8) )
{
fclose(img);
return(-1);
}
memset(&buf, 0, sizeof(buf));
while( !feof(img) )
{
while( nread > 0 && buf[0] != 0xFF && !feof(img) )
nread = fread(&buf, 1, 1, img);
while( nread > 0 && buf[0] == 0xFF && !feof(img) )
nread = fread(&buf, 1, 1, img);
if( feof(img) )
break;
if( buf[0] == 0xE1 ) // APP1 marker
{
offset = 0;
nread = fread(&buf, 2, 1, img);
if( nread < 1 )
break;
memcpy(&offset, buf, 2);
offset = SWAP16(offset) - 2;
if( offset < 30 )
{
fseek(img, offset, SEEK_CUR);
continue;
}
newdata = realloc(data, 30);
if( !newdata )
break;
data = newdata;
nread = fread(data, 29, 1, img);
if( nread < 1 )
break;
offset -= 29;
if( strcmp(data, "http://ns.adobe.com/xap/1.0/") != 0 )
{
fseek(img, offset, SEEK_CUR);
continue;
}
newdata = realloc(data, offset+1);
if( !newdata )
break;
data = newdata;
nread = fread(data, offset, 1, img);
if( nread < 1 )
break;
ParseNameValue(data, offset, &xml, 0);
exif = GetValueFromNameValueList(&xml, "DateTimeOriginal");
if( !exif )
{
ClearNameValueList(&xml);
break;
}
*date = realloc(*date, strlen(exif)+1);
strcpy(*date, exif);
ClearNameValueList(&xml);
ret = 0;
break;
}
else
{
offset = 0;
nread = fread(&buf, 2, 1, img);
if( nread < 1 )
break;
memcpy(&offset, buf, 2);
offset = SWAP16(offset) - 2;
fseek(img, offset, SEEK_CUR);
}
}
fclose(img);
free(data);
return ret;
}
image_s *
image_new(int32_t width, int32_t height)
{
image_s *vimage;
if((vimage = (image_s *)malloc(sizeof(image_s))) == NULL)
{
DPRINTF(E_WARN, L_METADATA, "malloc failed\n");
return NULL;
}
vimage->width = width; vimage->height = height;
if((vimage->buf = (pix *)malloc(width * height * sizeof(pix))) == NULL)
{
DPRINTF(E_WARN, L_METADATA, "malloc failed\n");
free(vimage);
return NULL;
}
return(vimage);
}
image_s *
image_new_from_jpeg(const char *path, int is_file, const uint8_t *buf, int size, int scale, int rotate)
{
image_s *vimage;
FILE *file = NULL;
struct jpeg_decompress_struct cinfo;
unsigned char *line[16], *ptr;
int x, y, i, w, h, ofs;
int maxbuf;
struct jpeg_error_mgr pub;
cinfo.err = jpeg_std_error(&pub);
pub.error_exit = libjpeg_error_handler;
jpeg_create_decompress(&cinfo);
if( is_file )
{
if( (file = fopen(path, "r")) == NULL )
{
return NULL;
}
jpeg_stdio_src(&cinfo, file);
}
else
{
jpeg_memory_src(&cinfo, buf, size);
}
if( setjmp(setjmp_buffer) )
{
jpeg_destroy_decompress(&cinfo);
if( is_file && file )
fclose(file);
return NULL;
}
jpeg_read_header(&cinfo, TRUE);
cinfo.scale_denom = scale;
cinfo.do_fancy_upsampling = FALSE;
cinfo.do_block_smoothing = FALSE;
cinfo.dct_method = JDCT_IFAST;
jpeg_start_decompress(&cinfo);
w = cinfo.output_width;
h = cinfo.output_height;
vimage = (rotate & (ROTATE_90|ROTATE_270)) ? image_new(h, w) : image_new(w, h);
if(!vimage)
{
jpeg_destroy_decompress(&cinfo);
if( is_file )
fclose(file);
return NULL;
}
if( setjmp(setjmp_buffer) )
{
jpeg_destroy_decompress(&cinfo);
if( is_file && file )
fclose(file);
if( vimage )
{
free(vimage->buf);
free(vimage);
}
return NULL;
}
if(cinfo.rec_outbuf_height > 16)
{
DPRINTF(E_WARN, L_METADATA, "ERROR image_from_jpeg : (image_from_jpeg.c) JPEG uses line buffers > 16. Cannot load.\n");
jpeg_destroy_decompress(&cinfo);
image_free(vimage);
if( is_file )
fclose(file);
return NULL;
}
maxbuf = vimage->width * vimage->height;
if(cinfo.output_components == 3)
{
int rx, ry;
ofs = 0;
if((ptr = malloc(w * 3 * cinfo.rec_outbuf_height + 16)) == NULL)
{
DPRINTF(E_WARN, L_METADATA, "malloc failed\n");
jpeg_destroy_decompress(&cinfo);
image_free(vimage);
if( is_file )
fclose(file);
return NULL;
}
for(y = 0; y < h; y += cinfo.rec_outbuf_height)
{
ry = (rotate & (ROTATE_90|ROTATE_180)) ? (y - h + 1) * -1 : y;
for(i = 0; i < cinfo.rec_outbuf_height; i++)
{
line[i] = ptr + (w * 3 * i);
}
jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height);
for(x = 0; x < w * cinfo.rec_outbuf_height; x++)
{
rx = (rotate & (ROTATE_180|ROTATE_270)) ? (x - w + 1) * -1 : x;
ofs = (rotate & (ROTATE_90|ROTATE_270)) ? ry + (rx * h) : rx + (ry * w);
if( ofs < maxbuf )
vimage->buf[ofs] = COL(ptr[x + x + x], ptr[x + x + x + 1], ptr[x + x + x + 2]);
}
}
free(ptr);
}
else if(cinfo.output_components == 1)
{
int rx, ry;
ofs = 0;
for(i = 0; i < cinfo.rec_outbuf_height; i++)
{
if((line[i] = malloc(w)) == NULL)
{
int t = 0;
for(t = 0; t < i; t++) free(line[t]);
jpeg_destroy_decompress(&cinfo);
image_free(vimage);
if( is_file )
fclose(file);
return NULL;
}
}
for(y = 0; y < h; y += cinfo.rec_outbuf_height)
{
ry = (rotate & (ROTATE_90|ROTATE_180)) ? (y - h + 1) * -1 : y;
jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height);
for(i = 0; i < cinfo.rec_outbuf_height; i++)
{
for(x = 0; x < w; x++)
{
rx = (rotate & (ROTATE_180|ROTATE_270)) ?
(x - w + 1) * -1 : x;
ofs = (rotate & (ROTATE_90|ROTATE_270)) ?
ry + (rx * h) : rx + (ry * w);
if( ofs < maxbuf )
vimage->buf[ofs] =
COL(line[i][x], line[i][x], line[i][x]);
}
}
}
for(i = 0; i < cinfo.rec_outbuf_height; i++)
{
free(line[i]);
}
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
if( is_file )
fclose(file);
return vimage;
}
void
image_upsize(image_s * pdest, image_s * psrc, int32_t width, int32_t height)
{
int32_t vx, vy;
#if !defined __i386__ && !defined __x86_64__
int32_t rx, ry;
pix vcol;
if((pdest == NULL) || (psrc == NULL))
return;
for(vy = 0; vy < height; vy++)
{
for(vx = 0; vx < width; vx++)
{
rx = ((vx * psrc->width) / width);
ry = ((vy * psrc->height) / height);
vcol = get_pix(psrc, rx, ry);
#else
pix vcol,vcol1,vcol2,vcol3,vcol4;
float rx,ry;
float width_scale, height_scale;
float x_dist, y_dist;
width_scale = (float)psrc->width / (float)width;
height_scale = (float)psrc->height / (float)height;
for(vy = 0;vy < height; vy++)
{
for(vx = 0;vx < width; vx++)
{
rx = vx * width_scale;
ry = vy * height_scale;
vcol1 = get_pix(psrc, (int32_t)rx, (int32_t)ry);
vcol2 = get_pix(psrc, ((int32_t)rx)+1, (int32_t)ry);
vcol3 = get_pix(psrc, (int32_t)rx, ((int32_t)ry)+1);
vcol4 = get_pix(psrc, ((int32_t)rx)+1, ((int32_t)ry)+1);
x_dist = rx - ((float)((int32_t)rx));
y_dist = ry - ((float)((int32_t)ry));
vcol = COL_FULL( (uint8_t)((COL_RED(vcol1)*(1.0-x_dist)
+ COL_RED(vcol2)*(x_dist))*(1.0-y_dist)
+ (COL_RED(vcol3)*(1.0-x_dist)
+ COL_RED(vcol4)*(x_dist))*(y_dist)),
(uint8_t)((COL_GREEN(vcol1)*(1.0-x_dist)
+ COL_GREEN(vcol2)*(x_dist))*(1.0-y_dist)
+ (COL_GREEN(vcol3)*(1.0-x_dist)
+ COL_GREEN(vcol4)*(x_dist))*(y_dist)),
(uint8_t)((COL_BLUE(vcol1)*(1.0-x_dist)
+ COL_BLUE(vcol2)*(x_dist))*(1.0-y_dist)
+ (COL_BLUE(vcol3)*(1.0-x_dist)
+ COL_BLUE(vcol4)*(x_dist))*(y_dist)),
(uint8_t)((COL_ALPHA(vcol1)*(1.0-x_dist)
+ COL_ALPHA(vcol2)*(x_dist))*(1.0-y_dist)
+ (COL_ALPHA(vcol3)*(1.0-x_dist)
+ COL_ALPHA(vcol4)*(x_dist))*(y_dist))
);
#endif
put_pix_alpha_replace(pdest, vx, vy, vcol);
}
}
}
void
image_downsize(image_s * pdest, image_s * psrc, int32_t width, int32_t height)
{
int32_t vx, vy;
pix vcol;
int32_t i, j;
#if !defined __i386__ && !defined __x86_64__
int32_t rx, ry, rx_next, ry_next;
int red, green, blue, alpha;
int factor;
if((pdest == NULL) || (psrc == NULL))
return;
for(vy = 0; vy < height; vy++)
{
for(vx = 0; vx < width; vx++)
{
rx = ((vx * psrc->width) / width);
ry = ((vy * psrc->height) / height);
red = green = blue = alpha = 0;
rx_next = rx + (psrc->width / width);
ry_next = ry + (psrc->width / width);
factor = 0;
for( j = rx; j < rx_next; j++)
{
for( i = ry; i < ry_next; i++)
{
factor += 1;
vcol = get_pix(psrc, j, i);
red += COL_RED(vcol);
green += COL_GREEN(vcol);
blue += COL_BLUE(vcol);
alpha += COL_ALPHA(vcol);
}
}
red /= factor;
green /= factor;
blue /= factor;
alpha /= factor;
/* on sature les valeurs */
red = (red > 255) ? 255 : ((red < 0) ? 0 : red );
green = (green > 255) ? 255 : ((green < 0) ? 0 : green);
blue = (blue > 255) ? 255 : ((blue < 0) ? 0 : blue );
alpha = (alpha > 255) ? 255 : ((alpha < 0) ? 0 : alpha);
#else
float rx,ry;
float width_scale, height_scale;
float red, green, blue, alpha;
int32_t half_square_width, half_square_height;
float round_width, round_height;
if( (pdest == NULL) || (psrc == NULL) )
return;
width_scale = (float)psrc->width / (float)width;
height_scale = (float)psrc->height / (float)height;
half_square_width = (int32_t)(width_scale / 2.0);
half_square_height = (int32_t)(height_scale / 2.0);
round_width = (width_scale / 2.0) - (float)half_square_width;
round_height = (height_scale / 2.0) - (float)half_square_height;
if(round_width > 0.0)
half_square_width++;
else
round_width = 1.0;
if(round_height > 0.0)
half_square_height++;
else
round_height = 1.0;
for(vy = 0;vy < height; vy++)
{
for(vx = 0;vx < width; vx++)
{
rx = vx * width_scale;
ry = vy * height_scale;
vcol = get_pix(psrc, (int32_t)rx, (int32_t)ry);
red = green = blue = alpha = 0.0;
for(j=0;j<half_square_height<<1;j++)
{
for(i=0;i<half_square_width<<1;i++)
{
vcol = get_pix(psrc, ((int32_t)rx)-half_square_width+i,
((int32_t)ry)-half_square_height+j);
if(((j == 0) || (j == (half_square_height<<1)-1)) &&
((i == 0) || (i == (half_square_width<<1)-1)))
{
red += round_width*round_height*(float)COL_RED (vcol);
green += round_width*round_height*(float)COL_GREEN(vcol);
blue += round_width*round_height*(float)COL_BLUE (vcol);
alpha += round_width*round_height*(float)COL_ALPHA(vcol);
}
else if((j == 0) || (j == (half_square_height<<1)-1))
{
red += round_height*(float)COL_RED (vcol);
green += round_height*(float)COL_GREEN(vcol);
blue += round_height*(float)COL_BLUE (vcol);
alpha += round_height*(float)COL_ALPHA(vcol);
}
else if((i == 0) || (i == (half_square_width<<1)-1))
{
red += round_width*(float)COL_RED (vcol);
green += round_width*(float)COL_GREEN(vcol);
blue += round_width*(float)COL_BLUE (vcol);
alpha += round_width*(float)COL_ALPHA(vcol);
}
else
{
red += (float)COL_RED (vcol);
green += (float)COL_GREEN(vcol);
blue += (float)COL_BLUE (vcol);
alpha += (float)COL_ALPHA(vcol);
}
}
}
red /= width_scale*height_scale;
green /= width_scale*height_scale;
blue /= width_scale*height_scale;
alpha /= width_scale*height_scale;
/* on sature les valeurs */
red = (red > 255.0)? 255.0 : ((red < 0.0)? 0.0:red );
green = (green > 255.0)? 255.0 : ((green < 0.0)? 0.0:green);
blue = (blue > 255.0)? 255.0 : ((blue < 0.0)? 0.0:blue );
alpha = (alpha > 255.0)? 255.0 : ((alpha < 0.0)? 0.0:alpha);
#endif
put_pix_alpha_replace(pdest, vx, vy,
COL_FULL((uint8_t)red, (uint8_t)green, (uint8_t)blue, (uint8_t)alpha));
}
}
}
image_s *
image_resize(image_s * src_image, int32_t width, int32_t height)
{
image_s * dst_image;
dst_image = image_new(width, height);
if( !dst_image )
return NULL;
if( (src_image->width < width) || (src_image->height < height) )
image_upsize(dst_image, src_image, width, height);
else
image_downsize(dst_image, src_image, width, height);
return dst_image;
}
unsigned char *
image_save_to_jpeg_buf(image_s * pimage, int * size)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW row_pointer[1];
int row_stride;
char *data;
int i, x;
struct my_dst_mgr dst;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_memory_dest(&cinfo, &dst);
cinfo.image_width = pimage->width;
cinfo.image_height = pimage->height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, JPEG_QUALITY, TRUE);
jpeg_start_compress(&cinfo, TRUE);
row_stride = cinfo.image_width * 3;
if((data = malloc(row_stride)) == NULL)
{
DPRINTF(E_WARN, L_METADATA, "malloc failed\n");
free(dst.buf);
jpeg_destroy_compress(&cinfo);
return NULL;
}
i = 0;
while(cinfo.next_scanline < cinfo.image_height)
{
for(x = 0; x < pimage->width; x++)
{
data[x * 3] = COL_RED(pimage->buf[i]);
data[x * 3 + 1] = COL_GREEN(pimage->buf[i]);
data[x * 3 + 2] = COL_BLUE(pimage->buf[i]);
i++;
}
row_pointer[0] = (unsigned char *)data;
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
*size = dst.used;
free(data);
jpeg_destroy_compress(&cinfo);
return dst.buf;
}
char *
image_save_to_jpeg_file(image_s * pimage, char * path)
{
int nwritten, size = 0;
unsigned char * buf;
FILE * dst_file;
buf = image_save_to_jpeg_buf(pimage, &size);
if( !buf )
return NULL;
dst_file = fopen(path, "w");
if( !dst_file )
{
free(buf);
return NULL;
}
nwritten = fwrite(buf, 1, size, dst_file);
fclose(dst_file);
free(buf);
return (nwritten == size) ? path : NULL;
}
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