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#include <config.h>
#include <setjmp.h>
#include "gdk_imlib.h"
#include "gdk_imlib_private.h"
#ifdef HAVE_LIBJPEG
#include <jpeglib.h>
/**
* This error handling is broken beyond belief, but oh well it works
**/
struct ImLib_JPEG_error_mgr
{
struct jpeg_error_mgr pub;
sigjmp_buf setjmp_buffer;
};
typedef struct ImLib_JPEG_error_mgr *emptr;
static void
g_JPEGFatalErrorHandler(j_common_ptr cinfo)
{
/* FIXME:
* We should somehow signal what error occurred to the caller so the
* caller can handle the error message */
emptr errmgr;
errmgr = (emptr) cinfo->err;
cinfo->err->output_message(cinfo);
siglongjmp(errmgr->setjmp_buffer, 1);
return;
}
unsigned char *
loader_jpeg (FILE * f, int *w, int *h, int *t)
{
struct jpeg_decompress_struct cinfo;
struct ImLib_JPEG_error_mgr jerr;
unsigned char *data, *line[16], *ptr;
int x, y, i;
*t = 0;
cinfo.err = jpeg_std_error(&(jerr.pub));
jerr.pub.error_exit = g_JPEGFatalErrorHandler;
/* error handler to longjmp to, we want to preserve signals */
if (sigsetjmp(jerr.setjmp_buffer, 1))
{
/* Whoops there was a jpeg error */
jpeg_destroy_decompress(&cinfo);
return NULL;
}
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, f);
jpeg_read_header(&cinfo, TRUE);
cinfo.do_fancy_upsampling = FALSE;
cinfo.do_block_smoothing = FALSE;
jpeg_start_decompress(&cinfo);
*w = cinfo.output_width;
*h = cinfo.output_height;
data = _gdk_malloc_image(*w, *h);
if (!data)
{
jpeg_destroy_decompress(&cinfo);
return NULL;
}
ptr = data;
if (cinfo.rec_outbuf_height > 16)
{
fprintf(stderr, "gdk_imlib ERROR: JPEG uses line buffers > 16. Cannot load.\n");
return NULL;
}
if (cinfo.output_components == 3)
{
for (y = 0; y < *h; y += cinfo.rec_outbuf_height)
{
for (i = 0; i < cinfo.rec_outbuf_height; i++)
{
line[i] = ptr;
ptr += *w * 3;
}
jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height);
}
}
else if (cinfo.output_components == 1)
{
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);
return NULL;
}
}
for (y = 0; y < *h; y += cinfo.rec_outbuf_height)
{
jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height);
for (i = 0; i < cinfo.rec_outbuf_height; i++)
{
for (x = 0; x < *w; x++)
{
*ptr++ = line[i][x];
*ptr++ = line[i][x];
*ptr++ = line[i][x];
}
}
}
for (i = 0; i < cinfo.rec_outbuf_height; i++)
free(line[i]);
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return data;
}
gint
saver_jpeg (GdkImlibImage *im, char *file, GdkImlibSaveInfo *info)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW row_pointer[1];
int row_stride;
FILE *f;
f = fopen(file, "wb");
if (f)
{
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, f);
cinfo.image_width = im->rgb_width;
cinfo.image_height = im->rgb_height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, (100 * info->quality) >> 8, TRUE);
jpeg_start_compress(&cinfo, TRUE);
row_stride = cinfo.image_width * 3;
while (cinfo.next_scanline < cinfo.image_height)
{
row_pointer[0] = im->rgb_data + (cinfo.next_scanline * row_stride);
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
fclose(f);
return 1;
}
return 0;
}
#else
unsigned char *
loader_jpeg (FILE * f, int *w, int *h, int *t)
{
return NULL;
}
gint
saver_jpeg (GdkImlibImage *im, char *file, GdkImlibSaveInfo *info)
{
return 0;
}
#endif
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