static gboolean
gdk_pixbuf__jpeg_image_load_lines (JpegProgContext *context,
GError **error)
{
struct jpeg_decompress_struct *cinfo = &context->cinfo;
guchar *lines[4];
guchar **lptr;
guchar *rowptr;
gint nlines, i;
/* keep going until we've done all scanlines */
while (cinfo->output_scanline < cinfo->output_height) {
lptr = lines;
rowptr = context->dptr;
for (i=0; i < cinfo->rec_outbuf_height; i++) {
*lptr++ = rowptr;
rowptr += context->pixbuf->rowstride;
}
nlines = jpeg_read_scanlines (cinfo, lines,
cinfo->rec_outbuf_height);
if (nlines == 0)
break;
switch (cinfo->out_color_space) {
case JCS_GRAYSCALE:
explode_gray_into_buf (cinfo, lines);
break;
case JCS_RGB:
/* do nothing */
break;
case JCS_CMYK:
convert_cmyk_to_rgb (cinfo, lines);
break;
default:
if (error && *error == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Unsupported JPEG color space (%s)"),
colorspace_name (cinfo->out_color_space));
}
return FALSE;
}
context->dptr += nlines * context->pixbuf->rowstride;
/* send updated signal */
if (context->updated_func)
(* context->updated_func) (context->pixbuf,
0,
cinfo->output_scanline - 1,
cinfo->image_width,
nlines,
context->user_data);
}
return TRUE;
}
/*
* context - from image_begin_load
* buf - new image data
* size - length of new image data
*
* append image data onto inrecrementally built output image
*/
gboolean
gdk_pixbuf__jpeg_image_load_increment (gpointer data, guchar *buf, guint size)
{
JpegProgContext *context = (JpegProgContext *)data;
struct jpeg_decompress_struct *cinfo;
my_src_ptr src;
guint num_left, num_copy;
guint last_bytes_left;
guint spinguard;
gboolean first;
const guchar *bufhd;
g_return_val_if_fail (context != NULL, FALSE);
g_return_val_if_fail (buf != NULL, FALSE);
src = (my_src_ptr) context->cinfo.src;
cinfo = &context->cinfo;
/* check for fatal error */
if (sigsetjmp (context->jerr.setjmp_buffer, 1)) {
return FALSE;
}
/* skip over data if requested, handle unsigned int sizes cleanly */
/* only can happen if we've already called jpeg_get_header once */
if (context->src_initialized && src->skip_next) {
if (src->skip_next > size) {
src->skip_next -= size;
return TRUE;
} else {
num_left = size - src->skip_next;
bufhd = buf + src->skip_next;
src->skip_next = 0;
}
} else {
num_left = size;
bufhd = buf;
}
if (num_left == 0)
return TRUE;
last_bytes_left = 0;
spinguard = 0;
first = TRUE;
while (TRUE) {
/* handle any data from caller we haven't processed yet */
if (num_left > 0) {
if(src->pub.bytes_in_buffer &&
src->pub.next_input_byte != src->buffer)
memmove(src->buffer, src->pub.next_input_byte,
src->pub.bytes_in_buffer);
num_copy = MIN (JPEG_PROG_BUF_SIZE - src->pub.bytes_in_buffer,
num_left);
memcpy(src->buffer + src->pub.bytes_in_buffer, bufhd,num_copy);
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer += num_copy;
bufhd += num_copy;
num_left -= num_copy;
} else {
/* did anything change from last pass, if not return */
if (first) {
last_bytes_left = src->pub.bytes_in_buffer;
first = FALSE;
} else if (src->pub.bytes_in_buffer == last_bytes_left)
spinguard++;
else
last_bytes_left = src->pub.bytes_in_buffer;
}
/* should not go through twice and not pull bytes out of buf */
if (spinguard > 2)
return TRUE;
/* try to load jpeg header */
if (!context->got_header) {
int rc;
rc = jpeg_read_header (cinfo, TRUE);
context->src_initialized = TRUE;
if (rc == JPEG_SUSPENDED)
continue;
context->got_header = TRUE;
} else if (!context->did_prescan) {
int rc;
/* start decompression */
cinfo->buffered_image = TRUE;
rc = jpeg_start_decompress (cinfo);
cinfo->do_fancy_upsampling = FALSE;
cinfo->do_block_smoothing = FALSE;
context->pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
cinfo->output_components == 4 ? TRUE : FALSE,
8,
cinfo->image_width,
cinfo->image_height);
if (context->pixbuf == NULL) {
return FALSE;
}
/* Use pixbuf buffer to store decompressed data */
context->dptr = context->pixbuf->pixels;
/* Notify the client that we are ready to go */
(* context->prepared_func) (context->pixbuf,
context->user_data);
if (rc == JPEG_SUSPENDED)
continue;
context->did_prescan = TRUE;
} else {
/* we're decompressing so feed jpeg lib scanlines */
guchar *lines[4];
guchar **lptr;
guchar *rowptr;
gint nlines, i;
/* keep going until we've done all passes */
while (!jpeg_input_complete (cinfo)) {
if (!context->in_output) {
if (jpeg_start_output (cinfo, cinfo->input_scan_number)) {
context->in_output = TRUE;
context->dptr = context->pixbuf->pixels;
}
else
break;
}
/* keep going until we've done all scanlines */
while (cinfo->output_scanline < cinfo->output_height) {
lptr = lines;
rowptr = context->dptr;
for (i=0; i < cinfo->rec_outbuf_height; i++) {
*lptr++ = rowptr;
rowptr += context->pixbuf->rowstride;
}
nlines = jpeg_read_scanlines (cinfo, lines,
cinfo->rec_outbuf_height);
if (nlines == 0)
break;
switch (cinfo->out_color_space) {
case JCS_GRAYSCALE:
explode_gray_into_buf (cinfo, lines);
break;
case JCS_RGB:
/* do nothing */
break;
case JCS_CMYK:
convert_cmyk_to_rgb (cinfo, lines);
break;
default:
return FALSE;
}
context->dptr += nlines * context->pixbuf->rowstride;
/* send updated signal */
(* context->updated_func) (context->pixbuf,
0,
cinfo->output_scanline-1,
cinfo->image_width,
nlines,
context->user_data);
}
if (cinfo->output_scanline >= cinfo->output_height &&
jpeg_finish_output (cinfo))
context->in_output = FALSE;
else
break;
}
if (jpeg_input_complete (cinfo))
/* did entire image */
return TRUE;
else
continue;
}
}
return TRUE;
}
/* Shared library entry point */
static GdkPixbuf *
gdk_pixbuf__jpeg_image_load (FILE *f, GError **error)
{
gint i;
int is_otag;
char otag_str[5];
GdkPixbuf * volatile pixbuf = NULL;
guchar *dptr;
guchar *lines[4]; /* Used to expand rows, via rec_outbuf_height,
* from the header file:
* " Usually rec_outbuf_height will be 1 or 2,
* at most 4."
*/
guchar **lptr;
struct jpeg_decompress_struct cinfo;
struct error_handler_data jerr;
stdio_src_ptr src;
/* setup error handler */
cinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = fatal_error_handler;
jerr.pub.output_message = output_message_handler;
jerr.error = error;
if (sigsetjmp (jerr.setjmp_buffer, 1)) {
/* Whoops there was a jpeg error */
if (pixbuf)
g_object_unref (pixbuf);
jpeg_destroy_decompress (&cinfo);
/* error should have been set by fatal_error_handler () */
return NULL;
}
/* load header, setup */
jpeg_create_decompress (&cinfo);
cinfo.src = (struct jpeg_source_mgr *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof (stdio_source_mgr));
src = (stdio_src_ptr) cinfo.src;
src->buffer = (JOCTET *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
JPEG_PROG_BUF_SIZE * sizeof (JOCTET));
src->pub.init_source = stdio_init_source;
src->pub.fill_input_buffer = stdio_fill_input_buffer;
src->pub.skip_input_data = stdio_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = stdio_term_source;
src->infile = f;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
jpeg_save_markers (&cinfo, EXIF_JPEG_MARKER, 0xffff);
jpeg_read_header (&cinfo, TRUE);
/* check for orientation tag */
is_otag = get_orientation (&cinfo);
jpeg_start_decompress (&cinfo);
cinfo.do_fancy_upsampling = FALSE;
cinfo.do_block_smoothing = FALSE;
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
cinfo.out_color_components == 4 ? TRUE : FALSE,
8, cinfo.output_width, cinfo.output_height);
if (!pixbuf) {
jpeg_destroy_decompress (&cinfo);
/* broken check for *error == NULL for robustness against
* crappy JPEG library
*/
if (error && *error == NULL) {
g_set_error_literal (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to load image, try exiting some applications to free memory"));
}
return NULL;
}
/* if orientation tag was found set an option to remember its value */
if (is_otag) {
g_snprintf (otag_str, sizeof (otag_str), "%d", is_otag);
gdk_pixbuf_set_option (pixbuf, "orientation", otag_str);
}
dptr = pixbuf->pixels;
/* decompress all the lines, a few at a time */
while (cinfo.output_scanline < cinfo.output_height) {
lptr = lines;
for (i = 0; i < cinfo.rec_outbuf_height; i++) {
*lptr++ = dptr;
dptr += pixbuf->rowstride;
}
jpeg_read_scanlines (&cinfo, lines, cinfo.rec_outbuf_height);
switch (cinfo.out_color_space) {
case JCS_GRAYSCALE:
explode_gray_into_buf (&cinfo, lines);
break;
case JCS_RGB:
/* do nothing */
break;
case JCS_CMYK:
convert_cmyk_to_rgb (&cinfo, lines);
break;
default:
g_object_unref (pixbuf);
if (error && *error == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Unsupported JPEG color space (%s)"),
colorspace_name (cinfo.out_color_space));
}
jpeg_destroy_decompress (&cinfo);
return NULL;
}
}
jpeg_finish_decompress (&cinfo);
jpeg_destroy_decompress (&cinfo);
return pixbuf;
}
/* Shared library entry point */
GdkPixbuf *
gdk_pixbuf__jpeg_image_load (FILE *f)
{
gint i;
GdkPixbuf * volatile pixbuf = NULL;
guchar *dptr;
guchar *lines[4]; /* Used to expand rows, via rec_outbuf_height,
* from the header file:
* " Usually rec_outbuf_height will be 1 or 2,
* at most 4."
*/
guchar **lptr;
struct jpeg_decompress_struct cinfo;
struct error_handler_data jerr;
stdio_src_ptr src;
/* setup error handler */
cinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = fatal_error_handler;
if (sigsetjmp (jerr.setjmp_buffer, 1)) {
/* Whoops there was a jpeg error */
if (pixbuf)
gdk_pixbuf_unref (pixbuf);
jpeg_destroy_decompress (&cinfo);
return NULL;
}
/* load header, setup */
jpeg_create_decompress (&cinfo);
cinfo.src = (struct jpeg_source_mgr *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof (stdio_source_mgr));
src = (stdio_src_ptr) cinfo.src;
src->buffer = (JOCTET *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
JPEG_PROG_BUF_SIZE * sizeof (JOCTET));
src->pub.init_source = stdio_init_source;
src->pub.fill_input_buffer = stdio_fill_input_buffer;
src->pub.skip_input_data = stdio_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = stdio_term_source;
src->infile = f;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
jpeg_read_header (&cinfo, TRUE);
jpeg_start_decompress (&cinfo);
cinfo.do_fancy_upsampling = FALSE;
cinfo.do_block_smoothing = FALSE;
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
cinfo.out_color_components == 4 ? TRUE : FALSE,
8, cinfo.output_width, cinfo.output_height);
if (!pixbuf) {
jpeg_destroy_decompress (&cinfo);
return NULL;
}
dptr = pixbuf->pixels;
/* decompress all the lines, a few at a time */
while (cinfo.output_scanline < cinfo.output_height) {
lptr = lines;
for (i = 0; i < cinfo.rec_outbuf_height; i++) {
*lptr++ = dptr;
dptr += pixbuf->rowstride;
}
jpeg_read_scanlines (&cinfo, lines, cinfo.rec_outbuf_height);
switch (cinfo.out_color_space) {
case JCS_GRAYSCALE:
explode_gray_into_buf (&cinfo, lines);
break;
case JCS_RGB:
/* do nothing */
break;
case JCS_CMYK:
convert_cmyk_to_rgb (&cinfo, lines);
break;
default:
gdk_pixbuf_unref (pixbuf);
jpeg_destroy_decompress (&cinfo);
return NULL;
}
}
jpeg_finish_decompress (&cinfo);
jpeg_destroy_decompress (&cinfo);
return pixbuf;
}
