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Prettied up code slightly. Start of pnm loader (from file and

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999-11-04  Michael Fulbright  <drmike@redhat.com>

	* src/io-jpeg.c: Prettied up code slightly.
	* src/io-pnm.c:  Start of pnm loader (from file and progressively).
	                 Doesn't do much yet (will finish tomorrow).
	* src/gdk-pixbuf-io.c: Added pnm to structure of known types.
This commit is contained in:
Michael Fulbright 1999-11-05 00:16:10 +00:00 committed by Michael Fulbright
parent f527b8909f
commit 01fcce4cf9
4 changed files with 925 additions and 20 deletions
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7
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,10 @@
1999-11-04 Michael Fulbright <drmike@redhat.com>
* src/io-jpeg.c: Prettied up code slightly.
* src/io-pnm.c: Start of pnm loader (from file and progressively).
Doesn't do much yet (will finish tomorrow).
* src/gdk-pixbuf-io.c: Added pnm to structure of known types.
1999-11-04 Federico Mena Quintero <federico@redhat.com>
* doc/tmpl/rendering.sgml: Populated.

31
gdk-pixbuf/gdk-pixbuf-io.c
View File

@ -103,21 +103,8 @@ pixbuf_check_xpm (guchar *buffer, int size)
return FALSE;
}
#if 0
static gboolean
pixbuf_check_bmp (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (buffer [0] != 'B' || buffer [1] != 'M')
return FALSE;
return TRUE;
}
static gboolean
pixbuf_check_ppm (guchar *buffer, int size)
pixbuf_check_pnm (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
@ -133,6 +120,20 @@ pixbuf_check_ppm (guchar *buffer, int size)
}
return FALSE;
}
#if 0
static gboolean
pixbuf_check_bmp (guchar *buffer, int size)
{
if (size < 20)
return FALSE;
if (buffer [0] != 'B' || buffer [1] != 'M')
return FALSE;
return TRUE;
}
#endif
GdkPixbufModule file_formats [] = {
@ -142,9 +143,9 @@ GdkPixbufModule file_formats [] = {
{ "gif", pixbuf_check_gif, NULL, NULL, NULL, NULL, NULL, NULL },
#define XPM_FILE_FORMAT_INDEX 4
{ "xpm", pixbuf_check_xpm, NULL, NULL, NULL, NULL, NULL, NULL },
{ "pnm", pixbuf_check_pnm, NULL, NULL, NULL, NULL, NULL, NULL },
#if 0
{ "bmp", pixbuf_check_bmp, NULL, NULL, NULL, NULL, NULL, NULL },
{ "ppm", pixbuf_check_ppm, NULL, NULL, NULL, NULL, NULL, NULL },
#endif
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL }
};

7
gdk-pixbuf/io-jpeg.c
View File

@ -150,7 +150,7 @@ explode_gray_into_buf (struct jpeg_decompress_struct *cinfo,
GdkPixbuf *
image_load (FILE *f)
{
int w, h, i;
gint w, h, i;
guchar *pixels = NULL;
guchar *dptr;
guchar *lines[4]; /* Used to expand rows, via rec_outbuf_height,
@ -161,7 +161,6 @@ image_load (FILE *f)
guchar **lptr;
struct jpeg_decompress_struct cinfo;
struct error_handler_data jerr;
GdkPixbuf *pixbuf;
/* setup error handler */
cinfo.err = jpeg_std_error (&jerr.pub);
@ -187,7 +186,7 @@ image_load (FILE *f)
w = cinfo.output_width;
h = cinfo.output_height;
pixels = malloc (h * w * 3);
pixels = g_malloc (h * w * 3);
if (!pixels) {
jpeg_destroy_decompress (&cinfo);
return NULL;
@ -216,8 +215,6 @@ image_load (FILE *f)
return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, FALSE,
w, h, w * 3,
free_buffer, NULL);
return pixbuf;
}

900
gdk-pixbuf/io-pnm.c Normal file
View File

@ -0,0 +1,900 @@
/* GdkPixbuf library - PNM image loader
*
* Copyright (C) 1999 Red Hat, Inc.
*
* Authors: Michael Fulbright <drmike@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <jpeglib.h>
#include "gdk-pixbuf.h"
#include "gdk-pixbuf-io.h"
#define PNM_BUF_SIZE 4096
#define PNM_SUSPEND 0
#define PNM_OK 1
#define PNM_FATAL_ERR -1
typedef enum {
PNM_FORMAT_PGM,
PNM_FORMAT_PGM_RAW,
PNM_FORMAT_PPM,
PNM_FORMAT_PPM_RAW,
PNM_FORMAT_PBM,
PNM_FORMAT_PBM_RAW
} PnmFormat;
typedef struct {
guchar buffer[PNM_BUF_SIZE];
guchar *next_byte;
guint bytes_left;
} PnmIOBuffer;
typedef struct {
ModuleUpdatedNotifyFunc updated_func;
ModulePreparedNotifyFunc prepared_func;
gpointer user_data;
GdkPixbuf *pixbuf;
guchar *pixels; /* incoming pixel data buffer */
guchar *dptr; /* current position in pixbuf */
PnmIOBuffer inbuf;
guint width;
guint height;
PnmFormat type;
guint output_row; /* last row to be completed */
guint output_col;
gboolean did_prescan; /* are we in image data yet? */
gboolean got_header; /* have we loaded jpeg header? */
} PnmLoaderContext;
GdkPixbuf *image_load (FILE *f);
gpointer image_begin_load (ModulePreparedNotifyFunc func,
ModuleUpdatedNotifyFunc func2, gpointer user_data);
void image_stop_load (gpointer context);
gboolean image_load_increment(gpointer context, guchar *buf, guint size);
/* Destroy notification function for the libart pixbuf */
static void
free_buffer (gpointer user_data, gpointer data)
{
free (data);
}
/* explode bitmap data into rgb components */
static void
explode_bitmap_into_buf (guchar *dptr, guint w)
{
guchar *p;
guchar data;
gint i;
for (p = dptr; (p-dptr) < w; p++) {
data = *p;
for (i=0; i<8; i++, data >> 1)
*(p+i) = (data & 1) ? 0xff : 0x00;
}
}
/* explode gray image row into rgb components in pixbuf */
static void
explode_gray_into_buf (guchar *dptr, guint w)
{
gint i, j;
guchar *from, *to;
g_return_if_fail (dptr != NULL);
/* Expand grey->colour. Expand from the end of the
* memory down, so we can use the same buffer.
*/
from = dptr + w - 1;
to = dptr + (w - 1) * 3;
for (j = w - 1; j >= 0; j--) {
to[0] = from[0];
to[1] = from[0];
to[2] = from[0];
to -= 3;
from--;
}
}
/* skip over whitespace in file from current pos. */
/* also skips comments */
/* returns pointer to first non-whitespace char hit or, or NULL if */
/* we ran out of data w/o hitting a whitespace */
/* internal pointer in inbuf isnt moved ahead in this case */
static guchar *
skip_ahead_whitespace (PnmIOBuffer *inbuf)
{
gboolean in_comment;
guchar *ptr;
guint num_left;
g_return_if_fail (inbuf != NULL);
g_return_if_fail (inbuf->next_byte != NULL);
in_comment = FALSE;
num_left = inbuf->bytes_left;
ptr = inbuf->next_byte;
while (num_left > 0) {
if (in_comment) {
if (*ptr == '\n')
in_comment = FALSE;
} else if (*ptr == '#') {
in_comment = TRUE;
} else if (!isspace (*ptr)) {
inbuf->bytes_left -= (ptr-inbuf->next_byte);
inbuf->next_byte = ptr;
return ptr;
}
ptr ++;
num_left--;
}
return NULL;
}
/* reads into buffer until we hit whitespace in file from current pos, */
/* return NULL if ran out of data */
/* advances inbuf if successful */
static guchar *
read_til_whitespace (PnmIOBuffer *inbuf, guchar *buf, guint size)
{
guchar *p;
guchar *ptr;
guint num_left;
g_return_if_fail (inbuf != NULL);
g_return_if_fail (inbuf->next_byte != NULL);
p = buf;
num_left = inbuf->bytes_left;
ptr = inbuf->next_byte;
while (num_left > 0 && (p-buf)+1 < size) {
if (isspace (*ptr)) {
*p = '\0';
inbuf->bytes_left = num_left;
inbuf->next_byte = ptr;
return ptr;
} else {
*p = *ptr;
p++;
ptr++;
num_left--;
}
}
return NULL;
}
/* read next number from buffer */
/* -1 if failed, 0 if successful */
static gint
read_next_number (PnmIOBuffer *inbuf, guint *value)
{
guchar *tmpptr;
guchar *old_next_byte;
gchar *errptr;
guint old_bytes_left;
guchar buf[128];
g_return_if_fail (inbuf != NULL);
g_return_if_fail (inbuf->next_byte != NULL);
g_return_if_fail (value != NULL);
old_next_byte = inbuf->next_byte;
old_bytes_left = inbuf->bytes_left;
if ((tmpptr = skip_ahead_whitespace (inbuf)) == NULL)
return -1;
if ((tmpptr = read_til_whitespace (inbuf, buf, 128)) == NULL) {
inbuf->next_byte = old_next_byte;
inbuf->bytes_left = old_bytes_left;
return -1;
}
*value = strtol (buf, &errptr, 10);
if (*errptr != '\0') {
inbuf->next_byte = old_next_byte;
inbuf->bytes_left = old_bytes_left;
return -1;
}
return 0;
}
/* returns PNM_OK, PNM_SUSPEND, or PNM_FATAL_ERR */
static gint
pnm_read_header (PnmLoaderContext *context)
{
guchar *old_next_byte;
guint old_bytes_left;
PnmIOBuffer *inbuf;
guint maxval;
guint w, h;
gint rc;
PnmFormat type;
g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
inbuf = &context->inbuf;
old_bytes_left = inbuf->bytes_left;
old_next_byte = inbuf->next_byte;
/* file must start with a 'P' followed by a numeral */
/* so loop till we get enough data to determine type*/
if (inbuf->bytes_left < 2)
return PNM_SUSPEND;
if (*inbuf->next_byte != 'P')
return PNM_FATAL_ERR;
switch (*(inbuf->next_byte+1)) {
case '1':
type = PNM_FORMAT_PBM;
break;
case '2':
type = PNM_FORMAT_PGM;
break;
case '3':
type = PNM_FORMAT_PPM;
break;
case '4':
type = PNM_FORMAT_PBM_RAW;
break;
case '5':
type = PNM_FORMAT_PGM_RAW;
break;
case '6':
type = PNM_FORMAT_PPM_RAW;
break;
default:
return PNM_FATAL_ERR;
}
g_print ("File format is %d\n", type);
context->type = type;
inbuf->next_byte += 2;
inbuf->bytes_left -= 2;
/* now read remainder of header */
if ((rc = read_next_number (inbuf, &w))) {
inbuf->next_byte = old_next_byte;
inbuf->bytes_left = old_bytes_left;
return PNM_SUSPEND;
}
if ((rc = read_next_number (inbuf, &h))) {
inbuf->next_byte = old_next_byte;
inbuf->bytes_left = old_bytes_left;
return PNM_SUSPEND;
}
g_print ("Dimensions are %d x %d\n", w, h);
context->width = w;
context->height = h;
switch (type) {
case PNM_FORMAT_PPM:
case PNM_FORMAT_PPM_RAW:
case PNM_FORMAT_PGM:
case PNM_FORMAT_PGM_RAW:
if ((rc = read_next_number (inbuf, &maxval)) < 0) {
inbuf->next_byte = old_next_byte;
inbuf->bytes_left = old_bytes_left;
return PNM_SUSPEND;
}
g_print ("Maximum component value is %d\n", maxval);
break;
default:
break;
}
return 0;
}
/* returns 1 if a scanline was converted, 0 means we ran out of data */
static gint
pnm_read_scanline (PnmLoaderContext *context)
{
guint numpix;
guint numbytes;
guchar *dptr;
PnmIOBuffer *inbuf;
g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
inbuf = &context->inbuf;
/* read in image data */
/* for raw formats this is trivial */
switch (context->type) {
case PNM_FORMAT_PBM_RAW:
case PNM_FORMAT_PGM_RAW:
case PNM_FORMAT_PPM_RAW:
switch (context->type) {
case PNM_FORMAT_PBM_RAW:
numpix = inbuf->bytes_left * 8;
break;
case PNM_FORMAT_PGM_RAW:
numpix = inbuf->bytes_left;
break;
case PNM_FORMAT_PPM_RAW:
numpix = inbuf->bytes_left;
break;
}
numpix = MIN (numpix, context->width - context->output_col);
if (numpix == 0)
return PNM_SUSPEND;
switch (context->type) {
case PNM_FORMAT_PBM_RAW:
numbytes = numpix/8;
break;
case PNM_FORMAT_PGM_RAW:
numbytes = numpix;
break;
case PNM_FORMAT_PPM_RAW:
numbytes = numpix*3;
break;
}
dptr = context->pixels +
context->output_row * context->width * 3 +
context->output_col;
memcpy (dptr, inbuf->next_byte, numpix);
if ( context->type == PNM_FORMAT_PBM_RAW )
explode_bitmap_info_buf (dptr, numpix);
else if ( context->type == PNM_FORMAT_PGM_RAW )
explode_gray_info_buf (dptr, numpix);
default:
g_print ("Cannot load these image types (yet)\n");
return PNM_FATAL_ERR;
}
}
/* Shared library entry point */
GdkPixbuf *
image_load (FILE *f)
{
guint w, h, i;
guchar *pixels = NULL;
guchar *dptr;
guchar buf[PNM_BUF_SIZE];
guint nbytes;
guint chunksize;
gint rc;
PnmLoaderContext context;
PnmIOBuffer *inbuf;
#if 0
G_BREAKPOINT();
#endif
/* pretend to be doing progressive loading */
context.updated_func = context.prepared_func = NULL;
context.user_data = NULL;
context.inbuf.bytes_left = 0;
context.inbuf.next_byte = NULL;
context.pixels = context.pixbuf = NULL;
context.got_header = context.did_prescan = FALSE;
inbuf = &context.inbuf;
while (TRUE) {
guint num_to_read;
/* keep buffer as full as possible */
num_to_read = PNM_BUF_SIZE - inbuf->bytes_left;
if (inbuf->next_byte != NULL)
memmove (inbuf->buffer, inbuf->next_byte,
inbuf->bytes_left);
nbytes = fread (inbuf->buffer, 1, num_to_read, f);
inbuf->bytes_left += nbytes;
inbuf->next_byte = inbuf->buffer;
/* ran out of data and we haven't exited main loop */
/* something is wrong */
if (inbuf->bytes_left == 0) {
if (context.pixels)
g_free (context.pixels);
g_warning ("io-pnm.c: Ran out of data...\n");
return NULL;
}
/* get header if needed */
if (!context.got_header) {
rc = pnm_read_header (&context);
if (rc == PNM_FATAL_ERR)
return NULL;
else if (rc == PNM_SUSPEND)
continue;
context.got_header = TRUE;
}
/* scan until we hit image data */
if (!context.did_prescan) {
g_print ("doing prescan\n");
if (skip_ahead_whitespace (inbuf) == NULL)
continue;
context.did_prescan = TRUE;
context.output_row = 0;
context.output_col = 0;
pixels = g_malloc (context.height *
context.width * 3);
if (!pixels)
return NULL;
g_print ("prescan complete\n");
}
/* if we got here we're reading image data */
while (context.output_row < context.height) {
g_print ("reading row %d ...",context.output_row+1);
rc = pnm_read_scanline (&context);
if (rc == PNM_SUSPEND) {
g_print ("suspended\n");
break;
} else if (rc == PNM_FATAL_ERR) {
if (context.pixels)
g_free (context.pixels);
g_warning ("io-pnm.c: error reading rows..\n");
return NULL;
}
g_print ("completed\n");
}
if (context.output_row < context.height)
continue;
else
break;
}
#if 0
dptr = buf;
switch (type) {
case PNM_FORMAT_PPM:
case PNM_FORMAT_PGM:
if ((val = skip_ahead_whitespace (f)) < 0)
return NULL;
buf[0] = val;
if (read_til_whitespace (f, buf+1, PNM_BUF_SIZE) < 0)
return NULL;
maxval = strtol (buf, &errptr, 10);
g_print ("Maximum component value is %d\n", maxval);
if (*errptr != '\0')
return NULL;
break;
default:
break;
}
fflush(stdout);
/* read in image data */
/* for raw formats this is trivial */
switch (type) {
case PNM_FORMAT_PBM_RAW:
chunksize = w/8;
case PNM_FORMAT_PGM_RAW:
chunksize = w;
case PNM_FORMAT_PPM_RAW:
chunksize = 3*w;
dptr = pixels;
while (!feof (f)) {
nbytes = fread (dptr, 1, chunksize, f);
if (nbytes < chunksize && nbytes != 0) {
g_free (pixels);
return NULL;
}
if ( type == PNM_FORMAT_PBM_RAW )
explode_bitmap_info_buf (dptr, w);
else if ( type == PNM_FORMAT_PGM_RAW )
explode_gray_info_buf (dptr);
dptr += 3*w;
}
/* did we get the entire image? */
if ((dptr - pixels) != 3*w*(h+1)) {
g_free (pixels);
return NULL;
}
break;
default:
g_print ("Couldnt load image data (yet)\n");
fflush(stdout);
return NULL;
}
return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, FALSE,
w, h, w * 3,
free_buffer, NULL);
#endif
}
#if 0
/**** Progressive image loading handling *****/
/* these routines required because we are acting as a source manager for */
/* libjpeg. */
static void
init_source (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->skip_next = 0;
}
static void
term_source (j_decompress_ptr cinfo)
{
/* XXXX - probably should scream something has happened */
}
/* for progressive loading (called "I/O Suspension" by libjpeg docs) */
/* we do nothing except return "FALSE" */
static boolean
fill_input_buffer (j_decompress_ptr cinfo)
{
return FALSE;
}
static void
skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
long num_can_do;
/* move as far as we can into current buffer */
/* then set skip_next to catch the rest */
if (num_bytes > 0) {
num_can_do = MIN (src->pub.bytes_in_buffer, num_bytes);
src->pub.next_input_byte += (size_t) num_can_do;
src->pub.bytes_in_buffer -= (size_t) num_can_do;
src->skip_next = num_bytes - num_can_do;
}
}
/*
* func - called when we have pixmap created (but no image data)
* user_data - passed as arg 1 to func
* return context (opaque to user)
*/
gpointer
image_begin_load (ModulePreparedNotifyFunc prepared_func,
ModuleUpdatedNotifyFunc updated_func,
gpointer user_data)
{
JpegProgContext *context;
my_source_mgr *src;
context = g_new0 (JpegProgContext, 1);
context->prepared_func = prepared_func;
context->updated_func = updated_func;
context->user_data = user_data;
context->pixbuf = NULL;
context->got_header = FALSE;
context->did_prescan = FALSE;
context->src_initialized = FALSE;
/* create libjpeg structures */
jpeg_create_decompress (&context->cinfo);
context->cinfo.src = (struct jpeg_source_mgr *) g_new0 (my_source_mgr, 1);
src = (my_src_ptr) context->cinfo.src;
context->cinfo.err = jpeg_std_error (&context->jerr.pub);
src = (my_src_ptr) context->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.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
return (gpointer) context;
}
/*
* context - returned from image_begin_load
*
* free context, unref gdk_pixbuf
*/
void
image_stop_load (gpointer data)
{
JpegProgContext *context = (JpegProgContext *) data;
g_return_if_fail (context != NULL);
if (context->pixbuf)
gdk_pixbuf_unref (context->pixbuf);
jpeg_finish_decompress(&context->cinfo);
jpeg_destroy_decompress(&context->cinfo);
if (context->cinfo.src) {
my_src_ptr src = (my_src_ptr) context->cinfo.src;
g_free (src);
}
g_free (context);
}
/*
* context - from image_begin_load
* buf - new image data
* size - length of new image data
*
* append image data onto inrecrementally built output image
*/
gboolean
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;
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;
/* XXXXXXX (drmike) - loop(s) below need to be recoded now I
* have a grasp of what the flow needs to be!
*/
/* 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;
}
last_bytes_left = 0;
spinguard = 0;
while (src->pub.bytes_in_buffer != 0 || num_left != 0) {
/* 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);
/* if (num_copy == 0)
g_error ("Buffer overflow!");
*/
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 (last_bytes_left == 0)
last_bytes_left = src->pub.bytes_in_buffer;
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;
if (jpeg_has_multiple_scans (cinfo)) {
g_print ("io-jpeg.c: Does not currently "
"support progressive jpeg files.\n");
return FALSE;
}
context->pixbuf = gdk_pixbuf_new(ART_PIX_RGB,
/*have_alpha*/ FALSE,
8,
cinfo->image_width,
cinfo->image_height);
if (context->pixbuf == NULL) {
/* Failed to allocate memory */
g_error ("Couldn't allocate gdkpixbuf");
}
/* Use pixbuf buffer to store decompressed data */
context->dptr = context->pixbuf->art_pixbuf->pixels;
/* Notify the client that we are ready to go */
(* context->prepared_func) (context->pixbuf,
context->user_data);
} else if (!context->did_prescan) {
int rc;
/* start decompression */
rc = jpeg_start_decompress (cinfo);
cinfo->do_fancy_upsampling = FALSE;
cinfo->do_block_smoothing = FALSE;
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, *p;
gint nlines, i;
gint start_scanline;
/* keep going until we've done all scanlines */
while (cinfo->output_scanline < cinfo->output_height) {
start_scanline = cinfo->output_scanline;
lptr = lines;
rowptr = context->dptr;
for (i=0; i < cinfo->rec_outbuf_height; i++) {
*lptr++ = rowptr;
rowptr += context->pixbuf->art_pixbuf->rowstride;;
}
#ifdef IO_JPEG_DEBUG_GREY
for (p=lines[0],i=0; i< context->pixbuf->art_pixbuf->rowstride;i++, p++)
*p = 0;
#endif
nlines = jpeg_read_scanlines (cinfo, lines,
cinfo->rec_outbuf_height);
if (nlines == 0)
break;
/* handle gray */
if (cinfo->output_components == 1)
explode_gray_into_buf (cinfo, lines);
context->dptr += nlines * context->pixbuf->art_pixbuf->rowstride;
/* send updated signal */
(* context->updated_func) (context->pixbuf,
context->user_data,
0,
cinfo->output_scanline-1,
cinfo->image_width,
nlines);
#undef DEBUG_JPEG_PROGRESSIVE
#ifdef DEBUG_JPEG_PROGRESSIVE
if (start_scanline != cinfo->output_scanline)
g_print("jpeg: Input pass=%2d, next input scanline=%3d,"
" emitted %3d - %3d\n",
cinfo->input_scan_number, cinfo->input_iMCU_row * 16,
start_scanline, cinfo->output_scanline - 1);
g_print ("Scanline %d of %d - ",
cinfo->output_scanline,
cinfo->output_height);
/* g_print ("rec_height %d -", cinfo->rec_outbuf_height); */
g_print ("Processed %d lines - bytes left = %d\n",
nlines, cinfo->src->bytes_in_buffer);
#endif
}
/* did entire image */
if (cinfo->output_scanline >= cinfo->output_height)
return TRUE;
else
continue;
}
}
return TRUE;
}
#endif