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gtk2/gdk-pixbuf/io-jpeg.c
Manish Singh 4bd1fa5ff3 removed unnecessary G_OBJECT() cast checks. 
Sun Feb  8 01:07:20 2004  Manish Singh  <yosh@gimp.org>

        * gdk-pixbuf-io.c: removed unnecessary G_OBJECT() cast checks.

        * io-jpeg.c: make the return type for to_callback_empty_output_buffer
        "boolean", which should be defined by the jpeg headers. The right
        return type for this function depends on how the jpeg library
        was built (one wonders what happens if different compilers are used).
2004-02-08 09:13:18 +00:00

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/* -*- mode: C; c-file-style: "linux" -*- */
/* GdkPixbuf library - JPEG image loader
*
* Copyright (C) 1999 Michael Zucchi
* Copyright (C) 1999 The Free Software Foundation
*
* Progressive loading code Copyright (C) 1999 Red Hat, Inc.
*
* Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
* Federico Mena-Quintero <federico@gimp.org>
* Michael Fulbright <drmike@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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-private.h"
#include "gdk-pixbuf-io.h"
#ifndef HAVE_SIGSETJMP
#define sigjmp_buf jmp_buf
#define sigsetjmp(jb, x) setjmp(jb)
#define siglongjmp longjmp
#endif
/* we are a "source manager" as far as libjpeg is concerned */
#define JPEG_PROG_BUF_SIZE 65536
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET buffer[JPEG_PROG_BUF_SIZE]; /* start of buffer */
long skip_next; /* number of bytes to skip next read */
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
/* error handler data */
struct error_handler_data {
struct jpeg_error_mgr pub;
sigjmp_buf setjmp_buffer;
GError **error;
};
/* progressive loader context */
typedef struct {
GdkPixbufModuleSizeFunc size_func;
GdkPixbufModuleUpdatedFunc updated_func;
GdkPixbufModulePreparedFunc prepared_func;
gpointer user_data;
GdkPixbuf *pixbuf;
guchar *dptr; /* current position in pixbuf */
gboolean did_prescan; /* are we in image data yet? */
gboolean got_header; /* have we loaded jpeg header? */
gboolean src_initialized;/* TRUE when jpeg lib initialized */
gboolean in_output; /* did we get suspended in an output pass? */
struct jpeg_decompress_struct cinfo;
struct error_handler_data jerr;
} JpegProgContext;
static GdkPixbuf *gdk_pixbuf__jpeg_image_load (FILE *f, GError **error);
static gpointer gdk_pixbuf__jpeg_image_begin_load (GdkPixbufModuleSizeFunc func0,
GdkPixbufModulePreparedFunc func1,
GdkPixbufModuleUpdatedFunc func2,
gpointer user_data,
GError **error);
static gboolean gdk_pixbuf__jpeg_image_stop_load (gpointer context, GError **error);
static gboolean gdk_pixbuf__jpeg_image_load_increment(gpointer context,
const guchar *buf, guint size,
GError **error);
static void
fatal_error_handler (j_common_ptr cinfo)
{
struct error_handler_data *errmgr;
char buffer[JMSG_LENGTH_MAX];
errmgr = (struct error_handler_data *) cinfo->err;
/* Create the message */
(* cinfo->err->format_message) (cinfo, buffer);
/* broken check for *error == NULL for robustness against
* crappy JPEG library
*/
if (errmgr->error && *errmgr->error == NULL) {
g_set_error (errmgr->error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Error interpreting JPEG image file (%s)"),
buffer);
}
siglongjmp (errmgr->setjmp_buffer, 1);
g_assert_not_reached ();
}
static void
output_message_handler (j_common_ptr cinfo)
{
/* This method keeps libjpeg from dumping crap to stderr */
/* do nothing */
}
/* explode gray image data from jpeg library into rgb components in pixbuf */
static void
explode_gray_into_buf (struct jpeg_decompress_struct *cinfo,
guchar **lines)
{
gint i, j;
guint w;
g_return_if_fail (cinfo != NULL);
g_return_if_fail (cinfo->output_components == 1);
g_return_if_fail (cinfo->out_color_space == JCS_GRAYSCALE);
/* Expand grey->colour. Expand from the end of the
* memory down, so we can use the same buffer.
*/
w = cinfo->output_width;
for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
guchar *from, *to;
from = lines[i] + w - 1;
to = lines[i] + (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--;
}
}
}
static void
convert_cmyk_to_rgb (struct jpeg_decompress_struct *cinfo,
guchar **lines)
{
gint i, j;
g_return_if_fail (cinfo != NULL);
g_return_if_fail (cinfo->output_components == 4);
g_return_if_fail (cinfo->out_color_space == JCS_CMYK);
for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
guchar *p;
p = lines[i];
for (j = 0; j < cinfo->output_width; j++) {
int c, m, y, k;
c = p[0];
m = p[1];
y = p[2];
k = p[3];
if (cinfo->saw_Adobe_marker) {
p[0] = k*c / 255;
p[1] = k*m / 255;
p[2] = k*y / 255;
}
else {
p[0] = (255 - k)*(255 - c) / 255;
p[1] = (255 - k)*(255 - m) / 255;
p[2] = (255 - k)*(255 - y) / 255;
}
p[3] = 255;
p += 4;
}
}
}
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
FILE * infile; /* source stream */
JOCTET * buffer; /* start of buffer */
boolean start_of_file; /* have we gotten any data yet? */
} stdio_source_mgr;
typedef stdio_source_mgr * stdio_src_ptr;
static void
stdio_init_source (j_decompress_ptr cinfo)
{
stdio_src_ptr src = (stdio_src_ptr)cinfo->src;
src->start_of_file = FALSE;
}
static boolean
stdio_fill_input_buffer (j_decompress_ptr cinfo)
{
stdio_src_ptr src = (stdio_src_ptr) cinfo->src;
size_t nbytes;
nbytes = fread (src->buffer, 1, JPEG_PROG_BUF_SIZE, src->infile);
if (nbytes <= 0) {
#if 0
if (src->start_of_file) /* Treat empty input file as fatal error */
ERREXIT(cinfo, JERR_INPUT_EMPTY);
WARNMS(cinfo, JWRN_JPEG_EOF);
#endif
/* Insert a fake EOI marker */
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI;
nbytes = 2;
}
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = nbytes;
src->start_of_file = FALSE;
return TRUE;
}
static void
stdio_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
stdio_src_ptr src = (stdio_src_ptr) cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long) src->pub.bytes_in_buffer) {
num_bytes -= (long) src->pub.bytes_in_buffer;
(void)stdio_fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
static void
stdio_term_source (j_decompress_ptr cinfo)
{
}
static gchar *
colorspace_name (const J_COLOR_SPACE jpeg_color_space)
{
switch (jpeg_color_space) {
case JCS_UNKNOWN: return "UNKNOWN";
case JCS_GRAYSCALE: return "GRAYSCALE";
case JCS_RGB: return "RGB";
case JCS_YCbCr: return "YCbCr";
case JCS_CMYK: return "CMYK";
case JCS_YCCK: return "YCCK";
default: return "invalid";
}
}
/* Shared library entry point */
static GdkPixbuf *
gdk_pixbuf__jpeg_image_load (FILE *f, GError **error)
{
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;
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);
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);
/* broken check for *error == NULL for robustness against
* crappy JPEG library
*/
if (error && *error == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to load image, try exiting some applications to free memory"));
}
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:
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;
}
/**** 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)
*/
static gpointer
gdk_pixbuf__jpeg_image_begin_load (GdkPixbufModuleSizeFunc size_func,
GdkPixbufModulePreparedFunc prepared_func,
GdkPixbufModuleUpdatedFunc updated_func,
gpointer user_data,
GError **error)
{
JpegProgContext *context;
my_source_mgr *src;
context = g_new0 (JpegProgContext, 1);
context->size_func = size_func;
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;
context->in_output = FALSE;
/* create libjpeg structures */
jpeg_create_decompress (&context->cinfo);
context->cinfo.src = (struct jpeg_source_mgr *) g_try_malloc (sizeof (my_source_mgr));
if (!context->cinfo.src) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Couldn't allocate memory for loading JPEG file"));
return NULL;
}
memset (context->cinfo.src, 0, sizeof (my_source_mgr));
src = (my_src_ptr) context->cinfo.src;
context->cinfo.err = jpeg_std_error (&context->jerr.pub);
context->jerr.pub.error_exit = fatal_error_handler;
context->jerr.pub.output_message = output_message_handler;
context->jerr.error = error;
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;
context->jerr.error = NULL;
return (gpointer) context;
}
/*
* context - returned from image_begin_load
*
* free context, unref gdk_pixbuf
*/
static gboolean
gdk_pixbuf__jpeg_image_stop_load (gpointer data, GError **error)
{
JpegProgContext *context = (JpegProgContext *) data;
g_return_val_if_fail (context != NULL, TRUE);
/* FIXME this thing needs to report errors if
* we have unused image data
*/
if (context->pixbuf)
g_object_unref (context->pixbuf);
/* if we have an error? */
if (sigsetjmp (context->jerr.setjmp_buffer, 1)) {
jpeg_destroy_decompress (&context->cinfo);
} else {
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);
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
*/
static gboolean
gdk_pixbuf__jpeg_image_load_increment (gpointer data,
const guchar *buf, guint size,
GError **error)
{
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;
gint width, height;
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;
context->jerr.error = error;
/* 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;
width = cinfo->image_width;
height = cinfo->image_height;
if (context->size_func) {
(* context->size_func) (&width, &height, context->user_data);
if (width == 0 || height == 0)
return FALSE;
}
for (cinfo->scale_denom = 2; cinfo->scale_denom <= 8; cinfo->scale_denom *= 2) {
jpeg_calc_output_dimensions (cinfo);
if (cinfo->output_width < width || cinfo->output_height < height) {
cinfo->scale_denom /= 2;
break;
}
}
jpeg_calc_output_dimensions (cinfo);
context->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
cinfo->output_components == 4 ? TRUE : FALSE,
8,
cinfo->output_width,
cinfo->output_height);
if (context->pixbuf == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Couldn't allocate memory for loading JPEG file"));
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,
NULL,
context->user_data);
} 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;
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:
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 */
(* 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;
}
/* Save */
#define TO_FUNCTION_BUF_SIZE 4096
typedef struct {
struct jpeg_destination_mgr pub;
JOCTET *buffer;
GdkPixbufSaveFunc save_func;
gpointer user_data;
GError **error;
} ToFunctionDestinationManager;
void
to_callback_init (j_compress_ptr cinfo)
{
ToFunctionDestinationManager *destmgr;
destmgr = (ToFunctionDestinationManager*) cinfo->dest;
destmgr->pub.next_output_byte = destmgr->buffer;
destmgr->pub.free_in_buffer = TO_FUNCTION_BUF_SIZE;
}
static void
to_callback_do_write (j_compress_ptr cinfo, gsize length)
{
ToFunctionDestinationManager *destmgr;
destmgr = (ToFunctionDestinationManager*) cinfo->dest;
if (!destmgr->save_func (destmgr->buffer,
length,
destmgr->error,
destmgr->user_data)) {
struct error_handler_data *errmgr;
errmgr = (struct error_handler_data *) cinfo->err;
/* Use a default error message if the callback didn't set one,
* which it should have.
*/
if (errmgr->error && *errmgr->error == NULL) {
g_set_error (errmgr->error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
"write function failed");
}
siglongjmp (errmgr->setjmp_buffer, 1);
g_assert_not_reached ();
}
}
static boolean
to_callback_empty_output_buffer (j_compress_ptr cinfo)
{
ToFunctionDestinationManager *destmgr;
destmgr = (ToFunctionDestinationManager*) cinfo->dest;
to_callback_do_write (cinfo, TO_FUNCTION_BUF_SIZE);
destmgr->pub.next_output_byte = destmgr->buffer;
destmgr->pub.free_in_buffer = TO_FUNCTION_BUF_SIZE;
return TRUE;
}
void
to_callback_terminate (j_compress_ptr cinfo)
{
ToFunctionDestinationManager *destmgr;
destmgr = (ToFunctionDestinationManager*) cinfo->dest;
to_callback_do_write (cinfo, TO_FUNCTION_BUF_SIZE - destmgr->pub.free_in_buffer);
}
static gboolean
real_save_jpeg (GdkPixbuf *pixbuf,
gchar **keys,
gchar **values,
GError **error,
gboolean to_callback,
FILE *f,
GdkPixbufSaveFunc save_func,
gpointer user_data)
{
/* FIXME error handling is broken */
struct jpeg_compress_struct cinfo;
guchar *buf = NULL;
guchar *ptr;
guchar *pixels = NULL;
JSAMPROW *jbuf;
int y = 0;
volatile int quality = 75; /* default; must be between 0 and 100 */
int i, j;
int w, h = 0;
int rowstride = 0;
struct error_handler_data jerr;
ToFunctionDestinationManager to_callback_destmgr;
to_callback_destmgr.buffer = NULL;
if (keys && *keys) {
gchar **kiter = keys;
gchar **viter = values;
while (*kiter) {
if (strcmp (*kiter, "quality") == 0) {
char *endptr = NULL;
quality = strtol (*viter, &endptr, 10);
if (endptr == *viter) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_BAD_OPTION,
_("JPEG quality must be a value between 0 and 100; value '%s' could not be parsed."),
*viter);
return FALSE;
}
if (quality < 0 ||
quality > 100) {
/* This is a user-visible error;
* lets people skip the range-checking
* in their app.
*/
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_BAD_OPTION,
_("JPEG quality must be a value between 0 and 100; value '%d' is not allowed."),
quality);
return FALSE;
}
} else {
g_warning ("Bad option name '%s' passed to JPEG saver",
*kiter);
return FALSE;
}
++kiter;
++viter;
}
}
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
w = gdk_pixbuf_get_width (pixbuf);
h = gdk_pixbuf_get_height (pixbuf);
/* no image data? abort */
pixels = gdk_pixbuf_get_pixels (pixbuf);
g_return_val_if_fail (pixels != NULL, FALSE);
/* Allocate a small buffer to convert image data,
* and a larger buffer if doing to_callback save.
*/
buf = g_try_malloc (w * 3 * sizeof (guchar));
if (!buf) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Couldn't allocate memory for loading JPEG file"));
return FALSE;
}
if (to_callback) {
to_callback_destmgr.buffer = g_try_malloc (TO_FUNCTION_BUF_SIZE);
if (!to_callback_destmgr.buffer) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Couldn't allocate memory for loading JPEG file"));
return FALSE;
}
}
/* set up error handling */
jerr.pub.error_exit = fatal_error_handler;
jerr.pub.output_message = output_message_handler;
jerr.error = error;
cinfo.err = jpeg_std_error (&(jerr.pub));
if (sigsetjmp (jerr.setjmp_buffer, 1)) {
jpeg_destroy_compress (&cinfo);
g_free (buf);
g_free (to_callback_destmgr.buffer);
return FALSE;
}
/* setup compress params */
jpeg_create_compress (&cinfo);
if (to_callback) {
to_callback_destmgr.pub.init_destination = to_callback_init;
to_callback_destmgr.pub.empty_output_buffer = to_callback_empty_output_buffer;
to_callback_destmgr.pub.term_destination = to_callback_terminate;
to_callback_destmgr.error = error;
to_callback_destmgr.save_func = save_func;
to_callback_destmgr.user_data = user_data;
cinfo.dest = (struct jpeg_destination_mgr*) &to_callback_destmgr;
} else {
jpeg_stdio_dest (&cinfo, f);
}
cinfo.image_width = w;
cinfo.image_height = h;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
/* set up jepg compression parameters */
jpeg_set_defaults (&cinfo);
jpeg_set_quality (&cinfo, quality, TRUE);
jpeg_start_compress (&cinfo, TRUE);
/* get the start pointer */
ptr = pixels;
/* go one scanline at a time... and save */
i = 0;
while (cinfo.next_scanline < cinfo.image_height) {
/* convert scanline from ARGB to RGB packed */
for (j = 0; j < w; j++)
memcpy (&(buf[j*3]), &(ptr[i*rowstride + j*3]), 3);
/* write scanline */
jbuf = (JSAMPROW *)(&buf);
jpeg_write_scanlines (&cinfo, jbuf, 1);
i++;
y++;
}
/* finish off */
jpeg_finish_compress (&cinfo);
jpeg_destroy_compress(&cinfo);
g_free (buf);
g_free (to_callback_destmgr.buffer);
return TRUE;
}
static gboolean
gdk_pixbuf__jpeg_image_save (FILE *f,
GdkPixbuf *pixbuf,
gchar **keys,
gchar **values,
GError **error)
{
return real_save_jpeg (pixbuf, keys, values, error,
FALSE, f, NULL, NULL);
}
static gboolean
gdk_pixbuf__jpeg_image_save_to_callback (GdkPixbufSaveFunc save_func,
gpointer user_data,
GdkPixbuf *pixbuf,
gchar **keys,
gchar **values,
GError **error)
{
return real_save_jpeg (pixbuf, keys, values, error,
TRUE, NULL, save_func, user_data);
}
void
MODULE_ENTRY (jpeg, fill_vtable) (GdkPixbufModule *module)
{
module->load = gdk_pixbuf__jpeg_image_load;
module->begin_load = gdk_pixbuf__jpeg_image_begin_load;
module->stop_load = gdk_pixbuf__jpeg_image_stop_load;
module->load_increment = gdk_pixbuf__jpeg_image_load_increment;
module->save = gdk_pixbuf__jpeg_image_save;
module->save_to_callback = gdk_pixbuf__jpeg_image_save_to_callback;
}
void
MODULE_ENTRY (jpeg, fill_info) (GdkPixbufFormat *info)
{
static GdkPixbufModulePattern signature[] = {
{ "\xff\xd8", NULL, 100 },
{ NULL, NULL, 0 }
};
static gchar * mime_types[] = {
"image/jpeg",
NULL
};
static gchar * extensions[] = {
"jpeg",
"jpe",
"jpg",
NULL
};
info->name = "jpeg";
info->signature = signature;
info->description = N_("The JPEG image format");
info->mime_types = mime_types;
info->extensions = extensions;
info->flags = GDK_PIXBUF_FORMAT_WRITABLE;
}
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