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Fixed code which moved buffer around as new data comes in to work

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1999-11-03  Michael Fulbright  <drmike@redhat.com>

	* src/io-jpg.c image_load_increment(): Fixed code which moved
	buffer around as new data comes in to work properly. JPEG progressive
	loading should be working now except for grayscale JPEG's, which I
This commit is contained in:
Michael Fulbright 1999-11-03 17:17:32 +00:00 committed by Michael Fulbright
parent afed181c0a
commit 3d5a2b1230
1 changed files with 22 additions and 21 deletions
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43
gdk-pixbuf/io-jpeg.c
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@ -45,6 +45,8 @@
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <jpeglib.h>
#include "gdk-pixbuf.h"
@ -53,11 +55,12 @@
/* we are a "source manager" as far as libjpeg is concerned */
#define JPEG_PROG_BUF_SIZE 4096
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET * buffer; /* start of buffer */
gboolean start_of_file; /* have we gotten any data yet? */
JOCTET buffer[JPEG_PROG_BUF_SIZE]; /* start of buffer */
long skip_next; /* number of bytes to skip next read */
} my_source_mgr;
@ -85,8 +88,6 @@ typedef struct {
struct error_handler_data jerr;
} JpegProgContext;
#define JPEG_PROG_BUF_SIZE 4096
GdkPixbuf *image_load (FILE *f);
gpointer image_begin_load (ModulePreparedNotifyFunc func, gpointer user_data);
void image_stop_load (gpointer context);
@ -227,7 +228,6 @@ init_source (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->start_of_file = TRUE;
src->skip_next = 0;
}
@ -278,7 +278,7 @@ image_begin_load (ModulePreparedNotifyFunc func, gpointer user_data)
JpegProgContext *context;
my_source_mgr *src;
context = g_new (JpegProgContext, 1);
context = g_new0 (JpegProgContext, 1);
context->notify_func = func;
context->notify_user_data = user_data;
context->pixbuf = NULL;
@ -289,9 +289,8 @@ image_begin_load (ModulePreparedNotifyFunc func, gpointer user_data)
/* create libjpeg structures */
jpeg_create_decompress (&context->cinfo);
context->cinfo.src = (struct jpeg_source_mgr *) g_new (my_source_mgr, 1);
context->cinfo.src = (struct jpeg_source_mgr *) g_new0 (my_source_mgr, 1);
src = (my_src_ptr) context->cinfo.src;
src->buffer = g_malloc (JPEG_PROG_BUF_SIZE);
context->cinfo.err = jpeg_std_error (&context->jerr.pub);
@ -316,6 +315,7 @@ void
image_stop_load (gpointer data)
{
JpegProgContext *context = (JpegProgContext *) data;
g_return_if_fail (context != NULL);
if (context->pixbuf)
@ -324,8 +324,6 @@ image_stop_load (gpointer data)
if (context->cinfo.src) {
my_src_ptr src = (my_src_ptr) context->cinfo.src;
if (src->buffer)
g_free (src->buffer);
g_free (src);
}
@ -352,12 +350,12 @@ image_load_increment (gpointer data, guchar *buf, guint size)
struct jpeg_decompress_struct *cinfo;
my_src_ptr src;
guint num_left, num_copy;
guchar *nextptr;
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;
/* skip over data if requested, handle unsigned int sizes cleanly */
@ -374,23 +372,24 @@ image_load_increment (gpointer data, guchar *buf, guint size)
num_left = size;
}
while (num_left > 0) {
/* copy as much data into buffer as possible */
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,
size);
if (num_copy == 0)
g_assert ("Buffer overflow!\n");
g_error ("Buffer overflow!");
nextptr = src->buffer + src->pub.bytes_in_buffer;
memcpy (nextptr, buf, num_copy);
if (src->pub.next_input_byte == NULL ||
src->pub.bytes_in_buffer == 0)
memcpy(src->buffer + src->pub.bytes_in_buffer, buf, num_copy);
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer += num_copy;
num_left -= num_copy;
/* try to load jpeg header */
@ -399,6 +398,7 @@ image_load_increment (gpointer data, guchar *buf, guint size)
rc = jpeg_read_header (cinfo, TRUE);
context->src_initialized = TRUE;
if (rc == JPEG_SUSPENDED)
continue;
@ -418,7 +418,7 @@ image_load_increment (gpointer data, guchar *buf, guint size)
if (context->pixbuf == NULL) {
/* Failed to allocate memory */
g_assert ("Couldn't allocate gdkpixbuf\n");
g_error ("Couldn't allocate gdkpixbuf");
}
/* Use pixbuf buffer to store decompressed data */
@ -430,7 +430,6 @@ image_load_increment (gpointer data, guchar *buf, guint size)
(* context->notify_func) (context->pixbuf,
context->notify_user_data);
src->start_of_file = FALSE;
} else if (!context->did_prescan) {
int rc;
@ -461,9 +460,11 @@ image_load_increment (gpointer data, guchar *buf, guint size)
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)