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added the update_func ability

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1999-11-04  Jonathan Blandford  <jrb@redhat.com>

	* src/io-gif.c (gif_get_lzw): added the update_func ability
This commit is contained in:
Jonathan Blandford 1999-11-04 20:34:24 +00:00 committed by Jonathan Blandford
parent 085a27d330
commit 76f716cec7
2 changed files with 64 additions and 9 deletions
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2
demos/testpixbuf.c
View File

@ -464,8 +464,6 @@ main (int argc, char **argv)
GdkPixbuf *pixbuf;
GdkPixbufLoader *pixbuf_loader;
FILE *file;
gint val;
guchar buf;
gtk_init (&argc, &argv);

71
gdk-pixbuf/io-gif.c
View File

@ -56,14 +56,16 @@
* <jrb@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <glib.h>
#include <string.h>
#include "gdk-pixbuf.h"
#include "gdk-pixbuf-io.h"
#define MAXCOLORMAPSIZE 256
#define MAX_LZW_BITS 12
@ -73,6 +75,8 @@
#define BitSet(byte, bit) (((byte) & (bit)) == (bit))
#define LM_to_uint(a,b) (((b)<<8)|(a))
typedef unsigned char CMap[3][MAXCOLORMAPSIZE];
/* Possible states we can be in. */
@ -173,6 +177,8 @@ struct _GifContext
static int GetDataBlock (GifContext *, unsigned char *);
#ifdef IO_GIFDEBUG
static int count = 0;
#endif
@ -226,8 +232,6 @@ gif_read (GifContext *context, guchar *buffer, size_t len)
return 0;
}
/* Changes the stage to be GIF_GET_COLORMAP */
static void
gif_set_get_colormap (GifContext *context)
@ -641,9 +645,11 @@ static int
gif_get_lzw (GifContext *context)
{
guchar *dest, *temp;
gint lower_bound, upper_bound; /* bounds for emitting the area_updated signal */
gboolean bound_flag;
gint first_pass; /* bounds for emitting the area_updated signal */
gint v;
if (context->pixbuf == NULL) {
context->pixbuf = gdk_pixbuf_new (ART_PIX_RGB,
context->gif89.transparent,
@ -656,12 +662,17 @@ gif_get_lzw (GifContext *context)
}
dest = gdk_pixbuf_get_pixels (context->pixbuf);
bound_flag = FALSE;
lower_bound = upper_bound = context->draw_ypos;
first_pass = context->draw_pass;
while (TRUE) {
v = lzw_read_byte (context);
if (v < 0) {
return v;
goto finished_data;
}
bound_flag = TRUE;
if (context->gif89.transparent) {
temp = dest + context->draw_ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + context->draw_xpos * 4;
@ -680,6 +691,7 @@ gif_get_lzw (GifContext *context)
gif_fill_in_lines (context, dest, v);
context->draw_xpos++;
if (context->draw_xpos == context->frame_len) {
context->draw_xpos = 0;
if (context->frame_interlace) {
@ -715,6 +727,15 @@ gif_get_lzw (GifContext *context)
} else {
context->draw_ypos++;
}
if (context->draw_pass != first_pass) {
if (context->draw_ypos > lower_bound) {
lower_bound = 0;
upper_bound = context->frame_height;
} else {
}
} else
upper_bound = context->draw_ypos;
}
if (context->draw_ypos >= context->frame_height)
break;
@ -722,7 +743,42 @@ gif_get_lzw (GifContext *context)
done:
/* we got enough data. there may be more (ie, newer layers) but we can quit now */
context->state = GIF_DONE;
return 0;
v = 0;
finished_data:
if (bound_flag && context->update_func) {
if (lower_bound <= upper_bound && first_pass == context->draw_pass) {
(* context->update_func)
(context->pixbuf,
context->user_data,
0, lower_bound,
gdk_pixbuf_get_width (context->pixbuf),
upper_bound - lower_bound);
} else {
if (lower_bound <= upper_bound) {
(* context->update_func)
(context->pixbuf,
context->user_data,
0, 0,
gdk_pixbuf_get_width (context->pixbuf),
gdk_pixbuf_get_height (context->pixbuf));
} else {
(* context->update_func)
(context->pixbuf,
context->user_data,
0, 0,
gdk_pixbuf_get_width (context->pixbuf),
upper_bound);
(* context->update_func)
(context->pixbuf,
context->user_data,
0, lower_bound,
gdk_pixbuf_get_width (context->pixbuf),
gdk_pixbuf_get_height (context->pixbuf));
}
}
}
return v;
}
static void
@ -978,6 +1034,7 @@ image_begin_load (ModulePreparedNotifyFunc prepare_func,
#endif
context = g_new (GifContext, 1);
context->prepare_func = prepare_func;
context->update_func = update_func;
context->user_data = user_data;
context->file = NULL;
context->pixbuf = NULL;