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Fill in the gif's blank areas for interlacing and progressive loading.

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1999-11-02  Jonathan Blandford  <jrb@redhat.com>

	* src/io-gif.c (gif_fill_in_lines): Fill in the gif's blank areas
	for interlacing and progressive loading.
This commit is contained in:
Jonathan Blandford 1999-11-03 00:20:27 +00:00 committed by Jonathan Blandford
parent 07c656cdf1
commit 1588285e3a
2 changed files with 64 additions and 2 deletions
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5
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,8 @@
1999-11-02 Jonathan Blandford <jrb@redhat.com>
* src/io-gif.c (gif_fill_in_lines): Fill in the gif's blank areas
for interlacing and progressive loading.
1999-11-02 Cody Russell <bratsche@dfw.net>
* src/gdk-pixbuf-drawable.c (gdk_pixbuf_from_drawable_core): Now
calls gdk_pixbuf_new_from_art_pixbuf() instead of gdk_pixbuf_new().

61
gdk-pixbuf/io-gif.c
View File

@ -155,7 +155,10 @@ static int count = 0;
static int
ReadOK (GifContext *context, guchar *buffer, size_t len)
{
gint retval, i;
gint retval;
#ifdef IO_GIFDEBUG
gint i;
#endif
if (context->file) {
count += len;
#ifdef IO_GIFDEBUG
@ -519,7 +522,8 @@ lwz_read_byte (GifContext *context)
int count;
unsigned char buf[260];
g_error (" DID WE EVER EVER GET HERE\n");
/*g_error (" DID WE EVER EVER GET HERE\n");*/
g_warning ("unhandled case. This won't load correctly\n");
if (ZeroDataBlock)
return -2;
@ -580,6 +584,56 @@ gif_set_get_lzw (GifContext *context)
context->draw_pass = 0;
}
static void
gif_fill_in_pixels (GifContext *context, guchar *dest, gint offset, guchar v)
{
guchar *pixel = NULL;
if (context->gif89.transparent) {
pixel = dest + (context->draw_ypos + offset) * gdk_pixbuf_get_rowstride (context->pixbuf) + context->draw_xpos * 4;
*pixel = context->color_map [0][(guchar) v];
*(pixel+1) = context->color_map [1][(guchar) v];
*(pixel+2) = context->color_map [2][(guchar) v];
*(pixel+3) = (guchar) ((v == context->gif89.transparent) ? 0 : 65535);
} else {
pixel = dest + (context->draw_ypos + offset) * gdk_pixbuf_get_rowstride (context->pixbuf) + context->draw_xpos * 3;
*pixel = context->color_map [0][(guchar) v];
*(pixel+1) = context->color_map [1][(guchar) v];
*(pixel+2) = context->color_map [2][(guchar) v];
}
}
/* only called if progressive and interlaced */
static void
gif_fill_in_lines (GifContext *context, guchar *dest, guchar v)
{
switch (context->draw_pass) {
case 0:
if (context->draw_ypos > 4) {
gif_fill_in_pixels (context, dest, -4, v);
gif_fill_in_pixels (context, dest, -3, v);
}
if (context->draw_ypos < (context->frame_height - 4)) {
gif_fill_in_pixels (context, dest, 3, v);
gif_fill_in_pixels (context, dest, 4, v);
}
case 1:
if (context->draw_ypos > 2)
gif_fill_in_pixels (context, dest, -2, v);
if (context->draw_ypos < (context->frame_height - 2))
gif_fill_in_pixels (context, dest, 2, v);
case 2:
if (context->draw_ypos > 1)
gif_fill_in_pixels (context, dest, -1, v);
if (context->draw_ypos < (context->frame_height - 1))
gif_fill_in_pixels (context, dest, 1, v);
case 3:
default:
break;
}
}
static int
gif_get_lzw (GifContext *context)
{
@ -619,6 +673,9 @@ gif_get_lzw (GifContext *context)
*(temp+2) = context->color_map [2][(guchar) v];
}
if (context->func && context->frame_interlace)
gif_fill_in_lines (context, dest, v);
context->draw_xpos++;
if (context->draw_xpos == context->frame_len) {
context->draw_xpos = 0;