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Call the update_area callback depending on the number of rows loaded in

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1999-11-22  Havoc Pennington  <hp@pobox.com>

* src/io-png.c (image_load_increment): Call the update_area
callback depending on the number of rows loaded in this increment.

* src/testpixbuf.c (main): slow down the progressive load demo
This commit is contained in:
Havoc Pennington 1999-11-22 23:04:52 +00:00 committed by Havoc Pennington
parent 33da844e70
commit 4cbca90747
2 changed files with 98 additions and 10 deletions
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11
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,14 @@
1999-11-22 Havoc Pennington <hp@pobox.com>
* src/io-png.c (image_load_increment): Call the update_area
callback depending on the number of rows loaded in this increment.
* src/testpixbuf.c (main): slow down the progressive load demo
1999-11-16 Havoc Pennington <hp@pobox.com>
* src/gdk-pixbuf-drawable.h: Get the quotes right on the #include
1999-11-22 Jonathan Blandford <jrb@redhat.com>
* configure.in (GDK_PIXBUF_DIR): make the symlink. Does not work

97
gdk-pixbuf/io-png.c
View File

@ -247,10 +247,27 @@ struct _LoadContext {
png_structp png_read_ptr;
png_infop png_info_ptr;
ModulePreparedNotifyFunc notify_func;
ModulePreparedNotifyFunc prepare_func;
ModuleUpdatedNotifyFunc update_func;
gpointer notify_user_data;
GdkPixbuf* pixbuf;
/* row number of first row seen, or -1 if none yet seen */
gint first_row_seen_in_chunk;
/* pass number for the first row seen */
gint first_pass_seen_in_chunk;
/* row number of last row seen */
gint last_row_seen_in_chunk;
gint last_pass_seen_in_chunk;
/* highest row number seen */
gint max_row_seen_in_chunk;
guint fatal_error_occurred : 1;
@ -267,9 +284,16 @@ image_begin_load (ModulePreparedNotifyFunc prepare_func,
lc->fatal_error_occurred = FALSE;
lc->notify_func = prepare_func;
lc->prepare_func = prepare_func;
lc->update_func = update_func;
lc->notify_user_data = user_data;
lc->first_row_seen_in_chunk = -1;
lc->last_row_seen_in_chunk = -1;
lc->first_pass_seen_in_chunk = -1;
lc->last_pass_seen_in_chunk = -1;
lc->max_row_seen_in_chunk = -1;
/* Create the main PNG context struct */
lc->png_read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
@ -322,13 +346,60 @@ image_load_increment(gpointer context, guchar *buf, guint size)
g_return_val_if_fail(lc != NULL, FALSE);
/* reset */
lc->first_row_seen_in_chunk = -1;
lc->last_row_seen_in_chunk = -1;
lc->first_pass_seen_in_chunk = -1;
lc->last_pass_seen_in_chunk = -1;
lc->max_row_seen_in_chunk = -1;
/* Invokes our callbacks as needed */
png_process_data(lc->png_read_ptr, lc->png_info_ptr, buf, size);
if (lc->fatal_error_occurred)
return FALSE;
else
else {
if (lc->first_row_seen_in_chunk >= 0) {
/* We saw at least one row */
gint pass_diff = lc->last_pass_seen_in_chunk - lc->first_pass_seen_in_chunk;
g_assert(pass_diff >= 0);
if (pass_diff == 0) {
/* start and end row were in the same pass */
(lc->update_func)(lc->pixbuf, lc->notify_user_data, 0,
lc->first_row_seen_in_chunk,
lc->pixbuf->art_pixbuf->width,
(lc->last_row_seen_in_chunk -
lc->first_row_seen_in_chunk) + 1);
} else if (pass_diff == 1) {
/* We have from the first row seen to
the end of the image (max row
seen), then from the top of the
image to the last row seen */
/* first row to end */
(lc->update_func)(lc->pixbuf, lc->notify_user_data, 0,
lc->first_row_seen_in_chunk,
lc->pixbuf->art_pixbuf->width,
(lc->max_row_seen_in_chunk -
lc->first_row_seen_in_chunk) + 1);
/* top to last row */
(lc->update_func)(lc->pixbuf, lc->notify_user_data,
0, 0,
lc->pixbuf->art_pixbuf->width,
lc->last_row_seen_in_chunk + 1);
} else {
/* We made at least one entire pass, so update the
whole image */
(lc->update_func)(lc->pixbuf, lc->notify_user_data,
0, 0,
lc->pixbuf->art_pixbuf->width,
lc->max_row_seen_in_chunk + 1);
}
}
return TRUE;
}
}
/* Called at the start of the progressive load, once we have image info */
@ -372,8 +443,8 @@ png_info_callback (png_structp png_read_ptr,
/* Notify the client that we are ready to go */
if (lc->notify_func)
(* lc->notify_func) (lc->pixbuf, lc->notify_user_data);
if (lc->prepare_func)
(* lc->prepare_func) (lc->pixbuf, lc->notify_user_data);
return;
}
@ -388,12 +459,21 @@ png_row_callback (png_structp png_read_ptr,
{
LoadContext* lc;
guchar* old_row = NULL;
lc = png_get_progressive_ptr(png_read_ptr);
if (lc->fatal_error_occurred)
return;
if (lc->first_row_seen_in_chunk < 0) {
lc->first_row_seen_in_chunk = row_num;
lc->first_pass_seen_in_chunk = pass_num;
}
lc->max_row_seen_in_chunk = MAX(lc->max_row_seen_in_chunk, ((gint)row_num));
lc->last_row_seen_in_chunk = row_num;
lc->last_pass_seen_in_chunk = pass_num;
old_row = lc->pixbuf->art_pixbuf->pixels + (row_num * lc->pixbuf->art_pixbuf->rowstride);
png_progressive_combine_row(lc->png_read_ptr, old_row, new_row);
@ -410,11 +490,8 @@ png_end_callback (png_structp png_read_ptr,
if (lc->fatal_error_occurred)
return;
/* Doesn't do anything for now */
}
static void
png_error_callback(png_structp png_read_ptr,
png_const_charp error_msg)