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Fixed some issues with the PDB thumbnail functions spotted by Wolfgang 

2003-08-25  Sven Neumann  <sven@gimp.org>

	Fixed some issues with the PDB thumbnail functions spotted by
	Wolfgang Hofer and loosely based on patches he provided:

	* tools/pdbgen/pdb/fileops.pdb (file_load_thumbnail): keep a
	reference on the GimpImagefile as long as we need the associated
	preview temp_buf. Call gimp_imagefile_update() before requesting
	the preview.

	* app/pdb/fileops_cmds.c: regenerated.

	* app/base/temp-buf.c (temp_buf_new_check): use a checkerboard
	algorithm similar to the one the displayshell-render code uses.
This commit is contained in:
Sven Neumann 2003-08-25 11:35:16 +00:00 committed by Sven Neumann
parent 24f3da165b
commit 071f933cd7
4 changed files with 87 additions and 42 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2003-08-25 Sven Neumann <sven@gimp.org>
Fixed some issues with the PDB thumbnail functions spotted by
Wolfgang Hofer and loosely based on patches he provided:
* tools/pdbgen/pdb/fileops.pdb (file_load_thumbnail): keep a
reference on the GimpImagefile as long as we need the associated
preview temp_buf. Call gimp_imagefile_update() before requesting
the preview.
* app/pdb/fileops_cmds.c: regenerated.
* app/base/temp-buf.c (temp_buf_new_check): use a checkerboard
algorithm similar to the one the displayshell-render code uses.
2003-08-25 Michael Natterer <mitch@gimp.org>
* app/core/gimpobject.[ch]: changed GimpObject::get_memsize() to

54
app/base/temp-buf.c
View File

@ -95,7 +95,7 @@ temp_buf_to_color (TempBuf *src_buf,
*dest++ = tmpch;
}
break;
case 4:
g_return_if_fail (src_buf->bytes == 2);
while (num_pixels--)
@ -239,7 +239,7 @@ temp_buf_new (gint width,
}
/* This function simply renders a checkerboard with the given
parameters into a newly allocated tempbuf */
parameters into a newly allocated RGB tempbuf */
TempBuf *
temp_buf_new_check (gint width,
@ -250,25 +250,29 @@ temp_buf_new_check (gint width,
TempBuf *newbuf;
guchar *data;
guchar check_shift = 0;
guchar fg_color = 0;
guchar bg_color = 0;
gint i, j;
guchar check_mod = 0;
guchar fg_color = 0;
guchar bg_color = 0;
gint x, y;
g_return_val_if_fail (width > 0 && height > 0, NULL);
switch (check_size)
{
case GIMP_SMALL_CHECKS:
check_mod = 0x3;
check_shift = 2;
break;
case GIMP_MEDIUM_CHECKS:
check_shift = 4;
check_mod = 0x7;
check_shift = 3;
break;
case GIMP_LARGE_CHECKS:
check_shift = 6;
check_mod = 0xf;
check_shift = 4;
break;
}
switch (check_type)
{
case GIMP_LIGHT_CHECKS:
@ -295,18 +299,28 @@ temp_buf_new_check (gint width,
fg_color = 0;
bg_color = 0;
}
newbuf = temp_buf_new (width, height, 3, 0, 0, NULL);
data = temp_buf_data (newbuf);
for (i = 0, j = 1; i <= height; j++)
for (y = 0; y <= height; y++)
{
for (i = 1; i <= width; i++)
guchar dark = y >> check_shift;
guchar color = (dark & 0x1) ? bg_color : fg_color;
for (x = 0; x <= width; x++)
{
*(data + i - 1) = ((j & check_shift) && (i & check_shift))
? fg_color : bg_color;
}
}
*data++ = color;
*data++ = color;
*data++ = color;
if (((x + 1) & check_mod) == 0)
{
dark += 1;
color = (dark & 0x1) ? bg_color : fg_color;
}
}
}
return newbuf;
}
@ -393,7 +407,7 @@ temp_buf_resize (TempBuf *buf,
TempBuf *
temp_buf_scale (TempBuf *src,
gint new_width,
gint new_width,
gint new_height)
{
gint loop1;
@ -409,7 +423,7 @@ temp_buf_scale (TempBuf *src,
dest = temp_buf_new (new_width,
new_height,
src->bytes,
src->bytes,
0, 0, NULL);
src_data = temp_buf_data (src);
@ -417,7 +431,7 @@ temp_buf_scale (TempBuf *src,
x_ratio = (gdouble) src->width / (gdouble) new_width;
y_ratio = (gdouble) src->height / (gdouble) new_height;
for (loop1 = 0 ; loop1 < new_height ; loop1++)
{
for (loop2 = 0 ; loop2 < new_width ; loop2++)
@ -511,7 +525,7 @@ temp_buf_copy_area (TempBuf *src,
void
temp_buf_free (TempBuf *temp_buf)
{
{
g_return_if_fail (temp_buf != NULL);
if (temp_buf->data)
@ -622,7 +636,7 @@ mask_buf_data_clear (MaskBuf *mask_buf)
* from disk. In the former case, cached_in_memory is set to NULL;
* in the latter case, cached_in_memory is left unchanged.
* If temp_buf_swap_free is called, cached_in_memory must be checked
* against the temp buf being freed. If they are the same, then
* against the temp buf being freed. If they are the same, then
* cached_in_memory must be set to NULL;
*
* In the case where memory usage is set to "stingy":

30
app/pdb/fileops_cmds.c
View File

@ -258,14 +258,16 @@ file_load_thumbnail_invoker (Gimp *gimp,
if (imagefile)
{
gimp_imagefile_update (imagefile, GIMP_THUMBNAIL_SIZE_NORMAL);
temp_buf = gimp_viewable_get_preview (GIMP_VIEWABLE (imagefile),
GIMP_THUMBNAIL_SIZE_NORMAL,
GIMP_THUMBNAIL_SIZE_NORMAL,
GIMP_THUMBNAIL_SIZE_NORMAL);
g_object_unref (imagefile);
}
if (temp_buf)
{
TempBuf *checks = NULL;
width = temp_buf->width;
height = temp_buf->height;
@ -276,16 +278,18 @@ file_load_thumbnail_invoker (Gimp *gimp,
case 4:
{
guchar *src, *dest;
checks = temp_buf_new_check (width, height,
GIMP_GRAY_CHECKS,
GIMP_SMALL_CHECKS);
src = temp_buf_data (temp_buf);
dest = temp_buf_data (checks);
#define INT_MULT(a,b,t) ((t) = (a) * (b) + 0x80, ((((t) >> 8) + (t)) >> 8))
#define INT_BLEND(a,b,alpha,t) (INT_MULT((a)-(b), alpha, t) + (b))
TempBuf *checks = temp_buf_new_check (width, height,
GIMP_SMALL_CHECKS,
GIMP_GRAY_CHECKS);
guchar *src = temp_buf_data (temp_buf);
guchar *dest = temp_buf_data (checks);
num_bytes = width * height;
while (num_bytes--)
{
@ -298,7 +302,6 @@ file_load_thumbnail_invoker (Gimp *gimp,
dest += 3;
}
temp_buf_free (temp_buf);
temp_buf = checks;
}
break;
@ -311,7 +314,9 @@ file_load_thumbnail_invoker (Gimp *gimp,
num_bytes = 3 * width * height;
thumb_data = g_memdup (temp_buf_data (temp_buf), num_bytes);
temp_buf_free (temp_buf);
if (checks)
temp_buf_free (checks);
success = TRUE;
}
else
@ -319,6 +324,9 @@ file_load_thumbnail_invoker (Gimp *gimp,
success = FALSE;
}
if (imagefile)
g_object_unref (imagefile);
g_free (uri);
}

30
tools/pdbgen/pdb/fileops.pdb
View File

@ -217,14 +217,16 @@ HELP
if (imagefile)
{
gimp_imagefile_update (imagefile, GIMP_THUMBNAIL_SIZE_NORMAL);
temp_buf = gimp_viewable_get_preview (GIMP_VIEWABLE (imagefile),
GIMP_THUMBNAIL_SIZE_NORMAL,
GIMP_THUMBNAIL_SIZE_NORMAL,
GIMP_THUMBNAIL_SIZE_NORMAL);
g_object_unref (imagefile);
}
if (temp_buf)
{
TempBuf *checks = NULL;
width = temp_buf->width;
height = temp_buf->height;
@ -235,16 +237,18 @@ HELP
case 4:
{
guchar *src, *dest;
checks = temp_buf_new_check (width, height,
GIMP_GRAY_CHECKS,
GIMP_SMALL_CHECKS);
src = temp_buf_data (temp_buf);
dest = temp_buf_data (checks);
#define INT_MULT(a,b,t) ((t) = (a) * (b) + 0x80, ((((t) >> 8) + (t)) >> 8))
#define INT_BLEND(a,b,alpha,t) (INT_MULT((a)-(b), alpha, t) + (b))
TempBuf *checks = temp_buf_new_check (width, height,
GIMP_SMALL_CHECKS,
GIMP_GRAY_CHECKS);
guchar *src = temp_buf_data (temp_buf);
guchar *dest = temp_buf_data (checks);
num_bytes = width * height;
while (num_bytes--)
{
@ -257,7 +261,6 @@ HELP
dest += 3;
}
temp_buf_free (temp_buf);
temp_buf = checks;
}
break;
@ -270,7 +273,9 @@ HELP
num_bytes = 3 * width * height;
thumb_data = g_memdup (temp_buf_data (temp_buf), num_bytes);
temp_buf_free (temp_buf);
if (checks)
temp_buf_free (checks);
success = TRUE;
}
else
@ -278,6 +283,9 @@ HELP
success = FALSE;
}
if (imagefile)
g_object_unref (imagefile);
g_free (uri);
}
CODE