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Bug 735895 - Precision Conversion "Dithering" dialog

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gimp_drawable_convert_type(): never dither when converting to a higher
bit depth, or to anything more than 16 bits.
This commit is contained in:
Michael Natterer 2016-11-09 12:45:52 +01:00
parent ab5a27d74a
commit 56ce447bc9
1 changed files with 19 additions and 0 deletions
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19
app/core/gimpdrawable.c
View file

@ -1040,7 +1040,10 @@ gimp_drawable_convert_type (GimpDrawable *drawable,
gboolean push_undo,
GimpProgress *progress)
{
const Babl *old_format;
const Babl *new_format;
gint old_bits;
gint new_bits;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (GIMP_IS_IMAGE (dest_image));
@ -1054,11 +1057,27 @@ gimp_drawable_convert_type (GimpDrawable *drawable,
if (! gimp_item_is_attached (GIMP_ITEM (drawable)))
push_undo = FALSE;
old_format = gimp_drawable_get_format (drawable);
new_format = gimp_image_get_format (dest_image,
new_base_type,
new_precision,
new_has_alpha);
old_bits = (babl_format_get_bytes_per_pixel (old_format) * 8 /
babl_format_get_n_components (old_format));
new_bits = (babl_format_get_bytes_per_pixel (new_format) * 8 /
babl_format_get_n_components (new_format));
if (old_bits <= new_bits || new_bits > 16)
{
/* don't dither if we are converting to a higher bit depth,
* or to more than 16 bits (gegl:color-reduction only does
* 16 bits).
*/
layer_dither_type = GEGL_DITHER_NONE;
mask_dither_type = GEGL_DITHER_NONE;
}
GIMP_DRAWABLE_GET_CLASS (drawable)->convert_type (drawable, dest_image,
new_format,
dest_profile,