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Make the blur code compile with clang

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clang complains that the expression involving sqrt() is not
constant, and thus refuses to accept it as a case label. So,
use precomputed values instead.

https://bugzilla.gnome.org/show_bug.cgi?id=746468
This commit is contained in:
Matthias Clasen 2015-03-22 13:48:02 -04:00
parent 4ef0c34b65
commit 2a444e30f7
1 changed files with 23 additions and 10 deletions
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33
gtk/gtkcairoblur.c
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@ -36,7 +36,20 @@
*/
#define GAUSSIAN_SCALE_FACTOR ((3.0 * sqrt(2 * G_PI) / 4))
#define get_box_filter_size(radius) ((int)(GAUSSIAN_SCALE_FACTOR * radius))
#define get_box_filter_size(radius) ((int)(GAUSSIAN_SCALE_FACTOR * (radius)))
/* Sadly, clang is picky about get_box_filter_size(2) not being a
* constant expression, thus we have to use precomputed values.
*/
#define BOX_FILTER_SIZE_2 3
#define BOX_FILTER_SIZE_3 5
#define BOX_FILTER_SIZE_4 7
#define BOX_FILTER_SIZE_5 9
#define BOX_FILTER_SIZE_6 11
#define BOX_FILTER_SIZE_7 13
#define BOX_FILTER_SIZE_8 15
#define BOX_FILTER_SIZE_9 16
#define BOX_FILTER_SIZE_10 18
/* This applies a single box blur pass to a horizontal range of pixels;
* since the box blur has the same weight for all pixels, we can
@ -94,15 +107,15 @@ blur_xspan (guchar *row,
* divide operation (not radius 1, because its a no-op) */
switch (d)
{
case get_box_filter_size (2): BLUR_ROW_KERNEL (get_box_filter_size (2));
case get_box_filter_size (3): BLUR_ROW_KERNEL (get_box_filter_size (3));
case get_box_filter_size (4): BLUR_ROW_KERNEL (get_box_filter_size (4));
case get_box_filter_size (5): BLUR_ROW_KERNEL (get_box_filter_size (5));
case get_box_filter_size (6): BLUR_ROW_KERNEL (get_box_filter_size (6));
case get_box_filter_size (7): BLUR_ROW_KERNEL (get_box_filter_size (7));
case get_box_filter_size (8): BLUR_ROW_KERNEL (get_box_filter_size (8));
case get_box_filter_size (9): BLUR_ROW_KERNEL (get_box_filter_size (9));
case get_box_filter_size (10): BLUR_ROW_KERNEL (get_box_filter_size (10));
case BOX_FILTER_SIZE_2: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_2);
case BOX_FILTER_SIZE_3: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_3);
case BOX_FILTER_SIZE_4: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_4);
case BOX_FILTER_SIZE_5: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_5);
case BOX_FILTER_SIZE_6: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_6);
case BOX_FILTER_SIZE_7: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_7);
case BOX_FILTER_SIZE_8: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_8);
case BOX_FILTER_SIZE_9: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_9);
case BOX_FILTER_SIZE_10: BLUR_ROW_KERNEL (BOX_FILTER_SIZE_10);
default: BLUR_ROW_KERNEL (d);
}