From ae21e0878278a93b227233381e0f29c3e79980df Mon Sep 17 00:00:00 2001 From: Alexander Larsson Date: Thu, 19 Mar 2015 16:25:25 +0100 Subject: [PATCH] gtkcairoblur: Minor restructure This just moves get_box_filter_size to the top and makes it a macro (so it can be used as a constant later). https://bugzilla.gnome.org/show_bug.cgi?id=746468 --- gtk/gtkcairoblur.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/gtk/gtkcairoblur.c b/gtk/gtkcairoblur.c index 406e09b914..82f5d33f48 100644 --- a/gtk/gtkcairoblur.c +++ b/gtk/gtkcairoblur.c @@ -25,6 +25,19 @@ #include #include +/* + * Gets the size for a single box blur. + * + * Much of this, the 3 * sqrt(2 * pi) / 4, is the known value for + * approximating a Gaussian using box blurs. This yields quite a good + * approximation for a Gaussian. For more details, see: + * http://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement + * https://bugzilla.mozilla.org/show_bug.cgi?id=590039#c19 + */ +#define GAUSSIAN_SCALE_FACTOR ((3.0 * sqrt(2 * G_PI) / 4)) + +#define get_box_filter_size(radius) ((int)(GAUSSIAN_SCALE_FACTOR * radius)) + /* 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 * implement an efficient sliding window algorithm where we add @@ -140,23 +153,6 @@ flip_buffer (guchar *dst_buffer, #undef BLOCK_SIZE } -/* - * Gets the size for a single box blur. - * - * Much of this, the 3 * sqrt(2 * pi) / 4, is the known value for - * approximating a Gaussian using box blurs. This yields quite a good - * approximation for a Gaussian. For more details, see: - * http://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement - * https://bugzilla.mozilla.org/show_bug.cgi?id=590039#c19 - */ -#define GAUSSIAN_SCALE_FACTOR ((3.0 * sqrt(2 * G_PI) / 4)) - -static int -get_box_filter_size (double radius) -{ - return GAUSSIAN_SCALE_FACTOR * radius; -} - static void _boxblur (guchar *buffer, int width,