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fixed rounding so that all brush kernels are created with a constant sum

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2004-12-31  Sven Neumann  <sven@gimp.org>

	* tools/kernelgen.c: fixed rounding so that all brush kernels are
	created with a constant sum of 256.

	* app/paint/gimpbrushcore-kernels.h: regenerated.

	* app/paint/gimpbrushcore.c (gimp_brush_core_subsample_mask): use
	the constant defined un app/paint/gimpbrushcore-kernels.h. Should
	give a tiny speedup.
This commit is contained in:
Sven Neumann
2004-12-31 16:20:51 +00:00
committed by Sven Neumann
parent b650df0c8e
commit 515482fc20
4 changed files with 53 additions and 50 deletions
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12
tools/kernelgen.c
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@ -30,6 +30,7 @@
#define STEPS 64
#define KERNEL_WIDTH 3 /* changing these makes no sense */
#define KERNEL_HEIGHT 3 /* changing these makes no sense */
#define KERNEL_SUM 256
#define SUBSAMPLE 4
#define THRESHOLD 0.25 /* try to change this one */
@ -58,7 +59,7 @@ create_kernel (double x,
for (i = 0; i < STEPS * KERNEL_WIDTH; i++)
{
dist_x = x - (((double)i + 0.5) / (double)STEPS);
dist_x = x - (((double) i + 0.5) / (double) STEPS);
/* I've tried to use a gauss function here instead of a
threshold, but the result was not that impressive. */
@ -73,8 +74,8 @@ create_kernel (double x,
{
for (i = 0; i < KERNEL_WIDTH; i++)
{
w = 256.0 * (value[i][j] / sum);
printf (" %3d,", (int)w);
w = (double) KERNEL_SUM * value[i][j] / sum;
printf (" %3d,", (int) (w + 0.5));
}
}
}
@ -96,6 +97,7 @@ main (int argc,
printf ("#define KERNEL_WIDTH %d\n", KERNEL_WIDTH);
printf ("#define KERNEL_HEIGHT %d\n", KERNEL_HEIGHT);
printf ("#define KERNEL_SUBSAMPLE %d\n", SUBSAMPLE);
printf ("#define KERNEL_SUM %d\n", KERNEL_SUM);
printf ("\n\n");
printf ("/* Brush pixel subsampling kernels */\n");
printf ("static const int subsample[%d][%d][%d] =\n{\n",
@ -103,13 +105,13 @@ main (int argc,
for (j = 0; j <= SUBSAMPLE; j++)
{
y = (double)j / (double)(SUBSAMPLE);
y = (double) j / (double) SUBSAMPLE;
printf (" {\n");
for (i = 0; i <= SUBSAMPLE; i++)
{
x = (double)i / (double)(SUBSAMPLE);
x = (double) i / (double) SUBSAMPLE;
printf (" {");
create_kernel (x, y);