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major speedup for dithering code thanks to a suggestion from Jay Cox. 

2005-02-28  Sven Neumann  <sven@gimp.org>

	* app/core/gimpdrawable-blend.c: major speedup for dithering code
	thanks to a suggestion from Jay Cox.
This commit is contained in:
Sven Neumann 2005-02-28 21:52:41 +00:00 committed by Sven Neumann
parent c0c6d837c0
commit d9e6ef3d93
2 changed files with 26 additions and 23 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-02-28 Sven Neumann <sven@gimp.org>
* app/core/gimpdrawable-blend.c: major speedup for dithering code
thanks to a suggestion from Jay Cox.
2005-02-28 Sven Neumann <sven@gimp.org>
* app/widgets/gimphelp.c (gimp_help_get_locales): use

44
app/core/gimpdrawable-blend.c
View File

@ -178,17 +178,6 @@ static PixelRegion distR =
};
#define gradient_dither(dest, rng, value) G_STMT_START { \
gdouble ftmp = (value) * 255.0; \
gint itmp = ftmp; \
\
if (g_rand_double (rng) > ftmp - itmp) \
*dest++ = itmp; \
else \
*dest++ = MIN (itmp + 1, 255); \
} G_STMT_END
/* public functions */
void
@ -813,10 +802,12 @@ gradient_put_pixel (gint x,
{
if (ppd->dither_rand)
{
gradient_dither (dest, ppd->dither_rand, color->r);
gradient_dither (dest, ppd->dither_rand, color->g);
gradient_dither (dest, ppd->dither_rand, color->b);
gradient_dither (dest, ppd->dither_rand, color->a);
gint i = g_rand_int (ppd->dither_rand);
*dest++ = color->r * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->g * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->b * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
else
{
@ -833,8 +824,10 @@ gradient_put_pixel (gint x,
if (ppd->dither_rand)
{
gradient_dither (dest, ppd->dither_rand, gray);
gradient_dither (dest, ppd->dither_rand, color->a);
gint i = g_rand_int (ppd->dither_rand);
*dest++ = gray * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
else
{
@ -1056,13 +1049,14 @@ gradient_fill_single_region_rgb_dither (RenderBlendData *rbd,
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gint i = g_rand_int (dither_rand);
gradient_render_pixel (x, y, &color, rbd);
gradient_dither (dest, dither_rand, color.r);
gradient_dither (dest, dither_rand, color.g);
gradient_dither (dest, dither_rand, color.b);
gradient_dither (dest, dither_rand, color.a);
*dest++ = color.r * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.g * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.b * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
g_rand_free (dither_rand);
@ -1103,11 +1097,15 @@ gradient_fill_single_region_gray_dither (RenderBlendData *rbd,
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gdouble gray;
gint i = g_rand_int (dither_rand);
gradient_render_pixel (x, y, &color, rbd);
gradient_dither (dest, dither_rand, gimp_rgb_intensity (&color));
gradient_dither (dest, dither_rand, color.a);
gray = gimp_rgb_intensity (&color);
*dest++ = gray * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
g_rand_free (dither_rand);