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app: cache last-sampled gradient segment in GimpOperationBlend 

Remember the gradient segment at which the most-recent sample lies,
and pass it to gimp_gradient_get_color_at() as a seed for segement
lookup on the next sample.  This improves the performance
marginally.
This commit is contained in:
Ell 2017-08-12 11:15:21 -04:00
parent 4bfa6e716e
commit dfeafcb175
1 changed files with 22 additions and 18 deletions
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40
app/operations/gimpoperationblend.c
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@ -61,20 +61,22 @@ enum
typedef struct
{
GimpGradient *gradient;
gboolean reverse;
GimpGradient *gradient;
gboolean reverse;
#ifdef USE_GRADIENT_CACHE
GimpRGB *gradient_cache;
gint gradient_cache_size;
GimpRGB *gradient_cache;
gint gradient_cache_size;
#else
GimpGradientSegment *last_seg;
#endif
gdouble offset;
gdouble sx, sy;
GimpGradientType gradient_type;
gdouble dist;
gdouble vec[2];
GimpRepeatMode repeat;
GRand *seed;
GeglBuffer *dist_buffer;
gdouble offset;
gdouble sx, sy;
GimpGradientType gradient_type;
gdouble dist;
gdouble vec[2];
GimpRepeatMode repeat;
GRand *seed;
GeglBuffer *dist_buffer;
} RenderBlendData;
@ -922,8 +924,9 @@ gradient_render_pixel (gdouble x,
#ifdef USE_GRADIENT_CACHE
*color = rbd->gradient_cache[(gint) (factor * (rbd->gradient_cache_size - 1))];
#else
gimp_gradient_get_color_at (rbd->gradient, NULL, NULL,
factor, rbd->reverse, color);
rbd->last_seg = gimp_gradient_get_color_at (rbd->gradient, NULL,
rbd->last_seg, factor,
rbd->reverse, color);
#endif
}
}
@ -998,7 +1001,8 @@ gimp_operation_blend_process (GeglOperation *operation,
#ifdef USE_GRADIENT_CACHE
{
gint i;
GimpGradientSegment *last_seg = NULL;
gint i;
rbd.gradient_cache_size = ceil (sqrt (SQR (sx - ex) + SQR (sy - ey)));
rbd.gradient_cache = g_new0 (GimpRGB, rbd.gradient_cache_size);
@ -1007,9 +1011,9 @@ gimp_operation_blend_process (GeglOperation *operation,
{
gdouble factor = (gdouble) i / (gdouble) (rbd.gradient_cache_size - 1);
gimp_gradient_get_color_at (rbd.gradient, NULL, NULL,
factor, rbd.reverse,
rbd.gradient_cache + i);
last_seg = gimp_gradient_get_color_at (rbd.gradient, NULL, last_seg,
factor, rbd.reverse,
rbd.gradient_cache + i);
}
}
#endif