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app: use gradient cache for conical gradients 

Add gimp_drawable_gradient_adjust_coords(), which adjusts the
gradient segment coords according to the gradient type, so that, in
cases where the gradient span is unrelated to the segment length,
the gradient cache (in GimpOperationGradient) is big enough not to
produce banding.  Use the new function in gimp_drawable_gradient()
and in the gradient tool, instead of duplicating the logic.

Move the shapreburst coordinate-adjustment logic to the new
function, and add appropriate logic for conical gradients.

Remove the code that avoids using the gradient cache for conical
gradients from GimpOperationGradient.
This commit is contained in:
Ell 2018-04-25 13:58:09 -04:00
parent 38ba45cf31
commit 5970046e25
4 changed files with 132 additions and 77 deletions
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86
app/core/gimpdrawable-gradient.c
View File

@ -21,6 +21,8 @@
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "gegl/gimp-gegl-apply-operation.h"
@ -93,17 +95,13 @@ gimp_drawable_gradient (GimpDrawable *drawable,
gimp_drawable_gradient_shapeburst_distmap (drawable, metric,
GEGL_RECTANGLE (x, y, width, height),
progress);
/* in shapeburst mode, make sure the "line" is long enough to
* span across the selection, so the operation's cache has the
* right size
*/
startx = x;
starty = y;
endx = x + width;
endy = y + height;
}
gimp_drawable_gradient_adjust_coords (drawable,
gradient_type,
GEGL_RECTANGLE (x, y, width, height),
&startx, &starty, &endx, &endy);
render = gegl_node_new_child (NULL,
"operation", "gimp:gradient",
"context", context,
@ -235,3 +233,73 @@ gimp_drawable_gradient_shapeburst_distmap (GimpDrawable *drawable,
return dist_buffer;
}
void
gimp_drawable_gradient_adjust_coords (GimpDrawable *drawable,
GimpGradientType gradient_type,
const GeglRectangle *region,
gdouble *startx,
gdouble *starty,
gdouble *endx,
gdouble *endy)
{
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (region != NULL);
g_return_if_fail (startx != NULL);
g_return_if_fail (starty != NULL);
g_return_if_fail (endx != NULL);
g_return_if_fail (endy != NULL);
/* we potentially adjust the gradient coordinates according to the gradient
* type, so that in cases where the gradient span is not related to the
* segment length, the gradient cache (in GimpOperationGradient) is big
* enough not to produce banding.
*/
switch (gradient_type)
{
/* for conical gradients, use a segment with the original origin and
* direction, whose length is the circumference of the largest circle
* centered at the origin, passing through one of the regions's vertices.
*/
case GIMP_GRADIENT_CONICAL_SYMMETRIC:
case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
{
gdouble r = 0.0;
GimpVector2 v;
r = MAX (r, hypot (region->x - *startx,
region->y - *starty));
r = MAX (r, hypot (region->x + region->width - *startx,
region->y - *starty));
r = MAX (r, hypot (region->x - *startx,
region->y + region->height - *starty));
r = MAX (r, hypot (region->x + region->width - *startx,
region->y + region->height - *starty));
gimp_vector2_set (&v, *endx - *startx, *endy - *starty);
gimp_vector2_normalize (&v);
gimp_vector2_mul (&v, 2.0 * G_PI * r);
*endx = *startx + v.x;
*endy = *starty + v.y;
}
break;
/* for shaped gradients, only the segment's length matters; use the
* regions's diagonal, which is the largest possible distance between two
* points in the region.
*/
case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
*startx = region->x;
*starty = region->y;
*endx = region->x + region->width;
*endy = region->y + region->height;
break;
default:
break;
}
}

57
app/core/gimpdrawable-gradient.h
View File

@ -19,32 +19,39 @@
#define __GIMP_DRAWABLE_GRADIENT_H__
void gimp_drawable_gradient (GimpDrawable *drawable,
GimpContext *context,
GimpGradient *gradient,
GeglDistanceMetric metric,
GimpLayerMode paint_mode,
GimpGradientType gradient_type,
gdouble opacity,
gdouble offset,
GimpRepeatMode repeat,
gboolean reverse,
GimpGradientBlendColorSpace blend_color_space,
gboolean supersample,
gint max_depth,
gdouble threshold,
gboolean dither,
gdouble startx,
gdouble starty,
gdouble endx,
gdouble endy,
GimpProgress *progress);
void gimp_drawable_gradient (GimpDrawable *drawable,
GimpContext *context,
GimpGradient *gradient,
GeglDistanceMetric metric,
GimpLayerMode paint_mode,
GimpGradientType gradient_type,
gdouble opacity,
gdouble offset,
GimpRepeatMode repeat,
gboolean reverse,
GimpGradientBlendColorSpace blend_color_space,
gboolean supersample,
gint max_depth,
gdouble threshold,
gboolean dither,
gdouble startx,
gdouble starty,
gdouble endx,
gdouble endy,
GimpProgress *progress);
GeglBuffer *
gimp_drawable_gradient_shapeburst_distmap (GimpDrawable *drawable,
GeglDistanceMetric metric,
const GeglRectangle *region,
GimpProgress *progress);
GeglBuffer * gimp_drawable_gradient_shapeburst_distmap (GimpDrawable *drawable,
GeglDistanceMetric metric,
const GeglRectangle *region,
GimpProgress *progress);
void gimp_drawable_gradient_adjust_coords (GimpDrawable *drawable,
GimpGradientType gradient_type,
const GeglRectangle *region,
gdouble *startx,
gdouble *starty,
gdouble *endx,
gdouble *endy);
#endif /* __GIMP_DRAWABLE_GRADIENT_H__ */

15
app/operations/gimpoperationgradient.c
View File

@ -1226,21 +1226,6 @@ gimp_operation_gradient_validate_cache (GimpOperationGradient *self)
return;
}
switch (self->gradient_type)
{
case GIMP_GRADIENT_CONICAL_SYMMETRIC:
case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
/* don't use a gradient cache for conical gradients, since the necessary
* cache size is not related to the line length
*/
g_mutex_unlock (&self->gradient_cache_mutex);
return;
default:
break;
}
cache_size = ceil (hypot (self->start_x - self->end_x,
self->start_y - self->end_y)) *
GRADIENT_CACHE_N_SUPERSAMPLES;

51
app/tools/gimpgradienttool.c
View File

@ -875,8 +875,9 @@ gimp_gradient_tool_create_graph (GimpGradientTool *gradient_tool)
static void
gimp_gradient_tool_update_graph (GimpGradientTool *gradient_tool)
{
GimpTool *tool = GIMP_TOOL (gradient_tool);
gint off_x, off_y;
GimpTool *tool = GIMP_TOOL (gradient_tool);
GimpGradientOptions *options = GIMP_GRADIENT_TOOL_GET_OPTIONS (gradient_tool);
gint off_x, off_y;
gimp_item_get_offset (GIMP_ITEM (tool->drawable), &off_x, &off_y);
@ -912,35 +913,29 @@ gimp_gradient_tool_update_graph (GimpGradientTool *gradient_tool)
else
#endif
{
if (gimp_gradient_tool_is_shapeburst (gradient_tool))
{
/* in shapeburst mode, make sure the "line" is long enough
* to span across the selection, so the operation's cache
* has the right size
*/
GeglRectangle roi;
gdouble start_x, start_y;
gdouble end_x, end_y;
GimpImage *image = gimp_display_get_image (tool->display);
gdouble x, y, w, h;
gimp_item_mask_intersect (GIMP_ITEM (tool->drawable),
&roi.x, &roi.y, &roi.width, &roi.height);
gimp_item_bounds_f (GIMP_ITEM (gimp_image_get_mask (image)),
&x, &y, &w, &h);
start_x = gradient_tool->start_x - off_x;
start_y = gradient_tool->start_y - off_y;
end_x = gradient_tool->end_x - off_x;
end_y = gradient_tool->end_y - off_y;
gegl_node_set (gradient_tool->render_node,
"start-x", x,
"start-y", y,
"end-x", x + w,
"end-y", y + h,
NULL);
}
else
{
gegl_node_set (gradient_tool->render_node,
"start-x", gradient_tool->start_x - off_x,
"start-y", gradient_tool->start_y - off_y,
"end-x", gradient_tool->end_x - off_x,
"end-y", gradient_tool->end_y - off_y,
NULL);
}
gimp_drawable_gradient_adjust_coords (tool->drawable,
options->gradient_type,
&roi,
&start_x, &start_y, &end_x, &end_y);
gegl_node_set (gradient_tool->render_node,
"start-x", start_x,
"start-y", start_y,
"end-x", end_x,
"end-y", end_y,
NULL);
}
}