9b76ea070d
Improve gimp_gegl_mask_combine_ellipse_rect() -- the funciton
responsible for rendering ellipse/rounded-rectangle selections.
Most notably, this commit significantly improves the function's
performance, by identifying whole tiles, whole rows, or parts of a
row, that are fully inside, or fully outside, the ellipse, and
filling them in bulk, instead of calculating the anti-aliasing
value at each pixel, which is now only done along the
circumference.
This commit also improves anti-aliasing, by more accurately
approximating the distance from a pixel to the ellipse, and by
normalizing the distance according to the pixel's cross-section
length in the direction of the said point. In particular, we
guarantee that pixels that are fully inside/outside the ellipse
have a value of 1/0, respectively, facilitating the aforementioned
optimization.
Additionally, this commit fixes various edge cases where several
primitives coincide at a single pixel (in the rounded-rectangle
case), adds support for CHANNEL_OP_INTERSECT, and parallelizes
processing.
(cherry picked from commit 1044342393)
57 lines
2.8 KiB
C
57 lines
2.8 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_CHANNEL_COMBINE_H__
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#define __GIMP_CHANNEL_COMBINE_H__
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void gimp_channel_combine_rect (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h);
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void gimp_channel_combine_ellipse (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h,
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gboolean antialias);
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void gimp_channel_combine_ellipse_rect (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h,
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gdouble rx,
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gdouble ry,
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gboolean antialias);
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void gimp_channel_combine_mask (GimpChannel *mask,
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GimpChannel *add_on,
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GimpChannelOps op,
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gint off_x,
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gint off_y);
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void gimp_channel_combine_buffer (GimpChannel *mask,
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GeglBuffer *add_on_buffer,
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GimpChannelOps op,
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gint off_x,
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gint off_y);
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#endif /* __GIMP_CHANNEL_COMBINE_H__ */
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