4ce6aa5a29
When downscaling raster brushes, we currently resample the original
brush with no fitlering (other than bilinear interpolation), which
results in very noticable aliasing when using heavily downscaled
big brushes.
This commit constructs a box-filtered mipmap hierarchy for the
original brush on-demand, and the closest mipmap is used as the
resampling source for downscaled brushes, significantly improving
the output quality.
(cherry picked from commit ee39f0ec13)
48 lines
1.7 KiB
C
48 lines
1.7 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_BRUSH_PRIVATE_H__
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#define __GIMP_BRUSH_PRIVATE_H__
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struct _GimpBrushPrivate
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{
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GimpTempBuf *mask; /* the actual mask */
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GimpTempBuf *blurred_mask; /* blurred actual mask cached */
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GimpTempBuf *pixmap; /* optional pixmap data */
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GimpTempBuf *blurred_pixmap; /* optional pixmap data blurred cache */
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gdouble blur_hardness;
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gint n_horz_mipmaps;
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gint n_vert_mipmaps;
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GimpTempBuf **mask_mipmaps;
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GimpTempBuf **pixmap_mipmaps;
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gint spacing; /* brush's spacing */
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GimpVector2 x_axis; /* for calculating brush spacing */
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GimpVector2 y_axis; /* for calculating brush spacing */
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gint use_count; /* for keeping the caches alive */
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GimpBrushCache *mask_cache;
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GimpBrushCache *pixmap_cache;
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GimpBrushCache *boundary_cache;
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};
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#endif /* __GIMP_BRUSH_PRIVATE_H__ */
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