mirror of https://github.com/GNOME/gimp.git
1143 lines
31 KiB
C
1143 lines
31 KiB
C
/* The GIMP -- an 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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <glib-object.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "core-types.h"
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#include "base/pixel-region.h"
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#include "base/tile.h"
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#include "base/tile-manager.h"
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#include "paint-funcs/paint-funcs.h"
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#include "gimp.h"
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#include "gimpchannel.h"
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#include "gimpcontext.h"
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#include "gimpdrawable-blend.h"
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#include "gimpgradient.h"
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#include "gimpimage.h"
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#include "gimp-intl.h"
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typedef struct
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{
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GimpGradient *gradient;
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gboolean reverse;
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gdouble offset;
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gdouble sx, sy;
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GimpBlendMode blend_mode;
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GimpGradientType gradient_type;
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GimpRGB fg, bg;
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gdouble dist;
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gdouble vec[2];
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GimpRepeatMode repeat;
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} RenderBlendData;
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typedef struct
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{
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PixelRegion *PR;
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guchar *row_data;
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gint bytes;
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gint width;
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gboolean dither;
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GRand *dither_rand;
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} PutPixelData;
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/* local function prototypes */
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static gdouble gradient_calc_conical_sym_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_conical_asym_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_square_factor (gdouble dist,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_radial_factor (gdouble dist,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_linear_factor (gdouble dist,
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gdouble *vec,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_bilinear_factor (gdouble dist,
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gdouble *vec,
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gdouble offset,
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gdouble x,
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gdouble y);
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static gdouble gradient_calc_spiral_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y,
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gboolean clockwise);
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static gdouble gradient_calc_shapeburst_angular_factor (gdouble x,
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gdouble y);
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static gdouble gradient_calc_shapeburst_spherical_factor (gdouble x,
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gdouble y);
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static gdouble gradient_calc_shapeburst_dimpled_factor (gdouble x,
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gdouble y);
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static void gradient_precalc_shapeburst (GimpImage *gimage,
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GimpDrawable *drawable,
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PixelRegion *PR,
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gdouble dist,
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GimpProgressFunc progress_callback,
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gpointer progress_data);
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static void gradient_render_pixel (gdouble x,
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gdouble y,
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GimpRGB *color,
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gpointer render_data);
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static void gradient_put_pixel (gint x,
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gint y,
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GimpRGB *color,
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gpointer put_pixel_data);
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static void gradient_fill_region (GimpImage *gimage,
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GimpDrawable *drawable,
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GimpContext *context,
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PixelRegion *PR,
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gint width,
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gint height,
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GimpBlendMode blend_mode,
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GimpGradientType gradient_type,
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gdouble offset,
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GimpRepeatMode repeat,
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gboolean reverse,
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gboolean supersample,
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gint max_depth,
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gdouble threshold,
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gboolean dither,
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gdouble sx,
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gdouble sy,
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gdouble ex,
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gdouble ey,
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GimpProgressFunc progress_callback,
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gpointer progress_data);
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/* variables for the shapeburst algs */
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static PixelRegion distR =
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{
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NULL, /* data */
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NULL, /* tiles */
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0, /* rowstride */
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0, 0, /* w, h */
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0, 0, /* x, y */
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4, /* bytes */
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0 /* process count */
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};
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/* public functions */
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void
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gimp_drawable_blend (GimpDrawable *drawable,
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GimpContext *context,
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GimpBlendMode blend_mode,
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GimpLayerModeEffects paint_mode,
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GimpGradientType gradient_type,
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gdouble opacity,
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gdouble offset,
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GimpRepeatMode repeat,
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gboolean reverse,
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gboolean supersample,
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gint max_depth,
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gdouble threshold,
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gboolean dither,
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gdouble startx,
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gdouble starty,
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gdouble endx,
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gdouble endy,
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GimpProgressFunc progress_callback,
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gpointer progress_data)
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{
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GimpImage *gimage;
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TileManager *buf_tiles;
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PixelRegion bufPR;
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gint bytes;
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gint x1, y1, x2, y2;
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g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
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g_return_if_fail (GIMP_IS_CONTEXT (context));
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gimage = gimp_item_get_image (GIMP_ITEM (drawable));
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g_return_if_fail (GIMP_IS_IMAGE (gimage));
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gimp_set_busy (gimage->gimp);
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gimp_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
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bytes = gimp_drawable_bytes (drawable);
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/* Always create an alpha temp buf (for generality) */
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if (! gimp_drawable_has_alpha (drawable))
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{
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bytes += 1;
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}
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buf_tiles = tile_manager_new ((x2 - x1), (y2 - y1), bytes);
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pixel_region_init (&bufPR, buf_tiles, 0, 0, (x2 - x1), (y2 - y1), TRUE);
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gradient_fill_region (gimage, drawable, context,
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&bufPR, (x2 - x1), (y2 - y1),
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blend_mode, gradient_type, offset, repeat, reverse,
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supersample, max_depth, threshold, dither,
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(startx - x1), (starty - y1),
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(endx - x1), (endy - y1),
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progress_callback, progress_data);
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if (distR.tiles)
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{
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tile_manager_unref (distR.tiles);
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distR.tiles = NULL;
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}
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pixel_region_init (&bufPR, buf_tiles, 0, 0, (x2 - x1), (y2 - y1), FALSE);
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gimp_drawable_apply_region (drawable, &bufPR,
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TRUE, _("Blend"),
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opacity, paint_mode,
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NULL, x1, y1);
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/* update the image */
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gimp_drawable_update (drawable, x1, y1, x2 - x1, y2 - y1);
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/* free the temporary buffer */
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tile_manager_unref (buf_tiles);
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gimp_unset_busy (gimage->gimp);
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}
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static gdouble
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gradient_calc_conical_sym_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble vec[2];
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gdouble r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else if ((x != 0) || (y != 0))
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{
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/* Calculate offset from the start in pixels */
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r = sqrt (x * x + y * y);
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vec[0] = x / r;
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vec[1] = y / r;
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rat = axis[0] * vec[0] + axis[1] * vec[1]; /* Dot product */
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if (rat > 1.0)
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rat = 1.0;
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else if (rat < -1.0)
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rat = -1.0;
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/* This cool idea is courtesy Josh MacDonald,
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* Ali Rahimi --- two more XCF losers. */
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rat = acos (rat) / G_PI;
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rat = pow (rat, (offset / 10.0) + 1.0);
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rat = CLAMP (rat, 0.0, 1.0);
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}
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else
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{
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rat = 0.5;
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}
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return rat;
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}
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static gdouble
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gradient_calc_conical_asym_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble ang0, ang1;
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gdouble ang;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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if ((x != 0) || (y != 0))
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{
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ang0 = atan2 (axis[0], axis[1]) + G_PI;
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ang1 = atan2 (x, y) + G_PI;
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ang = ang1 - ang0;
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if (ang < 0.0)
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ang += (2.0 * G_PI);
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rat = ang / (2.0 * G_PI);
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rat = pow (rat, (offset / 10.0) + 1.0);
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rat = CLAMP (rat, 0.0, 1.0);
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}
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else
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{
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rat = 0.5; /* We are on middle point */
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}
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}
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return rat;
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}
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static gdouble
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gradient_calc_square_factor (gdouble dist,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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/* Calculate offset from start as a value in [0, 1] */
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offset = offset / 100.0;
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r = MAX (abs (x), abs (y));
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rat = r / dist;
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if (rat < offset)
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rat = 0.0;
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else if (offset == 1.0)
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rat = (rat >= 1.0) ? 1.0 : 0.0;
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else
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rat = (rat - offset) / (1.0 - offset);
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}
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return rat;
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}
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static gdouble
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gradient_calc_radial_factor (gdouble dist,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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/* Calculate radial offset from start as a value in [0, 1] */
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offset = offset / 100.0;
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r = sqrt (SQR (x) + SQR (y));
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rat = r / dist;
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if (rat < offset)
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rat = 0.0;
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else if (offset == 1.0)
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rat = (rat >= 1.0) ? 1.0 : 0.0;
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else
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rat = (rat - offset) / (1.0 - offset);
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}
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return rat;
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}
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static gdouble
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gradient_calc_linear_factor (gdouble dist,
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gdouble *vec,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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offset = offset / 100.0;
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r = vec[0] * x + vec[1] * y;
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rat = r / dist;
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if (rat >= 0.0 && rat < offset)
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rat = 0.0;
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else if (offset == 1.0)
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rat = (rat >= 1.0) ? 1.0 : 0.0;
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else if (rat < 0.0)
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rat = rat / (1.0 - offset);
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else
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rat = (rat - offset) / (1.0 - offset);
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}
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return rat;
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}
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static gdouble
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gradient_calc_bilinear_factor (gdouble dist,
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gdouble *vec,
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gdouble offset,
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gdouble x,
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gdouble y)
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{
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gdouble r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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/* Calculate linear offset from the start line outward */
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offset = offset / 100.0;
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r = vec[0] * x + vec[1] * y;
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rat = r / dist;
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if (fabs (rat) < offset)
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rat = 0.0;
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else if (offset == 1.0)
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rat = (rat == 1.0) ? 1.0 : 0.0;
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else
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rat = (fabs (rat) - offset) / (1.0 - offset);
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}
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return rat;
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}
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static gdouble
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gradient_calc_spiral_factor (gdouble dist,
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gdouble *axis,
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gdouble offset,
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gdouble x,
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gdouble y,
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gboolean clockwise)
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{
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gdouble ang0, ang1;
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gdouble ang, r;
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gdouble rat;
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if (dist == 0.0)
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{
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rat = 0.0;
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}
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else
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{
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if (x != 0.0 || y != 0.0)
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{
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ang0 = atan2 (axis[0], axis[1]) + G_PI;
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ang1 = atan2 (x, y) + G_PI;
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if (clockwise)
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ang = ang1 - ang0;
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else
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ang = ang0 - ang1;
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if (ang < 0.0)
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ang += (2.0 * G_PI);
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r = sqrt (x * x + y * y) / dist;
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rat = ang / (2.0 * G_PI) + r + offset;
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rat = fmod (rat, 1.0);
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}
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else
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rat = 0.5 ; /* We are on the middle point */
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}
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return rat;
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}
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static gdouble
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gradient_calc_shapeburst_angular_factor (gdouble x,
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gdouble y)
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{
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gint ix, iy;
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Tile *tile;
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gfloat value;
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ix = (gint) CLAMP (x, 0.0, distR.w - 0.7);
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iy = (gint) CLAMP (y, 0.0, distR.h - 0.7);
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tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
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value = 1.0 - *((gfloat *) tile_data_pointer (tile,
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ix % TILE_WIDTH,
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iy % TILE_HEIGHT));
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tile_release (tile, FALSE);
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return value;
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}
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static gdouble
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gradient_calc_shapeburst_spherical_factor (gdouble x,
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gdouble y)
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{
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gint ix, iy;
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Tile *tile;
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gfloat value;
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ix = (gint) CLAMP (x, 0.0, distR.w - 0.7);
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iy = (gint) CLAMP (y, 0.0, distR.h - 0.7);
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tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
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value = *((gfloat *) tile_data_pointer (tile,
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ix % TILE_WIDTH,
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iy % TILE_HEIGHT));
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value = 1.0 - sin (0.5 * G_PI * value);
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tile_release (tile, FALSE);
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return value;
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}
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static gdouble
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gradient_calc_shapeburst_dimpled_factor (gdouble x,
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gdouble y)
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{
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gint ix, iy;
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Tile *tile;
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gfloat value;
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ix = (gint) CLAMP (x, 0.0, distR.w - 0.7);
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iy = (gint) CLAMP (y, 0.0, distR.h - 0.7);
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tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
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value = *((gfloat *) tile_data_pointer (tile,
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ix % TILE_WIDTH,
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iy % TILE_HEIGHT));
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value = cos (0.5 * G_PI * value);
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tile_release (tile, FALSE);
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return value;
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}
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static void
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gradient_precalc_shapeburst (GimpImage *gimage,
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GimpDrawable *drawable,
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PixelRegion *PR,
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gdouble dist,
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GimpProgressFunc progress_callback,
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gpointer progress_data)
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{
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GimpChannel *mask;
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PixelRegion tempR;
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gfloat max_iteration;
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gfloat *distp;
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gint size;
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|
gpointer pr;
|
|
guchar white[1] = { OPAQUE_OPACITY };
|
|
|
|
/* allocate the distance map */
|
|
distR.tiles = tile_manager_new (PR->w, PR->h, sizeof (gfloat));
|
|
|
|
/* allocate the selection mask copy */
|
|
tempR.tiles = tile_manager_new (PR->w, PR->h, 1);
|
|
pixel_region_init (&tempR, tempR.tiles, 0, 0, PR->w, PR->h, TRUE);
|
|
|
|
mask = gimp_image_get_mask (gimage);
|
|
|
|
/* If the gimage mask is not empty, use it as the shape burst source */
|
|
if (! gimp_channel_is_empty (mask))
|
|
{
|
|
PixelRegion maskR;
|
|
gint x1, y1, x2, y2;
|
|
gint offx, offy;
|
|
|
|
gimp_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
|
|
gimp_item_offsets (GIMP_ITEM (drawable), &offx, &offy);
|
|
|
|
pixel_region_init (&maskR, gimp_drawable_data (GIMP_DRAWABLE (mask)),
|
|
x1 + offx, y1 + offy, (x2 - x1), (y2 - y1), FALSE);
|
|
|
|
/* copy the mask to the temp mask */
|
|
copy_region (&maskR, &tempR);
|
|
}
|
|
/* otherwise... */
|
|
else
|
|
{
|
|
/* If the intended drawable has an alpha channel, use that */
|
|
if (gimp_drawable_has_alpha (drawable))
|
|
{
|
|
PixelRegion drawableR;
|
|
|
|
pixel_region_init (&drawableR, gimp_drawable_data (drawable),
|
|
PR->x, PR->y, PR->w, PR->h, FALSE);
|
|
|
|
extract_alpha_region (&drawableR, NULL, &tempR);
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, just fill the shapeburst to white */
|
|
color_region (&tempR, white);
|
|
}
|
|
}
|
|
|
|
pixel_region_init (&tempR, tempR.tiles, 0, 0, PR->w, PR->h, TRUE);
|
|
pixel_region_init (&distR, distR.tiles, 0, 0, PR->w, PR->h, TRUE);
|
|
max_iteration = shapeburst_region (&tempR, &distR, progress_callback, progress_data);
|
|
|
|
/* normalize the shapeburst with the max iteration */
|
|
if (max_iteration > 0)
|
|
{
|
|
pixel_region_init (&distR, distR.tiles, 0, 0, PR->w, PR->h, TRUE);
|
|
|
|
for (pr = pixel_regions_register (1, &distR);
|
|
pr != NULL;
|
|
pr = pixel_regions_process (pr))
|
|
{
|
|
distp = (gfloat *) distR.data;
|
|
size = distR.w * distR.h;
|
|
|
|
while (size--)
|
|
*distp++ /= max_iteration;
|
|
}
|
|
|
|
pixel_region_init (&distR, distR.tiles, 0, 0, PR->w, PR->h, FALSE);
|
|
}
|
|
|
|
tile_manager_unref (tempR.tiles);
|
|
}
|
|
|
|
|
|
static void
|
|
gradient_render_pixel (double x,
|
|
double y,
|
|
GimpRGB *color,
|
|
gpointer render_data)
|
|
{
|
|
RenderBlendData *rbd = render_data;
|
|
gdouble factor;
|
|
|
|
/* Calculate blending factor */
|
|
|
|
switch (rbd->gradient_type)
|
|
{
|
|
case GIMP_GRADIENT_LINEAR:
|
|
factor = gradient_calc_linear_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_BILINEAR:
|
|
factor = gradient_calc_bilinear_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_RADIAL:
|
|
factor = gradient_calc_radial_factor (rbd->dist, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SQUARE:
|
|
factor = gradient_calc_square_factor (rbd->dist, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_CONICAL_SYMMETRIC:
|
|
factor = gradient_calc_conical_sym_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
|
|
factor = gradient_calc_conical_asym_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
|
|
factor = gradient_calc_shapeburst_angular_factor (x, y);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
|
|
factor = gradient_calc_shapeburst_spherical_factor (x, y);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
|
|
factor = gradient_calc_shapeburst_dimpled_factor (x, y);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
|
|
factor = gradient_calc_spiral_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy,TRUE);
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
|
|
factor = gradient_calc_spiral_factor (rbd->dist, rbd->vec, rbd->offset,
|
|
x - rbd->sx, y - rbd->sy,FALSE);
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached ();
|
|
return;
|
|
}
|
|
|
|
/* Adjust for repeat */
|
|
|
|
switch (rbd->repeat)
|
|
{
|
|
case GIMP_REPEAT_NONE:
|
|
factor = CLAMP (factor, 0.0, 1.0);
|
|
break;
|
|
|
|
case GIMP_REPEAT_SAWTOOTH:
|
|
factor = factor - floor (factor);
|
|
break;
|
|
|
|
case GIMP_REPEAT_TRIANGULAR:
|
|
{
|
|
guint ifactor;
|
|
|
|
if (factor < 0.0)
|
|
factor = -factor;
|
|
|
|
ifactor = (guint) factor;
|
|
factor = factor - floor (factor);
|
|
|
|
if (ifactor & 1)
|
|
factor = 1.0 - factor;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Blend the colors */
|
|
|
|
if (rbd->blend_mode == GIMP_CUSTOM_MODE)
|
|
{
|
|
gimp_gradient_get_color_at (rbd->gradient, factor, rbd->reverse, color);
|
|
}
|
|
else
|
|
{
|
|
/* Blend values */
|
|
|
|
if (rbd->reverse)
|
|
factor = 1.0 - factor;
|
|
|
|
color->r = rbd->fg.r + (rbd->bg.r - rbd->fg.r) * factor;
|
|
color->g = rbd->fg.g + (rbd->bg.g - rbd->fg.g) * factor;
|
|
color->b = rbd->fg.b + (rbd->bg.b - rbd->fg.b) * factor;
|
|
color->a = rbd->fg.a + (rbd->bg.a - rbd->fg.a) * factor;
|
|
|
|
if (rbd->blend_mode == GIMP_FG_BG_HSV_MODE)
|
|
{
|
|
GimpHSV hsv = *((GimpHSV *) color);
|
|
|
|
gimp_hsv_to_rgb (&hsv, color);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
gradient_put_pixel (gint x,
|
|
gint y,
|
|
GimpRGB *color,
|
|
gpointer put_pixel_data)
|
|
{
|
|
PutPixelData *ppd = put_pixel_data;
|
|
guchar *data;
|
|
|
|
/* Paint */
|
|
|
|
data = ppd->row_data + ppd->bytes * x;
|
|
|
|
if (ppd->bytes >= 3)
|
|
{
|
|
if (ppd->dither)
|
|
{
|
|
gdouble dither_prob;
|
|
gdouble ftmp;
|
|
gint itmp;
|
|
|
|
ftmp = color->r * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
color->r += (1.0 / 255.0);
|
|
|
|
ftmp = color->g * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
color->g += (1.0 / 255.0);
|
|
|
|
ftmp = color->b * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
color->b += (1.0 / 255.0);
|
|
|
|
ftmp = color->a * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
color->a += (1.0 / 255.0);
|
|
|
|
if (color->r > 1.0) color->r = 1.0;
|
|
if (color->g > 1.0) color->g = 1.0;
|
|
if (color->b > 1.0) color->b = 1.0;
|
|
if (color->a > 1.0) color->a = 1.0;
|
|
}
|
|
|
|
*data++ = color->r * 255.0;
|
|
*data++ = color->g * 255.0;
|
|
*data++ = color->b * 255.0;
|
|
*data++ = color->a * 255.0;
|
|
}
|
|
else
|
|
{
|
|
/* Convert to grayscale */
|
|
gdouble gray = gimp_rgb_intensity (color);
|
|
|
|
if (ppd->dither)
|
|
{
|
|
gdouble dither_prob;
|
|
gdouble ftmp;
|
|
gint itmp;
|
|
|
|
ftmp = gray * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
gray += (1.0 / 255.0);
|
|
|
|
ftmp = color->a * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (ppd->dither_rand) < dither_prob)
|
|
color->a += (1.0 / 255.0);
|
|
|
|
if (gray > 1.0) gray = 1.0;
|
|
if (color->a > 1.0) color->a = 1.0;
|
|
}
|
|
|
|
*data++ = gray * 255.0;
|
|
*data++ = color->a * 255.0;
|
|
}
|
|
|
|
/* Paint whole row if we are on the rightmost pixel */
|
|
|
|
if (x == (ppd->width - 1))
|
|
pixel_region_set_row (ppd->PR, 0, y, ppd->width, ppd->row_data);
|
|
}
|
|
|
|
static void
|
|
gradient_fill_region (GimpImage *gimage,
|
|
GimpDrawable *drawable,
|
|
GimpContext *context,
|
|
PixelRegion *PR,
|
|
gint width,
|
|
gint height,
|
|
GimpBlendMode blend_mode,
|
|
GimpGradientType gradient_type,
|
|
gdouble offset,
|
|
GimpRepeatMode repeat,
|
|
gboolean reverse,
|
|
gboolean supersample,
|
|
gint max_depth,
|
|
gdouble threshold,
|
|
gboolean dither,
|
|
gdouble sx,
|
|
gdouble sy,
|
|
gdouble ex,
|
|
gdouble ey,
|
|
GimpProgressFunc progress_callback,
|
|
gpointer progress_data)
|
|
{
|
|
RenderBlendData rbd;
|
|
gint x, y;
|
|
gint endx, endy;
|
|
gpointer pr;
|
|
guchar *data;
|
|
GimpRGB color;
|
|
GRand *dither_rand = NULL;
|
|
|
|
rbd.gradient = gimp_context_get_gradient (context);
|
|
rbd.reverse = reverse;
|
|
|
|
gimp_context_get_foreground (context, &rbd.fg);
|
|
gimp_context_get_background (context, &rbd.bg);
|
|
|
|
switch (blend_mode)
|
|
{
|
|
case GIMP_FG_BG_RGB_MODE:
|
|
break;
|
|
|
|
case GIMP_FG_BG_HSV_MODE:
|
|
/* Convert to HSV */
|
|
{
|
|
GimpHSV fg_hsv;
|
|
GimpHSV bg_hsv;
|
|
|
|
gimp_rgb_to_hsv (&rbd.fg, &fg_hsv);
|
|
gimp_rgb_to_hsv (&rbd.bg, &bg_hsv);
|
|
|
|
memcpy (&rbd.fg, &fg_hsv, sizeof (GimpRGB));
|
|
memcpy (&rbd.bg, &bg_hsv, sizeof (GimpRGB));
|
|
}
|
|
break;
|
|
|
|
case GIMP_FG_TRANSPARENT_MODE:
|
|
/* Color does not change, just the opacity */
|
|
|
|
rbd.bg = rbd.fg;
|
|
rbd.bg.a = GIMP_OPACITY_TRANSPARENT;
|
|
break;
|
|
|
|
case GIMP_CUSTOM_MODE:
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
|
|
/* Calculate type-specific parameters */
|
|
|
|
switch (gradient_type)
|
|
{
|
|
case GIMP_GRADIENT_RADIAL:
|
|
rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SQUARE:
|
|
rbd.dist = MAX (fabs (ex - sx), fabs (ey - sy));
|
|
break;
|
|
|
|
case GIMP_GRADIENT_CONICAL_SYMMETRIC:
|
|
case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
|
|
case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
|
|
case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
|
|
case GIMP_GRADIENT_LINEAR:
|
|
case GIMP_GRADIENT_BILINEAR:
|
|
rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
|
|
|
|
if (rbd.dist > 0.0)
|
|
{
|
|
rbd.vec[0] = (ex - sx) / rbd.dist;
|
|
rbd.vec[1] = (ey - sy) / rbd.dist;
|
|
}
|
|
|
|
break;
|
|
|
|
case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
|
|
case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
|
|
case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
|
|
rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
|
|
gradient_precalc_shapeburst (gimage, drawable, PR, rbd.dist,
|
|
progress_callback, progress_data);
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
|
|
/* Initialize render data */
|
|
|
|
rbd.offset = offset;
|
|
rbd.sx = sx;
|
|
rbd.sy = sy;
|
|
rbd.blend_mode = blend_mode;
|
|
rbd.gradient_type = gradient_type;
|
|
rbd.repeat = repeat;
|
|
|
|
if (dither)
|
|
dither_rand = g_rand_new ();
|
|
|
|
/* Render the gradient! */
|
|
|
|
if (supersample)
|
|
{
|
|
PutPixelData ppd;
|
|
|
|
ppd.PR = PR;
|
|
ppd.row_data = g_malloc (width * PR->bytes);
|
|
ppd.bytes = PR->bytes;
|
|
ppd.width = width;
|
|
ppd.dither = dither;
|
|
ppd.dither_rand = dither_rand;
|
|
|
|
gimp_adaptive_supersample_area (0, 0, (width - 1), (height - 1),
|
|
max_depth, threshold,
|
|
gradient_render_pixel, &rbd,
|
|
gradient_put_pixel, &ppd,
|
|
progress_callback, progress_data);
|
|
|
|
g_free (ppd.row_data);
|
|
}
|
|
else
|
|
{
|
|
gint max_progress = PR->w * PR->h;
|
|
gint progress = 0;
|
|
|
|
for (pr = pixel_regions_register (1, PR);
|
|
pr != NULL;
|
|
pr = pixel_regions_process (pr))
|
|
{
|
|
data = PR->data;
|
|
endx = PR->x + PR->w;
|
|
endy = PR->y + PR->h;
|
|
|
|
for (y = PR->y; y < endy; y++)
|
|
{
|
|
for (x = PR->x; x < endx; x++)
|
|
{
|
|
gradient_render_pixel (x, y, &color, &rbd);
|
|
|
|
if (PR->bytes >= 3)
|
|
{
|
|
if (dither)
|
|
{
|
|
gdouble dither_prob;
|
|
gdouble ftmp;
|
|
gint itmp;
|
|
|
|
ftmp = color.r * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
color.r += (1.0 / 255.0);
|
|
|
|
ftmp = color.g * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
color.g += (1.0 / 255.0);
|
|
|
|
ftmp = color.b * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
color.b += (1.0 / 255.0);
|
|
|
|
ftmp = color.a * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
color.a += (1.0 / 255.0);
|
|
|
|
if (color.r > 1.0) color.r = 1.0;
|
|
if (color.g > 1.0) color.g = 1.0;
|
|
if (color.b > 1.0) color.b = 1.0;
|
|
if (color.a > 1.0) color.a = 1.0;
|
|
}
|
|
|
|
*data++ = color.r * 255.0;
|
|
*data++ = color.g * 255.0;
|
|
*data++ = color.b * 255.0;
|
|
*data++ = color.a * 255.0;
|
|
}
|
|
else
|
|
{
|
|
/* Convert to grayscale */
|
|
gdouble gray = gimp_rgb_intensity (&color);
|
|
|
|
if (dither)
|
|
{
|
|
gdouble dither_prob;
|
|
gdouble ftmp;
|
|
gint itmp;
|
|
|
|
ftmp = gray * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
gray += (1.0 / 255.0);
|
|
|
|
ftmp = color.a * 255.0;
|
|
itmp = ftmp;
|
|
dither_prob = ftmp - itmp;
|
|
|
|
if (g_rand_double (dither_rand) < dither_prob)
|
|
color.a += (1.0 / 255.0);
|
|
|
|
if (gray > 1.0) gray = 1.0;
|
|
if (color.a > 1.0) color.a = 1.0;
|
|
}
|
|
|
|
*data++ = gray * 255.0;
|
|
*data++ = color.a * 255.0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (progress_callback)
|
|
{
|
|
progress += PR->w * PR->h;
|
|
(* progress_callback) (0, max_progress, progress, progress_data);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (dither)
|
|
g_rand_free (dither_rand);
|
|
}
|