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gimp/app/core/gimpdrawable-blend.c
Sven Neumann 4f870bc132 deprecated RGB intensity functions and definitions. These coefficients do 
2005-08-03  Sven Neumann  <sven@gimp.org>

	* libgimpcolor/gimprgb.[ch]: deprecated RGB intensity functions
	and definitions. These coefficients do not accurately compute
	luminance for contemporary monitors. Instead the coefficients from
	the sRGB spec should be used which have now been added.

	* libgimpcolor/gimpcolor.def: updated.

	* libgimp/gimpdrawable.c
	* libgimp/gimppixelfetcher.c
	* app/base/colorize.c
	* app/base/levels.c
	* app/base/temp-buf.c
	* app/core/gimpdrawable-blend.c
	* app/core/gimpdrawable-convert.c
	* app/core/gimpdrawable-desaturate.c
	* app/core/gimpimage-convert.c
	* app/core/gimpimage.c
	* app/gui/splash.c
	* app/widgets/gimpgradienteditor.c
	* modules/colorsel_triangle.c
	* plug-ins/common/aa.c
	* plug-ins/common/bumpmap.c
	* plug-ins/common/colorify.c
	* plug-ins/common/despeckle.c
	* plug-ins/common/displace.c
	* plug-ins/common/engrave.c
	* plug-ins/common/gradmap.c
	* plug-ins/common/grid.c
	* plug-ins/common/mng.c
	* plug-ins/common/newsprint.c
	* plug-ins/common/png.c
	* plug-ins/common/whirlpinch.c
	* plug-ins/gflare/gflare.c
	* plug-ins/gfli/gfli.c
	* plug-ins/maze/handy.c
	* plug-ins/pagecurl/pagecurl.c: use gimp_rgb_luminance() and
	friends instead of the deprecated intensity functions.
2005-08-03 00:36:41 +00:00

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <glib-object.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "base/pixel-processor.h"
#include "base/pixel-region.h"
#include "base/tile.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "gimp.h"
#include "gimpchannel.h"
#include "gimpcontext.h"
#include "gimpdrawable-blend.h"
#include "gimpgradient.h"
#include "gimpimage.h"
#include "gimpprogress.h"
#include "gimp-intl.h"
typedef struct
{
GimpGradient *gradient;
gboolean reverse;
gdouble offset;
gdouble sx, sy;
GimpBlendMode blend_mode;
GimpGradientType gradient_type;
GimpRGB fg, bg;
gdouble dist;
gdouble vec[2];
GimpRepeatMode repeat;
GRand *seed;
} RenderBlendData;
typedef struct
{
PixelRegion *PR;
guchar *row_data;
gint bytes;
gint width;
GRand *dither_rand;
} PutPixelData;
/* local function prototypes */
static gdouble gradient_calc_conical_sym_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_conical_asym_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_square_factor (gdouble dist,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_radial_factor (gdouble dist,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_linear_factor (gdouble dist,
gdouble *vec,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_bilinear_factor (gdouble dist,
gdouble *vec,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_spiral_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y,
gboolean clockwise);
static gdouble gradient_calc_shapeburst_angular_factor (gdouble x,
gdouble y);
static gdouble gradient_calc_shapeburst_spherical_factor (gdouble x,
gdouble y);
static gdouble gradient_calc_shapeburst_dimpled_factor (gdouble x,
gdouble y);
static void gradient_precalc_shapeburst (GimpImage *gimage,
GimpDrawable *drawable,
PixelRegion *PR,
gdouble dist,
GimpProgress *progress);
static void gradient_render_pixel (gdouble x,
gdouble y,
GimpRGB *color,
gpointer render_data);
static void gradient_put_pixel (gint x,
gint y,
GimpRGB *color,
gpointer put_pixel_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,
GimpProgress *progress);
static void gradient_fill_single_region_rgb (RenderBlendData *rbd,
PixelRegion *PR);
static void gradient_fill_single_region_rgb_dither (RenderBlendData *rbd,
PixelRegion *PR);
static void gradient_fill_single_region_gray (RenderBlendData *rbd,
PixelRegion *PR);
static void gradient_fill_single_region_gray_dither (RenderBlendData *rbd,
PixelRegion *PR);
/* variables for the shapeburst algorithms */
static PixelRegion distR =
{
NULL, /* data */
NULL, /* tiles */
NULL, /* curtile */
0, 0, /* offx, offy */
0, /* rowstride */
0, 0, /* x, y */
0, 0, /* w, h */
4, /* bytes */
FALSE, /* dirty */
0 /* process count */
};
/* public functions */
void
gimp_drawable_blend (GimpDrawable *drawable,
GimpContext *context,
GimpBlendMode blend_mode,
GimpLayerModeEffects paint_mode,
GimpGradientType gradient_type,
gdouble opacity,
gdouble offset,
GimpRepeatMode repeat,
gboolean reverse,
gboolean supersample,
gint max_depth,
gdouble threshold,
gboolean dither,
gdouble startx,
gdouble starty,
gdouble endx,
gdouble endy,
GimpProgress *progress)
{
GimpImage *gimage;
TileManager *buf_tiles;
PixelRegion bufPR;
gint bytes;
gint x, y, width, height;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (GIMP_IS_CONTEXT (context));
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
return;
gimp_set_busy (gimage->gimp);
bytes = gimp_drawable_bytes (drawable);
/* Always create an alpha temp buf (for generality) */
if (! gimp_drawable_has_alpha (drawable))
bytes += 1;
buf_tiles = tile_manager_new (width, height, bytes);
pixel_region_init (&bufPR, buf_tiles, 0, 0, width, height, TRUE);
gradient_fill_region (gimage, drawable, context,
&bufPR, width, height,
blend_mode, gradient_type, offset, repeat, reverse,
supersample, max_depth, threshold, dither,
(startx - x), (starty - y),
(endx - x), (endy - y),
progress);
if (distR.tiles)
{
tile_manager_unref (distR.tiles);
distR.tiles = NULL;
}
pixel_region_init (&bufPR, buf_tiles, 0, 0, width, height, FALSE);
gimp_drawable_apply_region (drawable, &bufPR,
TRUE, _("Blend"),
opacity, paint_mode,
NULL, x, y);
/* update the image */
gimp_drawable_update (drawable, x, y, width, height);
/* free the temporary buffer */
tile_manager_unref (buf_tiles);
gimp_unset_busy (gimage->gimp);
}
static gdouble
gradient_calc_conical_sym_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else if ((x != 0) || (y != 0))
{
gdouble vec[2];
gdouble r;
gdouble rat;
/* Calculate offset from the start in pixels */
r = sqrt (x * x + y * y);
vec[0] = x / r;
vec[1] = y / r;
rat = axis[0] * vec[0] + axis[1] * vec[1]; /* Dot product */
if (rat > 1.0)
rat = 1.0;
else if (rat < -1.0)
rat = -1.0;
/* This cool idea is courtesy Josh MacDonald,
* Ali Rahimi --- two more XCF losers. */
rat = acos (rat) / G_PI;
rat = pow (rat, (offset / 10.0) + 1.0);
return CLAMP (rat, 0.0, 1.0);
}
else
{
return 0.5;
}
}
static gdouble
gradient_calc_conical_asym_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else if (x != 0 || y != 0)
{
gdouble ang0, ang1;
gdouble ang;
gdouble rat;
ang0 = atan2 (axis[0], axis[1]) + G_PI;
ang1 = atan2 (x, y) + G_PI;
ang = ang1 - ang0;
if (ang < 0.0)
ang += (2.0 * G_PI);
rat = ang / (2.0 * G_PI);
rat = pow (rat, (offset / 10.0) + 1.0);
return CLAMP (rat, 0.0, 1.0);
}
else
{
return 0.5; /* We are on middle point */
}
}
static gdouble
gradient_calc_square_factor (gdouble dist,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else
{
gdouble r;
gdouble rat;
/* Calculate offset from start as a value in [0, 1] */
offset = offset / 100.0;
r = MAX (abs (x), abs (y));
rat = r / dist;
if (rat < offset)
return 0.0;
else if (offset == 1.0)
return (rat >= 1.0) ? 1.0 : 0.0;
else
return (rat - offset) / (1.0 - offset);
}
}
static gdouble
gradient_calc_radial_factor (gdouble dist,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else
{
gdouble r;
gdouble rat;
/* Calculate radial offset from start as a value in [0, 1] */
offset = offset / 100.0;
r = sqrt (SQR (x) + SQR (y));
rat = r / dist;
if (rat < offset)
return 0.0;
else if (offset == 1.0)
return (rat >= 1.0) ? 1.0 : 0.0;
else
return (rat - offset) / (1.0 - offset);
}
}
static gdouble
gradient_calc_linear_factor (gdouble dist,
gdouble *vec,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else
{
gdouble r;
gdouble rat;
offset = offset / 100.0;
r = vec[0] * x + vec[1] * y;
rat = r / dist;
if (rat >= 0.0 && rat < offset)
return 0.0;
else if (offset == 1.0)
return (rat >= 1.0) ? 1.0 : 0.0;
else if (rat < 0.0)
return rat / (1.0 - offset);
else
return (rat - offset) / (1.0 - offset);
}
}
static gdouble
gradient_calc_bilinear_factor (gdouble dist,
gdouble *vec,
gdouble offset,
gdouble x,
gdouble y)
{
if (dist == 0.0)
{
return 0.0;
}
else
{
gdouble r;
gdouble rat;
/* Calculate linear offset from the start line outward */
offset = offset / 100.0;
r = vec[0] * x + vec[1] * y;
rat = r / dist;
if (fabs (rat) < offset)
return 0.0;
else if (offset == 1.0)
return (rat == 1.0) ? 1.0 : 0.0;
else
return (fabs (rat) - offset) / (1.0 - offset);
}
}
static gdouble
gradient_calc_spiral_factor (gdouble dist,
gdouble *axis,
gdouble offset,
gdouble x,
gdouble y,
gboolean clockwise)
{
if (dist == 0.0)
{
return 0.0;
}
else if (x != 0.0 || y != 0.0)
{
gdouble ang0, ang1;
gdouble ang;
double r;
ang0 = atan2 (axis[0], axis[1]) + G_PI;
ang1 = atan2 (x, y) + G_PI;
if (clockwise)
ang = ang1 - ang0;
else
ang = ang0 - ang1;
if (ang < 0.0)
ang += (2.0 * G_PI);
r = sqrt (SQR (x) + SQR (y)) / dist;
return fmod (ang / (2.0 * G_PI) + r + offset, 1.0);
}
else
{
return 0.5 ; /* We are on the middle point */
}
}
static gdouble
gradient_calc_shapeburst_angular_factor (gdouble x,
gdouble y)
{
Tile *tile;
gfloat value;
gint ix = CLAMP (x, 0.0, distR.w - 0.7);
gint iy = CLAMP (y, 0.0, distR.h - 0.7);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = 1.0 - *((gfloat *) tile_data_pointer (tile,
ix % TILE_WIDTH,
iy % TILE_HEIGHT));
tile_release (tile, FALSE);
return value;
}
static gdouble
gradient_calc_shapeburst_spherical_factor (gdouble x,
gdouble y)
{
Tile *tile;
gfloat value;
gint ix = CLAMP (x, 0.0, distR.w - 0.7);
gint iy = CLAMP (y, 0.0, distR.h - 0.7);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = *((gfloat *) tile_data_pointer (tile,
ix % TILE_WIDTH,
iy % TILE_HEIGHT));
value = 1.0 - sin (0.5 * G_PI * value);
tile_release (tile, FALSE);
return value;
}
static gdouble
gradient_calc_shapeburst_dimpled_factor (gdouble x,
gdouble y)
{
Tile *tile;
gfloat value;
gint ix = CLAMP (x, 0.0, distR.w - 0.7);
gint iy = CLAMP (y, 0.0, distR.h - 0.7);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = *((gfloat *) tile_data_pointer (tile,
ix % TILE_WIDTH,
iy % TILE_HEIGHT));
value = cos (0.5 * G_PI * value);
tile_release (tile, FALSE);
return value;
}
static void
gradient_precalc_shapeburst (GimpImage *gimage,
GimpDrawable *drawable,
PixelRegion *PR,
gdouble dist,
GimpProgress *progress)
{
GimpChannel *mask;
PixelRegion tempR;
gfloat max_iteration;
gfloat *distp;
gint size;
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);
}
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 ?
gimp_progress_update_and_flush : NULL,
progress);
/* 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 (gdouble x,
gdouble 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, NULL,
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 *dest = ppd->row_data + ppd->bytes * x;
if (ppd->bytes >= 3)
{
if (ppd->dither_rand)
{
gint i = g_rand_int (ppd->dither_rand);
*dest++ = color->r * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->g * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->b * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
else
{
*dest++ = ROUND (color->r * 255.0);
*dest++ = ROUND (color->g * 255.0);
*dest++ = ROUND (color->b * 255.0);
*dest++ = ROUND (color->a * 255.0);
}
}
else
{
/* Convert to grayscale */
gdouble gray = gimp_rgb_luminance (color);
if (ppd->dither_rand)
{
gint i = g_rand_int (ppd->dither_rand);
*dest++ = gray * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color->a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
else
{
*dest++ = ROUND (gray * 255.0);
*dest++ = ROUND (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,
GimpProgress *progress)
{
RenderBlendData rbd;
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);
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;
/* 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_rand = g_rand_new ();
gimp_adaptive_supersample_area (0, 0, (width - 1), (height - 1),
max_depth, threshold,
gradient_render_pixel, &rbd,
gradient_put_pixel, &ppd,
progress ?
gimp_progress_update_and_flush : NULL,
progress);
g_rand_free (ppd.dither_rand);
g_free (ppd.row_data);
}
else
{
PixelProcessorFunc func;
PixelProcessorProgressFunc progress_func = NULL;
if (dither)
{
rbd.seed = g_rand_new ();
if (PR->bytes >= 3)
func = (PixelProcessorFunc) gradient_fill_single_region_rgb_dither;
else
func = (PixelProcessorFunc) gradient_fill_single_region_gray_dither;
}
else
{
if (PR->bytes >= 3)
func = (PixelProcessorFunc) gradient_fill_single_region_rgb;
else
func = (PixelProcessorFunc) gradient_fill_single_region_gray;
}
if (progress)
progress_func = (PixelProcessorProgressFunc) gimp_progress_set_value;
pixel_regions_process_parallel_progress (func, &rbd,
progress_func, progress,
1, PR);
if (dither)
g_rand_free (rbd.seed);
}
}
static void
gradient_fill_single_region_rgb (RenderBlendData *rbd,
PixelRegion *PR)
{
guchar *dest = PR->data;
gint endx = PR->x + PR->w;
gint endy = PR->y + PR->h;
gint x, y;
for (y = PR->y; y < endy; y++)
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gradient_render_pixel (x, y, &color, rbd);
*dest++ = ROUND (color.r * 255.0);
*dest++ = ROUND (color.g * 255.0);
*dest++ = ROUND (color.b * 255.0);
*dest++ = ROUND (color.a * 255.0);
}
}
static void
gradient_fill_single_region_rgb_dither (RenderBlendData *rbd,
PixelRegion *PR)
{
GRand *dither_rand = g_rand_new_with_seed (g_rand_int (rbd->seed));
guchar *dest = PR->data;
gint endx = PR->x + PR->w;
gint endy = PR->y + PR->h;
gint x, y;
for (y = PR->y; y < endy; y++)
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gint i = g_rand_int (dither_rand);
gradient_render_pixel (x, y, &color, rbd);
*dest++ = color.r * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.g * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.b * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
g_rand_free (dither_rand);
}
static void
gradient_fill_single_region_gray (RenderBlendData *rbd,
PixelRegion *PR)
{
guchar *dest = PR->data;
gint endx = PR->x + PR->w;
gint endy = PR->y + PR->h;
gint x, y;
for (y = PR->y; y < endy; y++)
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gradient_render_pixel (x, y, &color, rbd);
*dest++ = gimp_rgb_luminance_uchar (&color);
*dest++ = ROUND (color.a * 255.0);
}
}
static void
gradient_fill_single_region_gray_dither (RenderBlendData *rbd,
PixelRegion *PR)
{
GRand *dither_rand = g_rand_new_with_seed (g_rand_int (rbd->seed));
guchar *dest = PR->data;
gint endx = PR->x + PR->w;
gint endy = PR->y + PR->h;
gint x, y;
for (y = PR->y; y < endy; y++)
for (x = PR->x; x < endx; x++)
{
GimpRGB color;
gdouble gray;
gint i = g_rand_int (dither_rand);
gradient_render_pixel (x, y, &color, rbd);
gray = gimp_rgb_luminance (&color);
*dest++ = gray * 255.0 + (gdouble) (i & 0xff) / 256.0; i >>= 8;
*dest++ = color.a * 255.0 + (gdouble) (i & 0xff) / 256.0;
}
g_rand_free (dither_rand);
}
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