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gimp/app/core/gimpdrawable-blend.c

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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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