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gimp/app/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 "appenv.h"
#include "asupsample.h"
#include "blend.h"
#include "cursorutil.h"
#include "draw_core.h"
#include "drawable.h"
#include "errors.h"
#include "fuzzy_select.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gradient.h"
#include "interface.h"
#include "paint_options.h"
#include "palette.h"
#include "selection.h"
#include "tool_options_ui.h"
#include "tools.h"
#include "undo.h"
#include "tile.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimpmath.h"
/* target size */
#define TARGET_HEIGHT 15
#define TARGET_WIDTH 15
#define STATUSBAR_SIZE 128
/* the blend structures */
typedef double (*RepeatFunc)(double);
typedef struct _BlendTool BlendTool;
struct _BlendTool
{
DrawCore * core; /* Core select object */
int startx; /* starting x coord */
int starty; /* starting y coord */
int endx; /* ending x coord */
int endy; /* ending y coord */
guint context_id; /* for the statusbar */
};
typedef struct _BlendOptions BlendOptions;
struct _BlendOptions
{
PaintOptions paint_options;
double offset;
double offset_d;
GtkObject *offset_w;
BlendMode blend_mode;
BlendMode blend_mode_d;
GtkWidget *blend_mode_w;
GradientType gradient_type;
GradientType gradient_type_d;
GtkWidget *gradient_type_w;
RepeatMode repeat;
RepeatMode repeat_d;
GtkWidget *repeat_w;
int supersample;
int supersample_d;
GtkWidget *supersample_w;
int max_depth;
int max_depth_d;
GtkObject *max_depth_w;
double threshold;
double threshold_d;
GtkObject *threshold_w;
};
typedef struct
{
double offset;
double sx, sy;
BlendMode blend_mode;
GradientType gradient_type;
color_t fg, bg;
double dist;
double vec[2];
RepeatFunc repeat_func;
} RenderBlendData;
typedef struct
{
PixelRegion *PR;
unsigned char *row_data;
int bytes;
int width;
} PutPixelData;
/* the blend tool options */
static BlendOptions *blend_options = NULL;
/* variables for the shapeburst algs */
static PixelRegion distR =
{
NULL, /* data */
NULL, /* tiles */
0, /* rowstride */
0, 0, /* w, h */
0, 0, /* x, y */
4, /* bytes */
0 /* process count */
};
/* local function prototypes */
static void gradient_type_callback (GtkWidget *, gpointer);
static void blend_mode_callback (GtkWidget *, gpointer);
static void repeat_type_callback (GtkWidget *, gpointer);
static void blend_button_press (Tool *, GdkEventButton *, gpointer);
static void blend_button_release (Tool *, GdkEventButton *, gpointer);
static void blend_motion (Tool *, GdkEventMotion *, gpointer);
static void blend_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void blend_control (Tool *, ToolAction, gpointer);
static double gradient_calc_conical_sym_factor (double dist, double *axis, double offset,
double x, double y);
static double gradient_calc_conical_asym_factor (double dist, double *axis, double offset,
double x, double y);
static double gradient_calc_square_factor (double dist, double offset,
double x, double y);
static double gradient_calc_radial_factor (double dist, double offset,
double x, double y);
static double gradient_calc_linear_factor (double dist, double *vec,
double x, double y);
static double gradient_calc_bilinear_factor (double dist, double *vec, double offset,
double x, double y);
static double gradient_calc_spiral_factor (double dist, double *axis, double offset,
double x, double y,gint cwise);
static double gradient_calc_shapeburst_angular_factor (double x, double y);
static double gradient_calc_shapeburst_spherical_factor (double x, double y);
static double gradient_calc_shapeburst_dimpled_factor (double x, double y);
static double gradient_repeat_none(double val);
static double gradient_repeat_sawtooth(double val);
static double gradient_repeat_triangular(double val);
static void gradient_precalc_shapeburst (GImage *gimage, GimpDrawable *drawable, PixelRegion *PR, double dist);
static void gradient_render_pixel(double x, double y, color_t *color, void *render_data);
static void gradient_put_pixel(int x, int y, color_t color, void *put_pixel_data);
static void gradient_fill_region (GImage *gimage, GimpDrawable *drawable, PixelRegion *PR,
int width, int height,
BlendMode blend_mode, GradientType gradient_type,
double offset, RepeatMode repeat,
int supersample, int max_depth, double threshold,
double sx, double sy, double ex, double ey,
progress_func_t progress_callback,
void *progress_data);
static void calc_rgb_to_hsv(double *r, double *g, double *b);
static void calc_hsv_to_rgb(double *h, double *s, double *v);
/* functions */
static void
blend_mode_callback (GtkWidget *widget,
gpointer client_data)
{
blend_options->blend_mode = (BlendMode) client_data;
}
static void
gradient_type_callback (GtkWidget *widget,
gpointer client_data)
{
blend_options->gradient_type = (GradientType) client_data;
gtk_widget_set_sensitive (blend_options->repeat_w,
(blend_options->gradient_type < 6));
}
static void
repeat_type_callback (GtkWidget *widget,
gpointer client_data)
{
blend_options->repeat = (RepeatMode) client_data;
}
static void
blend_options_reset ()
{
BlendOptions *options = blend_options;
paint_options_reset ((PaintOptions *) options);
options->blend_mode = options->blend_mode_d;
options->gradient_type = options->gradient_type_d;
options->repeat = options->repeat_d;
gtk_option_menu_set_history (GTK_OPTION_MENU (blend_options->blend_mode_w), 0);
gtk_option_menu_set_history (GTK_OPTION_MENU (options->gradient_type_w), 0);
gtk_option_menu_set_history (GTK_OPTION_MENU (blend_options->repeat_w), 0);
gtk_adjustment_set_value (GTK_ADJUSTMENT (blend_options->offset_w),
blend_options->offset_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (blend_options->supersample_w),
blend_options->supersample_d);
gtk_adjustment_set_value (GTK_ADJUSTMENT (blend_options->max_depth_w),
blend_options->max_depth_d);
gtk_adjustment_set_value (GTK_ADJUSTMENT (blend_options->threshold_w),
blend_options->threshold_d);
}
static BlendOptions *
blend_options_new ()
{
BlendOptions *options;
GtkWidget *vbox;
GtkWidget *abox;
GtkWidget *label;
GtkWidget *menu;
GtkWidget *table;
GtkWidget *scale;
GtkWidget *frame;
static MenuItem blend_option_items[] =
{
{ N_("FG to BG (RGB)"), 0, 0, blend_mode_callback,
(gpointer) FG_BG_RGB_MODE, NULL, NULL },
{ N_("FG to BG (HSV)"), 0, 0, blend_mode_callback,
(gpointer) FG_BG_HSV_MODE, NULL, NULL },
{ N_("FG to Transparent"), 0, 0, blend_mode_callback,
(gpointer) FG_TRANS_MODE, NULL, NULL },
{ N_("Custom from editor"), 0, 0, blend_mode_callback,
(gpointer) CUSTOM_MODE, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
static MenuItem gradient_option_items[] =
{
{ N_("Linear"), 0, 0, gradient_type_callback,
(gpointer) LINEAR, NULL, NULL },
{ N_("Bi-Linear"), 0, 0, gradient_type_callback,
(gpointer) BILINEAR, NULL, NULL },
{ N_("Radial"), 0, 0, gradient_type_callback,
(gpointer) RADIAL, NULL, NULL },
{ N_("Square"), 0, 0, gradient_type_callback,
(gpointer) SQUARE, NULL, NULL },
{ N_("Conical (symmetric)"), 0, 0, gradient_type_callback,
(gpointer) CONICAL_SYMMETRIC, NULL, NULL },
{ N_("Conical (asymmetric)"), 0, 0, gradient_type_callback,
(gpointer) CONICAL_ASYMMETRIC, NULL, NULL },
{ N_("Shapeburst (angular)"), 0, 0, gradient_type_callback,
(gpointer) SHAPEBURST_ANGULAR, NULL, NULL },
{ N_("Shapeburst (spherical)"), 0, 0, gradient_type_callback,
(gpointer) SHAPEBURST_SPHERICAL, NULL, NULL },
{ N_("Shapeburst (dimpled)"), 0, 0, gradient_type_callback,
(gpointer) SHAPEBURST_DIMPLED, NULL, NULL },
{ N_("Spiral (clockwise)"), 0, 0, gradient_type_callback,
(gpointer) SPIRAL_CLOCKWISE, NULL, NULL },
{ N_("Spiral (anticlockwise)"), 0, 0, gradient_type_callback,
(gpointer) SPIRAL_ANTICLOCKWISE, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
static MenuItem repeat_option_items[] =
{
{ N_("None"), 0, 0, repeat_type_callback,
(gpointer) REPEAT_NONE, NULL, NULL },
{ N_("Sawtooth wave"), 0, 0, repeat_type_callback,
(gpointer) REPEAT_SAWTOOTH, NULL, NULL },
{ N_("Triangular wave"), 0, 0, repeat_type_callback,
(gpointer) REPEAT_TRIANGULAR, NULL, NULL },
{ NULL, 0, 0, NULL, NULL, NULL, NULL }
};
/* the new blend tool options structure */
options = (BlendOptions *) g_malloc (sizeof (BlendOptions));
paint_options_init ((PaintOptions *) options,
BLEND,
blend_options_reset);
options->offset = options->offset_d = 0.0;
options->blend_mode = options->blend_mode_d = FG_BG_RGB_MODE;
options->gradient_type = options->gradient_type_d = LINEAR;
options->repeat = options->repeat_d = REPEAT_NONE;
options->supersample = options->supersample_d = FALSE;
options->max_depth = options->max_depth_d = 3;
options->threshold = options->threshold_d = 0.2;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the offset scale */
table = gtk_table_new (4, 2, FALSE);
gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 1);
gtk_table_set_row_spacing (GTK_TABLE (table), 0, 2);
gtk_box_pack_start (GTK_BOX (vbox), table, TRUE, TRUE, 0);
label = gtk_label_new (_("Offset:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
options->offset_w =
gtk_adjustment_new (options->offset_d, 0.0, 100.0, 1.0, 1.0, 0.0);
gtk_signal_connect (GTK_OBJECT (options->offset_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->offset);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->offset_w));
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, 0, 1);
gtk_widget_show (scale);
/* the blend mode menu */
label = gtk_label_new (_("Blend:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 2);
gtk_widget_show (label);
abox = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
gtk_table_attach_defaults (GTK_TABLE (table), abox, 1, 2, 1, 2);
gtk_widget_show (abox);
options->blend_mode_w = gtk_option_menu_new ();
gtk_container_add (GTK_CONTAINER (abox), options->blend_mode_w);
gtk_widget_show (options->blend_mode_w);
menu = build_menu (blend_option_items, NULL);
gtk_option_menu_set_menu (GTK_OPTION_MENU (options->blend_mode_w), menu);
/* the gradient type menu */
label = gtk_label_new (_("Gradient:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
abox = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
gtk_table_attach_defaults (GTK_TABLE (table), abox, 1, 2, 2, 3);
gtk_widget_show (abox);
options->gradient_type_w = gtk_option_menu_new ();
gtk_container_add (GTK_CONTAINER (abox), options->gradient_type_w);
gtk_widget_show (options->gradient_type_w);
menu = build_menu (gradient_option_items, NULL);
gtk_option_menu_set_menu (GTK_OPTION_MENU (options->gradient_type_w), menu);
/* the repeat option */
label = gtk_label_new (_("Repeat:"));
gtk_misc_set_alignment (GTK_MISC( label), 1.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 3, 4,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
abox = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
gtk_table_attach_defaults (GTK_TABLE (table), abox, 1, 2, 3, 4);
gtk_widget_show (abox);
options->repeat_w = gtk_option_menu_new ();
gtk_container_add (GTK_CONTAINER (abox), options->repeat_w);
gtk_widget_show (options->repeat_w);
menu = build_menu (repeat_option_items, NULL);
gtk_option_menu_set_menu (GTK_OPTION_MENU (options->repeat_w), menu);
/* show the table */
gtk_widget_show (table);
/* frame for supersampling options */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
/* vbox for the supersampling stuff */
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox);
gtk_widget_show (vbox);
/* supersampling toggle */
options->supersample_w =
gtk_check_button_new_with_label (_("Adaptive supersampling"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->supersample_w),
options->supersample_d);
gtk_signal_connect (GTK_OBJECT (options->supersample_w), "toggled",
(GtkSignalFunc) tool_options_toggle_update,
&options->supersample);
gtk_box_pack_start (GTK_BOX (vbox), options->supersample_w, FALSE, FALSE, 0);
gtk_widget_show (options->supersample_w);
/* table for supersampling options */
table = gtk_table_new (2, 2, FALSE);
gtk_container_set_border_width (GTK_CONTAINER (table), 2);
gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 1);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
/* automatically set the sensitive state of the table */
gtk_widget_set_sensitive (table, options->supersample_d);
gtk_object_set_data (GTK_OBJECT (options->supersample_w), "set_sensitive",
table);
/* max depth scale */
label = gtk_label_new (_("Max depth:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
options->max_depth_w =
gtk_adjustment_new (options->max_depth_d, 1.0, 10.0, 1.0, 1.0, 1.0);
gtk_signal_connect (GTK_OBJECT(options->max_depth_w), "value_changed",
(GtkSignalFunc) tool_options_int_adjustment_update,
&options->max_depth);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->max_depth_w));
gtk_scale_set_digits (GTK_SCALE (scale), 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, 0, 1);
gtk_widget_show (scale);
/* threshold scale */
label = gtk_label_new (_("Threshold:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
options->threshold_w =
gtk_adjustment_new (options->threshold_d, 0.0, 4.0, 0.01, 0.01, 0.0);
gtk_signal_connect (GTK_OBJECT(options->threshold_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->threshold);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->threshold_w));
gtk_scale_set_digits (GTK_SCALE (scale), 2);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, 1, 2);
gtk_widget_show (scale);
/* show the table */
gtk_widget_show (table);
return options;
}
static void
blend_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
BlendTool * blend_tool;
gdisp = (GDisplay *) gdisp_ptr;
blend_tool = (BlendTool *) tool->private;
switch (drawable_type (gimage_active_drawable (gdisp->gimage)))
{
case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
g_message (_("Blend: Invalid for indexed images."));
return;
break;
default:
break;
}
/* Keep the coordinates of the target */
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y,
&blend_tool->startx, &blend_tool->starty, FALSE, 1);
blend_tool->endx = blend_tool->startx;
blend_tool->endy = blend_tool->starty;
/* Make the tool active and set the gdisplay which owns it */
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->gdisp_ptr = gdisp_ptr;
tool->state = ACTIVE;
/* initialize the statusbar display */
blend_tool->context_id = gtk_statusbar_get_context_id (GTK_STATUSBAR (gdisp->statusbar), "blend");
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar), blend_tool->context_id, _("Blend: 0, 0"));
/* Start drawing the blend tool */
draw_core_start (blend_tool->core, gdisp->canvas->window, tool);
}
static void
blend_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
GImage * gimage;
BlendTool * blend_tool;
#ifdef BLEND_UI_CALLS_VIA_PDB
Argument *return_vals;
int nreturn_vals;
#else
gimp_progress *progress;
#endif
gdisp = (GDisplay *) gdisp_ptr;
gimage = gdisp->gimage;
blend_tool = (BlendTool *) tool->private;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), blend_tool->context_id);
draw_core_stop (blend_tool->core, tool);
tool->state = INACTIVE;
/* if the 3rd button isn't pressed, fill the selected region */
if (! (bevent->state & GDK_BUTTON3_MASK) &&
((blend_tool->startx != blend_tool->endx) ||
(blend_tool->starty != blend_tool->endy)))
{
/* we can't do callbacks easily with the PDB, so this UI/backend
* separation (though good) is ignored for the moment */
#ifdef BLEND_UI_CALLS_VIA_PDB
return_vals =
procedural_db_run_proc ("gimp_blend",
&nreturn_vals,
PDB_DRAWABLE, drawable_ID (gimage_active_drawable (gimage)),
PDB_INT32, (gint32) blend_options->blend_mode,
PDB_INT32, (gint32) PAINT_OPTIONS_GET_PAINT_MODE (blend_options),
PDB_INT32, (gint32) blend_options->gradient_type,
PDB_FLOAT, (gdouble) PAINT_OPTIONS_GET_OPACITY (blend_options) * 100,
PDB_FLOAT, (gdouble) blend_options->offset,
PDB_INT32, (gint32) blend_options->repeat,
PDB_INT32, (gint32) blend_options->supersample,
PDB_INT32, (gint32) blend_options->max_depth,
PDB_FLOAT, (gdouble) blend_options->threshold,
PDB_FLOAT, (gdouble) blend_tool->startx,
PDB_FLOAT, (gdouble) blend_tool->starty,
PDB_FLOAT, (gdouble) blend_tool->endx,
PDB_FLOAT, (gdouble) blend_tool->endy,
PDB_END);
if (return_vals && return_vals[0].value.pdb_int == PDB_SUCCESS)
gdisplays_flush ();
else
g_message (_("Blend operation failed."));
procedural_db_destroy_args (return_vals, nreturn_vals);
#else /* ! BLEND_UI_CALLS_VIA_PDB */
progress = progress_start (gdisp, _("Blending..."), FALSE, NULL, NULL);
blend (gimage,
gimage_active_drawable (gimage),
blend_options->blend_mode,
gimp_context_get_paint_mode (NULL),
blend_options->gradient_type,
gimp_context_get_opacity (NULL) * 100,
blend_options->offset,
blend_options->repeat,
blend_options->supersample,
blend_options->max_depth,
blend_options->threshold,
blend_tool->startx,
blend_tool->starty,
blend_tool->endx,
blend_tool->endy,
progress? progress_update_and_flush : NULL, progress);
if (progress)
progress_end (progress);
gdisplays_flush ();
#endif /* ! BLEND_UI_CALLS_VIA_PDB */
}
}
static void
blend_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
BlendTool * blend_tool;
gchar vector[STATUSBAR_SIZE];
gdisp = (GDisplay *) gdisp_ptr;
blend_tool = (BlendTool *) tool->private;
/* undraw the current tool */
draw_core_pause (blend_tool->core, tool);
/* Get the current coordinates */
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y,
&blend_tool->endx, &blend_tool->endy, FALSE, 1);
/* Restrict to multiples of 45 degrees if shift is pressed */
if (mevent->state & GDK_SHIFT_MASK) {
int dx, dy, d;
int abs_dx, abs_dy;
dx = blend_tool->endx - blend_tool->startx;
dy = blend_tool->endy - blend_tool->starty;
abs_dx = abs(dx);
abs_dy = abs(dy);
d = (abs_dx + abs_dy) >> 1;
if ((abs_dx >> 1) < abs_dy && (abs_dy >> 1) < abs_dx)
{
blend_tool->endx = blend_tool->startx + ((dx < 0) ? -d : d);
blend_tool->endy = blend_tool->starty + ((dy < 0) ? -d : d);
}
else
{
if (abs_dx > abs_dy)
blend_tool->endy = blend_tool->starty;
else
blend_tool->endx = blend_tool->startx;
}
}
/* restrict to horizontal/vertical blend, if modifiers are pressed */
if (mevent->state & GDK_MOD1_MASK)
{
if (mevent->state & GDK_CONTROL_MASK)
{
int dx, dy, d;
dx = blend_tool->endx - blend_tool->startx;
dy = blend_tool->endy - blend_tool->starty;
d = (abs(dx) + abs(dy)) >> 1;
blend_tool->endx = blend_tool->startx + ((dx < 0) ? -d : d);
blend_tool->endy = blend_tool->starty + ((dy < 0) ? -d : d);
}
else
blend_tool->endx = blend_tool->startx;
}
else if (mevent->state & GDK_CONTROL_MASK)
blend_tool->endy = blend_tool->starty;
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), blend_tool->context_id);
if (gdisp->dot_for_dot)
{
g_snprintf (vector, sizeof (vector), gdisp->cursor_format_str,
_("Blend: "),
blend_tool->endx - blend_tool->startx,
", ",
blend_tool->endy - blend_tool->starty);
}
else /* show real world units */
{
gdouble unit_factor = gimp_unit_get_factor (gdisp->gimage->unit);
g_snprintf (vector, sizeof (vector), gdisp->cursor_format_str,
_("Blend: "),
blend_tool->endx - blend_tool->startx * unit_factor /
gdisp->gimage->xresolution,
", ",
blend_tool->endy - blend_tool->starty * unit_factor /
gdisp->gimage->yresolution);
}
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar), blend_tool->context_id,
vector);
/* redraw the current tool */
draw_core_resume (blend_tool->core, tool);
}
static void
blend_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
gdisp = (GDisplay *) gdisp_ptr;
switch (drawable_type (gimage_active_drawable (gdisp->gimage)))
{
case INDEXED_GIMAGE:
case INDEXEDA_GIMAGE:
gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
break;
default:
gdisplay_install_tool_cursor (gdisp, GDK_TCROSS);
break;
}
}
static void
blend_draw (Tool *tool)
{
GDisplay * gdisp;
BlendTool * blend_tool;
int tx1, ty1, tx2, ty2;
gdisp = (GDisplay *) tool->gdisp_ptr;
blend_tool = (BlendTool *) tool->private;
gdisplay_transform_coords (gdisp, blend_tool->startx, blend_tool->starty,
&tx1, &ty1, 1);
gdisplay_transform_coords (gdisp, blend_tool->endx, blend_tool->endy,
&tx2, &ty2, 1);
/* Draw start target */
gdk_draw_line (blend_tool->core->win, blend_tool->core->gc,
tx1 - (TARGET_WIDTH >> 1), ty1,
tx1 + (TARGET_WIDTH >> 1), ty1);
gdk_draw_line (blend_tool->core->win, blend_tool->core->gc,
tx1, ty1 - (TARGET_HEIGHT >> 1),
tx1, ty1 + (TARGET_HEIGHT >> 1));
/* Draw end target */
gdk_draw_line (blend_tool->core->win, blend_tool->core->gc,
tx2 - (TARGET_WIDTH >> 1), ty2,
tx2 + (TARGET_WIDTH >> 1), ty2);
gdk_draw_line (blend_tool->core->win, blend_tool->core->gc,
tx2, ty2 - (TARGET_HEIGHT >> 1),
tx2, ty2 + (TARGET_HEIGHT >> 1));
/* Draw the line between the start and end coords */
gdk_draw_line (blend_tool->core->win, blend_tool->core->gc,
tx1, ty1, tx2, ty2);
}
static void
blend_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
BlendTool * blend_tool;
blend_tool = (BlendTool *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (blend_tool->core, tool);
break;
case RESUME:
draw_core_resume (blend_tool->core, tool);
break;
case HALT:
draw_core_stop (blend_tool->core, tool);
break;
default:
break;
}
}
/*****/
/* The actual blending procedure */
void
blend (GImage *gimage,
GimpDrawable *drawable,
BlendMode blend_mode,
int paint_mode,
GradientType gradient_type,
double opacity,
double offset,
RepeatMode repeat,
int supersample,
int max_depth,
double threshold,
double startx,
double starty,
double endx,
double endy,
progress_func_t progress_callback,
void *progress_data)
{
TileManager *buf_tiles;
PixelRegion bufPR;
int has_alpha;
int has_selection;
int bytes;
int x1, y1, x2, y2;
gimp_add_busy_cursors();
has_selection = drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
has_alpha = drawable_has_alpha (drawable);
bytes = drawable_bytes (drawable);
/* Always create an alpha temp buf (for generality) */
if (! has_alpha)
{
has_alpha = TRUE;
bytes += 1;
}
buf_tiles = tile_manager_new ((x2 - x1), (y2 - y1), bytes);
pixel_region_init (&bufPR, buf_tiles, 0, 0, (x2 - x1), (y2 - y1), TRUE);
gradient_fill_region (gimage, drawable,
&bufPR, (x2 - x1), (y2 - y1),
blend_mode, gradient_type, offset, repeat,
supersample, max_depth, threshold,
(startx - x1), (starty - y1),
(endx - x1), (endy - y1),
progress_callback, progress_data);
pixel_region_init (&bufPR, buf_tiles, 0, 0, (x2 - x1), (y2 - y1), FALSE);
gimage_apply_image (gimage, drawable, &bufPR, TRUE,
(opacity * 255) / 100, paint_mode, NULL, x1, y1);
/* update the image */
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
/* free the temporary buffer */
tile_manager_destroy (buf_tiles);
gimp_remove_busy_cursors(NULL);
}
static double
gradient_calc_conical_sym_factor (double dist,
double *axis,
double offset,
double x,
double y)
{
double vec[2];
double r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
if ((x != 0) || (y != 0))
{
/* 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) + 1);
rat = BOUNDS(rat, 0.0, 1.0);
}
else
rat = 0.5;
return rat;
} /* gradient_calc_conical_sym_factor */
/*****/
static double
gradient_calc_conical_asym_factor (double dist,
double *axis,
double offset,
double x,
double y)
{
double ang0, ang1;
double ang;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
if ((x != 0) || (y != 0))
{
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) + 1);
rat = BOUNDS(rat, 0.0, 1.0);
}
else
rat = 0.5; /* We are on middle point */
} /* else */
return rat;
} /* gradient_calc_conical_asym_factor */
/*****/
static double
gradient_calc_square_factor (double dist,
double offset,
double x,
double y)
{
double r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
/* Calculate offset from start as a value in [0, 1] */
offset = offset / 100.0;
r = MAXIMUM(abs(x), abs(y));
rat = r / dist;
if (rat < offset)
rat = 0.0;
else if (offset == 1)
rat = (rat>=1) ? 1 : 0;
else
rat = (rat - offset) / (1.0 - offset);
} /* else */
return rat;
} /* gradient_calc_square_factor */
/*****/
static double
gradient_calc_radial_factor (double dist,
double offset,
double x,
double y)
{
double r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
/* 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)
rat = 0.0;
else if (offset == 1)
rat = (rat>=1) ? 1 : 0;
else
rat = (rat - offset) / (1.0 - offset);
} /* else */
return rat;
} /* gradient_calc_radial_factor */
/*****/
static double
gradient_calc_linear_factor (double dist,
double *vec,
double x,
double y)
{
double r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
r = vec[0] * x + vec[1] * y;
rat = r / dist;
} /* else */
return rat;
} /* gradient_calc_linear_factor */
/*****/
static double
gradient_calc_bilinear_factor (double dist,
double *vec,
double offset,
double x,
double y)
{
double r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
/* 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)
rat = 0.0;
else if (offset == 1)
rat = (rat>=1) ? 1 : 0;
else
rat = (fabs(rat) - offset) / (1.0 - offset);
} /* else */
return rat;
} /* gradient_calc_bilinear_factor */
static double
gradient_calc_spiral_factor (double dist,
double *axis,
double offset,
double x,
double y,
gint cwise)
{
double ang0, ang1;
double ang, r;
double rat;
if (dist == 0.0)
rat = 0.0;
else
{
if (x != 0.0 || y != 0.0)
{
ang0 = atan2 (axis[0], axis[1]) + G_PI;
ang1 = atan2 (x, y) + G_PI;
if(!cwise)
ang = ang0 - ang1;
else
ang = ang1 - ang0;
if (ang < 0.0)
ang += (2.0 * G_PI);
r = sqrt (x * x + y * y) / dist;
rat = ang / (2.0 * G_PI) + r + offset;
rat = fmod (rat, 1.0);
}
else
rat = 0.5 ; /* We are on the middle point */
}
return rat;
}
static double
gradient_calc_shapeburst_angular_factor (double x,
double y)
{
int ix, iy;
Tile *tile;
float value;
ix = (int) BOUNDS (x, 0, distR.w);
iy = (int) BOUNDS (y, 0, distR.h);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = 1.0 - *((float *) tile_data_pointer (tile, ix % TILE_WIDTH, iy % TILE_HEIGHT));
tile_release (tile, FALSE);
return value;
}
static double
gradient_calc_shapeburst_spherical_factor (double x,
double y)
{
int ix, iy;
Tile *tile;
float value;
ix = (int) BOUNDS (x, 0, distR.w);
iy = (int) BOUNDS (y, 0, distR.h);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = *((float *) 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 double
gradient_calc_shapeburst_dimpled_factor (double x,
double y)
{
int ix, iy;
Tile *tile;
float value;
ix = (int) BOUNDS (x, 0, distR.w);
iy = (int) BOUNDS (y, 0, distR.h);
tile = tile_manager_get_tile (distR.tiles, ix, iy, TRUE, FALSE);
value = *((float *) tile_data_pointer (tile, ix % TILE_WIDTH, iy % TILE_HEIGHT));
value = cos (0.5 * G_PI * value);
tile_release (tile, FALSE);
return value;
}
static double
gradient_repeat_none (double val)
{
return BOUNDS(val, 0.0, 1.0);
}
static double
gradient_repeat_sawtooth (double val)
{
if (val >= 0.0)
return fmod(val, 1.0);
else
return 1.0 - fmod(-val, 1.0);
}
static double
gradient_repeat_triangular (double val)
{
int ival;
if (val < 0.0)
val = -val;
ival = (int) val;
if (ival & 1)
return 1.0 - fmod(val, 1.0);
else
return fmod(val, 1.0);
}
/*****/
static void
gradient_precalc_shapeburst (GImage *gimage,
GimpDrawable *drawable,
PixelRegion *PR,
double dist)
{
Channel *mask;
PixelRegion tempR;
float max_iteration;
float *distp;
int size;
void * pr;
unsigned char white[1] = { OPAQUE_OPACITY };
/* allocate the distance map */
if (distR.tiles)
tile_manager_destroy (distR.tiles);
distR.tiles = tile_manager_new (PR->w, PR->h, sizeof (float));
/* 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);
/* If the gimage mask is not empty, use it as the shape burst source */
if (! gimage_mask_is_empty (gimage))
{
PixelRegion maskR;
int x1, y1, x2, y2;
int offx, offy;
drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
drawable_offsets (drawable, &offx, &offy);
/* the selection mask */
mask = gimage_get_mask (gimage);
pixel_region_init (&maskR, 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 (drawable_has_alpha (drawable))
{
PixelRegion drawableR;
pixel_region_init (&drawableR, drawable_data (drawable), PR->x, PR->y, PR->w, PR->h, FALSE);
extract_alpha_region (&drawableR, NULL, &tempR);
}
/* Otherwise, just fill the shapeburst to white */
else
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);
/* 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 = (float *) 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_destroy (tempR.tiles);
}
static void
gradient_render_pixel (double x,
double y,
color_t *color,
void *render_data)
{
RenderBlendData *rbd;
double factor;
rbd = render_data;
/* Calculate blending factor */
switch (rbd->gradient_type)
{
case RADIAL:
factor = gradient_calc_radial_factor(rbd->dist, rbd->offset,
x - rbd->sx, y - rbd->sy);
break;
case CONICAL_SYMMETRIC:
factor = gradient_calc_conical_sym_factor(rbd->dist, rbd->vec, rbd->offset,
x - rbd->sx, y - rbd->sy);
break;
case CONICAL_ASYMMETRIC:
factor = gradient_calc_conical_asym_factor(rbd->dist, rbd->vec, rbd->offset,
x - rbd->sx, y - rbd->sy);
break;
case SQUARE:
factor = gradient_calc_square_factor(rbd->dist, rbd->offset,
x - rbd->sx, y - rbd->sy);
break;
case LINEAR:
factor = gradient_calc_linear_factor(rbd->dist, rbd->vec,
x - rbd->sx, y - rbd->sy);
break;
case BILINEAR:
factor = gradient_calc_bilinear_factor(rbd->dist, rbd->vec, rbd->offset,
x - rbd->sx, y - rbd->sy);
break;
case SHAPEBURST_ANGULAR:
factor = gradient_calc_shapeburst_angular_factor(x, y);
break;
case SHAPEBURST_SPHERICAL:
factor = gradient_calc_shapeburst_spherical_factor(x, y);
break;
case SHAPEBURST_DIMPLED:
factor = gradient_calc_shapeburst_dimpled_factor(x, y);
break;
case SPIRAL_CLOCKWISE:
factor = gradient_calc_spiral_factor (rbd->dist, rbd->vec, rbd->offset,
x - rbd->sx, y - rbd->sy,TRUE);
break;
case SPIRAL_ANTICLOCKWISE:
factor = gradient_calc_spiral_factor (rbd->dist, rbd->vec, rbd->offset,
x - rbd->sx, y - rbd->sy,FALSE);
break;
default:
gimp_fatal_error(_("gradient_render_pixel(): Unknown gradient type %d"),
(int) rbd->gradient_type);
return;
}
/* Adjust for repeat */
factor = (*rbd->repeat_func)(factor);
/* Blend the colors */
if (rbd->blend_mode == CUSTOM_MODE)
grad_get_color_at(factor, &color->r, &color->g, &color->b, &color->a);
else
{
/* Blend values */
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 == FG_BG_HSV_MODE)
calc_hsv_to_rgb(&color->r, &color->g, &color->b);
}
}
static void
gradient_put_pixel (int x,
int y,
color_t color,
void *put_pixel_data)
{
PutPixelData *ppd;
unsigned char *data;
ppd = put_pixel_data;
/* Paint */
data = ppd->row_data + ppd->bytes * x;
if (ppd->bytes >= 3)
{
*data++ = color.r * 255.0;
*data++ = color.g * 255.0;
*data++ = color.b * 255.0;
*data++ = color.a * 255.0;
}
else
{
/* Convert to grayscale */
*data++ = 255.0 * (0.30 * color.r +
0.59 * color.g +
0.11 * color.b);
*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 (GImage *gimage,
GimpDrawable *drawable,
PixelRegion *PR,
int width,
int height,
BlendMode blend_mode,
GradientType gradient_type,
double offset,
RepeatMode repeat,
int supersample,
int max_depth,
double threshold,
double sx,
double sy,
double ex,
double ey,
progress_func_t progress_callback,
void *progress_data)
{
RenderBlendData rbd;
PutPixelData ppd;
unsigned char r, g, b;
int x, y;
int endx, endy;
void *pr;
unsigned char *data;
color_t color;
/* Get foreground and background colors, normalized */
palette_get_foreground(&r, &g, &b);
rbd.fg.r = r / 255.0;
rbd.fg.g = g / 255.0;
rbd.fg.b = b / 255.0;
rbd.fg.a = 1.0; /* Foreground is always opaque */
palette_get_background(&r, &g, &b);
rbd.bg.r = r / 255.0;
rbd.bg.g = g / 255.0;
rbd.bg.b = b / 255.0;
rbd.bg.a = 1.0; /* opaque, for now */
switch (blend_mode)
{
case FG_BG_RGB_MODE:
break;
case FG_BG_HSV_MODE:
/* Convert to HSV */
calc_rgb_to_hsv(&rbd.fg.r, &rbd.fg.g, &rbd.fg.b);
calc_rgb_to_hsv(&rbd.bg.r, &rbd.bg.g, &rbd.bg.b);
break;
case FG_TRANS_MODE:
/* Color does not change, just the opacity */
rbd.bg = rbd.fg;
rbd.bg.a = 0.0; /* transparent */
break;
case CUSTOM_MODE:
break;
default:
gimp_fatal_error(_("gradient_fill_region(): Unknown blend mode %d"),
(int) blend_mode);
break;
}
/* Calculate type-specific parameters */
switch (gradient_type)
{
case RADIAL:
rbd.dist = sqrt(SQR(ex - sx) + SQR(ey - sy));
break;
case SQUARE:
rbd.dist = MAXIMUM(fabs(ex - sx), fabs(ey - sy));
break;
case CONICAL_SYMMETRIC:
case CONICAL_ASYMMETRIC:
case SPIRAL_CLOCKWISE:
case SPIRAL_ANTICLOCKWISE:
case LINEAR:
case 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 SHAPEBURST_ANGULAR:
case SHAPEBURST_SPHERICAL:
case SHAPEBURST_DIMPLED:
rbd.dist = sqrt(SQR(ex - sx) + SQR(ey - sy));
gradient_precalc_shapeburst(gimage, drawable, PR, rbd.dist);
break;
default:
gimp_fatal_error(_("gradient_fill_region(): Unknown gradient type %d"),
(int) gradient_type);
break;
}
/* Set repeat function */
switch (repeat)
{
case REPEAT_NONE:
rbd.repeat_func = gradient_repeat_none;
break;
case REPEAT_SAWTOOTH:
rbd.repeat_func = gradient_repeat_sawtooth;
break;
case REPEAT_TRIANGULAR:
rbd.repeat_func = gradient_repeat_triangular;
break;
default:
gimp_fatal_error(_("gradient_fill_region(): Unknown repeat mode %d"),
(int) repeat);
break;
}
/* Initialize render data */
rbd.offset = offset;
rbd.sx = sx;
rbd.sy = sy;
rbd.blend_mode = blend_mode;
rbd.gradient_type = gradient_type;
/* Render the gradient! */
if (supersample)
{
/* Initialize put pixel data */
ppd.PR = PR;
ppd.row_data = g_malloc(width * PR->bytes);
ppd.bytes = PR->bytes;
ppd.width = width;
/* Render! */
adaptive_supersample_area(0, 0, (width - 1), (height - 1),
max_depth, threshold,
gradient_render_pixel, &rbd,
gradient_put_pixel, &ppd,
progress_callback, progress_data);
/* Clean up */
g_free(ppd.row_data);
}
else
{
int max_progress = PR->w * PR->h;
int 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)
{
*data++ = color.r * 255.0;
*data++ = color.g * 255.0;
*data++ = color.b * 255.0;
*data++ = color.a * 255.0;
}
else
{
/* Convert to grayscale */
*data++ = 255.0 * (0.30 * color.r +
0.59 * color.g +
0.11 * color.b);
*data++ = color.a * 255.0;
}
}
progress += PR->w * PR->h;
if (progress_callback)
(*progress_callback) (0, max_progress, progress, progress_data);
}
}
}
static void
calc_rgb_to_hsv (double *r,
double *g,
double *b)
{
double red, green, blue;
double h, s, v;
double min, max;
double delta;
red = *r;
green = *g;
blue = *b;
h = 0.0; /* Shut up -Wall */
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
v = max;
if (max != 0.0)
s = (max - min) / max;
else
s = 0.0;
if (s == 0.0)
h = 0.0;
else
{
delta = max - min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h /= 6.0;
if (h < 0.0)
h += 1.0;
else if (h > 1.0)
h -= 1.0;
}
*r = h;
*g = s;
*b = v;
}
static void
calc_hsv_to_rgb (double *h,
double *s,
double *v)
{
double hue, saturation, value;
double f, p, q, t;
if (*s == 0.0)
{
*h = *v;
*s = *v;
*v = *v; /* heh */
}
else
{
hue = *h * 6.0;
saturation = *s;
value = *v;
if (hue == 6.0)
hue = 0.0;
f = hue - (int) hue;
p = value * (1.0 - saturation);
q = value * (1.0 - saturation * f);
t = value * (1.0 - saturation * (1.0 - f));
switch ((int) hue)
{
case 0:
*h = value;
*s = t;
*v = p;
break;
case 1:
*h = q;
*s = value;
*v = p;
break;
case 2:
*h = p;
*s = value;
*v = t;
break;
case 3:
*h = p;
*s = q;
*v = value;
break;
case 4:
*h = t;
*s = p;
*v = value;
break;
case 5:
*h = value;
*s = p;
*v = q;
break;
}
}
}
/****************************/
/* Global blend functions */
/****************************/
Tool *
tools_new_blend ()
{
Tool * tool;
BlendTool * private;
/* The tool options */
if (! blend_options)
{
blend_options = blend_options_new ();
tools_register (BLEND, (ToolOptions *) blend_options);
}
tool = tools_new_tool (BLEND);
private = g_new (BlendTool, 1);
private->core = draw_core_new (blend_draw);
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->private = (void *) private;
tool->button_press_func = blend_button_press;
tool->button_release_func = blend_button_release;
tool->motion_func = blend_motion;
tool->cursor_update_func = blend_cursor_update;
tool->control_func = blend_control;
return tool;
}
void
tools_free_blend (Tool *tool)
{
BlendTool * blend_tool;
blend_tool = (BlendTool *) tool->private;
if (tool->state == ACTIVE)
draw_core_stop (blend_tool->core, tool);
draw_core_free (blend_tool->core);
/* free the distance map data if it exists */
if (distR.tiles)
tile_manager_destroy (distR.tiles);
distR.tiles = NULL;
g_free (blend_tool);
}
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