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gimp/app/paint/gimppaintbrush.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 <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpcontext.h"
#include "core/gimpdrawable.h"
#include "core/gimpgradient.h"
#include "core/gimpimage.h"
#include "gdisplay.h"
#include "gimppaintbrushtool.h"
#include "paint_options.h"
#include "tool_manager.h"
#include "libgimp/gimpintl.h"
#define WANT_PAINT_BRUSH_BITS
#include "icons.h"
#define PAINT_LEFT_THRESHOLD 0.05
#define PAINTBRUSH_DEFAULT_INCREMENTAL FALSE
static void gimp_paintbrush_tool_class_init (GimpPaintbrushToolClass *klass);
static void gimp_paintbrush_tool_init (GimpPaintbrushTool *tool);
static void gimp_paintbrush_tool_paint (GimpPaintTool *paint_core,
GimpDrawable *drawable,
PaintState state);
static void gimp_paintbrush_tool_motion (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
PaintGradientOptions *gradient_options,
gdouble fade_out,
gdouble gradient_length,
gboolean incremental,
GradientPaintMode gradient_type);
/* local variables */
static gboolean non_gui_incremental = PAINTBRUSH_DEFAULT_INCREMENTAL;
static PaintOptions *paintbrush_options = NULL;
static GimpPaintToolClass *parent_class = NULL;
/* functions */
void
gimp_paintbrush_tool_register (Gimp *gimp)
{
tool_manager_register_tool (gimp,
GIMP_TYPE_PAINTBRUSH_TOOL,
TRUE,
"gimp:paintbrush_tool",
_("Paintbrush"),
_("Paint fuzzy brush strokes"),
N_("/Tools/Paint Tools/Paintbrush"), "P",
NULL, "tools/paintbrush.html",
(const gchar **) paint_brush_bits);
}
GtkType
gimp_paintbrush_tool_get_type (void)
{
static GtkType tool_type = 0;
if (! tool_type)
{
GtkTypeInfo tool_info =
{
"GimpPaintbrushTool",
sizeof (GimpPaintbrushTool),
sizeof (GimpPaintbrushToolClass),
(GtkClassInitFunc) gimp_paintbrush_tool_class_init,
(GtkObjectInitFunc) gimp_paintbrush_tool_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
NULL
};
tool_type = gtk_type_unique (GIMP_TYPE_PAINT_TOOL, &tool_info);
}
return tool_type;
}
static void
gimp_paintbrush_tool_class_init (GimpPaintbrushToolClass *klass)
{
GimpPaintToolClass *paint_tool_class;
paint_tool_class = (GimpPaintToolClass *) klass;
parent_class = gtk_type_class (GIMP_TYPE_PAINT_TOOL);
paint_tool_class->paint = gimp_paintbrush_tool_paint;
}
static void
gimp_paintbrush_tool_init (GimpPaintbrushTool *paintbrush)
{
GimpTool *tool;
GimpPaintTool *paint_tool;
tool = GIMP_TOOL (paintbrush);
paint_tool = GIMP_PAINT_TOOL (paintbrush);
if (! paintbrush_options)
{
paintbrush_options = paint_options_new (GIMP_TYPE_PAINTBRUSH_TOOL,
paint_options_reset);
tool_manager_register_tool_options (GIMP_TYPE_PAINTBRUSH_TOOL,
(GimpToolOptions *) paintbrush_options);
}
tool->tool_cursor = GIMP_PAINTBRUSH_TOOL_CURSOR;
paint_tool->pick_colors = TRUE;
paint_tool->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
}
static void
gimp_paintbrush_tool_paint (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintState state)
{
PaintPressureOptions *pressure_options;
PaintGradientOptions *gradient_options;
gboolean incremental;
GimpImage *gimage;
gdouble fade_out;
gdouble gradient_length;
gdouble unit_factor;
gimage = gimp_drawable_gimage (drawable);
g_return_if_fail (gimage != NULL);
if (! gimage)
return;
if (paintbrush_options)
{
pressure_options = paintbrush_options->pressure_options;
gradient_options = paintbrush_options->gradient_options;
incremental = paintbrush_options->incremental;
}
else
{
pressure_options = &non_gui_pressure_options;
gradient_options = &non_gui_gradient_options;
incremental = non_gui_incremental;
}
switch (state)
{
case INIT_PAINT:
break;
case MOTION_PAINT:
switch (gradient_options->fade_unit)
{
case GIMP_UNIT_PIXEL:
fade_out = gradient_options->fade_out;
break;
case GIMP_UNIT_PERCENT:
fade_out = (MAX (gimage->width, gimage->height) *
gradient_options->fade_out / 100);
break;
default:
unit_factor = gimp_unit_get_factor (gradient_options->fade_unit);
fade_out = (gradient_options->fade_out *
MAX (gimage->xresolution,
gimage->yresolution) / unit_factor);
break;
}
switch (gradient_options->gradient_unit)
{
case GIMP_UNIT_PIXEL:
gradient_length = gradient_options->gradient_length;
break;
case GIMP_UNIT_PERCENT:
gradient_length = (MAX (gimage->width, gimage->height) *
gradient_options->gradient_length / 100);
break;
default:
unit_factor = gimp_unit_get_factor (gradient_options->gradient_unit);
gradient_length = (gradient_options->gradient_length *
MAX (gimage->xresolution,
gimage->yresolution) / unit_factor);
break;
}
gimp_paintbrush_tool_motion (paint_tool, drawable,
pressure_options,
gradient_options,
gradient_options->use_fade ? fade_out : 0,
gradient_options->use_gradient ? gradient_length : 0,
incremental,
gradient_options->gradient_type);
break;
case FINISH_PAINT:
break;
default:
break;
}
}
static void
gimp_paintbrush_tool_motion (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
PaintGradientOptions *gradient_options,
gdouble fade_out,
gdouble gradient_length,
gboolean incremental,
GradientPaintMode gradient_type)
{
GimpImage *gimage;
GimpContext *context;
TempBuf *area;
gdouble x, paint_left;
guchar local_blend = OPAQUE_OPACITY;
guchar temp_blend = OPAQUE_OPACITY;
guchar col[MAX_CHANNELS];
GimpRGB color;
gint mode;
gint opacity;
gdouble scale;
PaintApplicationMode paint_appl_mode = incremental ? INCREMENTAL : CONSTANT;
if (! (gimage = gimp_drawable_gimage (drawable)))
return;
context = gimp_get_current_context (gimage->gimp);
if (pressure_options->size)
scale = paint_tool->curpressure;
else
scale = 1.0;
if (pressure_options->color)
gradient_length = 1.0; /* not really used, only for if cases */
/* Get a region which can be used to paint to */
if (! (area = gimp_paint_tool_get_paint_area (paint_tool, drawable, scale)))
return;
/* factor in the fade out value */
if (fade_out)
{
/* Model the amount of paint left as a gaussian curve */
x = ((double) paint_tool->pixel_dist / fade_out);
paint_left = exp (- x * x * 5.541); /* ln (1/255) */
local_blend = (int) (255 * paint_left);
}
if (local_blend)
{
/* set the alpha channel */
temp_blend = local_blend;
mode = gradient_type;
if (gradient_length)
{
if (pressure_options->color)
gimp_gradient_get_color_at (gimp_context_get_gradient (context),
paint_tool->curpressure, &color);
else
gimp_paint_tool_get_color_from_gradient (paint_tool, gradient_length,
&color, mode);
temp_blend = (gint) ((color.a * local_blend));
gimp_rgb_get_uchar (&color,
&col[RED_PIX],
&col[GREEN_PIX],
&col[BLUE_PIX]);
col[ALPHA_PIX] = OPAQUE_OPACITY;
/* always use incremental mode with gradients */
/* make the gui cool later */
paint_appl_mode = INCREMENTAL;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
/* we check to see if this is a pixmap, if so composite the
* pixmap image into the area instead of the color
*/
else if (paint_tool->brush && paint_tool->brush->pixmap)
{
gimp_paint_tool_color_area_with_pixmap (paint_tool, gimage, drawable,
area,
scale, SOFT);
paint_appl_mode = INCREMENTAL;
}
else
{
gimp_image_get_foreground (gimage, drawable, col);
col[area->bytes - 1] = OPAQUE_OPACITY;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
opacity = (gdouble) temp_blend;
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_tool->curpressure;
gimp_paint_tool_paste_canvas (paint_tool, drawable,
MIN (opacity, 255),
gimp_context_get_opacity (context) * 255,
gimp_context_get_paint_mode (context),
pressure_options->pressure ? PRESSURE : SOFT,
scale, paint_appl_mode);
}
}
/* non-gui stuff */
static GimpPaintbrushTool *non_gui_paintbrush = NULL;
gboolean
gimp_paintbrush_tool_non_gui_default (GimpDrawable *drawable,
gint num_strokes,
gdouble *stroke_array)
{
GimpPaintTool *paint_tool;
gint i;
if (! non_gui_paintbrush)
{
non_gui_paintbrush = gtk_type_new (GIMP_TYPE_PAINTBRUSH_TOOL);
}
paint_tool = GIMP_PAINT_TOOL (non_gui_paintbrush);
/* Hmmm... PDB paintbrush should have gradient type added to it!
* thats why the code below is duplicated.
*/
if (gimp_paint_tool_start (paint_tool, drawable,
stroke_array[0],
stroke_array[1]))
{
paint_tool->startx = paint_tool->lastx = stroke_array[0];
paint_tool->starty = paint_tool->lasty = stroke_array[1];
gimp_paint_tool_paint (paint_tool, drawable, MOTION_PAINT);
for (i = 1; i < num_strokes; i++)
{
paint_tool->curx = stroke_array[i * 2 + 0];
paint_tool->cury = stroke_array[i * 2 + 1];
gimp_paint_tool_interpolate (paint_tool, drawable);
paint_tool->lastx = paint_tool->curx;
paint_tool->lasty = paint_tool->cury;
}
gimp_paint_tool_finish (paint_tool, drawable);
return TRUE;
}
return FALSE;
}
gboolean
gimp_paintbrush_tool_non_gui (GimpDrawable *drawable,
gint num_strokes,
gdouble *stroke_array,
gdouble fade_out,
gint method,
gdouble gradient_length)
{
GimpPaintTool *paint_tool;
gint i;
if (! non_gui_paintbrush)
{
non_gui_paintbrush = gtk_type_new (GIMP_TYPE_PAINTBRUSH_TOOL);
}
paint_tool = GIMP_PAINT_TOOL (non_gui_paintbrush);
/* Code duplicated above */
if (gimp_paint_tool_start (paint_tool, drawable,
stroke_array[0],
stroke_array[1]))
{
non_gui_gradient_options.fade_out = fade_out;
non_gui_gradient_options.gradient_length = gradient_length;
non_gui_gradient_options.gradient_type = LOOP_TRIANGLE;
non_gui_incremental = method;
paint_tool->startx = paint_tool->lastx = stroke_array[0];
paint_tool->starty = paint_tool->lasty = stroke_array[1];
gimp_paint_tool_paint (paint_tool, drawable, MOTION_PAINT);
for (i = 1; i < num_strokes; i++)
{
paint_tool->curx = stroke_array[i * 2 + 0];
paint_tool->cury = stroke_array[i * 2 + 1];
gimp_paint_tool_interpolate (paint_tool, drawable);
paint_tool->lastx = paint_tool->curx;
paint_tool->lasty = paint_tool->cury;
}
gimp_paint_tool_finish (paint_tool, drawable);
return TRUE;
}
return FALSE;
}
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