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gimp/app/paint/gimperaser.c
Michael Natterer 6ed7523052 use GimpCoords structs for cur_coords, last_coords and start_coords and 
2001-11-13  Michael Natterer  <mitch@gimp.org>

	* app/tools/gimppainttool.[ch]: use GimpCoords structs for
	cur_coords, last_coords and start_coords and the undo struct
	instead of storing separate gdouble values.

	* app/undo.c
	* app/tools/gimpairbrushtool.c
	* app/tools/gimpclonetool.c
	* app/tools/gimpconvolvetool.c
	* app/tools/gimpdodgeburntool.c
	* app/tools/gimperasertool.c
	* app/tools/gimppaintbrushtool.c
	* app/tools/gimppenciltool.c
	* app/tools/gimpsmudgetool.c: changed accordingly.
2001-11-13 16:21:34 +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 <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpcontext.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "gimperasertool.h"
#include "paint_options.h"
#include "tool_manager.h"
#include "libgimp/gimpintl.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpcolor/gimprgb.h"
#define ERASER_DEFAULT_HARD FALSE
#define ERASER_DEFAULT_INCREMENTAL FALSE
#define ERASER_DEFAULT_ANTI_ERASE FALSE
#define ERASER_DEFAULT_COLOR_ERASE FALSE
typedef struct _EraserOptions EraserOptions;
struct _EraserOptions
{
PaintOptions paint_options;
gboolean hard;
gboolean hard_d;
GtkWidget *hard_w;
gboolean anti_erase;
gboolean anti_erase_d;
GtkWidget *anti_erase_w;
gboolean color_erase;
gboolean color_erase_d;
GtkWidget *color_erase_w;
};
static void gimp_eraser_tool_class_init (GimpEraserToolClass *klass);
static void gimp_eraser_tool_init (GimpEraserTool *eraser);
static void gimp_eraser_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_eraser_tool_paint (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintState state);
static void gimp_eraser_tool_motion (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
gboolean hard,
gboolean incremental,
gboolean anti_erase,
gboolean color_erase);
static EraserOptions * gimp_eraser_tool_options_new (void);
static void gimp_eraser_tool_options_reset (GimpToolOptions *tool_options);
static void gimp_eraser_tool_colortoalpha (GimpRGB *src,
const GimpRGB *color);
/* local variables */
static gboolean non_gui_hard = ERASER_DEFAULT_HARD;
static gboolean non_gui_incremental = ERASER_DEFAULT_INCREMENTAL;
static gboolean non_gui_anti_erase = ERASER_DEFAULT_ANTI_ERASE;
static gboolean non_gui_color_erase = ERASER_DEFAULT_COLOR_ERASE;
static EraserOptions *eraser_options = NULL;
static GimpPaintToolClass *parent_class = NULL;
/* functions */
void
gimp_eraser_tool_register (Gimp *gimp)
{
tool_manager_register_tool (gimp,
GIMP_TYPE_ERASER_TOOL,
TRUE,
"gimp:eraser_tool",
_("Eraser"),
_("Paint fuzzy brush strokes"),
N_("/Tools/Paint Tools/Eraser"), "<shift>E",
NULL, "tools/eraser.html",
GIMP_STOCK_TOOL_ERASER);
}
GType
gimp_eraser_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpEraserToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_eraser_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpEraserTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_eraser_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_PAINT_TOOL,
"GimpEraserTool",
&tool_info, 0);
}
return tool_type;
}
static void
gimp_eraser_tool_class_init (GimpEraserToolClass *klass)
{
GimpToolClass *tool_class;
GimpPaintToolClass *paint_tool_class;
tool_class = GIMP_TOOL_CLASS (klass);
paint_tool_class = GIMP_PAINT_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
tool_class->modifier_key = gimp_eraser_tool_modifier_key;
paint_tool_class->paint = gimp_eraser_tool_paint;
}
static void
gimp_eraser_tool_init (GimpEraserTool *eraser)
{
GimpTool *tool;
GimpPaintTool *paint_tool;
tool = GIMP_TOOL (eraser);
paint_tool = GIMP_PAINT_TOOL (eraser);
if (! eraser_options)
{
eraser_options = gimp_eraser_tool_options_new ();
tool_manager_register_tool_options (GIMP_TYPE_ERASER_TOOL,
(GimpToolOptions *) eraser_options);
}
tool->tool_cursor = GIMP_ERASER_TOOL_CURSOR;
paint_tool->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
}
static void
gimp_eraser_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *gdisp)
{
if ((key == GDK_CONTROL_MASK) &&
! (state & GDK_SHIFT_MASK)) /* leave stuff untouched in line draw mode */
{
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (eraser_options->anti_erase_w),
! eraser_options->anti_erase);
}
tool->toggled = eraser_options->anti_erase;
}
static void
gimp_eraser_tool_paint (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintState state)
{
PaintPressureOptions *pressure_options;
gboolean hard;
gboolean incremental;
gboolean anti_erase;
gboolean color_erase;
if (eraser_options)
{
pressure_options = eraser_options->paint_options.pressure_options;
hard = eraser_options->hard;
incremental = eraser_options->paint_options.incremental;
anti_erase = eraser_options->anti_erase;
color_erase = eraser_options->color_erase;
}
else
{
pressure_options = &non_gui_pressure_options;
hard = non_gui_hard;
incremental = non_gui_incremental;
anti_erase = non_gui_anti_erase;
color_erase = non_gui_color_erase;
}
switch (state)
{
case INIT_PAINT:
break;
case MOTION_PAINT:
gimp_eraser_tool_motion (paint_tool,
drawable,
pressure_options,
hard,
incremental,
anti_erase,
color_erase);
break;
case FINISH_PAINT:
break;
default:
break;
}
}
static void
gimp_eraser_tool_motion (GimpPaintTool *paint_tool,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
gboolean hard,
gboolean incremental,
gboolean anti_erase,
gboolean color_erase)
{
GimpImage *gimage;
GimpContext *context;
gint opacity;
TempBuf *area;
guchar col[MAX_CHANNELS];
gdouble scale;
TempBuf *orig;
gint x, y, x1, y1, x2, y2;
PixelRegion srcPR, destPR;
gpointer pr;
GimpRGB bgcolor, color;
guchar *s, *d;
if (! (gimage = gimp_drawable_gimage (drawable)))
return;
gimp_image_get_background (gimage, drawable, col);
context = gimp_get_current_context (gimage->gimp);
if (pressure_options->size)
scale = paint_tool->cur_coords.pressure;
else
scale = 1.0;
/* Get a region which can be used to paint to */
if (! (area = gimp_paint_tool_get_paint_area (paint_tool, drawable, scale)))
return;
if (anti_erase || !color_erase)
{
/* set the alpha channel */
col[area->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
opacity = 255 * gimp_context_get_opacity (context);
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_tool->cur_coords.pressure;
/* paste the newly painted canvas to the gimage which is being
* worked on */
gimp_paint_tool_paste_canvas (paint_tool, drawable,
MIN (opacity, 255),
gimp_context_get_opacity (context) * 255,
anti_erase ? (color_erase ? BEHIND_MODE : ANTI_ERASE_MODE ) : ERASE_MODE,
hard ? HARD : (pressure_options->pressure ? PRESSURE : SOFT),
scale,
incremental ? INCREMENTAL : CONSTANT);
}
else
{
/* This is Simons evil Eraser Hack. Code is borrowed from the
* colortoalpha plugin by Seth Burgess. Algorithm has been
* described on IRC by clahey.
*/
gimp_rgb_set_uchar (&bgcolor, col[0], col[1], col[2]);
if (!gimp_drawable_has_alpha (drawable))
return;
/* is this necessary? */
x1 = CLAMP (area->x, 0, gimp_drawable_width (drawable));
y1 = CLAMP (area->y, 0, gimp_drawable_height (drawable));
x2 = CLAMP (area->x + area->width,
0, gimp_drawable_width (drawable));
y2 = CLAMP (area->y + area->height,
0, gimp_drawable_height (drawable));
if (!(x2 - x1) || !(y2 - y1))
return;
/* get the original image */
orig = gimp_paint_tool_get_orig_image (paint_tool, drawable, x1, y1, x2, y2);
srcPR.bytes = orig->bytes;
srcPR.x = 0; srcPR.y = 0;
srcPR.w = x2 - x1;
srcPR.h = y2 - y1;
srcPR.rowstride = srcPR.bytes * orig->width;
srcPR.data = temp_buf_data (orig);
/* configure the destination */
destPR.bytes = area->bytes;
destPR.x = 0; destPR.y = 0;
destPR.w = srcPR.w;
destPR.h = srcPR.h;
destPR.rowstride = destPR.bytes * area->width;
destPR.data = temp_buf_data (area);
/* I am not sure, if this really is necessary.
* Probably the orig Tempbuf has the same size as the area Tempbuf */
pr = pixel_regions_register (2, &srcPR, &destPR);
for (; pr != NULL; pr = pixel_regions_process (pr))
{
s = srcPR.data;
d = destPR.data;
for (y = 0; y < destPR.h; y++)
{
for (x = 0; x < destPR.w; x++)
{
gimp_rgba_set_uchar (&color,
s[x*srcPR.bytes ],
s[x*srcPR.bytes + 1],
s[x*srcPR.bytes + 2],
s[x*srcPR.bytes + 3]);
gimp_eraser_tool_colortoalpha (&color, &bgcolor);
gimp_rgba_get_uchar (&color,
&(d[x*destPR.bytes ]),
&(d[x*destPR.bytes + 1]),
&(d[x*destPR.bytes + 2]),
&(d[x*destPR.bytes + 3]));
}
s += srcPR.rowstride;
d += destPR.rowstride;
}
}
opacity = 255 * gimp_context_get_opacity (context);
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_tool->cur_coords.pressure;
/* paste the newly painted canvas to the gimage which is
* being worked on */
gimp_paint_tool_replace_canvas (paint_tool, drawable,
MIN (opacity, 255),
gimp_context_get_opacity (context) * 255,
hard ? HARD : (pressure_options->pressure ? PRESSURE : SOFT),
scale,
incremental ? INCREMENTAL : CONSTANT);
}
}
/* non-gui stuff */
gboolean
eraser_non_gui_default (GimpDrawable *drawable,
gint num_strokes,
gdouble *stroke_array)
{
gboolean hard = ERASER_DEFAULT_HARD;
gboolean incremental = ERASER_DEFAULT_INCREMENTAL;
gboolean anti_erase = ERASER_DEFAULT_ANTI_ERASE;
gboolean color_erase = ERASER_DEFAULT_COLOR_ERASE;
EraserOptions *options = eraser_options;
if (options)
{
hard = options->hard;
incremental = options->paint_options.incremental;
anti_erase = options->anti_erase;
color_erase = options->color_erase;
}
return eraser_non_gui (drawable, num_strokes, stroke_array,
hard, incremental, anti_erase, color_erase);
}
gboolean
eraser_non_gui (GimpDrawable *drawable,
gint num_strokes,
gdouble *stroke_array,
gint hard,
gint incremental,
gboolean anti_erase,
gboolean color_erase)
{
static GimpEraserTool *non_gui_eraser = NULL;
GimpPaintTool *paint_tool;
gint i;
if (! non_gui_eraser)
{
non_gui_eraser = g_object_new (GIMP_TYPE_ERASER_TOOL, NULL);
}
paint_tool = GIMP_PAINT_TOOL (non_gui_eraser);
if (gimp_paint_tool_start (paint_tool, drawable,
stroke_array[0],
stroke_array[1]))
{
non_gui_hard = hard;
non_gui_incremental = incremental;
non_gui_anti_erase = anti_erase;
non_gui_color_erase = color_erase;
paint_tool->start_coords.x = paint_tool->last_coords.x = stroke_array[0];
paint_tool->start_coords.y = paint_tool->last_coords.y = stroke_array[1];
gimp_paint_tool_paint (paint_tool, drawable, MOTION_PAINT);
for (i = 1; i < num_strokes; i++)
{
paint_tool->cur_coords.x = stroke_array[i * 2 + 0];
paint_tool->cur_coords.y = stroke_array[i * 2 + 1];
gimp_paint_tool_interpolate (paint_tool, drawable);
paint_tool->last_coords.x = paint_tool->cur_coords.x;
paint_tool->last_coords.y = paint_tool->cur_coords.y;
}
gimp_paint_tool_finish (paint_tool, drawable);
return TRUE;
}
return FALSE;
}
/* tool options stuff */
static EraserOptions *
gimp_eraser_tool_options_new (void)
{
EraserOptions *options;
GtkWidget *vbox;
options = g_new0 (EraserOptions, 1);
paint_options_init ((PaintOptions *) options,
GIMP_TYPE_ERASER_TOOL,
gimp_eraser_tool_options_reset);
options->hard = options->hard_d = ERASER_DEFAULT_HARD;
options->anti_erase = options->anti_erase_d = ERASER_DEFAULT_ANTI_ERASE;
options->color_erase = options->color_erase_d = ERASER_DEFAULT_COLOR_ERASE;
/* the main vbox */
vbox = ((GimpToolOptions *) options)->main_vbox;
/* the hard toggle */
options->hard_w = gtk_check_button_new_with_label (_("Hard Edge"));
gtk_box_pack_start (GTK_BOX (vbox), options->hard_w, FALSE, FALSE, 0);
g_signal_connect (G_OBJECT (options->hard_w), "toggled",
G_CALLBACK (gimp_toggle_button_update),
&options->hard);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->hard_w),
options->hard_d);
gtk_widget_show (options->hard_w);
/* the anti_erase toggle */
options->anti_erase_w = gtk_check_button_new_with_label (_("Anti Erase"));
gtk_box_pack_start (GTK_BOX (vbox), options->anti_erase_w, FALSE, FALSE, 0);
g_signal_connect (G_OBJECT (options->anti_erase_w), "toggled",
G_CALLBACK (gimp_toggle_button_update),
&options->anti_erase);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->anti_erase_w),
options->anti_erase_d);
gtk_widget_show (options->anti_erase_w);
/* the color_erase toggle */
options->color_erase_w = gtk_check_button_new_with_label (_("Color Erase"));
gtk_box_pack_start (GTK_BOX (vbox), options->color_erase_w, FALSE, FALSE, 0);
g_signal_connect (G_OBJECT (options->color_erase_w), "toggled",
G_CALLBACK (gimp_toggle_button_update),
&options->color_erase);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->color_erase_w),
options->color_erase_d);
gtk_widget_show (options->color_erase_w);
return options;
}
static void
gimp_eraser_tool_options_reset (GimpToolOptions *tool_options)
{
EraserOptions *options;
options = (EraserOptions *) tool_options;
paint_options_reset (tool_options);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->hard_w),
options->hard_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->anti_erase_w),
options->anti_erase_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->color_erase_w),
options->color_erase_d);
}
static void
gimp_eraser_tool_colortoalpha (GimpRGB *src,
const GimpRGB *color)
{
GimpRGB alpha;
alpha.a = src->a;
if (color->r < 0.0001)
alpha.r = src->r;
else if ( src->r > color->r )
alpha.r = (src->r - color->r) / (1.0 - color->r);
else if (src->r < color->r)
alpha.r = (color->r - src->r) / color->r;
else alpha.r = 0.0;
if (color->g < 0.0001)
alpha.g = src->g;
else if ( src->g > color->g )
alpha.g = (src->g - color->g) / (1.0 - color->g);
else if ( src->g < color->g )
alpha.g = (color->g - src->g) / (color->g);
else alpha.g = 0.0;
if (color->b < 0.0001)
alpha.b = src->b;
else if ( src->b > color->b )
alpha.b = (src->b - color->b) / (1.0 - color->b);
else if ( src->b < color->b )
alpha.b = (color->b - src->b) / (color->b);
else alpha.b = 0.0;
if ( alpha.r > alpha.g )
{
if ( alpha.r > alpha.b )
{
src->a = alpha.r;
}
else
{
src->a = alpha.b;
}
}
else if ( alpha.g > alpha.b )
{
src->a = alpha.g;
}
else
{
src->a = alpha.b;
}
if (src->a < 0.0001)
return;
src->r = (src->r - color->r) / src->a + color->r;
src->g = (src->g - color->g) / src->a + color->g;
src->b = (src->b - color->b) / src->a + color->b;
src->a *= alpha.a;
}
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