mirror of https://github.com/GNOME/gimp.git
274 lines
6.8 KiB
C
274 lines
6.8 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include "appenv.h"
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#include "drawable.h"
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#include "errors.h"
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#include "gdisplay.h"
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#include "gimpbrushpipe.h"
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#include "paint_funcs.h"
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#include "paint_core.h"
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#include "paint_options.h"
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#include "paintbrush.h"
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#include "palette.h"
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#include "pencil.h"
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#include "selection.h"
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#include "tool_options_ui.h"
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#include "tools.h"
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#include "libgimp/gimpintl.h"
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/* the pencil tool options */
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typedef struct _PencilOptions PencilOptions;
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struct _PencilOptions
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{
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PaintOptions paint_options;
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int use_pressure;
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int use_pressure_d;
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GtkWidget *use_pressure_w;
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};
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static PencilOptions *pencil_options = NULL;
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/* forward function declarations */
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static void pencil_motion (PaintCore *, GimpDrawable *, gboolean, gboolean);
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static gboolean non_gui_incremental = FALSE;
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static gboolean non_gui_pressure = TRUE;
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static void pencil_options_reset (void);
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#define PENCIL_INCREMENTAL_DEFAULT FALSE
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/* functions */
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void *
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pencil_paint_func (PaintCore *paint_core,
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GimpDrawable *drawable,
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int state)
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{
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switch (state)
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{
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case INIT_PAINT :
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break;
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case MOTION_PAINT :
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pencil_motion (paint_core, drawable, pencil_options->paint_options.incremental,
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pencil_options->use_pressure);
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break;
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case FINISH_PAINT :
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break;
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default :
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break;
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}
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return NULL;
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}
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static void
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pencil_pressure_toggle_callback (GtkWidget *widget,
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gpointer data)
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{
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tool_options_toggle_update (widget, data);
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}
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static PencilOptions *
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pencil_options_new (void)
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{
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PencilOptions *options;
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GtkWidget *vbox;
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options = (PencilOptions *) g_malloc (sizeof (PencilOptions));
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paint_options_init ((PaintOptions *) options,
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PENCIL,
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pencil_options_reset);
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options->use_pressure =
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options->use_pressure_d = TRUE;
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vbox = ((ToolOptions *) options)->main_vbox;
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options->use_pressure_w =
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gtk_check_button_new_with_label (_("Use Pressure"));
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gtk_box_pack_start (GTK_BOX (vbox), options->use_pressure_w, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (options->use_pressure_w), "toggled",
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(GtkSignalFunc) pencil_pressure_toggle_callback,
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&options->use_pressure);
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gtk_widget_show (options->use_pressure_w);
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return options;
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}
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static void
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pencil_options_reset (void)
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{
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PencilOptions *options = pencil_options;
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paint_options_reset ((PaintOptions *) pencil_options);
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->use_pressure_w),
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options->use_pressure_d);
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}
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Tool *
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tools_new_pencil (void)
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{
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Tool * tool;
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PaintCore * private;
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/* The tool options */
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if (!pencil_options)
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{
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pencil_options = pencil_options_new ();
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tools_register (PENCIL, (ToolOptions *) pencil_options);
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pencil_options_reset();
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}
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tool = paint_core_new (PENCIL);
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private = (PaintCore *) tool->private;
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private->paint_func = pencil_paint_func;
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private->pick_colors = TRUE;
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private->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
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return tool;
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}
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void
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tools_free_pencil (Tool *tool)
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{
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paint_core_free (tool);
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}
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static void
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pencil_motion (PaintCore *paint_core,
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GimpDrawable *drawable,
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gboolean increment,
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gboolean pressure)
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{
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GImage *gimage;
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TempBuf * area;
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unsigned char col[MAX_CHANNELS];
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gint opacity;
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PaintApplicationMode paint_appl_mode = increment ? INCREMENTAL : CONSTANT;
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if (! (gimage = drawable_gimage (drawable)))
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return;
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/* Get a region which can be used to paint to */
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if (! (area = paint_core_get_paint_area (paint_core, drawable)))
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return;
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if (GIMP_IS_BRUSH_PIXMAP (paint_core->brush))
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{
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/* if its a pixmap, do pixmap stuff */
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color_area_with_pixmap (paint_core, gimage, drawable, area,HARD );
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paint_appl_mode = INCREMENTAL;
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}
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else
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{
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/* color the pixels */
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gimage_get_foreground (gimage, drawable, col);
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col[area->bytes - 1] = OPAQUE_OPACITY;
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color_pixels (temp_buf_data (area), col,
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area->width * area->height, area->bytes);
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}
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/*Make the opacity dependent on the current pressure
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This makes a more natural pencil since light pressure
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on a graphite pen will give transparent line */
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if(pressure)
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{
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opacity = 255 * gimp_context_get_opacity (NULL) * (paint_core->curpressure / 0.5);
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if (opacity > 255)
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opacity = 255;
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}
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else
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{
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opacity = 255 * gimp_context_get_opacity (NULL);
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if (opacity > 255)
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opacity = 255;
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}
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/* paste the newly painted canvas to the gimage which is being worked on */
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paint_core_paste_canvas (paint_core, drawable, opacity,
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(int) (gimp_context_get_opacity (NULL) * 255),
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gimp_context_get_paint_mode (NULL),
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HARD, paint_appl_mode);
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}
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static void *
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pencil_non_gui_paint_func (PaintCore *paint_core,
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GimpDrawable *drawable,
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int state)
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{
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pencil_motion (paint_core, drawable, non_gui_incremental, non_gui_pressure);
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return NULL;
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}
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gboolean
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pencil_non_gui (GimpDrawable *drawable,
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int num_strokes,
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double *stroke_array)
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{
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int i;
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if (paint_core_init (&non_gui_paint_core, drawable,
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stroke_array[0], stroke_array[1]))
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{
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/* Set the paint core's paint func */
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non_gui_paint_core.paint_func = pencil_non_gui_paint_func;
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non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
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non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
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pencil_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
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for (i = 1; i < num_strokes; i++)
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{
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non_gui_paint_core.curx = stroke_array[i * 2 + 0];
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non_gui_paint_core.cury = stroke_array[i * 2 + 1];
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paint_core_interpolate (&non_gui_paint_core, drawable);
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non_gui_paint_core.lastx = non_gui_paint_core.curx;
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non_gui_paint_core.lasty = non_gui_paint_core.cury;
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}
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/* Finish the painting */
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paint_core_finish (&non_gui_paint_core, drawable, -1);
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/* Cleanup */
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paint_core_cleanup ();
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return TRUE;
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}
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else
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return FALSE;
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}
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