mirror of https://github.com/GNOME/gimp.git
269 lines
8.0 KiB
C
269 lines
8.0 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 "config.h"
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#include <glib-object.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpbase/gimpbase.h"
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#include "paint-types.h"
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#include "base/temp-buf.h"
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#include "paint-funcs/paint-funcs.h"
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#include "core/gimp.h"
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#include "core/gimpbrush.h"
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#include "core/gimpdrawable.h"
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#include "core/gimpgradient.h"
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#include "core/gimpimage.h"
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#include "gimppaintbrush.h"
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#include "gimppaintoptions.h"
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#include "gimp-intl.h"
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static void gimp_paintbrush_class_init (GimpPaintbrushClass *klass);
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static void gimp_paintbrush_init (GimpPaintbrush *paintbrush);
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static void gimp_paintbrush_paint (GimpPaintCore *paint_core,
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GimpDrawable *drawable,
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GimpPaintOptions *paint_options,
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GimpPaintCoreState paint_state);
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static GimpPaintCoreClass *parent_class = NULL;
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void
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gimp_paintbrush_register (Gimp *gimp,
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GimpPaintRegisterCallback callback)
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{
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(* callback) (gimp,
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GIMP_TYPE_PAINTBRUSH,
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GIMP_TYPE_PAINT_OPTIONS,
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_("Paintbrush"));
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}
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GType
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gimp_paintbrush_get_type (void)
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{
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static GType type = 0;
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if (! type)
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{
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static const GTypeInfo info =
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{
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sizeof (GimpPaintbrushClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gimp_paintbrush_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpPaintbrush),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_paintbrush_init,
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};
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type = g_type_register_static (GIMP_TYPE_PAINT_CORE,
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"GimpPaintbrush",
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&info, 0);
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}
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return type;
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}
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static void
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gimp_paintbrush_class_init (GimpPaintbrushClass *klass)
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{
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GimpPaintCoreClass *paint_core_class;
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paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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paint_core_class->paint = gimp_paintbrush_paint;
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}
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static void
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gimp_paintbrush_init (GimpPaintbrush *paintbrush)
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{
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GimpPaintCore *paint_core;
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paint_core = GIMP_PAINT_CORE (paintbrush);
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paint_core->flags |= CORE_HANDLES_CHANGING_BRUSH;
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}
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static void
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gimp_paintbrush_paint (GimpPaintCore *paint_core,
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GimpDrawable *drawable,
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GimpPaintOptions *paint_options,
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GimpPaintCoreState paint_state)
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{
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switch (paint_state)
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{
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case MOTION_PAINT:
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_gimp_paintbrush_motion (paint_core, drawable, paint_options,
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GIMP_OPACITY_OPAQUE);
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break;
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default:
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break;
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}
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}
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void
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_gimp_paintbrush_motion (GimpPaintCore *paint_core,
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GimpDrawable *drawable,
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GimpPaintOptions *paint_options,
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gdouble opacity)
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{
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GimpPressureOptions *pressure_options;
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GimpFadeOptions *fade_options;
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GimpGradientOptions *gradient_options;
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GimpContext *context;
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GimpImage *gimage;
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TempBuf *area;
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gdouble gradient_length;
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guchar col[MAX_CHANNELS];
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gdouble scale;
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GimpPaintApplicationMode paint_appl_mode;
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context = GIMP_CONTEXT (paint_options);
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pressure_options = paint_options->pressure_options;
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fade_options = paint_options->fade_options;
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gradient_options = paint_options->gradient_options;
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if (! (gimage = gimp_item_get_image (GIMP_ITEM (drawable))))
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return;
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opacity *= gimp_paint_options_get_fade (paint_options, gimage,
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paint_core->pixel_dist);
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if (opacity == 0.0)
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return;
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paint_appl_mode = paint_options->application_mode;
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if (gradient_options->use_gradient)
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{
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gdouble unit_factor;
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switch (gradient_options->gradient_unit)
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{
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case GIMP_UNIT_PIXEL:
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gradient_length = gradient_options->gradient_length;
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break;
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case GIMP_UNIT_PERCENT:
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gradient_length = (MAX (gimage->width, gimage->height) *
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gradient_options->gradient_length / 100);
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break;
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default:
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unit_factor = gimp_unit_get_factor (gradient_options->gradient_unit);
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gradient_length = (gradient_options->gradient_length *
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MAX (gimage->xresolution,
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gimage->yresolution) / unit_factor);
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break;
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}
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}
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else
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{
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gradient_length = 0.0;
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}
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if (pressure_options->color)
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gradient_length = 1.0; /* not really used, only for if cases */
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if (pressure_options->size)
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scale = paint_core->cur_coords.pressure;
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else
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scale = 1.0;
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/* Get a region which can be used to paint to */
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if (! (area = gimp_paint_core_get_paint_area (paint_core, drawable, scale)))
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return;
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if (gradient_length)
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{
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GimpGradient *gradient;
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GimpRGB color;
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gradient = gimp_context_get_gradient (context);
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if (pressure_options->color)
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gimp_gradient_get_color_at (gradient,
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paint_core->cur_coords.pressure,
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&color);
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else
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gimp_paint_core_get_color_from_gradient (paint_core,
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gradient,
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gradient_length,
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&color,
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gradient_options->gradient_type);
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opacity *= color.a;
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gimp_rgb_get_uchar (&color,
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&col[RED_PIX],
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&col[GREEN_PIX],
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&col[BLUE_PIX]);
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col[ALPHA_PIX] = OPAQUE_OPACITY;
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color_pixels (temp_buf_data (area), col,
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area->width * area->height,
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area->bytes);
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paint_appl_mode = GIMP_PAINT_INCREMENTAL;
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}
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else if (paint_core->brush && paint_core->brush->pixmap)
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{
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/* if it's a pixmap, do pixmap stuff */
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gimp_paint_core_color_area_with_pixmap (paint_core, gimage, drawable,
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area,
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scale,
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gimp_paint_options_get_brush_mode (paint_options));
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paint_appl_mode = GIMP_PAINT_INCREMENTAL;
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}
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else
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{
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gimp_image_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,
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area->bytes);
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}
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if (pressure_options->opacity)
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opacity *= 2.0 * paint_core->cur_coords.pressure;
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gimp_paint_core_paste_canvas (paint_core, drawable,
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MIN (opacity, GIMP_OPACITY_OPAQUE),
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gimp_context_get_opacity (context),
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gimp_context_get_paint_mode (context),
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gimp_paint_options_get_brush_mode (paint_options),
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scale,
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paint_appl_mode);
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}
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