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78262ef745
2003-07-14 Michael Natterer <mitch@gimp.org> * app/paint/gimperaseroptions.[ch]: removed "gboolean hard" member/property... * app/paint/gimppaintoptions.[ch]: ...and added it here. Added gimp_paint_options_get_brush_mode() utility function. * app/paint/gimpairbrush.c * app/paint/gimpclone.c * app/paint/gimpconvolve.c * app/paint/gimpdodgeburn.c * app/paint/gimperaser.c * app/paint/gimppaintbrush.c * app/paint/gimppaintcore.h * app/paint/gimppencil.c * app/paint/gimpsmudge.c: use the new utility funtion where appropriate. Removed trailing whitespace. * app/tools/gimpdrawtool.[ch] (gimp_paint_tool_draw_boundary): changed offset parameters from gint to gdouble so we can show the brush preview at sub-pixel positions. * app/tools/gimppainttool.c: use sub-pixel coordinates for the brush preview if paint_options->hard is FALSE (doesn't work for the pencil yet). The new brush preview unveiled that the positioning of even-sized brushes if off by 0.5 for soft brush application mode and off by 1.0 for hard application mode: * app/paint/gimppaintcore.[ch] (gimp_paint_core_subsample_mask): offset painting by 0.5 pixels on the brushes' even sized axes by shuffling the subsample matrices around. Added "subsampling" for HARD brush application mode since a pixel of an even sized brush can snap to up to four different image pixels depending on the sub-pixel coordinates of the stroke.
188 lines
5.1 KiB
C
188 lines
5.1 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 "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/gimpdrawable.h"
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#include "core/gimpimage.h"
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#include "gimperaser.h"
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#include "gimperaseroptions.h"
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#include "gimp-intl.h"
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static void gimp_eraser_class_init (GimpEraserClass *klass);
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static void gimp_eraser_init (GimpEraser *eraser);
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static void gimp_eraser_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 void gimp_eraser_motion (GimpPaintCore *paint_core,
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GimpDrawable *drawable,
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GimpPaintOptions *paint_options);
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static GimpPaintCoreClass *parent_class = NULL;
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void
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gimp_eraser_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_ERASER,
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GIMP_TYPE_ERASER_OPTIONS,
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_("Eraser"));
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}
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GType
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gimp_eraser_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 (GimpEraserClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gimp_eraser_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpEraser),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_eraser_init,
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};
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type = g_type_register_static (GIMP_TYPE_PAINT_CORE,
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"GimpEraser",
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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_eraser_class_init (GimpEraserClass *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_eraser_paint;
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}
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static void
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gimp_eraser_init (GimpEraser *eraser)
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{
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GimpPaintCore *paint_core;
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paint_core = GIMP_PAINT_CORE (eraser);
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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_eraser_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_eraser_motion (paint_core, drawable, paint_options);
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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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static void
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gimp_eraser_motion (GimpPaintCore *paint_core,
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GimpDrawable *drawable,
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GimpPaintOptions *paint_options)
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{
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GimpEraserOptions *options;
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GimpPressureOptions *pressure_options;
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GimpContext *context;
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GimpImage *gimage;
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gdouble opacity;
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TempBuf *area;
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guchar col[MAX_CHANNELS];
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gdouble scale;
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if (! (gimage = gimp_item_get_image (GIMP_ITEM (drawable))))
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return;
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options = GIMP_ERASER_OPTIONS (paint_options);
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context = GIMP_CONTEXT (paint_options);
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pressure_options = paint_options->pressure_options;
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gimp_image_get_background (gimage, drawable, col);
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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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/* set the alpha channel */
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col[area->bytes - 1] = OPAQUE_OPACITY;
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/* color the pixels */
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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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opacity = gimp_context_get_opacity (context);
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if (pressure_options->opacity)
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opacity = 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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(options->anti_erase ?
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GIMP_ANTI_ERASE_MODE : GIMP_ERASE_MODE),
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gimp_paint_options_get_brush_mode (paint_options),
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scale,
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paint_options->application_mode);
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}
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