390 lines
16 KiB
C
390 lines
16 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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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 3 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, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "libpikabase/pikabase.h"
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#include "paint-types.h"
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#include "gegl/pika-gegl-utils.h"
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#include "core/pika.h"
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#include "core/pika-palettes.h"
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#include "core/pikabrush.h"
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#include "core/pikadrawable.h"
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#include "core/pikadynamics.h"
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#include "core/pikagradient.h"
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#include "core/pikaimage.h"
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#include "core/pikapickable.h"
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#include "core/pikasymmetry.h"
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#include "core/pikatempbuf.h"
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#include "pikapaintbrush.h"
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#include "pikapaintoptions.h"
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#include "pika-intl.h"
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static void pika_paintbrush_paint (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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PikaPaintState paint_state,
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guint32 time);
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static gboolean pika_paintbrush_real_get_color_history_color (PikaPaintbrush *paintbrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaRGB *color);
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static void pika_paintbrush_real_get_paint_params (PikaPaintbrush *paintbrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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gdouble grad_point,
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PikaLayerMode *paint_mode,
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PikaPaintApplicationMode *paint_appl_mode,
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const PikaTempBuf **paint_pixmap,
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PikaRGB *paint_color);
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G_DEFINE_TYPE (PikaPaintbrush, pika_paintbrush, PIKA_TYPE_BRUSH_CORE)
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void
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pika_paintbrush_register (Pika *pika,
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PikaPaintRegisterCallback callback)
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{
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(* callback) (pika,
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PIKA_TYPE_PAINTBRUSH,
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PIKA_TYPE_PAINT_OPTIONS,
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"pika-paintbrush",
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_("Paintbrush"),
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"pika-tool-paintbrush");
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}
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static void
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pika_paintbrush_class_init (PikaPaintbrushClass *klass)
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{
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PikaPaintCoreClass *paint_core_class = PIKA_PAINT_CORE_CLASS (klass);
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PikaBrushCoreClass *brush_core_class = PIKA_BRUSH_CORE_CLASS (klass);
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paint_core_class->paint = pika_paintbrush_paint;
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brush_core_class->handles_changing_brush = TRUE;
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klass->get_color_history_color = pika_paintbrush_real_get_color_history_color;
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klass->get_paint_params = pika_paintbrush_real_get_paint_params;
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}
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static void
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pika_paintbrush_init (PikaPaintbrush *paintbrush)
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{
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}
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static void
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pika_paintbrush_paint (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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PikaPaintState paint_state,
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guint32 time)
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{
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PikaPaintbrush *paintbrush = PIKA_PAINTBRUSH (paint_core);
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g_return_if_fail (g_list_length (drawables) == 1);
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switch (paint_state)
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{
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case PIKA_PAINT_STATE_INIT:
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{
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PikaRGB color;
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for (GList *iter = drawables; iter; iter = iter->next)
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if (PIKA_PAINTBRUSH_GET_CLASS (paintbrush)->get_color_history_color &&
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PIKA_PAINTBRUSH_GET_CLASS (paintbrush)->get_color_history_color (paintbrush,
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iter->data,
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paint_options,
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&color))
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{
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PikaContext *context = PIKA_CONTEXT (paint_options);
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pika_palettes_add_color_history (context->pika, &color);
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}
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}
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break;
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case PIKA_PAINT_STATE_MOTION:
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for (GList *iter = drawables; iter; iter = iter->next)
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_pika_paintbrush_motion (paint_core, iter->data, paint_options,
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sym, PIKA_OPACITY_OPAQUE);
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break;
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case PIKA_PAINT_STATE_FINISH:
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g_clear_weak_pointer (&paintbrush->paint_buffer);
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g_clear_pointer (&paintbrush->paint_pixmap, pika_temp_buf_unref);
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break;
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}
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}
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static gboolean
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pika_paintbrush_real_get_color_history_color (PikaPaintbrush *paintbrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaRGB *color)
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{
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PikaContext *context = PIKA_CONTEXT (paint_options);
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PikaBrushCore *brush_core = PIKA_BRUSH_CORE (paintbrush);
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PikaDynamics *dynamics = pika_context_get_dynamics (context);
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/* We don't save gradient color history and pixmap brushes
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* have no color to save.
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*/
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if (pika_dynamics_is_output_enabled (dynamics, PIKA_DYNAMICS_OUTPUT_COLOR) ||
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(brush_core->brush && pika_brush_get_pixmap (brush_core->brush)))
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{
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return FALSE;
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}
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pika_context_get_foreground (context, color);
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return TRUE;
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}
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static void
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pika_paintbrush_real_get_paint_params (PikaPaintbrush *paintbrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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gdouble grad_point,
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PikaLayerMode *paint_mode,
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PikaPaintApplicationMode *paint_appl_mode,
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const PikaTempBuf **paint_pixmap,
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PikaRGB *paint_color)
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{
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PikaPaintCore *paint_core = PIKA_PAINT_CORE (paintbrush);
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PikaBrushCore *brush_core = PIKA_BRUSH_CORE (paintbrush);
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PikaContext *context = PIKA_CONTEXT (paint_options);
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PikaImage *image = pika_item_get_image (PIKA_ITEM (drawable));
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*paint_mode = pika_context_get_paint_mode (context);
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if (pika_paint_options_get_gradient_color (paint_options, image,
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grad_point,
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paint_core->pixel_dist,
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paint_color))
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{
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/* optionally take the color from the current gradient */
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pika_pickable_srgb_to_image_color (PIKA_PICKABLE (drawable),
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paint_color, paint_color);
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*paint_appl_mode = PIKA_PAINT_INCREMENTAL;
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}
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else if (brush_core->brush && pika_brush_get_pixmap (brush_core->brush))
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{
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/* otherwise check if the brush has a pixmap and use that to
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* color the area
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*/
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*paint_pixmap = pika_brush_core_get_brush_pixmap (brush_core);
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*paint_appl_mode = PIKA_PAINT_INCREMENTAL;
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}
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else
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{
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/* otherwise fill the area with the foreground color */
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pika_context_get_foreground (context, paint_color);
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pika_pickable_srgb_to_image_color (PIKA_PICKABLE (drawable),
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paint_color, paint_color);
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}
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}
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void
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_pika_paintbrush_motion (PikaPaintCore *paint_core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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gdouble opacity)
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{
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PikaBrushCore *brush_core = PIKA_BRUSH_CORE (paint_core);
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PikaPaintbrush *paintbrush = PIKA_PAINTBRUSH (paint_core);
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PikaContext *context = PIKA_CONTEXT (paint_options);
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PikaDynamics *dynamics = brush_core->dynamics;
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PikaImage *image = pika_item_get_image (PIKA_ITEM (drawable));
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gdouble fade_point;
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gdouble grad_point;
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gdouble force;
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PikaCoords coords;
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gint n_strokes;
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gint off_x, off_y;
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gint i;
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fade_point = pika_paint_options_get_fade (paint_options, image,
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paint_core->pixel_dist);
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pika_item_get_offset (PIKA_ITEM (drawable), &off_x, &off_y);
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coords = *(pika_symmetry_get_origin (sym));
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coords.x -= off_x;
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coords.y -= off_y;
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pika_symmetry_set_origin (sym, drawable, &coords);
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/* Some settings are based on the original stroke. */
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opacity *= pika_dynamics_get_linear_value (dynamics,
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PIKA_DYNAMICS_OUTPUT_OPACITY,
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&coords,
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paint_options,
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fade_point);
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if (opacity == 0.0)
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return;
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if (PIKA_BRUSH_CORE_GET_CLASS (brush_core)->handles_transforming_brush)
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{
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pika_brush_core_eval_transform_dynamics (brush_core,
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image,
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paint_options,
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&coords);
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}
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grad_point = pika_dynamics_get_linear_value (dynamics,
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PIKA_DYNAMICS_OUTPUT_COLOR,
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&coords,
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paint_options,
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fade_point);
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n_strokes = pika_symmetry_get_size (sym);
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for (i = 0; i < n_strokes; i++)
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{
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PikaLayerMode paint_mode;
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PikaPaintApplicationMode paint_appl_mode;
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GeglBuffer *paint_buffer;
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gint paint_buffer_x;
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gint paint_buffer_y;
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const PikaTempBuf *paint_pixmap = NULL;
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PikaRGB paint_color;
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gint paint_width, paint_height;
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paint_appl_mode = paint_options->application_mode;
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PIKA_PAINTBRUSH_GET_CLASS (paintbrush)->get_paint_params (paintbrush,
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drawable,
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paint_options,
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sym,
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grad_point,
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&paint_mode,
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&paint_appl_mode,
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&paint_pixmap,
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&paint_color);
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coords = *(pika_symmetry_get_coords (sym, i));
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if (PIKA_BRUSH_CORE_GET_CLASS (brush_core)->handles_transforming_brush)
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pika_brush_core_eval_transform_symmetry (brush_core, sym, i);
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paint_buffer = pika_paint_core_get_paint_buffer (paint_core, drawable,
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paint_options,
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paint_mode,
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&coords,
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&paint_buffer_x,
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&paint_buffer_y,
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&paint_width,
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&paint_height);
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if (! paint_buffer)
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continue;
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if (! paint_pixmap)
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{
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opacity *= paint_color.a;
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pika_rgb_set_alpha (&paint_color, PIKA_OPACITY_OPAQUE);
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}
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/* fill the paint buffer. we can skip this step when reusing the
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* previous paint buffer, if the paint color/pixmap hasn't changed
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* (unless using an applicator, which currently modifies the paint buffer
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* in-place).
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*/
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if (paint_core->applicators ||
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paint_buffer != paintbrush->paint_buffer ||
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paint_pixmap != paintbrush->paint_pixmap ||
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(! paint_pixmap && (pika_rgba_distance (&paint_color,
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&paintbrush->paint_color))))
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{
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g_set_weak_pointer (&paintbrush->paint_buffer, paint_buffer);
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if (paint_pixmap != paintbrush->paint_pixmap)
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{
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g_clear_pointer (&paintbrush->paint_pixmap, pika_temp_buf_unref);
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if (paint_pixmap)
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paintbrush->paint_pixmap = pika_temp_buf_ref (paint_pixmap);
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}
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paintbrush->paint_color = paint_color;
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if (paint_pixmap)
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{
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pika_brush_core_color_area_with_pixmap (brush_core, drawable,
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&coords,
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paint_buffer,
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paint_buffer_x,
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paint_buffer_y,
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FALSE);
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}
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else
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{
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GeglColor *color;
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color = pika_gegl_color_new (&paint_color,
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pika_drawable_get_space (drawable));
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gegl_buffer_set_color (paint_buffer, NULL, color);
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g_object_unref (color);
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}
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}
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if (pika_dynamics_is_output_enabled (dynamics, PIKA_DYNAMICS_OUTPUT_FORCE))
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force = pika_dynamics_get_linear_value (dynamics,
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PIKA_DYNAMICS_OUTPUT_FORCE,
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&coords,
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paint_options,
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fade_point);
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else
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force = paint_options->brush_force;
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/* finally, let the brush core paste the colored area on the canvas */
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pika_brush_core_paste_canvas (brush_core, drawable,
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&coords,
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MIN (opacity, PIKA_OPACITY_OPAQUE),
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pika_context_get_opacity (context),
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paint_mode,
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pika_paint_options_get_brush_mode (paint_options),
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force,
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paint_appl_mode);
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}
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}
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