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PIKApp/app/tools/pikapainttool.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "tools-types.h"
#include "config/pikadisplayconfig.h"
#include "config/pikaguiconfig.h"
#include "core/pika.h"
#include "core/pika-utils.h"
#include "core/pikadrawable.h"
#include "core/pikaerror.h"
#include "core/pikaimage.h"
#include "core/pikalayer.h"
#include "core/pikapaintinfo.h"
#include "core/pikaprojection.h"
#include "core/pikatoolinfo.h"
#include "paint/pikapaintcore.h"
#include "paint/pikapaintoptions.h"
#include "widgets/pikadevices.h"
#include "widgets/pikawidgets-utils.h"
#include "display/pikadisplay.h"
#include "display/pikadisplayshell.h"
#include "display/pikadisplayshell-selection.h"
#include "display/pikadisplayshell-utils.h"
#include "pikacoloroptions.h"
#include "pikapaintoptions-gui.h"
#include "pikapainttool.h"
#include "pikapainttool-paint.h"
#include "pikatoolcontrol.h"
#include "pikatools-utils.h"
#include "pika-intl.h"
static void pika_paint_tool_constructed (GObject *object);
static void pika_paint_tool_finalize (GObject *object);
static void pika_paint_tool_control (PikaTool *tool,
PikaToolAction action,
PikaDisplay *display);
static void pika_paint_tool_button_press (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type,
PikaDisplay *display);
static void pika_paint_tool_button_release (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type,
PikaDisplay *display);
static void pika_paint_tool_motion (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaDisplay *display);
static void pika_paint_tool_modifier_key (PikaTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
PikaDisplay *display);
static void pika_paint_tool_cursor_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
PikaDisplay *display);
static void pika_paint_tool_oper_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity,
PikaDisplay *display);
static void pika_paint_tool_draw (PikaDrawTool *draw_tool);
static void
pika_paint_tool_real_paint_prepare (PikaPaintTool *paint_tool,
PikaDisplay *display);
static PikaCanvasItem *
pika_paint_tool_get_outline (PikaPaintTool *paint_tool,
PikaDisplay *display,
gdouble x,
gdouble y);
static gboolean pika_paint_tool_check_alpha (PikaPaintTool *paint_tool,
PikaDrawable *drawable,
PikaDisplay *display,
GError **error);
static void pika_paint_tool_hard_notify (PikaPaintOptions *options,
const GParamSpec *pspec,
PikaPaintTool *paint_tool);
static void pika_paint_tool_cursor_notify (PikaDisplayConfig *config,
GParamSpec *pspec,
PikaPaintTool *paint_tool);
G_DEFINE_TYPE (PikaPaintTool, pika_paint_tool, PIKA_TYPE_COLOR_TOOL)
#define parent_class pika_paint_tool_parent_class
static void
pika_paint_tool_class_init (PikaPaintToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaToolClass *tool_class = PIKA_TOOL_CLASS (klass);
PikaDrawToolClass *draw_tool_class = PIKA_DRAW_TOOL_CLASS (klass);
object_class->constructed = pika_paint_tool_constructed;
object_class->finalize = pika_paint_tool_finalize;
tool_class->control = pika_paint_tool_control;
tool_class->button_press = pika_paint_tool_button_press;
tool_class->button_release = pika_paint_tool_button_release;
tool_class->motion = pika_paint_tool_motion;
tool_class->modifier_key = pika_paint_tool_modifier_key;
tool_class->cursor_update = pika_paint_tool_cursor_update;
tool_class->oper_update = pika_paint_tool_oper_update;
draw_tool_class->draw = pika_paint_tool_draw;
klass->paint_prepare = pika_paint_tool_real_paint_prepare;
}
static void
pika_paint_tool_init (PikaPaintTool *paint_tool)
{
PikaTool *tool = PIKA_TOOL (paint_tool);
pika_tool_control_set_motion_mode (tool->control, PIKA_MOTION_MODE_EXACT);
pika_tool_control_set_scroll_lock (tool->control, TRUE);
pika_tool_control_set_action_opacity (tool->control,
"context-opacity-set");
paint_tool->active = TRUE;
paint_tool->pick_colors = FALSE;
paint_tool->can_multi_paint = FALSE;
paint_tool->draw_line = FALSE;
paint_tool->show_cursor = TRUE;
paint_tool->draw_brush = TRUE;
paint_tool->snap_brush = FALSE;
paint_tool->draw_fallback = FALSE;
paint_tool->fallback_size = 0.0;
paint_tool->draw_circle = FALSE;
paint_tool->circle_size = 0.0;
paint_tool->status = _("Click to paint");
paint_tool->status_line = _("Click to draw the line");
paint_tool->status_ctrl = _("%s to pick a color");
paint_tool->core = NULL;
}
static void
pika_paint_tool_constructed (GObject *object)
{
PikaTool *tool = PIKA_TOOL (object);
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (object);
PikaPaintOptions *options = PIKA_PAINT_TOOL_GET_OPTIONS (tool);
PikaDisplayConfig *display_config;
PikaPaintInfo *paint_info;
G_OBJECT_CLASS (parent_class)->constructed (object);
pika_assert (PIKA_IS_TOOL_INFO (tool->tool_info));
pika_assert (PIKA_IS_PAINT_INFO (tool->tool_info->paint_info));
display_config = PIKA_DISPLAY_CONFIG (tool->tool_info->pika->config);
paint_info = tool->tool_info->paint_info;
pika_assert (g_type_is_a (paint_info->paint_type, PIKA_TYPE_PAINT_CORE));
paint_tool->core = g_object_new (paint_info->paint_type,
"undo-desc", paint_info->blurb,
NULL);
g_signal_connect_object (options, "notify::hard",
G_CALLBACK (pika_paint_tool_hard_notify),
paint_tool, 0);
pika_paint_tool_hard_notify (options, NULL, paint_tool);
paint_tool->show_cursor = display_config->show_paint_tool_cursor;
paint_tool->draw_brush = display_config->show_brush_outline;
paint_tool->snap_brush = display_config->snap_brush_outline;
g_signal_connect_object (display_config, "notify::show-paint-tool-cursor",
G_CALLBACK (pika_paint_tool_cursor_notify),
paint_tool, 0);
g_signal_connect_object (display_config, "notify::show-brush-outline",
G_CALLBACK (pika_paint_tool_cursor_notify),
paint_tool, 0);
g_signal_connect_object (display_config, "notify::snap-brush-outline",
G_CALLBACK (pika_paint_tool_cursor_notify),
paint_tool, 0);
}
static void
pika_paint_tool_finalize (GObject *object)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (object);
if (paint_tool->core)
{
g_object_unref (paint_tool->core);
paint_tool->core = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_paint_tool_control (PikaTool *tool,
PikaToolAction action,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
switch (action)
{
case PIKA_TOOL_ACTION_PAUSE:
case PIKA_TOOL_ACTION_RESUME:
break;
case PIKA_TOOL_ACTION_HALT:
pika_paint_core_cleanup (paint_tool->core);
break;
case PIKA_TOOL_ACTION_COMMIT:
break;
}
PIKA_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static void
pika_paint_tool_button_press (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type,
PikaDisplay *display)
{
PikaDrawTool *draw_tool = PIKA_DRAW_TOOL (tool);
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PikaPaintOptions *options = PIKA_PAINT_TOOL_GET_OPTIONS (tool);
PikaGuiConfig *config = PIKA_GUI_CONFIG (display->pika->config);
PikaDisplayShell *shell = pika_display_get_shell (display);
PikaImage *image = pika_display_get_image (display);
GList *drawables;
GList *iter;
gboolean constrain;
GError *error = NULL;
if (pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
PIKA_TOOL_CLASS (parent_class)->button_press (tool, coords, time, state,
press_type, display);
return;
}
drawables = pika_image_get_selected_drawables (image);
if (drawables == NULL)
{
pika_tool_message_literal (tool, display,
_("No selected drawables."));
return;
}
else if (! paint_tool->can_multi_paint)
{
if (g_list_length (drawables) != 1)
{
pika_tool_message_literal (tool, display,
_("Cannot paint on multiple layers. Select only one layer."));
g_list_free (drawables);
return;
}
}
for (iter = drawables; iter; iter = iter->next)
{
PikaDrawable *drawable = iter->data;
PikaItem *locked_item = NULL;
if (pika_viewable_get_children (PIKA_VIEWABLE (drawable)))
{
pika_tool_message_literal (tool, display,
_("Cannot paint on layer groups."));
g_list_free (drawables);
return;
}
if (pika_item_is_content_locked (PIKA_ITEM (drawable), &locked_item))
{
pika_tool_message_literal (tool, display,
_("The selected item's pixels are locked."));
pika_tools_blink_lock_box (display->pika, locked_item);
g_list_free (drawables);
return;
}
if (! pika_paint_tool_check_alpha (paint_tool, drawable, display, &error))
{
GtkWidget *options_gui;
GtkWidget *mode_box;
pika_tool_message_literal (tool, display, error->message);
options_gui = pika_tools_get_tool_options_gui (PIKA_TOOL_OPTIONS (options));
mode_box = pika_paint_options_gui_get_paint_mode_box (options_gui);
if (gtk_widget_is_sensitive (mode_box))
{
pika_tools_show_tool_options (display->pika);
pika_widget_blink (mode_box);
}
g_clear_error (&error);
g_list_free (drawables);
return;
}
if (! pika_item_is_visible (PIKA_ITEM (drawable)) &&
! config->edit_non_visible)
{
pika_tool_message_literal (tool, display,
_("A selected layer is not visible."));
g_list_free (drawables);
return;
}
}
if (pika_draw_tool_is_active (draw_tool))
pika_draw_tool_stop (draw_tool);
if (tool->display &&
tool->display != display &&
pika_display_get_image (tool->display) == image)
{
/* if this is a different display, but the same image, HACK around
* in tool internals AFTER stopping the current draw_tool, so
* straight line drawing works across different views of the
* same image.
*/
tool->display = display;
}
constrain = (state & pika_get_constrain_behavior_mask ()) != 0;
if (! pika_paint_tool_paint_start (paint_tool,
display, coords, time, constrain,
&error))
{
pika_tool_message_literal (tool, display, error->message);
g_clear_error (&error);
return;
}
tool->display = display;
tool->drawables = drawables;
/* pause the current selection */
pika_display_shell_selection_pause (shell);
pika_draw_tool_start (draw_tool, display);
pika_tool_control_activate (tool->control);
}
static void
pika_paint_tool_button_release (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PikaDisplayShell *shell = pika_display_get_shell (display);
PikaImage *image = pika_display_get_image (display);
gboolean cancel;
if (pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
PIKA_TOOL_CLASS (parent_class)->button_release (tool, coords, time,
state, release_type,
display);
return;
}
cancel = (release_type == PIKA_BUTTON_RELEASE_CANCEL);
pika_paint_tool_paint_end (paint_tool, time, cancel);
pika_tool_control_halt (tool->control);
pika_draw_tool_pause (PIKA_DRAW_TOOL (tool));
/* resume the current selection */
pika_display_shell_selection_resume (shell);
pika_image_flush (image);
pika_draw_tool_resume (PIKA_DRAW_TOOL (tool));
}
static void
pika_paint_tool_motion (PikaTool *tool,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PIKA_TOOL_CLASS (parent_class)->motion (tool, coords, time, state, display);
if (pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
return;
if (! paint_tool->snap_brush)
pika_draw_tool_pause (PIKA_DRAW_TOOL (tool));
pika_paint_tool_paint_motion (paint_tool, coords, time);
if (! paint_tool->snap_brush)
pika_draw_tool_resume (PIKA_DRAW_TOOL (tool));
}
static void
pika_paint_tool_modifier_key (PikaTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PikaDrawTool *draw_tool = PIKA_DRAW_TOOL (tool);
if (paint_tool->pick_colors && ! paint_tool->draw_line)
{
if ((state & pika_get_all_modifiers_mask ()) ==
pika_get_constrain_behavior_mask ())
{
if (! pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
PikaToolInfo *info = pika_get_tool_info (display->pika,
"pika-color-picker-tool");
if (PIKA_IS_TOOL_INFO (info))
{
if (pika_draw_tool_is_active (draw_tool))
pika_draw_tool_stop (draw_tool);
pika_color_tool_enable (PIKA_COLOR_TOOL (tool),
PIKA_COLOR_OPTIONS (info->tool_options));
switch (PIKA_COLOR_TOOL (tool)->pick_target)
{
case PIKA_COLOR_PICK_TARGET_FOREGROUND:
pika_tool_push_status (tool, display,
_("Click in any image to pick the "
"foreground color"));
break;
case PIKA_COLOR_PICK_TARGET_BACKGROUND:
pika_tool_push_status (tool, display,
_("Click in any image to pick the "
"background color"));
break;
default:
break;
}
}
}
}
else
{
if (pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
pika_tool_pop_status (tool, display);
pika_color_tool_disable (PIKA_COLOR_TOOL (tool));
}
}
}
}
static void
pika_paint_tool_cursor_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PikaGuiConfig *config = PIKA_GUI_CONFIG (display->pika->config);
PikaCursorModifier modifier;
PikaCursorModifier toggle_modifier;
PikaCursorModifier old_modifier;
PikaCursorModifier old_toggle_modifier;
modifier = tool->control->cursor_modifier;
toggle_modifier = tool->control->toggle_cursor_modifier;
old_modifier = modifier;
old_toggle_modifier = toggle_modifier;
if (! pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
PikaImage *image = pika_display_get_image (display);
GList *drawables = pika_image_get_selected_drawables (image);
GList *iter;
if (! drawables)
return;
for (iter = drawables; iter; iter = iter->next)
{
PikaDrawable *drawable = iter->data;
if (pika_viewable_get_children (PIKA_VIEWABLE (drawable)) ||
pika_item_is_content_locked (PIKA_ITEM (drawable), NULL) ||
! pika_paint_tool_check_alpha (paint_tool, drawable, display, NULL) ||
! (pika_item_is_visible (PIKA_ITEM (drawable)) ||
config->edit_non_visible))
{
modifier = PIKA_CURSOR_MODIFIER_BAD;
toggle_modifier = PIKA_CURSOR_MODIFIER_BAD;
break;
}
}
g_list_free (drawables);
if (! paint_tool->show_cursor &&
modifier != PIKA_CURSOR_MODIFIER_BAD)
{
if (paint_tool->draw_brush)
pika_tool_set_cursor (tool, display,
PIKA_CURSOR_NONE,
PIKA_TOOL_CURSOR_NONE,
PIKA_CURSOR_MODIFIER_NONE);
else
pika_tool_set_cursor (tool, display,
PIKA_CURSOR_SINGLE_DOT,
PIKA_TOOL_CURSOR_NONE,
PIKA_CURSOR_MODIFIER_NONE);
return;
}
pika_tool_control_set_cursor_modifier (tool->control,
modifier);
pika_tool_control_set_toggle_cursor_modifier (tool->control,
toggle_modifier);
}
PIKA_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state,
display);
/* reset old stuff here so we are not interfering with the modifiers
* set by our subclasses
*/
pika_tool_control_set_cursor_modifier (tool->control,
old_modifier);
pika_tool_control_set_toggle_cursor_modifier (tool->control,
old_toggle_modifier);
}
static void
pika_paint_tool_oper_update (PikaTool *tool,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity,
PikaDisplay *display)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (tool);
PikaDrawTool *draw_tool = PIKA_DRAW_TOOL (tool);
PikaPaintOptions *paint_options = PIKA_PAINT_TOOL_GET_OPTIONS (tool);
PikaPaintCore *core = paint_tool->core;
PikaDisplayShell *shell = pika_display_get_shell (display);
PikaImage *image = pika_display_get_image (display);
GList *drawables;
gchar *status = NULL;
if (pika_color_tool_is_enabled (PIKA_COLOR_TOOL (tool)))
{
PIKA_TOOL_CLASS (parent_class)->oper_update (tool, coords, state,
proximity, display);
return;
}
pika_draw_tool_pause (draw_tool);
if (pika_draw_tool_is_active (draw_tool) &&
draw_tool->display != display)
pika_draw_tool_stop (draw_tool);
if (tool->display &&
tool->display != display &&
pika_display_get_image (tool->display) == image)
{
/* if this is a different display, but the same image, HACK around
* in tool internals AFTER stopping the current draw_tool, so
* straight line drawing works across different views of the
* same image.
*/
tool->display = display;
}
drawables = pika_image_get_selected_drawables (image);
if ((g_list_length (drawables) == 1 ||
(g_list_length (drawables) > 1 && paint_tool->can_multi_paint)) &&
proximity)
{
gboolean constrain_mask = pika_get_constrain_behavior_mask ();
core->cur_coords = *coords;
if (display == tool->display && (state & PIKA_PAINT_TOOL_LINE_MASK))
{
/* If shift is down and this is not the first paint stroke,
* draw a line.
*/
gchar *status_help;
gdouble offset_angle;
gdouble xres, yres;
pika_display_shell_get_constrained_line_params (shell,
&offset_angle,
&xres, &yres);
pika_paint_core_round_line (core, paint_options,
(state & constrain_mask) != 0,
offset_angle, xres, yres);
status_help = pika_suggest_modifiers (paint_tool->status_line,
constrain_mask & ~state,
NULL,
_("%s for constrained angles"),
NULL);
status = pika_display_shell_get_line_status (shell, status_help,
". ",
core->last_coords.x,
core->last_coords.y,
core->cur_coords.x,
core->cur_coords.y);
g_free (status_help);
paint_tool->draw_line = TRUE;
}
else
{
GdkModifierType modifiers = 0;
/* HACK: A paint tool may set status_ctrl to NULL to indicate that
* it ignores the Ctrl modifier (temporarily or permanently), so
* it should not be suggested. This is different from how
* pika_suggest_modifiers() would interpret this parameter.
*/
if (paint_tool->status_ctrl != NULL)
modifiers |= constrain_mask;
/* suggest drawing lines only after the first point is set
*/
if (display == tool->display)
modifiers |= PIKA_PAINT_TOOL_LINE_MASK;
status = pika_suggest_modifiers (paint_tool->status,
modifiers & ~state,
_("%s for a straight line"),
paint_tool->status_ctrl,
NULL);
paint_tool->draw_line = FALSE;
}
paint_tool->cursor_x = core->cur_coords.x;
paint_tool->cursor_y = core->cur_coords.y;
if (! pika_draw_tool_is_active (draw_tool))
pika_draw_tool_start (draw_tool, display);
}
else if (pika_draw_tool_is_active (draw_tool))
{
pika_draw_tool_stop (draw_tool);
}
if (status != NULL)
{
pika_tool_push_status (tool, display, "%s", status);
g_free (status);
}
else
{
pika_tool_pop_status (tool, display);
}
PIKA_TOOL_CLASS (parent_class)->oper_update (tool, coords, state, proximity,
display);
pika_draw_tool_resume (draw_tool);
g_list_free (drawables);
}
static void
pika_paint_tool_draw (PikaDrawTool *draw_tool)
{
PikaPaintTool *paint_tool = PIKA_PAINT_TOOL (draw_tool);
if (paint_tool->active &&
! pika_color_tool_is_enabled (PIKA_COLOR_TOOL (draw_tool)))
{
PikaPaintCore *core = paint_tool->core;
PikaCanvasItem *outline = NULL;
gboolean line_drawn = FALSE;
gdouble cur_x, cur_y;
if (pika_paint_tool_paint_is_active (paint_tool) &&
paint_tool->snap_brush)
{
cur_x = paint_tool->paint_x;
cur_y = paint_tool->paint_y;
}
else
{
cur_x = paint_tool->cursor_x;
cur_y = paint_tool->cursor_y;
if (paint_tool->draw_line &&
! pika_tool_control_is_active (PIKA_TOOL (draw_tool)->control))
{
PikaCanvasGroup *group;
gdouble last_x, last_y;
last_x = core->last_coords.x;
last_y = core->last_coords.y;
group = pika_draw_tool_add_stroke_group (draw_tool);
pika_draw_tool_push_group (draw_tool, group);
pika_draw_tool_add_handle (draw_tool,
PIKA_HANDLE_CIRCLE,
last_x, last_y,
PIKA_TOOL_HANDLE_SIZE_CIRCLE,
PIKA_TOOL_HANDLE_SIZE_CIRCLE,
PIKA_HANDLE_ANCHOR_CENTER);
pika_draw_tool_add_line (draw_tool,
last_x, last_y,
cur_x, cur_y);
pika_draw_tool_add_handle (draw_tool,
PIKA_HANDLE_CIRCLE,
cur_x, cur_y,
PIKA_TOOL_HANDLE_SIZE_CIRCLE,
PIKA_TOOL_HANDLE_SIZE_CIRCLE,
PIKA_HANDLE_ANCHOR_CENTER);
pika_draw_tool_pop_group (draw_tool);
line_drawn = TRUE;
}
}
pika_paint_tool_set_draw_fallback (paint_tool, FALSE, 0.0);
pika_paint_tool_set_draw_circle (paint_tool, FALSE, 0.0);
if (paint_tool->draw_brush)
outline = pika_paint_tool_get_outline (paint_tool,
draw_tool->display,
cur_x, cur_y);
if (outline)
{
pika_draw_tool_add_item (draw_tool, outline);
g_object_unref (outline);
}
else if (paint_tool->draw_fallback)
{
/* Lets make a sensible fallback cursor
*
* Sensible cursor is
* * crossed to indicate draw point
* * reactive to options alterations
* * not a full circle that would be in the way
*/
gint size = (gint) paint_tool->fallback_size;
#define TICKMARK_ANGLE 48
#define ROTATION_ANGLE G_PI / 4
/* marks for indicating full size */
pika_draw_tool_add_arc (draw_tool,
FALSE,
cur_x - (size / 2.0),
cur_y - (size / 2.0),
size, size,
ROTATION_ANGLE - (2.0 * G_PI) / (TICKMARK_ANGLE * 2),
(2.0 * G_PI) / TICKMARK_ANGLE);
pika_draw_tool_add_arc (draw_tool,
FALSE,
cur_x - (size / 2.0),
cur_y - (size / 2.0),
size, size,
ROTATION_ANGLE + G_PI / 2 - (2.0 * G_PI) / (TICKMARK_ANGLE * 2),
(2.0 * G_PI) / TICKMARK_ANGLE);
pika_draw_tool_add_arc (draw_tool,
FALSE,
cur_x - (size / 2.0),
cur_y - (size / 2.0),
size, size,
ROTATION_ANGLE + G_PI - (2.0 * G_PI) / (TICKMARK_ANGLE * 2),
(2.0 * G_PI) / TICKMARK_ANGLE);
pika_draw_tool_add_arc (draw_tool,
FALSE,
cur_x - (size / 2.0),
cur_y - (size / 2.0),
size, size,
ROTATION_ANGLE + 3 * G_PI / 2 - (2.0 * G_PI) / (TICKMARK_ANGLE * 2),
(2.0 * G_PI) / TICKMARK_ANGLE);
}
else if (paint_tool->draw_circle)
{
gint size = (gint) paint_tool->circle_size;
/* draw an indicatory circle */
pika_draw_tool_add_arc (draw_tool,
FALSE,
cur_x - (size / 2.0),
cur_y - (size / 2.0),
size, size,
0.0, (2.0 * G_PI));
}
if (! outline &&
! paint_tool->draw_fallback &&
! line_drawn &&
! paint_tool->show_cursor &&
! paint_tool->draw_circle)
{
/* I am not sure this case can/should ever happen since now we
* always set the PIKA_CURSOR_SINGLE_DOT when neither pointer
* nor outline options are checked. Yet let's imagine any
* weird case where brush outline is wanted, without pointer
* cursor, yet we fail to draw the outline while neither
* circle nor fallbacks are requested (it depends on per-class
* implementation of get_outline()).
*
* In such a case, we don't want to leave the user without any
* indication so we draw a fallback crosshair.
*/
if (paint_tool->draw_brush)
pika_draw_tool_add_handle (draw_tool,
PIKA_HANDLE_CIRCLE,
cur_x, cur_y,
PIKA_TOOL_HANDLE_SIZE_CROSSHAIR,
PIKA_TOOL_HANDLE_SIZE_CROSSHAIR,
PIKA_HANDLE_ANCHOR_CENTER);
}
}
PIKA_DRAW_TOOL_CLASS (parent_class)->draw (draw_tool);
}
static void
pika_paint_tool_real_paint_prepare (PikaPaintTool *paint_tool,
PikaDisplay *display)
{
PikaDisplayShell *shell = pika_display_get_shell (display);
pika_paint_core_set_show_all (paint_tool->core, shell->show_all);
}
static PikaCanvasItem *
pika_paint_tool_get_outline (PikaPaintTool *paint_tool,
PikaDisplay *display,
gdouble x,
gdouble y)
{
if (PIKA_PAINT_TOOL_GET_CLASS (paint_tool)->get_outline)
return PIKA_PAINT_TOOL_GET_CLASS (paint_tool)->get_outline (paint_tool,
display, x, y);
return NULL;
}
static gboolean
pika_paint_tool_check_alpha (PikaPaintTool *paint_tool,
PikaDrawable *drawable,
PikaDisplay *display,
GError **error)
{
PikaPaintToolClass *klass = PIKA_PAINT_TOOL_GET_CLASS (paint_tool);
if (klass->is_alpha_only && klass->is_alpha_only (paint_tool, drawable))
{
PikaLayer *locked_layer = NULL;
if (! pika_drawable_has_alpha (drawable))
{
g_set_error_literal (
error, PIKA_ERROR, PIKA_FAILED,
_("The selected drawable does not have an alpha channel."));
return FALSE;
}
if (PIKA_IS_LAYER (drawable) &&
pika_layer_is_alpha_locked (PIKA_LAYER (drawable),
&locked_layer))
{
g_set_error_literal (
error, PIKA_ERROR, PIKA_FAILED,
_("The selected layer's alpha channel is locked."));
if (error)
pika_tools_blink_lock_box (display->pika, PIKA_ITEM (locked_layer));
return FALSE;
}
}
return TRUE;
}
static void
pika_paint_tool_hard_notify (PikaPaintOptions *options,
const GParamSpec *pspec,
PikaPaintTool *paint_tool)
{
if (paint_tool->active)
{
PikaTool *tool = PIKA_TOOL (paint_tool);
pika_tool_control_set_precision (tool->control,
options->hard ?
PIKA_CURSOR_PRECISION_PIXEL_CENTER :
PIKA_CURSOR_PRECISION_SUBPIXEL);
}
}
static void
pika_paint_tool_cursor_notify (PikaDisplayConfig *config,
GParamSpec *pspec,
PikaPaintTool *paint_tool)
{
pika_draw_tool_pause (PIKA_DRAW_TOOL (paint_tool));
paint_tool->show_cursor = config->show_paint_tool_cursor;
paint_tool->draw_brush = config->show_brush_outline;
paint_tool->snap_brush = config->snap_brush_outline;
pika_draw_tool_resume (PIKA_DRAW_TOOL (paint_tool));
}
void
pika_paint_tool_set_active (PikaPaintTool *tool,
gboolean active)
{
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
if (active != tool->active)
{
PikaPaintOptions *options = PIKA_PAINT_TOOL_GET_OPTIONS (tool);
pika_draw_tool_pause (PIKA_DRAW_TOOL (tool));
tool->active = active;
if (active)
pika_paint_tool_hard_notify (options, NULL, tool);
pika_draw_tool_resume (PIKA_DRAW_TOOL (tool));
}
}
/**
* pika_paint_tool_enable_color_picker:
* @tool: a #PikaPaintTool
* @target: the #PikaColorPickTarget to set
*
* This is a convenience function used from the init method of paint
* tools that want the color picking functionality. The @mode that is
* set here is used to decide what cursor modifier to draw and if the
* picked color goes to the foreground or background color.
**/
void
pika_paint_tool_enable_color_picker (PikaPaintTool *tool,
PikaColorPickTarget target)
{
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
tool->pick_colors = TRUE;
PIKA_COLOR_TOOL (tool)->pick_target = target;
}
/**
* pika_paint_tool_enable_multi_paint:
* @tool: a #PikaPaintTool
*
* This is a convenience function used from the init method of paint
* tools that want to allow painting with several drawables.
**/
void
pika_paint_tool_enable_multi_paint (PikaPaintTool *tool)
{
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
tool->can_multi_paint = TRUE;
}
void
pika_paint_tool_set_draw_fallback (PikaPaintTool *tool,
gboolean draw_fallback,
gint fallback_size)
{
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
tool->draw_fallback = draw_fallback;
tool->fallback_size = fallback_size;
}
void
pika_paint_tool_set_draw_circle (PikaPaintTool *tool,
gboolean draw_circle,
gint circle_size)
{
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
tool->draw_circle = draw_circle;
tool->circle_size = circle_size;
}
/**
* pika_paint_tool_force_draw:
* @tool:
* @force:
*
* If @force is %TRUE, the brush, or a fallback, or circle will be
* drawn, regardless of the Preferences settings. This can be used for
* code such as when modifying brush size or shape on-canvas with a
* visual feedback, temporarily bypassing the user setting.
*/
void
pika_paint_tool_force_draw (PikaPaintTool *tool,
gboolean force)
{
PikaDisplayConfig *display_config;
g_return_if_fail (PIKA_IS_PAINT_TOOL (tool));
display_config = PIKA_DISPLAY_CONFIG (PIKA_TOOL (tool)->tool_info->pika->config);
if (force)
tool->draw_brush = TRUE;
else
tool->draw_brush = display_config->show_brush_outline;
}