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gimp/app/tools/gimppainttool.c

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/* GIMP - The GNU Image Manipulation Program
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "tools-types.h"
#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimppaintinfo.h"
#include "core/gimpprojection.h"
#include "core/gimptoolinfo.h"
#include "core/gimpunit.h"
#include "paint/gimppaintcore.h"
#include "paint/gimppaintoptions.h"
#include "widgets/gimpdevices.h"
#include "widgets/gimpwidgets-utils.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "gimpcoloroptions.h"
#include "gimppainttool.h"
#include "gimptoolcontrol.h"
#include "tools-utils.h"
#include "gimp-intl.h"
#define HANDLE_SIZE 15
#define STATUSBAR_SIZE 200
static GObject * gimp_paint_tool_constructor (GType type,
guint n_params,
GObjectConstructParam *params);
static void gimp_paint_tool_finalize (GObject *object);
static void gimp_paint_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static void gimp_paint_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_paint_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display);
static void gimp_paint_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_paint_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display);
static void gimp_paint_tool_oper_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display);
static void gimp_paint_tool_draw (GimpDrawTool *draw_tool);
G_DEFINE_TYPE (GimpPaintTool, gimp_paint_tool, GIMP_TYPE_COLOR_TOOL)
#define parent_class gimp_paint_tool_parent_class
static void
gimp_paint_tool_class_init (GimpPaintToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
GimpDrawToolClass *draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
object_class->constructor = gimp_paint_tool_constructor;
object_class->finalize = gimp_paint_tool_finalize;
tool_class->control = gimp_paint_tool_control;
tool_class->button_press = gimp_paint_tool_button_press;
tool_class->button_release = gimp_paint_tool_button_release;
tool_class->motion = gimp_paint_tool_motion;
tool_class->modifier_key = gimp_paint_tool_modifier_key;
tool_class->oper_update = gimp_paint_tool_oper_update;
draw_tool_class->draw = gimp_paint_tool_draw;
}
static void
gimp_paint_tool_init (GimpPaintTool *paint_tool)
{
GimpTool *tool = GIMP_TOOL (paint_tool);
gimp_tool_control_set_motion_mode (tool->control, GIMP_MOTION_MODE_EXACT);
gimp_tool_control_set_scroll_lock (tool->control, TRUE);
gimp_tool_control_set_action_value_1 (tool->control,
"context/context-opacity-set");
paint_tool->pick_colors = FALSE;
paint_tool->draw_line = FALSE;
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 GObject *
gimp_paint_tool_constructor (GType type,
guint n_params,
GObjectConstructParam *params)
{
GObject *object;
GimpTool *tool;
GimpPaintInfo *paint_info;
GimpPaintTool *paint_tool;
object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);
tool = GIMP_TOOL (object);
paint_tool = GIMP_PAINT_TOOL (object);
g_assert (GIMP_IS_TOOL_INFO (tool->tool_info));
g_assert (GIMP_IS_PAINT_INFO (tool->tool_info->paint_info));
paint_info = tool->tool_info->paint_info;
g_assert (g_type_is_a (paint_info->paint_type, GIMP_TYPE_PAINT_CORE));
paint_tool->core = g_object_new (paint_info->paint_type,
"undo-desc", paint_info->blurb,
NULL);
return object;
}
static void
gimp_paint_tool_finalize (GObject *object)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (object);
if (paint_tool->core)
{
g_object_unref (paint_tool->core);
paint_tool->core = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gimp_paint_tool_enable_color_picker:
* @tool: a #GimpPaintTool
* @mode: the #GimpColorPickMode 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
gimp_paint_tool_enable_color_picker (GimpPaintTool *tool,
GimpColorPickMode mode)
{
g_return_if_fail (GIMP_IS_PAINT_TOOL (tool));
tool->pick_colors = TRUE;
GIMP_COLOR_TOOL (tool)->pick_mode = mode;
}
static void
gimp_paint_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpDrawable *drawable = gimp_image_get_active_drawable (display->image);
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
gimp_paint_core_paint (paint_tool->core,
drawable,
GIMP_PAINT_TOOL_GET_OPTIONS (tool),
GIMP_PAINT_STATE_FINISH, 0);
gimp_paint_core_cleanup (paint_tool->core);
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
/**
* gimp_paint_tool_round_line:
* @core: the #GimpPaintCore
* @center_pixels: push coordinates to pixel centers?
* @state: the modifier state
*
* Adjusts core->last_coords and core_cur_coords in preparation to
* drawing a straight line. If @center_pixels is TRUE the endpoints
* get pushed to the center of the pixels. This avoids artefacts
* for e.g. the hard mode. The rounding of the slope to 15 degree
* steps if ctrl is pressed happens, as does rounding the start and
* end coordinates (which may be fractional in high zoom modes) to
* the center of pixels.
**/
static void
gimp_paint_tool_round_line (GimpPaintCore *core,
gboolean center_pixels,
GdkModifierType state)
{
if (center_pixels)
{
core->last_coords.x = floor (core->last_coords.x) + 0.5;
core->last_coords.y = floor (core->last_coords.y) + 0.5;
core->cur_coords.x = floor (core->cur_coords.x ) + 0.5;
core->cur_coords.y = floor (core->cur_coords.y ) + 0.5;
}
/* Restrict to multiples of 15 degrees if ctrl is pressed */
if (state & GDK_CONTROL_MASK)
gimp_tool_motion_constrain (core->last_coords.x, core->last_coords.y,
&core->cur_coords.x, &core->cur_coords.y);
}
static void
gimp_paint_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpPaintOptions *paint_options = GIMP_PAINT_TOOL_GET_OPTIONS (tool);
GimpPaintCore *core = paint_tool->core;
GimpDrawable *drawable;
GdkDisplay *gdk_display;
GimpCoords curr_coords;
gint off_x, off_y;
GError *error = NULL;
if (gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (tool)))
{
GIMP_TOOL_CLASS (parent_class)->button_press (tool, coords, time, state,
display);
return;
}
drawable = gimp_image_get_active_drawable (display->image);
curr_coords = *coords;
gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);
curr_coords.x -= off_x;
curr_coords.y -= off_y;
if (gimp_draw_tool_is_active (draw_tool))
gimp_draw_tool_stop (draw_tool);
if (tool->display &&
tool->display != display &&
tool->display->image == 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;
}
gdk_display = gtk_widget_get_display (display->shell);
core->use_pressure = (gimp_devices_get_current (display->image->gimp) !=
gdk_display_get_core_pointer (gdk_display));
if (! gimp_paint_core_start (core, drawable, paint_options, &curr_coords,
&error))
{
gimp_tool_message (tool, display, error->message);
g_clear_error (&error);
return;
}
if ((display != tool->display) || ! paint_tool->draw_line)
{
/* if this is a new image, reinit the core vals */
core->start_coords = core->cur_coords;
core->last_coords = core->cur_coords;
core->distance = 0.0;
core->pixel_dist = 0.0;
}
else if (paint_tool->draw_line)
{
/* If shift is down and this is not the first paint
* stroke, then draw a line from the last coords to the pointer
*/
gboolean hard;
hard = (gimp_paint_options_get_brush_mode (paint_options) ==
GIMP_BRUSH_HARD);
core->start_coords = core->last_coords;
core->use_pressure = FALSE;
gimp_paint_tool_round_line (core, hard, state);
}
/* chain up to activate the tool */
GIMP_TOOL_CLASS (parent_class)->button_press (tool, coords, time, state,
display);
/* pause the current selection */
gimp_image_selection_control (display->image, GIMP_SELECTION_PAUSE);
/* Let the specific painting function initialize itself */
gimp_paint_core_paint (core, drawable, paint_options,
GIMP_PAINT_STATE_INIT, time);
/* Paint to the image */
if (paint_tool->draw_line)
{
gimp_paint_core_interpolate (core, drawable, paint_options, time);
}
else
{
gimp_paint_core_paint (core, drawable, paint_options,
GIMP_PAINT_STATE_MOTION, time);
}
gimp_projection_flush_now (display->image->projection);
gimp_display_flush_now (display);
gimp_draw_tool_start (draw_tool, display);
}
static void
gimp_paint_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpPaintOptions *paint_options = GIMP_PAINT_TOOL_GET_OPTIONS (tool);
GimpPaintCore *core = paint_tool->core;
GimpDrawable *drawable;
if (gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (tool)))
{
GIMP_TOOL_CLASS (parent_class)->button_release (tool, coords, time,
state, release_type,
display);
return;
}
drawable = gimp_image_get_active_drawable (display->image);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
/* Let the specific painting function finish up */
gimp_paint_core_paint (core, drawable, paint_options,
GIMP_PAINT_STATE_FINISH, time);
/* resume the current selection */
gimp_image_selection_control (display->image, GIMP_SELECTION_RESUME);
/* chain up to halt the tool */
GIMP_TOOL_CLASS (parent_class)->button_release (tool, coords, time, state,
release_type, display);
if (release_type == GIMP_BUTTON_RELEASE_CANCEL)
gimp_paint_core_cancel (core, drawable);
else
gimp_paint_core_finish (core, drawable);
gimp_image_flush (display->image);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
static void
gimp_paint_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpPaintOptions *paint_options = GIMP_PAINT_TOOL_GET_OPTIONS (tool);
GimpPaintCore *core = paint_tool->core;
GimpDrawable *drawable;
gint off_x, off_y;
if (gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (tool)))
{
GIMP_TOOL_CLASS (parent_class)->motion (tool, coords, time, state,
display);
return;
}
drawable = gimp_image_get_active_drawable (display->image);
core->cur_coords = *coords;
gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);
core->cur_coords.x -= off_x;
core->cur_coords.y -= off_y;
GIMP_TOOL_CLASS (parent_class)->motion (tool, coords, time, state,
display);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
gimp_paint_core_interpolate (core, drawable, paint_options, time);
gimp_projection_flush_now (display->image->projection);
gimp_display_flush_now (display);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
static void
gimp_paint_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
if (key != GDK_CONTROL_MASK)
return;
if (paint_tool->pick_colors && ! paint_tool->draw_line)
{
if (press)
{
GimpToolInfo *info = gimp_get_tool_info (display->image->gimp,
"gimp-color-picker-tool");
if (GIMP_IS_TOOL_INFO (info))
{
if (gimp_draw_tool_is_active (draw_tool))
gimp_draw_tool_stop (draw_tool);
gimp_color_tool_enable (GIMP_COLOR_TOOL (tool),
GIMP_COLOR_OPTIONS (info->tool_options));
switch (GIMP_COLOR_TOOL (tool)->pick_mode)
{
case GIMP_COLOR_PICK_MODE_FOREGROUND:
gimp_tool_push_status (tool, display,
_("Click in any image to pick the "
"foreground color"));
break;
case GIMP_COLOR_PICK_MODE_BACKGROUND:
gimp_tool_push_status (tool, display,
_("Click in any image to pick the "
"background color"));
break;
default:
break;
}
}
}
else
{
if (gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (tool)))
{
gimp_tool_pop_status (tool, display);
gimp_color_tool_disable (GIMP_COLOR_TOOL (tool));
}
}
}
}
static void
gimp_paint_tool_oper_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display)
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (tool);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpPaintOptions *paint_options = GIMP_PAINT_TOOL_GET_OPTIONS (tool);
GimpPaintCore *core = paint_tool->core;
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (display->shell);
GimpDrawable *drawable;
if (gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (tool)))
{
GIMP_TOOL_CLASS (parent_class)->oper_update (tool, coords, state,
proximity, display);
return;
}
if (gimp_draw_tool_is_active (draw_tool))
gimp_draw_tool_stop (draw_tool);
gimp_tool_pop_status (tool, display);
if (tool->display &&
tool->display != display &&
tool->display->image == 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;
}
drawable = gimp_image_get_active_drawable (display->image);
if (drawable && proximity)
{
if (display == tool->display && (state & GDK_SHIFT_MASK))
{
/* If shift is down and this is not the first paint stroke,
* draw a line.
*/
gchar *status_help;
gdouble dx, dy, dist;
gint off_x, off_y;
gboolean hard;
core->cur_coords = *coords;
gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);
core->cur_coords.x -= off_x;
core->cur_coords.y -= off_y;
hard = (gimp_paint_options_get_brush_mode (paint_options) ==
GIMP_BRUSH_HARD);
gimp_paint_tool_round_line (core, hard, state);
dx = core->cur_coords.x - core->last_coords.x;
dy = core->cur_coords.y - core->last_coords.y;
status_help = gimp_suggest_modifiers (paint_tool->status_line,
GDK_CONTROL_MASK & ~state,
NULL,
_("%s for constrained angles"),
NULL);
/* show distance in statusbar */
if (shell->unit == GIMP_UNIT_PIXEL)
{
dist = sqrt (SQR (dx) + SQR (dy));
gimp_tool_push_status (tool, display, "%.1f %s. %s",
dist, _("pixels"), status_help);
}
else
{
GimpImage *image = display->image;
gchar format_str[64];
g_snprintf (format_str, sizeof (format_str), "%%.%df %s. %%s",
_gimp_unit_get_digits (image->gimp, shell->unit),
_gimp_unit_get_symbol (image->gimp, shell->unit));
dist = (_gimp_unit_get_factor (image->gimp, shell->unit) *
sqrt (SQR (dx / image->xresolution) +
SQR (dy / image->yresolution)));
gimp_tool_push_status (tool, display, format_str,
dist, status_help);
}
g_free (status_help);
paint_tool->draw_line = TRUE;
}
else
{
gchar *status;
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
* gimp_suggest_modifiers() would interpret this parameter.
*/
if (paint_tool->status_ctrl != NULL)
modifiers |= GDK_CONTROL_MASK;
/* suggest drawing lines only after the first point is set
*/
if (display == tool->display)
modifiers |= GDK_SHIFT_MASK;
status = gimp_suggest_modifiers (paint_tool->status,
modifiers & ~state,
_("%s for a straight line"),
paint_tool->status_ctrl,
NULL);
gimp_tool_push_status (tool, display, status);
g_free (status);
paint_tool->draw_line = FALSE;
}
gimp_draw_tool_start (draw_tool, display);
}
GIMP_TOOL_CLASS (parent_class)->oper_update (tool, coords, state, proximity,
display);
}
static void
gimp_paint_tool_draw (GimpDrawTool *draw_tool)
{
if (! gimp_color_tool_is_enabled (GIMP_COLOR_TOOL (draw_tool)))
{
GimpPaintTool *paint_tool = GIMP_PAINT_TOOL (draw_tool);
GimpPaintCore *core = paint_tool->core;
if (paint_tool->draw_line &&
! gimp_tool_control_is_active (GIMP_TOOL (draw_tool)->control))
{
/* Draw start target */
gimp_draw_tool_draw_handle (draw_tool,
GIMP_HANDLE_CROSS,
core->last_coords.x,
core->last_coords.y,
HANDLE_SIZE,
HANDLE_SIZE,
GTK_ANCHOR_CENTER,
TRUE);
/* Draw end target */
gimp_draw_tool_draw_handle (draw_tool,
GIMP_HANDLE_CROSS,
core->cur_coords.x,
core->cur_coords.y,
HANDLE_SIZE,
HANDLE_SIZE,
GTK_ANCHOR_CENTER,
TRUE);
/* Draw the line between the start and end coords */
gimp_draw_tool_draw_line (draw_tool,
core->last_coords.x,
core->last_coords.y,
core->cur_coords.x,
core->cur_coords.y,
TRUE);
}
}
GIMP_DRAW_TOOL_CLASS (parent_class)->draw (draw_tool);
}
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