PIKApp/app/display/pikacanvastext.c

275 lines
8.7 KiB
C

/* 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
*
* pikacanvastext.c
* Copyright (C) 2023 mr.fantastic <mrfantastic@firemail.cc>
*
* 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 "display-types.h"
#include "pikacanvastext.h"
#include "pikadisplayshell.h"
enum
{
PROP_0,
PROP_X,
PROP_Y,
PROP_FONT_SIZE,
PROP_TEXT
};
typedef struct _PikaCanvasTextPrivate PikaCanvasTextPrivate;
struct _PikaCanvasTextPrivate
{
gdouble x;
gdouble y;
gdouble font_size;
gchar *text;
};
#define GET_PRIVATE(text_item) \
((PikaCanvasTextPrivate *) pika_canvas_text_get_instance_private ((PikaCanvasText *) (text_item)))
/* local function prototypes */
static void pika_canvas_text_finalize (GObject *object);
static void pika_canvas_text_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_text_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_canvas_text_draw (PikaCanvasItem *item,
cairo_t *cr);
static cairo_region_t * pika_canvas_text_get_extents (PikaCanvasItem *item);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasText, pika_canvas_text,
PIKA_TYPE_CANVAS_ITEM)
#define parent_class pika_canvas_text_parent_class
static void
pika_canvas_text_class_init (PikaCanvasTextClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->finalize = pika_canvas_text_finalize;
object_class->set_property = pika_canvas_text_set_property;
object_class->get_property = pika_canvas_text_get_property;
item_class->draw = pika_canvas_text_draw;
item_class->get_extents = pika_canvas_text_get_extents;
g_object_class_install_property (object_class, PROP_X,
g_param_spec_double ("x", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_Y,
g_param_spec_double ("y", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_FONT_SIZE,
g_param_spec_double ("font-size", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_TEXT,
g_param_spec_string ("text", NULL, NULL,
NULL,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_text_init (PikaCanvasText *text)
{
}
static void
pika_canvas_text_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasTextPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_X:
private->x = g_value_get_double (value);
break;
case PROP_Y:
private->y = g_value_get_double (value);
break;
case PROP_FONT_SIZE:
private->font_size = g_value_get_double (value);
break;
case PROP_TEXT:
private->text = (gchar *) g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_text_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasTextPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_X:
g_value_set_double (value, private->x);
break;
case PROP_Y:
g_value_set_double (value, private->y);
break;
case PROP_FONT_SIZE:
g_value_set_double (value, private->font_size);
break;
case PROP_TEXT:
g_value_set_string (value, private->text);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_text_transform (PikaCanvasItem *item,
gdouble *x1,
gdouble *y1,
gdouble *x2,
gdouble *y2)
{
PikaCanvasTextPrivate *private = GET_PRIVATE (item);
cairo_text_extents_t extents;
cairo_surface_t *dummy_surface;
cairo_t *cr;
pika_canvas_item_transform_xy_f (item,
private->x, private->y,
x1, y1);
dummy_surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 0, 0);
cr = cairo_create (dummy_surface);
cairo_set_font_size (cr, private->font_size);
cairo_text_extents (cr, private->text, &extents);
cairo_surface_destroy (dummy_surface);
cairo_destroy (cr);
*x1 = floor (*x1) + 0.5;
*y1 = floor (*y1) + 0.5;
*x2 = extents.width;
*y2 = extents.height;
}
static void
pika_canvas_text_draw (PikaCanvasItem *item,
cairo_t *cr)
{
gdouble x, y, ignore_x2, ignore_y2;
PikaCanvasTextPrivate *private = GET_PRIVATE (item);
pika_canvas_text_transform (item, &x, &y, &ignore_x2, &ignore_y2);
cairo_set_font_size (cr, private->font_size);
cairo_move_to (cr, x,y);
cairo_text_path (cr, private->text);
_pika_canvas_item_fill (item, cr);
}
static cairo_region_t *
pika_canvas_text_get_extents (PikaCanvasItem *item)
{
cairo_rectangle_int_t rectangle;
gdouble x1, y1, x2, y2;
pika_canvas_text_transform (item, &x1, &y1, &x2, &y2);
rectangle.x = (gint) x1-1;
rectangle.y = (gint) (y1-y2-1);
rectangle.width = (gint) x2+3;
rectangle.height = (gint) y2+3;
return cairo_region_create_rectangle (&rectangle);
}
PikaCanvasItem *
pika_canvas_text_new (PikaDisplayShell *shell,
gdouble x,
gdouble y,
gdouble font_size,
gchar *text)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (PIKA_TYPE_CANVAS_TEXT,
"shell", shell,
"x", x,
"y", y,
"font-size", font_size,
"text", text,
NULL);
}
static void
pika_canvas_text_finalize (GObject *object)
{
PikaCanvasTextPrivate *private = GET_PRIVATE (object);
g_free (private->text);
G_OBJECT_CLASS (parent_class)->finalize (object);
}