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