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gimp/app/text/gimpfont.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpfont.c
* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
* Sven Neumann <sven@gimp.org>
*
* 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 <glib-object.h>
#include <pango/pangoft2.h>
#include "text-types.h"
#include "base/temp-buf.h"
#include "gimpfont.h"
#include "gimp-intl.h"
/* This is a so-called pangram; it's supposed to
contain all characters found in the alphabet. */
#define GIMP_TEXT_PANGRAM N_("Pack my box with\nfive dozen liquor jugs.")
#define GIMP_FONT_POPUP_SIZE (PANGO_SCALE * 30)
enum
{
PROP_0,
PROP_PANGO_CONTEXT
};
struct _GimpFont
{
GimpViewable parent_instance;
PangoContext *pango_context;
PangoLayout *popup_layout;
gint popup_width;
gint popup_height;
};
struct _GimpFontClass
{
GimpViewableClass parent_class;
};
static void gimp_font_finalize (GObject *object);
static void gimp_font_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_font_get_preview_size (GimpViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height);
static gboolean gimp_font_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height);
static TempBuf * gimp_font_get_new_preview (GimpViewable *viewable,
gint width,
gint height);
G_DEFINE_TYPE (GimpFont, gimp_font, GIMP_TYPE_VIEWABLE);
#define parent_class gimp_font_parent_class
static void
gimp_font_class_init (GimpFontClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
object_class->finalize = gimp_font_finalize;
object_class->set_property = gimp_font_set_property;
viewable_class->get_preview_size = gimp_font_get_preview_size;
viewable_class->get_popup_size = gimp_font_get_popup_size;
viewable_class->get_new_preview = gimp_font_get_new_preview;
viewable_class->default_stock_id = "gtk-select-font";
g_object_class_install_property (object_class, PROP_PANGO_CONTEXT,
g_param_spec_object ("pango-context",
NULL, NULL,
PANGO_TYPE_CONTEXT,
G_PARAM_WRITABLE));
}
static void
gimp_font_init (GimpFont *font)
{
font->pango_context = NULL;
}
static void
gimp_font_finalize (GObject *object)
{
GimpFont *font = GIMP_FONT (object);
if (font->pango_context)
{
g_object_unref (font->pango_context);
font->pango_context = NULL;
}
if (font->popup_layout)
{
g_object_unref (font->popup_layout);
font->popup_layout = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_font_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpFont *font = GIMP_FONT (object);
switch (property_id)
{
case PROP_PANGO_CONTEXT:
if (font->pango_context)
g_object_unref (font->pango_context);
font->pango_context = (PangoContext *) g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_font_get_preview_size (GimpViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
*width = size;
*height = size;
}
static gboolean
gimp_font_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
GimpFont *font = GIMP_FONT (viewable);
PangoFontDescription *font_desc;
PangoRectangle ink;
PangoRectangle logical;
const gchar *name;
if (! font->pango_context)
return FALSE;
name = gimp_object_get_name (GIMP_OBJECT (font));
font_desc = pango_font_description_from_string (name);
g_return_val_if_fail (font_desc != NULL, FALSE);
pango_font_description_set_size (font_desc, GIMP_FONT_POPUP_SIZE);
if (font->popup_layout)
g_object_unref (font->popup_layout);
font->popup_layout = pango_layout_new (font->pango_context);
pango_layout_set_font_description (font->popup_layout, font_desc);
pango_font_description_free (font_desc);
pango_layout_set_text (font->popup_layout, gettext (GIMP_TEXT_PANGRAM), -1);
pango_layout_get_pixel_extents (font->popup_layout, &ink, &logical);
*popup_width = MAX (ink.width, logical.width) + 6;
*popup_height = MAX (ink.height, logical.height) + 6;
font->popup_width = *popup_width;
font->popup_height = *popup_height;
return TRUE;
}
static TempBuf *
gimp_font_get_new_preview (GimpViewable *viewable,
gint width,
gint height)
{
GimpFont *font = GIMP_FONT (viewable);
PangoLayout *layout;
PangoRectangle ink;
PangoRectangle logical;
gint layout_width;
gint layout_height;
gint layout_x;
gint layout_y;
TempBuf *temp_buf;
FT_Bitmap bitmap;
guchar *p;
guchar black = 0;
if (! font->pango_context)
return NULL;
if (! font->popup_layout ||
font->popup_width != width ||
font->popup_height != height)
{
PangoFontDescription *font_desc;
const gchar *name;
name = gimp_object_get_name (GIMP_OBJECT (font));
font_desc = pango_font_description_from_string (name);
g_return_val_if_fail (font_desc != NULL, NULL);
pango_font_description_set_size (font_desc,
PANGO_SCALE * height * 2.0 / 3.0);
layout = pango_layout_new (font->pango_context);
pango_layout_set_font_description (layout, font_desc);
pango_font_description_free (font_desc);
pango_layout_set_text (layout, "Aa", -1);
}
else
{
layout = g_object_ref (font->popup_layout);
}
temp_buf = temp_buf_new (width, height, 1, 0, 0, &black);
bitmap.width = temp_buf->width;
bitmap.rows = temp_buf->height;
bitmap.pitch = temp_buf->width;
bitmap.buffer = temp_buf_data (temp_buf);
pango_layout_get_pixel_extents (layout, &ink, &logical);
layout_width = MAX (ink.width, logical.width);
layout_height = MAX (ink.height, logical.height);
layout_x = (bitmap.width - layout_width) / 2;
layout_y = (bitmap.rows - layout_height) / 2;
if (ink.x < logical.x)
layout_x += logical.x - ink.x;
if (ink.y < logical.y)
layout_y += logical.y - ink.y;
pango_ft2_render_layout (&bitmap, layout, layout_x, layout_y);
g_object_unref (layout);
p = temp_buf_data (temp_buf);
for (height = temp_buf->height; height; height--)
for (width = temp_buf->width; width; width--, p++)
*p = 255 - *p;
return temp_buf;
}
GimpFont *
gimp_font_get_standard (void)
{
static GimpFont *standard_font = NULL;
if (! standard_font)
standard_font = g_object_new (GIMP_TYPE_FONT,
"name", "Sans",
NULL);
return standard_font;
}
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