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gimp/app/text/gimptextlayout.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpText
* Copyright (C) 2002-2003 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 "core/gimpimage.h"
#include "core/gimpunit.h"
#include "gimptext.h"
#include "gimptext-private.h"
#include "gimptextlayout.h"
static void gimp_text_layout_finalize (GObject *object);
static void gimp_text_layout_position (GimpTextLayout *layout);
static PangoContext * gimp_text_get_pango_context (GimpText *text,
gdouble xres,
gdouble yres);
static gint gimp_text_layout_pixel_size (Gimp *gimp,
gdouble value,
GimpUnit unit,
gdouble res);
static gint gimp_text_layout_point_size (Gimp *gimp,
gdouble value,
GimpUnit unit,
gdouble res);
G_DEFINE_TYPE (GimpTextLayout, gimp_text_layout, G_TYPE_OBJECT)
#define parent_class gimp_text_layout_parent_class
static void
gimp_text_layout_class_init (GimpTextLayoutClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gimp_text_layout_finalize;
}
static void
gimp_text_layout_init (GimpTextLayout *layout)
{
layout->text = NULL;
layout->layout = NULL;
}
static void
gimp_text_layout_finalize (GObject *object)
{
GimpTextLayout *layout = GIMP_TEXT_LAYOUT (object);
if (layout->text)
{
g_object_unref (layout->text);
layout->text = NULL;
}
if (layout->layout)
{
g_object_unref (layout->layout);
layout->layout = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
GimpTextLayout *
gimp_text_layout_new (GimpText *text,
GimpImage *image)
{
GimpTextLayout *layout;
PangoContext *context;
PangoFontDescription *font_desc;
PangoAlignment alignment = PANGO_ALIGN_LEFT;
gdouble xres, yres;
gint size;
g_return_val_if_fail (GIMP_IS_TEXT (text), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
font_desc = pango_font_description_from_string (text->font);
g_return_val_if_fail (font_desc != NULL, NULL);
gimp_image_get_resolution (image, &xres, &yres);
size = gimp_text_layout_point_size (image->gimp,
text->font_size,
text->unit,
yres);
pango_font_description_set_size (font_desc, MAX (1, size));
context = gimp_text_get_pango_context (text, xres, yres);
layout = g_object_new (GIMP_TYPE_TEXT_LAYOUT, NULL);
layout->text = g_object_ref (text);
layout->layout = pango_layout_new (context);
g_object_unref (context);
pango_layout_set_font_description (layout->layout, font_desc);
pango_font_description_free (font_desc);
if (text->text)
pango_layout_set_text (layout->layout, text->text, -1);
else
pango_layout_set_text (layout->layout, NULL, 0);
switch (text->justify)
{
case GIMP_TEXT_JUSTIFY_LEFT:
alignment = PANGO_ALIGN_LEFT;
break;
case GIMP_TEXT_JUSTIFY_RIGHT:
alignment = PANGO_ALIGN_RIGHT;
break;
case GIMP_TEXT_JUSTIFY_CENTER:
alignment = PANGO_ALIGN_CENTER;
break;
case GIMP_TEXT_JUSTIFY_FILL:
/* FIXME: This doesn't work since the implementation is missing
at the Pango level.
*/
alignment = PANGO_ALIGN_LEFT;
pango_layout_set_justify (layout->layout, TRUE);
break;
}
pango_layout_set_alignment (layout->layout, alignment);
switch (text->box_mode)
{
case GIMP_TEXT_BOX_DYNAMIC:
break;
case GIMP_TEXT_BOX_FIXED:
pango_layout_set_width (layout->layout,
gimp_text_layout_pixel_size (image->gimp,
text->box_width,
text->box_unit,
xres));
break;
}
pango_layout_set_indent (layout->layout,
gimp_text_layout_pixel_size (image->gimp,
text->indent,
text->unit,
xres));
pango_layout_set_spacing (layout->layout,
gimp_text_layout_pixel_size (image->gimp,
text->line_spacing,
text->unit,
yres));
if (fabs (text->letter_spacing) > 0.1)
{
PangoAttrList *attrs = pango_attr_list_new ();
PangoAttribute *attr;
attr = pango_attr_letter_spacing_new (text->letter_spacing * PANGO_SCALE);
attr->start_index = 0;
attr->end_index = -1;
pango_attr_list_insert (attrs, attr);
pango_layout_set_attributes (layout->layout, attrs);
pango_attr_list_unref (attrs);
}
gimp_text_layout_position (layout);
switch (text->box_mode)
{
case GIMP_TEXT_BOX_DYNAMIC:
break;
case GIMP_TEXT_BOX_FIXED:
layout->extents.height =
PANGO_PIXELS (gimp_text_layout_pixel_size (image->gimp,
text->box_height,
text->box_unit,
yres));
break;
}
return layout;
}
gboolean
gimp_text_layout_get_size (GimpTextLayout *layout,
gint *width,
gint *height)
{
g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), FALSE);
if (width)
*width = layout->extents.width;
if (height)
*height = layout->extents.height;
return (layout->extents.width > 0 && layout->extents.height > 0);
}
void
gimp_text_layout_get_offsets (GimpTextLayout *layout,
gint *x,
gint *y)
{
g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
if (x)
*x = layout->extents.x;
if (y)
*y = layout->extents.y;
}
static void
gimp_text_layout_position (GimpTextLayout *layout)
{
PangoRectangle ink;
PangoRectangle logical;
gint x1, y1;
gint x2, y2;
layout->extents.x = 0;
layout->extents.x = 0;
layout->extents.width = 0;
layout->extents.height = 0;
pango_layout_get_pixel_extents (layout->layout, &ink, &logical);
#ifdef VERBOSE
g_print ("ink rect: %d x %d @ %d, %d\n",
ink.width, ink.height, ink.x, ink.y);
g_print ("logical rect: %d x %d @ %d, %d\n",
logical.width, logical.height, logical.x, logical.y);
#endif
if (ink.width < 1 || ink.height < 1)
return;
x1 = MIN (ink.x, logical.x);
y1 = MIN (ink.y, logical.y);
x2 = MAX (ink.x + ink.width, logical.x + logical.width);
y2 = MAX (ink.y + ink.height, logical.y + logical.height);
layout->extents.x = - x1;
layout->extents.y = - y1;
layout->extents.width = x2 - x1;
layout->extents.height = y2 - y1;
if (layout->text->border > 0)
{
gint border = layout->text->border;
layout->extents.x += border;
layout->extents.y += border;
layout->extents.width += 2 * border;
layout->extents.height += 2 * border;
}
#ifdef VERBOSE
g_print ("layout extents: %d x %d @ %d, %d\n",
layout->extents.width, layout->extents.height,
layout->extents.x, layout->extents.y);
#endif
}
static void
gimp_text_ft2_subst_func (FcPattern *pattern,
gpointer data)
{
GimpText *text = GIMP_TEXT (data);
FcPatternAddBool (pattern, FC_HINTING, text->hinting);
FcPatternAddBool (pattern, FC_AUTOHINT, text->autohint);
FcPatternAddBool (pattern, FC_ANTIALIAS, text->antialias);
}
static PangoContext *
gimp_text_get_pango_context (GimpText *text,
gdouble xres,
gdouble yres)
{
PangoContext *context;
PangoFT2FontMap *fontmap;
fontmap = PANGO_FT2_FONT_MAP (pango_ft2_font_map_new ());
pango_ft2_font_map_set_resolution (fontmap, xres, yres);
pango_ft2_font_map_set_default_substitute (fontmap,
gimp_text_ft2_subst_func,
g_object_ref (text),
(GDestroyNotify) g_object_unref);
context = pango_ft2_font_map_create_context (fontmap);
g_object_unref (fontmap);
/* Workaround for bug #143542 (PangoFT2Fontmap leak),
* see also bug #148997 (Text layer rendering leaks font file descriptor):
*
* Calling pango_ft2_font_map_substitute_changed() causes the
* font_map cache to be flushed, thereby removing the circular
* reference that causes the leak.
*/
g_object_weak_ref (G_OBJECT (context),
(GWeakNotify) pango_ft2_font_map_substitute_changed,
fontmap);
if (text->language)
pango_context_set_language (context,
pango_language_from_string (text->language));
switch (text->base_dir)
{
case GIMP_TEXT_DIRECTION_LTR:
pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);
break;
case GIMP_TEXT_DIRECTION_RTL:
pango_context_set_base_dir (context, PANGO_DIRECTION_RTL);
break;
}
return context;
}
static gint
gimp_text_layout_pixel_size (Gimp *gimp,
gdouble value,
GimpUnit unit,
gdouble res)
{
gdouble factor;
switch (unit)
{
case GIMP_UNIT_PIXEL:
return PANGO_SCALE * value;
default:
factor = _gimp_unit_get_factor (gimp, unit);
g_return_val_if_fail (factor > 0.0, 0);
return PANGO_SCALE * value * res / factor;
}
}
static gint
gimp_text_layout_point_size (Gimp *gimp,
gdouble value,
GimpUnit unit,
gdouble res)
{
gdouble factor;
switch (unit)
{
case GIMP_UNIT_POINT:
return PANGO_SCALE * value;
case GIMP_UNIT_PIXEL:
g_return_val_if_fail (res > 0.0, 0);
return (PANGO_SCALE * value *
_gimp_unit_get_factor (gimp, GIMP_UNIT_POINT) / res);
default:
factor = _gimp_unit_get_factor (gimp, unit);
g_return_val_if_fail (factor > 0.0, 0);
return (PANGO_SCALE * value *
_gimp_unit_get_factor (gimp, GIMP_UNIT_POINT) / factor);
}
}
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