mirror of https://github.com/GNOME/gimp.git
408 lines
12 KiB
C
408 lines
12 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* GimpText
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* Copyright (C) 2002-2003 Sven Neumann <sven@gimp.org>
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include <pango/pangoft2.h>
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#include "text-types.h"
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#include "core/gimpimage.h"
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#include "core/gimpunit.h"
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#include "gimptext.h"
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#include "gimptext-private.h"
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#include "gimptextlayout.h"
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static void gimp_text_layout_class_init (GimpTextLayoutClass *klass);
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static void gimp_text_layout_init (GimpTextLayout *layout);
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static void gimp_text_layout_finalize (GObject *object);
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static void gimp_text_layout_position (GimpTextLayout *layout);
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static PangoContext * gimp_text_get_pango_context (GimpText *text,
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gdouble xres,
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gdouble yres);
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static gint gimp_text_layout_pixel_size (Gimp *gimp,
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gdouble value,
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GimpUnit unit,
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gdouble res);
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static gint gimp_text_layout_point_size (Gimp *gimp,
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gdouble value,
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GimpUnit unit,
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gdouble res);
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static GObjectClass * parent_class = NULL;
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GType
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gimp_text_layout_get_type (void)
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{
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static GType layout_type = 0;
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if (! layout_type)
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{
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static const GTypeInfo layout_info =
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{
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sizeof (GimpTextLayoutClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gimp_text_layout_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpTextLayout),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_text_layout_init,
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};
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layout_type = g_type_register_static (G_TYPE_OBJECT,
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"GimpTextLayout",
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&layout_info, 0);
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}
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return layout_type;
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}
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static void
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gimp_text_layout_class_init (GimpTextLayoutClass *klass)
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{
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GObjectClass *object_class;
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object_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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object_class->finalize = gimp_text_layout_finalize;
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}
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static void
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gimp_text_layout_init (GimpTextLayout *layout)
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{
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layout->text = NULL;
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layout->layout = NULL;
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}
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static void
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gimp_text_layout_finalize (GObject *object)
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{
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GimpTextLayout *layout;
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layout = GIMP_TEXT_LAYOUT (object);
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if (layout->text)
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{
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g_object_unref (layout->text);
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layout->text = NULL;
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}
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if (layout->layout)
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{
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g_object_unref (layout->layout);
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layout->layout = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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GimpTextLayout *
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gimp_text_layout_new (GimpText *text,
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GimpImage *image)
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{
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GimpTextLayout *layout;
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PangoContext *context;
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PangoFontDescription *font_desc;
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PangoAlignment alignment = PANGO_ALIGN_LEFT;
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gdouble xres, yres;
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gint size;
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g_return_val_if_fail (GIMP_IS_TEXT (text), NULL);
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g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
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font_desc = pango_font_description_from_string (text->font);
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g_return_val_if_fail (font_desc != NULL, NULL);
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if (!font_desc)
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return NULL;
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gimp_image_get_resolution (image, &xres, &yres);
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size = gimp_text_layout_point_size (image->gimp,
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text->font_size,
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text->unit,
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yres);
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pango_font_description_set_size (font_desc, MAX (1, size));
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context = gimp_text_get_pango_context (text, xres, yres);
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layout = g_object_new (GIMP_TYPE_TEXT_LAYOUT, NULL);
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layout->text = g_object_ref (text);
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layout->layout = pango_layout_new (context);
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g_object_unref (context);
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pango_layout_set_font_description (layout->layout, font_desc);
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pango_font_description_free (font_desc);
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pango_layout_set_text (layout->layout, text->text, -1);
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switch (text->justify)
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{
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case GIMP_TEXT_JUSTIFY_LEFT:
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alignment = PANGO_ALIGN_LEFT;
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break;
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case GIMP_TEXT_JUSTIFY_RIGHT:
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alignment = PANGO_ALIGN_RIGHT;
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break;
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case GIMP_TEXT_JUSTIFY_CENTER:
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alignment = PANGO_ALIGN_CENTER;
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break;
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case GIMP_TEXT_JUSTIFY_FILL:
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/* FIXME: This doesn't work since the implementation is missing
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at the Pango level.
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*/
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alignment = PANGO_ALIGN_LEFT;
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pango_layout_set_justify (layout->layout, TRUE);
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break;
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}
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pango_layout_set_alignment (layout->layout, alignment);
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switch (text->box_mode)
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{
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case GIMP_TEXT_BOX_DYNAMIC:
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break;
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case GIMP_TEXT_BOX_FIXED:
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pango_layout_set_width (layout->layout,
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gimp_text_layout_pixel_size (image->gimp,
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text->box_width,
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text->box_unit,
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xres));
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break;
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}
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pango_layout_set_indent (layout->layout,
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gimp_text_layout_pixel_size (image->gimp,
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text->indent,
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text->unit,
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xres));
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pango_layout_set_spacing (layout->layout,
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gimp_text_layout_pixel_size (image->gimp,
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text->line_spacing,
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text->unit,
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yres));
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gimp_text_layout_position (layout);
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switch (text->box_mode)
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{
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case GIMP_TEXT_BOX_DYNAMIC:
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break;
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case GIMP_TEXT_BOX_FIXED:
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layout->extents.height =
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PANGO_PIXELS (gimp_text_layout_pixel_size (image->gimp,
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text->box_height,
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text->box_unit,
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yres));
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break;
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}
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return layout;
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}
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gboolean
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gimp_text_layout_get_size (GimpTextLayout *layout,
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gint *width,
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gint *height)
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{
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g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), FALSE);
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if (width)
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*width = layout->extents.width;
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if (height)
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*height = layout->extents.height;
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return (layout->extents.width > 0 && layout->extents.height > 0);
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}
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void
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gimp_text_layout_get_offsets (GimpTextLayout *layout,
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gint *x,
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gint *y)
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{
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (x)
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*x = layout->extents.x;
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if (y)
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*y = layout->extents.y;
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}
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static void
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gimp_text_layout_position (GimpTextLayout *layout)
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{
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PangoRectangle ink;
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PangoRectangle logical;
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gint x1, y1;
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gint x2, y2;
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layout->extents.x = 0;
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layout->extents.x = 0;
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layout->extents.width = 0;
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layout->extents.height = 0;
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pango_layout_get_pixel_extents (layout->layout, &ink, &logical);
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#ifdef VERBOSE
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g_print ("ink rect: %d x %d @ %d, %d\n",
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ink.width, ink.height, ink.x, ink.y);
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g_print ("logical rect: %d x %d @ %d, %d\n",
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logical.width, logical.height, logical.x, logical.y);
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#endif
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if (ink.width < 1 || ink.height < 1)
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return;
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x1 = MIN (0, logical.x);
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y1 = MIN (0, logical.y);
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x2 = MAX (ink.x + ink.width, logical.x + logical.width);
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y2 = MAX (ink.y + ink.height, logical.y + logical.height);
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layout->extents.width = x2 - x1;
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layout->extents.height = y2 - y1;
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if (layout->text->border > 0)
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{
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gint border = layout->text->border;
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layout->extents.x += border;
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layout->extents.y += border;
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layout->extents.width += 2 * border;
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layout->extents.height += 2 * border;
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}
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#ifdef VERBOSE
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g_print ("layout extents: %d x %d @ %d, %d\n",
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layout->extents.width, layout->extents.height,
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layout->extents.x, layout->extents.y);
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#endif
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}
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static void
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gimp_text_ft2_subst_func (FcPattern *pattern,
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gpointer data)
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{
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GimpText *text = GIMP_TEXT (data);
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FcPatternAddBool (pattern, FC_HINTING, text->hinting);
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FcPatternAddBool (pattern, FC_AUTOHINT, text->autohint);
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FcPatternAddBool (pattern, FC_ANTIALIAS, text->antialias);
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}
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static PangoContext *
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gimp_text_get_pango_context (GimpText *text,
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gdouble xres,
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gdouble yres)
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{
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PangoContext *context;
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PangoFT2FontMap *fontmap;
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fontmap = PANGO_FT2_FONT_MAP (pango_ft2_font_map_new ());
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pango_ft2_font_map_set_resolution (fontmap, xres, yres);
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pango_ft2_font_map_set_default_substitute (fontmap,
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gimp_text_ft2_subst_func,
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g_object_ref (text),
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(GDestroyNotify) g_object_unref);
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context = pango_ft2_font_map_create_context (fontmap);
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g_object_unref (fontmap);
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if (text->language)
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pango_context_set_language (context,
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pango_language_from_string (text->language));
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switch (text->base_dir)
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{
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case GIMP_TEXT_DIRECTION_LTR:
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pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);
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break;
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case GIMP_TEXT_DIRECTION_RTL:
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pango_context_set_base_dir (context, PANGO_DIRECTION_RTL);
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break;
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}
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return context;
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}
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static gint
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gimp_text_layout_pixel_size (Gimp *gimp,
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gdouble value,
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GimpUnit unit,
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gdouble res)
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{
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gdouble factor;
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switch (unit)
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{
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case GIMP_UNIT_PIXEL:
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return PANGO_SCALE * value;
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default:
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factor = _gimp_unit_get_factor (gimp, unit);
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g_return_val_if_fail (factor > 0.0, 0);
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return PANGO_SCALE * value * res / factor;
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}
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}
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static gint
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gimp_text_layout_point_size (Gimp *gimp,
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gdouble value,
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GimpUnit unit,
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gdouble res)
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{
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gdouble factor;
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switch (unit)
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{
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case GIMP_UNIT_POINT:
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return PANGO_SCALE * value;
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case GIMP_UNIT_PIXEL:
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g_return_val_if_fail (res > 0.0, 0);
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return (PANGO_SCALE * value *
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_gimp_unit_get_factor (gimp, GIMP_UNIT_POINT) / res);
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default:
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factor = _gimp_unit_get_factor (gimp, unit);
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g_return_val_if_fail (factor > 0.0, 0);
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return (PANGO_SCALE * value *
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_gimp_unit_get_factor (gimp, GIMP_UNIT_POINT) / factor);
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}
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}
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