mirror of https://github.com/GNOME/gimp.git
744 lines
20 KiB
C
744 lines
20 KiB
C
/* GIMP - The GNU 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 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 <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <pango/pangocairo.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "text-types.h"
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#include "core/gimperror.h"
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#include "gimptext.h"
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#include "gimptextlayout.h"
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#include "gimp-intl.h"
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struct _GimpTextLayout
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{
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GObject object;
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GimpText *text;
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gdouble xres;
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gdouble yres;
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PangoLayout *layout;
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PangoRectangle extents;
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};
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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 void gimp_text_layout_set_markup (GimpTextLayout *layout,
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GError **error);
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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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G_DEFINE_TYPE (GimpTextLayout, gimp_text_layout, G_TYPE_OBJECT)
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#define parent_class gimp_text_layout_parent_class
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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 = G_OBJECT_CLASS (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 = 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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gdouble xres,
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gdouble yres,
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GError **error)
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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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gint size;
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g_return_val_if_fail (GIMP_IS_TEXT (text), 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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size = pango_units_from_double (gimp_units_to_points (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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layout->xres = xres;
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layout->yres = yres;
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pango_layout_set_wrap (layout->layout, PANGO_WRAP_WORD_CHAR);
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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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gimp_text_layout_set_markup (layout, error);
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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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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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pango_units_from_double
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(gimp_units_to_pixels (text->box_width,
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text->box_unit,
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xres) -
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2 * layout->text->border));
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break;
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}
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pango_layout_set_indent (layout->layout,
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pango_units_from_double
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(gimp_units_to_pixels (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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pango_units_from_double
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(gimp_units_to_pixels (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.width = ceil (gimp_units_to_pixels (text->box_width,
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text->box_unit,
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xres));
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layout->extents.height = ceil (gimp_units_to_pixels (text->box_height,
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text->box_unit,
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yres));
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/* #define VERBOSE */
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#ifdef VERBOSE
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g_printerr ("extents set to %d x %d\n",
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layout->extents.width, layout->extents.height);
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#endif
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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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void
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gimp_text_layout_get_resolution (GimpTextLayout *layout,
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gdouble *xres,
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gdouble *yres)
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{
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (xres)
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*xres = layout->xres;
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if (yres)
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*yres = layout->yres;
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}
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GimpText *
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gimp_text_layout_get_text (GimpTextLayout *layout)
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{
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g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), NULL);
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return layout->text;
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}
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PangoLayout *
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gimp_text_layout_get_pango_layout (GimpTextLayout *layout)
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{
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g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), NULL);
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return layout->layout;
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}
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void
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gimp_text_layout_get_transform (GimpTextLayout *layout,
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cairo_matrix_t *matrix)
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{
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GimpText *text;
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gdouble xres;
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gdouble yres;
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gdouble norm;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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g_return_if_fail (matrix != NULL);
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text = gimp_text_layout_get_text (layout);
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gimp_text_layout_get_resolution (layout, &xres, &yres);
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norm = 1.0 / yres * xres;
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matrix->xx = text->transformation.coeff[0][0] * norm;
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matrix->xy = text->transformation.coeff[0][1] * 1.0;
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matrix->yx = text->transformation.coeff[1][0] * norm;
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matrix->yy = text->transformation.coeff[1][1] * 1.0;
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matrix->x0 = 0;
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matrix->y0 = 0;
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}
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void
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gimp_text_layout_transform_rect (GimpTextLayout *layout,
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PangoRectangle *rect)
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{
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cairo_matrix_t matrix;
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gdouble x, y;
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gdouble width, height;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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g_return_if_fail (rect != NULL);
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x = rect->x;
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y = rect->y;
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width = rect->width;
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height = rect->height;
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gimp_text_layout_get_transform (layout, &matrix);
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cairo_matrix_transform_point (&matrix, &x, &y);
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cairo_matrix_transform_distance (&matrix, &width, &height);
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rect->x = ROUND (x);
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rect->y = ROUND (y);
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rect->width = ROUND (width);
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rect->height = ROUND (height);
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}
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void
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gimp_text_layout_transform_point (GimpTextLayout *layout,
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gdouble *x,
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gdouble *y)
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{
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cairo_matrix_t matrix;
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gdouble _x = 0.0;
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gdouble _y = 0.0;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (x) _x = *x;
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if (y) _y = *y;
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gimp_text_layout_get_transform (layout, &matrix);
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cairo_matrix_transform_point (&matrix, &_x, &_y);
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if (x) *x = _x;
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if (y) *y = _y;
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}
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void
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gimp_text_layout_transform_distance (GimpTextLayout *layout,
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gdouble *x,
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gdouble *y)
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{
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cairo_matrix_t matrix;
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gdouble _x = 0.0;
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gdouble _y = 0.0;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (x) _x = *x;
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if (y) _y = *y;
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gimp_text_layout_get_transform (layout, &matrix);
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cairo_matrix_transform_distance (&matrix, &_x, &_y);
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if (x) *x = _x;
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if (y) *y = _y;
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}
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void
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gimp_text_layout_untransform_rect (GimpTextLayout *layout,
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PangoRectangle *rect)
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{
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cairo_matrix_t matrix;
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gdouble x, y;
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gdouble width, height;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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g_return_if_fail (rect != NULL);
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x = rect->x;
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y = rect->y;
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width = rect->width;
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height = rect->height;
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gimp_text_layout_get_transform (layout, &matrix);
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if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS)
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{
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cairo_matrix_transform_point (&matrix, &x, &y);
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cairo_matrix_transform_distance (&matrix, &width, &height);
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rect->x = ROUND (x);
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rect->y = ROUND (y);
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rect->width = ROUND (width);
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rect->height = ROUND (height);
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}
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}
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void
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gimp_text_layout_untransform_point (GimpTextLayout *layout,
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gdouble *x,
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gdouble *y)
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{
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cairo_matrix_t matrix;
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gdouble _x = 0.0;
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gdouble _y = 0.0;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (x) _x = *x;
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if (y) _y = *y;
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gimp_text_layout_get_transform (layout, &matrix);
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if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS)
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{
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cairo_matrix_transform_point (&matrix, &_x, &_y);
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if (x) *x = _x;
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if (y) *y = _y;
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}
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}
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void
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gimp_text_layout_untransform_distance (GimpTextLayout *layout,
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gdouble *x,
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gdouble *y)
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{
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cairo_matrix_t matrix;
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gdouble _x = 0.0;
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gdouble _y = 0.0;
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g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
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if (x) _x = *x;
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if (y) _y = *y;
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gimp_text_layout_get_transform (layout, &matrix);
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if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS)
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{
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cairo_matrix_transform_distance (&matrix, &_x, &_y);
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if (x) *x = _x;
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if (y) *y = _y;
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}
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}
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static gboolean
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gimp_text_layout_split_markup (const gchar *markup,
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gchar **open_tag,
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gchar **content,
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gchar **close_tag)
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{
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gchar *p_open;
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gchar *p_close;
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p_open = strstr (markup, "<markup>");
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if (! p_open)
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return FALSE;
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*open_tag = g_strndup (markup, p_open - markup + strlen ("<markup>"));
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p_close = g_strrstr (markup, "</markup>");
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if (! p_close)
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{
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g_free (*open_tag);
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return FALSE;
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}
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*close_tag = g_strdup (p_close);
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if (p_open + strlen ("<markup>") < p_close)
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{
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*content = g_strndup (p_open + strlen ("<markup>"),
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p_close - p_open - strlen ("<markup>"));
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}
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else
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{
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*content = g_strdup ("");
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}
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return TRUE;
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}
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static gchar *
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gimp_text_layout_apply_tags (GimpTextLayout *layout,
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const gchar *markup)
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{
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GimpText *text = layout->text;
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gchar *result;
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{
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guchar r, g, b;
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gimp_rgb_get_uchar (&text->color, &r, &g, &b);
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result = g_strdup_printf ("<span color=\"#%02x%02x%02x\">%s</span>",
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r, g, b, markup);
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}
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if (fabs (text->letter_spacing) > 0.1)
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{
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gchar *tmp = g_strdup_printf ("<span letter_spacing=\"%d\">%s</span>",
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(gint) (text->letter_spacing * PANGO_SCALE),
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result);
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g_free (result);
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result = tmp;
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}
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return result;
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}
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static void
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gimp_text_layout_set_markup (GimpTextLayout *layout,
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GError **error)
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{
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GimpText *text = layout->text;
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gchar *open_tag = NULL;
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gchar *content = NULL;
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gchar *close_tag = NULL;
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gchar *tagged;
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gchar *markup;
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if (text->markup)
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{
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if (! gimp_text_layout_split_markup (text->markup,
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&open_tag, &content, &close_tag))
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{
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open_tag = g_strdup ("<markup>");
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content = g_strdup ("");
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close_tag = g_strdup ("</markup>");
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}
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}
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else
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{
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open_tag = g_strdup ("<markup>");
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close_tag = g_strdup ("</markup>");
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if (text->text)
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content = g_markup_escape_text (text->text, -1);
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else
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content = g_strdup ("");
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}
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tagged = gimp_text_layout_apply_tags (layout, content);
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g_free (content);
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markup = g_strconcat (open_tag, tagged, close_tag, NULL);
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g_free (open_tag);
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g_free (tagged);
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g_free (close_tag);
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if (pango_parse_markup (markup, -1, 0, NULL, NULL, NULL, error) == FALSE)
|
|
{
|
|
if (error && *error &&
|
|
(*error)->domain == G_MARKUP_ERROR &&
|
|
(*error)->code == G_MARKUP_ERROR_INVALID_CONTENT)
|
|
{
|
|
/* Errors from pango lib are not accurate enough.
|
|
* Other possible error codes are: G_MARKUP_ERROR_UNKNOWN_ELEMENT
|
|
* and G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE, which likely indicate a bug
|
|
* in GIMP code or a pango library version issue.
|
|
* G_MARKUP_ERROR_INVALID_CONTENT on the other hand likely indicates
|
|
* size/color/style/weight/variant/etc. value issue. Font size is the
|
|
* only free text in GIMP GUI so we assume that must be it.
|
|
* Also we output a custom message because pango's error->message is
|
|
* too technical (telling of <span> tags, not using user's font size
|
|
* unit, and such). */
|
|
g_error_free (*error);
|
|
*error = NULL;
|
|
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
|
|
_("The new text layout cannot be generated. "
|
|
"Most likely the font size is too big."));
|
|
}
|
|
}
|
|
else
|
|
pango_layout_set_markup (layout->layout, markup, -1);
|
|
|
|
g_free (markup);
|
|
}
|
|
|
|
static void
|
|
gimp_text_layout_position (GimpTextLayout *layout)
|
|
{
|
|
PangoRectangle ink;
|
|
PangoRectangle logical;
|
|
gint x1, y1;
|
|
gint x2, y2;
|
|
|
|
layout->extents.x = 0;
|
|
layout->extents.y = 0;
|
|
layout->extents.width = 0;
|
|
layout->extents.height = 0;
|
|
|
|
pango_layout_get_pixel_extents (layout->layout, &ink, &logical);
|
|
|
|
ink.width = ceil ((gdouble) ink.width * layout->xres / layout->yres);
|
|
logical.width = ceil ((gdouble) logical.width * layout->xres / layout->yres);
|
|
|
|
#ifdef VERBOSE
|
|
g_printerr ("ink rect: %d x %d @ %d, %d\n",
|
|
ink.width, ink.height, ink.x, ink.y);
|
|
g_printerr ("logical rect: %d x %d @ %d, %d\n",
|
|
logical.width, logical.height, logical.x, logical.y);
|
|
#endif
|
|
|
|
if (ink.width < 1 || ink.height < 1)
|
|
{
|
|
layout->extents.width = 1;
|
|
layout->extents.height = logical.height;
|
|
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 the width of the layout is > 0, then the text-box is FIXED and
|
|
* the layout position should be offset if the alignment is centered
|
|
* or right-aligned, also adjust for RTL text direction.
|
|
*/
|
|
if (pango_layout_get_width (layout->layout) > 0)
|
|
{
|
|
PangoAlignment align = pango_layout_get_alignment (layout->layout);
|
|
GimpTextDirection base_dir = layout->text->base_dir;
|
|
gint width;
|
|
|
|
pango_layout_get_pixel_size (layout->layout, &width, NULL);
|
|
|
|
if ((base_dir == GIMP_TEXT_DIRECTION_LTR && align == PANGO_ALIGN_RIGHT) ||
|
|
(base_dir == GIMP_TEXT_DIRECTION_RTL && align == PANGO_ALIGN_LEFT))
|
|
{
|
|
layout->extents.x +=
|
|
PANGO_PIXELS (pango_layout_get_width (layout->layout)) - width;
|
|
}
|
|
else if (align == PANGO_ALIGN_CENTER)
|
|
{
|
|
layout->extents.x +=
|
|
(PANGO_PIXELS (pango_layout_get_width (layout->layout)) - width) / 2;
|
|
}
|
|
}
|
|
|
|
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_printerr ("layout extents: %d x %d @ %d, %d\n",
|
|
layout->extents.width, layout->extents.height,
|
|
layout->extents.x, layout->extents.y);
|
|
#endif
|
|
}
|
|
|
|
static cairo_font_options_t *
|
|
gimp_text_get_font_options (GimpText *text)
|
|
{
|
|
cairo_font_options_t *options = cairo_font_options_create ();
|
|
|
|
cairo_font_options_set_antialias (options, (text->antialias ?
|
|
CAIRO_ANTIALIAS_DEFAULT :
|
|
CAIRO_ANTIALIAS_NONE));
|
|
|
|
switch (text->hint_style)
|
|
{
|
|
case GIMP_TEXT_HINT_STYLE_NONE:
|
|
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
|
|
break;
|
|
|
|
case GIMP_TEXT_HINT_STYLE_SLIGHT:
|
|
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_SLIGHT);
|
|
break;
|
|
|
|
case GIMP_TEXT_HINT_STYLE_MEDIUM:
|
|
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_MEDIUM);
|
|
break;
|
|
|
|
case GIMP_TEXT_HINT_STYLE_FULL:
|
|
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_FULL);
|
|
break;
|
|
}
|
|
|
|
return options;
|
|
}
|
|
|
|
static PangoContext *
|
|
gimp_text_get_pango_context (GimpText *text,
|
|
gdouble xres,
|
|
gdouble yres)
|
|
{
|
|
PangoContext *context;
|
|
PangoFontMap *fontmap;
|
|
cairo_font_options_t *options;
|
|
|
|
fontmap = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
|
|
if (! fontmap)
|
|
g_error ("You are using a Pango that has been built against a cairo "
|
|
"that lacks the Freetype font backend");
|
|
|
|
pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap), yres);
|
|
|
|
context = pango_font_map_create_context (fontmap);
|
|
g_object_unref (fontmap);
|
|
|
|
options = gimp_text_get_font_options (text);
|
|
pango_cairo_context_set_font_options (context, options);
|
|
cairo_font_options_destroy (options);
|
|
|
|
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;
|
|
}
|