mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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22491fd6a4
Mon Jun 11 18:15:16 2001 Owen Taylor <otaylor@redhat.com> * gdk/gdk.h: Add missing gdk_rectangle_get_type() prototype. * gtk/gtk[hv]scale.c: Include math.h, stdlib.h * gdk/gdkpango.h gtk/gtkclist.c gtk/gtkentry.c gtk/gtkmain.[ch] gtk/gtkspinbutton.c gtk/gtkstyle.c gtk/gtktextbuffer.c gtk/gtktextdisplay.c gtk/gtktextiter.[ch] gtk/gtktextlayout.c gtk/gtktexttag.[ch] gtk/gtkwidget.c: Adapt to recent changes in Pango. * tests/testgtk.c: Set language tags with gtk_label_set_markup() to test whether the basic engine honors them.
810 lines
24 KiB
C
810 lines
24 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2000 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gdkcolor.h"
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#include "gdkgc.h"
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#include "gdkpango.h"
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#include "gdkrgb.h"
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#include "gdkprivate.h"
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#define GDK_INFO_KEY "gdk-info"
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typedef struct _GdkPangoContextInfo GdkPangoContextInfo;
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struct _GdkPangoContextInfo
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{
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GdkColormap *colormap;
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};
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static PangoAttrType gdk_pango_attr_stipple_type;
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static PangoAttrType gdk_pango_attr_embossed_type;
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static void gdk_pango_get_item_properties (PangoItem *item,
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PangoUnderline *uline,
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gboolean *strikethrough,
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gint *rise,
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PangoColor *fg_color,
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gboolean *fg_set,
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PangoColor *bg_color,
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gboolean *bg_set,
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gboolean *embossed,
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GdkBitmap **stipple,
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gboolean *shape_set,
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PangoRectangle *ink_rect,
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PangoRectangle *logical_rect);
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static void
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gdk_pango_context_destroy (GdkPangoContextInfo *info)
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{
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gdk_colormap_unref (info->colormap);
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g_free (info);
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}
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static GdkPangoContextInfo *
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gdk_pango_context_get_info (PangoContext *context, gboolean create)
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{
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GdkPangoContextInfo *info =
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g_object_get_qdata (G_OBJECT (context),
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g_quark_try_string (GDK_INFO_KEY));
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if (!info && create)
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{
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info = g_new (GdkPangoContextInfo, 1);
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info->colormap = NULL;
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g_object_set_qdata_full (G_OBJECT (context),
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g_quark_from_static_string (GDK_INFO_KEY),
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info, (GDestroyNotify)gdk_pango_context_destroy);
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}
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return info;
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}
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static GdkGC *
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gdk_pango_get_gc (PangoContext *context,
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PangoColor *fg_color,
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GdkBitmap *stipple,
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GdkGC *base_gc)
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{
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GdkGC *result;
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GdkPangoContextInfo *info;
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g_return_val_if_fail (context != NULL, NULL);
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info = gdk_pango_context_get_info (context, FALSE);
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if (info == NULL || info->colormap == NULL)
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{
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g_warning ("you must set the colormap on a PangoContext before using it to draw a layout");
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return NULL;
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}
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result = gdk_gc_new (gdk_parent_root);
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gdk_gc_copy (result, base_gc);
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if (fg_color)
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{
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GdkColor color;
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color.red = fg_color->red;
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color.green = fg_color->green;
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color.blue = fg_color->blue;
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gdk_rgb_find_color (info->colormap, &color);
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gdk_gc_set_foreground (result, &color);
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}
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if (stipple)
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{
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gdk_gc_set_fill (result, GDK_STIPPLED);
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gdk_gc_set_stipple (result, stipple);
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}
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return result;
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}
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static void
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gdk_pango_free_gc (PangoContext *context,
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GdkGC *gc)
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{
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gdk_gc_unref (gc);
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}
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void
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gdk_pango_context_set_colormap (PangoContext *context,
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GdkColormap *colormap)
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{
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GdkPangoContextInfo *info;
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g_return_if_fail (context != NULL);
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info = gdk_pango_context_get_info (context, TRUE);
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g_return_if_fail (info != NULL);
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if (info->colormap != colormap)
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{
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if (info->colormap)
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gdk_colormap_unref (info->colormap);
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info->colormap = colormap;
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if (info->colormap)
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gdk_colormap_ref (info->colormap);
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}
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}
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/**
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* gdk_draw_layout_line_with_colors:
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* @drawable: the drawable on which to draw the line
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* @gc: base graphics to use
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* @x: the x position of start of string (in pixels)
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* @y: the y position of baseline (in pixels)
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* @line: a #PangoLayoutLine
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* @foreground: foreground override color, or %NULL for none
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* @background: background override color, or %NULL for none
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*
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* Render a #PangoLayoutLine onto a #GdkDrawable, overriding the
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* layout's normal colors with @foreground and/or @background.
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* @foreground and @background need not be allocated.
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*/
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void
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gdk_draw_layout_line_with_colors (GdkDrawable *drawable,
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GdkGC *gc,
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gint x,
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gint y,
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PangoLayoutLine *line,
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GdkColor *foreground,
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GdkColor *background)
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{
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GSList *tmp_list = line->runs;
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PangoRectangle overall_rect;
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PangoRectangle logical_rect;
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PangoRectangle ink_rect;
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PangoContext *context;
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gint x_off = 0;
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gint rise = 0;
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gboolean embossed;
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GdkBitmap *stipple;
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (line != NULL);
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context = pango_layout_get_context (line->layout);
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pango_layout_line_get_extents (line,NULL, &overall_rect);
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while (tmp_list)
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{
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PangoUnderline uline = PANGO_UNDERLINE_NONE;
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PangoLayoutRun *run = tmp_list->data;
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PangoColor fg_color, bg_color;
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gboolean strike, fg_set, bg_set, shape_set;
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GdkGC *fg_gc;
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gint risen_y;
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tmp_list = tmp_list->next;
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gdk_pango_get_item_properties (run->item, &uline,
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&strike,
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&rise,
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&fg_color, &fg_set,
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&bg_color, &bg_set,
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&embossed,
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&stipple,
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&shape_set,
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&ink_rect,
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&logical_rect);
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/* we subtract the rise because X coordinates are upside down */
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risen_y = y - rise / PANGO_SCALE;
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if (!shape_set)
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{
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if (uline == PANGO_UNDERLINE_NONE)
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pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
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NULL, &logical_rect);
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else
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pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
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&ink_rect, &logical_rect);
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}
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if (bg_set || background)
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{
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GdkGC *bg_gc;
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PangoColor tmp = bg_color;
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if (background)
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{
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tmp.red = background->red;
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tmp.blue = background->blue;
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tmp.green = background->green;
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}
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bg_gc = gdk_pango_get_gc (context, &tmp, stipple, gc);
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gdk_draw_rectangle (drawable, bg_gc, TRUE,
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x + (x_off + logical_rect.x) / PANGO_SCALE,
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risen_y + overall_rect.y / PANGO_SCALE,
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logical_rect.width / PANGO_SCALE,
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overall_rect.height / PANGO_SCALE);
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if (stipple)
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gdk_gc_set_fill (bg_gc, GDK_SOLID);
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gdk_pango_free_gc (context, bg_gc);
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}
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if (fg_set || stipple || foreground)
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{
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PangoColor tmp = fg_color;
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if (foreground)
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{
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tmp.red = foreground->red;
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tmp.blue = foreground->blue;
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tmp.green = foreground->green;
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}
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fg_gc = gdk_pango_get_gc (context, fg_set ? &tmp : NULL,
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stipple, gc);
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}
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else
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fg_gc = gc;
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if (!shape_set)
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{
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gint gx, gy;
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gx = x + x_off / PANGO_SCALE;
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gy = risen_y;
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if (embossed)
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{
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PangoColor color = { 65535, 65535, 65535 };
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GdkGC *white_gc = gdk_pango_get_gc (context, &color, stipple, fg_gc);
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gdk_draw_glyphs (drawable, white_gc, run->item->analysis.font,
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gx + 1,
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gy + 1,
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run->glyphs);
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gdk_pango_free_gc (context, white_gc);
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}
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gdk_draw_glyphs (drawable, fg_gc, run->item->analysis.font,
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gx, gy,
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run->glyphs);
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}
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switch (uline)
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{
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case PANGO_UNDERLINE_NONE:
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break;
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case PANGO_UNDERLINE_DOUBLE:
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gdk_draw_line (drawable, fg_gc,
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x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
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risen_y + 3,
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x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
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risen_y + 3);
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/* Fall through */
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case PANGO_UNDERLINE_SINGLE:
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gdk_draw_line (drawable, fg_gc,
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x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
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risen_y + 1,
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x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
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risen_y + 1);
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break;
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case PANGO_UNDERLINE_LOW:
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gdk_draw_line (drawable, fg_gc,
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x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
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risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1,
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x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
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risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1);
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break;
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}
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if (strike)
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{
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int centerline = logical_rect.y + logical_rect.height / 2;
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gdk_draw_line (drawable, fg_gc,
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x + (x_off + logical_rect.x) / PANGO_SCALE - 1,
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risen_y + centerline / PANGO_SCALE,
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x + (x_off + logical_rect.x + logical_rect.width) / PANGO_SCALE + 1,
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risen_y + centerline / PANGO_SCALE);
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}
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if (fg_gc != gc)
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gdk_pango_free_gc (context, fg_gc);
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x_off += logical_rect.width;
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}
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}
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/**
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* gdk_draw_layout:
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* @drawable: the drawable on which to draw string
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* @gc: base graphics context to use
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* @x: the X position of the left of the layout (in pixels)
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* @y: the Y position of the top of the layout (in pixels)
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* @layout: a #PangoLayout
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* @foreground: foreground override color, or %NULL for none
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* @background: background override color, or %NULL for none
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*
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* Render a #PangoLayout onto a #GdkDrawable, overriding the
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* layout's normal colors with @foreground and/or @background.
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* @foreground and @background need not be allocated.
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*/
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void
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gdk_draw_layout_with_colors (GdkDrawable *drawable,
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GdkGC *gc,
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int x,
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int y,
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PangoLayout *layout,
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GdkColor *foreground,
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GdkColor *background)
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{
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PangoLayoutIter *iter;
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (PANGO_IS_LAYOUT (layout));
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iter = pango_layout_get_iter (layout);
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do
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{
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PangoRectangle logical_rect;
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PangoLayoutLine *line;
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int baseline;
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line = pango_layout_iter_get_line (iter);
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pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
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baseline = pango_layout_iter_get_baseline (iter);
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gdk_draw_layout_line_with_colors (drawable, gc,
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x + logical_rect.x / PANGO_SCALE,
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y + baseline / PANGO_SCALE,
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line,
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foreground,
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background);
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}
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while (pango_layout_iter_next_line (iter));
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pango_layout_iter_free (iter);
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}
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/**
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* gdk_draw_layout_line:
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* @drawable: the drawable on which to draw the line
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* @gc: base graphics to use
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* @x: the x position of start of string (in pixels)
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* @y: the y position of baseline (in pixels)
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* @line: a #PangoLayoutLine
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*
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* Render a #PangoLayoutLine onto an GDK drawable
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*/
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void
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gdk_draw_layout_line (GdkDrawable *drawable,
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GdkGC *gc,
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gint x,
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gint y,
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PangoLayoutLine *line)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (line != NULL);
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gdk_draw_layout_line_with_colors (drawable, gc, x, y, line, NULL, NULL);
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}
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/**
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* gdk_draw_layout:
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* @drawable: the drawable on which to draw string
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* @gc: base graphics context to use
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* @x: the X position of the left of the layout (in pixels)
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* @y: the Y position of the top of the layout (in pixels)
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* @layout: a #PangoLayout
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*
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* Render a #PangoLayout onto a GDK drawable
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*/
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void
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gdk_draw_layout (GdkDrawable *drawable,
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GdkGC *gc,
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int x,
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int y,
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PangoLayout *layout)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (PANGO_IS_LAYOUT (layout));
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gdk_draw_layout_with_colors (drawable, gc, x, y, layout, NULL, NULL);
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}
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static void
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gdk_pango_get_item_properties (PangoItem *item,
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PangoUnderline *uline,
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gboolean *strikethrough,
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gint *rise,
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PangoColor *fg_color,
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gboolean *fg_set,
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PangoColor *bg_color,
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gboolean *bg_set,
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gboolean *embossed,
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GdkBitmap **stipple,
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gboolean *shape_set,
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PangoRectangle *ink_rect,
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PangoRectangle *logical_rect)
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{
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GSList *tmp_list = item->analysis.extra_attrs;
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if (strikethrough)
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*strikethrough = FALSE;
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if (fg_set)
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*fg_set = FALSE;
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if (bg_set)
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*bg_set = FALSE;
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if (shape_set)
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*shape_set = FALSE;
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if (rise)
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*rise = 0;
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if (embossed)
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*embossed = FALSE;
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if (stipple)
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*stipple = NULL;
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while (tmp_list)
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{
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PangoAttribute *attr = tmp_list->data;
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switch (attr->klass->type)
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{
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case PANGO_ATTR_UNDERLINE:
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if (uline)
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*uline = ((PangoAttrInt *)attr)->value;
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break;
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case PANGO_ATTR_STRIKETHROUGH:
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if (strikethrough)
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*strikethrough = ((PangoAttrInt *)attr)->value;
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break;
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case PANGO_ATTR_FOREGROUND:
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if (fg_color)
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*fg_color = ((PangoAttrColor *)attr)->color;
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if (fg_set)
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*fg_set = TRUE;
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break;
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case PANGO_ATTR_BACKGROUND:
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if (bg_color)
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*bg_color = ((PangoAttrColor *)attr)->color;
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if (bg_set)
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*bg_set = TRUE;
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break;
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case PANGO_ATTR_SHAPE:
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if (shape_set)
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*shape_set = TRUE;
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if (logical_rect)
|
|
*logical_rect = ((PangoAttrShape *)attr)->logical_rect;
|
|
if (ink_rect)
|
|
*ink_rect = ((PangoAttrShape *)attr)->ink_rect;
|
|
break;
|
|
|
|
case PANGO_ATTR_RISE:
|
|
if (rise)
|
|
*rise = ((PangoAttrInt *)attr)->value;
|
|
break;
|
|
|
|
default:
|
|
/* stipple_type and embossed_type aren't necessarily
|
|
* initialized, but they are 0, which is an
|
|
* invalid type so won't occur.
|
|
*/
|
|
if (stipple && attr->klass->type == gdk_pango_attr_stipple_type)
|
|
{
|
|
*stipple = ((GdkPangoAttrStipple*)attr)->stipple;
|
|
}
|
|
else if (embossed && attr->klass->type == gdk_pango_attr_embossed_type)
|
|
{
|
|
*embossed = ((GdkPangoAttrEmbossed*)attr)->embossed;
|
|
}
|
|
break;
|
|
}
|
|
tmp_list = tmp_list->next;
|
|
}
|
|
}
|
|
|
|
|
|
static PangoAttribute *
|
|
gdk_pango_attr_stipple_copy (const PangoAttribute *attr)
|
|
{
|
|
const GdkPangoAttrStipple *src = (const GdkPangoAttrStipple*) attr;
|
|
|
|
return gdk_pango_attr_stipple_new (src->stipple);
|
|
}
|
|
|
|
static void
|
|
gdk_pango_attr_stipple_destroy (PangoAttribute *attr)
|
|
{
|
|
GdkPangoAttrStipple *st = (GdkPangoAttrStipple*) attr;
|
|
|
|
if (st->stipple)
|
|
g_object_unref (G_OBJECT (st->stipple));
|
|
|
|
g_free (attr);
|
|
}
|
|
|
|
static gboolean
|
|
gdk_pango_attr_stipple_compare (const PangoAttribute *attr1,
|
|
const PangoAttribute *attr2)
|
|
{
|
|
const GdkPangoAttrStipple *a = (const GdkPangoAttrStipple*) attr1;
|
|
const GdkPangoAttrStipple *b = (const GdkPangoAttrStipple*) attr2;
|
|
|
|
return a->stipple == b->stipple;
|
|
}
|
|
|
|
/**
|
|
* gdk_pango_attr_stipple_new:
|
|
* @stipple: a bitmap to be set as stipple
|
|
*
|
|
* Creates a new attribute containing a stipple bitmap to be used when
|
|
* rendering the text.
|
|
*
|
|
* Return value: new #PangoAttribute
|
|
**/
|
|
|
|
PangoAttribute *
|
|
gdk_pango_attr_stipple_new (GdkBitmap *stipple)
|
|
{
|
|
GdkPangoAttrStipple *result;
|
|
|
|
static PangoAttrClass klass = {
|
|
0,
|
|
gdk_pango_attr_stipple_copy,
|
|
gdk_pango_attr_stipple_destroy,
|
|
gdk_pango_attr_stipple_compare
|
|
};
|
|
|
|
if (!klass.type)
|
|
klass.type = gdk_pango_attr_stipple_type =
|
|
pango_attr_type_register ("GdkPangoAttrStipple");
|
|
|
|
result = g_new (GdkPangoAttrStipple, 1);
|
|
result->attr.klass = &klass;
|
|
|
|
if (stipple)
|
|
g_object_ref (stipple);
|
|
|
|
result->stipple = stipple;
|
|
|
|
return (PangoAttribute *)result;
|
|
}
|
|
|
|
static PangoAttribute *
|
|
gdk_pango_attr_embossed_copy (const PangoAttribute *attr)
|
|
{
|
|
const GdkPangoAttrEmbossed *e = (const GdkPangoAttrEmbossed*) attr;
|
|
|
|
return gdk_pango_attr_embossed_new (e->embossed);
|
|
}
|
|
|
|
static void
|
|
gdk_pango_attr_embossed_destroy (PangoAttribute *attr)
|
|
{
|
|
g_free (attr);
|
|
}
|
|
|
|
static gboolean
|
|
gdk_pango_attr_embossed_compare (const PangoAttribute *attr1,
|
|
const PangoAttribute *attr2)
|
|
{
|
|
const GdkPangoAttrEmbossed *e1 = (const GdkPangoAttrEmbossed*) attr1;
|
|
const GdkPangoAttrEmbossed *e2 = (const GdkPangoAttrEmbossed*) attr2;
|
|
|
|
return e1->embossed == e2->embossed;
|
|
}
|
|
|
|
/**
|
|
* gdk_pango_attr_embossed_new:
|
|
* @embossed: a bitmap to be set as embossed
|
|
*
|
|
* Creates a new attribute containing a embossed bitmap to be used when
|
|
* rendering the text.
|
|
*
|
|
* Return value: new #PangoAttribute
|
|
**/
|
|
|
|
PangoAttribute *
|
|
gdk_pango_attr_embossed_new (gboolean embossed)
|
|
{
|
|
GdkPangoAttrEmbossed *result;
|
|
|
|
static PangoAttrClass klass = {
|
|
0,
|
|
gdk_pango_attr_embossed_copy,
|
|
gdk_pango_attr_embossed_destroy,
|
|
gdk_pango_attr_embossed_compare
|
|
};
|
|
|
|
if (!klass.type)
|
|
klass.type = gdk_pango_attr_embossed_type =
|
|
pango_attr_type_register ("GdkPangoAttrEmbossed");
|
|
|
|
result = g_new (GdkPangoAttrEmbossed, 1);
|
|
result->attr.klass = &klass;
|
|
result->embossed = embossed;
|
|
|
|
return (PangoAttribute *)result;
|
|
}
|
|
|
|
/* Get a clip region to draw only part of a layout. index_ranges
|
|
* contains alternating range starts/stops. The region is the
|
|
* region which contains the given ranges, i.e. if you draw with the
|
|
* region as clip, only the given ranges are drawn.
|
|
*/
|
|
|
|
/**
|
|
* gdk_pango_layout_line_get_clip_region:
|
|
* @line: a #PangoLayoutLine
|
|
* @x_origin: X pixel where you intend to draw the layout line with this clip
|
|
* @y_origin: baseline pixel where you intend to draw the layout line with this clip
|
|
* @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
|
|
* @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
|
|
*
|
|
* Obtains a clip region which contains the areas where the given
|
|
* ranges of text would be drawn. @x_origin and @y_origin are the same
|
|
* position you would pass to gdk_draw_layout_line(). @index_ranges
|
|
* should contain ranges of bytes in the layout's text. The clip
|
|
* region will include space to the left or right of the line (to the
|
|
* layout bounding box) if you have indexes above or below the indexes
|
|
* contained inside the line. This is to draw the selection all the way
|
|
* to the side of the layout. However, the clip region is in line coordinates,
|
|
* not layout coordinates.
|
|
*
|
|
* Return value: a clip region containing the given ranges
|
|
**/
|
|
GdkRegion*
|
|
gdk_pango_layout_line_get_clip_region (PangoLayoutLine *line,
|
|
gint x_origin,
|
|
gint y_origin,
|
|
gint *index_ranges,
|
|
gint n_ranges)
|
|
{
|
|
GdkRegion *clip_region;
|
|
gint i;
|
|
PangoRectangle logical_rect;
|
|
PangoLayoutIter *iter;
|
|
gint baseline;
|
|
|
|
g_return_val_if_fail (line != NULL, NULL);
|
|
g_return_val_if_fail (index_ranges != NULL, NULL);
|
|
|
|
clip_region = gdk_region_new ();
|
|
|
|
iter = pango_layout_get_iter (line->layout);
|
|
while (pango_layout_iter_get_line (iter) != line)
|
|
pango_layout_iter_next_line (iter);
|
|
|
|
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
|
|
baseline = pango_layout_iter_get_baseline (iter);
|
|
|
|
i = 0;
|
|
while (i < n_ranges)
|
|
{
|
|
gint *pixel_ranges = NULL;
|
|
gint n_pixel_ranges = 0;
|
|
gint j;
|
|
|
|
/* Note that get_x_ranges returns layout coordinates
|
|
*/
|
|
pango_layout_line_get_x_ranges (line,
|
|
index_ranges[i*2],
|
|
index_ranges[i*2+1],
|
|
&pixel_ranges, &n_pixel_ranges);
|
|
|
|
for (j=0; j < n_pixel_ranges; j++)
|
|
{
|
|
GdkRectangle rect;
|
|
|
|
rect.x = x_origin + pixel_ranges[2*j] / PANGO_SCALE - logical_rect.x / PANGO_SCALE;
|
|
rect.y = y_origin - (baseline / PANGO_SCALE - logical_rect.y / PANGO_SCALE);
|
|
rect.width = (pixel_ranges[2*j + 1] - pixel_ranges[2*j]) / PANGO_SCALE;
|
|
rect.height = logical_rect.height / PANGO_SCALE;
|
|
|
|
gdk_region_union_with_rect (clip_region, &rect);
|
|
}
|
|
|
|
g_free (pixel_ranges);
|
|
++i;
|
|
}
|
|
|
|
return clip_region;
|
|
}
|
|
|
|
/**
|
|
* gdk_pango_layout_get_clip_region:
|
|
* @layout: a #PangoLayout
|
|
* @x_origin: X pixel where you intend to draw the layout with this clip
|
|
* @y_origin: Y pixel where you intend to draw the layout with this clip
|
|
* @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
|
|
* @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
|
|
*
|
|
* Obtains a clip region which contains the areas where the given ranges
|
|
* of text would be drawn. @x_origin and @y_origin are the same position
|
|
* you would pass to gdk_draw_layout_line(). @index_ranges should contain
|
|
* ranges of bytes in the layout's text.
|
|
*
|
|
* Return value: a clip region containing the given ranges
|
|
**/
|
|
GdkRegion*
|
|
gdk_pango_layout_get_clip_region (PangoLayout *layout,
|
|
gint x_origin,
|
|
gint y_origin,
|
|
gint *index_ranges,
|
|
gint n_ranges)
|
|
{
|
|
PangoLayoutIter *iter;
|
|
GdkRegion *clip_region;
|
|
|
|
g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL);
|
|
g_return_val_if_fail (index_ranges != NULL, NULL);
|
|
|
|
clip_region = gdk_region_new ();
|
|
|
|
iter = pango_layout_get_iter (layout);
|
|
|
|
do
|
|
{
|
|
PangoRectangle logical_rect;
|
|
PangoLayoutLine *line;
|
|
GdkRegion *line_region;
|
|
gint baseline;
|
|
|
|
line = pango_layout_iter_get_line (iter);
|
|
|
|
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
|
|
baseline = pango_layout_iter_get_baseline (iter);
|
|
|
|
line_region = gdk_pango_layout_line_get_clip_region (line,
|
|
x_origin + logical_rect.x / PANGO_SCALE,
|
|
y_origin + baseline / PANGO_SCALE,
|
|
index_ranges,
|
|
n_ranges);
|
|
|
|
gdk_region_union (clip_region, line_region);
|
|
gdk_region_destroy (line_region);
|
|
}
|
|
while (pango_layout_iter_next_line (iter));
|
|
|
|
pango_layout_iter_free (iter);
|
|
|
|
return clip_region;
|
|
}
|