forked from AuroraMiddleware/gtk
fe8da19f2a
2000-11-14 Havoc Pennington <hp@redhat.com> * gdk/gdkpango.c (gdk_draw_layout_line): Draw underlines one pixel higher. * gtk/gtktextdisplay.c (render_layout_line): Take rise into account. Also, render rise, underline, background, etc. for pixbufs as well as text. Also, draw underlines one pixel higher. * gtk/gtktextlayout.c (gtk_text_layout_get_line_display): Add a PangoAttribute for the rise, so it gets drawn properly. Also, add the GtkTextAppearance attribute for pixbuf/widget segments as well; we should go ahead and have rise, underline, background, stipple work for those * gtk/gtktexttag.c: Rename "offset" property to "rise" to match Pango
380 lines
9.7 KiB
C
380 lines
9.7 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 "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 void gdk_pango_get_item_properties (PangoItem *item,
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PangoUnderline *uline,
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gint *rise,
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PangoAttrColor *fg_color,
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gboolean *fg_set,
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PangoAttrColor *bg_color,
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gboolean *bg_set,
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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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PangoAttrColor *fg_color,
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GdkGC *base_gc)
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{
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GdkPangoContextInfo *info;
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GdkColormap *colormap;
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GdkColor color;
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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 && info->colormap)
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colormap = info->colormap;
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else
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colormap = gdk_colormap_get_system();
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/* FIXME. FIXME. FIXME. Only works for true 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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if (gdk_colormap_alloc_color (colormap, &color, FALSE, TRUE))
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{
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GdkGC *result = gdk_gc_new (gdk_parent_root);
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gdk_gc_copy (result, base_gc);
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gdk_gc_set_foreground (result, &color);
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return result;
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}
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else
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return gdk_gc_ref (base_gc);
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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:
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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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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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g_return_if_fail (drawable != NULL);
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g_return_if_fail (gc != NULL);
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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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PangoAttrColor fg_color, bg_color;
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gboolean 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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&rise,
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&fg_color, &fg_set,
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&bg_color, &bg_set,
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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)
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{
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GdkGC *bg_gc = gdk_pango_get_gc (context, &bg_color, 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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gdk_pango_free_gc (context, bg_gc);
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}
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if (fg_set)
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fg_gc = gdk_pango_get_gc (context, &fg_color, gc);
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else
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fg_gc = gc;
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if (!shape_set)
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gdk_draw_glyphs (drawable, fg_gc, run->item->analysis.font,
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x + x_off / PANGO_SCALE,
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risen_y,
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run->glyphs);
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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 (fg_set)
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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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*
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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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PangoLayoutIter *iter;
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g_return_if_fail (drawable != NULL);
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g_return_if_fail (gc != NULL);
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g_return_if_fail (layout != NULL);
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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 (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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}
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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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static void
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gdk_pango_get_item_properties (PangoItem *item,
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PangoUnderline *uline,
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gint *rise,
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PangoAttrColor *fg_color,
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gboolean *fg_set,
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PangoAttrColor *bg_color,
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gboolean *bg_set,
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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->extra_attrs;
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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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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_FOREGROUND:
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if (fg_color)
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*fg_color = *((PangoAttrColor *)attr);
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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);
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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)
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*logical_rect = ((PangoAttrShape *)attr)->logical_rect;
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if (ink_rect)
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*ink_rect = ((PangoAttrShape *)attr)->ink_rect;
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break;
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case PANGO_ATTR_RISE:
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if (rise)
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*rise = ((PangoAttrInt *)attr)->value;
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break;
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default:
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break;
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}
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tmp_list = tmp_list->next;
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}
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}
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