gtk2/gdk/gdkpango.c
Elliot Lee b3dd84048d Fix the second bug, draw underlines.
Fix the second bug, draw underlines.
2000-08-03 20:43:47 +00:00

393 lines
9.6 KiB
C

/* GDK - The GIMP Drawing Kit
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gdkcolor.h"
#include "gdkgc.h"
#include "gdkpango.h"
#include "gdkprivate.h"
#define GDK_INFO_KEY "gdk-info"
typedef struct _GdkPangoContextInfo GdkPangoContextInfo;
struct _GdkPangoContextInfo
{
GdkColormap *colormap;
};
static void gdk_pango_get_item_properties (PangoItem *item,
PangoUnderline *uline,
PangoAttrColor *fg_color,
gboolean *fg_set,
PangoAttrColor *bg_color,
gboolean *bg_set,
gboolean *shape_set,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
static void
gdk_pango_context_destroy (GdkPangoContextInfo *info)
{
gdk_colormap_unref (info->colormap);
g_free (info);
}
static GdkPangoContextInfo *
gdk_pango_context_get_info (PangoContext *context, gboolean create)
{
GdkPangoContextInfo *info =
g_object_get_qdata (G_OBJECT (context),
g_quark_try_string (GDK_INFO_KEY));
if (!info && create)
{
info = g_new (GdkPangoContextInfo, 1);
info->colormap = NULL;
g_object_set_qdata_full (G_OBJECT (context),
g_quark_from_static_string (GDK_INFO_KEY),
info, (GDestroyNotify)gdk_pango_context_destroy);
}
return info;
}
static GdkGC *
gdk_pango_get_gc (PangoContext *context,
PangoAttrColor *fg_color,
GdkGC *base_gc)
{
GdkPangoContextInfo *info;
GdkColormap *colormap;
GdkColor color;
g_return_val_if_fail (context != NULL, NULL);
info = gdk_pango_context_get_info (context, FALSE);
if (info && info->colormap)
colormap = info->colormap;
else
colormap = gdk_colormap_get_system();
/* FIXME. FIXME. FIXME. Only works for true color */
color.red = fg_color->red;
color.green = fg_color->green;
color.blue = fg_color->blue;
if (gdk_colormap_alloc_color (colormap, &color, FALSE, TRUE))
{
GdkGC *result = gdk_gc_new (gdk_parent_root);
gdk_gc_copy (result, base_gc);
gdk_gc_set_foreground (result, &color);
return result;
}
else
return gdk_gc_ref (base_gc);
}
static void
gdk_pango_free_gc (PangoContext *context,
GdkGC *gc)
{
gdk_gc_unref (gc);
}
void
gdk_pango_context_set_colormap (PangoContext *context,
GdkColormap *colormap)
{
GdkPangoContextInfo *info;
g_return_if_fail (context != NULL);
info = gdk_pango_context_get_info (context, TRUE);
g_return_if_fail (info != NULL);
if (info->colormap != colormap)
{
if (info->colormap)
gdk_colormap_unref (info->colormap);
info->colormap = colormap;
if (info->colormap)
gdk_colormap_ref (info->colormap);
}
}
/**
* gdk_draw_layout_line:
* @drawable: the drawable on which to draw the line
* @gc: base graphics to use
* @x: the x position of start of string (in pixels)
* @y: the y position of baseline (in pixels)
* @line: a #PangoLayoutLine
*
* Render a #PangoLayoutLine onto an GDK drawable
*/
void
gdk_draw_layout_line (GdkDrawable *drawable,
GdkGC *gc,
gint x,
gint y,
PangoLayoutLine *line)
{
GSList *tmp_list = line->runs;
PangoRectangle overall_rect;
PangoRectangle logical_rect;
PangoRectangle ink_rect;
PangoContext *context;
gint x_off = 0;
g_return_if_fail (drawable != NULL);
g_return_if_fail (gc != NULL);
g_return_if_fail (line != NULL);
context = pango_layout_get_context (line->layout);
pango_layout_line_get_extents (line,NULL, &overall_rect);
while (tmp_list)
{
PangoUnderline uline = PANGO_UNDERLINE_NONE;
PangoLayoutRun *run = tmp_list->data;
PangoAttrColor fg_color, bg_color;
gboolean fg_set, bg_set, shape_set;
GdkGC *fg_gc;
tmp_list = tmp_list->next;
gdk_pango_get_item_properties (run->item, &uline, &fg_color, &fg_set, &bg_color, &bg_set, &shape_set, &ink_rect,
&logical_rect);
if (!shape_set)
{
if (uline == PANGO_UNDERLINE_NONE)
pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
NULL, &logical_rect);
else
pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
&ink_rect, &logical_rect);
}
if (bg_set)
{
GdkGC *bg_gc = gdk_pango_get_gc (context, &bg_color, gc);
gdk_draw_rectangle (drawable, bg_gc, TRUE,
x + (x_off + logical_rect.x) / PANGO_SCALE,
y + overall_rect.y / PANGO_SCALE,
logical_rect.width / PANGO_SCALE,
overall_rect.height / PANGO_SCALE);
gdk_pango_free_gc (context, bg_gc);
}
if (fg_set)
fg_gc = gdk_pango_get_gc (context, &fg_color, gc);
else
fg_gc = gc;
if (!shape_set)
gdk_draw_glyphs (drawable, fg_gc, run->item->analysis.font,
x + x_off / PANGO_SCALE, y, run->glyphs);
switch (uline)
{
case PANGO_UNDERLINE_NONE:
break;
case PANGO_UNDERLINE_DOUBLE:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 4,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 4);
/* Fall through */
case PANGO_UNDERLINE_SINGLE:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 2,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 2);
break;
case PANGO_UNDERLINE_LOW:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2);
break;
}
if (fg_set)
gdk_pango_free_gc (context, fg_gc);
x_off += logical_rect.width;
}
}
/**
* gdk_draw_layout:
* @drawable: the drawable on which to draw string
* @gc: base graphics context to use
* @x: the X position of the left of the layout (in pixels)
* @y: the Y position of the top of the layout (in pixels)
* @layout: a #PangoLayout
*
* Render a #PangoLayout onto a GDK drawable
*/
void
gdk_draw_layout (GdkDrawable *drawable,
GdkGC *gc,
int x,
int y,
PangoLayout *layout)
{
PangoRectangle logical_rect;
GSList *tmp_list;
PangoAlignment align;
gint indent;
gint width;
gint y_offset = 0;
gboolean first = FALSE;
g_return_if_fail (drawable != NULL);
g_return_if_fail (gc != NULL);
g_return_if_fail (layout != NULL);
indent = pango_layout_get_indent (layout);
width = pango_layout_get_width (layout);
align = pango_layout_get_alignment (layout);
if (width == -1 && align != PANGO_ALIGN_LEFT)
{
pango_layout_get_extents (layout, NULL, &logical_rect);
width = logical_rect.width;
}
tmp_list = pango_layout_get_lines (layout);
while (tmp_list)
{
PangoLayoutLine *line = tmp_list->data;
int x_offset;
pango_layout_line_get_extents (line, NULL, &logical_rect);
if (width != -1 && align == PANGO_ALIGN_RIGHT)
x_offset = width - logical_rect.width;
else if (width != -1 && align == PANGO_ALIGN_CENTER)
x_offset = (width - logical_rect.width) / 2;
else
x_offset = 0;
if (first)
{
if (indent > 0)
{
if (align == PANGO_ALIGN_LEFT)
x_offset += indent;
else
x_offset -= indent;
}
first = FALSE;
}
else
{
if (indent < 0)
{
if (align == PANGO_ALIGN_LEFT)
x_offset -= indent;
else
x_offset += indent;
}
}
gdk_draw_layout_line (drawable, gc,
x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE,
line);
y_offset += logical_rect.height;
tmp_list = tmp_list->next;
}
}
static void
gdk_pango_get_item_properties (PangoItem *item,
PangoUnderline *uline,
PangoAttrColor *fg_color,
gboolean *fg_set,
PangoAttrColor *bg_color,
gboolean *bg_set,
gboolean *shape_set,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
GSList *tmp_list = item->extra_attrs;
if (fg_set)
*fg_set = FALSE;
if (bg_set)
*bg_set = FALSE;
if (shape_set)
*shape_set = FALSE;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
switch (attr->klass->type)
{
case PANGO_ATTR_UNDERLINE:
if (uline)
*uline = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_FOREGROUND:
if (fg_color)
*fg_color = *((PangoAttrColor *)attr);
if (fg_set)
*fg_set = TRUE;
break;
case PANGO_ATTR_BACKGROUND:
if (bg_color)
*bg_color = *((PangoAttrColor *)attr);
if (bg_set)
*bg_set = TRUE;
break;
case PANGO_ATTR_SHAPE:
if (shape_set)
*shape_set = TRUE;
if (logical_rect)
*logical_rect = ((PangoAttrShape *)attr)->logical_rect;
if (ink_rect)
*ink_rect = ((PangoAttrShape *)attr)->ink_rect;
break;
default:
break;
}
tmp_list = tmp_list->next;
}
}