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/* pangox.c: Routines for handling X fonts
*
* Copyright (C) 1999 Red Hat Software
* Copyright (C) 2000 SuSE Linux Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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 <string.h>
#include <stdlib.h>
#include <math.h>
#include <X11/Xlib.h>
#include "pango-impl-utils.h"
#include "pangox-private.h"
#define PANGO_TYPE_X_FONT (pango_x_font_get_type ())
#define PANGO_X_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_X_FONT, PangoXFont))
#define PANGO_X_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_X_FONT, PangoXFontClass))
#define PANGO_X_IS_FONT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_X_FONT))
#define PANGO_X_IS_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_X_FONT))
#define PANGO_X_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_X_FONT, PangoXFontClass))
typedef struct _PangoXFontClass PangoXFontClass;
typedef struct _PangoXMetricsInfo PangoXMetricsInfo;
typedef struct _PangoXContextInfo PangoXContextInfo;
struct _PangoXSubfontInfo
{
char *xlfd;
XFontStruct *font_struct;
gboolean is_1byte;
int range_byte1;
int range_byte2;
};
struct _PangoXMetricsInfo
{
const char *sample_str;
PangoFontMetrics *metrics;
};
struct _PangoXContextInfo
{
PangoGetGCFunc get_gc_func;
PangoFreeGCFunc free_gc_func;
};
struct _PangoXFontClass
{
PangoFontClass parent_class;
};
static PangoFontClass *parent_class; /* Parent class structure for PangoXFont */
static void pango_x_font_class_init (PangoXFontClass *class);
static void pango_x_font_init (PangoXFont *xfont);
static void pango_x_font_dispose (GObject *object);
static void pango_x_font_finalize (GObject *object);
static PangoFontDescription *pango_x_font_describe (PangoFont *font);
static PangoCoverage * pango_x_font_get_coverage (PangoFont *font,
PangoLanguage *language);
static PangoEngineShape * pango_x_font_find_shaper (PangoFont *font,
PangoLanguage *language,
guint32 ch);
static void pango_x_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
static PangoFontMetrics * pango_x_font_get_metrics (PangoFont *font,
PangoLanguage *language);
static PangoFontMap * pango_x_font_get_font_map (PangoFont *font);
static PangoXSubfontInfo * pango_x_find_subfont (PangoFont *font,
PangoXSubfont subfont_index);
static XCharStruct * pango_x_get_per_char (PangoFont *font,
PangoXSubfontInfo *subfont,
guint16 char_index);
static gboolean pango_x_find_glyph (PangoFont *font,
PangoGlyph glyph,
PangoXSubfontInfo **subfont_return,
XCharStruct **charstruct_return);
static XFontStruct * pango_x_get_font_struct (PangoFont *font,
PangoXSubfontInfo *info);
static void pango_x_get_item_properties (PangoItem *item,
PangoUnderline *uline,
PangoAttrColor *fg_color,
gboolean *fg_set,
PangoAttrColor *bg_color,
gboolean *bg_set);
static inline PangoXSubfontInfo *
pango_x_find_subfont (PangoFont *font,
PangoXSubfont subfont_index)
{
PangoXFont *xfont = (PangoXFont *)font;
if (subfont_index < 1 || subfont_index > xfont->n_subfonts)
return NULL;
return xfont->subfonts[subfont_index-1];
}
static void
pango_x_make_font_struct (PangoFont *font, PangoXSubfontInfo *info)
{
PangoXFont *xfont = (PangoXFont *)font;
PangoXFontCache *cache;
cache = pango_x_font_map_get_font_cache (xfont->fontmap);
info->font_struct = pango_x_font_cache_load (cache, info->xlfd);
if (!info->font_struct)
{
g_warning ("Cannot load font for XLFD '%s\n", info->xlfd);
/* Prevent a segfault, but probably not much more */
info->font_struct = pango_x_font_cache_load (cache, "fixed");
}
info->is_1byte = (info->font_struct->min_byte1 == 0 && info->font_struct->max_byte1 == 0);
info->range_byte1 = info->font_struct->max_byte1 - info->font_struct->min_byte1 + 1;
info->range_byte2 = info->font_struct->max_char_or_byte2 - info->font_struct->min_char_or_byte2 + 1;
}
static inline XFontStruct *
pango_x_get_font_struct (PangoFont *font, PangoXSubfontInfo *info)
{
if (!info->font_struct)
pango_x_make_font_struct (font, info);
return info->font_struct;
}
static void
free_context_info (PangoXContextInfo *info)
{
g_slice_free (PangoXContextInfo, info);
}
static PangoXContextInfo *
get_context_info (PangoContext *context)
{
PangoXContextInfo *info;
static GQuark quark = 0;
if (G_UNLIKELY (!quark))
quark = g_quark_from_static_string ("pango-x-info");
info = g_object_get_qdata (G_OBJECT (context), quark);
if (G_UNLIKELY (!info))
{
info = g_slice_new (PangoXContextInfo);
info->get_gc_func = NULL;
info->free_gc_func = NULL;
g_object_set_qdata_full (G_OBJECT (context),
quark,
info, (GDestroyNotify)free_context_info);
}
return info;
}
/**
* pango_x_get_context:
* @display: an X display (As returned by XOpenDisplay().)
*
* Retrieves a #PangoContext appropriate for rendering with X fonts on the
* given display.
*
* Return value: the new #PangoContext.
*
* Deprecated: 1.22: Use pango_x_font_map_for_display() followed by
* pango_font_map_create_context() instead.
**/
PangoContext *
pango_x_get_context (Display *display)
{
return pango_font_map_create_context (pango_x_font_map_for_display (display));
}
/**
* pango_x_context_set_funcs:
* @context: a #PangoContext.
* @get_gc_func: function called to create a new GC for a given color.
* @free_gc_func: function called to free a GC created with @get_gc_func.
*
* Sets the functions that will be used to get GC's in various colors when
* rendering layouts with this context.
**/
void
pango_x_context_set_funcs (PangoContext *context,
PangoGetGCFunc get_gc_func,
PangoFreeGCFunc free_gc_func)
{
PangoXContextInfo *info;
g_return_if_fail (context != NULL);
info = get_context_info (context);
info->get_gc_func = get_gc_func;
info->free_gc_func = free_gc_func;
}
static GType
pango_x_font_get_type (void)
{
static GType object_type = 0;
if (G_UNLIKELY (!object_type))
{
const GTypeInfo object_info =
{
sizeof (PangoXFontClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) pango_x_font_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (PangoXFont),
0, /* n_preallocs */
(GInstanceInitFunc) pango_x_font_init,
NULL /* value_table */
};
object_type = g_type_register_static (PANGO_TYPE_FONT,
I_("PangoXFont"),
&object_info, 0);
}
return object_type;
}
static void
pango_x_font_init (PangoXFont *xfont)
{
xfont->subfonts_by_charset = g_hash_table_new (g_str_hash, g_str_equal);
xfont->n_subfonts = 0;
xfont->max_subfonts = 1;
xfont->subfonts = g_new (PangoXSubfontInfo *, xfont->max_subfonts);
xfont->metrics_by_lang = NULL;
xfont->size = -1;
xfont->xface = NULL;
}
static void
pango_x_font_class_init (PangoXFontClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
PangoFontClass *font_class = PANGO_FONT_CLASS (class);
parent_class = g_type_class_peek_parent (class);
object_class->finalize = pango_x_font_finalize;
object_class->dispose = pango_x_font_dispose;
font_class->describe = pango_x_font_describe;
font_class->get_coverage = pango_x_font_get_coverage;
font_class->get_glyph_extents = pango_x_font_get_glyph_extents;
font_class->get_metrics = pango_x_font_get_metrics;
font_class->get_font_map = pango_x_font_get_font_map;
}
PangoXFont *
pango_x_font_new (PangoFontMap *fontmap, const char *spec, int size)
{
PangoXFont *result;
g_return_val_if_fail (fontmap != NULL, NULL);
g_return_val_if_fail (spec != NULL, NULL);
result = g_object_new (PANGO_TYPE_X_FONT, NULL);
g_assert (result->fontmap == NULL);
result->fontmap = fontmap;
g_object_add_weak_pointer (G_OBJECT (result->fontmap), (gpointer *) (gpointer) &result->fontmap);
result->display = pango_x_fontmap_get_display (fontmap);
result->fonts = g_strsplit(spec, ",", -1);
for (result->n_fonts = 0; result->fonts[result->n_fonts]; result->n_fonts++)
; /* Nothing */
result->size = size;
return result;
}
/**
* pango_x_load_font:
* @display: the X display.
* @spec: a comma-separated list of XLFD's.
*
* Loads up a logical font based on a "fontset" style text
* specification. This is not remotely useful (Pango API's generally
* work in terms of #PangoFontDescription) and the result may not
* work correctly in all circumstances. Use of this function should
* be avoided.
*
* Returns: a new #PangoFont.
*/
PangoFont *
pango_x_load_font (Display *display,
const char *spec)
{
PangoXFont *result;
g_return_val_if_fail (display != NULL, NULL);
g_return_val_if_fail (spec != NULL, NULL);
result = pango_x_font_new (pango_x_font_map_for_display (display), spec, -1);
return (PangoFont *)result;
}
#define FLUSH \
G_STMT_START { \
if (charcount) \
{ \
XDrawString16 (display, d, gc, \
glyph_x0, glyph_y0, \
xcharbuffer, charcount); \
charcount = 0; \
} \
} G_STMT_END
/**
* pango_x_render:
* @display: the X display.
* @d: the drawable on which to draw string.
* @gc: the graphics context.
* @font: the font in which to draw the string.
* @glyphs: the glyph string to draw.
* @x: the x position of start of string (in pixels).
* @y: the y position of baseline (in pixels).
*
* Renders a #PangoGlyphString onto an X drawable.
*/
void
pango_x_render (Display *display,
Drawable d,
GC gc,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y)
{
Font old_fid = None;
XFontStruct *fs;
int i;
int x_off = 0;
/*
* We collect the characters in this buffer as long as the font does not
* change. At that time, or when the buffer runs full, or at the end,
* then we empty the buffer.
*/
XChar2b xcharbuffer[1000];
int glyph_x0 = 0, expected_x = 0; /* x/y initializations are to quiet GCC */
int glyph_y0 = 0;
int charcount = 0;
g_return_if_fail (display != NULL);
g_return_if_fail (glyphs != NULL);
for (i=0; i<glyphs->num_glyphs; i++)
{
PangoGlyph glyph = glyphs->glyphs[i].glyph;
int glyph_x = x + PANGO_PIXELS (x_off + glyphs->glyphs[i].geometry.x_offset);
int glyph_y = y + PANGO_PIXELS (glyphs->glyphs[i].geometry.y_offset);
/* Clip glyphs into the X coordinate range; we really
* want to clip glyphs with an ink rect outside the
* [0,32767] x [0,32767] rectangle but looking up
* the ink rect here would be a noticeable speed hit.
* This is close enough.
*/
if (!(glyph != PANGO_GLYPH_EMPTY &&
glyph_x >= -16384 && glyph_x <= 32767 &&
glyph_y >= -16384 && glyph_y <= 32767))
goto next_glyph;
if (G_LIKELY ((glyph & PANGO_GLYPH_UNKNOWN_FLAG) == 0))
{
guint16 index = PANGO_X_GLYPH_INDEX (glyph);
guint16 subfont_index = PANGO_X_GLYPH_SUBFONT (glyph);
PangoXSubfontInfo *subfont;
subfont = pango_x_find_subfont (font, subfont_index);
if (subfont)
{
fs = pango_x_get_font_struct (font, subfont);
if (!fs)
continue;
if (fs->fid != old_fid)
{
FLUSH;
XSetFont (display, gc, fs->fid);
old_fid = fs->fid;
}
if (charcount == G_N_ELEMENTS (xcharbuffer) ||
(charcount > 0 && (glyph_y != glyph_y0 ||
glyph_x != expected_x)))
FLUSH;
if (charcount == 0)
{
glyph_x0 = glyph_x;
glyph_y0 = glyph_y;
}
xcharbuffer[charcount].byte1 = index / 256;
xcharbuffer[charcount].byte2 = index % 256;
expected_x = glyph_x + XTextWidth16 (fs, &xcharbuffer[charcount], 1);
charcount++;
} else
goto unknown_glyph;
} else {
PangoFontMetrics *metrics;
int x1, y1, x2, y2; /* rectangle the character should go inside. */
int baseline;
int stroke_thick;
gunichar wc;
gboolean invalid_input;
unknown_glyph:
FLUSH;
if (font)
metrics = pango_font_get_metrics (font, NULL);
else
metrics = NULL;
if (metrics)
{
y1 = glyph_y - PANGO_PIXELS (metrics->ascent);
y2 = y1 + PANGO_PIXELS (metrics->ascent + metrics->descent);
}
else
{
y2 = glyph_y;
y1 = y2 - PANGO_UNKNOWN_GLYPH_HEIGHT;
}
x1 = glyph_x;
x2 = x1 + PANGO_PIXELS (glyphs->glyphs[i].geometry.width);
baseline = glyph_y;
stroke_thick = MAX ((int) (0.5 + 0.025 * (y2 - y1)), 1);
if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
wc = glyph & ~PANGO_GLYPH_UNKNOWN_FLAG;
else
wc = 0;
invalid_input = glyph == PANGO_GLYPH_INVALID_INPUT || wc > 0x10FFFF;
switch (wc)
{
case '\n':
case '\r':
case 0x2028: /* Line separator */
case 0x2029: /* Paragraph separator */
{
/* Draw a carriage-return thingy */
PangoRectangle up_stroke;
PangoRectangle across_stroke;
int hborder = (x2 - x1) * 0.1;
int arrow_height = 0.25 * (y2 - y1);
int top_border = (y2 - y1) * 0.25;
int arrow_x, arrow_width, tmp_height;
/* Draw the arrow-head */
tmp_height = (stroke_thick % 2 == 0) ? 2 : 1; /* Starting height */
arrow_height = 2 * ((1 + arrow_height - tmp_height) / 2) + tmp_height; /* Force symmetry */
arrow_width = 2 + arrow_height - tmp_height;
for (arrow_x = x1 + hborder; arrow_x < x1 + hborder + arrow_width; arrow_x++)
{
XDrawLine (display, d, gc,
arrow_x,
baseline - stroke_thick + (stroke_thick - tmp_height) / 2,
arrow_x,
baseline - stroke_thick + (stroke_thick - tmp_height) / 2 + tmp_height - 1);
if ((arrow_x - x1 - hborder) % 2 == 1)
tmp_height += 2;
}
across_stroke.x = arrow_x;
across_stroke.width = x2 - hborder - arrow_x - stroke_thick;
across_stroke.y = baseline - stroke_thick;
across_stroke.height = stroke_thick;
XFillRectangle (display, d, gc,
across_stroke.x, across_stroke.y,
across_stroke.width, across_stroke.height);
up_stroke.x = across_stroke.x + across_stroke.width;
up_stroke.width = stroke_thick;
up_stroke.y = y1 + top_border;
up_stroke.height = baseline - up_stroke.y;
XFillRectangle (display, d, gc,
up_stroke.x, up_stroke.y,
up_stroke.width, up_stroke.height);
}
break;
default:
{
/* Perhaps we should draw the box-with-numbers as in the
* other backends, though we have no guarantee of having
* an appropriate size of font. Right now, we just
* draw an empty box. (To draw the box-with-numbers.
* the backends would have to be changed to use
* pango_x_font_get_unknown_glyph() rather than
* pango_x_get_unknown_glyph().
*/
int xspace = MAX ((int) (0.5 + 0.1 * (x2 - x1)), 1);
int yspace = MAX ((int) (0.5 + 0.1 * (y2 - y1)), 1);
x1 += xspace;
x2 -= xspace;
y1 += yspace;
y2 -= yspace;
XFillRectangle (display, d, gc,
x1, y1,
x2 - x1, stroke_thick);
XFillRectangle (display, d, gc,
x1, y1 + stroke_thick,
stroke_thick, y2 - y1 - 2 * stroke_thick);
XFillRectangle (display, d, gc,
x2 - stroke_thick, y1 + stroke_thick,
stroke_thick, y2 - y1 - 2 * stroke_thick);
XFillRectangle (display, d, gc,
x1, y2 - stroke_thick,
x2 - x1, stroke_thick);
if (invalid_input)
{
XDrawLine (display, d, gc,
x1, y1,
x2-1, y2-1);
XDrawLine (display, d, gc,
x2-1, y1,
x1, y2-1);
}
break;
}
}
pango_font_metrics_unref (metrics);
}
next_glyph:
x_off += glyphs->glyphs[i].geometry.width;
}
FLUSH;
}
#undef FLUSH
static void
pango_x_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
XCharStruct *cs;
PangoXSubfontInfo *subfont;
if (glyph == PANGO_GLYPH_EMPTY)
{
if (ink_rect)
ink_rect->x = ink_rect->width = ink_rect->y = ink_rect->height = 0;
if (logical_rect)
logical_rect->x = logical_rect->width = logical_rect->y = logical_rect->height = 0;
return;
}
if ((glyph & PANGO_GLYPH_UNKNOWN_FLAG) == 0 && pango_x_find_glyph (font, glyph, &subfont, &cs))
{
if (ink_rect)
{
ink_rect->x = PANGO_SCALE * cs->lbearing;
ink_rect->width = PANGO_SCALE * (cs->rbearing - cs->lbearing);
ink_rect->y = PANGO_SCALE * -cs->ascent;
ink_rect->height = PANGO_SCALE * (cs->ascent + cs->descent);
}
if (logical_rect)
{
logical_rect->x = 0;
logical_rect->width = PANGO_SCALE * cs->width;
logical_rect->y = - PANGO_SCALE * subfont->font_struct->ascent;
logical_rect->height = PANGO_SCALE * (subfont->font_struct->ascent + subfont->font_struct->descent);
}
}
else
{
PangoFontMetrics *metrics;
gunichar wc;
gdouble width_factor;
int w;
if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
wc = glyph & (~PANGO_GLYPH_UNKNOWN_FLAG);
else
wc = 0;
switch (wc)
{
case '\n':
case '\r':
case 0x2028: /* Line separator */
case 0x2029: /* Paragraph separator */
{
#define MAGIC_FACTOR 1.2
/* carriage-return thingy */
width_factor = MAGIC_FACTOR;
break;
}
default:
{
/* Unknown glyph square */
width_factor = 1.0;
}
}
metrics = pango_font_get_metrics (font, NULL);
if (metrics)
{
w = metrics->approximate_char_width * width_factor;
w = PANGO_SCALE * PANGO_PIXELS (w);
if (ink_rect)
{
ink_rect->x = PANGO_SCALE;
ink_rect->width = w - 2 * PANGO_SCALE;
ink_rect->y = - (metrics->ascent - PANGO_SCALE);
ink_rect->height = metrics->ascent + metrics->descent - 2 * PANGO_SCALE;
}
if (logical_rect)
{
logical_rect->x = 0;
logical_rect->width = w;
logical_rect->y = - metrics->ascent;
logical_rect->height = metrics->ascent + metrics->descent;
}
pango_font_metrics_unref (metrics);
}
else
{
if (ink_rect)
ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
if (logical_rect)
logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
}
}
}
static gboolean
get_int_prop (Atom atom,
XFontStruct *fs,
int *val)
{
int i;
*val = 0;
i = 0;
while (i < fs->n_properties)
{
if (fs->properties[i].name == atom)
{
*val = fs->properties[i].card32;
return TRUE;
}
++i;
}
return FALSE;
}
/* Call @func with each glyph resulting from shaping @string with each
* glyph. This duplicates quite a bit of code from pango_itemize. This
* function should die and we should simply add the ability to specify
* particular fonts when itemizing.
*/
static void
itemize_string_foreach (PangoFont *font,
PangoLanguage *language,
const char *str,
void (*func) (PangoFont *font,
PangoGlyphInfo *glyph_info,
gpointer data),
gpointer data)
{
const char *start, *p;
PangoGlyphString *glyph_str = pango_glyph_string_new ();
PangoEngineShape *shaper, *last_shaper;
int last_level;
int i;
guint8 *embedding_levels;
PangoDirection base_dir = PANGO_DIRECTION_LTR;
gboolean finished = FALSE;
embedding_levels = pango_log2vis_get_embedding_levels (str, -1, &base_dir);
last_shaper = NULL;
last_level = 0;
i = 0;
p = start = str;
while (*p || !finished)
{
gunichar wc;
if (*p)
{
wc = g_utf8_get_char (p);
shaper = pango_font_find_shaper (font, language, wc);
}
else
{
finished = TRUE;
shaper = NULL;
}
if (p > start &&
(finished ||
(shaper != last_shaper || last_level != embedding_levels[i])))
{
PangoAnalysis analysis = { NULL };
int j;
analysis.shape_engine = last_shaper;
analysis.font = font;
analysis.language = language;
analysis.level = last_level;
pango_shape (start, p - start, &analysis, glyph_str);
for (j = 0; j < glyph_str->num_glyphs; j++)
(*func) (font, &glyph_str->glyphs[j], data);
start = p;
}
if (!finished)
{
p = g_utf8_next_char (p);
last_shaper = shaper;
last_level = embedding_levels[i];
i++;
}
}
pango_glyph_string_free (glyph_str);
g_free (embedding_levels);
}
/* Get composite font metrics for all subfonts in list
*/
static void
get_font_metrics_from_subfonts (PangoFont *font,
GSList *subfonts,
PangoFontMetrics *metrics)
{
PangoXFont *xfont = (PangoXFont *)font;
GSList *tmp_list = subfonts;
gboolean first = TRUE;
int total_avg_widths = 0;
int n_avg_widths = 0;
Atom avg_width_atom;
avg_width_atom = pango_x_fontmap_atom_from_name (xfont->fontmap,
"AVERAGE_WIDTH");
metrics->ascent = 0;
metrics->descent = 0;
while (tmp_list)
{
PangoXSubfontInfo *subfont = pango_x_find_subfont (font, GPOINTER_TO_UINT (tmp_list->data));
if (subfont)
{
XFontStruct *fs = pango_x_get_font_struct (font, subfont);
gint avg_width = 0;
if (fs)
{
if (first)
{
metrics->ascent = fs->ascent * PANGO_SCALE;
metrics->descent = fs->descent * PANGO_SCALE;
first = FALSE;
}
else
{
metrics->ascent = MAX (fs->ascent * PANGO_SCALE, metrics->ascent);
metrics->descent = MAX (fs->descent * PANGO_SCALE, metrics->descent);
}
if (get_int_prop (avg_width_atom, fs, &avg_width))
{
/* convert decipoints --> Pango units.
* Resolution is in (points * PANGO_SCALE) / pixel,
* avg_width in decipoints.
* We want pixels * PANGO_SCALE
*/
/* Convert to points * PANGO_SCALE */
avg_width *= PANGO_SCALE / (double) 10.0;
/* Convert to pixels * PANGO_SCALE */
avg_width *= (PANGO_SCALE / PANGO_X_FONT_MAP (PANGO_X_FONT (font)->fontmap)->resolution);
}
else
{
avg_width = PANGO_SCALE * ((fs->min_bounds.width + fs->max_bounds.width) / 2);
}
}
if (avg_width)
{
total_avg_widths += avg_width;
n_avg_widths += 1;
}
}
else
g_warning ("Invalid subfont %d in get_font_metrics_from_subfonts", GPOINTER_TO_UINT (tmp_list->data));
tmp_list = tmp_list->next;
}
/* This is pretty darn bogus. */
if (n_avg_widths)
metrics->approximate_char_width = total_avg_widths / n_avg_widths;
else
metrics->approximate_char_width = PANGO_UNKNOWN_GLYPH_WIDTH * PANGO_SCALE;
if (metrics->ascent + metrics->descent == 0)
{
metrics->ascent = PANGO_UNKNOWN_GLYPH_HEIGHT * PANGO_SCALE;
metrics->descent = 0;
}
}
static void
get_subfonts_foreach (PangoFont *font,
PangoGlyphInfo *glyph_info,
gpointer data)
{
GSList **subfonts = data;
PangoGlyph glyph = glyph_info->glyph;
PangoXSubfont subfont;
if (glyph == PANGO_GLYPH_EMPTY)
return;
/* Use an arbitrary subfont for unknown glyphs...*/
if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
{
if (((PangoXFont *)font)->n_subfonts > 0)
glyph = PANGO_X_MAKE_GLYPH (1, 0);
else
return;
}
subfont = PANGO_X_GLYPH_SUBFONT (glyph);
if (!g_slist_find (*subfonts, GUINT_TO_POINTER ((guint)subfont)))
*subfonts = g_slist_prepend (*subfonts, GUINT_TO_POINTER ((guint)subfont));
}
/* Get composite font metrics for all subfonts resulting from shaping
* string str with the given font
*/
static void
get_font_metrics_from_string (PangoFont *font,
PangoLanguage *language,
const char *str,
PangoFontMetrics *metrics)
{
GSList *subfonts = NULL;
itemize_string_foreach (font, language, str, get_subfonts_foreach, &subfonts);
get_font_metrics_from_subfonts (font, subfonts, metrics);
g_slist_free (subfonts);
}
static void
average_width_foreach (PangoFont *font G_GNUC_UNUSED,
PangoGlyphInfo *glyph_info,
gpointer data)
{
int *width = data;
*width += glyph_info->geometry.width;
}
/* Get composite font metrics for all subfonts resulting from shaping
* string str with the given font
*/
static gdouble
get_total_width_for_string (PangoFont *font,
PangoLanguage *language,
const char *str)
{
int width = 0;
itemize_string_foreach (font, language, str, average_width_foreach, &width);
return width;
}
static PangoFontMetrics *
pango_x_font_get_metrics (PangoFont *font,
PangoLanguage *language)
{
PangoXMetricsInfo *info = NULL; /* Quiet gcc */
PangoXFont *xfont = (PangoXFont *)font;
GSList *tmp_list;
const char *sample_str = pango_language_get_sample_string (language);
tmp_list = xfont->metrics_by_lang;
while (tmp_list)
{
info = tmp_list->data;
if (info->sample_str == sample_str) /* We _don't_ need strcmp */
break;
tmp_list = tmp_list->next;
}
if (!tmp_list)
{
PangoFontMetrics *metrics;
info = g_slice_new0 (PangoXMetricsInfo);
xfont->metrics_by_lang = g_slist_prepend (xfont->metrics_by_lang, info);
info->sample_str = sample_str;
metrics = pango_font_metrics_new ();
get_font_metrics_from_string (font, language, sample_str, metrics);
metrics->approximate_digit_width = get_total_width_for_string (font, language, "0123456789") / 10;
info->metrics = metrics;
}
return pango_font_metrics_ref (info->metrics);
}
static PangoFontMap *
pango_x_font_get_font_map (PangoFont *font)
{
PangoXFont *xfont = (PangoXFont *)font;
return xfont->fontmap;
}
/* Compare the tail of a to b */
static gboolean
match_end (const char *a, const char *b)
{
size_t len_a = strlen (a);
size_t len_b = strlen (b);
if (len_b > len_a)
return FALSE;
else
return (strcmp (a + len_a - len_b, b) == 0);
}
/* Substitute in a charset into an XLFD. Return the
* (g_malloc'd) new name, or %NULL if the XLFD cannot
* match the charset
*/
static char *
name_for_charset (char *xlfd, char *charset)
{
char *p;
char *dash_charset = g_strconcat ("-", charset, NULL);
char *result = NULL;
int ndashes = 0;
for (p = xlfd; *p; p++)
if (*p == '-')
ndashes++;
if (ndashes == 14) /* Complete XLFD */
{
if (match_end (xlfd, "-*-*"))
{
result = g_malloc (strlen (xlfd) - 4 + strlen (dash_charset) + 1);
strncpy (result, xlfd, strlen (xlfd) - 4);
strcpy (result + strlen (xlfd) - 4, dash_charset);
}
if (match_end (xlfd, dash_charset))
result = g_strdup (xlfd);
}
else if (ndashes == 13)
{
if (match_end (xlfd, "-*"))
{
result = g_malloc (strlen (xlfd) - 2 + strlen (dash_charset) + 1);
strncpy (result, xlfd, strlen (xlfd) - 2);
strcpy (result + strlen (xlfd) - 2, dash_charset);
}
if (match_end (xlfd, dash_charset))
result = g_strdup (xlfd);
}
else
{
if (match_end (xlfd, "*"))
{
result = g_malloc (strlen (xlfd) + strlen (dash_charset) + 1);
strcpy (result, xlfd);
strcpy (result + strlen (xlfd), dash_charset);
}
if (match_end (xlfd, dash_charset))
result = g_strdup (xlfd);
}
g_free (dash_charset);
return result;
}
static PangoXSubfont
pango_x_insert_subfont (PangoFont *font, const char *xlfd)
{
PangoXFont *xfont = (PangoXFont *)font;
PangoXSubfontInfo *info;
info = g_slice_new (PangoXSubfontInfo);
info->xlfd = g_strdup (xlfd);
info->font_struct = NULL;
xfont->n_subfonts++;
if (xfont->n_subfonts > xfont->max_subfonts)
{
xfont->max_subfonts *= 2;
xfont->subfonts = g_renew (PangoXSubfontInfo *, xfont->subfonts, xfont->max_subfonts);
}
xfont->subfonts[xfont->n_subfonts - 1] = info;
return xfont->n_subfonts;
}
/**
* pango_x_list_subfonts:
* @font: a #PangoFont.
* @charsets: the charsets to list subfonts for.
* @n_charsets: the number of charsets in @charsets.
* @subfont_ids: location to store a pointer to an array of subfont IDs for each found subfont;
* the result must be freed using g_free().
* @subfont_charsets: location to store a pointer to an array of subfont IDs for each found subfont;
* the result must be freed using g_free().
*
* Lists the subfonts of a given font. The result is ordered first by charset,
* and then within each charset, by the order of fonts in the font specification.
*
* Return value: length of the arrays stored in @subfont_ids and
* @subfont_charsets.
**/
int
pango_x_list_subfonts (PangoFont *font,
char **charsets,
int n_charsets,
PangoXSubfont **subfont_ids,
int **subfont_charsets)
{
PangoXFont *xfont = (PangoXFont *)font;
PangoXSubfont **subfont_lists;
PangoFontMap *fontmap;
int i, j;
int n_subfonts = 0;
g_return_val_if_fail (font != NULL, 0);
g_return_val_if_fail (n_charsets == 0 || charsets != NULL, 0);
fontmap = pango_x_font_map_for_display (xfont->display);
subfont_lists = g_new (PangoXSubfont *, n_charsets);
for (j=0; j<n_charsets; j++)
{
subfont_lists[j] = g_hash_table_lookup (xfont->subfonts_by_charset, charsets[j]);
if (!subfont_lists[j])
{
subfont_lists[j] = g_new (PangoXSubfont, xfont->n_fonts);
for (i = 0; i < xfont->n_fonts; i++)
{
PangoXSubfont subfont = 0;
char *xlfd;
if (xfont->size == -1)
{
xlfd = name_for_charset (xfont->fonts[i], charsets[j]);
if (xlfd)
{
int count;
char **names = XListFonts (xfont->display, xlfd, 1, &count);
if (count > 0)
subfont = pango_x_insert_subfont (font, names[0]);
XFreeFontNames (names);
g_free (xlfd);
}
}
else
{
xlfd = pango_x_make_matching_xlfd (fontmap, xfont->fonts[i], charsets[j], xfont->size);
if (xlfd)
{
subfont = pango_x_insert_subfont (font, xlfd);
g_free (xlfd);
}
}
subfont_lists[j][i] = subfont;
}
g_hash_table_insert (xfont->subfonts_by_charset, g_strdup (charsets[j]), subfont_lists[j]);
}
for (i = 0; i < xfont->n_fonts; i++)
if (subfont_lists[j][i])
n_subfonts++;
}
*subfont_ids = g_new (PangoXSubfont, n_subfonts);
*subfont_charsets = g_new (int, n_subfonts);
n_subfonts = 0;
for (j=0; j<n_charsets; j++)
for (i=0; i<xfont->n_fonts; i++)
if (subfont_lists[j][i])
{
(*subfont_ids)[n_subfonts] = subfont_lists[j][i];
(*subfont_charsets)[n_subfonts] = j;
n_subfonts++;
}
g_free (subfont_lists);
return n_subfonts;
}
/**
* pango_x_has_glyph:
* @font: a #PangoFont which must be from the X backend.
* @glyph: the index of a glyph in the font. (Formed
* using the #PANGO_X_MAKE_GLYPH macro)
*
* Checks if the given glyph is present in a X font.
*
* Return value: %TRUE if the glyph is present.
**/
gboolean
pango_x_has_glyph (PangoFont *font,
PangoGlyph glyph)
{
PangoXSubfontInfo *subfont;
XCharStruct *cs;
guint16 char_index = PANGO_X_GLYPH_INDEX (glyph);
guint16 subfont_index = PANGO_X_GLYPH_SUBFONT (glyph);
subfont = pango_x_find_subfont (font, subfont_index);
if (!subfont)
return FALSE;
cs = pango_x_get_per_char (font, subfont, char_index);
if (cs && (cs->lbearing != cs->rbearing || cs->width != 0))
return TRUE;
else
return FALSE;
}
/**
* pango_x_font_subfont_xlfd:
* @font: a #PangoFont which must be from the X backend.
* @subfont_id: the id of a subfont within the font.
*
* Determines the X Logical Font Description for the specified
* subfont.
*
* Return value: A newly-allocated string containing the XLFD for the
* subfont. This string must be freed with g_free().
**/
char *
pango_x_font_subfont_xlfd (PangoFont *font,
PangoXSubfont subfont_id)
{
PangoXSubfontInfo *subfont;
g_return_val_if_fail (font != NULL, NULL);
g_return_val_if_fail (PANGO_X_IS_FONT (font), NULL);
subfont = pango_x_find_subfont (font, subfont_id);
if (!subfont)
{
g_warning ("pango_x_font_subfont_xlfd: Invalid subfont_id specified");
return NULL;
}
return g_strdup (subfont->xlfd);
}
static void
pango_x_font_dispose (GObject *object)
{
PangoXFont *xfont = PANGO_X_FONT (object);
/* If the font is not already in the freed-fonts cache, add it,
* if it is already there, do nothing and the font will be
* freed.
*/
if (!xfont->in_cache && xfont->fontmap)
pango_x_fontmap_cache_add (xfont->fontmap, xfont);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
subfonts_foreach (gpointer key, gpointer value, gpointer data G_GNUC_UNUSED)
{
g_free (key);
g_free (value);
}
static void
free_metrics_info (PangoXMetricsInfo *info)
{
pango_font_metrics_unref (info->metrics);
g_slice_free (PangoXMetricsInfo, info);
}
static void
pango_x_font_finalize (GObject *object)
{
PangoXFont *xfont = (PangoXFont *)object;
PangoXFontCache *cache = pango_x_font_map_get_font_cache (xfont->fontmap);
int i;
for (i=0; i<xfont->n_subfonts; i++)
{
PangoXSubfontInfo *info = xfont->subfonts[i];
g_free (info->xlfd);
if (info->font_struct)
pango_x_font_cache_unload (cache, info->font_struct);
g_slice_free (PangoXSubfontInfo, info);
}
g_free (xfont->subfonts);
g_hash_table_foreach (xfont->subfonts_by_charset, subfonts_foreach, NULL);
g_hash_table_destroy (xfont->subfonts_by_charset);
g_slist_foreach (xfont->metrics_by_lang, (GFunc)free_metrics_info, NULL);
g_slist_free (xfont->metrics_by_lang);
if (xfont->xface)
pango_x_face_remove (xfont->xface, (PangoFont *)xfont);
g_assert (xfont->fontmap != NULL);
g_object_remove_weak_pointer (G_OBJECT (xfont->fontmap), (gpointer *) (gpointer) &xfont->fontmap);
xfont->fontmap = NULL;
g_strfreev (xfont->fonts);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static PangoFontDescription *
pango_x_font_describe (PangoFont *font)
{
/* FIXME: this doesn't work for fonts from pango_x_font_load()
*/
PangoXFont *xfont = (PangoXFont *)font;
if (xfont->xface)
{
PangoFontDescription *desc = pango_font_face_describe (PANGO_FONT_FACE (xfont->xface));
pango_font_description_set_size (desc, xfont->size);
return desc;
}
else
return NULL;
}
PangoMap *
pango_x_get_shaper_map (PangoLanguage *language)
{
static guint engine_type_id = 0;
static guint render_type_id = 0;
if (engine_type_id == 0)
{
engine_type_id = g_quark_from_static_string (PANGO_ENGINE_TYPE_SHAPE);
render_type_id = g_quark_from_static_string (PANGO_RENDER_TYPE_X);
}
return pango_find_map (language, engine_type_id, render_type_id);
}
static PangoCoverage *
pango_x_font_get_coverage (PangoFont *font,
PangoLanguage *language)
{
PangoXFont *xfont = (PangoXFont *)font;
return pango_x_face_get_coverage (xfont->xface, font, language);
}
static PangoEngineShape *
pango_x_font_find_shaper (PangoFont *font G_GNUC_UNUSED,
PangoLanguage *language,
guint32 ch)
{
PangoMap *shape_map = NULL;
PangoScript script;
shape_map = pango_x_get_shaper_map (language);
script = pango_script_for_unichar (ch);
return (PangoEngineShape *)pango_map_get_engine (shape_map, script);
}
/* Utility functions */
static XCharStruct *
pango_x_get_per_char (PangoFont *font,
PangoXSubfontInfo *subfont,
guint16 char_index)
{
XFontStruct *fs;
int index;
int byte1;
int byte2;
fs = pango_x_get_font_struct (font, subfont);
if (!fs)
return NULL;
if (subfont->is_1byte)
{
index = (int)char_index - fs->min_char_or_byte2;
if (index < 0 || index >= subfont->range_byte2)
return NULL;
}
else
{
byte1 = (int)(char_index / 256) - fs->min_byte1;
if (byte1 < 0 || byte1 >= subfont->range_byte1)
return NULL;
byte2 = (int)(char_index % 256) - fs->min_char_or_byte2;
if (byte2 < 0 || byte2 >= subfont->range_byte2)
return NULL;
index = byte1 * subfont->range_byte2 + byte2;
}
if (fs->per_char)
return &fs->per_char[index];
else
return &fs->min_bounds;
}
static gboolean
pango_x_find_glyph (PangoFont *font,
PangoGlyph glyph,
PangoXSubfontInfo **subfont_return,
XCharStruct **charstruct_return)
{
PangoXSubfontInfo *subfont;
XCharStruct *cs;
guint16 char_index = PANGO_X_GLYPH_INDEX (glyph);
guint16 subfont_index = PANGO_X_GLYPH_SUBFONT (glyph);
subfont = pango_x_find_subfont (font, subfont_index);
if (!subfont)
return FALSE;
cs = pango_x_get_per_char (font, subfont, char_index);
if (cs && (cs->lbearing != cs->rbearing || cs->width != 0))
{
if (subfont_return)
*subfont_return = subfont;
if (charstruct_return)
*charstruct_return = cs;
return TRUE;
}
else
return FALSE;
}
/**
* pango_x_get_unknown_glyph:
* @font: a #PangoFont.
*
* Returns the index of a glyph suitable for drawing unknown characters;
* you should generally use PANGO_GET_UNKNOWN_GLYPH() instead,
* since that may return a glyph that provides a better representation
* of a particular char. (E.g., by showing hex digits, or a glyph
* representative of a certain Unicode range.)
*
* Return value: a glyph index into @font.
**/
PangoGlyph
pango_x_get_unknown_glyph (PangoFont *font G_GNUC_UNUSED)
{
return PANGO_GET_UNKNOWN_GLYPH (0);
}
/**
* pango_x_render_layout_line:
* @display: the X display.
* @drawable: the drawable on which to draw.
* @gc: GC to use for uncolored drawing.
* @line: a #PangoLayoutLine.
* @x: the x position of start of string (in pixels).
* @y: the y position of baseline (in pixels).
*
* Renders a #PangoLayoutLine onto an X drawable.
*/
void
pango_x_render_layout_line (Display *display,
Drawable drawable,
GC gc,
PangoLayoutLine *line,
int x,
int y)
{
GSList *tmp_list = line->runs;
PangoRectangle overall_rect;
PangoRectangle logical_rect;
PangoRectangle ink_rect;
PangoContext *context = pango_layout_get_context (line->layout);
PangoXContextInfo *info = get_context_info (context);
int x_off = 0;
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;
GC fg_gc;
tmp_list = tmp_list->next;
pango_x_get_item_properties (run->item, &uline, &fg_color, &fg_set, &bg_color, &bg_set);
if (fg_set && info->get_gc_func)
fg_gc = info->get_gc_func (context, &fg_color.color, gc);
else
fg_gc = gc;
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 && info->get_gc_func)
{
GC bg_gc = info->get_gc_func (context, &bg_color.color, gc);
XFillRectangle (display, drawable, bg_gc,
x + (x_off + logical_rect.x) / PANGO_SCALE,
y + overall_rect.y / PANGO_SCALE,
logical_rect.width / PANGO_SCALE,
overall_rect.height / PANGO_SCALE);
if (info->free_gc_func)
info->free_gc_func (context, bg_gc);
}
pango_x_render (display, drawable, fg_gc, run->item->analysis.font, run->glyphs,
x + x_off / PANGO_SCALE, y);
switch (uline)
{
case PANGO_UNDERLINE_NONE:
break;
case PANGO_UNDERLINE_DOUBLE:
XDrawLine (display, 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:
XDrawLine (display, 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_ERROR:
{
int point_x;
int counter = 0;
int end_x = x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE;
for (point_x = x + PANGO_PIXELS (x_off + ink_rect.x) - 1;
point_x <= end_x;
point_x += 2)
{
if (counter)
XDrawLine (display, drawable, gc,
point_x, y + 2, MIN (point_x + 1, end_x), y + 2);
else
XDrawLine (display, drawable, gc,
point_x, y + 3, MIN (point_x + 1, end_x), y + 3);
counter = (counter + 1) % 2;
}
}
break;
case PANGO_UNDERLINE_LOW:
XDrawLine (display, 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 && info->get_gc_func && info->free_gc_func)
info->free_gc_func (context, fg_gc);
x_off += logical_rect.width;
}
}
/**
* pango_x_render_layout:
* @display: the X display.
* @drawable: the drawable on which to draw.
* @gc: GC to use for uncolored drawing.
* @layout: a #PangoLayout.
* @x: the x position of the left of the layout (in pixels).
* @y: the y position of the top of the layout (in pixels).
*
* Renders a #PangoLayout onto an X drawable.
*/
void
pango_x_render_layout (Display *display,
Drawable drawable,
GC gc,
PangoLayout *layout,
int x,
int y)
{
PangoLayoutIter *iter;
g_return_if_fail (display != NULL);
g_return_if_fail (PANGO_IS_LAYOUT (layout));
iter = pango_layout_get_iter (layout);
do
{
PangoRectangle logical_rect;
PangoLayoutLine *line;
int baseline;
line = pango_layout_iter_get_line_readonly (iter);
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
baseline = pango_layout_iter_get_baseline (iter);
pango_x_render_layout_line (display, drawable, gc,
line,
x + PANGO_PIXELS (logical_rect.x),
y + PANGO_PIXELS (baseline));
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
}
/* This utility function is duplicated here and in pango-layout.c; should it be
* public? Trouble is - what is the appropriate set of properties?
*/
static void
pango_x_get_item_properties (PangoItem *item,
PangoUnderline *uline,
PangoAttrColor *fg_color,
gboolean *fg_set,
PangoAttrColor *bg_color,
gboolean *bg_set)
{
GSList *tmp_list = item->analysis.extra_attrs;
if (fg_set)
*fg_set = FALSE;
if (bg_set)
*bg_set = FALSE;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
switch ((int) 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;
default:
break;
}
tmp_list = tmp_list->next;
}
}
/**
* pango_x_apply_ligatures:
* @font: unused
* @subfont: unused
* @glyphs: unused
* @n_glyphs: unused
* @clusters: unused
*
* Previously did subfont-specific ligation. Now a no-op.
*
* Return value: %FALSE, always.
*/
gboolean
pango_x_apply_ligatures (PangoFont *font G_GNUC_UNUSED,
PangoXSubfont subfont_id G_GNUC_UNUSED,
gunichar **glyphs G_GNUC_UNUSED,
int *n_glyphs G_GNUC_UNUSED,
int **clusters G_GNUC_UNUSED)
{
return FALSE;
}
/**
* pango_x_find_first_subfont:
* @font: A #PangoFont.
* @rfont: A pointer to a #PangoXSubfont.
* @charsets: An array of charsets.
* @n_charsets: The number of charsets in @charsets.
*
* Looks for subfonts with the @charset charset,
* in @font, and puts the first one in *@rfont.
*
* Return value: %TRUE if *@rfont now contains a font.
*/
gboolean
pango_x_find_first_subfont (PangoFont *font,
char **charsets,
int n_charsets,
PangoXSubfont *rfont)
{
int n_subfonts;
gboolean result = FALSE;
PangoXSubfont *subfonts;
int *subfont_charsets;
g_return_val_if_fail (font, 0);
g_return_val_if_fail (charsets, 0);
g_return_val_if_fail (rfont, 0);
n_subfonts = pango_x_list_subfonts (font, charsets, n_charsets,
&subfonts, &subfont_charsets);
if (n_subfonts > 0)
{
*rfont = subfonts[0];
result = TRUE;
}
g_free (subfonts);
g_free (subfont_charsets);
return result;
}
/**
* pango_x_fallback_shape:
* @font: A #PangoFont.
* @glyphs: A pointer to a #PangoGlyphString.
* @text: UTF-8 string.
* @n_chars: Number of UTF-8 seqs in @text.
*
* This is a simple fallback shaper, that can be used
* if no subfont that supports a given script is found.
* For every character in @text, it puts the unknown glyph.
*/
void
pango_x_fallback_shape (PangoFont *font,
PangoGlyphString *glyphs,
const char *text,
int n_chars)
{
PangoGlyph unknown_glyph = pango_x_get_unknown_glyph (font);
PangoRectangle logical_rect;
const char *p;
int i;
g_return_if_fail (font);
g_return_if_fail (glyphs);
g_return_if_fail (text);
g_return_if_fail (n_chars >= 0);
pango_font_get_glyph_extents (font, unknown_glyph, NULL, &logical_rect);
pango_glyph_string_set_size (glyphs, n_chars);
p = text;
for (i = 0; i < n_chars; i++)
{
glyphs->glyphs[i].glyph = unknown_glyph;
glyphs->glyphs[i].geometry.x_offset = 0;
glyphs->glyphs[i].geometry.y_offset = 0;
glyphs->glyphs[i].geometry.width = logical_rect.width;
glyphs->log_clusters[i] = p - text;
p = g_utf8_next_char (p);
}
}
/**
* pango_x_font_get_unknown_glyph:
* @font: a #PangoFont.
* @wc: the Unicode character for which a glyph is needed.
*
* Returns the index of a glyph suitable for drawing @wc as an
* unknown character.
*
* Use PANGO_GET_UNKNOWN_GLYPH() instead.
*
* Return value: a glyph index into @font.
*/
PangoGlyph
pango_x_font_get_unknown_glyph (PangoFont *font G_GNUC_UNUSED,
gunichar wc)
{
return PANGO_GET_UNKNOWN_GLYPH (wc);
}
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