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/* Pango
* shape.c: Convert characters into glyphs.
*
* Copyright (C) 1999 Red Hat Software
*
* 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 "config.h"
#include "pango-impl-utils.h"
#include "pango-glyph.h"
#include "pango-engine-private.h"
#include <string.h>
/**
* pango_shape:
* @text: the text to process
* @length: the length (in bytes) of @text
* @analysis: #PangoAnalysis structure from pango_itemize()
* @glyphs: glyph string in which to store results
*
* Given a segment of text and the corresponding
* #PangoAnalysis structure returned from pango_itemize(),
* convert the characters into glyphs. You may also pass
* in only a substring of the item from pango_itemize().
*/
void
pango_shape (const gchar *text,
gint length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
int i;
int last_cluster;
glyphs->num_glyphs = 0;
if (G_LIKELY (analysis->shape_engine && analysis->font))
{
_pango_engine_shape_shape (analysis->shape_engine, analysis->font,
text, length, analysis, glyphs);
if (G_UNLIKELY (glyphs->num_glyphs == 0))
{
/* If a font has been correctly chosen, but no glyphs are output,
* there's probably something wrong with the shaper, or the font.
*
* Trying to be informative, we print out the font description,
* shaper name, and the text, but to not flood the terminal with
* zillions of the message, we set a flag to only err once per
* font/engine pair.
*
* To do the flag fast, we use the engine qname to qflag the font,
* but also the font description to flag the engine. This is
* supposed to be fast to check, but also avoid writing out
* duplicate warnings when a new PangoFont is created.
*/
GType engine_type = G_OBJECT_TYPE (analysis->shape_engine);
GQuark warned_quark = g_type_qname (engine_type);
if (!g_object_get_qdata (G_OBJECT (analysis->font), warned_quark))
{
PangoFontDescription *desc;
char *font_name;
const char *engine_name;
desc = pango_font_describe (analysis->font);
font_name = pango_font_description_to_string (desc);
pango_font_description_free (desc);
if (!g_object_get_data (G_OBJECT (analysis->shape_engine), font_name))
{
engine_name = g_type_name (engine_type);
if (!engine_name)
engine_name = "(unknown)";
g_warning ("shaping failure, expect ugly output. shape-engine='%s', font='%s', text='%.*s'",
engine_name,
font_name,
length == -1 ? (gint) strlen (text) : length, text);
g_object_set_data_full (G_OBJECT (analysis->shape_engine), font_name,
GINT_TO_POINTER (1), NULL);
}
g_free (font_name);
g_object_set_qdata_full (G_OBJECT (analysis->font), warned_quark,
GINT_TO_POINTER (1), NULL);
}
}
}
else
glyphs->num_glyphs = 0;
if (!glyphs->num_glyphs)
{
PangoEngineShape *fallback_engine = _pango_get_fallback_shaper ();
_pango_engine_shape_shape (fallback_engine, analysis->font,
text, length, analysis, glyphs);
}
/* make sure last_cluster is invalid */
last_cluster = glyphs->log_clusters[0] - 1;
for (i = 0; i < glyphs->num_glyphs; i++)
{
/* Set glyphs[i].attr.is_cluster_start based on log_clusters[]
*/
if (glyphs->log_clusters[i] != last_cluster)
{
glyphs->glyphs[i].attr.is_cluster_start = TRUE;
last_cluster = glyphs->log_clusters[i];
}
else
glyphs->glyphs[i].attr.is_cluster_start = FALSE;
/* Shift glyph if width is negative, and negate width.
* This is useful for rotated font matrices and shouldn't
* harm in normal cases.
*/
if (glyphs->glyphs[i].geometry.width < 0)
{
glyphs->glyphs[i].geometry.width = -glyphs->glyphs[i].geometry.width;
glyphs->glyphs[i].geometry.x_offset += glyphs->glyphs[i].geometry.width;
}
}
}
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