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/* Pango
* glyphstring.c:
*
* 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 <glib.h>
#include <pango-glyph.h>
#include <pango-font.h>
/**
* pango_glyph_string_new:
*
* Create a new PangoGlyphString.
*
* Returns the new PangoGlyphString
*/
PangoGlyphString *
pango_glyph_string_new (void)
{
PangoGlyphString *string = g_new (PangoGlyphString, 1);
string->num_glyphs = 0;
string->space = 0;
string->glyphs = NULL;
string->log_clusters = NULL;
return string;
}
/**
* pango_glyph_string_set_size:
* @string: a PangoGlyphString.
* @new_len: the new length of the string.
*
* Resize a glyph string to the given length.
*/
void
pango_glyph_string_set_size (PangoGlyphString *string, gint new_len)
{
g_return_if_fail (new_len >= 0);
while (new_len > string->space)
{
if (string->space == 0)
string->space = 1;
else
string->space *= 2;
if (string->space < 0)
string->space = G_MAXINT;
}
string->glyphs = g_realloc (string->glyphs, string->space * sizeof (PangoGlyphInfo));
string->log_clusters = g_realloc (string->log_clusters, string->space * sizeof (gint));
string->num_glyphs = new_len;
}
/**
* pango_glyph_string_free:
* @string: a PangoGlyphString.
*
* Free a glyph string and associated storage.
*/
void
pango_glyph_string_free (PangoGlyphString *string)
{
g_free (string->glyphs);
g_free (string->log_clusters);
g_free (string);
}
/**
* pango_glyph_string_extents:
* @glyphs: a #PangoGlyphString
* @font: a #PangoFont
* @ink_rect: rectangle used to store the extents of the glyph string as drawn
* or %NULL to indicate that the result is not needed.
* @logical_rect: rectangle used to store the logical extents of the glyph string
* or %NULL to indicate that the result is not needed.
*
* Compute the logical and ink extents of a glyph string. See the documentation
* for pango_font_get_glyph_extents() for details about the interpretation
* of the rectangles.
*/
void
pango_glyph_string_extents (PangoGlyphString *glyphs,
PangoFont *font,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
int x_pos = 0;
int i;
if (glyphs->num_glyphs == 0)
{
if (ink_rect)
{
ink_rect->x = 0;
ink_rect->y = 0;
ink_rect->width = 0;
ink_rect->height = 0;
}
if (logical_rect)
{
logical_rect->x = 0;
logical_rect->y = 0;
logical_rect->width = 0;
logical_rect->height = 0;
}
return;
}
for (i=0; i<glyphs->num_glyphs; i++)
{
PangoRectangle glyph_ink;
PangoRectangle glyph_logical;
PangoGlyphGeometry *geometry = &glyphs->glyphs[i].geometry;
if (i == 0)
{
pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, ink_rect, logical_rect);
}
else
{
int new_pos;
pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph,
ink_rect ? &glyph_ink : NULL,
logical_rect ? &glyph_logical : NULL);
if (ink_rect)
{
new_pos = MIN (ink_rect->x, x_pos + glyph_ink.x + geometry->x_offset);
ink_rect->width = MAX (ink_rect->x + ink_rect->width,
x_pos + glyph_ink.x + glyph_ink.width + geometry->x_offset) - ink_rect->x;
ink_rect->x = new_pos;
new_pos = MIN (ink_rect->y, glyph_ink.y + geometry->y_offset);
ink_rect->height = MAX (ink_rect->y + ink_rect->height,
glyph_ink.y + glyph_ink.height + geometry->y_offset) - ink_rect->y;
ink_rect->y = new_pos;
}
if (logical_rect)
{
new_pos = MIN (logical_rect->x, x_pos + glyph_logical.x + geometry->x_offset);
logical_rect->width = MAX (logical_rect->x + logical_rect->width,
x_pos + glyph_logical.x + glyph_logical.width + geometry->x_offset) - logical_rect->x;
logical_rect->x = new_pos;
new_pos = MIN (logical_rect->y, glyph_logical.y + geometry->y_offset);
logical_rect->height = MAX (logical_rect->y + logical_rect->height,
glyph_logical.y + glyph_logical.height + geometry->y_offset) - logical_rect->y;
logical_rect->y = new_pos;
}
}
x_pos += geometry->width;
}
}
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