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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpText
* Copyright (C) 2002-2003 Sven Neumann <sven@gimp.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#include <pango/pangoft2.h>
#include "text-types.h"
#include "base/pixel-region.h"
#include "base/tile-manager.h"
#include "gimptext.h"
#include "gimptext-private.h"
#include "gimptextlayout.h"
#include "gimptextlayout-render.h"
/* for compatibility with older freetype versions */
#ifndef FT_LOAD_TARGET_MONO
#define FT_LOAD_TARGET_MONO FT_LOAD_MONOCHROME
#endif
/* This file duplicates quite a lot of code from pangoft2.c.
* At some point all this should be folded back into Pango.
*/
static void gimp_text_layout_render_line (GimpTextLayout *layout,
PangoLayoutLine *line,
GimpTextRenderFunc render_func,
gint x,
gint y,
gpointer render_data);
static void gimp_text_layout_render_glyphs (GimpTextLayout *layout,
PangoFont *font,
PangoGlyphString *glyphs,
GimpTextRenderFunc render_func,
gint x,
gint y,
gpointer render_data);
static FT_Int32 gimp_text_layout_render_flags (GimpTextLayout *layout);
static void gimp_text_layout_render_trafo (GimpTextLayout *layout,
FT_Matrix *trafo);
void
gimp_text_layout_render (GimpTextLayout *layout,
GimpTextRenderFunc render_func,
gpointer render_data)
{
PangoLayoutIter *iter;
gint x, y;
g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout));
g_return_if_fail (render_func != NULL);
gimp_text_layout_get_offsets (layout, &x, &y);
x *= PANGO_SCALE;
y *= PANGO_SCALE;
iter = pango_layout_get_iter (layout->layout);
do
{
PangoRectangle rect;
PangoLayoutLine *line;
gint baseline;
line = pango_layout_iter_get_line (iter);
pango_layout_iter_get_line_extents (iter, NULL, &rect);
baseline = pango_layout_iter_get_baseline (iter);
gimp_text_layout_render_line (layout, line,
render_func,
x + rect.x,
y + baseline,
render_data);
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
}
static void
gimp_text_layout_render_line (GimpTextLayout *layout,
PangoLayoutLine *line,
GimpTextRenderFunc render_func,
gint x,
gint y,
gpointer render_data)
{
PangoRectangle rect;
GSList *list;
gint x_off = 0;
for (list = line->runs; list; list = list->next)
{
PangoLayoutRun *run = list->data;
pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
NULL, &rect);
gimp_text_layout_render_glyphs (layout,
run->item->analysis.font, run->glyphs,
render_func,
x + x_off, y,
render_data);
x_off += rect.width;
}
}
static void
gimp_text_layout_render_glyphs (GimpTextLayout *layout,
PangoFont *font,
PangoGlyphString *glyphs,
GimpTextRenderFunc render_func,
gint x,
gint y,
gpointer render_data)
{
PangoGlyphInfo *gi;
FT_Int32 flags;
FT_Matrix trafo;
FT_Vector pos;
gint i;
gint x_position = 0;
flags = gimp_text_layout_render_flags (layout);
gimp_text_layout_render_trafo (layout, &trafo);
for (i = 0, gi = glyphs->glyphs; i < glyphs->num_glyphs; i++, gi++)
{
if (gi->glyph)
{
pos.x = x + x_position + gi->geometry.x_offset;
pos.y = y + gi->geometry.y_offset;
FT_Vector_Transform (&pos, &trafo);
render_func (font, gi->glyph, flags, &trafo,
pos.x, pos.y,
render_data);
}
x_position += glyphs->glyphs[i].geometry.width;
}
}
static FT_Int32
gimp_text_layout_render_flags (GimpTextLayout *layout)
{
GimpText *text = layout->text;
gint flags;
if (text->antialias)
flags = FT_LOAD_NO_BITMAP;
else
flags = FT_LOAD_TARGET_MONO;
if (!text->hinting)
flags |= FT_LOAD_NO_HINTING;
if (text->autohint)
flags |= FT_LOAD_FORCE_AUTOHINT;
return flags;
}
static void
gimp_text_layout_render_trafo (GimpTextLayout *layout,
FT_Matrix *trafo)
{
GimpText *text = layout->text;
trafo->xx = text->transformation.coeff[0][0] * 65536.0;
trafo->xy = text->transformation.coeff[0][1] * 65536.0;
trafo->yx = text->transformation.coeff[1][0] * 65536.0;
trafo->yy = text->transformation.coeff[1][1] * 65536.0;
}
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