mirror of https://github.com/GNOME/gimp.git
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* GimpText
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* Copyright (C) 2003 Sven Neumann <sven@gimp.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#define PANGO_ENABLE_ENGINE
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#include <pango/pangoft2.h>
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#include "text/text-types.h"
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#include "gimptext-bitmap.h"
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/* for compatibility with older freetype versions */
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#ifndef FT_LOAD_TARGET_MONO
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#define FT_LOAD_TARGET_MONO FT_LOAD_MONOCHROME
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#endif
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void
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gimp_text_render_bitmap (PangoFont *font,
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PangoGlyph glyph,
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FT_Int32 flags,
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FT_Matrix *trafo,
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gint x,
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gint y,
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FT_Bitmap *bitmap)
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{
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FT_Face face;
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gint y_start, y_limit, x_start, x_limit;
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gint ix, iy;
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const guchar *src;
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guchar *dest;
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face = pango_fc_font_lock_face (PANGO_FC_FONT (font));
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FT_Set_Transform (face, trafo, NULL);
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FT_Load_Glyph (face, (FT_UInt) glyph, flags);
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FT_Render_Glyph (face->glyph,
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(flags & FT_LOAD_TARGET_MONO ?
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ft_render_mode_mono : ft_render_mode_normal));
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x = PANGO_PIXELS (x);
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y = PANGO_PIXELS (y);
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x_start = MAX (0, - (x + face->glyph->bitmap_left));
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x_limit = MIN (face->glyph->bitmap.width,
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bitmap->width - (x + face->glyph->bitmap_left));
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y_start = MAX (0, - (y - face->glyph->bitmap_top));
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y_limit = MIN (face->glyph->bitmap.rows,
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bitmap->rows - (y - face->glyph->bitmap_top));
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src = face->glyph->bitmap.buffer + y_start * face->glyph->bitmap.pitch;
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dest = bitmap->buffer +
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(y_start + y - face->glyph->bitmap_top) * bitmap->pitch +
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x_start + x + face->glyph->bitmap_left;
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switch (face->glyph->bitmap.pixel_mode)
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{
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case ft_pixel_mode_grays:
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src += x_start;
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for (iy = y_start; iy < y_limit; iy++)
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{
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const guchar *s = src;
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guchar *d = dest;
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for (ix = x_start; ix < x_limit; ix++)
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{
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switch (*s)
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{
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case 0:
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break;
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case 0xff:
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*d = 0xff;
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default:
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*d = MIN ((gushort) *d + (const gushort) *s, 0xff);
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break;
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}
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s++;
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d++;
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}
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dest += bitmap->pitch;
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src += face->glyph->bitmap.pitch;
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}
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break;
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case ft_pixel_mode_mono:
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src += x_start / 8;
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for (iy = y_start; iy < y_limit; iy++)
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{
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const guchar *s = src;
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guchar *d = dest;
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for (ix = x_start; ix < x_limit; ix++)
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{
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if ((*s) & (1 << (7 - (ix % 8))))
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*d |= 0xff;
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if ((ix % 8) == 7)
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s++;
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d++;
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}
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dest += bitmap->pitch;
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src += face->glyph->bitmap.pitch;
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}
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break;
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default:
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break;
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}
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pango_fc_font_unlock_face (PANGO_FC_FONT (font));
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}
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