mirror of https://github.com/GNOME/gimp.git
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpcairo.c
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* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
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*
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* Some code here is based on code from librsvg that was originally
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* written by Raph Levien <raph@artofcode.com> for Gill.
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "widgets-types.h"
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#include "gimpcairo.h"
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static cairo_user_data_key_t surface_data_key = { 0, };
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cairo_pattern_t *
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gimp_cairo_stipple_pattern_create (const GimpRGB *fg,
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const GimpRGB *bg,
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gint index)
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{
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cairo_surface_t *surface;
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cairo_pattern_t *pattern;
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guchar *data = g_malloc0 (8 * 8 * 4);
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guchar fg_r, fg_g, fg_b, fg_a;
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guchar bg_r, bg_g, bg_b, bg_a;
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gint x, y;
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guchar *d;
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g_return_val_if_fail (fg != NULL, NULL);
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g_return_val_if_fail (bg != NULL, NULL);
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data = g_malloc (8 * 8 * 4);
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gimp_rgba_get_uchar (fg, &fg_r, &fg_g, &fg_b, &fg_a);
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gimp_rgba_get_uchar (bg, &bg_r, &bg_g, &bg_b, &bg_a);
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d = data;
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for (y = 0; y < 8; y++)
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{
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for (x = 0; x < 8; x++)
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{
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if ((x + y + index) % 8 >= 4)
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GIMP_CAIRO_ARGB32_SET_PIXEL (d, fg_r, fg_g, fg_b, fg_a);
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else
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GIMP_CAIRO_ARGB32_SET_PIXEL (d, bg_r, bg_g, bg_b, bg_a);
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d += 4;
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}
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}
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surface = cairo_image_surface_create_for_data (data,
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CAIRO_FORMAT_ARGB32,
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8, 8, 8 * 4);
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cairo_surface_set_user_data (surface, &surface_data_key,
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data, (cairo_destroy_func_t) g_free);
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pattern = cairo_pattern_create_for_surface (surface);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
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cairo_surface_destroy (surface);
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return pattern;
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}
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