mirror of https://github.com/GNOME/gimp.git
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpcairocolor.c
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* Copyright (C) 2007 Sven Neumann <sven@gimp.org>
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* 2010 Michael Natterer <mitch@gimp.org>
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include <cairo.h>
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#include "libgimpbase/gimpbase.h"
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#include "gimpcolortypes.h"
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#include "gimpcairocolor.h"
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/**
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* SECTION: gimpcairocolor
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* @title: GimpCairoColor
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* @short_description: Color utility functions for cairo
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*
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* Utility functions that make cairo easier to use with GIMP color
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* data types.
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**/
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/**
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* gimp_cairo_set_source_rgb:
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* @cr: Cairo context
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* @color: GimpRGB color
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*
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* Sets the source pattern within @cr to the solid opaque color
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* described by @color.
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*
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* This function calls cairo_set_source_rgb() for you.
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*
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* Since: GIMP 2.6
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**/
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void
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gimp_cairo_set_source_rgb (cairo_t *cr,
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const GimpRGB *color)
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{
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cairo_set_source_rgb (cr, color->r, color->g, color->b);
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}
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/**
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* gimp_cairo_set_source_rgba:
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* @cr: Cairo context
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* @color: GimpRGB color
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*
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* Sets the source pattern within @cr to the solid translucent color
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* described by @color.
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*
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* This function calls cairo_set_source_rgba() for you.
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*
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* Since: GIMP 2.6
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**/
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void
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gimp_cairo_set_source_rgba (cairo_t *cr,
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const GimpRGB *color)
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{
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cairo_set_source_rgba (cr, color->r, color->g, color->b, color->a);
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}
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/**
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* gimp_cairo_checkerboard_create:
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* @cr: Cairo context
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* @size: check size
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* @light: light check color or %NULL to use the default light gray
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* @dark: dark check color or %NULL to use the default dark gray
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*
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* Create a repeating checkerboard pattern.
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*
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* Return value: a new Cairo pattern that can be used as a source on @cr.
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*
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* Since: GIMP 2.6
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**/
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cairo_pattern_t *
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gimp_cairo_checkerboard_create (cairo_t *cr,
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gint size,
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const GimpRGB *light,
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const GimpRGB *dark)
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{
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cairo_t *context;
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cairo_surface_t *surface;
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cairo_pattern_t *pattern;
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g_return_val_if_fail (cr != NULL, NULL);
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g_return_val_if_fail (size > 0, NULL);
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surface = cairo_surface_create_similar (cairo_get_target (cr),
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CAIRO_CONTENT_COLOR,
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2 * size, 2 * size);
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context = cairo_create (surface);
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if (light)
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gimp_cairo_set_source_rgb (context, light);
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else
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cairo_set_source_rgb (context,
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GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT);
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cairo_rectangle (context, 0, 0, size, size);
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cairo_rectangle (context, size, size, size, size);
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cairo_fill (context);
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if (dark)
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gimp_cairo_set_source_rgb (context, dark);
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else
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cairo_set_source_rgb (context,
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GIMP_CHECK_DARK, GIMP_CHECK_DARK, GIMP_CHECK_DARK);
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cairo_rectangle (context, 0, size, size, size);
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cairo_rectangle (context, size, 0, size, size);
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cairo_fill (context);
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cairo_destroy (context);
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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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