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91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2012 Intel Corporation
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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 2 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 <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:clutter-cairo
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* @Title: Cairo integration
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* @Short_Description: Functions for interoperating with Cairo
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*
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* Clutter provides some utility functions for using Cairo.
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*/
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#include "clutter-build-config.h"
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#include "clutter-cairo.h"
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#include "clutter-color.h"
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/**
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* clutter_cairo_set_source_color:
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* @cr: a Cairo context
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* @color: a #ClutterColor
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*
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* Utility function for setting the source color of @cr using
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* a #ClutterColor. This function is the equivalent of:
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*
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* |[
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* cairo_set_source_rgba (cr,
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* color->red / 255.0,
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* color->green / 255.0,
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* color->blue / 255.0,
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* color->alpha / 255.0);
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* ]|
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*
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* Since: 1.0
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*/
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void
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clutter_cairo_set_source_color (cairo_t *cr,
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const ClutterColor *color)
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{
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g_return_if_fail (cr != NULL);
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g_return_if_fail (color != NULL);
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if (color->alpha == 0xff)
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cairo_set_source_rgb (cr,
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color->red / 255.0,
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color->green / 255.0,
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color->blue / 255.0);
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else
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cairo_set_source_rgba (cr,
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color->red / 255.0,
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color->green / 255.0,
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color->blue / 255.0,
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color->alpha / 255.0);
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}
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/**
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* clutter_cairo_clear:
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* @cr: a Cairo context
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*
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* Utility function to clear a Cairo context.
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*
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* Since: 1.12
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*/
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void
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clutter_cairo_clear (cairo_t *cr)
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{
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cairo_save (cr);
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cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
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cairo_paint (cr);
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cairo_restore (cr);
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}
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