зеркало из https://github.com/mozilla/gecko-dev.git
108 строки
4.0 KiB
C
108 строки
4.0 KiB
C
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Novell code.
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*
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* The Initial Developer of the Original Code is Novell.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* rocallahan@novell.com
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "cairo-gdk-utils.h"
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#include <stdlib.h>
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#if HAVE_STDINT_H
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#include <stdint.h>
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#elif HAVE_INTTYPES_H
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#include <inttypes.h>
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#elif HAVE_SYS_INT_TYPES_H
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#include <sys/int_types.h>
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#endif
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/* We have three basic strategies available:
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1) 'direct': cr targets a native surface, and other conditions are met: we can
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pass the underlying drawable directly to the callback
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2) 'opaque': the image is opaque: we can create a temporary cairo native surface,
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pass its underlying drawable to the callback, and paint the result
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using cairo
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3) 'default': create a temporary cairo native surface, fill with black, pass its
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underlying drawable to the callback, copy the results to a cairo
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image surface, repeat with a white background, update the on-black
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image alpha values by comparing the two images, then paint the on-black
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image using cairo
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Sure would be nice to have an X extension to do 3 for us on the server...
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*/
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static cairo_bool_t
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_convert_coord_to_short (double coord, short *v)
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{
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*v = (short)coord;
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/* XXX allow some tolerance here? */
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return *v == coord;
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}
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static cairo_bool_t
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_convert_coord_to_unsigned_short (double coord, unsigned short *v)
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{
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*v = (unsigned short)coord;
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/* XXX allow some tolerance here? */
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return *v == coord;
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}
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void cairo_draw_with_gdk (cairo_t *cr,
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cairo_gdk_drawing_callback callback,
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void * closure,
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unsigned int width, unsigned int height,
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cairo_gdk_drawing_opacity_t is_opaque,
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cairo_gdk_drawing_support_t capabilities,
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cairo_gdk_drawing_result_t *result)
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{
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double device_offset_x, device_offset_y;
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short offset_x = 0, offset_y = 0;
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//cairo_surface_t * target = cairo_get_group_target (cr);
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cairo_surface_t * target = cairo_get_target (cr);
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cairo_matrix_t matrix;
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cairo_surface_get_device_offset (target, &device_offset_x, &device_offset_y);
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cairo_get_matrix (cr, &matrix);
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_convert_coord_to_short (matrix.x0 + device_offset_x, &offset_x);
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_convert_coord_to_short (matrix.y0 + device_offset_y, &offset_y);
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cairo_surface_flush (target);
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callback (closure, target, offset_x, offset_y, NULL, 0);
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cairo_surface_mark_dirty (target);
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}
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