| /* cairo - a vector graphics library with display and print output |
| * |
| * Copyright © 2009 Intel Corporation |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it either under the terms of the GNU Lesser General Public |
| * License version 2.1 as published by the Free Software Foundation |
| * (the "LGPL") or, at your option, under the terms of the Mozilla |
| * Public License Version 1.1 (the "MPL"). If you do not alter this |
| * notice, a recipient may use your version of this file under either |
| * the MPL or the LGPL. |
| * |
| * You should have received a copy of the LGPL along with this library |
| * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
| * You should have received a copy of the MPL along with this library |
| * in the file COPYING-MPL-1.1 |
| * |
| * The contents of this file are subject to the Mozilla Public License |
| * Version 1.1 (the "License"); you may not use this file except in |
| * compliance with the License. You may obtain a copy of the License at |
| * http://www.mozilla.org/MPL/ |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
| * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
| * the specific language governing rights and limitations. |
| * |
| * The Original Code is the cairo graphics library. |
| * |
| * The Initial Developer of the Original Code is Red Hat, Inc. |
| * |
| * Contributor(s): |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| */ |
| |
| #include "cairoint.h" |
| |
| #include "cairo-error-private.h" |
| #include "cairo-composite-rectangles-private.h" |
| |
| /* A collection of routines to facilitate writing compositors. */ |
| |
| static inline cairo_bool_t |
| _cairo_composite_rectangles_init (cairo_composite_rectangles_t *extents, |
| int width, int height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| cairo_clip_t *clip) |
| { |
| extents->unbounded.x = extents->unbounded.y = 0; |
| extents->unbounded.width = width; |
| extents->unbounded.height = height; |
| |
| if (clip != NULL) { |
| const cairo_rectangle_int_t *clip_extents; |
| |
| clip_extents = _cairo_clip_get_extents (clip); |
| if (clip_extents == NULL) |
| return FALSE; |
| |
| if (! _cairo_rectangle_intersect (&extents->unbounded, clip_extents)) |
| return FALSE; |
| } |
| |
| extents->bounded = extents->unbounded; |
| extents->is_bounded = _cairo_operator_bounded_by_either (op); |
| |
| _cairo_pattern_get_extents (source, &extents->source); |
| if (extents->is_bounded & CAIRO_OPERATOR_BOUND_BY_SOURCE) { |
| if (! _cairo_rectangle_intersect (&extents->bounded, &extents->source)) |
| return FALSE; |
| } |
| |
| return TRUE; |
| } |
| |
| cairo_int_status_t |
| _cairo_composite_rectangles_init_for_paint (cairo_composite_rectangles_t *extents, |
| int surface_width, int surface_height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| cairo_clip_t *clip) |
| { |
| if (! _cairo_composite_rectangles_init (extents, |
| surface_width, surface_height, |
| op, source, clip)) |
| { |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| } |
| |
| extents->mask = extents->bounded; |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| static cairo_int_status_t |
| _cairo_composite_rectangles_intersect (cairo_composite_rectangles_t *extents) |
| { |
| cairo_bool_t ret; |
| |
| ret = _cairo_rectangle_intersect (&extents->bounded, &extents->mask); |
| if (! ret && extents->is_bounded & CAIRO_OPERATOR_BOUND_BY_MASK) |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| cairo_int_status_t |
| _cairo_composite_rectangles_init_for_mask (cairo_composite_rectangles_t *extents, |
| int surface_width, int surface_height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| const cairo_pattern_t *mask, |
| cairo_clip_t *clip) |
| { |
| if (! _cairo_composite_rectangles_init (extents, |
| surface_width, surface_height, |
| op, source, clip)) |
| { |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| } |
| |
| _cairo_pattern_get_extents (mask, &extents->mask); |
| |
| return _cairo_composite_rectangles_intersect (extents); |
| } |
| |
| cairo_int_status_t |
| _cairo_composite_rectangles_init_for_stroke (cairo_composite_rectangles_t *extents, |
| int surface_width, int surface_height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| cairo_path_fixed_t *path, |
| const cairo_stroke_style_t *style, |
| const cairo_matrix_t *ctm, |
| cairo_clip_t *clip) |
| { |
| if (! _cairo_composite_rectangles_init (extents, |
| surface_width, surface_height, |
| op, source, clip)) |
| { |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| } |
| |
| _cairo_path_fixed_approximate_stroke_extents (path, style, ctm, &extents->mask); |
| |
| return _cairo_composite_rectangles_intersect (extents); |
| } |
| |
| cairo_int_status_t |
| _cairo_composite_rectangles_init_for_fill (cairo_composite_rectangles_t *extents, |
| int surface_width, int surface_height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| cairo_path_fixed_t *path, |
| cairo_clip_t *clip) |
| { |
| if (! _cairo_composite_rectangles_init (extents, |
| surface_width, surface_height, |
| op, source, clip)) |
| { |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| } |
| |
| _cairo_path_fixed_approximate_fill_extents (path, &extents->mask); |
| |
| return _cairo_composite_rectangles_intersect (extents); |
| } |
| |
| cairo_int_status_t |
| _cairo_composite_rectangles_init_for_glyphs (cairo_composite_rectangles_t *extents, |
| int surface_width, int surface_height, |
| cairo_operator_t op, |
| const cairo_pattern_t *source, |
| cairo_scaled_font_t *scaled_font, |
| cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_clip_t *clip, |
| cairo_bool_t *overlap) |
| { |
| cairo_status_t status; |
| |
| if (! _cairo_composite_rectangles_init (extents, |
| surface_width, surface_height, |
| op, source, clip)) |
| { |
| return CAIRO_INT_STATUS_NOTHING_TO_DO; |
| } |
| |
| status = _cairo_scaled_font_glyph_device_extents (scaled_font, |
| glyphs, num_glyphs, |
| &extents->mask, |
| overlap); |
| if (unlikely (status)) |
| return status; |
| |
| return _cairo_composite_rectangles_intersect (extents); |
| } |