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Diffstat (limited to 'src/cairo-composite-rectangles.c')
| -rw-r--r-- | src/cairo-composite-rectangles.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/cairo-composite-rectangles.c b/src/cairo-composite-rectangles.c new file mode 100644 index 00000000..2bd823f1 --- /dev/null +++ b/src/cairo-composite-rectangles.c @@ -0,0 +1,197 @@ +/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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); +} |