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https://gitlab.freedesktop.org/cairo/cairo.git
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Move analysis of operators from cairo-ps-surface.c to cairo-operator.c
This commit is contained in:
Carl Worth
parent
c7fd35fac2
commit
a7f4f1b350
4 changed files with 132 additions and 68 deletions
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@ -153,6 +153,7 @@ libcairo_la_SOURCES = \
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cairo-image-surface.c \
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cairo-lzw.c \
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cairo-matrix.c \
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cairo-operator.c \
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cairo-path.c \
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cairo-path-bounds.c \
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cairo-path-data.c \
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119
src/cairo-operator.c
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119
src/cairo-operator.c
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@ -0,0 +1,119 @@
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2006 Keith Packard
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* Copyright © 2006 Red Hat, Inc
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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 either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with 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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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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* Keith Packard <keithp@keithp.com>
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*/
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#include "cairoint.h"
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/* The analysis here assumes destination alpha semantics (that is
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* CAIRO_CONTENT_COLOR_ALPHA). More things can be considered opaque
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* otherwise (CAIRO_CONTENT_COLOR) so we'll probably want to add a
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* cairo_content_t parameter to this function
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*
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* We also need a definition of what "opaque" means. Is it, "does not
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* requiring 'knowing' the original contents of destination, nor does
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* it set the destination alpha to anything but 1.0" ?
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*/
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cairo_bool_t
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_cairo_operator_always_opaque (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return FALSE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return TRUE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return FALSE;
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}
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return FALSE;
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}
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/* As above, we'll probably want to add a cairo_content_t parameter to
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* this function
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*
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* We also need a definition of what "translucent" means.
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*/
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cairo_bool_t
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_cairo_operator_always_translucent (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return TRUE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return FALSE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return TRUE;
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}
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return TRUE;
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}
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@ -968,77 +968,12 @@ pattern_is_opaque (const cairo_pattern_t *abstract_pattern)
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return FALSE;
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}
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static cairo_bool_t
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operator_always_opaque (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return FALSE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return TRUE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return FALSE;
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}
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return FALSE;
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}
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static cairo_bool_t
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operator_always_translucent (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return TRUE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return FALSE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return TRUE;
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}
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return TRUE;
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}
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static cairo_bool_t
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surface_pattern_supported (const cairo_surface_pattern_t *pattern)
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{
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if (pattern->surface->backend->acquire_source_image != NULL)
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return TRUE;
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return FALSE;
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}
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@ -1047,6 +982,7 @@ pattern_supported (const cairo_pattern_t *pattern)
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{
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if (pattern->type == CAIRO_PATTERN_TYPE_SOLID)
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return TRUE;
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if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE)
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return surface_pattern_supported ((const cairo_surface_pattern_t *) pattern);
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@ -1061,9 +997,10 @@ operation_supported (cairo_ps_surface_t *surface,
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if (! pattern_supported (pattern))
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return FALSE;
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if (operator_always_opaque (op))
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if (_cairo_operator_always_opaque (op))
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return TRUE;
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if (operator_always_translucent (op))
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if (_cairo_operator_always_translucent (op))
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return FALSE;
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return pattern_is_opaque (pattern);
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@ -1390,6 +1390,13 @@ _cairo_font_options_init_copy (cairo_font_options_t *options,
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cairo_private cairo_status_t
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_cairo_hull_compute (cairo_pen_vertex_t *vertices, int *num_vertices);
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/* cairo_operator.c */
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cairo_private cairo_bool_t
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_cairo_operator_always_opaque (cairo_operator_t op);
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cairo_private cairo_bool_t
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_cairo_operator_always_translucent (cairo_operator_t op);
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/* cairo_path.c */
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cairo_private void
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_cairo_path_fixed_init (cairo_path_fixed_t *path);
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