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/*
* Copyright (c) 2010 M Joonas Pihlaja
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
*/
#include "cairo-test.h"
/* Tests specific clipping fast paths and their interaction with
* groups: It shouldn't matter if the clip is set before or after
* pushing a group.
*
* There's some overlap with the following tests, but they test for
* different things:
*
* group-clip.c (tests preserving paths), clipped-group.c (tests
* clipping the same thing different ways), clip-push-group (tests
* for a specific bug).
*/
#define GENERATE_REF 0
/* For determining whether we establish the clip path before or after
* pushing a group. */
enum {
CLIP_OUTSIDE_GROUP,
CLIP_INSIDE_GROUP
};
typedef void (*clipper_t)(cairo_t *cr, int w, int h);
static cairo_test_status_t
clip_and_paint (cairo_t *cr,
int w, int h,
clipper_t do_clip,
int clip_where)
{
cairo_save (cr); {
if (GENERATE_REF) {
do_clip (cr, w, h);
cairo_paint (cr);
} else {
if (clip_where == CLIP_OUTSIDE_GROUP)
do_clip (cr, w, h);
cairo_push_group (cr); {
if (clip_where == CLIP_INSIDE_GROUP)
do_clip (cr, w, h);
cairo_paint (cr);
}
cairo_pop_group_to_source (cr);
if (clip_where == CLIP_OUTSIDE_GROUP)
cairo_reset_clip (cr);
cairo_paint (cr);
}
}
cairo_restore (cr);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
run_clip_test (cairo_t *cr, int w, int h, clipper_t do_clip)
{
cairo_set_source_rgb (cr, 1,1,1);
cairo_paint (cr);
cairo_set_source_rgb (cr, 1,0,0);
/* Left. */
clip_and_paint (cr, w/2, h, do_clip, CLIP_OUTSIDE_GROUP);
/* Right */
cairo_translate(cr, w/2, 0);
clip_and_paint (cr, w/2, h, do_clip, CLIP_INSIDE_GROUP);
return CAIRO_TEST_SUCCESS;
}
static void
clip_aligned_rectangles (cairo_t *cr, int w, int h)
{
int x1 = 0.2 * w;
int y1 = 0.2 * h;
int x2 = 0.8 * w;
int y2 = 0.8 * h;
cairo_rectangle (cr, x1, y1, w, h);
cairo_clip (cr);
cairo_rectangle (cr, x2, y2, -w, -h);
cairo_clip (cr);
}
static void
clip_unaligned_rectangles (cairo_t *cr, int w, int h)
{
/* This clip stresses the antialiased edges produced by an
* unaligned rectangular clip. The edges should be produced by
* compositing red on white with alpha = 0.5 on the sides, and with
* alpha = 0.25 in the corners. */
int x1 = 0.2 * w;
int y1 = 0.2 * h;
int x2 = 0.8 * w;
int y2 = 0.8 * h;
cairo_rectangle (cr, x1+0.5, y1+0.5, w, h);
cairo_clip (cr);
cairo_rectangle (cr, x2+0.5, y2+0.5, -w, -h);
w = x2 - x1;
h = y2 - y1;
cairo_rectangle (cr, x2, y1+1, -w+1, h-1);
cairo_clip (cr);
}
static void
clip_circles (cairo_t *cr, int w, int h)
{
int x1 = 0.5 * w;
int y1 = 0.5 * h;
int x2 = 0.75 * w;
int y2 = 0.75 * h;
int r = 0.4*MIN(w,h);
cairo_arc (cr, x1, y1, r, 0, 6.28);
cairo_close_path (cr);
cairo_clip (cr);
cairo_arc (cr, x2, y2, r, 0, 6.28);
cairo_close_path (cr);
cairo_clip (cr);
}
static cairo_test_status_t
draw_aligned_rectangles (cairo_t *cr, int width, int height)
{
return run_clip_test (cr, width, height, clip_aligned_rectangles);
}
static cairo_test_status_t
draw_unaligned_rectangles (cairo_t *cr, int width, int height)
{
return run_clip_test (cr, width, height, clip_unaligned_rectangles);
}
static cairo_test_status_t
draw_circles (cairo_t *cr, int width, int height)
{
return run_clip_test (cr, width, height, clip_circles);
}
CAIRO_TEST (clip_group_shapes_aligned_rectangles,
"Test clip and group interaction with aligned rectangle clips",
"clip", /* keywords */
NULL, /* requirements */
200, 100,
NULL, draw_aligned_rectangles)
CAIRO_TEST (clip_group_shapes_unaligned_rectangles,
"Test clip and group interaction with unaligned rectangle clips",
"clip", /* keywords */
"target=raster", /* requirements */
200, 100,
NULL, draw_unaligned_rectangles)
CAIRO_TEST (clip_group_shapes_circles,
"Test clip and group interaction with circular clips",
"clip", /* keywords */
NULL, /* requirements */
200, 100,
NULL, draw_circles)