| /* |
| * 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 MIN(a,b) ((a) < (b) ? (a) : (b)) |
| |
| #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) |