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Diffstat (limited to 'libs/cairo-1.16.0/test/clip-group-shapes.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/clip-group-shapes.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/clip-group-shapes.c b/libs/cairo-1.16.0/test/clip-group-shapes.c new file mode 100644 index 0000000..88bb9b3 --- /dev/null +++ b/libs/cairo-1.16.0/test/clip-group-shapes.c @@ -0,0 +1,188 @@ +/* + * 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) |