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author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-01-18 18:06:51 +0000 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-01-22 23:01:50 +0000 |
commit | dc8290814c0e98b38828953bac6dd0893c31c9ad (patch) | |
tree | d4977b496e464a541f277fabad4ac23138752f63 /test/subsurface.c | |
parent | b8eacbfae1c155f412d84120411103cb610e383b (diff) | |
download | cairo-dc8290814c0e98b38828953bac6dd0893c31c9ad.tar.gz |
Add subsurface.
A subsurface is a region of another surface that may be used either to
restrict the writable area of a context or the readable extents of a
source. Whilst writing, access to the exterior of the subsurface is
prevented via clipping and when used as a source reads from the exterior
of the subsurface are governed via the extend mechanism of the pattern.
Diffstat (limited to 'test/subsurface.c')
-rw-r--r-- | test/subsurface.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/test/subsurface.c b/test/subsurface.c new file mode 100644 index 000000000..f32588859 --- /dev/null +++ b/test/subsurface.c @@ -0,0 +1,80 @@ +/* + * Copyright 2009 Intel Corporation + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of + * Intel not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Intel makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * INTEL CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL INTEL CORPORATION BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Author: Chris Wilson <chris@chris-wilson.co.uk> + */ + +#include "cairo-test.h" + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_surface_t *region[5]; + const char *text = "Cairo"; + int i; + + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + cairo_set_source_rgb (cr, 0, 0, 0); + + for (i = 0; i < 5; i++) { + cairo_t *cr_region; + cairo_text_extents_t extents; + char buf[2] = { text[i], '\0' }; + + region[i] = cairo_surface_create_for_region (cairo_get_target (cr), + 20 * i, 0, 20, 20); + + cr_region = cairo_create (region[i]); + cairo_surface_destroy (region[i]); + + cairo_select_font_face (cr_region, "@cairo:", + CAIRO_FONT_WEIGHT_NORMAL, + CAIRO_FONT_SLANT_NORMAL); + cairo_set_font_size (cr_region, 20); + cairo_text_extents (cr_region, buf, &extents); + cairo_move_to (cr_region, + 10 - (extents.width/2 + extents.x_bearing), + 10 - (extents.height/2 + extents.y_bearing)); + cairo_show_text (cr_region, buf); + + region[i] = cairo_surface_reference (cairo_get_target (cr_region)); + cairo_destroy (cr_region); + } + + for (i = 0; i < 5; i++) { + cairo_set_source_surface (cr, region[5-i-1], 20 * i, 20); + cairo_paint_with_alpha (cr, .5); + } + + for (i = 0; i < 5; i++) + cairo_surface_destroy (region[i]); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (subsurface, + "Tests clipping of both source and destination using subsurfaces", + "subsurface", /* keywords */ + NULL, /* requirements */ + 100, 40, + NULL, draw) |