diff options
author | Andrea Canciani <ranma42@gmail.com> | 2010-11-26 17:55:35 +0100 |
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committer | Andrea Canciani <ranma42@gmail.com> | 2010-12-02 10:28:08 +0100 |
commit | 7b29f1d5d85ebb7e92e9759692233c80a4687a07 (patch) | |
tree | 8f8874732f54499778dfe0413edd202c21c10f1d | |
parent | 9ec51baa779a30041ea944643d4d0b8333bb759b (diff) |
test: Add rectilinear-grid
The rectilinear scan converter assumes disjoint rects as input, but
cairo-image passes intersecting rectangles to it.
This test shows that image and any backends passing through it for the
rasterization (fallbacks, vector backends whose renderer is
cairo-based) fail in compute the corners of intersecting rectangles
correctly.
-rw-r--r-- | test/Makefile.am | 2 | ||||
-rw-r--r-- | test/Makefile.sources | 1 | ||||
-rw-r--r-- | test/rectilinear-grid.c | 78 | ||||
-rw-r--r-- | test/rectilinear-grid.image16.ref.png | bin | 0 -> 638 bytes | |||
-rw-r--r-- | test/rectilinear-grid.ref.png | bin | 0 -> 569 bytes |
5 files changed, 81 insertions, 0 deletions
diff --git a/test/Makefile.am b/test/Makefile.am index a3c1f7a40..ad2b9593e 100644 --- a/test/Makefile.am +++ b/test/Makefile.am @@ -1066,6 +1066,8 @@ REFERENCE_IMAGES = \ rectilinear-dash.quartz.xfail.png \ rectilinear-dash.ref.png \ rectilinear-fill.ref.png \ + rectilinear-grid.image16.ref.png \ + rectilinear-grid.ref.png \ rectilinear-miter-limit.ps2.ref.png \ rectilinear-miter-limit.ps3.ref.png \ rectilinear-miter-limit.ref.png \ diff --git a/test/Makefile.sources b/test/Makefile.sources index a13aea82c..b6431d17f 100644 --- a/test/Makefile.sources +++ b/test/Makefile.sources @@ -207,6 +207,7 @@ test_sources = \ random-intersections-curves-nz.c \ rectangle-rounding-error.c \ rectilinear-fill.c \ + rectilinear-grid.c \ rectilinear-miter-limit.c \ rectilinear-dash.c \ rectilinear-stroke.c \ diff --git a/test/rectilinear-grid.c b/test/rectilinear-grid.c new file mode 100644 index 000000000..1baadf732 --- /dev/null +++ b/test/rectilinear-grid.c @@ -0,0 +1,78 @@ +/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ +/* + * Copyright 2010 Andrea Canciani + * + * 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: Andrea Canciani <ranma42@gmail.com> + */ + +#include "cairo-test.h" + +#define SIZE 52 +#define OFFSET 5 +#define DISTANCE 10.25 + +/* + This test checks that boxes not aligned to pixels are drawn + correctly. + + In particular the corners of the boxes are drawn incorrectly by + cairo-image in cairo 1.10.0, because overlapping boxes are passed to + a span converter which assumes disjoint boxes as input. + + This results in corners to be drawn with the wrong shade. +*/ + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + int i; + + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + + cairo_set_operator (cr, CAIRO_OPERATOR_OVER); + cairo_set_source_rgb (cr, 0, 0, 0); + cairo_set_line_width (cr, 4); + cairo_translate (cr, 2*OFFSET, 2*OFFSET); + + for (i = 0; i < 4; i++) { + double x = i * DISTANCE; + + cairo_move_to (cr, x, -OFFSET-0.75); + cairo_line_to (cr, x, SIZE-3*OFFSET-0.25); + + cairo_move_to (cr, -OFFSET-0.75, x); + cairo_line_to (cr, SIZE-3*OFFSET-0.25, x); + } + + cairo_stroke (cr); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (rectilinear_grid, + "Test rectilinear rasterizer (covering partial pixels)", + "rectilinear", /* keywords */ + NULL, /* requirements */ + SIZE, SIZE, + NULL, draw) diff --git a/test/rectilinear-grid.image16.ref.png b/test/rectilinear-grid.image16.ref.png Binary files differnew file mode 100644 index 000000000..4d4c4da73 --- /dev/null +++ b/test/rectilinear-grid.image16.ref.png diff --git a/test/rectilinear-grid.ref.png b/test/rectilinear-grid.ref.png Binary files differnew file mode 100644 index 000000000..8d47ef567 --- /dev/null +++ b/test/rectilinear-grid.ref.png |