From 56d06b088b9c355ca76a38191717a8e03aa5f59a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 14 Jun 2010 22:58:38 +0100 Subject: test: Add an aliasing test case. Just a simple test in drawing neighbouring edges and looking for the effects of aliasing. --- test/Makefile.am | 3 ++ test/Makefile.sources | 1 + test/aliasing.c | 98 ++++++++++++++++++++++++++++++++++++++++++ test/aliasing.image16.ref.png | Bin 0 -> 20810 bytes test/aliasing.ref.png | Bin 0 -> 22980 bytes test/aliasing.xlib.ref.png | Bin 0 -> 24018 bytes 6 files changed, 102 insertions(+) create mode 100644 test/aliasing.c create mode 100644 test/aliasing.image16.ref.png create mode 100644 test/aliasing.ref.png create mode 100644 test/aliasing.xlib.ref.png (limited to 'test') diff --git a/test/Makefile.am b/test/Makefile.am index b73e666e..6e314730 100644 --- a/test/Makefile.am +++ b/test/Makefile.am @@ -140,6 +140,9 @@ REFERENCE_IMAGES = \ a1-traps-sample.ref.png \ a1-traps-sample.quartz.xfail.png \ a8-mask.ref.png \ + aliasing.ref.png \ + aliasing.image16.ref.png \ + aliasing.xlib.ref.png \ alpha-similar.gl.argb32.xfail.png \ alpha-similar.gl.rgb24.xfail.png \ alpha-similar.pdf.argb32.xfail.png \ diff --git a/test/Makefile.sources b/test/Makefile.sources index b9516685..6dd2e3eb 100644 --- a/test/Makefile.sources +++ b/test/Makefile.sources @@ -4,6 +4,7 @@ test_sources = \ a1-mask-sample.c \ a1-traps-sample.c \ a8-mask.c \ + aliasing.c \ alpha-similar.c \ big-line.c \ big-trap.c \ diff --git a/test/aliasing.c b/test/aliasing.c new file mode 100644 index 00000000..2b8d666d --- /dev/null +++ b/test/aliasing.c @@ -0,0 +1,98 @@ +/* + * Copyright 2010 Intel Corporation + * + * 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: Chris Wilson + */ + +#include "cairo-test.h" + +/* A fun little test to explore color fringing in various experimental + * subpixel rasterisation techniques. + */ + +#define WIDTH 60 +#define HEIGHT 40 + +static const struct color { + double red, green, blue; +} color[] = { + { 1, 1, 1 }, + { 0, 0, 0 }, + { 1, 0, 0 }, + { 0, 1, 0 }, + { 0, 0, 1 } +}; +#define NUM_COLORS (sizeof (color) / sizeof (color[0])) +#ifndef MAX +#define MAX(a, b) ((a) > (b) ? (a) : (b)) +#endif + +static void +object (cairo_t *cr, const struct color *fg, const struct color *bg) +{ + cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue); + cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT); + cairo_fill (cr); + + cairo_set_source_rgb (cr, fg->red, fg->green, fg->blue); + cairo_save (cr); + cairo_scale (cr, WIDTH, HEIGHT); + cairo_arc (cr, .5, .5, .5 - 4. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI); + cairo_fill (cr); + cairo_arc (cr, .5, .5, .5 - 2. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI); + cairo_restore (cr); + cairo_set_line_width (cr, 1.); + cairo_stroke (cr); + + cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue); + cairo_set_line_width (cr, 4.); + cairo_move_to (cr, 4, HEIGHT-4); + cairo_line_to (cr, WIDTH-12, 4); + cairo_move_to (cr, 12, HEIGHT-4); + cairo_line_to (cr, WIDTH-4, 4); + cairo_stroke (cr); +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + unsigned int i, j; + + for (i = 0; i < NUM_COLORS; i++) { + for (j = 0; j < NUM_COLORS; j++) { + cairo_save (cr); + cairo_translate (cr, i * WIDTH, j * HEIGHT); + object (cr, &color[i], &color[j]); + cairo_restore (cr); + } + } + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (aliasing, + "Check for subpixel aliasing and color fringing", + "rasterisation", /* keywords */ + "target=raster", /* requirements */ + NUM_COLORS * WIDTH, NUM_COLORS * HEIGHT, + NULL, draw) diff --git a/test/aliasing.image16.ref.png b/test/aliasing.image16.ref.png new file mode 100644 index 00000000..8fabbc5f Binary files /dev/null and b/test/aliasing.image16.ref.png differ diff --git a/test/aliasing.ref.png b/test/aliasing.ref.png new file mode 100644 index 00000000..6a007762 Binary files /dev/null and b/test/aliasing.ref.png differ diff --git a/test/aliasing.xlib.ref.png b/test/aliasing.xlib.ref.png new file mode 100644 index 00000000..3fd8c071 Binary files /dev/null and b/test/aliasing.xlib.ref.png differ -- cgit v1.2.3