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75fea162d9
The ARRAY_LENGTH macro is used by many tests, although sometimes it is named ARRAY_SIZE. Define it just once in cairo-test.h and reuse it. In a similar way, MAX() and MIN() are currently defined in some specific tests, while they could be reused.
100 lines
3 KiB
C
100 lines
3 KiB
C
/*
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* Copyright 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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/* A fun little test to explore color fringing in various experimental
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* subpixel rasterisation techniques.
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*/
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#define WIDTH 60
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#define HEIGHT 40
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static const struct color {
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double red, green, blue;
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} color[] = {
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{ 1, 1, 1 },
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{ 0, 0, 0 },
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{ 1, 0, 0 },
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{ 0, 1, 0 },
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{ 0, 0, 1 },
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{ 1, 1, 0 },
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{ 0, 1, 1 },
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{ 1, 0, 1 },
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{ .5, .5, .5 },
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};
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#define NUM_COLORS ARRAY_LENGTH (color)
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static void
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object (cairo_t *cr, const struct color *fg, const struct color *bg)
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{
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cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue);
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cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
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cairo_fill (cr);
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cairo_set_source_rgb (cr, fg->red, fg->green, fg->blue);
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cairo_save (cr);
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cairo_scale (cr, WIDTH, HEIGHT);
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cairo_arc (cr, .5, .5, .5 - 4. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI);
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cairo_fill (cr);
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cairo_arc (cr, .5, .5, .5 - 2. / MAX (WIDTH, HEIGHT), 0, 2 * M_PI);
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cairo_restore (cr);
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cairo_set_line_width (cr, 1.);
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cairo_stroke (cr);
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cairo_set_source_rgb (cr, bg->red, bg->green, bg->blue);
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cairo_set_line_width (cr, 4.);
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cairo_move_to (cr, 4, HEIGHT-4);
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cairo_line_to (cr, WIDTH-12, 4);
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cairo_move_to (cr, 12, HEIGHT-4);
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cairo_line_to (cr, WIDTH-4, 4);
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cairo_stroke (cr);
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}
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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unsigned int i, j;
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for (i = 0; i < NUM_COLORS; i++) {
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for (j = 0; j < NUM_COLORS; j++) {
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cairo_save (cr);
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cairo_translate (cr, i * WIDTH, j * HEIGHT);
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object (cr, &color[i], &color[j]);
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cairo_restore (cr);
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}
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}
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (aliasing,
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"Check for subpixel aliasing and color fringing",
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"rasterisation", /* keywords */
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"target=raster", /* requirements */
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NUM_COLORS * WIDTH, NUM_COLORS * HEIGHT,
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NULL, draw)
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