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78ff95ea4d
Fully hinted doesn't really mesh well with subpixel positioning as it doesn't handle the glyph being moved around in non-integer steps. So do what others do and disable subpixel positioning for anything but the slightest hinting.
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Copyright © 2019 Matthias Clasen
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Adrian Johnson <ajohnson@redneon.com>
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*/
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#include "cairo-test.h"
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#define WIDTH 300
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#define HEIGHT 300 * 4
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static void
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do_subtest(cairo_t *cr, double y, cairo_hint_style_t hint_style)
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{
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cairo_font_options_t *font_options;
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double size;
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cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY "DejaVu Sans Mono",
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CAIRO_FONT_SLANT_NORMAL,
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CAIRO_FONT_WEIGHT_NORMAL);
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font_options = cairo_font_options_create();
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cairo_get_font_options (cr, font_options);
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cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
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cairo_font_options_set_hint_style (font_options, hint_style);
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cairo_set_font_options (cr, font_options);
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cairo_font_options_destroy (font_options);
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cairo_set_source_rgb (cr, 0, 0, 0);
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for (size = 10.0; size <= 40.0; size += 3.3) {
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cairo_set_font_size (cr, size);
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y += size + 2.3;
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cairo_move_to (cr, 5, y);
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cairo_show_text (cr, "aaaaaaaaaa");
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}
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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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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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do_subtest(cr, 0.0, CAIRO_HINT_STYLE_NONE);
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do_subtest(cr, 300.0, CAIRO_HINT_STYLE_SLIGHT);
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do_subtest(cr, 600.0, CAIRO_HINT_STYLE_MEDIUM);
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do_subtest(cr, 900.0, CAIRO_HINT_STYLE_FULL);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (text_subpixel_positioning,
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"Test subpixel positioning",
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"text, font", /* keywords */
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NULL, /* requirements */
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WIDTH, HEIGHT,
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NULL, draw)
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