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Diffstat (limited to 'libs/cairo-1.16.0/test/text-rotate.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/text-rotate.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/text-rotate.c b/libs/cairo-1.16.0/test/text-rotate.c new file mode 100644 index 0000000..0a805ac --- /dev/null +++ b/libs/cairo-1.16.0/test/text-rotate.c @@ -0,0 +1,189 @@ +/* + * Copyright © 2004 Red Hat, Inc. + * + * 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 + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. 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: Carl D. Worth <cworth@cworth.org> + */ + +/* Bug history + * + * 2004-11-03 Steve Chaplin <stevech1097@yahoo.com.au> + * + * Reported bug on mailing list: + * + * From: Steve Chaplin <stevech1097@yahoo.com.au> + * To: cairo@cairographics.org + * Date: Thu, 04 Nov 2004 00:00:17 +0800 + * Subject: [cairo] Rotated text bug on drawable target + * + * The attached file draws text rotated 90 degrees first to a PNG file and + * then to a drawable. The PNG file looks fine, the text on the drawable is + * unreadable. + * + * Steve + * + * 2004-11-03 Carl Worth <cworth@cworth.org> + * + * Looks like the major problems with this bug appeared in the great + * font rework between 0.1.23 and 0.2.0. And it looks like we need + * to fix the regression test suite to test the xlib target (since + * the bug does not show up in the png backend). + * + * Hmm... Actually, things don't look perfect even in the PNG + * output. Look at how that 'o' moves around. It's particularly off + * in the case where it's rotated by PI. + * + * And I'm still not sure about what to do for test cases with + * text--a new version of freetype will change everything. We may + * need to add a simple backend for stroked fonts and add a simple + * builtin font to cairo for pixel-perfect tests with text. + * + * 2005-08-23 + * + * It appears that the worst placement and glyph selection problems + * have now been resolved. In the past some letters were noticeably + * of a different size at some rotations, and there was a lot of + * drift away from the baseline. These problems do not appear + * anymore. + * + * Another thing that helps is that we now have font options which + * we can use to disable hinting in order to get more repeatable + * results. I'm doing that in this test now. + * + * There are still some subtle positioning problems which I'm + * assuming are due to the lack of finer-than-whole-pixel glyph + * positioning. I'm generating a reference image now by replacing + * cairo_show_text with cairo_text_path; cairo_fill. This will let + * us look more closely at the remaining positioning problems. (In + * particular, I want to make sure we're rounding as well as + * possible). + * + * 2007-02-21 + * + * Seems like all the "bugs" have been fixed and all remaining is + * missing support for subpixel glyph positioning. Removing from + * XFAIL now. + */ + +#include "cairo-test.h" + +#define WIDTH 150 +#define HEIGHT 150 +#define NUM_TEXT 20 +#define TEXT_SIZE 12 + +/* Draw the word cairo at NUM_TEXT different angles. + * We separate the circle into quadrants to reduce + * numerical errors i.e. so each quarter is pixel-aligned. + */ +static void +draw_quadrant (cairo_t *cr, + const char *text, + const cairo_text_extents_t *extents, + const cairo_matrix_t *transform, + int x_off, int y_off) +{ + int i; + + for (i = 0; i < NUM_TEXT/4; i++) { + cairo_save (cr); + cairo_rotate (cr, 2*M_PI*i/NUM_TEXT); + cairo_transform (cr, transform); + cairo_set_line_width (cr, 1.0); + cairo_rectangle (cr, x_off - 0.5, y_off - 0.5, extents->width + 1, extents->height + 1); + cairo_set_source_rgb (cr, 1, 0, 0); + cairo_stroke (cr); + cairo_move_to (cr, x_off - extents->x_bearing, y_off - extents->y_bearing); + cairo_set_source_rgb (cr, 0, 0, 0); +#if CAIRO_TEST_GENERATE_REFERENCE_IMAGE + cairo_text_path (cr, text); + cairo_fill (cr); +#else + cairo_show_text (cr, text); +#endif + cairo_restore (cr); + } +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_text_extents_t extents; + cairo_font_options_t *font_options; + const char text[] = "cairo"; + int x_off, y_off; + cairo_matrix_t m; + + /* paint white so we don't need separate ref images for + * RGB24 and ARGB32 */ + cairo_set_source_rgb (cr, 1., 1., 1.); + cairo_paint (cr); + + cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans", + CAIRO_FONT_SLANT_NORMAL, + CAIRO_FONT_WEIGHT_NORMAL); + cairo_set_font_size (cr, TEXT_SIZE); + + font_options = cairo_font_options_create (); + + cairo_get_font_options (cr, font_options); + cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF); + + cairo_set_font_options (cr, font_options); + cairo_font_options_destroy (font_options); + + cairo_set_source_rgb (cr, 0, 0, 0); + + cairo_translate (cr, WIDTH/2.0, HEIGHT/2.0); + + cairo_text_extents (cr, text, &extents); + + if (NUM_TEXT == 1) { + x_off = y_off = 0; + } else { + y_off = - floor (0.5 + extents.height / 2.0); + x_off = floor (0.5 + (extents.height+1) / (2 * tan (M_PI/NUM_TEXT))); + } + + cairo_save (cr); + cairo_matrix_init_identity (&m); + draw_quadrant (cr, text, &extents, &m, x_off, y_off); + cairo_matrix_init (&m, 0, 1, -1, 0, 0, 0); + draw_quadrant (cr, text, &extents, &m, x_off, y_off); + cairo_restore (cr); + + cairo_save (cr); + cairo_scale (cr, -1, -1); + cairo_matrix_init_identity (&m); + draw_quadrant (cr, text, &extents, &m, x_off, y_off); + cairo_matrix_init (&m, 0, 1, -1, 0, 0, 0); + draw_quadrant (cr, text, &extents, &m, x_off, y_off); + cairo_restore (cr); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (text_rotate, + "Tests show_text under various rotations", + "text, transform", /* keywords */ + NULL, /* requirements */ + WIDTH, HEIGHT, + NULL, draw) |