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Diffstat (limited to 'test/text-glyph-range.c')
| -rw-r--r-- | test/text-glyph-range.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/test/text-glyph-range.c b/test/text-glyph-range.c new file mode 100644 index 000000000..75b87d63a --- /dev/null +++ b/test/text-glyph-range.c @@ -0,0 +1,125 @@ +/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2006 Brian Ewins. + * + * 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 + * Brian Ewins not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Brian Ewins makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * BRIAN EWINS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL BRIAN EWINS 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: Brian Ewins <Brian.Ewins@gmail.com> + */ + +/* Related to bug 9530 + * + * cairo_glyph_t can contain any unsigned long in its 'index', the intention + * being that it is large enough to hold a pointer. However, this means that + * it can specify many glyph indexes which don't exist in the font, and may + * exceed the range of legal glyph indexes for the font backend. It may + * also contain special values that are not usable as indexes - e.g. 0xffff is + * kATSDeletedGlyphcode in ATSUI, a glyph that should not be drawn. + * The font backends should handle all legal and out-of-range values + * consistently. + * + * This test expects that operations on out-of-range and missing glyphs should + * act as if they were zero-width. + */ + +#include "cairo-test.h" + +#define WIDTH 100 +#define HEIGHT 75 +#define NUM_TEXT 20 +#define TEXT_SIZE 12 + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_text_extents_t extents; + int i; + /* Glyphs with no paths followed by 'cairo', the additional + * text is to make the space obvious. + */ + long int index[] = { + 0, /* 'no matching glyph' */ + 0xffff, /* kATSDeletedGlyphCode */ + 0x1ffff, /* out of range */ + -1L, /* out of range */ + 70, 68, 76, 85, 82 /* 'cairo' */ + }; + + /* We draw in the default black, so paint white first. */ + cairo_save (cr); + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */ + cairo_paint (cr); + cairo_restore (cr); + + cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans", + CAIRO_FONT_SLANT_NORMAL, + CAIRO_FONT_WEIGHT_NORMAL); + cairo_set_font_size (cr, 16); + + for (i = 0; i < 9; i++) { + /* since we're just drawing glyphs directly we need to position them. */ + cairo_glyph_t glyph = { + index[i], 10 * i, 25 + }; + + /* test cairo_glyph_extents. Every glyph index should + * have extents, invalid glyphs should be zero-width. + */ + cairo_move_to (cr, glyph.x, glyph.y); + cairo_set_line_width (cr, 1.0); + cairo_glyph_extents (cr, &glyph, 1, &extents); + cairo_rectangle (cr, + glyph.x + extents.x_bearing - 0.5, + glyph.y + extents.y_bearing - 0.5, + extents.width + 1, + extents.height + 1); + cairo_set_source_rgb (cr, 1, 0, 0); /* red */ + cairo_stroke (cr); + + /* test cairo_show_glyphs. Every glyph index should be + * drawable, invalid glyph indexes should draw nothing. + */ + cairo_set_source_rgb (cr, 0, 0, 0); /* black */ + cairo_show_glyphs (cr, &glyph, 1); + cairo_move_to (cr, glyph.x, glyph.y); + + /* test cairo_glyph_path. Every glyph index should produce + * a path, invalid glyph indexes should have empty paths. + */ + /* Change the glyph position + * so that the paths are visible. + */ + glyph.y = 55; + cairo_move_to (cr, glyph.x, glyph.y); + cairo_glyph_path (cr, &glyph, 1); + cairo_fill (cr); + } + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (text_glyph_range, + "Tests show_glyphs, glyph_path, glyph_extents with out of range glyph ids." + "\nft and atsui font backends fail, misreporting errors from FT_Load_Glyph and ATSUGlyphGetCubicPaths", + "text, stress", /* keywords */ + NULL, /* requirements */ + WIDTH, HEIGHT, + NULL, draw) |