Grcov report - text-glyph-range.c

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/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */

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/* cairo - a vector graphics library with display and print output

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 * Copyright © 2006 Brian Ewins.

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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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 * Brian Ewins 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. Brian Ewins 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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 * BRIAN EWINS 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 BRIAN EWINS 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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 * Author: Brian Ewins <Brian.Ewins@gmail.com>

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*/

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/* Related to bug 9530

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 * cairo_glyph_t can contain any unsigned long in its 'index', the intention

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 * being that it is large enough to hold a pointer. However, this means that

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 * it can specify many glyph indexes which don't exist in the font, and may

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 * exceed the range of legal glyph indexes for the font backend. It may

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 * also contain special values that are not usable as indexes - e.g. 0xffff is

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 * kATSDeletedGlyphcode in ATSUI, a glyph that should not be drawn.

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 * The font backends should handle all legal and out-of-range values

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 * consistently.

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 * This test expects that operations on out-of-range and missing glyphs should

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 * act as if they were zero-width.

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*/

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#include "cairo-test.h"

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#define WIDTH  100

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#define HEIGHT 75

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#define NUM_TEXT 20

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#define TEXT_SIZE 12

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    cairo_text_extents_t extents;

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    int i;

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    /* Glyphs with no paths followed by 'cairo', the additional

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     * text is to make the space obvious.

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*/

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    long int index[] = {

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	0, /* 'no matching glyph' */

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	0xffff, /* kATSDeletedGlyphCode */

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	0x1ffff, /* out of range */

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	-1L, /* out of range */

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	70, 68, 76, 85, 82 /* 'cairo' */

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};

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    /* We draw in the default black, so paint white first. */

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    cairo_save (cr);

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    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */

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    cairo_paint (cr);

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    cairo_restore (cr);

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    cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",

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			    CAIRO_FONT_SLANT_NORMAL,

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			    CAIRO_FONT_WEIGHT_NORMAL);

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    cairo_set_font_size (cr, 16);

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    for (i = 0; i < 9; i++) {

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	/* since we're just drawing glyphs directly we need to position them. */

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	cairo_glyph_t glyph = {

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	    index[i], 10 * i, 25

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};

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	/* test cairo_glyph_extents. Every glyph index should

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	 * have extents, invalid glyphs should be zero-width.

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*/

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	cairo_move_to (cr, glyph.x, glyph.y);

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	cairo_set_line_width (cr, 1.0);

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	cairo_glyph_extents (cr, &glyph, 1, &extents);

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	cairo_rectangle (cr,

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			 glyph.x + extents.x_bearing - 0.5,

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			 glyph.y + extents.y_bearing - 0.5,

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			 extents.width + 1,

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			 extents.height + 1);

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	cairo_set_source_rgb (cr, 1, 0, 0); /* red */

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	cairo_stroke (cr);

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	/* test cairo_show_glyphs. Every glyph index should be

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	 * drawable, invalid glyph indexes should draw nothing.

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*/

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	cairo_set_source_rgb (cr, 0, 0, 0); /* black */

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	cairo_show_glyphs (cr, &glyph, 1);

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	cairo_move_to (cr, glyph.x, glyph.y);

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	/* test cairo_glyph_path. Every glyph index should produce

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	 * a path, invalid glyph indexes should have empty paths.

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*/

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	/* Change the glyph position

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	 * so that the paths are visible.

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*/

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	glyph.y = 55;

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	cairo_move_to (cr, glyph.x, glyph.y);

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	cairo_glyph_path (cr, &glyph, 1);

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	cairo_fill (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (text_glyph_range,

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	    "Tests show_glyphs, glyph_path, glyph_extents with out of range glyph ids."

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	    "\nft and atsui font backends fail, misreporting errors from FT_Load_Glyph and ATSUGlyphGetCubicPaths",

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	    "text, stress", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)