/* * Copyright © 2006 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: Behdad Esfahbod */ /* Related bug 5177 * * In short: * * _cairo_atsui_font_text_to_glyph with a zero-sized string crashes. * * Moreover, the fallback path in cairo_scaled_font_text_to_glyphs() * when handling a zero-sized string, allocates a zero-sized glyph array * and when NULL is returned by malloc, recognizes that as an out-of-memory * error. The glibc implementation of malloc() does not return NULL from * malloc(0), but I don't think it's a safe assumption. * * By just bailing out on zero-sized text, we fix both issues. */ #include "cairo-test.h" #define NUM_TEXT 20 #define TEXT_SIZE 12 static cairo_bool_t text_extents_equal (const cairo_text_extents_t *A, const cairo_text_extents_t *B) { return A->x_bearing == B->x_bearing && A->y_bearing == B->y_bearing && A->width == B->width && A->height == B->height && A->x_advance == B->x_advance && A->y_advance == B->y_advance; } static cairo_bool_t font_extents_equal (const cairo_font_extents_t *A, const cairo_font_extents_t *B) { return A->ascent == B->ascent && A->descent == B->descent && A->height == B->height && A->max_x_advance == B->max_x_advance && A->max_y_advance == B->max_y_advance; } static cairo_test_status_t draw (cairo_t *cr, int width, int height) { const cairo_test_context_t *ctx = cairo_test_get_context (cr); cairo_text_extents_t extents, nil_extents; cairo_font_extents_t font_extents, nil_font_extents; cairo_scaled_font_t *scaled_font; cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); cairo_set_font_size (cr, 16); cairo_move_to (cr, 10, 25); cairo_show_text (cr, NULL); cairo_show_text (cr, ""); cairo_show_glyphs (cr, NULL, 0); cairo_show_glyphs (cr, (void*)8, 0); cairo_move_to (cr, 10, 55); cairo_text_path (cr, NULL); cairo_text_path (cr, ""); cairo_glyph_path (cr, (void*)8, 0); cairo_fill (cr); memset (&nil_extents, 0, sizeof (cairo_text_extents_t)); memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_text_extents (cr, "", &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_text_extents (cr, NULL, &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_glyph_extents (cr, (void*)8, 0, &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_glyph_extents(); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } scaled_font = cairo_get_scaled_font (cr); memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_scaled_font_text_extents (scaled_font, "", &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_scaled_font_text_extents (scaled_font, NULL, &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_scaled_font_glyph_extents (scaled_font, (void*)8, 0, &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_scaled_font_glyph_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } /* Lets also try font size 0 while here */ cairo_set_font_size (cr, 0); memset (&extents, 0xff, sizeof (cairo_text_extents_t)); cairo_text_extents (cr, "test", &extents); if (! text_extents_equal (&extents, &nil_extents)) { cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_text_extents(\"test\"); extents (%g, %g, %g, %g, %g, %g)\n", extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance, extents.y_advance); return CAIRO_TEST_FAILURE; } memset (&nil_font_extents, 0, sizeof (cairo_font_extents_t)); memset (&font_extents, 0xff, sizeof (cairo_font_extents_t)); cairo_font_extents (cr, &font_extents); if (! font_extents_equal (&font_extents, &nil_font_extents)) { cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_font_extents(); extents (%g, %g, %g, %g, %g)\n", font_extents.ascent, font_extents.descent, font_extents.height, font_extents.max_x_advance, font_extents.max_y_advance); return CAIRO_TEST_FAILURE; } scaled_font = cairo_get_scaled_font (cr); memset (&font_extents, 0xff, sizeof (cairo_font_extents_t)); cairo_scaled_font_extents (scaled_font, &font_extents); if (! font_extents_equal (&font_extents, &nil_font_extents)) { cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_scaled_font_extents(); extents (%g, %g, %g, %g, %g)\n", font_extents.ascent, font_extents.descent, font_extents.height, font_extents.max_x_advance, font_extents.max_y_advance); return CAIRO_TEST_FAILURE; } return CAIRO_TEST_SUCCESS; } CAIRO_TEST (text_zero_len, "Tests show_text and text_path with a zero-sized string", "text, stress, extents", /* keywords */ NULL, /* requirements */ 0, 0, NULL, draw)