Grcov report - pdf-operators-text.c

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/*

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 * Copyright © 2021 Adrian Johnson

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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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 * 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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 * Author: Adrian Johnson <ajohnson@redneon.com>

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*/

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/* Test pdf-operators text positioning. This test is designed to expose rounding

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 * errors in the PDF operations for relative positioning in very long strings.

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 * The text width is expected to match the width of the rectangle

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 * enclosing the text.

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*/

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#include "cairo-test.h"

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#define WIDTH  10000

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#define HEIGHT 60

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/* Using a non integer size helps expose rounding errors */

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#define FONT_SIZE 10.12345678912345

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#define WORD "Text"

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#define NUM_WORDS 450

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#define BORDER 10

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static cairo_user_data_key_t font_face_key;

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static cairo_status_t

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3

user_font_init (cairo_scaled_font_t  *scaled_font,

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                cairo_t              *cr,

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                cairo_font_extents_t *metrics)

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    cairo_font_face_t *font_face = cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),

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                                                                  &font_face_key);

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3

    cairo_set_font_face (cr, font_face);

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    cairo_font_extents (cr, metrics);

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    return CAIRO_STATUS_SUCCESS;

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static cairo_status_t

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user_font_render_glyph (cairo_scaled_font_t  *scaled_font,

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                        unsigned long         index,

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                        cairo_t              *cr,

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                        cairo_text_extents_t *metrics)

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    char text[2];

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    cairo_font_face_t *font_face = cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),

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                                                                  &font_face_key);

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    text[0] = index; /* Only using ASCII for this test */

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    text[1] = 0;

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    cairo_set_font_face (cr, font_face);

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    cairo_text_extents (cr, text, metrics);

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    cairo_text_path (cr, text);

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    cairo_fill (cr);

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    return CAIRO_STATUS_SUCCESS;

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static cairo_font_face_t *

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create_user_font_face (cairo_font_face_t *orig_font)

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    cairo_font_face_t *user_font_face;

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    user_font_face = cairo_user_font_face_create ();

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    cairo_user_font_face_set_init_func (user_font_face, user_font_init);

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    cairo_user_font_face_set_render_glyph_func (user_font_face, user_font_render_glyph);

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    cairo_font_face_set_user_data (user_font_face, &font_face_key, (void*) orig_font, NULL);

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    return user_font_face;

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static void

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draw_text (cairo_t *cr, const char *text)

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    cairo_text_extents_t extents;

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    cairo_move_to (cr, BORDER, BORDER);

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    cairo_set_source_rgb (cr, 0, 0, 0);

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    cairo_show_text (cr, text);

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    cairo_text_extents (cr, text,&extents);

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    cairo_rectangle (cr,

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                     BORDER + extents.x_bearing,

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                     BORDER + extents.y_bearing,

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                     extents.width,

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                     extents.height);

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    cairo_set_line_width (cr, 1);

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    cairo_stroke (cr);

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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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    int i;

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    char *text;

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    cairo_font_face_t *font_face;

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    cairo_set_source_rgb (cr, 1, 1, 1);

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    cairo_paint (cr);

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    cairo_select_font_face (cr, "Dejavu 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, FONT_SIZE);

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    text = malloc (strlen(WORD) * NUM_WORDS + 1);

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    text[0] = '\0';

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    for (i = 0; i < NUM_WORDS; i++)

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	strcat (text, WORD);

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    cairo_save (cr);

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    cairo_translate (cr, BORDER, BORDER);

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    draw_text (cr, text);

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    cairo_restore (cr);

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    font_face = create_user_font_face (cairo_get_font_face (cr));

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    cairo_set_font_face (cr, font_face);

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    cairo_font_face_destroy (font_face);

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    cairo_set_font_size (cr, FONT_SIZE);

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    cairo_save (cr);

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    cairo_translate (cr, BORDER, BORDER*3);

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    draw_text (cr, text);

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    cairo_restore (cr);

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    free (text);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (pdf_operators_text,

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	    "Test pdf-operators.c glyph positioning",

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	    "pdf", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)