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/*
* Copyright © 2021 Adrian Johnson
*
* 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: Adrian Johnson <ajohnson@redneon.com>
*/
/* Test pdf-operators text positioning. This test is designed to expose rounding
* errors in the PDF operations for relative positioning in very long strings.
*
* The text width is expected to match the width of the rectangle
* enclosing the text.
*/
#include "cairo-test.h"
#define WIDTH 10000
#define HEIGHT 60
/* Using a non integer size helps expose rounding errors */
#define FONT_SIZE 10.12345678912345
#define WORD "Text"
#define NUM_WORDS 450
#define BORDER 10
static cairo_user_data_key_t font_face_key;
static cairo_status_t
user_font_init (cairo_scaled_font_t *scaled_font,
cairo_t *cr,
cairo_font_extents_t *metrics)
{
cairo_font_face_t *font_face = cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&font_face_key);
cairo_set_font_face (cr, font_face);
cairo_font_extents (cr, metrics);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
user_font_render_glyph (cairo_scaled_font_t *scaled_font,
unsigned long index,
cairo_t *cr,
cairo_text_extents_t *metrics)
{
char text[2];
cairo_font_face_t *font_face = cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&font_face_key);
text[0] = index; /* Only using ASCII for this test */
text[1] = 0;
cairo_set_font_face (cr, font_face);
cairo_text_extents (cr, text, metrics);
cairo_text_path (cr, text);
cairo_fill (cr);
return CAIRO_STATUS_SUCCESS;
}
static cairo_font_face_t *
create_user_font_face (cairo_font_face_t *orig_font)
{
cairo_font_face_t *user_font_face;
user_font_face = cairo_user_font_face_create ();
cairo_user_font_face_set_init_func (user_font_face, user_font_init);
cairo_user_font_face_set_render_glyph_func (user_font_face, user_font_render_glyph);
cairo_font_face_set_user_data (user_font_face, &font_face_key, (void*) orig_font, NULL);
return user_font_face;
}
static void
draw_text (cairo_t *cr, const char *text)
{
cairo_text_extents_t extents;
cairo_move_to (cr, BORDER, BORDER);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_show_text (cr, text);
cairo_text_extents (cr, text,&extents);
cairo_rectangle (cr,
BORDER + extents.x_bearing,
BORDER + extents.y_bearing,
extents.width,
extents.height);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
int i;
char *text;
cairo_font_face_t *font_face;
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_select_font_face (cr, "Dejavu Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, FONT_SIZE);
text = malloc (strlen(WORD) * NUM_WORDS + 1);
text[0] = '\0';
for (i = 0; i < NUM_WORDS; i++)
strcat (text, WORD);
cairo_save (cr);
cairo_translate (cr, BORDER, BORDER);
draw_text (cr, text);
cairo_restore (cr);
font_face = create_user_font_face (cairo_get_font_face (cr));
cairo_set_font_face (cr, font_face);
cairo_font_face_destroy (font_face);
cairo_set_font_size (cr, FONT_SIZE);
cairo_save (cr);
cairo_translate (cr, BORDER, BORDER*3);
draw_text (cr, text);
cairo_restore (cr);
free (text);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (pdf_operators_text,
"Test pdf-operators.c glyph positioning",
"pdf", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw)
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