[cairo-user-font] Implement user fonts

1 files changed, 236 insertions, 0 deletions

diff --git a/test/user-font.c b/test/user-font.c
new file mode 100644
index 000000000..3cdf7bc91
--- /dev/null
+++ b/test/user-font.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright © 2006, 2008 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.
+ *
+ * Contributor(s):
+ *	Kristian Høgsberg <krh@redhat.com>
+ *	Behdad Esfahbod <behdad@behdad.org>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "cairo-test.h"
+
+/*#define ROTATED 1*/
+
+#define BORDER 10
+#define TEXT_SIZE 64
+#define WIDTH  (TEXT_SIZE * 9.75 + 2*BORDER)
+#define HEIGHT ((TEXT_SIZE + 2*BORDER)*2)
+#define TEXT   "cairo user font"
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "user-font",
+    "Tests user font feature",
+#ifndef ROTATED
+    WIDTH, HEIGHT,
+#else
+    WIDTH, WIDTH,
+#endif
+    draw
+};
+
+/* Simple glyph definition: 1 - 15 means lineto (or moveto for first
+ * point) for one of the points on this grid:
+ *
+ *      1  2  3
+ *      4  5  6
+ *      7  8  9
+ * ----10 11 12----(baseline)
+ *     13 14 15
+ */
+
+#define END_GLYPH 0
+#define STROKE 13
+#define CLOSE 14
+
+static const struct {
+    unsigned long ucs4;
+    int width;
+    char data[16];
+} glyphs [] = {
+    { -1 ,  0, { END_GLYPH } },
+    { ' ',  1, { END_GLYPH } },
+    { 'c',  3, { 6, 4, 10, 12, STROKE, END_GLYPH } },
+    { 'a',  3, { 4, 6, 12, 10, 7, 8, STROKE, END_GLYPH } },
+    { 'i',  1, { 1, 1, STROKE, 4, 10, STROKE, END_GLYPH } },
+    { 'r',  3, { 4, 10, STROKE, 7, 5, 6, STROKE, END_GLYPH } },
+    { 'o',  3, { 4, 10, 12, 6, CLOSE, END_GLYPH } },
+    { 'u',  3, { 4, 10, 12, 6, STROKE, END_GLYPH } },
+    { 's',  3, { 6, 4, 7, 9, 12, 10, STROKE, END_GLYPH } },
+    { 'e',  3, { 12, 10, 4, 6, 9, 8, STROKE, END_GLYPH } },
+    { 'f',  3, { 3, 2, 11, STROKE, 4, 6, STROKE, END_GLYPH } },
+    { 'n',  3, { 10, 4, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
+    { 't',  3, { 2, 11, 12, STROKE, 4, 6, STROKE, END_GLYPH } },
+    { 'h',  3, { 1, 10, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
+    { 'l',  1, { 1, 10, STROKE, END_GLYPH } },
+    { '-',  2, { 7, 8, STROKE, END_GLYPH } },
+    { '\0', 0, { END_GLYPH } },
+};
+
+static cairo_status_t
+test_scaled_font_init (cairo_scaled_font_t  *scaled_font,
+		       cairo_font_extents_t *metrics)
+{
+  metrics->ascent  = .75;
+  metrics->descent = .25;
+  return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+test_scaled_font_unicode_to_glyph (cairo_scaled_font_t *scaled_font,
+				   unsigned long        unicode,
+				   unsigned long       *glyph)
+{
+    int i;
+
+    for (i = 0; glyphs[i].ucs4 != '\0'; i++)
+	if (glyphs[i].ucs4 == unicode) {
+	    *glyph = i;
+	    return CAIRO_STATUS_SUCCESS;
+	}
+
+    /* Fall through and default to undefined glyph. */
+    return CAIRO_STATUS_INVALID_INDEX;
+}
+
+static cairo_status_t
+test_scaled_font_render_glyph (cairo_scaled_font_t  *scaled_font,
+			       unsigned long         glyph,
+			       cairo_t              *cr,
+			       cairo_text_extents_t *metrics)
+{
+    int i;
+    const char *data;
+    div_t d;
+    double x, y;
+
+    metrics->x_advance = glyphs[glyph].width / 4.0;
+
+    cairo_set_line_width (cr, 0.1);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+
+    data = glyphs[glyph].data;
+    for (i = 0; data[i] != END_GLYPH; i++) {
+	switch (data[i]) {
+	case STROKE:
+	    cairo_new_sub_path (cr);
+	    break;
+
+	case CLOSE:
+	    cairo_close_path (cr);
+	    break;
+
+	default:
+	    d = div (data[i] - 1, 3);
+	    x = d.rem / 4.0 + 0.125;
+	    y = d.quot / 5.0 + 0.4 - 1.0;
+	    cairo_line_to (cr, x, y);
+	}
+    }
+    cairo_stroke (cr);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_font_face_t *
+get_user_font_face (void)
+{
+    static cairo_font_face_t *user_font_face = NULL;
+
+    if (!user_font_face) {
+	user_font_face = cairo_user_font_face_create ();
+	cairo_user_font_face_set_init_func             (user_font_face, test_scaled_font_init);
+	cairo_user_font_face_set_render_glyph_func     (user_font_face, test_scaled_font_render_glyph);
+	cairo_user_font_face_set_unicode_to_glyph_func (user_font_face, test_scaled_font_unicode_to_glyph);
+    }
+
+    return user_font_face;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    const char text[] = TEXT;
+    cairo_font_extents_t font_extents;
+    cairo_text_extents_t extents;
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+#ifdef ROTATED
+    cairo_translate (cr, TEXT_SIZE, 0);
+    cairo_rotate (cr, .6);
+#endif
+
+    cairo_set_font_face (cr, get_user_font_face ());
+    cairo_set_font_size (cr, TEXT_SIZE);
+
+    cairo_font_extents (cr, &font_extents);
+    cairo_text_extents (cr, text, &extents);
+
+    /* logical boundaries in red */
+    cairo_move_to (cr, 0, BORDER);
+    cairo_rel_line_to (cr, WIDTH, 0);
+    cairo_move_to (cr, 0, BORDER + font_extents.ascent);
+    cairo_rel_line_to (cr, WIDTH, 0);
+    cairo_move_to (cr, 0, BORDER + font_extents.ascent + font_extents.descent);
+    cairo_rel_line_to (cr, WIDTH, 0);
+    cairo_move_to (cr, BORDER, 0);
+    cairo_rel_line_to (cr, 0, 2*BORDER + TEXT_SIZE);
+    cairo_move_to (cr, BORDER + extents.x_advance, 0);
+    cairo_rel_line_to (cr, 0, 2*BORDER + TEXT_SIZE);
+    cairo_set_source_rgba (cr, 1, 0, 0, .8);
+    cairo_set_line_width (cr, 2);
+    cairo_stroke (cr);
+
+    /* ink boundaries in green */
+    cairo_rectangle (cr,
+		     BORDER + extents.x_bearing, BORDER + font_extents.ascent + extents.y_bearing,
+		     extents.width, extents.height);
+    cairo_set_source_rgba (cr, 0, 1, 0, .8);
+    cairo_set_line_width (cr, 2);
+    cairo_stroke (cr);
+
+    /* text in gray */
+    cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
+    cairo_move_to (cr, BORDER, BORDER + font_extents.ascent);
+    cairo_show_text (cr, text);
+
+
+    /* filled version of text in light blue */
+    cairo_set_source_rgba (cr, 0, 0, 1, 0.5);
+    cairo_move_to (cr, BORDER, BORDER + font_extents.height + 2*BORDER + font_extents.ascent);
+    cairo_text_path (cr, text);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}