add cairo

1 files changed, 189 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/text-rotate.c b/libs/cairo-1.16.0/test/text-rotate.c
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+++ b/libs/cairo-1.16.0/test/text-rotate.c
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+/*
+ * Copyright © 2004 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+/* Bug history
+ *
+ * 2004-11-03 Steve Chaplin <stevech1097@yahoo.com.au>
+ *
+ *   Reported bug on mailing list:
+ *
+ *	From: Steve Chaplin <stevech1097@yahoo.com.au>
+ *	To: cairo@cairographics.org
+ *	Date: Thu, 04 Nov 2004 00:00:17 +0800
+ *	Subject: [cairo] Rotated text bug on drawable target
+ *
+ * 	The attached file draws text rotated 90 degrees first to a PNG file and
+ *	then to a drawable. The PNG file looks fine, the text on the drawable is
+ *	unreadable.
+ *
+ *	Steve
+ *
+ * 2004-11-03 Carl Worth <cworth@cworth.org>
+ *
+ *   Looks like the major problems with this bug appeared in the great
+ *   font rework between 0.1.23 and 0.2.0. And it looks like we need
+ *   to fix the regression test suite to test the xlib target (since
+ *   the bug does not show up in the png backend).
+ *
+ *   Hmm... Actually, things don't look perfect even in the PNG
+ *   output. Look at how that 'o' moves around. It's particularly off
+ *   in the case where it's rotated by PI.
+ *
+ *   And I'm still not sure about what to do for test cases with
+ *   text--a new version of freetype will change everything. We may
+ *   need to add a simple backend for stroked fonts and add a simple
+ *   builtin font to cairo for pixel-perfect tests with text.
+ *
+ * 2005-08-23
+ *
+ *   It appears that the worst placement and glyph selection problems
+ *   have now been resolved. In the past some letters were noticeably
+ *   of a different size at some rotations, and there was a lot of
+ *   drift away from the baseline. These problems do not appear
+ *   anymore.
+ *
+ *   Another thing that helps is that we now have font options which
+ *   we can use to disable hinting in order to get more repeatable
+ *   results. I'm doing that in this test now.
+ *
+ *   There are still some subtle positioning problems which I'm
+ *   assuming are due to the lack of finer-than-whole-pixel glyph
+ *   positioning. I'm generating a reference image now by replacing
+ *   cairo_show_text with cairo_text_path; cairo_fill. This will let
+ *   us look more closely at the remaining positioning problems. (In
+ *   particular, I want to make sure we're rounding as well as
+ *   possible).
+ *
+ * 2007-02-21
+ *
+ *   Seems like all the "bugs" have been fixed and all remaining is
+ *   missing support for subpixel glyph positioning.  Removing from
+ *   XFAIL now.
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH  150
+#define HEIGHT 150
+#define NUM_TEXT 20
+#define TEXT_SIZE 12
+
+/* Draw the word cairo at NUM_TEXT different angles.
+ * We separate the circle into quadrants to reduce
+ * numerical errors i.e. so each quarter is pixel-aligned.
+ */
+static void
+draw_quadrant (cairo_t *cr,
+	       const char *text,
+	       const cairo_text_extents_t *extents,
+	       const cairo_matrix_t *transform,
+	       int x_off, int y_off)
+{
+    int i;
+
+    for (i = 0; i < NUM_TEXT/4; i++) {
+	cairo_save (cr);
+	cairo_rotate (cr, 2*M_PI*i/NUM_TEXT);
+	cairo_transform (cr, transform);
+	cairo_set_line_width (cr, 1.0);
+	cairo_rectangle (cr, x_off - 0.5, y_off - 0.5, extents->width + 1, extents->height + 1);
+	cairo_set_source_rgb (cr, 1, 0, 0);
+	cairo_stroke (cr);
+	cairo_move_to (cr, x_off - extents->x_bearing, y_off - extents->y_bearing);
+	cairo_set_source_rgb (cr, 0, 0, 0);
+#if CAIRO_TEST_GENERATE_REFERENCE_IMAGE
+	cairo_text_path (cr, text);
+	cairo_fill (cr);
+#else
+	cairo_show_text (cr, text);
+#endif
+	cairo_restore (cr);
+    }
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_text_extents_t extents;
+    cairo_font_options_t *font_options;
+    const char text[] = "cairo";
+    int x_off, y_off;
+    cairo_matrix_t m;
+
+    /* paint white so we don't need separate ref images for
+     * RGB24 and ARGB32 */
+    cairo_set_source_rgb (cr, 1., 1., 1.);
+    cairo_paint (cr);
+
+    cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_set_font_size (cr, TEXT_SIZE);
+
+    font_options = cairo_font_options_create ();
+
+    cairo_get_font_options (cr, font_options);
+    cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
+
+    cairo_set_font_options (cr, font_options);
+    cairo_font_options_destroy (font_options);
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+
+    cairo_translate (cr, WIDTH/2.0, HEIGHT/2.0);
+
+    cairo_text_extents (cr, text, &extents);
+
+    if (NUM_TEXT == 1) {
+	x_off = y_off = 0;
+    } else {
+	y_off = - floor (0.5 + extents.height / 2.0);
+	x_off = floor (0.5 + (extents.height+1) / (2 * tan (M_PI/NUM_TEXT)));
+    }
+
+    cairo_save (cr);
+    cairo_matrix_init_identity (&m);
+    draw_quadrant (cr, text, &extents, &m, x_off, y_off);
+    cairo_matrix_init (&m, 0, 1, -1, 0, 0, 0);
+    draw_quadrant (cr, text, &extents, &m, x_off, y_off);
+    cairo_restore (cr);
+
+    cairo_save (cr);
+    cairo_scale (cr, -1, -1);
+    cairo_matrix_init_identity (&m);
+    draw_quadrant (cr, text, &extents, &m, x_off, y_off);
+    cairo_matrix_init (&m, 0, 1, -1, 0, 0, 0);
+    draw_quadrant (cr, text, &extents, &m, x_off, y_off);
+    cairo_restore (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (text_rotate,
+	    "Tests show_text under various rotations",
+	    "text, transform", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)