summaryrefslogtreecommitdiff
path: root/test/get-path-extents.c
diff options
context:
space:
mode:
Diffstat (limited to 'test/get-path-extents.c')
-rw-r--r--test/get-path-extents.c443
1 files changed, 443 insertions, 0 deletions
diff --git a/test/get-path-extents.c b/test/get-path-extents.c
new file mode 100644
index 000000000..075fd6fd6
--- /dev/null
+++ b/test/get-path-extents.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright © 2006 Novell, 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
+ * Novell, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Novell, Inc. makes no representations about the
+ * suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * NOVELL, 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: Robert O'Callahan <rocallahan@novell.com>
+ */
+
+#include "cairo-test.h"
+#include <stddef.h>
+#include <math.h>
+
+enum ExtentsType { FILL, STROKE, PATH };
+
+enum Relation { EQUALS, APPROX_EQUALS, CONTAINS };
+
+
+static cairo_bool_t within_tolerance(double x1, double y1,
+ double x2, double y2,
+ double expected_x1, double expected_y1,
+ double expected_x2, double expected_y2,
+ double tolerance)
+{
+ return (fabs (expected_x1 - x1) < tolerance &&
+ fabs (expected_y1 - y1) < tolerance &&
+ fabs (expected_x2 - x2) < tolerance &&
+ fabs (expected_y2 - y2) < tolerance);
+}
+
+static cairo_bool_t
+check_extents (const cairo_test_context_t *ctx,
+ const char *message, cairo_t *cr, enum ExtentsType type,
+ enum Relation relation,
+ double x, double y, double width, double height)
+{
+ double ext_x1, ext_y1, ext_x2, ext_y2;
+ const char *type_string;
+ const char *relation_string;
+
+ switch (type) {
+ default:
+ case FILL:
+ type_string = "fill";
+ cairo_fill_extents (cr, &ext_x1, &ext_y1, &ext_x2, &ext_y2);
+ break;
+ case STROKE:
+ type_string = "stroke";
+ cairo_stroke_extents (cr, &ext_x1, &ext_y1, &ext_x2, &ext_y2);
+ break;
+ case PATH:
+ type_string = "path";
+ cairo_path_extents (cr, &ext_x1, &ext_y1, &ext_x2, &ext_y2);
+ break;
+ }
+
+ /* ignore results after an error occurs */
+ if (cairo_status (cr))
+ return 1;
+
+ switch (relation) {
+ default:
+ case EQUALS:
+ relation_string = "equal";
+ if (within_tolerance(x, y, x + width, y + height,
+ ext_x1, ext_y1, ext_x2, ext_y2,
+ cairo_get_tolerance(cr)))
+ return 1;
+ break;
+ case APPROX_EQUALS:
+ relation_string = "approx. equal";
+ if (within_tolerance(x, y, x + width, y + height,
+ ext_x1, ext_y1, ext_x2, ext_y2,
+ 1.))
+ return 1;
+ break;
+ case CONTAINS:
+ relation_string = "contain";
+ if (width == 0 || height == 0) {
+ /* odd test that doesn't really test anything... */
+ return 1;
+ }
+ if (ext_x1 <= x && ext_y1 <= y && ext_x2 >= x + width && ext_y2 >= y + height)
+ return 1;
+ break;
+ }
+
+ cairo_test_log (ctx, "Error: %s; %s extents (%g, %g) x (%g, %g) should %s (%g, %g) x (%g, %g)\n",
+ message, type_string,
+ ext_x1, ext_y1, ext_x2 - ext_x1, ext_y2 - ext_y1,
+ relation_string,
+ x, y, width, height);
+ return 0;
+}
+
+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_surface_t *surface;
+ cairo_t *cr2;
+ const char *phase;
+ const char string[] = "The quick brown fox jumps over the lazy dog.";
+ cairo_text_extents_t extents, scaled_font_extents;
+ cairo_status_t status;
+ int errors = 0;
+
+ surface = cairo_surface_create_similar (cairo_get_group_target (cr),
+ CAIRO_CONTENT_COLOR, 1000, 1000);
+ /* don't use cr accidentally */
+ cr = NULL;
+ cr2 = cairo_create (surface);
+ cairo_surface_destroy (surface);
+
+ cairo_set_line_width (cr2, 10);
+ cairo_set_line_join (cr2, CAIRO_LINE_JOIN_MITER);
+ cairo_set_miter_limit (cr2, 100);
+
+ phase = "No path";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 0, 0, 0, 0);
+
+ cairo_save (cr2);
+
+ cairo_new_path (cr2);
+ cairo_move_to (cr2, 200, 400);
+ cairo_close_path (cr2);
+ phase = "Degenerate closed path";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_move_to (cr2, 200, 400);
+ cairo_rel_line_to (cr2, 0., 0.);
+ phase = "Degenerate line";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_move_to (cr2, 200, 400);
+ cairo_rel_curve_to (cr2, 0., 0., 0., 0., 0., 0.);
+ phase = "Degenerate curve";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_arc (cr2, 200, 400, 0., 0, 2 * M_PI);
+ phase = "Degenerate arc (R=0)";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_arc_negative (cr2, 200, 400, 0., 0, 2 * M_PI);
+ phase = "Degenerate negative arc (R=0)";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_arc (cr2, 200, 400, 10., 0, 0);
+ phase = "Degenerate arc (Θ=0)";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 210, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_arc_negative (cr2, 200, 400, 10., 0, 0);
+ phase = "Degenerate negative arc (Θ=0)";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 210, 400, 0, 0);
+
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ /* Test that with CAIRO_LINE_CAP_ROUND, we get "dots" from
+ * cairo_move_to; cairo_rel_line_to(0,0) */
+ cairo_save (cr2);
+
+ cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_width (cr2, 20);
+
+ cairo_move_to (cr2, 200, 400);
+ cairo_rel_line_to (cr2, 0, 0);
+ phase = "Single 'dot'";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, APPROX_EQUALS, 190, 390, 20, 20);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+ /* Add another dot without starting a new path */
+ cairo_move_to (cr2, 100, 500);
+ cairo_rel_line_to (cr2, 0, 0);
+ phase = "Multiple 'dots'";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, APPROX_EQUALS, 90, 390, 120, 120);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 100, 400, 100, 100);
+
+ cairo_new_path (cr2);
+
+ cairo_restore (cr2);
+
+ /* http://bugs.freedesktop.org/show_bug.cgi?id=7965 */
+ phase = "A horizontal, open path";
+ cairo_save (cr2);
+ cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
+ cairo_move_to (cr2, 0, 180);
+ cairo_line_to (cr2, 750, 180);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, -5, 175, 760, 10);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 0, 180, 750, 0);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "A vertical, open path";
+ cairo_save (cr2);
+ cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
+ cairo_new_path (cr2);
+ cairo_move_to (cr2, 180, 0);
+ cairo_line_to (cr2, 180, 750);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 175, -5, 10, 760);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 180, 0, 0, 750);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "A degenerate open path";
+ cairo_save (cr2);
+ cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
+ cairo_new_path (cr2);
+ cairo_move_to (cr2, 180, 0);
+ cairo_line_to (cr2, 180, 0);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 175, -5, 10, 10);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 180, 0, 0, 0);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "Simple rect";
+ cairo_save (cr2);
+ cairo_rectangle (cr2, 10, 10, 80, 80);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 80, 80);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 5, 5, 90, 90);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 80, 80);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "Two rects";
+ cairo_save (cr2);
+ cairo_rectangle (cr2, 10, 10, 10, 10);
+ cairo_rectangle (cr2, 20, 20, 10, 10);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 20, 20);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 5, 5, 30, 30);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 20, 20);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "Triangle";
+ cairo_save (cr2);
+ cairo_move_to (cr2, 10, 10);
+ cairo_line_to (cr2, 90, 90);
+ cairo_line_to (cr2, 90, 10);
+ cairo_close_path (cr2);
+ /* miter joins protrude 5*(1+sqrt(2)) above the top-left corner and to
+ the right of the bottom-right corner */
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 80, 80);
+ errors += !check_extents (ctx, phase, cr2, STROKE, CONTAINS, 0, 5, 95, 95);
+ errors += !check_extents (ctx, phase, cr2, PATH, CONTAINS, 10, 10, 80, 80);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ cairo_save (cr2);
+
+ cairo_set_line_width (cr2, 4);
+
+ cairo_rectangle (cr2, 10, 10, 30, 30);
+ cairo_rectangle (cr2, 25, 10, 15, 30);
+
+ cairo_set_fill_rule (cr2, CAIRO_FILL_RULE_EVEN_ODD);
+ phase = "EVEN_ODD overlapping rectangles";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 15, 30);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 8, 8, 34, 34);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 30, 30);
+
+ /* Test other fill rule with the same path. */
+
+ cairo_set_fill_rule (cr2, CAIRO_FILL_RULE_WINDING);
+ phase = "WINDING overlapping rectangles";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 30, 30);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 8, 8, 34, 34);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 30, 30);
+
+ /* Now, change the direction of the second rectangle and test both
+ * fill rules again. */
+ cairo_new_path (cr2);
+ cairo_rectangle (cr2, 10, 10, 30, 30);
+ cairo_rectangle (cr2, 25, 40, 15, -30);
+
+ cairo_set_fill_rule (cr2, CAIRO_FILL_RULE_EVEN_ODD);
+ phase = "EVEN_ODD overlapping rectangles";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 15, 30);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 8, 8, 34, 34);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 30, 30);
+
+ /* Test other fill rule with the same path. */
+
+ cairo_set_fill_rule (cr2, CAIRO_FILL_RULE_WINDING);
+ phase = "WINDING overlapping rectangles";
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 15, 30);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 8, 8, 34, 34);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 30, 30);
+
+ cairo_new_path (cr2);
+
+ cairo_restore (cr2);
+
+ /* http://bugs.freedesktop.org/show_bug.cgi?id=7245 */
+ phase = "Arc";
+ cairo_save (cr2);
+ cairo_arc (cr2, 250.0, 250.0, 157.0, 5.147, 3.432);
+ cairo_set_line_width (cr2, 154.0);
+ errors += !check_extents (ctx, phase, cr2, STROKE, APPROX_EQUALS, 16, 38, 468, 446);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "Text";
+ cairo_save (cr2);
+ cairo_select_font_face (cr2, CAIRO_TEST_FONT_FAMILY " Sans",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+ cairo_set_font_size (cr2, 12);
+ cairo_text_extents (cr2, string, &extents);
+ /* double check that the two methods of measuring the text agree... */
+ cairo_scaled_font_text_extents (cairo_get_scaled_font (cr2),
+ string,
+ &scaled_font_extents);
+ if (memcmp (&extents, &scaled_font_extents, sizeof (extents))) {
+ cairo_test_log (ctx, "Error: cairo_text_extents() does not match cairo_scaled_font_text_extents() - font extents (%f, %f) x (%f, %f) should be (%f, %f) x (%f, %f)\n",
+ scaled_font_extents.x_bearing,
+ scaled_font_extents.y_bearing,
+ scaled_font_extents.width,
+ scaled_font_extents.height,
+ extents.x_bearing,
+ extents.y_bearing,
+ extents.width,
+ extents.height);
+ errors++;
+ }
+
+ cairo_move_to (cr2, -extents.x_bearing, -extents.y_bearing);
+ cairo_text_path (cr2, string);
+ cairo_set_line_width (cr2, 2.0);
+ /* XXX: We'd like to be able to use EQUALS here, but currently
+ * when hinting is enabled freetype returns integer extents. See
+ * http://cairographics.org/todo */
+ errors += !check_extents (ctx, phase, cr2, FILL, APPROX_EQUALS,
+ 0, 0, extents.width, extents.height);
+ errors += !check_extents (ctx, phase, cr2, STROKE, APPROX_EQUALS,
+ -1, -1, extents.width+2, extents.height+2);
+ errors += !check_extents (ctx, phase, cr2, PATH, APPROX_EQUALS,
+ 0, 0, extents.width, extents.height);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "User space, simple scale, getting extents with same transform";
+ cairo_save (cr2);
+ cairo_scale (cr2, 2, 2);
+ cairo_rectangle (cr2, 5, 5, 40, 40);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 5, 5, 40, 40);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 50, 50);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 5, 5, 40, 40);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "User space, simple scale, getting extents with no transform";
+ cairo_save (cr2);
+ cairo_save (cr2);
+ cairo_scale (cr2, 2, 2);
+ cairo_rectangle (cr2, 5, 5, 40, 40);
+ cairo_restore (cr2);
+ errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 10, 10, 80, 80);
+ errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 5, 5, 90, 90);
+ errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 10, 10, 80, 80);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ phase = "User space, rotation, getting extents with transform";
+ cairo_save (cr2);
+ cairo_rectangle (cr2, -50, -50, 50, 50);
+ cairo_rotate (cr2, -M_PI/4);
+ /* the path in user space is now (nearly) the square rotated by
+ 45 degrees about the origin. Thus its x1 and x2 are both nearly 0.
+ This should show any bugs where we just transform device-space
+ x1,y1 and x2,y2 to get the extents. */
+ /* The largest axis-aligned square inside the rotated path has
+ side lengths 50*sqrt(2), so a bit over 35 on either side of
+ the axes. With the stroke width added to the rotated path,
+ the largest axis-aligned square is a bit over 38 on either side of
+ the axes. */
+ errors += !check_extents (ctx, phase, cr2, FILL, CONTAINS, -35, -35, 35, 35);
+ errors += !check_extents (ctx, phase, cr2, STROKE, CONTAINS, -38, -38, 38, 38);
+ errors += !check_extents (ctx, phase, cr2, PATH, CONTAINS, -35, -35, 35, 35);
+ cairo_new_path (cr2);
+ cairo_restore (cr2);
+
+ status = cairo_status (cr2);
+ cairo_destroy (cr2);
+
+ if (status)
+ return cairo_test_status_from_status (ctx, status);
+
+ return errors == 0 ? CAIRO_TEST_SUCCESS : CAIRO_TEST_FAILURE;
+}
+
+CAIRO_TEST (get_path_extents,
+ "Test cairo_fill_extents and cairo_stroke_extents",
+ "extents, path", /* keywords */
+ NULL, /* requirements */
+ 0, 0,
+ NULL, draw)
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-20 08:49:57 +0000