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+/*
+ * Copyright 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+/* Test the fidelity of the rasterisation, because Cairo is my favourite
+ * driver test suite.
+ */
+
+#define SIZE 256
+#define WIDTH 2
+#define HEIGHT 10
+
+static cairo_test_status_t
+rectangles (cairo_t *cr, int width, int height)
+{
+ int i;
+
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+ cairo_paint (cr);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+
+ for (i = 1; i <= SIZE; i++) {
+ int x, y;
+
+ cairo_save (cr);
+ cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+ cairo_clip (cr);
+
+ cairo_scale (cr, 1./SIZE, 1./SIZE);
+ for (x = -i; x < SIZE*WIDTH; x += 2*i) {
+ for (y = -i; y < SIZE*HEIGHT; y += 2*i) {
+ /* Add a little tile composed of two non-overlapping squares
+ * +--+
+ * | |
+ * |__|__
+ * | |
+ * | |
+ * +--+
+ */
+ cairo_rectangle (cr, x, y, i, i);
+ cairo_rectangle (cr, x+i, y+i, i, i);
+ }
+ }
+ cairo_fill (cr);
+ cairo_restore (cr);
+
+ cairo_translate (cr, WIDTH, 0);
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+static cairo_test_status_t
+triangles (cairo_t *cr, int width, int height)
+{
+ int i;
+
+ cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
+ cairo_paint (cr);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+
+ for (i = 1; i <= SIZE; i++) {
+ int x, y;
+
+ cairo_save (cr);
+ cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+ cairo_clip (cr);
+
+ cairo_scale (cr, 1./SIZE, 1./SIZE);
+ for (x = -i; x < SIZE*WIDTH; x += 2*i) {
+ for (y = -i; y < SIZE*HEIGHT; y += 2*i) {
+ /* Add a tile composed of four non-overlapping
+ * triangles. The plus and minus signs inside the
+ * triangles denote the orientation of the triangle's
+ * edges: + for clockwise and - for anticlockwise.
+ *
+ * +-----+
+ * \-|+/
+ * \|/
+ * /|\
+ * /-|-\
+ * +-----+
+ */
+
+ /* top left triangle */
+ cairo_move_to (cr, x, y);
+ cairo_line_to (cr, x+i, y+i);
+ cairo_line_to (cr, x+i, y);
+ cairo_close_path (cr);
+
+ /* top right triangle */
+ cairo_move_to (cr, x+i, y);
+ cairo_line_to (cr, x+2*i, y);
+ cairo_line_to (cr, x+i, y+i);
+ cairo_close_path (cr);
+
+ /* bottom left triangle */
+ cairo_move_to (cr, x+i, y+i);
+ cairo_line_to (cr, x, y+2*i);
+ cairo_line_to (cr, x+i, y+2*i);
+ cairo_close_path (cr);
+
+ /* bottom right triangle */
+ cairo_move_to (cr, x+i, y+i);
+ cairo_line_to (cr, x+i, y+2*i);
+ cairo_line_to (cr, x+2*i, y+2*i);
+ cairo_close_path (cr);
+ }
+ }
+ cairo_fill (cr);
+ cairo_restore (cr);
+
+ cairo_translate (cr, WIDTH, 0);
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (half_coverage_rectangles,
+ "Check the fidelity of the rasterisation.",
+ NULL, /* keywords */
+ "target=raster slow", /* requirements */
+ WIDTH * SIZE, HEIGHT,
+ NULL, rectangles)
+
+CAIRO_TEST (half_coverage_triangles,
+ "Check the fidelity of the rasterisation.",
+ NULL, /* keywords */
+ "target=raster slow", /* requirements */
+ WIDTH * SIZE, HEIGHT,
+ NULL, triangles)