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+/*
+ * Copyright 2014 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 GENERATE_REFERENCE 0
+
+#include "../src/cairo-fixed-type-private.h"
+
+#if GENERATE_REFERENCE
+#include <assert.h>
+struct coverage {
+ int width, height;
+ struct {
+ int uncovered_area;
+ int covered_height;
+ } cells[0];
+};
+
+static int pfloor (int v)
+{
+ return v >> CAIRO_FIXED_FRAC_BITS;
+}
+
+static int pfrac (int v)
+{
+ return v & ((1 << CAIRO_FIXED_FRAC_BITS) - 1);
+}
+
+static void add_edge (struct coverage *coverage,
+ int x1, int y1, int x2, int y2,
+ int sign)
+{
+ int dx, dy;
+ int dxdy_quo, dxdy_rem;
+ int xq, xr;
+ int y, t;
+
+ if (y2 < y1) {
+ t = y1;
+ y1 = y2;
+ y2 = t;
+
+ t = x1;
+ x1 = x2;
+ x2 = t;
+
+ sign = -sign;
+ }
+
+ dx = x2 - x1;
+ dy = y2 - y1;
+ if (dy == 0)
+ return;
+
+ dy *= 2;
+
+ dxdy_quo = 2*dx / dy;
+ dxdy_rem = 2*dx % dy;
+
+ xq = x1 + dxdy_quo / 2;
+ xr = dxdy_rem / 2;
+ if (xr < 0) {
+ xq--;
+ xr += dy;
+ }
+
+ for (y = MAX(0, y1); y < MIN(y2, 256*coverage->height); y++) {
+ int x = xq + (xr >= dy/2);
+
+ if (x < 256*coverage->width) {
+ int i = pfloor (y) * coverage->width;
+ if (x > 0) {
+ i += pfloor (x);
+ coverage->cells[i].uncovered_area += sign * pfrac(x);
+ }
+ coverage->cells[i].covered_height += sign;
+ }
+
+ xq += dxdy_quo;
+ xr += dxdy_rem;
+ if (xr < 0) {
+ xq--;
+ xr += dy;
+ } else if (xr >= dy) {
+ xq++;
+ xr -= dy;
+ }
+ }
+}
+
+static struct coverage *
+coverage_create (int width, int height)
+{
+ int size;
+ struct coverage *c;
+
+ size = sizeof (struct coverage);
+ size += width * height * sizeof (int) * 2;
+
+ c = malloc (size);
+ if (c == NULL)
+ return c;
+
+ memset(c, 0, size);
+ c->width = width;
+ c->height = height;
+
+ return c;
+}
+
+static cairo_surface_t *
+coverage_to_alpha (struct coverage *c)
+{
+ cairo_surface_t *image;
+ uint8_t *data;
+ int x, y, stride;
+
+ image = cairo_image_surface_create (CAIRO_FORMAT_A8, c->width, c->height);
+
+ data = cairo_image_surface_get_data (image);
+ stride = cairo_image_surface_get_stride (image);
+
+ cairo_surface_flush (image);
+ for (y = 0; y < c->height; y++) {
+ uint8_t *row = data + y *stride;
+ int cover = 0;
+ for (x = 0; x < c->width; x++) {
+ int v = y*c->width + x;
+
+ cover += c->cells[v].covered_height * 256;
+ v = cover - c->cells[v].uncovered_area;
+
+ v /= 256;
+ if (v < 0)
+ v = -v;
+ row[x] = v - (v >> 8);
+ }
+ }
+ cairo_surface_mark_dirty (image);
+
+ free (c);
+ return image;
+}
+#endif
+
+static cairo_test_status_t
+edge (cairo_t *cr, int width, int height)
+{
+ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ cairo_paint (cr);
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
+
+#if GENERATE_REFERENCE
+ {
+ struct coverage *c;
+ cairo_surface_t *mask;
+
+ cairo_set_source_rgb (cr, 1, 0, 0);
+
+ c = coverage_create (width, height);
+ add_edge (c, 128*256, 129*256, 129*256, 1*256, 1);
+ add_edge (c, 128*256, 129*256, 128*256, 131*256, -1);
+ add_edge (c, 128*256, 131*256, 129*256, 259*256, -1);
+ add_edge (c, 130*256, 129*256, 129*256, 1*256, -1);
+ add_edge (c, 130*256, 129*256, 130*256, 131*256, 1);
+ add_edge (c, 130*256, 131*256, 129*256, 259*256, 1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, 128*256/2, 129*256/2, 129*256/2, 1*256/2, 1);
+ add_edge (c, 128*256/2, 129*256/2, 128*256/2, 131*256/2, -1);
+ add_edge (c, 128*256/2, 131*256/2, 129*256/2, 259*256/2, -1);
+ add_edge (c, 130*256/2, 129*256/2, 129*256/2, 1*256/2, -1);
+ add_edge (c, 130*256/2, 129*256/2, 130*256/2, 131*256/2, 1);
+ add_edge (c, 130*256/2, 131*256/2, 129*256/2, 259*256/2, 1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, (192-2)*256, 129*256, 192*256, 1*256, 1);
+ add_edge (c, (192-2)*256, 129*256, (192-2)*256, 131*256, -1);
+ add_edge (c, (192-2)*256, 131*256, 192*256, 259*256, -1);
+ add_edge (c, (192+2)*256, 129*256, 192*256, 1*256, -1);
+ add_edge (c, (192+2)*256, 129*256, (192+2)*256, 131*256, 1);
+ add_edge (c, (192+2)*256, 131*256, 192*256, 259*256, 1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, (256-4)*256, 129*256, 256*256, 1*256, 1);
+ add_edge (c, (256-4)*256, 129*256, (256-4)*256, 131*256, -1);
+ add_edge (c, (256-4)*256, 131*256, 256*256, 259*256, -1);
+ add_edge (c, (256+4)*256, 129*256, 256*256, 1*256, -1);
+ add_edge (c, (256+4)*256, 129*256, (256+4)*256, 131*256, 1);
+ add_edge (c, (256+4)*256, 131*256, 256*256, 259*256, 1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ cairo_set_source_rgb (cr, 0, 1, 0);
+
+ c = coverage_create (width, height);
+ add_edge (c, 1*256, 129*256, 129*256, 128*256, 1);
+ add_edge (c, 131*256, 128*256, 259*256, 129*256, 1);
+ add_edge (c, 1*256, 129*256, 129*256, 130*256, -1);
+ add_edge (c, 131*256, 130*256, 259*256, 129*256, -1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, 1*256/2, 129*256/2, 129*256/2, 128*256/2, 1);
+ add_edge (c, 131*256/2, 128*256/2, 259*256/2, 129*256/2, 1);
+ add_edge (c, 1*256/2, 129*256/2, 129*256/2, 130*256/2, -1);
+ add_edge (c, 131*256/2, 130*256/2, 259*256/2, 129*256/2, -1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, 1*256, (192-0)*256, 129*256, (192-2)*256, 1);
+ add_edge (c, 131*256, (192-2)*256, 259*256, (192-0)*256, 1);
+ add_edge (c, 1*256, (192+0)*256, 129*256, (192+2)*256, -1);
+ add_edge (c, 131*256, (192+2)*256, 259*256, (192+0)*256, -1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+
+ c = coverage_create (width, height);
+ add_edge (c, 1*256, (256-0)*256, 129*256, (256-4)*256, 1);
+ add_edge (c, 131*256, (256-4)*256, 259*256, (256-0)*256, 1);
+ add_edge (c, 1*256, (256+0)*256, 129*256, (256+4)*256, -1);
+ add_edge (c, 131*256, (256+4)*256, 259*256, (256+0)*256, -1);
+ mask = coverage_to_alpha (c);
+ cairo_mask_surface (cr, mask, 0, 0);
+ cairo_surface_destroy (mask);
+ }
+#else
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_move_to (cr, 129, 1);
+ cairo_line_to (cr, 128, 129);
+ cairo_line_to (cr, 128, 131);
+ cairo_line_to (cr, 129, 259);
+ cairo_line_to (cr, 130, 131);
+ cairo_line_to (cr, 130, 129);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 129/2., 1/2.);
+ cairo_line_to (cr, 128/2., 129/2.);
+ cairo_line_to (cr, 128/2., 131/2.);
+ cairo_line_to (cr, 129/2., 259/2.);
+ cairo_line_to (cr, 130/2., 131/2.);
+ cairo_line_to (cr, 130/2., 129/2.);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 192, 1);
+ cairo_line_to (cr, 192-2, 129);
+ cairo_line_to (cr, 192-2, 131);
+ cairo_line_to (cr, 192, 259);
+ cairo_line_to (cr, 192+2, 131);
+ cairo_line_to (cr, 192+2, 129);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 256, 1);
+ cairo_line_to (cr, 256-4, 129);
+ cairo_line_to (cr, 256-4, 131);
+ cairo_line_to (cr, 256, 259);
+ cairo_line_to (cr, 256+4, 131);
+ cairo_line_to (cr, 256+4, 129);
+ cairo_fill (cr);
+
+ cairo_set_source_rgb (cr, 0, 1, 0);
+ cairo_move_to (cr, 1, 129);
+ cairo_line_to (cr, 129, 128);
+ cairo_line_to (cr, 131, 128);
+ cairo_line_to (cr, 259, 129);
+ cairo_line_to (cr, 131, 130);
+ cairo_line_to (cr, 129, 130);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 1/2., 129/2.);
+ cairo_line_to (cr, 129/2., 128/2.);
+ cairo_line_to (cr, 131/2., 128/2.);
+ cairo_line_to (cr, 259/2., 129/2.);
+ cairo_line_to (cr, 131/2., 130/2.);
+ cairo_line_to (cr, 129/2., 130/2.);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 1, 192);
+ cairo_line_to (cr, 129, 192-2);
+ cairo_line_to (cr, 131, 192-2);
+ cairo_line_to (cr, 259, 192);
+ cairo_line_to (cr, 131, 192+2);
+ cairo_line_to (cr, 129, 192+2);
+ cairo_fill (cr);
+
+ cairo_move_to (cr, 1, 256);
+ cairo_line_to (cr, 129, 256-4);
+ cairo_line_to (cr, 131, 256-4);
+ cairo_line_to (cr, 259, 256);
+ cairo_line_to (cr, 131, 256+4);
+ cairo_line_to (cr, 129, 256+4);
+ cairo_fill (cr);
+#endif
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (simple_edge,
+ "Check the fidelity of the rasterisation.",
+ NULL, /* keywords */
+ "target=raster", /* requirements */
+ 260, 260,
+ NULL, edge)
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-26 22:34:41 +0000