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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 2024-06-01 00:33:38 +0000