2 * Copyright 2014 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
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8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * Author: Chris Wilson <chris@chris-wilson.co.uk>
27 #include "cairo-test.h"
29 /* Test the fidelity of the rasterisation, because Cairo is my favourite
33 #define GENERATE_REFERENCE 0
35 #include "../src/cairo-fixed-type-private.h"
37 #if GENERATE_REFERENCE
47 static int pfloor (int v)
49 return v >> CAIRO_FIXED_FRAC_BITS;
52 static int pfrac (int v)
54 return v & ((1 << CAIRO_FIXED_FRAC_BITS) - 1);
57 static void add_edge (struct coverage *coverage,
58 int x1, int y1, int x2, int y2,
62 int dxdy_quo, dxdy_rem;
88 xq = x1 + dxdy_quo / 2;
95 for (y = MAX(0, y1); y < MIN(y2, 256*coverage->height); y++) {
96 int x = xq + (xr >= dy/2);
98 if (x < 256*coverage->width) {
99 int i = pfloor (y) * coverage->width;
102 coverage->cells[i].uncovered_area += sign * pfrac(x);
104 coverage->cells[i].covered_height += sign;
112 } else if (xr >= dy) {
119 static struct coverage *
120 coverage_create (int width, int height)
125 size = sizeof (struct coverage);
126 size += width * height * sizeof (int) * 2;
139 static cairo_surface_t *
140 coverage_to_alpha (struct coverage *c)
142 cairo_surface_t *image;
146 image = cairo_image_surface_create (CAIRO_FORMAT_A8, c->width, c->height);
148 data = cairo_image_surface_get_data (image);
149 stride = cairo_image_surface_get_stride (image);
151 cairo_surface_flush (image);
152 for (y = 0; y < c->height; y++) {
153 uint8_t *row = data + y *stride;
155 for (x = 0; x < c->width; x++) {
156 int v = y*c->width + x;
158 cover += c->cells[v].covered_height * 256;
159 v = cover - c->cells[v].uncovered_area;
164 row[x] = v - (v >> 8);
167 cairo_surface_mark_dirty (image);
174 static cairo_test_status_t
175 edge (cairo_t *cr, int width, int height)
177 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
180 cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
182 #if GENERATE_REFERENCE
185 cairo_surface_t *mask;
187 cairo_set_source_rgb (cr, 1, 0, 0);
189 c = coverage_create (width, height);
190 add_edge (c, 128*256, 129*256, 129*256, 1*256, 1);
191 add_edge (c, 128*256, 129*256, 128*256, 131*256, -1);
192 add_edge (c, 128*256, 131*256, 129*256, 259*256, -1);
193 add_edge (c, 130*256, 129*256, 129*256, 1*256, -1);
194 add_edge (c, 130*256, 129*256, 130*256, 131*256, 1);
195 add_edge (c, 130*256, 131*256, 129*256, 259*256, 1);
196 mask = coverage_to_alpha (c);
197 cairo_mask_surface (cr, mask, 0, 0);
198 cairo_surface_destroy (mask);
200 c = coverage_create (width, height);
201 add_edge (c, 128*256/2, 129*256/2, 129*256/2, 1*256/2, 1);
202 add_edge (c, 128*256/2, 129*256/2, 128*256/2, 131*256/2, -1);
203 add_edge (c, 128*256/2, 131*256/2, 129*256/2, 259*256/2, -1);
204 add_edge (c, 130*256/2, 129*256/2, 129*256/2, 1*256/2, -1);
205 add_edge (c, 130*256/2, 129*256/2, 130*256/2, 131*256/2, 1);
206 add_edge (c, 130*256/2, 131*256/2, 129*256/2, 259*256/2, 1);
207 mask = coverage_to_alpha (c);
208 cairo_mask_surface (cr, mask, 0, 0);
209 cairo_surface_destroy (mask);
211 c = coverage_create (width, height);
212 add_edge (c, (192-2)*256, 129*256, 192*256, 1*256, 1);
213 add_edge (c, (192-2)*256, 129*256, (192-2)*256, 131*256, -1);
214 add_edge (c, (192-2)*256, 131*256, 192*256, 259*256, -1);
215 add_edge (c, (192+2)*256, 129*256, 192*256, 1*256, -1);
216 add_edge (c, (192+2)*256, 129*256, (192+2)*256, 131*256, 1);
217 add_edge (c, (192+2)*256, 131*256, 192*256, 259*256, 1);
218 mask = coverage_to_alpha (c);
219 cairo_mask_surface (cr, mask, 0, 0);
220 cairo_surface_destroy (mask);
222 c = coverage_create (width, height);
223 add_edge (c, (256-4)*256, 129*256, 256*256, 1*256, 1);
224 add_edge (c, (256-4)*256, 129*256, (256-4)*256, 131*256, -1);
225 add_edge (c, (256-4)*256, 131*256, 256*256, 259*256, -1);
226 add_edge (c, (256+4)*256, 129*256, 256*256, 1*256, -1);
227 add_edge (c, (256+4)*256, 129*256, (256+4)*256, 131*256, 1);
228 add_edge (c, (256+4)*256, 131*256, 256*256, 259*256, 1);
229 mask = coverage_to_alpha (c);
230 cairo_mask_surface (cr, mask, 0, 0);
231 cairo_surface_destroy (mask);
233 cairo_set_source_rgb (cr, 0, 1, 0);
235 c = coverage_create (width, height);
236 add_edge (c, 1*256, 129*256, 129*256, 128*256, 1);
237 add_edge (c, 131*256, 128*256, 259*256, 129*256, 1);
238 add_edge (c, 1*256, 129*256, 129*256, 130*256, -1);
239 add_edge (c, 131*256, 130*256, 259*256, 129*256, -1);
240 mask = coverage_to_alpha (c);
241 cairo_mask_surface (cr, mask, 0, 0);
242 cairo_surface_destroy (mask);
244 c = coverage_create (width, height);
245 add_edge (c, 1*256/2, 129*256/2, 129*256/2, 128*256/2, 1);
246 add_edge (c, 131*256/2, 128*256/2, 259*256/2, 129*256/2, 1);
247 add_edge (c, 1*256/2, 129*256/2, 129*256/2, 130*256/2, -1);
248 add_edge (c, 131*256/2, 130*256/2, 259*256/2, 129*256/2, -1);
249 mask = coverage_to_alpha (c);
250 cairo_mask_surface (cr, mask, 0, 0);
251 cairo_surface_destroy (mask);
253 c = coverage_create (width, height);
254 add_edge (c, 1*256, (192-0)*256, 129*256, (192-2)*256, 1);
255 add_edge (c, 131*256, (192-2)*256, 259*256, (192-0)*256, 1);
256 add_edge (c, 1*256, (192+0)*256, 129*256, (192+2)*256, -1);
257 add_edge (c, 131*256, (192+2)*256, 259*256, (192+0)*256, -1);
258 mask = coverage_to_alpha (c);
259 cairo_mask_surface (cr, mask, 0, 0);
260 cairo_surface_destroy (mask);
262 c = coverage_create (width, height);
263 add_edge (c, 1*256, (256-0)*256, 129*256, (256-4)*256, 1);
264 add_edge (c, 131*256, (256-4)*256, 259*256, (256-0)*256, 1);
265 add_edge (c, 1*256, (256+0)*256, 129*256, (256+4)*256, -1);
266 add_edge (c, 131*256, (256+4)*256, 259*256, (256+0)*256, -1);
267 mask = coverage_to_alpha (c);
268 cairo_mask_surface (cr, mask, 0, 0);
269 cairo_surface_destroy (mask);
272 cairo_set_source_rgb (cr, 1, 0, 0);
273 cairo_move_to (cr, 129, 1);
274 cairo_line_to (cr, 128, 129);
275 cairo_line_to (cr, 128, 131);
276 cairo_line_to (cr, 129, 259);
277 cairo_line_to (cr, 130, 131);
278 cairo_line_to (cr, 130, 129);
281 cairo_move_to (cr, 129/2., 1/2.);
282 cairo_line_to (cr, 128/2., 129/2.);
283 cairo_line_to (cr, 128/2., 131/2.);
284 cairo_line_to (cr, 129/2., 259/2.);
285 cairo_line_to (cr, 130/2., 131/2.);
286 cairo_line_to (cr, 130/2., 129/2.);
289 cairo_move_to (cr, 192, 1);
290 cairo_line_to (cr, 192-2, 129);
291 cairo_line_to (cr, 192-2, 131);
292 cairo_line_to (cr, 192, 259);
293 cairo_line_to (cr, 192+2, 131);
294 cairo_line_to (cr, 192+2, 129);
297 cairo_move_to (cr, 256, 1);
298 cairo_line_to (cr, 256-4, 129);
299 cairo_line_to (cr, 256-4, 131);
300 cairo_line_to (cr, 256, 259);
301 cairo_line_to (cr, 256+4, 131);
302 cairo_line_to (cr, 256+4, 129);
305 cairo_set_source_rgb (cr, 0, 1, 0);
306 cairo_move_to (cr, 1, 129);
307 cairo_line_to (cr, 129, 128);
308 cairo_line_to (cr, 131, 128);
309 cairo_line_to (cr, 259, 129);
310 cairo_line_to (cr, 131, 130);
311 cairo_line_to (cr, 129, 130);
314 cairo_move_to (cr, 1/2., 129/2.);
315 cairo_line_to (cr, 129/2., 128/2.);
316 cairo_line_to (cr, 131/2., 128/2.);
317 cairo_line_to (cr, 259/2., 129/2.);
318 cairo_line_to (cr, 131/2., 130/2.);
319 cairo_line_to (cr, 129/2., 130/2.);
322 cairo_move_to (cr, 1, 192);
323 cairo_line_to (cr, 129, 192-2);
324 cairo_line_to (cr, 131, 192-2);
325 cairo_line_to (cr, 259, 192);
326 cairo_line_to (cr, 131, 192+2);
327 cairo_line_to (cr, 129, 192+2);
330 cairo_move_to (cr, 1, 256);
331 cairo_line_to (cr, 129, 256-4);
332 cairo_line_to (cr, 131, 256-4);
333 cairo_line_to (cr, 259, 256);
334 cairo_line_to (cr, 131, 256+4);
335 cairo_line_to (cr, 129, 256+4);
339 return CAIRO_TEST_SUCCESS;
342 CAIRO_TEST (simple_edge,
343 "Check the fidelity of the rasterisation.",
345 "target=raster", /* requirements */