mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
synced 2025-12-20 17:30:07 +01:00
654b4a8efe
Commit 4e3ef57bc8 added
coverage-intersecting-triangles with an incorrect reference and
generator. The test checks the rasterization of two overlapping
triangles in the following position:
. .
|\ /|
| X |
|/ \|
.---.
Since the triangles have both vertical and horizontal sides of size
x/WIDTH, the expected coverage is 3/4 (75%) of (x/WIDTH)^2. The
original code, instead, was checking for a coverage of 0.75*x/WIDTH,
as if one of the sides was always 1 unit long.
The image and xlib backends still suffer from some jitter, caused by
the approximation of the actual coverage by means of sampling. For
this reason their references are still considered XFAIL, even though
their result now looks mostly consistent with the expected reference.
506 lines
13 KiB
C
506 lines
13 KiB
C
/*
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* Copyright 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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/* Test the fidelity of the rasterisation, because Cairo is my favourite
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* driver test suite.
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*/
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#define GENERATE_REFERENCE 0
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#define WIDTH 256
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#define HEIGHT 40
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#include "../src/cairo-fixed-type-private.h"
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#define PRECISION (1 << CAIRO_FIXED_FRAC_BITS)
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/* XXX beware multithreading! */
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static uint32_t state;
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static uint32_t
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hars_petruska_f54_1_random (void)
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{
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#define rol(x,k) ((x << k) | (x >> (32-k)))
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return state = (state ^ rol (state, 5) ^ rol (state, 24)) + 0x37798849;
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#undef rol
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}
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static double
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random_offset (int range, int precise)
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{
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double x = hars_petruska_f54_1_random() / (double) UINT32_MAX * range / WIDTH;
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if (precise)
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x = floor (x * PRECISION) / PRECISION;
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return x;
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}
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static cairo_test_status_t
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rectangles (cairo_t *cr, int width, int height)
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{
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int x, y, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * x * 1.0 / (WIDTH * WIDTH));
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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for (y = 0; y < HEIGHT; y++) {
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double dx = random_offset (WIDTH - x, TRUE);
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double dy = random_offset (WIDTH - x, TRUE);
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cairo_rectangle (cr, x + dx, y + dy, x / (double) WIDTH, x / (double) WIDTH);
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}
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}
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cairo_fill (cr);
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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rhombus (cairo_t *cr, int width, int height)
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{
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int x, y;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (y = 0; y < WIDTH; y++) {
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1,
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x * y / (2. * WIDTH * WIDTH));
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cairo_rectangle (cr, 2*x, 2*y, 2, 2);
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cairo_fill (cr);
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}
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
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cairo_set_source_rgb (cr, 1, 1, 1);
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for (y = 0; y < WIDTH; y++) {
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double yf = y / (double) WIDTH;
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for (x = 0; x < WIDTH; x++) {
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double xf = x / (double) WIDTH;
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cairo_move_to (cr,
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2*x + 1 - xf,
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2*y + 1);
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cairo_line_to (cr,
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2*x + 1,
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2*y + 1 - yf);
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cairo_line_to (cr,
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2*x + 1 + xf,
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2*y + 1);
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cairo_line_to (cr,
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2*x + 1,
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2*y + 1 + yf);
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cairo_close_path (cr);
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}
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}
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cairo_fill (cr);
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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intersecting_quads (cairo_t *cr, int width, int height)
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{
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int x, y, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.5 / (WIDTH * WIDTH));
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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double step = x / (double) WIDTH;
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for (y = 0; y < HEIGHT; y++) {
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double dx = random_offset (WIDTH - x, TRUE);
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double dy = random_offset (WIDTH - x, TRUE);
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cairo_move_to (cr, x + dx, y + dy);
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cairo_rel_line_to (cr, step, step);
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cairo_rel_line_to (cr, 0, -step);
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cairo_rel_line_to (cr, -step, step);
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cairo_close_path (cr);
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}
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}
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cairo_fill (cr);
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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intersecting_triangles (cairo_t *cr, int width, int height)
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{
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int x, y, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.75 / (WIDTH * WIDTH));
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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double step = x / (double) WIDTH;
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for (y = 0; y < HEIGHT; y++) {
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double dx = random_offset (WIDTH - x, TRUE);
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double dy = random_offset (WIDTH - x, TRUE);
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/* left */
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cairo_move_to (cr, x + dx, y + dy);
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cairo_rel_line_to (cr, 0, step);
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cairo_rel_line_to (cr, step, 0);
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cairo_close_path (cr);
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/* right, mirrored */
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cairo_move_to (cr, x + dx + step, y + dy + step);
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cairo_rel_line_to (cr, 0, -step);
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cairo_rel_line_to (cr, -step, step);
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cairo_close_path (cr);
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}
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}
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cairo_fill (cr);
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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triangles (cairo_t *cr, int width, int height)
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{
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int x, y, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.5 / (WIDTH * WIDTH));
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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for (y = 0; y < HEIGHT; y++) {
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double dx = random_offset (WIDTH - x, TRUE);
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double dy = random_offset (WIDTH - x, TRUE);
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cairo_move_to (cr, x + dx, y + dy);
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cairo_rel_line_to (cr, x / (double) WIDTH, 0);
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cairo_rel_line_to (cr, 0, x / (double) WIDTH);
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cairo_close_path (cr);
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}
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}
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cairo_fill (cr);
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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abutting (cairo_t *cr, int width, int height)
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{
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int x, y;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.75);
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#if GENERATE_REFERENCE
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cairo_paint (cr);
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (y = 0; y < 16; y++) {
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for (x = 0; x < 16; x++) {
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double theta = (y * 16 + x) * M_PI / 512;
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double cx = 16 * cos (theta) + x * 16;
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double cy = 16 * sin (theta) + y * 16;
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cairo_move_to (cr, x * 16, y * 16);
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cairo_line_to (cr, cx, cy);
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cairo_line_to (cr, (x + 1) * 16, y * 16);
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cairo_fill (cr);
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cairo_move_to (cr, (x + 1) * 16, y * 16);
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cairo_line_to (cr, cx, cy);
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cairo_line_to (cr, (x + 1) * 16, (y + 1) * 16);
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cairo_fill (cr);
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cairo_move_to (cr, (x + 1) * 16, (y + 1) * 16);
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cairo_line_to (cr, cx, cy);
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cairo_line_to (cr, x * 16, (y + 1) * 16);
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cairo_fill (cr);
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cairo_move_to (cr, x * 16, (y + 1) * 16);
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cairo_line_to (cr, cx, cy);
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cairo_line_to (cr, x * 16, y * 16);
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cairo_fill (cr);
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}
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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column_triangles (cairo_t *cr, int width, int height)
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{
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int x, y, i, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * 0.5 / WIDTH);
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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double step = x / (double) (2 * WIDTH);
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for (y = 0; y < HEIGHT; y++) {
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for (i = 0; i < PRECISION; i++) {
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double dy = random_offset (WIDTH - x, FALSE);
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/*
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* We want to test some sharing of edges to further
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* stress the rasterisers, so instead of using one
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* tall triangle, it is split into two, with vertical
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* edges on either side that may co-align with their
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* neighbours:
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*
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* s --- . ---
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* t | |\ |
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* e | | \ |
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* p --- .... | 2 * step = x / WIDTH
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* \ | |
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* \| |
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* . ---
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* |---|
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* 1 / PRECISION
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*
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* Each column contains two triangles of width one quantum and
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* total height of (x / WIDTH), thus the total area covered by all
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* columns in each pixel is .5 * (x / WIDTH).
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*/
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cairo_move_to (cr, x + i / (double) PRECISION, y + dy);
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cairo_rel_line_to (cr, 0, step);
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cairo_rel_line_to (cr, 1 / (double) PRECISION, step);
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cairo_rel_line_to (cr, 0, -step);
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cairo_close_path (cr);
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}
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cairo_fill (cr); /* do these per-pixel due to the extra volume of edges */
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}
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}
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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row_triangles (cairo_t *cr, int width, int height)
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{
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int x, y, i, channel;
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state = 0x12345678;
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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#if GENERATE_REFERENCE
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for (x = 0; x < WIDTH; x++) {
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cairo_set_source_rgba (cr, 1, 1, 1, x * 0.5 / WIDTH);
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cairo_rectangle (cr, x, 0, 1, HEIGHT);
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cairo_fill (cr);
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}
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#else
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cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
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for (channel = 0; channel < 3; channel++) {
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switch (channel) {
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default:
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case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
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case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
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case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
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}
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for (x = 0; x < WIDTH; x++) {
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double step = x / (double) (2 * WIDTH);
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for (y = 0; y < HEIGHT; y++) {
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for (i = 0; i < PRECISION; i++) {
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double dx = random_offset (WIDTH - x, FALSE);
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/* See column_triangles() for a transposed description
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* of this geometry.
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*/
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cairo_move_to (cr, x + dx, y + i / (double) PRECISION);
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cairo_rel_line_to (cr, step, 0);
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cairo_rel_line_to (cr, step, 1 / (double) PRECISION);
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cairo_rel_line_to (cr, -step, 0);
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cairo_close_path (cr);
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}
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cairo_fill (cr); /* do these per-pixel due to the extra volume of edges */
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}
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}
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}
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#endif
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (coverage_rectangles,
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"Check the fidelity of the rasterisation.",
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NULL, /* keywords */
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"target=raster", /* requirements */
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WIDTH, HEIGHT,
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NULL, rectangles)
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CAIRO_TEST (coverage_rhombus,
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"Check the fidelity of the rasterisation.",
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NULL, /* keywords */
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"target=raster", /* requirements */
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2*WIDTH, 2*WIDTH,
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NULL, rhombus)
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CAIRO_TEST (coverage_intersecting_quads,
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"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
WIDTH, HEIGHT,
|
|
NULL, intersecting_quads)
|
|
|
|
CAIRO_TEST (coverage_intersecting_triangles,
|
|
"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
WIDTH, HEIGHT,
|
|
NULL, intersecting_triangles)
|
|
CAIRO_TEST (coverage_row_triangles,
|
|
"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
WIDTH, HEIGHT,
|
|
NULL, row_triangles)
|
|
CAIRO_TEST (coverage_column_triangles,
|
|
"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
WIDTH, HEIGHT,
|
|
NULL, column_triangles)
|
|
CAIRO_TEST (coverage_triangles,
|
|
"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
WIDTH, HEIGHT,
|
|
NULL, triangles)
|
|
CAIRO_TEST (coverage_abutting,
|
|
"Check the fidelity of the rasterisation.",
|
|
NULL, /* keywords */
|
|
"target=raster", /* requirements */
|
|
16*16, 16*16,
|
|
NULL, abutting)
|