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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 GENERATE_REFERENCE 0
#define WIDTH 256
#define HEIGHT 40
#include "../src/cairo-fixed-type-private.h"
#define PRECISION (1 << CAIRO_FIXED_FRAC_BITS)
/* XXX beware multithreading! */
static uint32_t state;
static uint32_t
hars_petruska_f54_1_random (void)
{
#define rol(x,k) ((x << k) | (x >> (32-k)))
return state = (state ^ rol (state, 5) ^ rol (state, 24)) + 0x37798849;
#undef rol
}
static double
random_offset (int range, int precise)
{
double x = hars_petruska_f54_1_random() / (double) UINT32_MAX * range / WIDTH;
if (precise)
x = floor (x * PRECISION) / PRECISION;
return x;
}
static cairo_test_status_t
rectangles (cairo_t *cr, int width, int height)
{
int x, y, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * x * 1.0 / (WIDTH * WIDTH));
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
for (y = 0; y < HEIGHT; y++) {
double dx = random_offset (WIDTH - x, TRUE);
double dy = random_offset (WIDTH - x, TRUE);
cairo_rectangle (cr, x + dx, y + dy, x / (double) WIDTH, x / (double) WIDTH);
}
}
cairo_fill (cr);
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
rhombus (cairo_t *cr, int width, int height)
{
int x, y;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (y = 0; y < WIDTH; y++) {
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1,
x * y / (2. * WIDTH * WIDTH));
cairo_rectangle (cr, 2*x, 2*y, 2, 2);
cairo_fill (cr);
}
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_set_source_rgb (cr, 1, 1, 1);
for (y = 0; y < WIDTH; y++) {
double yf = y / (double) WIDTH;
for (x = 0; x < WIDTH; x++) {
double xf = x / (double) WIDTH;
cairo_move_to (cr,
2*x + 1 - xf,
2*y + 1);
cairo_line_to (cr,
2*x + 1,
2*y + 1 - yf);
cairo_line_to (cr,
2*x + 1 + xf,
2*y + 1);
cairo_line_to (cr,
2*x + 1,
2*y + 1 + yf);
cairo_close_path (cr);
}
}
cairo_fill (cr);
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
intersecting_quads (cairo_t *cr, int width, int height)
{
int x, y, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.5 / (WIDTH * WIDTH));
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
double step = x / (double) WIDTH;
for (y = 0; y < HEIGHT; y++) {
double dx = random_offset (WIDTH - x, TRUE);
double dy = random_offset (WIDTH - x, TRUE);
cairo_move_to (cr, x + dx, y + dy);
cairo_rel_line_to (cr, step, step);
cairo_rel_line_to (cr, 0, -step);
cairo_rel_line_to (cr, -step, step);
cairo_close_path (cr);
}
}
cairo_fill (cr);
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
intersecting_triangles (cairo_t *cr, int width, int height)
{
int x, y, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.75 / (WIDTH * WIDTH));
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
double step = x / (double) WIDTH;
for (y = 0; y < HEIGHT; y++) {
double dx = random_offset (WIDTH - x, TRUE);
double dy = random_offset (WIDTH - x, TRUE);
/* left */
cairo_move_to (cr, x + dx, y + dy);
cairo_rel_line_to (cr, 0, step);
cairo_rel_line_to (cr, step, 0);
cairo_close_path (cr);
/* right, mirrored */
cairo_move_to (cr, x + dx + step, y + dy + step);
cairo_rel_line_to (cr, 0, -step);
cairo_rel_line_to (cr, -step, step);
cairo_close_path (cr);
}
}
cairo_fill (cr);
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
triangles (cairo_t *cr, int width, int height)
{
int x, y, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * x * 0.5 / (WIDTH * WIDTH));
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
for (y = 0; y < HEIGHT; y++) {
double dx = random_offset (WIDTH - x, TRUE);
double dy = random_offset (WIDTH - x, TRUE);
cairo_move_to (cr, x + dx, y + dy);
cairo_rel_line_to (cr, x / (double) WIDTH, 0);
cairo_rel_line_to (cr, 0, x / (double) WIDTH);
cairo_close_path (cr);
}
}
cairo_fill (cr);
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
abutting (cairo_t *cr, int width, int height)
{
int x, y;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.75);
#if GENERATE_REFERENCE
cairo_paint (cr);
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (y = 0; y < 16; y++) {
for (x = 0; x < 16; x++) {
double theta = (y * 16 + x) * M_PI / 512;
double cx = 16 * cos (theta) + x * 16;
double cy = 16 * sin (theta) + y * 16;
cairo_move_to (cr, x * 16, y * 16);
cairo_line_to (cr, cx, cy);
cairo_line_to (cr, (x + 1) * 16, y * 16);
cairo_fill (cr);
cairo_move_to (cr, (x + 1) * 16, y * 16);
cairo_line_to (cr, cx, cy);
cairo_line_to (cr, (x + 1) * 16, (y + 1) * 16);
cairo_fill (cr);
cairo_move_to (cr, (x + 1) * 16, (y + 1) * 16);
cairo_line_to (cr, cx, cy);
cairo_line_to (cr, x * 16, (y + 1) * 16);
cairo_fill (cr);
cairo_move_to (cr, x * 16, (y + 1) * 16);
cairo_line_to (cr, cx, cy);
cairo_line_to (cr, x * 16, y * 16);
cairo_fill (cr);
}
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
column_triangles (cairo_t *cr, int width, int height)
{
int x, y, i, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * 0.5 / WIDTH);
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
double step = x / (double) (2 * WIDTH);
for (y = 0; y < HEIGHT; y++) {
for (i = 0; i < PRECISION; i++) {
double dy = random_offset (WIDTH - x, FALSE);
/*
* We want to test some sharing of edges to further
* stress the rasterisers, so instead of using one
* tall triangle, it is split into two, with vertical
* edges on either side that may co-align with their
* neighbours:
*
* s --- . ---
* t | |\ |
* e | | \ |
* p --- .... | 2 * step = x / WIDTH
* \ | |
* \| |
* . ---
* |---|
* 1 / PRECISION
*
* Each column contains two triangles of width one quantum and
* total height of (x / WIDTH), thus the total area covered by all
* columns in each pixel is .5 * (x / WIDTH).
*/
cairo_move_to (cr, x + i / (double) PRECISION, y + dy);
cairo_rel_line_to (cr, 0, step);
cairo_rel_line_to (cr, 1 / (double) PRECISION, step);
cairo_rel_line_to (cr, 0, -step);
cairo_close_path (cr);
}
cairo_fill (cr); /* do these per-pixel due to the extra volume of edges */
}
}
}
#endif
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
row_triangles (cairo_t *cr, int width, int height)
{
int x, y, i, channel;
state = 0x12345678;
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
#if GENERATE_REFERENCE
for (x = 0; x < WIDTH; x++) {
cairo_set_source_rgba (cr, 1, 1, 1, x * 0.5 / WIDTH);
cairo_rectangle (cr, x, 0, 1, HEIGHT);
cairo_fill (cr);
}
#else
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
for (channel = 0; channel < 3; channel++) {
switch (channel) {
default:
case 0: cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); break;
case 1: cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); break;
case 2: cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); break;
}
for (x = 0; x < WIDTH; x++) {
double step = x / (double) (2 * WIDTH);
for (y = 0; y < HEIGHT; y++) {
for (i = 0; i < PRECISION; i++) {
double dx = random_offset (WIDTH - x, FALSE);
/* See column_triangles() for a transposed description
* of this geometry.
*/
cairo_move_to (cr, x + dx, y + i / (double) PRECISION);
cairo_rel_line_to (cr, step, 0);
cairo_rel_line_to (cr, step, 1 / (double) PRECISION);
cairo_rel_line_to (cr, -step, 0);
cairo_close_path (cr);
}
cairo_fill (cr); /* do these per-pixel due to the extra volume of edges */
}
}
}
#endif
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (coverage_rectangles,
"Check the fidelity of the rasterisation.",
NULL, /* keywords */
"target=raster", /* requirements */
WIDTH, HEIGHT,
NULL, rectangles)
CAIRO_TEST (coverage_rhombus,
"Check the fidelity of the rasterisation.",
NULL, /* keywords */
"target=raster", /* requirements */
2*WIDTH, 2*WIDTH,
NULL, rhombus)
CAIRO_TEST (coverage_intersecting_quads,
"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)