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test: More minute geometry exercised by partial-coverage.

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Moving beyond the capabilities of cairo...
This commit is contained in:
Chris Wilson 2010-06-12 13:34:27 +01:00
parent 4e3ef57bc8
commit 97288b0859
4 changed files with 133 additions and 0 deletions
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2
test/Makefile.am
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@ -891,6 +891,8 @@ REFERENCE_IMAGES = \
paint.ref.png \
partial-coverage-half-reference.ref.png \
partial-coverage-half-triangles.ref.png \
partial-coverage-intersecting-quads.ref.png \
partial-coverage-intersecting-triangles.ref.png \
partial-coverage-overlap-half-triangles.ref.png \
partial-coverage-overlap-half-triangles-eo.ref.png \
partial-coverage-overlap-three-quarter-triangles.ref.png \

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test/partial-coverage-intersecting-quads.ref.png Normal file
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131
test/partial-coverage.c
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@ -186,6 +186,54 @@ rectangles (cairo_t *cr, int width, int height)
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
intersecting_quads (cairo_t *cr, int width, int height)
{
uint8_t *occupancy;
int i, j, channel;
state = 0x12345678;
occupancy = xmalloc (SAMPLE*SAMPLE);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
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 (i = 0; i < SIZE*SIZE; i++) {
int xs, ys;
compute_occupancy (occupancy, SAMPLE*SAMPLE * i / (SIZE * SIZE), SAMPLE*SAMPLE);
xs = i % SIZE * SAMPLE;
ys = i / SIZE * SAMPLE;
for (j = 0; j < SAMPLE*SAMPLE; j++) {
if (occupancy[j]) {
cairo_move_to (cr,
(j % SAMPLE + xs) / (double) SAMPLE,
(j / SAMPLE + ys) / (double) SAMPLE);
cairo_rel_line_to (cr, 1 / (double) SAMPLE, 1 / (double) SAMPLE);
cairo_rel_line_to (cr, 0, -1 / (double) SAMPLE);
cairo_rel_line_to (cr, -1 / (double) SAMPLE, 1 / (double) SAMPLE);
cairo_close_path (cr);
}
}
cairo_fill (cr);
}
}
free (occupancy);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
half_triangles (cairo_t *cr, int width, int height)
{
@ -491,6 +539,76 @@ triangles (cairo_t *cr, int width, int height)
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
intersecting_triangles (cairo_t *cr, int width, int height)
{
uint8_t *occupancy;
int i, j, channel;
state = 0x12345678;
occupancy = xmalloc (SAMPLE*SAMPLE);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_paint (cr);
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 (i = 0; i < SIZE*SIZE; i++) {
int xs, ys;
compute_occupancy (occupancy, SAMPLE*SAMPLE * i / (SIZE * SIZE), SAMPLE*SAMPLE);
xs = i % SIZE * SAMPLE;
ys = i / SIZE * SAMPLE;
for (j = 0; j < SAMPLE*SAMPLE; j++) {
if (occupancy[j]) {
/* Add 2 overlapping tiles in a single cell, each composed
* of two non-overlapping triangles.
* .--. .--.
* | /| |\ |
* |/ | + | \|
* .--. .--.
*/
int x = j % SAMPLE + xs;
int y = j / SAMPLE + ys;
/* first pair of triangles, diagonal bottom-left to top-right */
cairo_move_to (cr, (x) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_line_to (cr, (x) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_close_path (cr);
cairo_move_to (cr, (x) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_close_path (cr);
/* second pair of triangles, diagonal top-left to bottom-right */
cairo_move_to (cr, (x) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_close_path (cr);
cairo_move_to (cr, (x) / (double) SAMPLE, (y) / (double) SAMPLE);
cairo_line_to (cr, (x+1) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_line_to (cr, (x) / (double) SAMPLE, (y+1) / (double) SAMPLE);
cairo_close_path (cr);
}
}
cairo_fill (cr);
}
}
free (occupancy);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (partial_coverage_rectangles,
"Check the fidelity of the rasterisation.",
"coverage raster", /* keywords */
@ -498,6 +616,19 @@ CAIRO_TEST (partial_coverage_rectangles,
SIZE, SIZE,
NULL, rectangles)
CAIRO_TEST (partial_coverage_intersecting_quads,
"Check the fidelity of the rasterisation.",
"coverage raster", /* keywords */
"target=raster", /* requirements */
SIZE, SIZE,
NULL, intersecting_quads)
CAIRO_TEST (partial_coverage_intersecting_triangles,
"Check the fidelity of the rasterisation.",
"coverage raster", /* keywords */
"target=raster", /* requirements */
SIZE, SIZE,
NULL, intersecting_triangles)
CAIRO_TEST (partial_coverage_triangles,
"Check the fidelity of the rasterisation.",
"coverage raster", /* keywords */