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/*
* Copyright © 2008 Chris Wilson
*
* 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"
/*
* We wish to check the optimization away of non-fractional translations
* for NEAREST surface patterns under a few transformations.
*/
static const char png_filename[] = "romedalen.png";
/* A single, black pixel */
static const uint32_t black_pixel = 0xff000000;
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
unsigned int i, j, k;
cairo_surface_t *surface;
cairo_pattern_t *pattern;
const cairo_matrix_t transform[] = {
{ 1, 0, 0, 1, 0, 0 },
{ -1, 0, 0, 1, 8, 0 },
{ 1, 0, 0, -1, 0, 8 },
{ -1, 0, 0, -1, 8, 8 },
};
const cairo_matrix_t ctx_transform[] = {
{ 1, 0, 0, 1, 0, 0 },
{ -1, 0, 0, 1, 14, 0 },
{ 1, 0, 0, -1, 0, 14 },
{ -1, 0, 0, -1, 14, 14 },
};
const double colour[][3] = {
{0, 0, 0},
{1, 0, 0},
{0, 1, 0},
{0, 0, 1},
};
cairo_matrix_t m;
surface = cairo_image_surface_create_for_data ((uint8_t *) &black_pixel,
CAIRO_FORMAT_ARGB32,
1, 1, 4);
pattern = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy (surface);
cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
surface = cairo_test_create_surface_from_png (ctx, png_filename);
/* Fill background white */
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
for (k = 0; k < ARRAY_LENGTH (transform); k++) {
/* draw a "large" section from an image */
cairo_save (cr); {
cairo_set_matrix(cr, &ctx_transform[k]);
cairo_rectangle (cr, 0, 0, 7, 7);
cairo_clip (cr);
cairo_set_source_surface (cr, surface,
-cairo_image_surface_get_width (surface)/2.,
-cairo_image_surface_get_height (surface)/2.);
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
cairo_paint (cr);
} cairo_restore (cr);
cairo_set_source_rgb (cr, colour[k][0], colour[k][1], colour[k][2]);
for (j = 4; j <= 6; j++) {
for (i = 4; i <= 6; i++) {
cairo_matrix_init_translate (&m,
-(2*(i-4) + .1*i),
-(2*(j-4) + .1*j));
cairo_matrix_multiply (&m, &m, &transform[k]);
cairo_pattern_set_matrix (pattern, &m);
cairo_mask (cr, pattern);
}
}
}
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (filter_nearest_transformed,
"Test sample position when drawing transformed images with FILTER_NEAREST",
"filter, nearest", /* keywords */
NULL,
14, 14,
NULL, draw)