| /* |
| * 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 < sizeof (transform) / sizeof (transform[0]); 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) |