Grcov report - filter-nearest-transformed.c

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/*

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 * Copyright © 2008 Chris Wilson

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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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 * 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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 * 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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 * Author: Chris Wilson <chris@chris-wilson.co.uk>

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*/

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#include "cairo-test.h"

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/*

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 * We wish to check the optimization away of non-fractional translations

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 * for NEAREST surface patterns under a few transformations.

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*/

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static const char png_filename[] = "romedalen.png";

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/* A single, black pixel */

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static const uint32_t black_pixel = 0xff000000;

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    const cairo_test_context_t *ctx = cairo_test_get_context (cr);

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    unsigned int i, j, k;

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    cairo_surface_t *surface;

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    cairo_pattern_t *pattern;

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    const cairo_matrix_t transform[] = {

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	{  1, 0, 0,  1,  0, 0 },

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	{ -1, 0, 0,  1,  8, 0 },

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	{  1, 0, 0, -1,  0, 8 },

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	{ -1, 0, 0, -1,  8, 8 },

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};

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3

    const cairo_matrix_t ctx_transform[] = {

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	{  1, 0, 0,  1,   0,  0 },

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	{ -1, 0, 0,  1,  14,  0 },

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	{  1, 0, 0, -1,   0, 14 },

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	{ -1, 0, 0, -1,  14, 14 },

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};

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    const double colour[][3] = {

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	{0, 0, 0},

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	{1, 0, 0},

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	{0, 1, 0},

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	{0, 0, 1},

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};

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    cairo_matrix_t m;

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3

    surface = cairo_image_surface_create_for_data ((uint8_t *) &black_pixel,

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						   CAIRO_FORMAT_ARGB32,

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						   1, 1, 4);

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    pattern = cairo_pattern_create_for_surface (surface);

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    cairo_surface_destroy (surface);

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    cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);

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    surface = cairo_test_create_surface_from_png (ctx, png_filename);

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    /* Fill background white */

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    cairo_set_source_rgb (cr, 1, 1, 1);

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    cairo_paint (cr);

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    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);

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    for (k = 0; k < ARRAY_LENGTH (transform); k++) {

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	/* draw a "large" section from an image */

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	cairo_save (cr); {

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	    cairo_set_matrix(cr, &ctx_transform[k]);

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	    cairo_rectangle (cr, 0, 0, 7, 7);

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	    cairo_clip (cr);

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	    cairo_set_source_surface (cr, surface,

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				      -cairo_image_surface_get_width (surface)/2.,

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				      -cairo_image_surface_get_height (surface)/2.);

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	    cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);

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	    cairo_paint (cr);

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	} cairo_restore (cr);

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	cairo_set_source_rgb (cr, colour[k][0], colour[k][1], colour[k][2]);

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	for (j = 4; j <= 6; j++) {

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	    for (i = 4; i <= 6; i++) {

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		cairo_matrix_init_translate (&m,

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					     -(2*(i-4) + .1*i),

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					     -(2*(j-4) + .1*j));

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		cairo_matrix_multiply (&m, &m, &transform[k]);

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		cairo_pattern_set_matrix (pattern, &m);

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		cairo_mask (cr, pattern);

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    cairo_pattern_destroy (pattern);

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    cairo_surface_destroy (surface);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (filter_nearest_transformed,

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	    "Test sample position when drawing transformed images with FILTER_NEAREST",

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	    "filter, nearest", /* keywords */

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	    NULL,

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	    14, 14,

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	    NULL, draw)