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mesh-pattern tests a mesh pattern with non-opaque two overlapping patches. mesh-pattern-accuracy tests the accuracy of the color computed in each point of a patch. It can point out defects in rasterizers which rely on mesh subdivision only use the mesh shape instead of both shape and color to decide when the tensor-product patches can be approximated with Gouraud-shaded triangles. mesh-pattern-conical is an example of how a conical gradient can be approximated with a mesh pattern. mesh-pattern-control-points tests a mesh pattern with control points in non-default position to verify that their position affects the color as expected. mesh-pattern-fold tests a mesh pattern with a patch which folds along both sides. mesh-pattern-overlap tests a mesh pattern with a patch which folds along just one side. mesh-pattern-transformed tests a mesh pattern with non-identity transform matrix.
99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/*
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* Copyright © 2009 Adrian Johnson
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*
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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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*
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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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*
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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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*
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* Author: Adrian Johnson <ajohnson@redneon.com>
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*/
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#include "cairo-test.h"
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#include <float.h>
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#define SIZE 256
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/* This test is designed to test the accuracy of the rendering of mesh
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* patterns.
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*
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* Color accuracy is tested by a square patch covering the whole
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* surface with black and white corners.
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*
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* Extents accuracy is checked by a small red square patch at the
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* center of the surface which should measure 2x2 pixels.
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*/
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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cairo_pattern_t *pattern;
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double offset;
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cairo_test_paint_checkered (cr);
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pattern = cairo_pattern_create_mesh ();
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cairo_pattern_mesh_begin_patch (pattern);
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cairo_pattern_mesh_move_to (pattern, 0, 0);
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cairo_pattern_mesh_line_to (pattern, 1, 0);
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cairo_pattern_mesh_line_to (pattern, 1, 1);
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cairo_pattern_mesh_line_to (pattern, 0, 1);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 0, 0, 0);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 1, 1, 1);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 0, 0, 0);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 1, 1);
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cairo_pattern_mesh_end_patch (pattern);
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cairo_pattern_mesh_begin_patch (pattern);
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/* A small 1x1 red patch, that should be rendered as a 2x2 red
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* square in the center of the image */
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offset = 0.5 / SIZE;
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cairo_pattern_mesh_move_to (pattern, 0.5 + offset, 0.5 + offset);
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cairo_pattern_mesh_line_to (pattern, 0.5 + offset, 0.5 - offset);
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cairo_pattern_mesh_line_to (pattern, 0.5 - offset, 0.5 - offset);
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cairo_pattern_mesh_line_to (pattern, 0.5 - offset, 0.5 + offset);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 1, 0, 0);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 1, 0, 0);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 1, 0, 0);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 0, 0);
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cairo_pattern_mesh_end_patch (pattern);
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cairo_scale (cr, SIZE, SIZE);
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cairo_set_source (cr, pattern);
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cairo_paint (cr);
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cairo_pattern_destroy (pattern);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (mesh_pattern_accuracy,
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"Paint mesh pattern",
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"mesh,pattern", /* keywords */
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NULL, /* requirements */
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SIZE, SIZE,
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NULL, draw)
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