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d3c4349730
The issue being that as the on-stack data is being referenced via a zero-copy snapshot outside of the functions scope as the surface is only finished and the source written long after the draw() returns. The correct procedure is that the user must call cairo_surface_finish() prior to any surface becoming inaccessible. In this case, this triggers the snapshot to preserve a copy of the data whilst it is still valid.
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/*
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* Copyright © 2005 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Carl D. Worth <cworth@cworth.org>
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*/
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#include "cairo-test.h"
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#define STAMP_WIDTH 4
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#define STAMP_HEIGHT 4
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#define PAD 1
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#define STEPS 10
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#define IMAGE_WIDTH (PAD + STEPS * (STAMP_WIDTH + PAD) + PAD)
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#define IMAGE_HEIGHT (PAD + STEPS * (STAMP_HEIGHT + PAD) + PAD)
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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_surface_t *surface;
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uint32_t data[STAMP_WIDTH * STAMP_HEIGHT] = {
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0xffffffff, 0xffffffff, 0xffff0000, 0xffff0000,
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0xffffffff, 0xffffffff, 0xffff0000, 0xffff0000,
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0xff00ff00, 0xff00ff00, 0xff0000ff, 0xff0000ff,
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0xff00ff00, 0xff00ff00, 0xff0000ff, 0xff0000ff
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};
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int i, j;
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/* fill with off-white to avoid a separate rgb24 ref image */
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cairo_save (cr);
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cairo_set_source_rgb (cr, .7, .7, .7);
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cairo_paint (cr);
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cairo_restore (cr);
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/* Draw reference lines where the jump should be. */
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cairo_move_to (cr, PAD + STEPS / 2 * (STAMP_WIDTH + PAD), 0);
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cairo_rel_line_to (cr, 0, IMAGE_HEIGHT);
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cairo_move_to (cr, 0, PAD + STEPS / 2 * (STAMP_HEIGHT + PAD));
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cairo_rel_line_to (cr, IMAGE_WIDTH, 0);
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cairo_set_line_width (cr, 2.0);
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cairo_stroke (cr);
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surface = cairo_image_surface_create_for_data ((unsigned char *) data,
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CAIRO_FORMAT_RGB24,
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STAMP_WIDTH,
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STAMP_HEIGHT,
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STAMP_WIDTH * 4);
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for (j=0; j < STEPS; j++) {
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double j_step;
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for (i=0; i < STEPS; i++) {
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double i_step;
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#define GENERATE_REFERENCE_IMAGE 0
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#if GENERATE_REFERENCE_IMAGE
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i_step = i >= STEPS / 2 ? 1 : 0;
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j_step = j >= STEPS / 2 ? 1 : 0;
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#else
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i_step = i * 1.0 / STEPS;
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j_step = j * 1.0 / STEPS;
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#endif
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cairo_save (cr);
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cairo_set_source_surface (cr, surface,
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PAD + i * (STAMP_WIDTH + PAD) + i_step,
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PAD + j * (STAMP_HEIGHT + PAD) + j_step);
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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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}
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}
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cairo_surface_finish (surface); /* data goes out of scope */
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cairo_surface_destroy (surface);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (filter_nearest_offset,
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"Test sampling offset of CAIRO_FILTER_NEAREST"
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"\nwrong sampling location for nearest-neighbor filter in libpixman and Render",
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"filter", /* keywords */
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NULL, /* requirements */
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IMAGE_WIDTH, IMAGE_HEIGHT,
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NULL, draw)
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