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/*
* Copyright © 2021 Matthias Clasen
* Copyright © 2021 Uli Schlachter
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Authors:
* Matthias Clasen
* Uli Schlachter
*/
// Test case for https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests/118
// A recording surface with a non-zero origin gets cut off when passed to
// cairo_surface_write_to_png().
#include "cairo-test.h"
#include <assert.h>
struct buffer {
char *data;
size_t length;
};
static cairo_surface_t *
prepare_recording (void)
{
cairo_surface_t *surface;
cairo_rectangle_t rect;
cairo_t *cr;
rect.x = -1;
rect.y = -2;
rect.width = 3;
rect.height = 4;
surface = cairo_recording_surface_create (CAIRO_CONTENT_COLOR_ALPHA, &rect);
cr = cairo_create (surface);
cairo_set_line_width (cr, 1);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_rectangle (cr, 0.5, -0.5, 1., 1.);
cairo_stroke (cr);
cairo_destroy (cr);
return surface;
}
static cairo_status_t
write_callback (void *closure, const unsigned char *data, unsigned int length)
{
struct buffer *buffer = closure;
buffer->data = realloc (buffer->data, buffer->length + length);
memcpy (&buffer->data[buffer->length], data, length);
buffer->length += length;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
read_callback (void *closure, unsigned char *data, unsigned int length)
{
struct buffer *buffer = closure;
assert (buffer->length >= length);
memcpy (data, buffer->data, length);
buffer->data += length;
buffer->length -= length;
return CAIRO_STATUS_SUCCESS;
}
static cairo_surface_t *
png_round_trip (cairo_surface_t *input_surface)
{
cairo_surface_t *output_surface;
struct buffer buffer;
void *to_free;
// Turn the surface into a PNG
buffer.data = NULL;
buffer.length = 0;
cairo_surface_write_to_png_stream (input_surface, write_callback, &buffer);
to_free = buffer.data;
// Load the PNG again
output_surface = cairo_image_surface_create_from_png_stream (read_callback, &buffer);
free (to_free);
return output_surface;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_surface_t *recording, *surface;
// Draw a black background so that the output does not vary with alpha
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
recording = prepare_recording ();
surface = png_round_trip (recording);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_surface_destroy (recording);
cairo_surface_destroy (surface);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (record_write_png,
"Test writing to png with non-zero origin",
"record, transform", /* keywords */
NULL, /* requirements */
4, 4,
NULL, draw)
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