mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* Copyright © 2021 Matthias Clasen
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* Copyright © 2021 Uli Schlachter
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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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* Authors:
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* Matthias Clasen
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* Uli Schlachter
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*/
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// Test case for https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests/118
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// A recording surface with a non-zero origin gets cut off when passed to
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// cairo_surface_write_to_png().
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#include "cairo-test.h"
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#include <assert.h>
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struct buffer {
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char *data;
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size_t length;
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};
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static cairo_surface_t *
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prepare_recording (void)
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{
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cairo_surface_t *surface;
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cairo_rectangle_t rect;
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cairo_t *cr;
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rect.x = -1;
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rect.y = -2;
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rect.width = 3;
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rect.height = 4;
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surface = cairo_recording_surface_create (CAIRO_CONTENT_COLOR_ALPHA, &rect);
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cr = cairo_create (surface);
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cairo_set_line_width (cr, 1);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_rectangle (cr, 0.5, -0.5, 1., 1.);
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cairo_stroke (cr);
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cairo_destroy (cr);
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return surface;
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}
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static cairo_status_t
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write_callback (void *closure, const unsigned char *data, unsigned int length)
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{
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struct buffer *buffer = closure;
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buffer->data = realloc (buffer->data, buffer->length + length);
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memcpy (&buffer->data[buffer->length], data, length);
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buffer->length += length;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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read_callback (void *closure, unsigned char *data, unsigned int length)
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{
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struct buffer *buffer = closure;
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assert (buffer->length >= length);
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memcpy (data, buffer->data, length);
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buffer->data += length;
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buffer->length -= length;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_surface_t *
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png_round_trip (cairo_surface_t *input_surface)
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{
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cairo_surface_t *output_surface;
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struct buffer buffer;
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void *to_free;
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// Turn the surface into a PNG
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buffer.data = NULL;
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buffer.length = 0;
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cairo_surface_write_to_png_stream (input_surface, write_callback, &buffer);
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to_free = buffer.data;
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// Load the PNG again
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output_surface = cairo_image_surface_create_from_png_stream (read_callback, &buffer);
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free (to_free);
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return output_surface;
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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_surface_t *recording, *surface;
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// Draw a black background so that the output does not vary with alpha
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_paint (cr);
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recording = prepare_recording ();
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surface = png_round_trip (recording);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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cairo_surface_destroy (recording);
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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 (record_write_png,
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"Test writing to png with non-zero origin",
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"record, transform", /* keywords */
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NULL, /* requirements */
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4, 4,
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NULL, draw)
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