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17fbb652b1
As Behdad suggested, we can dramatically speed up the test suite by short-circuiting the write to a png file, only to then immediately read it back in. So for the raster based surfaces, we avoid the round-trip through libpng by implementing a new boilerplate method to directly extract the image buffer from the test result. A secondary speedup is achieved by caching the most recent reference image.
105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/* imagediff - Compare two images
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*
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* Copyright © 2004 Richard D. Worth
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* Copyright © 2006 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 the authors
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* not be used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* The authors make no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
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* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Authors: Richard D. Worth <richard@theworths.org>
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* Carl Worth <cworth@cworth.org>
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*/
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#ifndef BUFFER_DIFF_H
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#define BUFFER_DIFF_H
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#include "cairo-test.h"
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typedef struct _buffer_diff_result {
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unsigned int pixels_changed;
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unsigned int max_diff;
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} buffer_diff_result_t;
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/* Compares two image buffers ignoring the alpha channel.
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*
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* Provides number of pixels changed and maximum single-channel
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* difference in result.
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*
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* Also fills in a "diff" buffer intended to visually show where the
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* images differ.
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*/
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void
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buffer_diff_noalpha (const unsigned char *buf_a,
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const unsigned char *buf_b,
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unsigned char *buf_diff,
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int width,
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int height,
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int stride,
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buffer_diff_result_t *result);
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/* Compares two image buffers ignoring the alpha channel. A return
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* value of CAIRO_STATUS_SUCCESS indicates that a comparison was made,
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* (but the images may or may not differ). Failure modes include
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* CAIRO_STATUS_FILE_NOT_FOUND, CAIRO_STATUS_READ_ERROR,
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* CAIRO_STATUS_NO_MEMORY, and CAIRO_STATUS_SURFACE_TYPE_MISMATCH
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* (which is used if the image sizes differ).
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*
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* Provides number of pixels changed and maximum single-channel
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* difference in result.
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*
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* Also saves a "diff" image intended to visually show where the
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* images differ.
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*/
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cairo_status_t
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png_diff (const cairo_test_context_t *ctx,
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const char *filename_a,
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const char *filename_b,
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const char *filename_diff,
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int ax,
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int ay,
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int bx,
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int by,
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buffer_diff_result_t *result);
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/* Like png_diff, but blending the contents of b over white first. */
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cairo_status_t
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png_diff_flattened (const cairo_test_context_t *ctx,
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const char *filename_a,
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const char *filename_b,
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const char *filename_diff,
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int ax,
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int ay,
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int bx,
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int by,
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buffer_diff_result_t *result);
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/* The central algorithm to compare two images, and return the differences
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* in the surface_diff.
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*
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* Provides number of pixels changed and maximum single-channel
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* difference in result.
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*/
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cairo_status_t
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image_diff (const cairo_test_context_t *ctx,
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cairo_surface_t *surface_a,
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cairo_surface_t *surface_b,
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cairo_surface_t *surface_diff,
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buffer_diff_result_t *result);
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#endif
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