[cairo] [PATCH 1/3 v2] test: Add test for image downscaling

[Uli Schlachter]

On 10.09.2013 00:59, Bryce W. Harrington wrote:
> This adds pixman-downscale.c, which tests correctness of PNG images
> scaled down using pixman routines.
> 
> Signed-off-by: Bryce Harrington <b.harrington at samsung.com>
> ---

This does not build:

  CC       cairo_test_suite-pixman-downscale.o
pixman-downscale.c: In function ‘draw’:
pixman-downscale.c:47:15: error: ‘WIDTH’ undeclared (first use in this function)
pixman-downscale.c:47:15: note: each undeclared identifier is reported only once
for each function it appears in
pixman-downscale.c:48:15: error: ‘HEIGHT’ undeclared (first use in this function)

>  test/Makefile.sources                   |    1 +
>  test/pixman-downscale.c                 |   68 +++++++++++++++++++++++++++++++
>  test/quad-color.png                     |  Bin 0 -> 301 bytes
>  test/reference/pixman-downscale.ref.png |  Bin 0 -> 191 bytes
>  4 files changed, 69 insertions(+)
>  create mode 100644 test/pixman-downscale.c
>  create mode 100644 test/quad-color.png
>  create mode 100644 test/reference/pixman-downscale.ref.png
> 
> diff --git a/test/Makefile.sources b/test/Makefile.sources
> index 509c11c..9fbfb96 100644
> --- a/test/Makefile.sources
> +++ b/test/Makefile.sources
> @@ -248,6 +248,7 @@ test_sources = \
>  	pattern-get-type.c				\
>  	pattern-getters.c				\
>  	pdf-isolated-group.c				\
> +	pixman-downscale.c				\
>  	pixman-rotate.c					\
>  	png.c						\
>  	push-group.c					\
> diff --git a/test/pixman-downscale.c b/test/pixman-downscale.c
> new file mode 100644
> index 0000000..0562015
> --- /dev/null
> +++ b/test/pixman-downscale.c
> @@ -0,0 +1,68 @@
> +/*
> + * Copyright © 2013 Samsung Electronics
> + *
> + * Permission is hereby granted, free of charge, to any person
> + * obtaining a copy of this software and associated documentation
> + * files (the "Software"), to deal in the Software without
> + * restriction, including without limitation the rights to use, copy,
> + * modify, merge, publish, distribute, sublicense, and/or sell copies
> + * of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be
> + * included in all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + *
> + * Author: Bryce Harrington <b.harrington at samsung.com>
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <math.h>
> +
> +#include <cairo.h>
> +
> +#include "cairo-test.h"
> +
> +static const char *png_filename = "quad-color.png";

Shouldn't make much of a difference, but can you make this const char[] instead?
(I only noticed this because you did the same in one of your other test suite
patches.)

> +
> +/* Draw an image scaled down, with antialiasing disabled */
> +static cairo_test_status_t
> +draw (cairo_t *cr, int width, int height)
> +{
> +    const cairo_test_context_t *ctx = cairo_test_get_context (cr);
> +    cairo_surface_t *image;
> +    double x_scale, y_scale, scale;
> +
> +    cairo_set_source_rgb (cr, 1, 1, 1);
> +    image = cairo_test_create_surface_from_png (ctx, png_filename);
> +    x_scale = WIDTH * 1.0 / cairo_image_surface_get_width (image);
> +    y_scale = HEIGHT * 1.0 / cairo_image_surface_get_height (image);
> +    scale = fmin(x_scale, y_scale);
> +
> +    cairo_save (cr);
> +    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
> +    cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
> +    cairo_scale (cr, scale, scale);
> +    cairo_set_source_surface (cr, image, 0, 0);
> +    cairo_paint (cr);
> +    cairo_restore (cr);
> +    cairo_surface_destroy (image);
> +
> +    return CAIRO_TEST_SUCCESS;
> +}
> +
> +CAIRO_TEST (pixman_downscale,
> +	    "Exposes errors when downscaling",
> +	    "image, transform, raster", /* keywords */
> +	    NULL, /* requirements */
> +	    96, 96,
> +	    NULL, draw)
> diff --git a/test/quad-color.png b/test/quad-color.png
> new file mode 100644
> index 0000000000000000000000000000000000000000..0d68a82cc27532aa78fc12af7646f6821a730a2b
> GIT binary patch
> literal 301
> zcmeAS at N?(olHy`uVBq!ia0vp^2_VeD1SE5RJ;(=AY)RhkE)4%caKYZ?lYt_SJY5_^
> zD(1Ysy^*iUK*S+1>rej2(}h=B at 0d(;Js;WVUVNE%S1wQ;!=K59zYi43gs*v=>!Y8U
> z_vgvq?cQM at omse;SR0!h92Y1A>{u^la;*65g4(k)k}t|wYjB7lNebZM8vKpTne!)c
> zbN%i~M<*ZqX0g}kFdxELd^!~Z1T at ab2krlH<ByqM{lP1D%YXuKdqK|r at Q}6kF=t0)
> R<@7`l*VEO{Wt~$(698O(XEy)<
> 
> literal 0
> HcmV?d00001
> 
> diff --git a/test/reference/pixman-downscale.ref.png b/test/reference/pixman-downscale.ref.png
> new file mode 100644
> index 0000000000000000000000000000000000000000..df0f9c0d84f3f48d00fdb0f3f08ae587754a269d
> GIT binary patch
> literal 191
> zcmeAS at N?(olHy`uVBq!ia0vp^5+KaM1SIoCSFHz9jKx9jP7LeL$-D$|I14-?iy0WW
> zg+Z8+Vb&awa`qBWUsv|K>|BC!7IA*pm4QNmo-U3d7N_3^pXOpv;3&RWA0EGNU1}T4
> zrIUAMg4_8gwy>{ZJlV~aSJYV)vi6&EaICP+3<LMb7lqjZ5!yx;9>LS69R3%PQJ;M;
> gq~!8p8PysezC2Ei17|)i02<EV>FVdQ&MBb at 0ICT&&j0`b
> 
> literal 0
> HcmV?d00001

Also, I don't know why, but the mail body is base64 encoded and contains dos
line endings which "git am" does not like. This made it a little harder to apply
the patch.

Uli
-- 
- Buck, when, exactly, did you lose your mind?
- Three months ago. I woke up one morning married to a pineapple.
  An ugly pineapple... But I loved her.