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

[Bryce W. Harrington]

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>
---
 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";
+
+/* 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
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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
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literal 0
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-- 
1.7.9.5