[cairo] [PATCH 3/3] test: Exercise image scaling quality when downscaling
Bryce W. Harrington
b.harrington at samsung.com
Thu Jul 11 18:37:54 PDT 2013
This adds testcases for the various cairo filter options, each of which
match to corresponding pixman filters.
The 96-pixel reference images are simply copies of the original
quad-color.png file. It is assumed that 1:1 downscaling operations
should produce no visible change to the original image.
The 24-pixel reference images were produced from quad-color.png using
Gimp's Scale Image command with Interpolation set to None. It is
assumed that all filters should handle a 1:4 scaling cleanly with no
antialiased blurring.
The 95-pixel reference images assume differing types of antialiasing
based on the quality level. These were produced with Gimp's Scale Image
command at a resolution of 72 pixels/inch, with different Interpolation
levels for each of Cairo's filter quality levels, as follows:
Cairo Filter Gimp Interpolation
------------ ------------------
CAIRO_FILTER_NEAREST Linear
CAIRO_FILTER_FAST Linear
CAIRO_FILTER_BILINEAR Cubic
CAIRO_FILTER_GOOD Cubic
CAIRO_FILTER_BEST Lanczos3
These assumptions may need adjustment as development on this code
progresses.
Signed-off-by: Bryce Harrington <b.harrington at samsung.com>
---
test/pixman-downscale.c | 140 ++++++++++++++++++--
test/reference/pixman-downscale-24.ref.png | Bin 191 -> 0 bytes
test/reference/pixman-downscale-95.ref.png | Bin 285 -> 0 bytes
test/reference/pixman-downscale-96.ref.png | Bin 301 -> 0 bytes
test/reference/pixman-downscale-best-24.ref.png | Bin 0 -> 191 bytes
test/reference/pixman-downscale-best-95.ref.png | Bin 0 -> 1580 bytes
test/reference/pixman-downscale-best-96.ref.png | Bin 0 -> 301 bytes
.../reference/pixman-downscale-bilinear-24.ref.png | Bin 0 -> 191 bytes
.../reference/pixman-downscale-bilinear-95.ref.png | Bin 0 -> 640 bytes
.../reference/pixman-downscale-bilinear-96.ref.png | Bin 0 -> 301 bytes
test/reference/pixman-downscale-fast-24.ref.png | Bin 0 -> 191 bytes
test/reference/pixman-downscale-fast-95.ref.png | Bin 0 -> 453 bytes
test/reference/pixman-downscale-fast-96.ref.png | Bin 0 -> 301 bytes
test/reference/pixman-downscale-good-24.ref.png | Bin 0 -> 191 bytes
test/reference/pixman-downscale-good-95.ref.png | Bin 0 -> 640 bytes
test/reference/pixman-downscale-good-96.ref.png | Bin 0 -> 301 bytes
test/reference/pixman-downscale-nearest-24.ref.png | Bin 0 -> 191 bytes
test/reference/pixman-downscale-nearest-95.ref.png | Bin 0 -> 453 bytes
test/reference/pixman-downscale-nearest-96.ref.png | Bin 0 -> 301 bytes
19 files changed, 129 insertions(+), 11 deletions(-)
delete mode 100644 test/reference/pixman-downscale-24.ref.png
delete mode 100644 test/reference/pixman-downscale-95.ref.png
delete mode 100644 test/reference/pixman-downscale-96.ref.png
create mode 100644 test/reference/pixman-downscale-best-24.ref.png
create mode 100644 test/reference/pixman-downscale-best-95.ref.png
create mode 100644 test/reference/pixman-downscale-best-96.ref.png
create mode 100644 test/reference/pixman-downscale-bilinear-24.ref.png
create mode 100644 test/reference/pixman-downscale-bilinear-95.ref.png
create mode 100644 test/reference/pixman-downscale-bilinear-96.ref.png
create mode 100644 test/reference/pixman-downscale-fast-24.ref.png
create mode 100644 test/reference/pixman-downscale-fast-95.ref.png
create mode 100644 test/reference/pixman-downscale-fast-96.ref.png
create mode 100644 test/reference/pixman-downscale-good-24.ref.png
create mode 100644 test/reference/pixman-downscale-good-95.ref.png
create mode 100644 test/reference/pixman-downscale-good-96.ref.png
create mode 100644 test/reference/pixman-downscale-nearest-24.ref.png
create mode 100644 test/reference/pixman-downscale-nearest-95.ref.png
create mode 100644 test/reference/pixman-downscale-nearest-96.ref.png
diff --git a/test/pixman-downscale.c b/test/pixman-downscale.c
index 1f8a9b4..ac9d016 100644
--- a/test/pixman-downscale.c
+++ b/test/pixman-downscale.c
@@ -36,7 +36,7 @@ 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)
+draw (cairo_t *cr, int width, int height, cairo_filter_t filter)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
cairo_surface_t *image;
@@ -49,7 +49,7 @@ draw (cairo_t *cr, int width, int height)
scale = fmin(x_scale, y_scale);
cairo_save (cr);
- cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_FAST);
+ cairo_pattern_set_filter (cairo_get_source (cr), filter);
cairo_scale (cr, scale, scale);
cairo_set_source_surface (cr, image, 0, 0);
cairo_paint (cr);
@@ -59,23 +59,141 @@ draw (cairo_t *cr, int width, int height)
return CAIRO_TEST_SUCCESS;
}
-CAIRO_TEST (pixman_downscale_96,
- "Tests scaling to equivalent size",
+static cairo_test_status_t
+draw_fast (cairo_t *cr, int width, int height)
+{
+ return draw (cr, width, height, CAIRO_FILTER_FAST);
+}
+
+static cairo_test_status_t
+draw_good (cairo_t *cr, int width, int height)
+{
+ return draw (cr, width, height, CAIRO_FILTER_GOOD);
+}
+
+static cairo_test_status_t
+draw_best (cairo_t *cr, int width, int height)
+{
+ return draw (cr, width, height, CAIRO_FILTER_BEST);
+}
+
+static cairo_test_status_t
+draw_nearest (cairo_t *cr, int width, int height)
+{
+ return draw (cr, width, height, CAIRO_FILTER_NEAREST);
+}
+
+static cairo_test_status_t
+draw_bilinear (cairo_t *cr, int width, int height)
+{
+ return draw (cr, width, height, CAIRO_FILTER_BILINEAR);
+}
+
+CAIRO_TEST (pixman_downscale_fast_96,
+ "Tests scaling to equivalent size using the fast filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 96, 96,
+ NULL, draw_fast)
+
+CAIRO_TEST (pixman_downscale_fast_95,
+ "Tests downscaling by a single pixel using the fast filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 95, 95,
+ NULL, draw_fast)
+
+CAIRO_TEST (pixman_downscale_fast_24,
+ "Tests downscaling by an even multiple using the fast filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 24, 24,
+ NULL, draw_fast)
+
+
+CAIRO_TEST (pixman_downscale_good_96,
+ "Tests scaling to equivalent size using the good filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 96, 96,
+ NULL, draw_good)
+
+CAIRO_TEST (pixman_downscale_good_95,
+ "Tests downscaling by a single pixel using the good filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 95, 95,
+ NULL, draw_good)
+
+CAIRO_TEST (pixman_downscale_good_24,
+ "Tests downscaling by an even multiple using the good filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 24, 24,
+ NULL, draw_good)
+
+
+CAIRO_TEST (pixman_downscale_best_96,
+ "Tests scaling to equivalent size using the best filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 96, 96,
+ NULL, draw_best)
+
+CAIRO_TEST (pixman_downscale_best_95,
+ "Tests downscaling by a single pixel using the best filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 95, 95,
+ NULL, draw_best)
+
+CAIRO_TEST (pixman_downscale_best_24,
+ "Tests downscaling by an even multiple using the best filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 24, 24,
+ NULL, draw_best)
+
+
+CAIRO_TEST (pixman_downscale_nearest_96,
+ "Tests scaling to equivalent size using the nearest filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 96, 96,
+ NULL, draw_nearest)
+
+CAIRO_TEST (pixman_downscale_nearest_95,
+ "Tests downscaling by a single pixel using the nearest filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 95, 95,
+ NULL, draw_nearest)
+
+CAIRO_TEST (pixman_downscale_nearest_24,
+ "Tests downscaling by an even multiple using the nearest filter",
+ "image, transform, raster", /* keywords */
+ NULL, /* requirements */
+ 24, 24,
+ NULL, draw_nearest)
+
+
+CAIRO_TEST (pixman_downscale_bilinear_96,
+ "Tests scaling to equivalent size using the bilinear filter",
"image, transform, raster", /* keywords */
NULL, /* requirements */
96, 96,
- NULL, draw)
+ NULL, draw_bilinear)
-CAIRO_TEST (pixman_downscale_95,
- "Tests downscaling by a single pixel",
+CAIRO_TEST (pixman_downscale_bilinear_95,
+ "Tests downscaling by a single pixel using the bilinear filter",
"image, transform, raster", /* keywords */
NULL, /* requirements */
95, 95,
- NULL, draw)
+ NULL, draw_bilinear)
-CAIRO_TEST (pixman_downscale_24,
- "Tests downscaling by an even multiple",
+CAIRO_TEST (pixman_downscale_bilinear_24,
+ "Tests downscaling by an even multiple using the bilinear filter",
"image, transform, raster", /* keywords */
NULL, /* requirements */
24, 24,
- NULL, draw)
+ NULL, draw_bilinear)
diff --git a/test/reference/pixman-downscale-24.ref.png b/test/reference/pixman-downscale-24.ref.png
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--
1.7.9.5
--
Bryce Harrington
Senior Open Source Developer - b.harrington at samsung.com
Open Source Group - Samsung Research America
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