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tests: add unit test for premultiplied alpha handling of video overlay rectangles

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https://bugzilla.gnome.org/show_bug.cgi?id=668483
This commit is contained in:
Tim-Philipp Müller 2012-03-14 17:59:31 +00:00
parent 2c4b379470
commit 87a9e5634e
1 changed files with 114 additions and 0 deletions
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114
tests/check/libs/video.c
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@ -3,6 +3,7 @@
* Copyright (C) <2003> David A. Schleef <ds@schleef.org>
* Copyright (C) <2006> Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) <2008,2011> Tim-Philipp Müller <tim centricular net>
* Copyright (C) <2012> Collabora Ltd. <tim.muller@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -924,6 +925,118 @@ GST_START_TEST (test_overlay_composition)
GST_END_TEST;
GST_START_TEST (test_overlay_composition_premultiplied_alpha)
{
GstVideoOverlayRectangle *rect1;
GstBuffer *pix1, *pix2, *pix3, *pix4, *pix5;
GstBuffer *pix6, *pix7, *pix8, *pix9, *pix10;
guint8 *data5, *data7;
guint w, h, stride, w2, h2, stride2;
pix1 = gst_buffer_new_and_alloc (200 * sizeof (guint32) * 50);
memset (GST_BUFFER_DATA (pix1), 0x80, GST_BUFFER_SIZE (pix1));
rect1 = gst_video_overlay_rectangle_new_argb (pix1, 200, 50, 200 * 4,
600, 50, 300, 50, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
gst_buffer_unref (pix1);
/* same flags, unscaled, should be the same buffer */
pix2 = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect1, &w, &h,
&stride, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
fail_unless (pix1 == pix2);
/* same flags, but scaled */
pix3 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride,
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
fail_if (pix3 == pix1 || pix3 == pix2);
/* same again, should hopefully get the same (cached) buffer as before */
pix4 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride,
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
fail_unless (pix4 == pix3);
/* just to update the vars */
pix2 = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect1, &w, &h,
&stride, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
/* now, let's try to get premultiplied alpha from the unpremultiplied input */
pix5 = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect1, &w2, &h2,
&stride2, GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
fail_if (pix5 == pix1 || pix5 == pix2 || pix5 == pix3);
fail_unless_equals_int (stride, stride2);
fail_unless_equals_int (w, w2);
fail_unless_equals_int (h, h2);
fail_unless_equals_int (GST_BUFFER_SIZE (pix2), GST_BUFFER_SIZE (pix5));
data5 = GST_BUFFER_DATA (pix5);
fail_if (memcmp (data5, GST_BUFFER_DATA (pix2), GST_BUFFER_SIZE (pix5)) == 0);
/* make sure it actually did what we expected it to do (input=0x80808080) */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* B - G - R - A */
fail_unless_equals_int (data5[0], 0x40);
fail_unless_equals_int (data5[1], 0x40);
fail_unless_equals_int (data5[2], 0x40);
fail_unless_equals_int (data5[3], 0x80);
#else
/* A - R - G - B */
fail_unless_equals_int (data5[0], 0x40);
fail_unless_equals_int (data5[1], 0x40);
fail_unless_equals_int (data5[2], 0x40);
fail_unless_equals_int (data5[3], 0x80);
#endif
/* same again, now we should be getting back the same buffer as before,
* as it should have been cached */
pix6 = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect1, &w2, &h2,
&stride2, GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
fail_unless (pix6 == pix5);
/* just to update the stride var */
pix3 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride,
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
fail_unless (pix3 == pix4);
/* now try to get scaled premultiplied alpha from unpremultiplied input */
pix7 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride2,
GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
fail_if (pix7 == pix1 || pix7 == pix2 || pix7 == pix3 || pix7 == pix5);
fail_unless_equals_int (stride, stride2);
data7 = GST_BUFFER_DATA (pix7);
/* make sure it actually did what we expected it to do (input=0x80808080)
* hoping that the scaling didn't mess up our values */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* B - G - R - A */
fail_unless_equals_int (data7[0], 0x40);
fail_unless_equals_int (data7[1], 0x40);
fail_unless_equals_int (data7[2], 0x40);
fail_unless_equals_int (data7[3], 0x80);
#else
/* A - R - G - B */
fail_unless_equals_int (data7[0], 0x40);
fail_unless_equals_int (data7[1], 0x40);
fail_unless_equals_int (data7[2], 0x40);
fail_unless_equals_int (data7[3], 0x80);
#endif
/* and the same again, it should be cached now */
pix8 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride2,
GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
fail_unless (pix8 == pix7);
/* make sure other cached stuff is still there */
pix9 = gst_video_overlay_rectangle_get_pixels_argb (rect1, &stride,
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
fail_unless (pix9 == pix3);
pix10 = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect1, &w2, &h2,
&stride2, GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
fail_unless (pix10 == pix5);
gst_video_overlay_rectangle_unref (rect1);
}
GST_END_TEST;
static Suite *
video_suite (void)
{
@ -941,6 +1054,7 @@ video_suite (void)
tcase_add_test (tc_chain, test_convert_frame_async);
tcase_add_test (tc_chain, test_video_size_from_caps);
tcase_add_test (tc_chain, test_overlay_composition);
tcase_add_test (tc_chain, test_overlay_composition_premultiplied_alpha);
return s;
}