[PATCH 8/8] tests/acceptance: Count Raspberry Pi logos displayed on framebuffer

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Add a test that verifies that each core properly displays the
Raspberry Pi logo on the framebuffer device.

We simply follow the OpenCV "Template Matching with Multiple Objects"
tutorial, replacing Lionel Messi by a raspberrry:
https://docs.opencv.org/4.2.0/d4/dc6/tutorial_py_template_matching.html

When OpenCV and NumPy are installed, this test can be run using:

  $ avocado --show=app,framebuffer run -t device:bcm2835-fb tests/acceptance/
  JOB ID     : 9bbbc54c0a6fa180348d0b5305507f76852b4da2
  JOB LOG    : avocado/job-results/job-2020-01-31T23.48-9bbbc54/job.log
   (1/1) tests/acceptance/boot_linux_console.py:BootLinuxConsole.test_arm_raspi2_framebuffer_logo:
  framebuffer: found raspberry at position (x, y) = (0, 0)
  framebuffer: found raspberry at position (x, y) = (71, 0)
  framebuffer: found raspberry at position (x, y) = (142, 0)
  framebuffer: found raspberry at position (x, y) = (213, 0)
  PASS (11.06 s)
  RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
  JOB TIME   : 11.39 s

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
The resulting match can be visualised at https://pasteboard.co/ISzNHtx.png
---
 tests/acceptance/boot_linux_console.py | 62 ++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tests/acceptance/boot_linux_console.py b/tests/acceptance/boot_linux_console.py
index 989db7d461..7c960051a6 100644
--- a/tests/acceptance/boot_linux_console.py
+++ b/tests/acceptance/boot_linux_console.py
@@ -12,6 +12,7 @@
 import lzma
 import gzip
 import shutil
+import logging
 
 from avocado import skipUnless
 from avocado_qemu import Test
@@ -22,6 +23,19 @@
 from avocado.utils import archive
 
 
+NUMPY_AVAILABLE = True
+try:
+    import numpy as np
+except ImportError:
+    NUMPY_AVAILABLE = False
+
+CV2_AVAILABLE = True
+try:
+    import cv2
+except ImportError:
+    CV2_AVAILABLE = False
+
+
 class BootLinuxConsole(Test):
     """
     Boots a Linux kernel and checks that the console is operational and the
@@ -451,6 +465,54 @@ def test_arm_raspi2_uart1(self):
         """
         self.do_test_arm_raspi(2, 'bcm2835_aux')
 
+    @skipUnless(NUMPY_AVAILABLE, 'Python NumPy not installed')
+    @skipUnless(CV2_AVAILABLE, 'Python OpenCV not installed')
+    def test_arm_raspi2_framebuffer_logo(self):
+        """
+        :avocado: tags=arch:arm
+        :avocado: tags=machine:raspi2
+        :avocado: tags=device:bcm2835-fb
+        """
+        screendump_path = os.path.join(self.workdir, 'screendump.pbm')
+        rpilogo_url = ('https://github.com/raspberrypi/linux/raw/'
+                       'raspberrypi-kernel_1.20190517-1/'
+                       'drivers/video/logo/logo_linux_clut224.ppm')
+        rpilogo_hash = 'fff3cc20c6030acce0953147f9baac43f44ed6b0'
+        rpilogo_path = self.fetch_asset(rpilogo_url, asset_hash=rpilogo_hash)
+        deb_url = ('http://archive.raspberrypi.org/debian/'
+                   'pool/main/r/raspberrypi-firmware/'
+                   'raspberrypi-kernel_1.20190215-1_armhf.deb')
+        deb_hash = 'cd284220b32128c5084037553db3c482426f3972'
+        deb_path = self.fetch_asset(deb_url, asset_hash=deb_hash)
+        kernel_path = self.extract_from_deb(deb_path, '/boot/kernel7.img')
+        dtb_path = self.extract_from_deb(deb_path, '/boot/bcm2709-rpi-2-b.dtb')
+
+        self.vm.set_console()
+        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
+                               'earlycon=pl011,0x3f201000 console=ttyAMA0')
+        self.vm.add_args('-kernel', kernel_path,
+                         '-dtb', dtb_path,
+                         '-append', kernel_command_line)
+        self.vm.launch()
+        framebuffer_ready = 'Console: switching to colour frame buffer device'
+        wait_for_console_pattern(self, framebuffer_ready)
+        self.vm.command('human-monitor-command', command_line='stop')
+        self.vm.command('human-monitor-command',
+                        command_line='screendump %s' % screendump_path)
+        logger = logging.getLogger('framebuffer')
+
+        cpu_cores_count = 4
+        match_threshold = 0.95
+        screendump_bgr = cv2.imread(screendump_path, cv2.IMREAD_COLOR)
+        rpilogo_bgr = cv2.imread(rpilogo_path, cv2.IMREAD_COLOR)
+        result = cv2.matchTemplate(screendump_bgr, rpilogo_bgr,
+                                   cv2.TM_CCOEFF_NORMED)
+        loc = np.where(result >= match_threshold)
+        rpilogo_count = 0
+        for rpilogo_count, pt in enumerate(zip(*loc[::-1]), start=1):
+            logger.debug('found raspberry at position (x, y) = %s', pt)
+        self.assertGreaterEqual(rpilogo_count, cpu_cores_count)
+
     def test_arm_exynos4210_initrd(self):
         """
         :avocado: tags=arch:arm
-- 
2.21.1