libcamera: pipeline: Add test pattern for VirtualPipelineHandler

Add a test pattern generator class hierarchy for the Virtual
pipeline handler.

Implement two types of test patterns: color bars and diagonal lines
generator and use them in the Virtual pipeline handler.

A shifting mechanism is enabled. For each frame, the image is shifted to
the left by 1 pixel. It drops FPS though.

Add a dependency for libyuv to the build system to generate images
in NV12 format from the test pattern.

Signed-off-by: Konami Shu <konamiz@google.com>
Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Signed-off-by: Harvey Yang <chenghaoyang@chromium.org>
Co-developed-by: Yunke Cao <yunkec@chromium.org>
Signed-off-by: Yunke Cao <yunkec@chromium.org>
Co-developed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/android/meson.build

@@ -15,25 +15,6 @@ foreach dep : android_deps
     endif
 endforeach
 
-libyuv_dep = dependency('libyuv', required : false)
-
-# Fallback to a subproject if libyuv isn't found, as it's typically not
-# provided by distributions.
-if not libyuv_dep.found()
-    cmake = import('cmake')
-
-    libyuv_vars = cmake.subproject_options()
-    libyuv_vars.add_cmake_defines({'CMAKE_POSITION_INDEPENDENT_CODE': 'ON'})
-    libyuv_vars.set_override_option('cpp_std', 'c++17')
-    libyuv_vars.append_compile_args('cpp',
-         '-Wno-sign-compare',
-         '-Wno-unused-variable',
-         '-Wno-unused-parameter')
-    libyuv_vars.append_link_args('-ljpeg')
-    libyuv = cmake.subproject('libyuv', options : libyuv_vars)
-    libyuv_dep = libyuv.dependency('yuv')
-endif
-
 android_deps += [libyuv_dep]
 
 android_hal_sources = files([