[PATCH] meson: Don't unnecessarily fallback to libyuv wrap

[Laurent Pinchart]

Before commit eeaa7de21b8c ("libcamera: pipeline: Add test pattern for
VirtualPipelineHandler") the libyuv dependency was only needed for the
Android adaptation layer. As libyuv isn't packaged by most distribution,
meson fell back to using a meson wrap if the Android adaptation layer
was enabled and the library wasn't found.

With commit eeaa7de21b8c, libyuv is also used by the virtual pipeline
handler, and the meson wrap fallback handling got centralized and became
unconditional, so the wrap is downloaded even if the components
depending on libyuv are all disabled. This causes unnecessary downloads
at setup time, which can be problematic on build systems without an
internet connection.

Fix this by making the wrap fallback conditional on the components that
use libyuv.

Fixes: eeaa7de21b8c ("libcamera: pipeline: Add test pattern for VirtualPipelineHandler")
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/android/meson.build | 3 +--
 src/meson.build         | 8 +++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/android/meson.build b/src/android/meson.build
index 6341ee8b0bfb..7b226a4b5d35 100644
--- a/src/android/meson.build
+++ b/src/android/meson.build
@@ -4,6 +4,7 @@ android_deps = [
     dependency('libexif', required : get_option('android')),
     dependency('libjpeg', required : get_option('android')),
     libcamera_private,
+    libyuv_dep,
 ]
 
 android_enabled = true
@@ -15,8 +16,6 @@ foreach dep : android_deps
     endif
 endforeach
 
-android_deps += [libyuv_dep]
-
 android_hal_sources = files([
     'camera3_hal.cpp',
     'camera_capabilities.cpp',
diff --git a/src/meson.build b/src/meson.build
index 91bea7753a2e..76198e9535db 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -27,11 +27,13 @@ else
     ipa_sign_module = false
 endif
 
+# libyuv, used by the Android adaptation layer and the virtual pipeline handler.
+# Fallback to a subproject if libyuv isn't found, as it's typically not provided
+# by distributions.
 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()
+if (pipelines.contains('virtual') or get_option('android').allowed()) and \
+   not libyuv_dep.found()
     cmake = import('cmake')
 
     libyuv_vars = cmake.subproject_options()

base-commit: 9a5f91c78abc8985baff89563992be3644f861b0
-- 
Regards,

Laurent Pinchart