Move avifImageIsOpaque() from write.c to avif.h
Make it public so that it can be used in aviftest_helpers.cc and by
users.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 632ba7a..e340ff8 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -98,6 +98,11 @@
target_include_directories(avifmetadatatest PRIVATE ${GTEST_INCLUDE_DIRS})
add_test(NAME avifmetadatatest COMMAND avifmetadatatest ${CMAKE_CURRENT_SOURCE_DIR}/data/)
+ add_executable(avifopaquetest gtest/avifopaquetest.cc)
+ target_link_libraries(avifopaquetest aviftest_helpers ${GTEST_BOTH_LIBRARIES})
+ target_include_directories(avifopaquetest PRIVATE ${GTEST_INCLUDE_DIRS})
+ add_test(NAME avifopaquetest COMMAND avifopaquetest)
+
add_executable(avifrgbtoyuvtest gtest/avifrgbtoyuvtest.cc)
target_link_libraries(avifrgbtoyuvtest aviftest_helpers ${GTEST_BOTH_LIBRARIES})
target_include_directories(avifrgbtoyuvtest PRIVATE ${GTEST_INCLUDE_DIRS})
