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[cmake] CheckPNG.cmake: Check if the system libpng supports APNG.

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If it doesn't, a warning message is displayed.

A CMake variable HAVE_PNG_APNG is set, but it isn't used for anything yet.
This commit is contained in:
David Korth 2025-01-10 23:46:09 -05:00
parent 9d2129e72b
commit 6b20b688a8
1 changed files with 11 additions and 1 deletions
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12
cmake/libs/CheckPNG.cmake
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@ -13,8 +13,17 @@ IF(NOT USE_INTERNAL_PNG)
FIND_PACKAGE(PNG)
IF(PNG_FOUND)
# Found system libpng.
# TODO: APNG check?
SET(HAVE_PNG 1)
# Check for APNG support.
INCLUDE(CheckFunctionExists)
SET(CMAKE_REQUIRED_LIBRARIES "${PNG_LIBRARY}")
CHECK_FUNCTION_EXISTS("png_get_acTL" HAVE_PNG_APNG)
UNSET(CMAKE_REQUIRED_LIBRARIES)
IF(NOT HAVE_PNG_APNG)
MESSAGE(WARNING "System libpng does not support APNG.\nAPNG output will be disabled.")
ENDIF(NOT HAVE_PNG_APNG)
ELSE()
# System libpng was not found.
MESSAGE(STATUS "Using the internal copy of libpng since a system version was not found.")
@ -28,6 +37,7 @@ IF(USE_INTERNAL_PNG)
# Using the internal PNG library.
SET(PNG_FOUND 1)
SET(HAVE_PNG 1)
SET(HAVE_PNG_APNG 1 CACHE INTERNAL "Have function png_get_acTL" FORCE)
IF(WIN32 OR APPLE)
# Using DLLs on Windows and Mac OS X.
SET(USE_INTERNAL_PNG_DLL ON)