drm_hwcomposer: Use __ANDROID_API__ instead of PLATFORM_SDK_VERSION

__ANDROID_API__ definition is available by default in AOSP and NDK.

It also exported by standard system clang when the user sets
the '-target <ARCH>-linux-android<LEVEL>' compiler flag.

Reason for this change is integration of meson build script, where
otherwise the user has to provide the API level manually.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/.ci/Makefile b/.ci/Makefile
index ea9e85b..66922be 100644
--- a/.ci/Makefile
+++ b/.ci/Makefile
@@ -7,7 +7,7 @@
 OUT_DIR := /tmp/drm_hwcomposer/build
 SRC_DIR := .
 
-CXXFLAGS := -fPIC -Wall -Wextra -Werror -DPLATFORM_SDK_VERSION=31 -D__ANDROID_API__=31
+CXXFLAGS := -fPIC -Wall -Wextra -Werror -D__ANDROID_API__=31
 CXXFLAGS += -D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS
 CXXFLAGS += -fvisibility-inlines-hidden -std=gnu++17 -DHWC2_USE_CPP11 -DHWC2_INCLUDE_STRINGIFICATION -fno-rtti
 
diff --git a/Android.bp b/Android.bp
index a55e070..92e2bc3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -68,12 +68,6 @@
         "-std=c++17",
     ],
 
-    product_variables: {
-        platform_sdk_version: {
-            cflags: ["-DPLATFORM_SDK_VERSION=%d"],
-        },
-    },
-
     relative_install_path: "hw",
     vendor: true,
 }
diff --git a/bufferinfo/BufferInfoGetter.cpp b/bufferinfo/BufferInfoGetter.cpp
index 5716176..726b4eb 100644
--- a/bufferinfo/BufferInfoGetter.cpp
+++ b/bufferinfo/BufferInfoGetter.cpp
@@ -18,7 +18,7 @@
 
 #include "BufferInfoGetter.h"
 
-#if PLATFORM_SDK_VERSION >= 30
+#if __ANDROID_API__ >= 30
 #include "BufferInfoMapperMetadata.h"
 #endif
 
@@ -38,7 +38,7 @@
 BufferInfoGetter *BufferInfoGetter::GetInstance() {
   static std::unique_ptr<BufferInfoGetter> inst;
   if (!inst) {
-#if PLATFORM_SDK_VERSION >= 30 && defined(USE_IMAPPER4_METADATA_API)
+#if __ANDROID_API__ >= 30 && defined(USE_IMAPPER4_METADATA_API)
     inst.reset(BufferInfoMapperMetadata::CreateInstance());
     if (!inst) {
       ALOGW(
diff --git a/bufferinfo/BufferInfoMapperMetadata.cpp b/bufferinfo/BufferInfoMapperMetadata.cpp
index bdacb74..823d28a 100644
--- a/bufferinfo/BufferInfoMapperMetadata.cpp
+++ b/bufferinfo/BufferInfoMapperMetadata.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#if PLATFORM_SDK_VERSION >= 30
+#if __ANDROID_API__ >= 30
 
 #define LOG_TAG "hwc-bufferinfo-mappermetadata"
 
diff --git a/hwc2_device/DrmHwcTwo.cpp b/hwc2_device/DrmHwcTwo.cpp
index 4accb07..6facac3 100644
--- a/hwc2_device/DrmHwcTwo.cpp
+++ b/hwc2_device/DrmHwcTwo.cpp
@@ -196,7 +196,7 @@
       vsync_callback_ = std::make_pair(HWC2_PFN_VSYNC(function), data);
       break;
     }
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
     case HWC2::Callback::Vsync_2_4: {
       vsync_2_4_callback_ = std::make_pair(HWC2_PFN_VSYNC_2_4(function), data);
       break;
@@ -239,7 +239,7 @@
     hwc2_display_t displayid, int64_t timestamp,
     [[maybe_unused]] uint32_t vsync_period) const {
   /* vsync callback */
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
   if (vsync_2_4_callback_.first != nullptr &&
       vsync_2_4_callback_.second != nullptr) {
     vsync_2_4_callback_.first(vsync_2_4_callback_.second, displayid, timestamp,
@@ -255,7 +255,7 @@
 void DrmHwcTwo::SendVsyncPeriodTimingChangedEventToClient(
     [[maybe_unused]] hwc2_display_t displayid,
     [[maybe_unused]] int64_t timestamp) const {
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
   hwc_vsync_period_change_timeline_t timeline = {
       .newVsyncAppliedTimeNanos = timestamp,
       .refreshRequired = false,
diff --git a/hwc2_device/DrmHwcTwo.h b/hwc2_device/DrmHwcTwo.h
index 29f61da..7a65853 100644
--- a/hwc2_device/DrmHwcTwo.h
+++ b/hwc2_device/DrmHwcTwo.h
@@ -30,7 +30,7 @@
 
   std::pair<HWC2_PFN_HOTPLUG, hwc2_callback_data_t> hotplug_callback_{};
   std::pair<HWC2_PFN_VSYNC, hwc2_callback_data_t> vsync_callback_{};
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
   std::pair<HWC2_PFN_VSYNC_2_4, hwc2_callback_data_t> vsync_2_4_callback_{};
   std::pair<HWC2_PFN_VSYNC_PERIOD_TIMING_CHANGED, hwc2_callback_data_t>
       period_timing_changed_callback_{};
diff --git a/hwc2_device/HwcDisplay.cpp b/hwc2_device/HwcDisplay.cpp
index cfef776..115b61a 100644
--- a/hwc2_device/HwcDisplay.cpp
+++ b/hwc2_device/HwcDisplay.cpp
@@ -322,7 +322,7 @@
                                kUmPerInch / mm_height)
                          : -1;
       break;
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
     case HWC2::Attribute::ConfigGroup:
       /* Dispite ConfigGroup is a part of HWC2.4 API, framework
        * able to request it even if service @2.1 is used */
@@ -772,7 +772,7 @@
                              (int32_t *)(outVsyncPeriod));
 }
 
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
 HWC2::Error HwcDisplay::GetDisplayConnectionType(uint32_t *outType) {
   if (IsInHeadlessMode()) {
     *outType = static_cast<uint32_t>(HWC2::DisplayConnectionType::Internal);
@@ -850,7 +850,7 @@
 }
 #endif
 
-#if PLATFORM_SDK_VERSION > 28
+#if __ANDROID_API__ > 28
 HWC2::Error HwcDisplay::GetDisplayIdentificationData(uint8_t *outPort,
                                                      uint32_t *outDataSize,
                                                      uint8_t *outData) {
@@ -895,9 +895,9 @@
   return HWC2::Error::Unsupported;
 }
 
-#endif /* PLATFORM_SDK_VERSION > 28 */
+#endif /* __ANDROID_API__ > 28 */
 
-#if PLATFORM_SDK_VERSION > 27
+#if __ANDROID_API__ > 27
 
 HWC2::Error HwcDisplay::GetRenderIntents(
     int32_t mode, uint32_t *outNumIntents,
@@ -933,7 +933,7 @@
   return HWC2::Error::None;
 }
 
-#endif /* PLATFORM_SDK_VERSION > 27 */
+#endif /* __ANDROID_API__ > 27 */
 
 const Backend *HwcDisplay::backend() const {
   return backend_.get();
diff --git a/hwc2_device/HwcDisplay.h b/hwc2_device/HwcDisplay.h
index 40c90a3..0334470 100644
--- a/hwc2_device/HwcDisplay.h
+++ b/hwc2_device/HwcDisplay.h
@@ -68,12 +68,12 @@
                                  uint32_t *num_elements, hwc2_layer_t *layers,
                                  int32_t *layer_requests);
   HWC2::Error GetDisplayType(int32_t *type);
-#if PLATFORM_SDK_VERSION > 27
+#if __ANDROID_API__ > 27
   HWC2::Error GetRenderIntents(int32_t mode, uint32_t *outNumIntents,
                                int32_t *outIntents);
   HWC2::Error SetColorModeWithIntent(int32_t mode, int32_t intent);
 #endif
-#if PLATFORM_SDK_VERSION > 28
+#if __ANDROID_API__ > 28
   HWC2::Error GetDisplayIdentificationData(uint8_t *outPort,
                                            uint32_t *outDataSize,
                                            uint8_t *outData);
@@ -82,7 +82,7 @@
   HWC2::Error GetDisplayBrightnessSupport(bool *supported);
   HWC2::Error SetDisplayBrightness(float);
 #endif
-#if PLATFORM_SDK_VERSION > 29
+#if __ANDROID_API__ > 29
   HWC2::Error GetDisplayConnectionType(uint32_t *outType);
 
   HWC2::Error SetActiveConfigWithConstraints(
diff --git a/hwc2_device/hwc2_device.cpp b/hwc2_device/hwc2_device.cpp
index 2242391..87a7705 100644
--- a/hwc2_device/hwc2_device.cpp
+++ b/hwc2_device/hwc2_device.cpp
@@ -244,7 +244,7 @@
       return ToHook<HWC2_PFN_VALIDATE_DISPLAY>(
           DisplayHook<decltype(&HwcDisplay::ValidateDisplay),
                       &HwcDisplay::ValidateDisplay, uint32_t *, uint32_t *>);
-#if PLATFORM_SDK_VERSION > 27
+#if __ANDROID_API__ > 27
     case HWC2::FunctionDescriptor::GetRenderIntents:
       return ToHook<HWC2_PFN_GET_RENDER_INTENTS>(
           DisplayHook<decltype(&HwcDisplay::GetRenderIntents),
@@ -255,7 +255,7 @@
           DisplayHook<decltype(&HwcDisplay::SetColorModeWithIntent),
                       &HwcDisplay::SetColorModeWithIntent, int32_t, int32_t>);
 #endif
-#if PLATFORM_SDK_VERSION > 28
+#if __ANDROID_API__ > 28
     case HWC2::FunctionDescriptor::GetDisplayIdentificationData:
       return ToHook<HWC2_PFN_GET_DISPLAY_IDENTIFICATION_DATA>(
           DisplayHook<decltype(&HwcDisplay::GetDisplayIdentificationData),
@@ -274,8 +274,8 @@
       return ToHook<HWC2_PFN_SET_DISPLAY_BRIGHTNESS>(
           DisplayHook<decltype(&HwcDisplay::SetDisplayBrightness),
                       &HwcDisplay::SetDisplayBrightness, float>);
-#endif /* PLATFORM_SDK_VERSION > 28 */
-#if PLATFORM_SDK_VERSION > 29
+#endif /* __ANDROID_API__ > 28 */
+#if __ANDROID_API__ > 29
     case HWC2::FunctionDescriptor::GetDisplayConnectionType:
       return ToHook<HWC2_PFN_GET_DISPLAY_CONNECTION_TYPE>(
           DisplayHook<decltype(&HwcDisplay::GetDisplayConnectionType),