[GStreamer] Support Dolby Vision codecs

Some applications (like AppleTV+) explicitly checks MSE for DV codecs support
and select proper stream based on that. Browser needs to report that
Dolby vision codecs are supported.

List 'dvhe' and 'dvh1' codecs in GStreamer registry scanner
but make sure they are exposed only if platform screen supports HDR.

WPEPlatform provides screen properties throuhg ScreenManager.
When disabled, use fake screen properties with HDR support based on page settings.

For WPE port only.

Author: asurdej-comcast

Source/WebCore/platform/PlatformScreen.cpp

@@ -26,7 +26,7 @@
 #include "config.h"
 #include "PlatformScreen.h"
 
-#if PLATFORM(COCOA) || PLATFORM(GTK) || (PLATFORM(WPE) && ENABLE(WPE_PLATFORM))
+#if PLATFORM(COCOA) || PLATFORM(GTK) || PLATFORM(WPE)
 
 #include "ScreenProperties.h"
 #include <wtf/NeverDestroyed.h>

Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.cpp

@@ -42,6 +42,11 @@
 #include "VideoEncoderPrivateGStreamer.h"
 #endif
 
+#if PLATFORM(WPE)
+#include "PlatformScreen.h"
+#include "ScreenProperties.h"
+#endif // PLATFORM(WPE)
+
 namespace {
 struct VideoDecodingLimits {
     unsigned mediaMaxWidth = 0;
@@ -510,6 +515,10 @@ void GStreamerRegistryScanner::initializeDecoders(const GStreamerRegistryScanner
         m_decoderCodecMap.add("x-h265"_s, h265DecoderAvailable);
         m_decoderCodecMap.add("hvc1*"_s, h265DecoderAvailable);
         m_decoderCodecMap.add("hev1*"_s, h265DecoderAvailable);
+#if PLATFORM(WPE)
+        m_decoderCodecMap.add("dvhe*"_s, h265DecoderAvailable);
+        m_decoderCodecMap.add("dvh1*"_s, h265DecoderAvailable);
+#endif // PLATFORM(WPE)
     }
 
     if (shouldAddMP4Container) {
@@ -747,11 +756,22 @@ GStreamerRegistryScanner::CodecLookupResult GStreamerRegistryScanner::isCodecSup
     String subType = slashIndex != notFound ? codec.substring(slashIndex + 1) : codec;
     auto codecName = caseSensitive == CaseSensitiveCodecName::Yes ? subType : subType.convertToASCIILowercase();
 
+#if PLATFORM(WPE)
+    bool supportsDVHCodec = false;
+    auto* scrData = screenData(primaryScreenDisplayID());
+    if (scrData && scrData->screenSupportsHighDynamicRange)
+        supportsDVHCodec = true;
+#endif // PLATFORM(WPE)
+
     CodecLookupResult result;
     if (codecName.startsWith("avc1"_s))
         result = isAVC1CodecSupported(configuration, codecName, shouldCheckForHardwareUse);
     else if (codecName.startsWith("hev1"_s) || codecName.startsWith("hvc1"_s))
         result = isHEVCCodecSupported(configuration, codecName, shouldCheckForHardwareUse);
+#if PLATFORM(WPE)
+    else if ((codecName.startsWith("dvhe"_s) || codecName.startsWith("dvh1"_s)) && !supportsDVHCodec)
+        result = { false, nullptr };
+#endif // PLATFORM(WPE)
     else {
         auto& codecMap = configuration == Configuration::Decoding ? m_decoderCodecMap : m_encoderCodecMap;
         for (const auto& [codecId, lookupResult] : codecMap) {

Source/WebKit/WebProcess/WebPage/WebPage.cpp

@@ -463,6 +463,11 @@
 #include <pal/cf/CoreTextSoftLink.h>
 #endif
 
+#if PLATFORM(WPE) && !ENABLE(WPE_PLATFORM)
+#include <WebCore/PlatformScreen.h>
+#include <WebCore/ScreenProperties.h>
+#endif // PLATFORM(WPE) && !ENABLE(WPE_PLATFORM)
+
 namespace WebKit {
 using namespace JSC;
 using namespace WebCore;
@@ -4813,6 +4818,20 @@ void WebPage::updatePreferences(const WebPreferencesStore& store)
 #endif
 
     m_page->settingsDidChange();
+
+#if PLATFORM(WPE) && !ENABLE(WPE_PLATFORM)
+    // On WPE, we don't have a way to get screen properties from the system, so
+    // we fake them here based on the settings.
+    auto* currentScreenData = WebCore::screenData(primaryScreenDisplayID());
+    if (!currentScreenData || currentScreenData->screenSupportsHighDynamicRange != settings.screenSupportsHDR()) {
+        WebCore::ScreenData data;
+        data.screenSupportsHighDynamicRange = settings.screenSupportsHDR();
+        WebCore::ScreenProperties props;
+        props.primaryDisplayID = 1; // Fake display ID
+        props.screenDataMap.add(props.primaryDisplayID, WTFMove(data));
+        WebCore::setScreenProperties(props);
+    }
+#endif // PLATFORM(WPE) && !ENABLE(WPE_PLATFORM
 }
 
 #if ENABLE(DATA_DETECTION)