app: migrate all engine access to the C ABI facade (nm U _ZN5olive = 0)

Every app module now reaches liboakengine exclusively through
oakengine_* C calls, EngineEventBridge subscriptions and app-side
handle headers (cliphandle/keyframehandle/nodevaluehandle/oakvaluehelper).
Direct C++ command construction, engine signal connect()s, and engine
type usage in MOC-visible signatures are gone: 557 -> 0 undefined
olive:: symbols in oak-editor.

app/widget/standardcombos/frameratecombobox.h

@@ -28,7 +28,7 @@
 #include <QInputDialog>
 #include <QMessageBox>
 
-#include "render/videoparams.h"
+#include "oakengine/videoparams.h"
 
 namespace olive
 {
@@ -164,17 +164,32 @@ private:
 
 		inner_->clear();
 
-		foreach (const Rational &fr, VideoParams::k_supported_frame_rates) {
-			inner_->addItem(VideoParams::frame_rate_to_string(fr),
-							QVariant::fromValue(fr));
+		{
+			const int n = oakengine_video_params_supported_frame_rate_count();
+			for (int i = 0; i < n; i++) {
+				int num, den;
+				oakengine_video_params_supported_frame_rate_at(i, &num, &den);
+				char buf[64];
+				oakengine_video_params_frame_rate_to_string(num, den, buf,
+															sizeof(buf));
+				Rational fr(num, den);
+				inner_->addItem(QString::fromUtf8(buf),
+								QVariant::fromValue(fr));
+			}
 		}
 
 		if (custom_rate_.isNull()) {
 			inner_->addItem(tr("Custom..."));
 		} else {
-			inner_->addItem(
-				tr("Custom (%1)")
-					.arg(VideoParams::frame_rate_to_string(custom_rate_)));
+			{
+				char buf[64];
+				oakengine_video_params_frame_rate_to_string(
+					custom_rate_.numerator(), custom_rate_.denominator(), buf,
+					sizeof(buf));
+				inner_->addItem(
+					tr("Custom (%1)")
+						.arg(QString::fromUtf8(buf)));
+		}
 		}
 
 		// On the first populate there is no current index (-1); select the

app/widget/standardcombos/interlacedcombobox.h

@@ -24,7 +24,7 @@
 
 #include <QComboBox>
 
-#include "render/videoparams.h"
+#include "oakengine/videoparams.h"
 
 namespace olive
 {
@@ -41,12 +41,12 @@ public:
 		this->addItem(tr("Bottom-Field First"));
 	}
 
-	VideoParams::Interlacing get_interlace_mode() const
+	int get_interlace_mode() const
 	{
-		return static_cast<VideoParams::Interlacing>(this->currentIndex());
+		return this->currentIndex();
 	}
 
-	void set_interlace_mode(VideoParams::Interlacing mode)
+	void set_interlace_mode(int mode)
 	{
 		this->setCurrentIndex(mode);
 	}

app/widget/standardcombos/pixelaspectratiocombobox.h

@@ -25,7 +25,7 @@
 #include <QComboBox>
 
 #include "dialog/ratiodialog.h"
-#include "render/videoparams.h"
+#include "oakengine/videoparams.h"
 
 namespace olive
 {
@@ -37,11 +37,16 @@ public:
 		: QComboBox(parent)
 		, dont_prompt_custom_par_(false)
 	{
-		QStringList par_names = VideoParams::get_standard_pixel_aspect_ratio_names();
-		for (int i = 0; i < VideoParams::k_standard_pixel_aspects.size(); i++) {
-			const Rational &ratio = VideoParams::k_standard_pixel_aspects.at(i);
-
-			this->addItem(par_names.at(i), QVariant::fromValue(ratio));
+		const int n = oakengine_video_params_standard_pixel_aspect_count();
+		for (int i = 0; i < n; i++) {
+			int num, den;
+			oakengine_video_params_standard_pixel_aspect_at(i, &num, &den);
+			char name_buf[256];
+			oakengine_video_params_standard_pixel_aspect_name(i, name_buf,
+															 sizeof(name_buf));
+			Rational ratio(num, den);
+			this->addItem(QString::fromUtf8(name_buf),
+						  QVariant::fromValue(ratio));
 		}
 
 		// Always add custom item last, much of the logic relies on this. Set this to the current AR so
@@ -110,9 +115,13 @@ private:
 			// Use 1:1 to prevent any real chance of the PAR being set to 0
 			this->setItemData(custom_index, QVariant::fromValue(Rational(1)));
 		} else {
-			this->setItemText(custom_index,
-							  VideoParams::format_pixel_aspect_ratio_string(
-								  tr("Custom (%1)"), ratio));
+			char buf[256];
+			oakengine_video_params_format_pixel_aspect_ratio_string(
+				"%1", ratio.numerator(), ratio.denominator(), buf,
+				sizeof(buf));
+			this->setItemText(
+				custom_index,
+				tr("Custom (%1)").arg(QString::fromUtf8(buf)));
 			this->setItemData(custom_index, QVariant::fromValue(ratio));
 		}
 	}

app/widget/standardcombos/pixelformatcombobox.h

@@ -24,7 +24,7 @@
 
 #include <QComboBox>
 
-#include "render/videoparams.h"
+#include "oakengine/videoparams.h"
 
 namespace olive
 {
@@ -35,13 +35,13 @@ public:
 	PixelFormatComboBox(bool float_only, QWidget *parent = nullptr)
 		: QComboBox(parent)
 	{
-		// Set up preview formats
-		for (int i = 0; i < PixelFormat::count; i++) {
-			PixelFormat pix_fmt = static_cast<PixelFormat::Format>(i);
-
-			if (!float_only || pix_fmt.is_float()) {
-				this->addItem(VideoParams::get_format_name(pix_fmt),
-							  static_cast<PixelFormat::Format>(pix_fmt));
+		// Set up preview formats (PixelFormat::u8=0 .. f32=4)
+		for (int i = 0; i < 5; i++) {
+			if (!float_only || oakengine_video_params_format_is_float(i)) {
+				char name_buf[64];
+				oakengine_video_params_pixel_format_name(i, name_buf,
+														 sizeof(name_buf));
+				this->addItem(QString::fromUtf8(name_buf), i);
 			}
 		}
 	}

app/widget/standardcombos/videodividercombobox.h

@@ -24,7 +24,7 @@
 
 #include <QComboBox>
 
-#include "render/videoparams.h"
+#include "oakengine/videoparams.h"
 
 namespace olive
 {
@@ -35,8 +35,12 @@ public:
 	VideoDividerComboBox(QWidget *parent = nullptr)
 		: QComboBox(parent)
 	{
-		foreach (int d, VideoParams::k_supported_dividers) {
-			this->addItem(VideoParams::get_name_for_divider(d), d);
+		const int n = oakengine_video_params_supported_divider_count();
+		for (int i = 0; i < n; i++) {
+			int d = oakengine_video_params_supported_divider_at(i);
+			char name_buf[64];
+			oakengine_video_params_divider_name(d, name_buf, sizeof(name_buf));
+			this->addItem(QString::fromUtf8(name_buf), d);
 		}
 	}