Initial release

engine/vendor/vst3sdk/vstgui4/vstgui/lib/coffscreencontext.cpp

@@ -0,0 +1,99 @@
+// This file is part of VSTGUI. It is subject to the license terms 
+// in the LICENSE file found in the top-level directory of this
+// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE
+
+#include "coffscreencontext.h"
+#include "cframe.h"
+#include "cbitmap.h"
+#include "platform/platformfactory.h"
+#include "platform/iplatformgraphicsdevice.h"
+
+namespace VSTGUI {
+
+//-----------------------------------------------------------------------------
+COffscreenContext::COffscreenContext (CBitmap* bitmap)
+: CDrawContext (CRect (0, 0, bitmap->getWidth (), bitmap->getHeight ()))
+, bitmap (bitmap)
+{
+}
+
+//-----------------------------------------------------------------------------
+COffscreenContext::COffscreenContext (const CRect& surfaceRect)
+: CDrawContext (surfaceRect)
+{
+}
+
+//-----------------------------------------------------------------------------
+COffscreenContext::COffscreenContext (const PlatformGraphicsDeviceContextPtr device,
+									  const CRect& surfaceRect,
+									  const PlatformBitmapPtr& platformBitmap)
+: CDrawContext (device, surfaceRect, platformBitmap->getScaleFactor ())
+, bitmap (makeOwned<CBitmap> (platformBitmap))
+{
+}
+
+//-----------------------------------------------------------------------------
+void COffscreenContext::copyFrom (CDrawContext *pContext, CRect destRect, CPoint srcOffset)
+{
+	if (bitmap)
+		bitmap->draw (pContext, destRect, srcOffset);
+}
+
+#if VSTGUI_ENABLE_DEPRECATED_METHODS
+//-----------------------------------------------------------------------------
+SharedPointer<COffscreenContext> COffscreenContext::create (CFrame* frame, CCoord width, CCoord height, double scaleFactor)
+{
+	return create ({width, height}, scaleFactor);
+}
+#endif
+
+//-----------------------------------------------------------------------------
+SharedPointer<COffscreenContext> COffscreenContext::create (const CPoint& size, double scaleFactor)
+{
+	if (size.x >= 1. && size.y >= 1.)
+	{
+		if (auto graphicsDevice =
+				getPlatformFactory ().getGraphicsDeviceFactory ().getDeviceForScreen (
+					DefaultScreenIdentifier))
+		{
+			if (auto bitmap = getPlatformFactory ().createBitmap (size * scaleFactor))
+			{
+				bitmap->setScaleFactor (scaleFactor);
+				if (auto context = graphicsDevice->createBitmapContext (bitmap))
+				{
+					CRect surfaceRect (CPoint (), size * scaleFactor);
+					return makeOwned<COffscreenContext> (context, surfaceRect, bitmap);
+				}
+			}
+		}
+	}
+	return nullptr;
+}
+
+//-----------------------------------------------------------------------------
+CCoord COffscreenContext::getWidth () const
+{
+	return bitmap ? bitmap->getWidth () : 0.;
+}
+
+//-----------------------------------------------------------------------------
+CCoord COffscreenContext::getHeight () const
+{
+	return bitmap ? bitmap->getHeight () : 0.;
+}
+
+//-----------------------------------------------------------------------------
+SharedPointer<CBitmap> renderBitmapOffscreen (
+    const CPoint& size, double scaleFactor,
+    const std::function<void (CDrawContext& drawContext)> drawCallback)
+{
+	auto context = COffscreenContext::create (size, scaleFactor);
+	if (!context)
+		return nullptr;
+	context->beginDraw ();
+	drawCallback (*context);
+	context->endDraw ();
+	return shared (context->getBitmap ());
+}
+
+} // VSTGUI