private void RenderItem(IntPtr data, uint cx, uint cy)
{
bool sourceIsInitialized = _source.Width != 0 || _source.Height != 0;
if (!sourceIsInitialized)
{
if (_loadingMessage == null)
{
Store.Data.Webcam.Window.Dispatcher.Invoke(new Action(AddLoadingMessage));
}
}
else
{
if (_loadingMessage != null)
{
Store.Data.Webcam.Window.Dispatcher.Invoke(new Action(RemoveLoadingMessage));
}
}
int newW = (int)cx;
int newH = (int)cy;
int itemWidth = (int)_item.Width;
int itemHeight = (int)_item.Height;
int itemSourceWidth = (int)_source.Width;
int itemSourceHeight = (int)_source.Height;
float previewAspect = (float)cx / cy;
float itemAspect = (float)itemWidth / itemHeight;
float sourceAspect = (float)itemSourceWidth / itemSourceHeight;
//calculate new width and height for item to make it fit inside the preview area
if (previewAspect > itemAspect)
{
newW = (int)(cy * itemAspect);
}
else
{
newH = (int)(cx / itemAspect);
}
int centerX = ((int)cx - newW) / 2;
int centerY = ((int)cy - newH) / 2;
GS.ViewportPush();
GS.ProjectionPush();
float difWidth = itemAspect < sourceAspect ? (itemSourceWidth - (itemSourceHeight * itemAspect)) / 2.0f : 0.0f;
float difHeight = itemAspect < sourceAspect ? 0.0f : (itemSourceHeight - (itemSourceWidth / itemAspect)) / 2.0f;
//setup orthographic projection of the item
GS.Ortho(difWidth, itemSourceWidth - difWidth, difHeight, itemSourceHeight - difHeight, -100.0f, 100.0f);
GS.SetViewport(centerX, centerY, newW, newH);
//render item content
_source.Render();
GS.ProjectionPop();
GS.ViewportPop();
GS.LoadVertexBuffer(null);
}
private void RenderSource(IntPtr data, uint cx, uint cy)
{
int newW = (int)cx;
int newH = (int)cy;
int sourceWidth = (int)source.Width;
int sourceHeight = (int)source.Height;
float previewAspect = (float)cx / cy;
float sourceAspect = (float)sourceWidth / sourceHeight;
//calculate new width and height for source to make it fit inside the preview area
if (previewAspect > sourceAspect)
{
newW = (int)(cy * sourceAspect);
}
else
{
newH = (int)(cx / sourceAspect);
}
int centerX = ((int)cx - newW) / 2;
int centerY = ((int)cy - newH) / 2;
GS.ViewportPush();
GS.ProjectionPush();
//setup orthographic projection of the source
GS.Ortho(0.0f, sourceWidth, 0.0f, sourceHeight, -100.0f, 100.0f);
GS.SetViewport(centerX, centerY, newW, newH);
//render source content
source.Render();
GS.ProjectionPop();
GS.ViewportPop();
GS.LoadVertexBuffer(null);
}