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Adds minor exposition.

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This commit is contained in:
Thomas Harte 2020-09-14 20:39:52 -04:00
parent c0c7818d5d
commit 8557bb2136
1 changed files with 4 additions and 0 deletions
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4
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
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@ -1164,6 +1164,10 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
// Set alpha to fully opaque and do some byte shuffling if necessary; // Set alpha to fully opaque and do some byte shuffling if necessary;
// Apple likes BGR for output but RGB is the best I can specify to NSBitmapImageRep. // Apple likes BGR for output but RGB is the best I can specify to NSBitmapImageRep.
//
// I'm not putting my foot down and having the GPU do the conversion I want
// because this lets me reuse _copyPipeline and thereby cut down on boilerplate,
// especially given that screenshots are not a bottleneck.
const NSUInteger totalBytes = _frameBuffer.width * _frameBuffer.height * 4; const NSUInteger totalBytes = _frameBuffer.width * _frameBuffer.height * 4;
const bool flipRedBlue = _view.colorPixelFormat == MTLPixelFormatBGRA8Unorm; const bool flipRedBlue = _view.colorPixelFormat == MTLPixelFormatBGRA8Unorm;
for(NSUInteger offset = 0; offset < totalBytes; offset += 4) { for(NSUInteger offset = 0; offset < totalBytes; offset += 4) {