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Use CGIMAGEREF as drawing strategy, and update comments explaining why

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This commit is contained in:
nigel 2003-03-21 06:14:22 +00:00
parent b48a5a3253
commit dea9029450
1 changed files with 5 additions and 15 deletions
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20
BasiliskII/src/MacOSX/video_macosx.h
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@ -23,23 +23,13 @@
#import <video.h>
/* Set the strategy for drawing the bitmap in the Mac OS X window */
#define CGDRAWBITMAP
//#define CGIMAGEREF
//#define CGDRAWBITMAP
#define CGIMAGEREF
//#define NSBITMAP
// The frames-per-second benchmark function on my machine does roughly:
//
// OS: 10.1.5 10.2.2
// CGDRAWBITMAP 15.2 36.6
// CGIMAGEREF 15.0 27-135(i)
// NSBITMAP 15.1 26.9
//
// (i) This seems to vary wildly between different builds on the same machine.
// I don't know why, but I definately don't trust it. Recently I noticed
// that it also varies by alpha channel strategy:
// kCGImageAlphaNone 36.6fps
// kCGImageAlphaPremultipliedFirst 112fps
// kCGImageAlphaNoneSkipFirst 135fps
// Using Core Graphics is fastest when rendering 32bit data. Rendering CGImageRefs
// allows us to use all the bitmaps that BasiliskII supports. When both Basilisk II
// and OS X are set to 'Thousands', it can achieve over 500fps in a 312x342 window!
/* When the BasiliskII video driver respects the alpha bits, set this to let us use */
/* kCGImageAlphaPremultipliedFirst, and to have nice rounded corners on the screen. */