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mac-capture: Improve window capture performance

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Replaces the current implementation of Window Capture, which uses Core
Graphics to render a bitmap raster, with one that accesses the window's
CGImage bitmap directly, blits it, and hands that off as a frame to OBS
instead.

Co-Authored-By: Sebastian Beckmann <beckmann.sebastian@outlook.de>
This commit is contained in:
Dossy Shiobara 2022-05-03 17:24:46 +02:00 committed by Jim
parent ed486b00e1
commit 4405072e29
1 changed files with 12 additions and 12 deletions
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24
plugins/mac-capture/mac-window-capture.m
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@ -50,28 +50,28 @@ static inline void capture_frame(struct window_capture *wc)
size_t width = CGImageGetWidth(img);
size_t height = CGImageGetHeight(img);
CGRect rect = {{0, 0}, {width, height}};
da_resize(wc->buffer, width * height * 4);
uint8_t *data = wc->buffer.array;
if (!width || !height || CGImageGetBitsPerPixel(img) != 32 ||
CGImageGetBitsPerComponent(img) != 8) {
CGImageRelease(img);
return;
}
CGContextRef cg_context = CGBitmapContextCreate(
data, width, height, 8, width * 4, wc->color_space,
kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
CGContextSetBlendMode(cg_context, kCGBlendModeCopy);
CGContextDrawImage(cg_context, rect, img);
CGContextRelease(cg_context);
CGImageRelease(img);
CGDataProviderRef provider = CGImageGetDataProvider(img);
CFDataRef data = CGDataProviderCopyData(provider);
struct obs_source_frame frame = {
.format = VIDEO_FORMAT_BGRA,
.width = width,
.height = height,
.data[0] = data,
.linesize[0] = width * 4,
.data[0] = (uint8_t *)CFDataGetBytePtr(data),
.linesize[0] = CGImageGetBytesPerRow(img),
.timestamp = ts,
};
obs_source_output_video(wc->source, &frame);
CGImageRelease(img);
CFRelease(data);
}
static void *capture_thread(void *data)