MetalWindowContext_mac.mm

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/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#include "tools/window/MetalWindowContext.h"
#include "tools/window/mac/WindowContextFactory_mac.h"
 
#import <Cocoa/Cocoa.h>
#import <QuartzCore/CAConstraintLayoutManager.h>
 
using skwindow::DisplayParams;
using skwindow::MacWindowInfo;
using skwindow::internal::MetalWindowContext;
 
namespace {
 
class MetalWindowContext_mac : public MetalWindowContext {
public:
    MetalWindowContext_mac(const MacWindowInfo&, const DisplayParams&);
 
    ~MetalWindowContext_mac() override;
 
    bool onInitializeContext() override;
    void onDestroyContext() override;
 
    void resize(int w, int h) override;
 
private:
    NSView*              fMainView;
};
 
MetalWindowContext_mac::MetalWindowContext_mac(const MacWindowInfo& info,
                                               const DisplayParams& params)
    : MetalWindowContext(params)
    , fMainView(info.fMainView) {
 
    // any config code here (particularly for msaa)?
 
    this->initializeContext();
}
 
MetalWindowContext_mac::~MetalWindowContext_mac() {
    this->destroyContext();
}
 
bool MetalWindowContext_mac::onInitializeContext() {
    SkASSERT(nil != fMainView);
 
    fMetalLayer = [CAMetalLayer layer];
    fMetalLayer.device = fDevice.get();
    fMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
 
    // resize ignores the passed values and uses the fMainView directly.
    this->resize(0, 0);
 
    BOOL useVsync = fDisplayParams.fDisableVsync ? NO : YES;
    fMetalLayer.displaySyncEnabled = useVsync;  // TODO: need solution for 10.12 or lower
    fMetalLayer.layoutManager = [CAConstraintLayoutManager layoutManager];
    fMetalLayer.autoresizingMask = kCALayerHeightSizable | kCALayerWidthSizable;
    fMetalLayer.contentsGravity = kCAGravityTopLeft;
    fMetalLayer.magnificationFilter = kCAFilterNearest;
    NSColorSpace* cs = fMainView.window.colorSpace;
    fMetalLayer.colorspace = cs.CGColorSpace;
 
    fMainView.layer = fMetalLayer;
    fMainView.wantsLayer = YES;
 
    return true;
}
 
void MetalWindowContext_mac::onDestroyContext() {}
 
void MetalWindowContext_mac::resize(int w, int h) {
    CGFloat backingScaleFactor = skwindow::GetBackingScaleFactor(fMainView);
    CGSize backingSize = fMainView.bounds.size;
    backingSize.width *= backingScaleFactor;
    backingSize.height *= backingScaleFactor;
 
    fMetalLayer.drawableSize = backingSize;
    fMetalLayer.contentsScale = backingScaleFactor;
 
    fWidth = backingSize.width;
    fHeight = backingSize.height;
}
 
}  // anonymous namespace
 
namespace skwindow {
 
std::unique_ptr<WindowContext> MakeMetalForMac(const MacWindowInfo& info,
                                               const DisplayParams& params) {
    std::unique_ptr<WindowContext> ctx(new MetalWindowContext_mac(info, params));
    if (!ctx->isValid()) {
        return nullptr;
    }
    return ctx;
}
 
}  // namespace skwindow