MetalWindowContext_ios.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/ios/WindowContextFactory_ios.h"
 
#import <Metal/Metal.h>
#import <UIKit/UIKit.h>
 
using skwindow::DisplayParams;
using skwindow::IOSWindowInfo;
using skwindow::internal::MetalWindowContext;
 
@interface MetalView : MainView
@end
 
@implementation MetalView
+ (Class) layerClass {
    return [CAMetalLayer class];
}
@end
 
namespace {
 
class MetalWindowContext_ios : public MetalWindowContext {
public:
    MetalWindowContext_ios(const IOSWindowInfo&, const DisplayParams&);
 
    ~MetalWindowContext_ios() override;
 
    bool onInitializeContext() override;
    void onDestroyContext() override;
 
    void resize(int w, int h) override;
 
private:
    sk_app::Window_ios*  fWindow;
    UIViewController*    fViewController;
    MetalView*           fMetalView;
};
 
MetalWindowContext_ios::MetalWindowContext_ios(const IOSWindowInfo& info,
                                               const DisplayParams& params)
    : MetalWindowContext(params)
    , fWindow(info.fWindow)
    , fViewController(info.fViewController) {
 
    // iOS test apps currently ignore MSAA settings.
 
    this->initializeContext();
}
 
MetalWindowContext_ios::~MetalWindowContext_ios() {
    this->destroyContext();
    [fMetalView removeFromSuperview];
    [fMetalView release];
}
 
bool MetalWindowContext_ios::onInitializeContext() {
    SkASSERT(fWindow != nil);
    SkASSERT(fViewController != nil);
 
    CGRect frameRect = [fViewController.view frame];
    fMetalView = [[[MetalView alloc] initWithFrame:frameRect] initWithWindow:fWindow];
    [fViewController.view addSubview:fMetalView];
 
    fMetalLayer = (CAMetalLayer*)fMetalView.layer;
    fMetalLayer.device = fDevice.get();
    fMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
    fMetalLayer.drawableSize = frameRect.size;
    fMetalLayer.frame = frameRect;
 
    fMetalLayer.contentsGravity = kCAGravityTopLeft;
 
    fWidth = frameRect.size.width;
    fHeight = frameRect.size.height;
 
    return true;
}
 
void MetalWindowContext_ios::onDestroyContext() {}
 
void MetalWindowContext_ios::resize(int w, int h) {
    fMetalLayer.drawableSize = fMetalView.frame.size;
    fMetalLayer.frame = fMetalView.frame;
    fWidth = w;
    fHeight = h;
}
 
}  // anonymous namespace
 
namespace skwindow {
 
std::unique_ptr<WindowContext> MakeMetalForIOS(const IOSWindowInfo& info,
                                               const DisplayParams& params) {
    std::unique_ptr<WindowContext> ctx(new MetalWindowContext_ios(info, params));
    if (!ctx->isValid()) {
        return nullptr;
    }
    return ctx;
}
 
}  // namespace skwindow