src/views/mac/SkNSView.mm

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#import "SkNSView.h"
#include "SkCanvas.h"
#include "SkCGUtils.h"
#include "SkEvent.h"

//#define FORCE_REDRAW
@implementation SkNSView
@synthesize fWind, fTitle, fOptionsDelegate;

#if SK_SUPPORT_GPU
@synthesize fGLContext;
#endif

- (id)initWithCoder:(NSCoder*)coder {
    if ((self = [super initWithCoder:coder])) {
        self = [self initWithDefaults];
        [self setUpWindow];
    }
    return self;
}

- (id)initWithFrame:(NSRect)frameRect {
    if ((self = [super initWithFrame:frameRect])) {
        self = [self initWithDefaults];
        [self setUpWindow];
    }
    return self;
}

- (id)initWithDefaults {
    fRedrawRequestPending = false;
    fWind = NULL;
    return self;
}

- (void)setUpWindow {
    if (NULL != fWind) {
        fWind->setVisibleP(true);
        fWind->resize((int) self.frame.size.width, (int) self.frame.size.height, 
                      SkBitmap::kARGB_8888_Config);
        [self attach:SkOSWindow::kNone_BackEndType withMSAASampleCount:0];
    }
}

-(BOOL) isFlipped {
    return YES;
}

- (BOOL)acceptsFirstResponder {
    return YES;
}

- (void)resizeSkView:(NSSize)newSize {
    if (NULL != fWind && (fWind->width() != newSize.width || fWind->height() != newSize.height)) {
        fWind->resize((int) newSize.width, (int) newSize.height);
#if SK_SUPPORT_GPU
        glClear(GL_STENCIL_BUFFER_BIT);
        [fGLContext update];
#endif
    }
}

- (void) setFrameSize:(NSSize)newSize {
    [super setFrameSize:newSize];
    [self resizeSkView:newSize];
}

- (void)dealloc {
    delete fWind;
#if SK_SUPPORT_GPU
    self.fGLContext = nil;
#endif
    self.fTitle = nil;
    [super dealloc];
}

////////////////////////////////////////////////////////////////////////////////

- (void)drawSkia {
    fRedrawRequestPending = false;
    if (NULL != fWind) {
        SkCanvas canvas(fWind->getBitmap());
        fWind->draw(&canvas);
#ifdef FORCE_REDRAW
        fWind->inval(NULL);
#endif
    }
}

- (void)setSkTitle:(const char *)title {
    self.fTitle = [NSString stringWithUTF8String:title];
    [[self window] setTitle:self.fTitle];
}

- (BOOL)onHandleEvent:(const SkEvent&)evt {
    return false;
}

#include "SkOSMenu.h"
- (void)onAddMenu:(const SkOSMenu*)menu {
    [self.fOptionsDelegate view:self didAddMenu:menu];
}

- (void)onUpdateMenu:(const SkOSMenu*)menu {
    [self.fOptionsDelegate view:self didUpdateMenu:menu];
}

- (void)postInvalWithRect:(const SkIRect*)r {
    if (!fRedrawRequestPending) {
        fRedrawRequestPending = true;
        [self setNeedsDisplay:YES];
        [self performSelector:@selector(drawSkia) withObject:nil afterDelay:0];
    }
}
///////////////////////////////////////////////////////////////////////////////

#include "SkKey.h"
enum {
    SK_MacReturnKey        = 36,
    SK_MacDeleteKey        = 51,
    SK_MacEndKey        = 119,
    SK_MacLeftKey        = 123,
    SK_MacRightKey        = 124,
    SK_MacDownKey        = 125,
    SK_MacUpKey            = 126,
    SK_Mac0Key          = 0x52,
    SK_Mac1Key          = 0x53,
    SK_Mac2Key          = 0x54,
    SK_Mac3Key          = 0x55,
    SK_Mac4Key          = 0x56,
    SK_Mac5Key          = 0x57,
    SK_Mac6Key          = 0x58,
    SK_Mac7Key          = 0x59,
    SK_Mac8Key          = 0x5b,
    SK_Mac9Key          = 0x5c
};

static SkKey raw2key(UInt32 raw)
{
    static const struct {
        UInt32  fRaw;
        SkKey   fKey;
    } gKeys[] = {
        { SK_MacUpKey,      kUp_SkKey       },
        { SK_MacDownKey,    kDown_SkKey     },
        { SK_MacLeftKey,    kLeft_SkKey     },
        { SK_MacRightKey,   kRight_SkKey    },
        { SK_MacReturnKey,  kOK_SkKey       },
        { SK_MacDeleteKey,  kBack_SkKey     },
        { SK_MacEndKey,     kEnd_SkKey      },
        { SK_Mac0Key,       k0_SkKey        },
        { SK_Mac1Key,       k1_SkKey        },
        { SK_Mac2Key,       k2_SkKey        },
        { SK_Mac3Key,       k3_SkKey        },
        { SK_Mac4Key,       k4_SkKey        },
        { SK_Mac5Key,       k5_SkKey        },
        { SK_Mac6Key,       k6_SkKey        },
        { SK_Mac7Key,       k7_SkKey        },
        { SK_Mac8Key,       k8_SkKey        },
        { SK_Mac9Key,       k9_SkKey        }
    };
    
    for (unsigned i = 0; i < SK_ARRAY_COUNT(gKeys); i++)
        if (gKeys[i].fRaw == raw)
            return gKeys[i].fKey;
    return kNONE_SkKey;
}

- (void)keyDown:(NSEvent *)event {
    if (NULL == fWind)
        return;
    
    SkKey key = raw2key([event keyCode]);
    if (kNONE_SkKey != key)
        fWind->handleKey(key);
    else{
        unichar c = [[event characters] characterAtIndex:0];
        fWind->handleChar((SkUnichar)c);
    }
}

- (void)keyUp:(NSEvent *)event {
    if (NULL == fWind)
        return;
    
    SkKey key = raw2key([event keyCode]);
    if (kNONE_SkKey != key)
        fWind->handleKeyUp(key);
 // else
 //     unichar c = [[event characters] characterAtIndex:0];
}

- (void)mouseDown:(NSEvent *)event {
    NSPoint p = [event locationInWindow];
    if ([self mouse:p inRect:[self bounds]] && NULL != fWind) {
        NSPoint loc = [self convertPoint:p fromView:nil];
        fWind->handleClick((int) loc.x, (int) loc.y, SkView::Click::kDown_State, self);
    }
}

- (void)mouseDragged:(NSEvent *)event {
    NSPoint p = [event locationInWindow];
    if ([self mouse:p inRect:[self bounds]] && NULL != fWind) {
        NSPoint loc = [self convertPoint:p fromView:nil];
        fWind->handleClick((int) loc.x, (int) loc.y, SkView::Click::kMoved_State, self);
    }
}

- (void)mouseMoved:(NSEvent *)event {
    NSPoint p = [event locationInWindow];
    if ([self mouse:p inRect:[self bounds]] && NULL != fWind) {
        NSPoint loc = [self convertPoint:p fromView:nil];
        fWind->handleClick((int) loc.x, (int) loc.y, SkView::Click::kMoved_State, self);
    }
}

- (void)mouseUp:(NSEvent *)event {
    NSPoint p = [event locationInWindow];
    if ([self mouse:p inRect:[self bounds]] && NULL != fWind) {
        NSPoint loc = [self convertPoint:p fromView:nil];
        fWind->handleClick((int) loc.x, (int) loc.y, SkView::Click::kUp_State, self);
    }
}

///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include <OpenGL/OpenGL.h>
namespace { 
CGLContextObj createGLContext(int msaaSampleCount) {
    GLint major, minor;
    CGLGetVersion(&major, &minor);
    
    static const CGLPixelFormatAttribute attributes[] = {
        kCGLPFAStencilSize, (CGLPixelFormatAttribute) 8,
        kCGLPFAAccelerated,
        kCGLPFADoubleBuffer,
        (CGLPixelFormatAttribute)0
    };
    
    CGLPixelFormatObj format;
    GLint npix = 0;
    if (msaaSampleCount > 0) {
        static int kAttributeCount = SK_ARRAY_COUNT(attributes);
        CGLPixelFormatAttribute msaaAttributes[kAttributeCount + 5];
        memcpy(msaaAttributes, attributes, sizeof(attributes));
        SkASSERT(0 == msaaAttributes[kAttributeCount - 1]);
        msaaAttributes[kAttributeCount - 1] = kCGLPFASampleBuffers;
        msaaAttributes[kAttributeCount + 0] = (CGLPixelFormatAttribute)1;
        msaaAttributes[kAttributeCount + 1] = kCGLPFAMultisample;
        msaaAttributes[kAttributeCount + 2] = kCGLPFASamples;
        msaaAttributes[kAttributeCount + 3] =
                                    (CGLPixelFormatAttribute)msaaSampleCount;
        msaaAttributes[kAttributeCount + 4] = (CGLPixelFormatAttribute)0;
        CGLChoosePixelFormat(msaaAttributes, &format, &npix);
    }
    if (!npix) {
        CGLChoosePixelFormat(attributes, &format, &npix);
    }
    
    CGLContextObj ctx;
    CGLCreateContext(format, NULL, &ctx);
    CGLDestroyPixelFormat(format);
    
    static const GLint interval = 1;
    CGLSetParameter(ctx, kCGLCPSwapInterval, &interval);
    CGLSetCurrentContext(ctx);
    return ctx;
}
}
#endif

- (void)viewDidMoveToWindow {
    [super viewDidMoveToWindow];
    
#if SK_SUPPORT_GPU
    //Attaching view to fGLContext requires that the view to be part of a window,
    //and that the NSWindow instance must have a CoreGraphics counterpart (or 
    //it must NOT be deferred or should have been on screen at least once)
    if ([fGLContext view] != self && nil != self.window) {
        [fGLContext setView:self];
    }
#endif
}
- (bool)attach:(SkOSWindow::SkBackEndTypes)attachType withMSAASampleCount:(int) sampleCount {
#if SK_SUPPORT_GPU
    if (SkOSWindow::kNativeGL_BackEndType == attachType) {
        [self setWantsLayer:NO];
        self.layer = nil;
        if (nil == fGLContext) {
            CGLContextObj ctx = createGLContext(sampleCount);
            fGLContext = [[NSOpenGLContext alloc] initWithCGLContextObj:ctx];
            CGLReleaseContext(ctx);
            if (NULL == fGLContext) {
                return false;
            }
            [fGLContext setView:self];
        }
        
        [fGLContext makeCurrentContext];
        
        glViewport(0, 0, (int) self.bounds.size.width, (int) self.bounds.size.width);
        glClearColor(0, 0, 0, 0);
        glClearStencil(0);
        glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        return true;
    }
#endif
    if (SkOSWindow::kNone_BackEndType == attachType) {
        [self detach];
        [self setLayer:[CALayer layer]];
        [self setWantsLayer:YES];
        return true;
    }
    return false;
}

- (void)detach {
#if SK_SUPPORT_GPU
    [fGLContext release];
    fGLContext = nil;
#endif
}

#include "SkCGUtils.h"

- (void)present {
#if SK_SUPPORT_GPU
    if (nil != fGLContext) {
        [fGLContext flushBuffer];
        return;
    }
#endif
    const SkBitmap& bmp = fWind->getBitmap();
    SkASSERT(self.layer);
    // FIXME: This causes the layer to flicker during animation. Making a copy of the CGImage does
    // not help.
    CGImageRef img = SkCreateCGImageRef(bmp);
    self.layer.contents = (id) img;
    CGImageRelease(img);
}
@end