Source/WebKitLegacy/mac/WebView/WebWindowAnimation.mm

/*
 * Copyright (C) 2009-2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#if PLATFORM(MAC)

#import "WebWindowAnimation.h"

#import <WebCore/FloatConversion.h>
#import <pal/spi/cg/CoreGraphicsSPI.h>
#import <wtf/Assertions.h>
#import <wtf/MathExtras.h>

static const CGFloat slowMotionFactor = 10;

static NSTimeInterval WebWindowAnimationDurationFromDuration(NSTimeInterval duration)
{
    return ([[NSApp currentEvent] modifierFlags] & NSEventModifierFlagShift) ? duration * slowMotionFactor : duration;
}

static NSRect scaledRect(NSRect _initialFrame, NSRect _finalFrame, CGFloat factor)
{
    NSRect currentRect = _initialFrame;
    currentRect.origin.x += (NSMinX(_finalFrame) - NSMinX(_initialFrame)) * factor;
    currentRect.origin.y += (NSMinY(_finalFrame) - NSMinY(_initialFrame)) * factor;
    currentRect.size.width += (NSWidth(_finalFrame) - NSWidth(_initialFrame)) * factor;
    currentRect.size.height += (NSHeight(_finalFrame) - NSHeight(_initialFrame)) * factor;
    return currentRect;
}

static CGFloat squaredDistance(NSPoint point1, NSPoint point2)
{
    CGFloat deltaX = point1.x - point2.x;
    CGFloat deltaY = point1.y - point2.y;
    return deltaX * deltaX + deltaY * deltaY;
}

using WebCore::narrowPrecisionToFloat;

@implementation WebWindowScaleAnimation

- (id)init
{
    self = [super init];
    if (!self)
        return nil;
    [self setAnimationBlockingMode:NSAnimationNonblockingThreaded];
    [self setFrameRate:60];
    return self;
}

- (id)initWithHintedDuration:(NSTimeInterval)duration window:(NSWindow *)window initalFrame:(NSRect)initialFrame finalFrame:(NSRect)finalFrame
{
    self = [self init];
    if (!self)
        return nil;
    _hintedDuration = duration;
    _window = window;
    _initialFrame = initialFrame;
    _finalFrame = finalFrame;
    _realFrame = [window frame];
    return self;
}

- (void) dealloc
{
    [_subAnimation release];
    [super dealloc];
}

- (void)setDuration:(NSTimeInterval)duration
{
    [super setDuration:WebWindowAnimationDurationFromDuration(duration)];
}

- (void)setWindow:(NSWindow *)window
{
    _window = window;
}

- (float)currentValue
{
    return narrowPrecisionToFloat(0.5 - 0.5 * cos(piDouble * (1 - [self currentProgress])));
}

- (NSRect)currentFrame
{
    return scaledRect(_finalFrame, _initialFrame, [self currentValue]);
}

static void flipRect(NSRect* rect)
{
    rect->origin.y = NSMaxY([(NSScreen *)[[NSScreen screens] objectAtIndex:0] frame]) - NSMaxY(*rect);
}

static CGSConnectionID mainWindowServerConnectionID()
{
    static CGSConnectionID cgsId;
    if (!cgsId)
        cgsId = CGSMainConnectionID();
    return cgsId;
}

static void setScaledFrameForWindow(NSWindow *window, NSRect scaleFrame, NSRect nonScaledFrame)
{
    if (NSEqualRects(scaleFrame, nonScaledFrame)) {
        IGNORE_NULL_CHECK_WARNINGS_BEGIN
        CGSSetWindowWarp(mainWindowServerConnectionID(), window.windowNumber, 0, 0, nullptr);
        IGNORE_NULL_CHECK_WARNINGS_END
        return;
    }
    
    float mesh[16];
    
    flipRect(&scaleFrame);
    flipRect(&nonScaledFrame);
    
    // top-left point (to and from)
    mesh[0] = 0;
    mesh[1] = 0;
    mesh[2] = NSMinX(scaleFrame);
    mesh[3] = NSMinY(scaleFrame);
    
    // top-right point (to and from)
    mesh[4] = NSWidth(nonScaledFrame);
    mesh[5] = 0;
    mesh[6] = NSMaxX(scaleFrame);
    mesh[7] = NSMinY(scaleFrame);
    
    // bottom-left (to and from)
    mesh[8] = 0;
    mesh[9] = NSHeight(nonScaledFrame);
    mesh[10] = NSMinX(scaleFrame);
    mesh[11] = NSMaxY(scaleFrame);
    
    // bottom-right (to and from)
    mesh[12] = NSWidth(nonScaledFrame);
    mesh[13] = NSHeight(nonScaledFrame);
    mesh[14] = NSMaxX(scaleFrame);
    mesh[15] = NSMaxY(scaleFrame);
    
    // Apply the warp.
    CGSSetWindowWarp(mainWindowServerConnectionID(), window.windowNumber, 2, 2, mesh);
}

- (void)setCurrentProgress:(NSAnimationProgress)progress
{
    if (!_window)
        return;

    [super setCurrentProgress:progress];

    NSRect currentRect = [self currentFrame];
    setScaledFrameForWindow(_window, currentRect, _realFrame);
    [_subAnimation setCurrentProgress:progress];
}

- (void)setSubAnimation:(NSAnimation *)animation
{
    id oldAnimation = _subAnimation;
    _subAnimation = [animation retain];
    [oldAnimation release];
}

- (NSTimeInterval)additionalDurationNeededToReachFinalFrame
{
    static const CGFloat maxAdditionalDuration = 1;
    static const CGFloat speedFactor = 0.0001f;
    
    CGFloat maxDist = squaredDistance(_initialFrame.origin, _finalFrame.origin);
    CGFloat dist;
    
    dist = squaredDistance(NSMakePoint(NSMaxX(_initialFrame), NSMinY(_initialFrame)), NSMakePoint(NSMaxX(_finalFrame), NSMinY(_finalFrame)));
    if (dist > maxDist)
        maxDist = dist;
    
    dist = squaredDistance(NSMakePoint(NSMaxX(_initialFrame), NSMaxY(_initialFrame)), NSMakePoint(NSMaxX(_finalFrame), NSMaxY(_finalFrame)));
    if (dist > maxDist)
        maxDist = dist;
    
    dist = squaredDistance(NSMakePoint(NSMinX(_initialFrame), NSMinY(_initialFrame)), NSMakePoint(NSMinX(_finalFrame), NSMinY(_finalFrame)));
    if (dist > maxDist)
        maxDist = dist;
    
    return std::min(static_cast<CGFloat>(sqrt(maxDist) * speedFactor), maxAdditionalDuration);
}

- (void)startAnimation
{
    // Compute extra time
    if (_hintedDuration)
        [self setDuration:_hintedDuration + [self additionalDurationNeededToReachFinalFrame]];
    [super startAnimation];
}

- (void)stopAnimation
{
    _window = nil;
    [super stopAnimation];
    [_subAnimation stopAnimation];
}

@end

@implementation WebWindowFadeAnimation

- (id)init
{
    self = [super init];
    if (!self)
        return nil;
    [self setAnimationBlockingMode:NSAnimationNonblockingThreaded];
    [self setFrameRate:60];
    [self setAnimationCurve:NSAnimationEaseInOut];
    return self;
}

- (id)initWithDuration:(NSTimeInterval)duration window:(NSWindow *)window initialAlpha:(CGFloat)initialAlpha finalAlpha:(CGFloat)finalAlpha
{
    self = [self init];
    if (!self)
        return nil;    
    _window = window;
    _initialAlpha = initialAlpha;
    _finalAlpha = finalAlpha;
    [self setDuration:duration];
    return self;
}

- (void)setDuration:(NSTimeInterval)duration
{
    [super setDuration:WebWindowAnimationDurationFromDuration(duration)];
}

- (CGFloat)currentAlpha
{
    return std::max(static_cast<CGFloat>(0), std::min(static_cast<CGFloat>(1), _initialAlpha + [self currentValue] * (_finalAlpha - _initialAlpha)));
}

- (void)setCurrentProgress:(NSAnimationProgress)progress
{
    if (_isStopped)
        return;

    ASSERT(_window);
    [super setCurrentProgress:progress];

    CGSSetWindowAlpha(mainWindowServerConnectionID(), _window.windowNumber, self.currentAlpha);
}

- (void)setWindow:(NSWindow*)window
{
    _window = window;
}

- (void)stopAnimation
{
    // This is relevant when we are a sub animation of a scale animation.
    // In this case we are hosted in the animated thread of the parent
    // and even after [super stopAnimation], the parent might call
    // setCurrrentProgress.
    _isStopped = YES;

    [super stopAnimation];
}

@end

#endif // PLATFORM(MAC)