Source/WebCore/platform/graphics/cocoa/TextTrackRepresentationCocoa.mm

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #if (PLATFORM(IOS_FAMILY) || (PLATFORM(MAC) && ENABLE(VIDEO_PRESENTATION_MODE))) && ENABLE(VIDEO_TRACK)
  29 #include "TextTrackRepresentationCocoa.h"
  30
  31 #include "FloatRect.h"
  32 #include "GraphicsContextCG.h"
  33 #include "IntRect.h"
  34
  35 #if PLATFORM(IOS_FAMILY)
  36 #include "WebCoreThread.h"
  37 #include "WebCoreThreadRun.h"
  38 #endif
  39
  40 #import <pal/spi/cocoa/QuartzCoreSPI.h>
  41
  42 using namespace WebCore;
  43
  44 @interface WebCoreTextTrackRepresentationCocoaHelper : NSObject <CALayerDelegate> {
  45     TextTrackRepresentationCocoa* _parent;
  46 }
  47 - (id)initWithParent:(TextTrackRepresentationCocoa*)parent;
  48 @property (assign) TextTrackRepresentationCocoa* parent;
  49 @end
  50
  51 @implementation WebCoreTextTrackRepresentationCocoaHelper
  52 - (id)initWithParent:(TextTrackRepresentationCocoa*)parent
  53 {
  54     if (!(self = [super init]))
  55         return nil;
  56
  57     self.parent = parent;
  58
  59     return self;
  60 }
  61
  62 - (void)dealloc
  63 {
  64     self.parent = nullptr;
  65     [super dealloc];
  66 }
  67
  68 - (void)setParent:(TextTrackRepresentationCocoa*)parent
  69 {
  70     if (_parent)
  71         [_parent->platformLayer() removeObserver:self forKeyPath:@"bounds"];
  72
  73     _parent = parent;
  74
  75     if (_parent)
  76         [_parent->platformLayer() addObserver:self forKeyPath:@"bounds" options:0 context:0];
  77 }
  78
  79 - (TextTrackRepresentationCocoa*)parent
  80 {
  81     return _parent;
  82 }
  83
  84 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
  85 {
  86     UNUSED_PARAM(change);
  87     UNUSED_PARAM(context);
  88 #if PLATFORM(IOS_FAMILY)
  89     WebThreadRun(^{
  90         if (_parent && [keyPath isEqual:@"bounds"] && object == _parent->platformLayer())
  91             _parent->client().textTrackRepresentationBoundsChanged(_parent->bounds());
  92     });
  93 #else
  94     if (_parent && [keyPath isEqual:@"bounds"] && object == _parent->platformLayer())
  95         _parent->client().textTrackRepresentationBoundsChanged(_parent->bounds());
  96 #endif
  97 }
  98
  99 - (id)actionForLayer:(CALayer *)layer forKey:(NSString *)event
 100 {
 101     UNUSED_PARAM(layer);
 102     UNUSED_PARAM(event);
 103     // Returning a NSNull from this delegate method disables all implicit CALayer actions.
 104     return [NSNull null];
 105 }
 106
 107 @end
 108
 109 std::unique_ptr<TextTrackRepresentation> TextTrackRepresentation::create(TextTrackRepresentationClient& client)
 110 {
 111     return std::make_unique<TextTrackRepresentationCocoa>(client);
 112 }
 113
 114 TextTrackRepresentationCocoa::TextTrackRepresentationCocoa(TextTrackRepresentationClient& client)
 115     : m_client(client)
 116     , m_layer(adoptNS([[CALayer alloc] init]))
 117     , m_delegate(adoptNS([[WebCoreTextTrackRepresentationCocoaHelper alloc] initWithParent:this]))
 118 {
 119     [m_layer.get() setDelegate:m_delegate.get()];
 120     [m_layer.get() setContentsGravity:kCAGravityBottom];
 121 }
 122
 123 TextTrackRepresentationCocoa::~TextTrackRepresentationCocoa()
 124 {
 125     [m_layer.get() setDelegate:nil];
 126     [m_delegate.get() setParent:nullptr];
 127 }
 128
 129 void TextTrackRepresentationCocoa::update()
 130 {
 131     if (auto representation = m_client.createTextTrackRepresentationImage())
 132         [m_layer.get() setContents:(__bridge id)representation->nativeImage().get()];
 133 }
 134
 135 void TextTrackRepresentationCocoa::setContentScale(float scale)
 136 {
 137     [m_layer.get() setContentsScale:scale];
 138 }
 139
 140 IntRect TextTrackRepresentationCocoa::bounds() const
 141 {
 142     return enclosingIntRect(FloatRect([m_layer.get() bounds]));
 143 }
 144
 145 #endif // (PLATFORM(IOS_FAMILY) || (PLATFORM(MAC) && ENABLE(VIDEO_PRESENTATION_MODE))) && ENABLE(VIDEO_TRACK)