content/browser/compositor/software_layer_mac.mm

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/compositor/software_layer_mac.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "base/mac/mac_util.h"
   9 #include "base/mac/scoped_cftyperef.h"
  10 #include "base/mac/sdk_forward_declarations.h"
  11 #include "ui/base/cocoa/animation_utils.h"
  12
  13 @implementation SoftwareLayer
  14
  15 - (id)init {
  16   if (self = [super init]) {
  17     [self setBackgroundColor:CGColorGetConstantColor(kCGColorWhite)];
  18     [self setAnchorPoint:CGPointMake(0, 0)];
  19     // Setting contents gravity is necessary to prevent the layer from being
  20     // scaled during dyanmic resizes (especially with devtools open).
  21     [self setContentsGravity:kCAGravityTopLeft];
  22   }
  23   return self;
  24 }
  25
  26 - (void)setContentsToData:(const void *)data
  27              withRowBytes:(size_t)rowBytes
  28             withPixelSize:(gfx::Size)pixelSize
  29           withScaleFactor:(float)scaleFactor {
  30   TRACE_EVENT0("browser", "-[SoftwareLayer setContentsToData]");
  31
  32   // Disable animating the contents change or the scale factor change.
  33   ScopedCAActionDisabler disabler;
  34
  35   // Set the contents of the software CALayer to be a CGImage with the provided
  36   // pixel data. Make a copy of the data before backing the image with them,
  37   // because the same buffer will be reused for the next frame.
  38   base::ScopedCFTypeRef<CFDataRef> dataCopy(
  39       CFDataCreate(NULL,
  40                    static_cast<const UInt8 *>(data),
  41                    rowBytes * pixelSize.height()));
  42   base::ScopedCFTypeRef<CGDataProviderRef> dataProvider(
  43       CGDataProviderCreateWithCFData(dataCopy));
  44   base::ScopedCFTypeRef<CGImageRef> image(
  45       CGImageCreate(pixelSize.width(),
  46                     pixelSize.height(),
  47                     8,
  48                     32,
  49                     rowBytes,
  50                     base::mac::GetSystemColorSpace(),
  51                     kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host,
  52                     dataProvider,
  53                     NULL,
  54                     false,
  55                     kCGRenderingIntentDefault));
  56   [self setContents:(id)image.get()];
  57   [self setBounds:CGRectMake(
  58       0, 0, pixelSize.width() / scaleFactor, pixelSize.height() / scaleFactor)];
  59
  60   // Set the contents scale of the software CALayer.
  61   if ([self respondsToSelector:(@selector(contentsScale))] &&
  62       [self respondsToSelector:(@selector(setContentsScale:))] &&
  63       [self contentsScale] != scaleFactor) {
  64     [self setContentsScale:scaleFactor];
  65   }
  66 }
  67
  68 @end