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      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
     69