TabContents::~TabContents()
{
is_being_destroyed_ = true;
NotifyDisconnected();
// OnCloseStarted isn't called in unit tests.
if(!tab_close_start_time_.is_null())
{
UMA_HISTOGRAM_TIMES("Tab.Close",
base::TimeTicks::Now() - tab_close_start_time_);
}
//FOR_EACH_OBSERVER(TabContentsObserver, observers_, TabContentsDestroyed());
set_delegate(NULL);
}
// static
SkBitmap ImageOperations::ResizeBasic(const SkBitmap& source,
ResizeMethod method,
int dest_width, int dest_height,
const SkIRect& dest_subset)
{
// 确保枚举值合法.
SkASSERT(((RESIZE_FIRST_QUALITY_METHOD<=method) &&
(method<=RESIZE_LAST_QUALITY_METHOD)) ||
((RESIZE_FIRST_ALGORITHM_METHOD<=method) &&
(method<=RESIZE_LAST_ALGORITHM_METHOD)));
// 用于计算函数执行时间, 方便查看是否有问题.
base::TimeTicks resize_start = base::TimeTicks::Now();
SkIRect dest = { 0, 0, dest_width, dest_height };
DCHECK(dest.contains(dest_subset)) <<
"The supplied subset does not fall within the destination image.";
// 如果源和目的大小都是0(0*0 0*N N*0), 返回一个空位图.
if(source.width()<1 || source.height()<1 ||
dest_width<1 || dest_height<1)
{
return SkBitmap();
}
method = ResizeMethodToAlgorithmMethod(method);
// Check that we deal with an "algorithm methods" from this point onward.
SkASSERT((ImageOperations::RESIZE_FIRST_ALGORITHM_METHOD<=method) &&
(method<=ImageOperations::RESIZE_LAST_ALGORITHM_METHOD));
SkAutoLockPixels locker(source);
ResizeFilter filter(method, source.width(), source.height(),
dest_width, dest_height, dest_subset);
// Get a source bitmap encompassing this touched area. We construct the
// offsets and row strides such that it looks like a new bitmap, while
// referring to the old data.
const uint8* source_subset =
reinterpret_cast<const uint8*>(source.getPixels());
// Convolve into the result.
base::CPU cpu;
SkBitmap result;
result.setConfig(SkBitmap::kARGB_8888_Config,
dest_subset.width(), dest_subset.height());
result.allocPixels();
BGRAConvolve2D(source_subset, static_cast<int>(source.rowBytes()),
!source.isOpaque(), filter.x_filter(), filter.y_filter(),
static_cast<int>(result.rowBytes()),
static_cast<unsigned char*>(result.getPixels()),
cpu.has_sse2());
// Preserve the "opaque" flag for use as an optimization later.
result.setIsOpaque(source.isOpaque());
base::TimeDelta delta = base::TimeTicks::Now() - resize_start;
UMA_HISTOGRAM_TIMES("Image.ResampleMS", delta);
return result;
}
