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Bug 1128223 (Part 2) - Add FLAG_SYNC_DECODE_IF_FAST. r=tn

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This commit is contained in:
Seth Fowler 2015-02-02 21:40:35 -08:00
parent 564caf69e7
commit 6a678ed5a6
2 changed files with 29 additions and 23 deletions
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18
image/public/imgIContainer.idl
View File

@ -69,7 +69,7 @@ native nsIntSizeByVal(nsIntSize);
*
* Internally, imgIContainer also manages animation of images.
*/
[scriptable, builtinclass, uuid(25236a61-9568-4b2b-a2ce-209a2db9771d)]
[scriptable, builtinclass, uuid(60e07aae-8500-46c7-b305-9a35ad7e6665)]
interface imgIContainer : nsISupports
{
/**
@ -151,6 +151,9 @@ interface imgIContainer : nsISupports
* FLAG_SYNC_DECODE: Forces synchronous/non-progressive decode of all
* available data before the call returns.
*
* FLAG_SYNC_DECODE_IF_FAST: Like FLAG_SYNC_DECODE, but requests a sync decode
* be performed only if ImageLib estimates it can be completed very quickly.
*
* FLAG_DECODE_NO_PREMULTIPLY_ALPHA: Do not premultiply alpha if
* it's not already premultiplied in the image data.
*
@ -177,12 +180,13 @@ interface imgIContainer : nsISupports
*/
const unsigned long FLAG_NONE = 0x0;
const unsigned long FLAG_SYNC_DECODE = 0x1;
const unsigned long FLAG_DECODE_NO_PREMULTIPLY_ALPHA = 0x2;
const unsigned long FLAG_DECODE_NO_COLORSPACE_CONVERSION = 0x4;
const unsigned long FLAG_CLAMP = 0x8;
const unsigned long FLAG_HIGH_QUALITY_SCALING = 0x10;
const unsigned long FLAG_WANT_DATA_SURFACE = 0x20;
const unsigned long FLAG_BYPASS_SURFACE_CACHE = 0x40;
const unsigned long FLAG_SYNC_DECODE_IF_FAST = 0x2;
const unsigned long FLAG_DECODE_NO_PREMULTIPLY_ALPHA = 0x4;
const unsigned long FLAG_DECODE_NO_COLORSPACE_CONVERSION = 0x8;
const unsigned long FLAG_CLAMP = 0x10;
const unsigned long FLAG_HIGH_QUALITY_SCALING = 0x20;
const unsigned long FLAG_WANT_DATA_SURFACE = 0x40;
const unsigned long FLAG_BYPASS_SURFACE_CACHE = 0x80;
/**
* A constant specifying the default set of decode flags (i.e., the default

34
image/src/RasterImage.cpp
View File

@ -1420,23 +1420,18 @@ RasterImage::WantDecodedFrames(const nsIntSize& aSize, uint32_t aFlags,
SurfaceCache::UnlockSurfaces(ImageKey(this));
}
DecodeStrategy strategy = DecodeStrategy::ASYNC;
if (aShouldSyncNotify) {
// We can sync notify, which means we can also sync decode.
if (aFlags & FLAG_SYNC_DECODE) {
Decode(DecodeStrategy::SYNC_IF_POSSIBLE, Some(aSize), aFlags);
return;
strategy = DecodeStrategy::SYNC_IF_POSSIBLE;
} else if (aFlags & FLAG_SYNC_DECODE_IF_FAST) {
strategy = DecodeStrategy::SYNC_FOR_SMALL_IMAGES;
}
// Here we are explicitly trading off flashing for responsiveness in the
// case that we're redecoding an image (see bug 845147).
Decode(mHasBeenDecoded ? DecodeStrategy::ASYNC
: DecodeStrategy::SYNC_FOR_SMALL_IMAGES,
Some(aSize), aFlags);
return;
}
// We can't sync notify, so do an async decode.
Decode(DecodeStrategy::ASYNC, Some(aSize), aFlags);
Decode(strategy, Some(aSize), aFlags);
}
//******************************************************************************
@ -1466,7 +1461,7 @@ RasterImage::StartDecoding()
return NS_OK;
}
return RequestDecodeForSize(mSize, FLAG_SYNC_DECODE);
return RequestDecodeForSize(mSize, FLAG_SYNC_DECODE_IF_FAST);
}
NS_IMETHODIMP
@ -1487,8 +1482,15 @@ RasterImage::RequestDecodeForSize(const nsIntSize& aSize, uint32_t aFlags)
// downscale-during-decode.
nsIntSize targetSize = mDownscaleDuringDecode ? aSize : mSize;
// Sync decode small images if requested.
bool shouldSyncDecodeSmallImages = aFlags & FLAG_SYNC_DECODE;
// Decide whether to sync decode images we can decode quickly. Here we are
// explicitly trading off flashing for responsiveness in the case that we're
// redecoding an image (see bug 845147).
bool shouldSyncDecodeIfFast =
!mHasBeenDecoded && (aFlags & FLAG_SYNC_DECODE_IF_FAST);
uint32_t flags = shouldSyncDecodeIfFast
? aFlags
: aFlags & ~FLAG_SYNC_DECODE_IF_FAST;
// Look up the first frame of the image, which will implicitly start decoding
// if it's not available right now.
@ -1496,8 +1498,8 @@ RasterImage::RequestDecodeForSize(const nsIntSize& aSize, uint32_t aFlags)
// synchronously decoding small images, while passing false has the effect of
// decoding asynchronously, but that's not obvious from the argument name.
// This API needs to be reworked.
LookupFrame(0, targetSize, DecodeFlags(aFlags),
/* aShouldSyncNotify = */ shouldSyncDecodeSmallImages);
LookupFrame(0, targetSize, flags,
/* aShouldSyncNotify = */ shouldSyncDecodeIfFast);
return NS_OK;
}