This CL allows the SkScanlineDecoder to decode partial
scanlines.
This is a first step in efficiently implementing subsetting
in SkScaledCodec.
BUG=skia:4209
Review URL: https://codereview.chromium.org/1390213002
Use SkCodecPrintf instead of SkDebugf.
Check if the conversion is possible rather than starting many decodes
that will certainly fail.
Small refactor to code that deals with subsets that fall outside
of the image.
BUG=skia:
Review URL: https://codereview.chromium.org/1395383002
Rather than implementing some sort of "fill" in every
SkCodec subclass for incomplete images, let's make the
parent class handle this situation.
This includes an API change to SkCodec.h
SkCodec::getScanlines() now returns the number of lines it
read successfully, rather than an SkCodec::Result enum.
getScanlines() most often fails on an incomplete input, in
which case it is useful to know how many lines were
successfully decoded - this provides more information than
kIncomplete vs kSuccess. We do lose information when the
API is used improperly, as we are no longer able to return
kInvalidParameter or kScanlineNotStarted.
Known Issues:
Does not work for incomplete fFrameIsSubset gifs.
Does not work for incomplete icos.
BUG=skia:
Review URL: https://codereview.chromium.org/1332053002
Looking in Gold, I see some ICO images that only show the upper left
corner of the originals. It is happening because we use different ways
of deciding what the dimensions are:
In CodecSrc::size(), we use an SkScaledCodec to get the dimensions,
even when fMode is not kScaledCodec_Mode.
In CodecSrc::draw(), we only use SkScaledCodec in kScaledCodec_Mode.
My recent CL to combine SkScanlineDecoder with SkCodec revealed this
bug, because now SkScaledCodec::NewFromStream will succeed on ICO.
(Previously, it failed because we do not yet have a scanline decoder
for ICO (skbug.com/4404). Now that they are combined, we would need
to specially flag ICO to stop returning an SkScaledCodec.)
Switch size() to use the correct type of codec.
Review URL: https://codereview.chromium.org/1373253004
Benefits:
- This mimics other decoding APIs (including the ones SkCodec relies
on, e.g. a png_struct, which can be used to decode an entire image or
one line at a time).
- It allows a client to ask us to do what we can do efficiently - i.e.
start from encoded data and either decode the whole thing or scanlines.
- It removes the duplicate methods which appeared in both SkCodec and
SkScanlineDecoder (some of which, e.g. in SkJpegScanlineDecoder, just
call fCodec->sameMethod()).
- It simplifies moving more checks into the base class (e.g. the
examples in skbug.com/4284).
BUG=skia:4175
BUG=skia:4284
=====================================================================
SkScanlineDecoder.h/.cpp:
Removed.
SkCodec.h/.cpp:
Add methods, enums, and variables which were previously in
SkScanlineDecoder.
Default fCurrScanline to -1, as a sentinel that start has not been
called.
General changes:
Convert SkScanlineDecoders to SkCodecs.
General changes in SkCodec subclasses:
Merge SkScanlineDecoder implementation into SkCodec. Most (all?) owned
an SkCodec, so they now call this-> instead of fCodec->.
SkBmpCodec.h/.cpp:
Replace the unused rowOrder method with an override for
onGetScanlineOrder.
Make getDstRow const, since it is called by onGetY, which is const.
SkCodec_libpng.h/.cpp:
Make SkPngCodec an abstract class, with two subclasses which handle
scanline decoding separately (they share code for decoding the entire
image). Reimplement onReallyHasAlpha so that it can return the most
recent result (e.g. after a scanline decode which only decoded part
of the image) or a better answer (e.g. if the whole image is known to
be opaque).
Compute fNumberPasses early, so we know which subclass to instantiate.
Make SkPngInterlaceScanlineDecoder use the base class' fCurrScanline
rather than a separate variable.
CodexTest.cpp:
Add tests for the state changes in SkCodec (need to call start before
decoding scanlines; calling getPixels means that start will need to
be called again before decoding more scanlines).
Add a test which decodes in stripes, currently only used for an
interlaced PNG.
TODO: Add tests for onReallyHasAlpha.
Review URL: https://codereview.chromium.org/1365313002
- use C++11 features ({} init, move constructors) to eliminate the need
for explicit constructors
- collapse RECORD0...RECORD8 into just one RECORD macro
- explicitly tag record types instead of using member detectors.
Removing member detectors makes this code significantly less fragile.
This exposes a few places where we didn't really think through what to do
with SkDrawable. I've marked them TODO for now.
BUG=skia:
Review URL: https://codereview.chromium.org/1360943003
Motivation: I want too finalize this API before working on the more
complex problem of adding XMP metadata for PDF/A.
BUG=skia:3110
Review URL: https://codereview.chromium.org/1359943003
SkBitmapRegionDecoderInterface provides an interface
for multiple implementations of Android's
BitmapRegionDecoder.
We already have correctness tests in DM that will enable us
to compare the quality of our various BRD implementations.
We also need these performance tests to compare the speed
of our various implementations.
BUG=skia:4357
Review URL: https://codereview.chromium.org/1344993003
*** Add CodecMode and ScaledCodecMode (in place of
NormalMode), so now we test SkCodec's getPixels() and
SkScaledCodec's getPixels()
*** Don't attempt to test scanline and codec modes using
the dimensions that were recommended for SkScaledCodec.
*** Change tags so that each scale gets its own output
folder.
TODO: Make ScanlineMode and ScanlineSubsetMode support
kOutOfOrder etc. I think this belongs with the gif CL -
I don't want to add test modes that we don't run yet.
BUG=skia:4202
BUG=skia:4238
Review URL: https://codereview.chromium.org/1327433003
Redesigns SkScanlineDecoder.h to indicate the ordering
in which the scanlines are provided
Refactors SkSwizzler::Fill() to include the zeroInit check
and to actually be correct.
BUG=skia:3257
BUG=skia:4198
Review URL: https://codereview.chromium.org/1287423002
We don't want to test small images on Gold because they are
not interested to look at. Instead, I wrote a unit test to
verify that scaling small images does not cause crashes.
BUG=skia:
Review URL: https://codereview.chromium.org/1287863004
Prior to this CL, if a client wanted to decode scanlines, they had to
create an SkCodec in order to get an SkScanlineDecoder. This introduces
complications if input data is not easily shared between the two
objects.
Instead, add methods to SkScanlineDecoder for creating a new one from
input data, and remove the creation functions from SkCodec.
Update DM and tests.
Review URL: https://codereview.chromium.org/1267583002
The decoding tests can now veto indirect sinks like pipe-8888.
This moves Sink type detection from automatic to explicit; I can't think of any
way to automatically differentiate pipe-8888 from 8888 based only on the
output. (They should ideally be identical, after all.)
BUG=skia:4138
Review URL: https://codereview.chromium.org/1263113002
In CodecSrc's scanline_subset test, we decode a subset of an image to a
bitmap, draw it to the canvas, and then repeat. This is fine for most
backends, but not for pipe. Pipe sees the same generation ID, so it
assumes it is the same bitmap it saw before, and just draws the
original one.
Call notifyPixelsChanged, so the bitmap will get a new generation ID,
fixing pipe.
BUG=skia:4138
Review URL: https://codereview.chromium.org/1265983004
This breaks Sinks down into three auto-detected types:
- GPU: anything that requests to be run in the GPU enclave
- Vector: anything that writes to the stream instead of the bitmap
- Raster: everything else
Some examples: gpu -> GPU, msaa16 -> GPU, 8888 -> raster, pdf -> vector,
svg -> vector, pipe-8888 -> raster, tiles_rt-gpu -> GPU
This lets image decoding sinks veto non-raster backends explicitly,
and can let particular GMs veto GPU or non-GPU sinks as they like.
BUG=skia:
Review URL: https://codereview.chromium.org/1239953004
This allows codecs that support subsets natively (i.e. WEBP) to do so.
Add a field on SkCodec::Options representing the subset.
Add a method on SkCodec to find a valid subset which approximately
matches a desired subset.
Implement subset decodes in SkWebpCodec.
Add a test in DM for decoding subsets.
Notice that we only start on even boundaries. This is due to the
way libwebp's API works. SkWEBPImageDecoder does not take this into
account, which results in visual artifacts.
FIXME: Subsets with scaling are not pixel identical, but close. (This
may be fine, though - they are not perceptually different. We'll just
need to mark another set of images in gold as valid, once
https://skbug.com/4038 is fixed, so we can tests scaled webp without
generating new images on each run.)
Review URL: https://codereview.chromium.org/1240143002
Make getScanlineDecoder return a new object each time, which is
owned by the caller, and independent from any existing scanline
decoders and the SkCodec itself.
Since the SkCodec already contains the entire state machine, and it
is used by the scanline decoders, simply create a new SkCodec which
is now owned by the scanline decoder.
Move code that cleans up after using a scanline decoder into its
destructor
One side effect is that creating the first scanline decoder requires
a duplication of the stream and re-reading the header. (With some
more complexity/changes, we could pass the state machine to the
scanline decoder and make the SkCodec recreate its own state machine
instead.) The typical client of the scanline decoder (region decoder)
uses an SkMemoryStream, so the duplication is cheap, although we
should consider the extra time to reread the header/recreate the state
machine. (If/when we use the scanline decoder for other purposes,
where the stream may not be cheaply duplicated, we should consider
passing the state machine.)
One (intended) result of this change is that a client can create a
new scanline decoder in a new thread, and decode different pieces of
the image simultaneously.
In SkPngCodec::decodePalette, use fBitDepth rather than a parameter.
Review URL: https://codereview.chromium.org/1230033004
SkImageGenerator makes some assumptions that are not necessarily valid
for SkCodec. For example, SkCodec does not assume that it can always be
rewound.
We also have an ongoing question of what an SkCodec should report as
its default settings (i.e. the return from getInfo). It makes sense for
an SkCodec to report that its pixels are unpremultiplied, if that is
the case for the underlying data, but if a client of SkImageGenerator
uses the default settings (as many do), they will receive
unpremultiplied pixels which cannot (currently) be drawn with Skia. We
may ultimately decide to revisit SkCodec reporting an SkImageInfo, but
I have left it unchanged for now.
Import features of SkImageGenerator used by SkCodec into SkCodec.
I have left SkImageGenerator unchanged for now, but it no longer needs
Result or Options. This will require changes to Chromium.
Manually handle the lifetime of fScanlineDecoder, so SkScanlineDecoder.h
can include SkCodec.h (where Result is), and SkCodec.h does not need
to include it (to delete fScanlineDecoder).
In many places, make the following simple changes:
- Now include SkScanlineDecoder.h, which is no longer included by
SkCodec.h
- Use the enums in SkCodec, rather than SkImageGenerator
- Stop including SkImageGenerator.h where no longer needed
Review URL: https://codereview.chromium.org/1220733013
I originally thought that there was no harm in reading or skipping
zero lines after we have already reached the end of the image.
However, once we reach the end of the image, onFinish() is
automatically called. Performing a read or a skip after
the call to onFinish() is invalid and will cause onFinish()
to be called a second time (which is also invalid).
Seems like the code requires good behavior and the test is
wrong.
BUG=skia:
Review URL: https://codereview.chromium.org/1179213002
kScanline_Subset_Mode decodes the image in subsets using a
scanline decoder.
The number of subsets can be specified by changing the constant divisor.
The number of subsets is equal to divisor*divisor.
Review URL: https://codereview.chromium.org/1157153003
Previously it was hard to tell that DrawFn took an SkCanvas* and returned an Error. Now it's clear from the type.
BUG=skia:
Review URL: https://codereview.chromium.org/1125233002
If so, let's do it this way so it works for all source types and doesn't need
to be chosen at compile time.
BUG=skia:
Review URL: https://codereview.chromium.org/1129693003
Will use this to test the other CL that adds small SkPicture implementations.
Not quite sure why patch_primitive doesn't draw the same in 8888 and sp-8888, but everything else does, so I'm not going to let that hold me back for now.
BUG=skia:
Review URL: https://codereview.chromium.org/1126613005
