/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkCodec_DEFINED
#define SkCodec_DEFINED
#include "../private/SkTemplates.h"
#include "SkColor.h"
#include "SkEncodedFormat.h"
#include "SkImageInfo.h"
#include "SkSize.h"
#include "SkStream.h"
#include "SkTypes.h"
class SkData;
class SkPngChunkReader;
class SkSampler;
/**
* Abstraction layer directly on top of an image codec.
*/
class SkCodec : SkNoncopyable {
public:
/**
* Minimum number of bytes that must be buffered in SkStream input.
*
* An SkStream passed to NewFromStream must be able to use this many
* bytes to determine the image type. Then the same SkStream must be
* passed to the correct decoder to read from the beginning.
*
* This can be accomplished by implementing peek() to support peeking
* this many bytes, or by implementing rewind() to be able to rewind()
* after reading this many bytes.
*/
static size_t MinBufferedBytesNeeded();
/**
* If this stream represents an encoded image that we know how to decode,
* return an SkCodec that can decode it. Otherwise return NULL.
*
* As stated above, this call must be able to peek or read
* MinBufferedBytesNeeded to determine the correct format, and then start
* reading from the beginning. First it will attempt to peek, and it
* assumes that if less than MinBufferedBytesNeeded bytes (but more than
* zero) are returned, this is because the stream is shorter than this,
* so falling back to reading would not provide more data. If peek()
* returns zero bytes, this call will instead attempt to read(). This
* will require that the stream can be rewind()ed.
*
* If SkPngChunkReader is not NULL, take a ref and pass it to libpng if
* the image is a png.
*
* If the SkPngChunkReader is not NULL then:
* If the image is not a PNG, the SkPngChunkReader will be ignored.
* If the image is a PNG, the SkPngChunkReader will be reffed.
* If the PNG has unknown chunks, the SkPngChunkReader will be used
* to handle these chunks. SkPngChunkReader will be called to read
* any unknown chunk at any point during the creation of the codec
* or the decode. Note that if SkPngChunkReader fails to read a
* chunk, this could result in a failure to create the codec or a
* failure to decode the image.
* If the PNG does not contain unknown chunks, the SkPngChunkReader
* will not be used or modified.
*
* If NULL is returned, the stream is deleted immediately. Otherwise, the
* SkCodec takes ownership of it, and will delete it when done with it.
*/
static SkCodec* NewFromStream(SkStream*, SkPngChunkReader* = NULL);
/**
* If this data represents an encoded image that we know how to decode,
* return an SkCodec that can decode it. Otherwise return NULL.
*
* If the SkPngChunkReader is not NULL then:
* If the image is not a PNG, the SkPngChunkReader will be ignored.
* If the image is a PNG, the SkPngChunkReader will be reffed.
* If the PNG has unknown chunks, the SkPngChunkReader will be used
* to handle these chunks. SkPngChunkReader will be called to read
* any unknown chunk at any point during the creation of the codec
* or the decode. Note that if SkPngChunkReader fails to read a
* chunk, this could result in a failure to create the codec or a
* failure to decode the image.
* If the PNG does not contain unknown chunks, the SkPngChunkReader
* will not be used or modified.
*
* Will take a ref if it returns a codec, else will not affect the data.
*/
static SkCodec* NewFromData(SkData*, SkPngChunkReader* = NULL);
virtual ~SkCodec();
/**
* Return the ImageInfo associated with this codec.
*/
const SkImageInfo& getInfo() const { return fSrcInfo; }
/**
* Return a size that approximately supports the desired scale factor.
* The codec may not be able to scale efficiently to the exact scale
* factor requested, so return a size that approximates that scale.
* The returned value is the codec's suggestion for the closest valid
* scale that it can natively support
*/
SkISize getScaledDimensions(float desiredScale) const {
// Negative and zero scales are errors.
SkASSERT(desiredScale > 0.0f);
if (desiredScale <= 0.0f) {
return SkISize::Make(0, 0);
}
// Upscaling is not supported. Return the original size if the client
// requests an upscale.
if (desiredScale >= 1.0f) {
return this->getInfo().dimensions();
}
return this->onGetScaledDimensions(desiredScale);
}
/**
* Return (via desiredSubset) a subset which can decoded from this codec,
* or false if this codec cannot decode subsets or anything similar to
* desiredSubset.
*
* @param desiredSubset In/out parameter. As input, a desired subset of
* the original bounds (as specified by getInfo). If true is returned,
* desiredSubset may have been modified to a subset which is
* supported. Although a particular change may have been made to
* desiredSubset to create something supported, it is possible other
* changes could result in a valid subset.
* If false is returned, desiredSubset's value is undefined.
* @return true if this codec supports decoding desiredSubset (as
* returned, potentially modified)
*/
bool getValidSubset(SkIRect* desiredSubset) const {
return this->onGetValidSubset(desiredSubset);
}
/**
* Format of the encoded data.
*/
SkEncodedFormat getEncodedFormat() const { return this->onGetEncodedFormat(); }
/**
* Used to describe the result of a call to getPixels().
*
* Result is the union of possible results from subclasses.
*/
enum Result {
/**
* General return value for success.
*/
kSuccess,
/**
* The input is incomplete. A partial image was generated.
*/
kIncompleteInput,
/**
* The generator cannot convert to match the request, ignoring
* dimensions.
*/
kInvalidConversion,
/**
* The generator cannot scale to requested size.
*/
kInvalidScale,
/**
* Parameters (besides info) are invalid. e.g. NULL pixels, rowBytes
* too small, etc.
*/
kInvalidParameters,
/**
* The input did not contain a valid image.
*/
kInvalidInput,
/**
* Fulfilling this request requires rewinding the input, which is not
* supported for this input.
*/
kCouldNotRewind,
/**
* This method is not implemented by this codec.
* FIXME: Perhaps this should be kUnsupported?
*/
kUnimplemented,
};
/**
* Whether or not the memory passed to getPixels is zero initialized.
*/
enum ZeroInitialized {
/**
* The memory passed to getPixels is zero initialized. The SkCodec
* may take advantage of this by skipping writing zeroes.
*/
kYes_ZeroInitialized,
/**
* The memory passed to getPixels has not been initialized to zero,
* so the SkCodec must write all zeroes to memory.
*
* This is the default. It will be used if no Options struct is used.
*/
kNo_ZeroInitialized,
};
/**
* Additional options to pass to getPixels.
*/
struct Options {
Options()
: fZeroInitialized(kNo_ZeroInitialized)
, fSubset(NULL)
{}
ZeroInitialized fZeroInitialized;
/**
* If not NULL, represents a subset of the original image to decode.
* Must be within the bounds returned by getInfo().
* If the EncodedFormat is kWEBP_SkEncodedFormat (the only one which
* currently supports subsets), the top and left values must be even.
*
* In getPixels, we will attempt to decode the exact rectangular
* subset specified by fSubset.
*
* In a scanline decode, it does not make sense to specify a subset
* top or subset height, since the client already controls which rows
* to get and which rows to skip. During scanline decodes, we will
* require that the subset top be zero and the subset height be equal
* to the full height. We will, however, use the values of
* subset left and subset width to decode partial scanlines on calls
* to getScanlines().
*/
SkIRect* fSubset;
};
/**
* Decode into the given pixels, a block of memory of size at
* least (info.fHeight - 1) * rowBytes + (info.fWidth *
* bytesPerPixel)
*
* Repeated calls to this function should give the same results,
* allowing the PixelRef to be immutable.
*
* @param info A description of the format (config, size)
* expected by the caller. This can simply be identical
* to the info returned by getInfo().
*
* This contract also allows the caller to specify
* different output-configs, which the implementation can
* decide to support or not.
*
* A size that does not match getInfo() implies a request
* to scale. If the generator cannot perform this scale,
* it will return kInvalidScale.
*
* If info is kIndex8_SkColorType, then the caller must provide storage for up to 256
* SkPMColor values in ctable. On success the generator must copy N colors into that storage,
* (where N is the logical number of table entries) and set ctableCount to N.
*
* If info is not kIndex8_SkColorType, then the last two parameters may be NULL. If ctableCount
* is not null, it will be set to 0.
*
* If a scanline decode is in progress, scanline mode will end, requiring the client to call
* startScanlineDecode() in order to return to decoding scanlines.
*
* @return Result kSuccess, or another value explaining the type of failure.
*/
Result getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options*,
SkPMColor ctable[], int* ctableCount);
/**
* Simplified version of getPixels() that asserts that info is NOT kIndex8_SkColorType and
* uses the default Options.
*/
Result getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
struct YUVSizeInfo {
SkISize fYSize;
SkISize fUSize;
SkISize fVSize;
/**
* While the widths of the Y, U, and V planes are not restricted, the
* implementation requires that the width of the memory allocated for
* each plane be a multiple of DCTSIZE (which is always 8).
*
* This struct allows us to inform the client how many "widthBytes"
* that we need. Note that we use the new idea of "widthBytes"
* because this idea is distinct from "rowBytes" (used elsewhere in
* Skia). "rowBytes" allow the last row of the allocation to not
* include any extra padding, while, in this case, every single row of
* the allocation must be at least "widthBytes".
*/
size_t fYWidthBytes;
size_t fUWidthBytes;
size_t fVWidthBytes;
};
/**
* If decoding to YUV is supported, this returns true. Otherwise, this
* returns false and does not modify any of the parameters.
*
* @param sizeInfo Output parameter indicating the sizes and required
* allocation widths of the Y, U, and V planes.
* @param colorSpace Output parameter. If non-NULL this is set to kJPEG,
* otherwise this is ignored.
*/
bool queryYUV8(YUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const {
if (nullptr == sizeInfo) {
return false;
}
return this->onQueryYUV8(sizeInfo, colorSpace);
}
/**
* Returns kSuccess, or another value explaining the type of failure.
* This always attempts to perform a full decode. If the client only
* wants size, it should call queryYUV8().
*
* @param sizeInfo Needs to exactly match the values returned by the
* query, except the WidthBytes may be larger than the
* recommendation (but not smaller).
* @param planes Memory for each of the Y, U, and V planes.
*/
Result getYUV8Planes(const YUVSizeInfo& sizeInfo, void* planes[3]) {
if (nullptr == planes || nullptr == planes[0] || nullptr == planes[1] ||
nullptr == planes[2]) {
return kInvalidInput;
}
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
}
return this->onGetYUV8Planes(sizeInfo, planes);
}
/**
* The remaining functions revolve around decoding scanlines.
*/
/**
* Prepare for a scanline decode with the specified options.
*
* After this call, this class will be ready to decode the first scanline.
*
* This must be called in order to call getScanlines or skipScanlines.
*
* This may require rewinding the stream.
*
* Not all SkCodecs support this.
*
* @param dstInfo Info of the destination. If the dimensions do not match
* those of getInfo, this implies a scale.
* @param options Contains decoding options, including if memory is zero
* initialized.
* @param ctable A pointer to a color table. When dstInfo.colorType() is
* kIndex8, this should be non-NULL and have enough storage for 256
* colors. The color table will be populated after decoding the palette.
* @param ctableCount A pointer to the size of the color table. When
* dstInfo.colorType() is kIndex8, this should be non-NULL. It will
* be modified to the true size of the color table (<= 256) after
* decoding the palette.
* @return Enum representing success or reason for failure.
*/
Result startScanlineDecode(const SkImageInfo& dstInfo, const SkCodec::Options* options,
SkPMColor ctable[], int* ctableCount);
/**
* Simplified version of startScanlineDecode() that asserts that info is NOT
* kIndex8_SkColorType and uses the default Options.
*/
Result startScanlineDecode(const SkImageInfo& dstInfo);
/**
* Write the next countLines scanlines into dst.
*
* Not valid to call before calling startScanlineDecode().
*
* @param dst Must be non-null, and large enough to hold countLines
* scanlines of size rowBytes.
* @param countLines Number of lines to write.
* @param rowBytes Number of bytes per row. Must be large enough to hold
* a scanline based on the SkImageInfo used to create this object.
* @return the number of lines successfully decoded. If this value is
* less than countLines, this will fill the remaining lines with a
* default value.
*/
int getScanlines(void* dst, int countLines, size_t rowBytes);
/**
* Skip count scanlines.
*
* Not valid to call before calling startScanlineDecode().
*
* The default version just calls onGetScanlines and discards the dst.
* NOTE: If skipped lines are the only lines with alpha, this default
* will make reallyHasAlpha return true, when it could have returned
* false.
*
* @return true if the scanlines were successfully skipped
* false on failure, possible reasons for failure include:
* An incomplete input image stream.
* Calling this function before calling startScanlineDecode().
* If countLines is less than zero or so large that it moves
* the current scanline past the end of the image.
*/
bool skipScanlines(int countLines);
/**
* The order in which rows are output from the scanline decoder is not the
* same for all variations of all image types. This explains the possible
* output row orderings.
*/
enum SkScanlineOrder {
/*
* By far the most common, this indicates that the image can be decoded
* reliably using the scanline decoder, and that rows will be output in
* the logical order.
*/
kTopDown_SkScanlineOrder,
/*
* This indicates that the scanline decoder reliably outputs rows, but
* they will be returned in reverse order. If the scanline format is
* kBottomUp, the nextScanline() API can be used to determine the actual
* y-coordinate of the next output row, but the client is not forced
* to take advantage of this, given that it's not too tough to keep
* track independently.
*
* For full image decodes, it is safe to get all of the scanlines at
* once, since the decoder will handle inverting the rows as it
* decodes.
*
* For subset decodes and sampling, it is simplest to get and skip
* scanlines one at a time, using the nextScanline() API. It is
* possible to ask for larger chunks at a time, but this should be used
* with caution. As with full image decodes, the decoder will handle
* inverting the requested rows, but rows will still be delivered
* starting from the bottom of the image.
*
* Upside down bmps are an example.
*/
kBottomUp_SkScanlineOrder,
/*
* This indicates that the scanline decoder reliably outputs rows, but
* they will not be in logical order. If the scanline format is
* kOutOfOrder, the nextScanline() API should be used to determine the
* actual y-coordinate of the next output row.
*
* For this scanline ordering, it is advisable to get and skip
* scanlines one at a time.
*
* Interlaced gifs are an example.
*/
kOutOfOrder_SkScanlineOrder,
/*
* Indicates that the entire image must be decoded in order to output
* any amount of scanlines. In this case, it is a REALLY BAD IDEA to
* request scanlines 1-by-1 or in small chunks. The client should
* determine which scanlines are needed and ask for all of them in
* a single call to getScanlines().
*
* Interlaced pngs are an example.
*/
kNone_SkScanlineOrder,
};
/**
* An enum representing the order in which scanlines will be returned by
* the scanline decoder.
*
* This is undefined before startScanlineDecode() is called.
*/
SkScanlineOrder getScanlineOrder() const { return this->onGetScanlineOrder(); }
/**
* Returns the y-coordinate of the next row to be returned by the scanline
* decoder.
*
* This will equal fCurrScanline, except in the case of strangely
* encoded image types (bottom-up bmps, interlaced gifs).
*
* Results are undefined when not in scanline decoding mode.
*/
int nextScanline() const { return this->outputScanline(fCurrScanline); }
/**
* Returns the output y-coordinate of the row that corresponds to an input
* y-coordinate. The input y-coordinate represents where the scanline
* is located in the encoded data.
*
* This will equal inputScanline, except in the case of strangely
* encoded image types (bottom-up bmps, interlaced gifs).
*/
int outputScanline(int inputScanline) const;
protected:
SkCodec(const SkImageInfo&, SkStream*);
virtual SkISize onGetScaledDimensions(float /*desiredScale*/) const {
// By default, scaling is not supported.
return this->getInfo().dimensions();
}
// FIXME: What to do about subsets??
/**
* Subclasses should override if they support dimensions other than the
* srcInfo's.
*/
virtual bool onDimensionsSupported(const SkISize&) {
return false;
}
virtual SkEncodedFormat onGetEncodedFormat() const = 0;
/**
* @param rowsDecoded When the encoded image stream is incomplete, this function
* will return kIncompleteInput and rowsDecoded will be set to
* the number of scanlines that were successfully decoded.
* This will allow getPixels() to fill the uninitialized memory.
*/
virtual Result onGetPixels(const SkImageInfo& info,
void* pixels, size_t rowBytes, const Options&,
SkPMColor ctable[], int* ctableCount,
int* rowsDecoded) = 0;
virtual bool onQueryYUV8(YUVSizeInfo*, SkYUVColorSpace*) const {
return false;
}
virtual Result onGetYUV8Planes(const YUVSizeInfo&, void*[3] /*planes*/) {
return kUnimplemented;
}
virtual bool onGetValidSubset(SkIRect* /*desiredSubset*/) const {
// By default, subsets are not supported.
return false;
}
/**
* If the stream was previously read, attempt to rewind.
*
* If the stream needed to be rewound, call onRewind.
* @returns true if the codec is at the right position and can be used.
* false if there was a failure to rewind.
*
* This is called by getPixels() and start(). Subclasses may call if they
* need to rewind at another time.
*/
bool SK_WARN_UNUSED_RESULT rewindIfNeeded();
/**
* Called by rewindIfNeeded, if the stream needed to be rewound.
*
* Subclasses should do any set up needed after a rewind.
*/
virtual bool onRewind() {
return true;
}
/**
* On an incomplete input, getPixels() and getScanlines() will fill any uninitialized
* scanlines. This allows the subclass to indicate what value to fill with.
*
* @param colorType Destination color type.
* @return The value with which to fill uninitialized pixels.
*
* Note that we can interpret the return value as an SkPMColor, a 16-bit 565 color,
* an 8-bit gray color, or an 8-bit index into a color table, depending on the color
* type.
*/
uint32_t getFillValue(SkColorType colorType) const {
return this->onGetFillValue(colorType);
}
/**
* Some subclasses will override this function, but this is a useful default for the color
* types that we support. Note that for color types that do not use the full 32-bits,
* we will simply take the low bits of the fill value.
*
* kN32_SkColorType: Transparent or Black, depending on the src alpha type
* kRGB_565_SkColorType: Black
* kGray_8_SkColorType: Black
* kIndex_8_SkColorType: First color in color table
*/
virtual uint32_t onGetFillValue(SkColorType /*colorType*/) const {
return kOpaque_SkAlphaType == fSrcInfo.alphaType() ? SK_ColorBLACK : SK_ColorTRANSPARENT;
}
/**
* Get method for the input stream
*/
SkStream* stream() {
return fStream.get();
}
/**
* The remaining functions revolve around decoding scanlines.
*/
/**
* Most images types will be kTopDown and will not need to override this function.
*/
virtual SkScanlineOrder onGetScanlineOrder() const { return kTopDown_SkScanlineOrder; }
/**
* Update the current scanline. Used by interlaced png.
*/
void updateCurrScanline(int newY) { fCurrScanline = newY; }
const SkImageInfo& dstInfo() const { return fDstInfo; }
const SkCodec::Options& options() const { return fOptions; }
/**
* Returns the number of scanlines that have been decoded so far.
* This is unaffected by the SkScanlineOrder.
*
* Returns -1 if we have not started a scanline decode.
*/
int currScanline() const { return fCurrScanline; }
virtual int onOutputScanline(int inputScanline) const;
private:
const SkImageInfo fSrcInfo;
SkAutoTDelete<SkStream> fStream;
bool fNeedsRewind;
// These fields are only meaningful during scanline decodes.
SkImageInfo fDstInfo;
SkCodec::Options fOptions;
int fCurrScanline;
/**
* Return whether these dimensions are supported as a scale.
*
* The codec may choose to cache the information about scale and subset.
* Either way, the same information will be passed to onGetPixels/onStart
* on success.
*
* This must return true for a size returned from getScaledDimensions.
*/
bool dimensionsSupported(const SkISize& dim) {
return dim == fSrcInfo.dimensions() || this->onDimensionsSupported(dim);
}
// Methods for scanline decoding.
virtual SkCodec::Result onStartScanlineDecode(const SkImageInfo& /*dstInfo*/,
const SkCodec::Options& /*options*/, SkPMColor* /*ctable*/, int* /*ctableCount*/) {
return kUnimplemented;
}
virtual bool onSkipScanlines(int /*countLines*/) { return false; }
virtual int onGetScanlines(void* /*dst*/, int /*countLines*/, size_t /*rowBytes*/) { return 0; }
/**
* On an incomplete decode, getPixels() and getScanlines() will call this function
* to fill any uinitialized memory.
*
* @param dstInfo Contains the destination color type
* Contains the destination alpha type
* Contains the destination width
* The height stored in this info is unused
* @param dst Pointer to the start of destination pixel memory
* @param rowBytes Stride length in destination pixel memory
* @param zeroInit Indicates if memory is zero initialized
* @param linesRequested Number of lines that the client requested
* @param linesDecoded Number of lines that were successfully decoded
*/
void fillIncompleteImage(const SkImageInfo& dstInfo, void* dst, size_t rowBytes,
ZeroInitialized zeroInit, int linesRequested, int linesDecoded);
/**
* Return an object which will allow forcing scanline decodes to sample in X.
*
* May create a sampler, if one is not currently being used. Otherwise, does
* not affect ownership.
*
* Only valid during scanline decoding.
*/
virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr; }
friend class SkSampledCodec;
friend class SkIcoCodec;
};
#endif // SkCodec_DEFINED