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-rw-r--r--src/codec/SkCodec.cpp125
-rw-r--r--src/codec/SkGifCodec.cpp2
-rw-r--r--src/codec/SkIcoCodec.cpp81
-rw-r--r--src/codec/SkIcoCodec.h13
-rw-r--r--src/codec/SkPngCodec.cpp700
-rw-r--r--src/codec/SkPngCodec.h37
-rw-r--r--src/codec/SkSampledCodec.cpp164
-rw-r--r--src/codec/SkSampler.h29
8 files changed, 387 insertions, 764 deletions
diff --git a/src/codec/SkCodec.cpp b/src/codec/SkCodec.cpp
index 3c485c8beb..3da7f5fb07 100644
--- a/src/codec/SkCodec.cpp
+++ b/src/codec/SkCodec.cpp
@@ -154,20 +154,6 @@ bool SkCodec::rewindIfNeeded() {
return this->onRewind();
}
-#define CHECK_COLOR_TABLE \
- if (kIndex_8_SkColorType == info.colorType()) { \
- if (nullptr == ctable || nullptr == ctableCount) { \
- return SkCodec::kInvalidParameters; \
- } \
- } else { \
- if (ctableCount) { \
- *ctableCount = 0; \
- } \
- ctableCount = nullptr; \
- ctable = nullptr; \
- }
-
-
SkCodec::Result SkCodec::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
const Options* options, SkPMColor ctable[], int* ctableCount) {
if (kUnknown_SkColorType == info.colorType()) {
@@ -180,7 +166,17 @@ SkCodec::Result SkCodec::getPixels(const SkImageInfo& info, void* pixels, size_t
return kInvalidParameters;
}
- CHECK_COLOR_TABLE;
+ if (kIndex_8_SkColorType == info.colorType()) {
+ if (nullptr == ctable || nullptr == ctableCount) {
+ return kInvalidParameters;
+ }
+ } else {
+ if (ctableCount) {
+ *ctableCount = 0;
+ }
+ ctableCount = nullptr;
+ ctable = nullptr;
+ }
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
@@ -232,77 +228,22 @@ SkCodec::Result SkCodec::getPixels(const SkImageInfo& info, void* pixels, size_t
return this->getPixels(info, pixels, rowBytes, nullptr, nullptr, nullptr);
}
-SkCodec::Result SkCodec::startIncrementalDecode(const SkImageInfo& info, void* pixels,
- size_t rowBytes, const SkCodec::Options* options, SkPMColor* ctable, int* ctableCount) {
- fStartedIncrementalDecode = false;
-
- if (kUnknown_SkColorType == info.colorType()) {
- return kInvalidConversion;
- }
- if (nullptr == pixels) {
- return kInvalidParameters;
- }
-
- // Ensure that valid color ptrs are passed in for kIndex8 color type
- CHECK_COLOR_TABLE;
-
- // FIXME: If the rows come after the rows of a previous incremental decode,
- // we might be able to skip the rewind, but only the implementation knows
- // that. (e.g. PNG will always need to rewind, since we called longjmp, but
- // a bottom-up BMP could skip rewinding if the new rows are above the old
- // rows.)
- if (!this->rewindIfNeeded()) {
- return kCouldNotRewind;
- }
-
- // Set options.
- Options optsStorage;
- if (nullptr == options) {
- options = &optsStorage;
- } else if (options->fSubset) {
- SkIRect size = SkIRect::MakeSize(info.dimensions());
- if (!size.contains(*options->fSubset)) {
- return kInvalidParameters;
- }
-
- const int top = options->fSubset->top();
- const int bottom = options->fSubset->bottom();
- if (top < 0 || top >= info.height() || top >= bottom || bottom > info.height()) {
- return kInvalidParameters;
- }
- }
-
- if (!this->dimensionsSupported(info.dimensions())) {
- return kInvalidScale;
- }
-
- fDstInfo = info;
- fOptions = *options;
-
- const Result result = this->onStartIncrementalDecode(info, pixels, rowBytes,
- fOptions, ctable, ctableCount);
- if (kSuccess == result) {
- fStartedIncrementalDecode = true;
- } else if (kUnimplemented == result) {
- // FIXME: This is temporarily necessary, until we transition SkCodec
- // implementations from scanline decoding to incremental decoding.
- // SkAndroidCodec will first attempt to use incremental decoding, but
- // will fall back to scanline decoding if incremental returns
- // kUnimplemented. rewindIfNeeded(), above, set fNeedsRewind to true
- // (after potentially rewinding), but we do not want the next call to
- // startScanlineDecode() to do a rewind.
- fNeedsRewind = false;
- }
- return result;
-}
-
-
-SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& info,
+SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& dstInfo,
const SkCodec::Options* options, SkPMColor ctable[], int* ctableCount) {
// Reset fCurrScanline in case of failure.
fCurrScanline = -1;
// Ensure that valid color ptrs are passed in for kIndex8 color type
- CHECK_COLOR_TABLE;
+ if (kIndex_8_SkColorType == dstInfo.colorType()) {
+ if (nullptr == ctable || nullptr == ctableCount) {
+ return SkCodec::kInvalidParameters;
+ }
+ } else {
+ if (ctableCount) {
+ *ctableCount = 0;
+ }
+ ctableCount = nullptr;
+ ctable = nullptr;
+ }
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
@@ -313,38 +254,36 @@ SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& info,
if (nullptr == options) {
options = &optsStorage;
} else if (options->fSubset) {
- SkIRect size = SkIRect::MakeSize(info.dimensions());
+ SkIRect size = SkIRect::MakeSize(dstInfo.dimensions());
if (!size.contains(*options->fSubset)) {
return kInvalidInput;
}
// We only support subsetting in the x-dimension for scanline decoder.
// Subsetting in the y-dimension can be accomplished using skipScanlines().
- if (options->fSubset->top() != 0 || options->fSubset->height() != info.height()) {
+ if (options->fSubset->top() != 0 || options->fSubset->height() != dstInfo.height()) {
return kInvalidInput;
}
}
// FIXME: Support subsets somehow?
- if (!this->dimensionsSupported(info.dimensions())) {
+ if (!this->dimensionsSupported(dstInfo.dimensions())) {
return kInvalidScale;
}
- const Result result = this->onStartScanlineDecode(info, *options, ctable, ctableCount);
+ const Result result = this->onStartScanlineDecode(dstInfo, *options, ctable, ctableCount);
if (result != SkCodec::kSuccess) {
return result;
}
fCurrScanline = 0;
- fDstInfo = info;
+ fDstInfo = dstInfo;
fOptions = *options;
return kSuccess;
}
-#undef CHECK_COLOR_TABLE
-
-SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& info) {
- return this->startScanlineDecode(info, nullptr, nullptr, nullptr);
+SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& dstInfo) {
+ return this->startScanlineDecode(dstInfo, nullptr, nullptr, nullptr);
}
int SkCodec::getScanlines(void* dst, int countLines, size_t rowBytes) {
@@ -392,6 +331,7 @@ int SkCodec::outputScanline(int inputScanline) const {
int SkCodec::onOutputScanline(int inputScanline) const {
switch (this->getScanlineOrder()) {
case kTopDown_SkScanlineOrder:
+ case kNone_SkScanlineOrder:
return inputScanline;
case kBottomUp_SkScanlineOrder:
return this->getInfo().height() - inputScanline - 1;
@@ -425,7 +365,8 @@ void SkCodec::fillIncompleteImage(const SkImageInfo& info, void* dst, size_t row
}
switch (this->getScanlineOrder()) {
- case kTopDown_SkScanlineOrder: {
+ case kTopDown_SkScanlineOrder:
+ case kNone_SkScanlineOrder: {
const SkImageInfo fillInfo = info.makeWH(fillWidth, linesRemaining);
fillDst = SkTAddOffset<void>(dst, linesDecoded * rowBytes);
fill_proc(fillInfo, fillDst, rowBytes, fillValue, zeroInit, sampler);
diff --git a/src/codec/SkGifCodec.cpp b/src/codec/SkGifCodec.cpp
index dcc25b8dfd..75e9d63fa7 100644
--- a/src/codec/SkGifCodec.cpp
+++ b/src/codec/SkGifCodec.cpp
@@ -520,7 +520,7 @@ uint32_t SkGifCodec::onGetFillValue(SkColorType colorType) const {
SkCodec::Result SkGifCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& opts, SkPMColor inputColorPtr[], int* inputColorCount) {
- return this->prepareToDecode(dstInfo, inputColorPtr, inputColorCount, opts);
+ return this->prepareToDecode(dstInfo, inputColorPtr, inputColorCount, this->options());
}
void SkGifCodec::handleScanlineFrame(int count, int* rowsBeforeFrame, int* rowsInFrame) {
diff --git a/src/codec/SkIcoCodec.cpp b/src/codec/SkIcoCodec.cpp
index a80b9df3cf..0e81b72407 100644
--- a/src/codec/SkIcoCodec.cpp
+++ b/src/codec/SkIcoCodec.cpp
@@ -15,7 +15,6 @@
#include "SkTDArray.h"
#include "SkTSort.h"
-#ifdef SK_HAS_PNG_LIBRARY
/*
* Checks the start of the stream to see if the image is an Ico or Cur
*/
@@ -187,7 +186,6 @@ SkIcoCodec::SkIcoCodec(int width, int height, const SkEncodedInfo& info,
: INHERITED(width, height, info, nullptr)
, fEmbeddedCodecs(codecs)
, fCurrScanlineCodec(nullptr)
- , fCurrIncrementalCodec(nullptr)
{}
/*
@@ -291,7 +289,6 @@ SkCodec::Result SkIcoCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
result = embeddedCodec->startScanlineDecode(dstInfo, &options, colorTable, colorCount);
if (kSuccess == result) {
fCurrScanlineCodec = embeddedCodec;
- fCurrIncrementalCodec = nullptr;
return result;
}
@@ -312,83 +309,13 @@ bool SkIcoCodec::onSkipScanlines(int count) {
return fCurrScanlineCodec->skipScanlines(count);
}
-SkCodec::Result SkIcoCodec::onStartIncrementalDecode(const SkImageInfo& dstInfo,
- void* pixels, size_t rowBytes, const SkCodec::Options& options,
- SkPMColor* colorTable, int* colorCount) {
- int index = 0;
- while (true) {
- index = this->chooseCodec(dstInfo.dimensions(), index);
- if (index < 0) {
- break;
- }
-
- SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index);
- switch (embeddedCodec->startIncrementalDecode(dstInfo,
- pixels, rowBytes, &options, colorTable, colorCount)) {
- case kSuccess:
- fCurrIncrementalCodec = embeddedCodec;
- fCurrScanlineCodec = nullptr;
- return kSuccess;
- case kUnimplemented:
- // FIXME: embeddedCodec is a BMP. If scanline decoding would work,
- // return kUnimplemented so that SkSampledCodec will fall through
- // to use the scanline decoder.
- // Note that calling startScanlineDecode will require an extra
- // rewind. The embedded codec has an SkMemoryStream, which is
- // cheap to rewind, though it will do extra work re-reading the
- // header.
- // Also note that we pass nullptr for Options. This is because
- // Options that are valid for incremental decoding may not be
- // valid for scanline decoding.
- // Once BMP supports incremental decoding this workaround can go
- // away.
- if (embeddedCodec->startScanlineDecode(dstInfo, nullptr,
- colorTable, colorCount) == kSuccess) {
- return kUnimplemented;
- }
- // Move on to the next embedded codec.
- break;
- default:
- break;
- }
-
- index++;
- }
-
- SkCodecPrintf("Error: No matching candidate image in ico.\n");
- return kInvalidScale;
-}
-
-SkCodec::Result SkIcoCodec::onIncrementalDecode(int* rowsDecoded) {
- SkASSERT(fCurrIncrementalCodec);
- return fCurrIncrementalCodec->incrementalDecode(rowsDecoded);
-}
-
SkCodec::SkScanlineOrder SkIcoCodec::onGetScanlineOrder() const {
// FIXME: This function will possibly return the wrong value if it is called
- // before startScanlineDecode()/startIncrementalDecode().
- if (fCurrScanlineCodec) {
- SkASSERT(!fCurrIncrementalCodec);
- return fCurrScanlineCodec->getScanlineOrder();
- }
-
- if (fCurrIncrementalCodec) {
- return fCurrIncrementalCodec->getScanlineOrder();
- }
-
- return INHERITED::onGetScanlineOrder();
+ // before startScanlineDecode().
+ return fCurrScanlineCodec ? fCurrScanlineCodec->getScanlineOrder() :
+ INHERITED::onGetScanlineOrder();
}
SkSampler* SkIcoCodec::getSampler(bool createIfNecessary) {
- if (fCurrScanlineCodec) {
- SkASSERT(!fCurrIncrementalCodec);
- return fCurrScanlineCodec->getSampler(createIfNecessary);
- }
-
- if (fCurrIncrementalCodec) {
- return fCurrIncrementalCodec->getSampler(createIfNecessary);
- }
-
- return nullptr;
+ return fCurrScanlineCodec ? fCurrScanlineCodec->getSampler(createIfNecessary) : nullptr;
}
-#endif // SK_HAS_PNG_LIBRARY
diff --git a/src/codec/SkIcoCodec.h b/src/codec/SkIcoCodec.h
index a227d8c671..8c56aee4c6 100644
--- a/src/codec/SkIcoCodec.h
+++ b/src/codec/SkIcoCodec.h
@@ -54,11 +54,6 @@ private:
bool onSkipScanlines(int count) override;
- Result onStartIncrementalDecode(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes,
- const SkCodec::Options&, SkPMColor*, int*) override;
-
- Result onIncrementalDecode(int* rowsDecoded) override;
-
SkSampler* getSampler(bool createIfNecessary) override;
/*
@@ -89,13 +84,5 @@ private:
// SkAutoTDelete. It will be deleted by the destructor of fEmbeddedCodecs.
SkCodec* fCurrScanlineCodec;
- // Only used by incremental decoder. onStartIncrementalDecode() will set
- // fCurrIncrementalCodec to one of the fEmbeddedCodecs, if it can find a
- // codec of the appropriate size. We will use fCurrIncrementalCodec for
- // subsequent calls to incrementalDecode().
- // fCurrIncrementalCodec is owned by this class, but should not be an
- // SkAutoTDelete. It will be deleted by the destructor of fEmbeddedCodecs.
- SkCodec* fCurrIncrementalCodec;
-
typedef SkCodec INHERITED;
};
diff --git a/src/codec/SkPngCodec.cpp b/src/codec/SkPngCodec.cpp
index bab007399d..43d1580c17 100644
--- a/src/codec/SkPngCodec.cpp
+++ b/src/codec/SkPngCodec.cpp
@@ -19,27 +19,31 @@
#include "SkTemplates.h"
#include "SkUtils.h"
-#ifdef SK_HAS_PNG_LIBRARY
///////////////////////////////////////////////////////////////////////////////
// Callback functions
///////////////////////////////////////////////////////////////////////////////
-// When setjmp is first called, it returns 0, meaning longjmp was not called.
-constexpr int kSetJmpOkay = 0;
-// An error internal to libpng.
-constexpr int kPngError = 1;
-// Passed to longjmp when we have decoded as many lines as we need.
-constexpr int kStopDecoding = 2;
-
static void sk_error_fn(png_structp png_ptr, png_const_charp msg) {
SkCodecPrintf("------ png error %s\n", msg);
- longjmp(png_jmpbuf(png_ptr), kPngError);
+ longjmp(png_jmpbuf(png_ptr), 1);
}
void sk_warning_fn(png_structp, png_const_charp msg) {
SkCodecPrintf("----- png warning %s\n", msg);
}
+static void sk_read_fn(png_structp png_ptr, png_bytep data,
+ png_size_t length) {
+ SkStream* stream = static_cast<SkStream*>(png_get_io_ptr(png_ptr));
+ const size_t bytes = stream->read(data, length);
+ if (bytes != length) {
+ // FIXME: We want to report the fact that the stream was truncated.
+ // One way to do that might be to pass a enum to longjmp so setjmp can
+ // specify the failure.
+ png_error(png_ptr, "Read Error!");
+ }
+}
+
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
static int sk_read_user_chunk(png_structp png_ptr, png_unknown_chunkp chunk) {
SkPngChunkReader* chunkReader = (SkPngChunkReader*)png_get_user_chunk_ptr(png_ptr);
@@ -54,21 +58,9 @@ static int sk_read_user_chunk(png_structp png_ptr, png_unknown_chunkp chunk) {
class AutoCleanPng : public SkNoncopyable {
public:
- /*
- * This class does not take ownership of stream or reader, but if codecPtr
- * is non-NULL, and decodeBounds succeeds, it will have created a new
- * SkCodec (pointed to by *codecPtr) which will own/ref them, as well as
- * the png_ptr and info_ptr.
- */
- AutoCleanPng(png_structp png_ptr, SkStream* stream, SkPngChunkReader* reader,
- SkCodec** codecPtr)
+ AutoCleanPng(png_structp png_ptr)
: fPng_ptr(png_ptr)
- , fInfo_ptr(nullptr)
- , fDecodedBounds(false)
- , fStream(stream)
- , fChunkReader(reader)
- , fOutCodec(codecPtr)
- {}
+ , fInfo_ptr(nullptr) {}
~AutoCleanPng() {
// fInfo_ptr will never be non-nullptr unless fPng_ptr is.
@@ -83,116 +75,20 @@ public:
fInfo_ptr = info_ptr;
}
- /**
- * Reads enough of the input stream to decode the bounds.
- * @return false if the stream is not a valid PNG (or too short).
- * true if it read enough of the stream to determine the bounds.
- * In the latter case, the stream may have been read beyond the
- * point to determine the bounds, and the png_ptr will have saved
- * any extra data. Further, if the codecPtr supplied to the
- * constructor was not NULL, it will now point to a new SkCodec,
- * which owns (or refs, in the case of the SkPngChunkReader) the
- * inputs. If codecPtr was NULL, the png_ptr and info_ptr are
- * unowned, and it is up to the caller to destroy them.
- */
- bool decodeBounds();
-
-private:
- png_structp fPng_ptr;
- png_infop fInfo_ptr;
- bool fDecodedBounds;
- SkStream* fStream;
- SkPngChunkReader* fChunkReader;
- SkCodec** fOutCodec;
-
- /**
- * Supplied to libpng to call when it has read enough data to determine
- * bounds.
- */
- static void InfoCallback(png_structp png_ptr, png_infop info_ptr) {
- // png_get_progressive_ptr returns the pointer we set on the png_ptr with
- // png_set_progressive_read_fn
- static_cast<AutoCleanPng*>(png_get_progressive_ptr(png_ptr))->infoCallback();
- }
-
- void infoCallback();
-
- void releasePngPtrs() {
+ void release() {
fPng_ptr = nullptr;
fInfo_ptr = nullptr;
}
+
+private:
+ png_structp fPng_ptr;
+ png_infop fInfo_ptr;
};
#define AutoCleanPng(...) SK_REQUIRE_LOCAL_VAR(AutoCleanPng)
-bool AutoCleanPng::decodeBounds() {
- if (setjmp(png_jmpbuf(fPng_ptr))) {
- return false;
- }
-
- png_set_progressive_read_fn(fPng_ptr, this, InfoCallback, nullptr, nullptr);
-
- // Arbitrary buffer size, though note that it matches (below)
- // SkPngCodec::processData(). FIXME: Can we better suit this to the size of
- // the PNG header?
- constexpr size_t kBufferSize = 4096;
- char buffer[kBufferSize];
-
- while (true) {
- const size_t bytesRead = fStream->read(buffer, kBufferSize);
- if (!bytesRead) {
- // We have read to the end of the input without decoding bounds.
- break;
- }
-
- png_process_data(fPng_ptr, fInfo_ptr, (png_bytep) buffer, bytesRead);
- if (fDecodedBounds) {
- break;
- }
- }
-
- // For safety, clear the pointer to this object.
- png_set_progressive_read_fn(fPng_ptr, nullptr, nullptr, nullptr, nullptr);
- return fDecodedBounds;
-}
-
-void SkPngCodec::processData() {
- switch (setjmp(png_jmpbuf(fPng_ptr))) {
- case kPngError:
- // There was an error. Stop processing data.
- // FIXME: Do we need to discard png_ptr?
- return;
- case kStopDecoding:
- // We decoded all the lines we want.
- return;
- case kSetJmpOkay:
- // Everything is okay.
- break;
- default:
- // No other values should be passed to longjmp.
- SkASSERT(false);
- }
-
- // Arbitrary buffer size
- constexpr size_t kBufferSize = 4096;
- char buffer[kBufferSize];
-
- while (true) {
- const size_t bytesRead = this->stream()->read(buffer, kBufferSize);
- png_process_data(fPng_ptr, fInfo_ptr, (png_bytep) buffer, bytesRead);
-
- if (!bytesRead) {
- // We have read to the end of the input. Note that we quit *after*
- // calling png_process_data, because decodeBounds may have told
- // libpng to save the remainder of the buffer, in which case
- // png_process_data will process the saved buffer, though the
- // stream has no more to read.
- break;
- }
- }
-}
-
// Note: SkColorTable claims to store SkPMColors, which is not necessarily
// the case here.
+// TODO: If we add support for non-native swizzles, we'll need to handle that here.
bool SkPngCodec::createColorTable(SkColorType dstColorType, bool premultiply, int* ctableCount) {
int numColors;
@@ -371,254 +267,204 @@ sk_sp<SkColorSpace> read_color_space(png_structp png_ptr, png_infop info_ptr) {
return nullptr;
}
-class SkPngNormalDecoder : public SkPngCodec {
+static int bytes_per_pixel(int bitsPerPixel) {
+ // Note that we will have to change this implementation if we start
+ // supporting outputs from libpng that are less than 8-bits per component.
+ return bitsPerPixel / 8;
+}
+
+// Subclass of SkPngCodec which supports scanline decoding
+class SkPngScanlineDecoder : public SkPngCodec {
public:
- SkPngNormalDecoder(int width, int height, const SkEncodedInfo& info, SkStream* stream,
- SkPngChunkReader* reader, png_structp png_ptr, png_infop info_ptr, int bitDepth,
+ SkPngScanlineDecoder(int width, int height, const SkEncodedInfo& info, SkStream* stream,
+ SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr, int bitDepth,
sk_sp<SkColorSpace> colorSpace)
- : INHERITED(width, height, info, stream, reader, png_ptr, info_ptr, bitDepth,
- std::move(colorSpace))
- , fLinesDecoded(0)
- , fDst(nullptr)
- , fRowBytes(0)
- , fFirstRow(0)
- , fLastRow(0)
+ : INHERITED(width, height, info, stream, chunkReader, png_ptr, info_ptr, bitDepth, 1,
+ colorSpace)
+ , fSrcRow(nullptr)
{}
- static void AllRowsCallback(png_structp png_ptr, png_bytep row, png_uint_32 rowNum, int /*pass*/) {
- GetDecoder(png_ptr)->allRowsCallback(row, rowNum);
- }
-
- static void RowCallback(png_structp png_ptr, png_bytep row, png_uint_32 rowNum, int /*pass*/) {
- GetDecoder(png_ptr)->rowCallback(row, rowNum);
- }
-private:
- int fLinesDecoded; // FIXME: Move to baseclass?
- void* fDst;
- size_t fRowBytes;
-
- // Variables for partial decode
- int fFirstRow; // FIXME: Move to baseclass?
- int fLastRow;
-
- typedef SkPngCodec INHERITED;
-
- static SkPngNormalDecoder* GetDecoder(png_structp png_ptr) {
- return static_cast<SkPngNormalDecoder*>(png_get_progressive_ptr(png_ptr));
- }
-
- Result decodeAllRows(void* dst, size_t rowBytes, int* rowsDecoded) override {
- const int height = this->getInfo().height();
- png_set_progressive_read_fn(this->png_ptr(), this, nullptr, AllRowsCallback, nullptr);
- fDst = dst;
- fRowBytes = rowBytes;
-
- fLinesDecoded = 0;
-
- this->processData();
-
- if (fLinesDecoded == height) {
- return SkCodec::kSuccess;
+ Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options,
+ SkPMColor ctable[], int* ctableCount) override {
+ if (!conversion_possible(dstInfo, this->getInfo())) {
+ return kInvalidConversion;
}
- if (rowsDecoded) {
- *rowsDecoded = fLinesDecoded;
+ const Result result = this->initializeSwizzler(dstInfo, options, ctable,
+ ctableCount);
+ if (result != kSuccess) {
+ return result;
}
- return SkCodec::kIncompleteInput;
- }
+ fStorage.reset(this->getInfo().width() *
+ (bytes_per_pixel(this->getEncodedInfo().bitsPerPixel())));
+ fSrcRow = fStorage.get();
- void allRowsCallback(png_bytep row, int rowNum) {
- SkASSERT(rowNum - fFirstRow == fLinesDecoded);
- fLinesDecoded++;
- this->swizzler()->swizzle(fDst, row);
- fDst = SkTAddOffset<void>(fDst, fRowBytes);
+ return kSuccess;
}
- void setRange(int firstRow, int lastRow, void* dst, size_t rowBytes) override {
- png_set_progressive_read_fn(this->png_ptr(), this, nullptr, RowCallback, nullptr);
- fFirstRow = firstRow;
- fLastRow = lastRow;
- fDst = dst;
- fRowBytes = rowBytes;
- fLinesDecoded = 0;
- }
-
- SkCodec::Result decode(int* rowsDecoded) override {
- this->processData();
-
- if (fLinesDecoded == fLastRow - fFirstRow + 1) {
- return SkCodec::kSuccess;
+ int onGetScanlines(void* dst, int count, size_t rowBytes) override {
+ // Assume that an error in libpng indicates an incomplete input.
+ int row = 0;
+ if (setjmp(png_jmpbuf(this->png_ptr()))) {
+ SkCodecPrintf("setjmp long jump!\n");
+ return row;
}
- if (rowsDecoded) {
- *rowsDecoded = fLinesDecoded;
+ void* dstRow = dst;
+ for (; row < count; row++) {
+ png_read_row(this->png_ptr(), fSrcRow, nullptr);
+ this->swizzler()->swizzle(dstRow, fSrcRow);
+ dstRow = SkTAddOffset<void>(dstRow, rowBytes);
}
- return SkCodec::kIncompleteInput;
+ return row;
}
- void rowCallback(png_bytep row, int rowNum) {
- if (rowNum < fFirstRow) {
- // Ignore this row.
- return;
- }
-
- SkASSERT(rowNum <= fLastRow);
-
- if (this->swizzler()->rowNeeded(fLinesDecoded)) {
- this->swizzler()->swizzle(fDst, row);
- fDst = SkTAddOffset<void>(fDst, fRowBytes);
+ bool onSkipScanlines(int count) override {
+ // Assume that an error in libpng indicates an incomplete input.
+ if (setjmp(png_jmpbuf(this->png_ptr()))) {
+ SkCodecPrintf("setjmp long jump!\n");
+ return false;
}
- fLinesDecoded++;
-
- if (rowNum == fLastRow) {
- // Fake error to stop decoding scanlines.
- longjmp(png_jmpbuf(this->png_ptr()), kStopDecoding);
+ for (int row = 0; row < count; row++) {
+ png_read_row(this->png_ptr(), fSrcRow, nullptr);
}
- }
-};
-
-class SkPngInterlacedDecoder : public SkPngCodec {
-public:
- SkPngInterlacedDecoder(int width, int height, const SkEncodedInfo& info, SkStream* stream,
- SkPngChunkReader* reader, png_structp png_ptr, png_infop info_ptr, int bitDepth,
- sk_sp<SkColorSpace> colorSpace, int numberPasses)
- : INHERITED(width, height, info, stream, reader, png_ptr, info_ptr, bitDepth,
- std::move(colorSpace))
- , fNumberPasses(numberPasses)
- , fFirstRow(0)
- , fLastRow(0)
- , fLinesDecoded(0)
- , fInterlacedComplete(false)
- , fPng_rowbytes(0)
- {}
-
- static void InterlacedRowCallback(png_structp png_ptr, png_bytep row, png_uint_32 rowNum, int pass) {
- auto decoder = static_cast<SkPngInterlacedDecoder*>(png_get_progressive_ptr(png_ptr));
- decoder->interlacedRowCallback(row, rowNum, pass);
+ return true;
}
private:
- const int fNumberPasses;
- int fFirstRow;
- int fLastRow;
- void* fDst;
- size_t fRowBytes;
- int fLinesDecoded;
- bool fInterlacedComplete;
- size_t fPng_rowbytes;
- SkAutoTMalloc<png_byte> fInterlaceBuffer;
+ SkAutoTMalloc<uint8_t> fStorage;
+ uint8_t* fSrcRow;
typedef SkPngCodec INHERITED;
+};
- // FIXME: Currently sharing interlaced callback for all rows and subset. It's not
- // as expensive as the subset version of non-interlaced, but it still does extra
- // work.
- void interlacedRowCallback(png_bytep row, int rowNum, int pass) {
- if (rowNum < fFirstRow || rowNum > fLastRow) {
- // Ignore this row
- return;
- }
- png_bytep oldRow = fInterlaceBuffer.get() + (rowNum - fFirstRow) * fPng_rowbytes;
- png_progressive_combine_row(this->png_ptr(), oldRow, row);
+class SkPngInterlacedScanlineDecoder : public SkPngCodec {
+public:
+ SkPngInterlacedScanlineDecoder(int width, int height, const SkEncodedInfo& info,
+ SkStream* stream, SkPngChunkReader* chunkReader, png_structp png_ptr,
+ png_infop info_ptr, int bitDepth, int numberPasses, sk_sp<SkColorSpace> colorSpace)
+ : INHERITED(width, height, info, stream, chunkReader, png_ptr, info_ptr, bitDepth,
+ numberPasses, colorSpace)
+ , fHeight(-1)
+ , fCanSkipRewind(false)
+ {
+ SkASSERT(numberPasses != 1);
+ }
+
+ Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options,
+ SkPMColor ctable[], int* ctableCount) override {
+ if (!conversion_possible(dstInfo, this->getInfo())) {
+ return kInvalidConversion;
+ }
- if (0 == pass) {
- // The first pass initializes all rows.
- SkASSERT(row);
- SkASSERT(fLinesDecoded == rowNum - fFirstRow);
- fLinesDecoded++;
- } else {
- SkASSERT(fLinesDecoded == fLastRow - fFirstRow + 1);
- if (fNumberPasses - 1 == pass && rowNum == fLastRow) {
- // Last pass, and we have read all of the rows we care about. Note that
- // we do not care about reading anything beyond the end of the image (or
- // beyond the last scanline requested).
- fInterlacedComplete = true;
- // Fake error to stop decoding scanlines.
- longjmp(png_jmpbuf(this->png_ptr()), kStopDecoding);
- }
+ const Result result = this->initializeSwizzler(dstInfo, options, ctable,
+ ctableCount);
+ if (result != kSuccess) {
+ return result;
}
- }
- SkCodec::Result decodeAllRows(void* dst, size_t rowBytes, int* rowsDecoded) override {
- const int height = this->getInfo().height();
- this->setUpInterlaceBuffer(height);
- png_set_progressive_read_fn(this->png_ptr(), this, nullptr, InterlacedRowCallback, nullptr);
+ fHeight = dstInfo.height();
+ // FIXME: This need not be called on a second call to onStartScanlineDecode.
+ fSrcRowBytes = this->getInfo().width() *
+ (bytes_per_pixel(this->getEncodedInfo().bitsPerPixel()));
+ fGarbageRow.reset(fSrcRowBytes);
+ fGarbageRowPtr = static_cast<uint8_t*>(fGarbageRow.get());
+ fCanSkipRewind = true;
- fFirstRow = 0;
- fLastRow = height - 1;
- fLinesDecoded = 0;
+ return SkCodec::kSuccess;
+ }
- this->processData();
+ int onGetScanlines(void* dst, int count, size_t dstRowBytes) override {
+ // rewind stream if have previously called onGetScanlines,
+ // since we need entire progressive image to get scanlines
+ if (fCanSkipRewind) {
+ // We already rewound in onStartScanlineDecode, so there is no reason to rewind.
+ // Next time onGetScanlines is called, we will need to rewind.
+ fCanSkipRewind = false;
+ } else {
+ // rewindIfNeeded resets fCurrScanline, since it assumes that start
+ // needs to be called again before scanline decoding. PNG scanline
+ // decoding is the exception, since it needs to rewind between
+ // calls to getScanlines. Keep track of fCurrScanline, to undo the
+ // reset.
+ const int currScanline = this->nextScanline();
+ // This method would never be called if currScanline is -1
+ SkASSERT(currScanline != -1);
+
+ if (!this->rewindIfNeeded()) {
+ return kCouldNotRewind;
+ }
+ this->updateCurrScanline(currScanline);
+ }
- png_bytep srcRow = fInterlaceBuffer.get();
- // FIXME: When resuming, this may rewrite rows that did not change.
- for (int rowNum = 0; rowNum < fLinesDecoded; rowNum++) {
- this->swizzler()->swizzle(dst, srcRow);
- dst = SkTAddOffset<void>(dst, rowBytes);
- srcRow = SkTAddOffset<png_byte>(srcRow, fPng_rowbytes);
+ if (setjmp(png_jmpbuf(this->png_ptr()))) {
+ SkCodecPrintf("setjmp long jump!\n");
+ // FIXME (msarett): Returning 0 is pessimistic. If we can complete a single pass,
+ // we may be able to report that all of the memory has been initialized. Even if we
+ // fail on the first pass, we can still report than some scanlines are initialized.
+ return 0;
}
- if (fInterlacedComplete) {
- return SkCodec::kSuccess;
+ SkAutoTMalloc<uint8_t> storage(count * fSrcRowBytes);
+ uint8_t* storagePtr = storage.get();
+ uint8_t* srcRow;
+ const int startRow = this->nextScanline();
+ for (int i = 0; i < this->numberPasses(); i++) {
+ // read rows we planned to skip into garbage row
+ for (int y = 0; y < startRow; y++){
+ png_read_row(this->png_ptr(), fGarbageRowPtr, nullptr);
+ }
+ // read rows we care about into buffer
+ srcRow = storagePtr;
+ for (int y = 0; y < count; y++) {
+ png_read_row(this->png_ptr(), srcRow, nullptr);
+ srcRow += fSrcRowBytes;
+ }
+ // read rows we don't want into garbage buffer
+ for (int y = 0; y < fHeight - startRow - count; y++) {
+ png_read_row(this->png_ptr(), fGarbageRowPtr, nullptr);
+ }
}
-
- if (rowsDecoded) {
- *rowsDecoded = fLinesDecoded;
+ //swizzle the rows we care about
+ srcRow = storagePtr;
+ void* dstRow = dst;
+ for (int y = 0; y < count; y++) {
+ this->swizzler()->swizzle(dstRow, srcRow);
+ dstRow = SkTAddOffset<void>(dstRow, dstRowBytes);
+ srcRow += fSrcRowBytes;
}
- return SkCodec::kIncompleteInput;
+ return count;
}
- void setRange(int firstRow, int lastRow, void* dst, size_t rowBytes) override {
- // FIXME: We could skip rows in the interlace buffer that we won't put in the output.
- this->setUpInterlaceBuffer(lastRow - firstRow + 1);
- png_set_progressive_read_fn(this->png_ptr(), this, nullptr, InterlacedRowCallback, nullptr);
- fFirstRow = firstRow;
- fLastRow = lastRow;
- fDst = dst;
- fRowBytes = rowBytes;
- fLinesDecoded = 0;
+ bool onSkipScanlines(int count) override {
+ // The non-virtual version will update fCurrScanline.
+ return true;
}
- SkCodec::Result decode(int* rowsDecoded) override {
- this->processData();
-
- // Now call the callback on all the rows that were decoded.
- if (!fLinesDecoded) {
- return SkCodec::kIncompleteInput;
- }
- const int lastRow = fLinesDecoded + fFirstRow - 1;
- SkASSERT(lastRow <= fLastRow);
-
- // FIXME: For resuming interlace, we may swizzle a row that hasn't changed. But it
- // may be too tricky/expensive to handle that correctly.
- png_bytep srcRow = fInterlaceBuffer.get();
- const int sampleY = this->swizzler()->sampleY();
- void* dst = fDst;
- for (int rowNum = fFirstRow; rowNum <= lastRow; rowNum += sampleY) {
- this->swizzler()->swizzle(dst, srcRow);
- dst = SkTAddOffset<void>(dst, fRowBytes);
- srcRow = SkTAddOffset<png_byte>(srcRow, fPng_rowbytes * sampleY);
- }
-
- if (fInterlacedComplete) {
- return SkCodec::kSuccess;
- }
-
- if (rowsDecoded) {
- *rowsDecoded = fLinesDecoded;
- }
- return SkCodec::kIncompleteInput;
+ SkScanlineOrder onGetScanlineOrder() const override {
+ return kNone_SkScanlineOrder;
}
- void setUpInterlaceBuffer(int height) {
- fPng_rowbytes = png_get_rowbytes(this->png_ptr(), this->info_ptr());
- fInterlaceBuffer.reset(fPng_rowbytes * height);
- fInterlacedComplete = false;
- }
+private:
+ int fHeight;
+ size_t fSrcRowBytes;
+ SkAutoMalloc fGarbageRow;
+ uint8_t* fGarbageRowPtr;
+ // FIXME: This imitates behavior in SkCodec::rewindIfNeeded. That function
+ // is called whenever some action is taken that reads the stream and
+ // therefore the next call will require a rewind. So it modifies a boolean
+ // to note that the *next* time it is called a rewind is needed.
+ // SkPngInterlacedScanlineDecoder has an extra wrinkle - calling
+ // onStartScanlineDecode followed by onGetScanlines does *not* require a
+ // rewind. Since rewindIfNeeded does not have this flexibility, we need to
+ // add another layer.
+ bool fCanSkipRewind;
+
+ typedef SkPngCodec INHERITED;
};
// Reads the header and initializes the output fields, if not NULL.
@@ -646,7 +492,7 @@ static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader, SkCodec
return false;
}
- AutoCleanPng autoClean(png_ptr, stream, chunkReader, outCodec);
+ AutoCleanPng autoClean(png_ptr);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == nullptr) {
@@ -661,6 +507,8 @@ static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader, SkCodec
return false;
}
+ png_set_read_fn(png_ptr, static_cast<void*>(stream), sk_read_fn);
+
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
// Hookup our chunkReader so we can see any user-chunks the caller may be interested in.
// This needs to be installed before we read the png header. Android may store ninepatch
@@ -671,31 +519,12 @@ static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader, SkCodec
}
#endif
- const bool decodedBounds = autoClean.decodeBounds();
-
- if (!decodedBounds) {
- return false;
- }
-
- // On success, decodeBounds releases ownership of png_ptr and info_ptr.
- if (png_ptrp) {
- *png_ptrp = png_ptr;
- }
- if (info_ptrp) {
- *info_ptrp = info_ptr;
- }
-
- // decodeBounds takes care of setting outCodec
- if (outCodec) {
- SkASSERT(*outCodec);
- }
- return true;
-}
-
-void AutoCleanPng::infoCallback() {
+ // The call to png_read_info() gives us all of the information from the
+ // PNG file before the first IDAT (image data chunk).
+ png_read_info(png_ptr, info_ptr);
png_uint_32 origWidth, origHeight;
int bitDepth, encodedColorType;
- png_get_IHDR(fPng_ptr, fInfo_ptr, &origWidth, &origHeight, &bitDepth,
+ png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bitDepth,
&encodedColorType, nullptr, nullptr, nullptr);
// Tell libpng to strip 16 bit/color files down to 8 bits/color.
@@ -703,7 +532,7 @@ void AutoCleanPng::infoCallback() {
// RAW decodes?
if (bitDepth == 16) {
SkASSERT(PNG_COLOR_TYPE_PALETTE != encodedColorType);
- png_set_strip_16(fPng_ptr);
+ png_set_strip_16(png_ptr);
}
// Now determine the default colorType and alphaType and set the required transforms.
@@ -717,18 +546,18 @@ void AutoCleanPng::infoCallback() {
// byte into separate bytes (useful for paletted and grayscale images).
if (bitDepth < 8) {
// TODO: Should we use SkSwizzler here?
- png_set_packing(fPng_ptr);
+ png_set_packing(png_ptr);
}
color = SkEncodedInfo::kPalette_Color;
// Set the alpha depending on if a transparency chunk exists.
- alpha = png_get_valid(fPng_ptr, fInfo_ptr, PNG_INFO_tRNS) ?
+ alpha = png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ?
SkEncodedInfo::kUnpremul_Alpha : SkEncodedInfo::kOpaque_Alpha;
break;
case PNG_COLOR_TYPE_RGB:
- if (png_get_valid(fPng_ptr, fInfo_ptr, PNG_INFO_tRNS)) {
+ if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
// Convert to RGBA if transparency chunk exists.
- png_set_tRNS_to_alpha(fPng_ptr);
+ png_set_tRNS_to_alpha(png_ptr);
color = SkEncodedInfo::kRGBA_Color;
alpha = SkEncodedInfo::kBinary_Alpha;
} else {
@@ -740,11 +569,11 @@ void AutoCleanPng::infoCallback() {
// Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel.
if (bitDepth < 8) {
// TODO: Should we use SkSwizzler here?
- png_set_expand_gray_1_2_4_to_8(fPng_ptr);
+ png_set_expand_gray_1_2_4_to_8(png_ptr);
}
- if (png_get_valid(fPng_ptr, fInfo_ptr, PNG_INFO_tRNS)) {
- png_set_tRNS_to_alpha(fPng_ptr);
+ if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
+ png_set_tRNS_to_alpha(png_ptr);
color = SkEncodedInfo::kGrayAlpha_Color;
alpha = SkEncodedInfo::kBinary_Alpha;
} else {
@@ -767,43 +596,45 @@ void AutoCleanPng::infoCallback() {
alpha = SkEncodedInfo::kUnpremul_Alpha;
}
- const int numberPasses = png_set_interlace_handling(fPng_ptr);
+ int numberPasses = png_set_interlace_handling(png_ptr);
+
+ autoClean.release();
+ if (png_ptrp) {
+ *png_ptrp = png_ptr;
+ }
+ if (info_ptrp) {
+ *info_ptrp = info_ptr;
+ }
- if (fOutCodec) {
- SkASSERT(nullptr == *fOutCodec);
- sk_sp<SkColorSpace> colorSpace = read_color_space(fPng_ptr, fInfo_ptr);
+ if (outCodec) {
+ sk_sp<SkColorSpace> colorSpace = read_color_space(png_ptr, info_ptr);
if (!colorSpace) {
// Treat unmarked pngs as sRGB.
colorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
}
+
SkEncodedInfo info = SkEncodedInfo::Make(color, alpha, 8);
+
if (1 == numberPasses) {
- *fOutCodec = new SkPngNormalDecoder(origWidth, origHeight, info, fStream,
- fChunkReader, fPng_ptr, fInfo_ptr, bitDepth, std::move(colorSpace));
+ *outCodec = new SkPngScanlineDecoder(origWidth, origHeight, info, stream,
+ chunkReader, png_ptr, info_ptr, bitDepth, colorSpace);
} else {
- *fOutCodec = new SkPngInterlacedDecoder(origWidth, origHeight, info, fStream,
- fChunkReader, fPng_ptr, fInfo_ptr, bitDepth, std::move(colorSpace),
- numberPasses);
+ *outCodec = new SkPngInterlacedScanlineDecoder(origWidth, origHeight, info, stream,
+ chunkReader, png_ptr, info_ptr, bitDepth, numberPasses, colorSpace);
}
}
- fDecodedBounds = true;
- // 1 tells libpng to save any extra data. We may be able to be more efficient by saving
- // it ourselves.
- png_process_data_pause(fPng_ptr, 1);
-
- // Release the pointers, which are now owned by the codec or the caller is expected to
- // take ownership.
- this->releasePngPtrs();
+ return true;
}
SkPngCodec::SkPngCodec(int width, int height, const SkEncodedInfo& info, SkStream* stream,
SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr,
- int bitDepth, sk_sp<SkColorSpace> colorSpace)
+ int bitDepth, int numberPasses, sk_sp<SkColorSpace> colorSpace)
: INHERITED(width, height, info, stream, colorSpace)
, fPngChunkReader(SkSafeRef(chunkReader))
, fPng_ptr(png_ptr)
, fInfo_ptr(info_ptr)
+ , fNumberPasses(numberPasses)
, fBitDepth(bitDepth)
{}
@@ -825,19 +656,22 @@ void SkPngCodec::destroyReadStruct() {
// Getting the pixels
///////////////////////////////////////////////////////////////////////////////
-bool SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo,
- const Options& options,
- SkPMColor ctable[],
- int* ctableCount) {
+SkCodec::Result SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo,
+ const Options& options,
+ SkPMColor ctable[],
+ int* ctableCount) {
+ // FIXME: Could we use the return value of setjmp to specify the type of
+ // error?
if (setjmp(png_jmpbuf(fPng_ptr))) {
- return false;
+ SkCodecPrintf("setjmp long jump!\n");
+ return kInvalidInput;
}
png_read_update_info(fPng_ptr, fInfo_ptr);
if (SkEncodedInfo::kPalette_Color == this->getEncodedInfo().color()) {
if (!this->createColorTable(requestedInfo.colorType(),
kPremul_SkAlphaType == requestedInfo.alphaType(), ctableCount)) {
- return false;
+ return kInvalidInput;
}
}
@@ -850,7 +684,7 @@ bool SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo,
options));
SkASSERT(fSwizzler);
- return true;
+ return kSuccess;
}
@@ -886,38 +720,77 @@ SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
}
// Note that ctable and ctableCount may be modified if there is a color table
- if (!this->initializeSwizzler(requestedInfo, options, ctable, ctableCount)) {
- return kInvalidInput; // or parameters?
+ const Result result = this->initializeSwizzler(requestedInfo, options, ctable, ctableCount);
+ if (result != kSuccess) {
+ return result;
}
- return this->decodeAllRows(dst, dstRowBytes, rowsDecoded);
-}
+ const int width = requestedInfo.width();
+ const int height = requestedInfo.height();
+ const int bpp = bytes_per_pixel(this->getEncodedInfo().bitsPerPixel());
+ const size_t srcRowBytes = width * bpp;
-SkCodec::Result SkPngCodec::onStartIncrementalDecode(const SkImageInfo& dstInfo,
- void* dst, size_t rowBytes, const SkCodec::Options& options,
- SkPMColor* ctable, int* ctableCount) {
- if (!conversion_possible(dstInfo, this->getInfo())) {
- return kInvalidConversion;
- }
-
- if (!this->initializeSwizzler(dstInfo, options, ctable, ctableCount)) {
- return kInvalidInput;
- }
+ // FIXME: Could we use the return value of setjmp to specify the type of
+ // error?
+ int row = 0;
+ // This must be declared above the call to setjmp to avoid memory leaks on incomplete images.
+ SkAutoTMalloc<uint8_t> storage;
+ if (setjmp(png_jmpbuf(fPng_ptr))) {
+ // Assume that any error that occurs while reading rows is caused by an incomplete input.
+ if (fNumberPasses > 1) {
+ // FIXME (msarett): Handle incomplete interlaced pngs.
+ return (row == height) ? kSuccess : kInvalidInput;
+ }
+ // FIXME: We do a poor job on incomplete pngs compared to other decoders (ex: Chromium,
+ // Ubuntu Image Viewer). This is because we use the default buffer size in libpng (8192
+ // bytes), and if we can't fill the buffer, we immediately fail.
+ // For example, if we try to read 8192 bytes, and the image (incorrectly) only contains
+ // half that, which may have been enough to contain a non-zero number of lines, we fail
+ // when we could have decoded a few more lines and then failed.
+ // The read function that we provide for libpng has no way of indicating that we have
+ // made a partial read.
+ // Making our buffer size smaller improves our incomplete decodes, but what impact does
+ // it have on regular decode performance? Should we investigate using a different API
+ // instead of png_read_row? Chromium uses png_process_data.
+ *rowsDecoded = row;
+ return (row == height) ? kSuccess : kIncompleteInput;
+ }
+
+ // FIXME: We could split these out based on subclass.
+ void* dstRow = dst;
+ if (fNumberPasses > 1) {
+ storage.reset(height * srcRowBytes);
+ uint8_t* const base = storage.get();
+
+ for (int i = 0; i < fNumberPasses; i++) {
+ uint8_t* srcRow = base;
+ for (int y = 0; y < height; y++) {
+ png_read_row(fPng_ptr, srcRow, nullptr);
+ srcRow += srcRowBytes;
+ }
+ }
- int firstRow, lastRow;
- if (options.fSubset) {
- firstRow = options.fSubset->top();
- lastRow = options.fSubset->bottom() - 1;
+ // Now swizzle it.
+ uint8_t* srcRow = base;
+ for (; row < height; row++) {
+ fSwizzler->swizzle(dstRow, srcRow);
+ dstRow = SkTAddOffset<void>(dstRow, dstRowBytes);
+ srcRow += srcRowBytes;
+ }
} else {
- firstRow = 0;
- lastRow = dstInfo.height() - 1;
+ storage.reset(srcRowBytes);
+ uint8_t* srcRow = storage.get();
+ for (; row < height; row++) {
+ png_read_row(fPng_ptr, srcRow, nullptr);
+ fSwizzler->swizzle(dstRow, srcRow);
+ dstRow = SkTAddOffset<void>(dstRow, dstRowBytes);
+ }
}
- this->setRange(firstRow, lastRow, dst, rowBytes);
- return kSuccess;
-}
-SkCodec::Result SkPngCodec::onIncrementalDecode(int* rowsDecoded) {
- return this->decode(rowsDecoded);
+ // read rest of file, and get additional comment and time chunks in info_ptr
+ png_read_end(fPng_ptr, fInfo_ptr);
+
+ return kSuccess;
}
uint32_t SkPngCodec::onGetFillValue(SkColorType colorType) const {
@@ -931,7 +804,7 @@ uint32_t SkPngCodec::onGetFillValue(SkColorType colorType) const {
SkCodec* SkPngCodec::NewFromStream(SkStream* stream, SkPngChunkReader* chunkReader) {
SkAutoTDelete<SkStream> streamDeleter(stream);
- SkCodec* outCodec = nullptr;
+ SkCodec* outCodec;
if (read_header(stream, chunkReader, &outCodec, nullptr, nullptr)) {
// Codec has taken ownership of the stream.
SkASSERT(outCodec);
@@ -941,4 +814,3 @@ SkCodec* SkPngCodec::NewFromStream(SkStream* stream, SkPngChunkReader* chunkRead
return nullptr;
}
-#endif
diff --git a/src/codec/SkPngCodec.h b/src/codec/SkPngCodec.h
index 36326ab85f..0a8878395a 100644
--- a/src/codec/SkPngCodec.h
+++ b/src/codec/SkPngCodec.h
@@ -15,7 +15,6 @@
#include "png.h"
-#if PNG_LIBPNG_VER_MAJOR > 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 5)
class SkStream;
class SkPngCodec : public SkCodec {
@@ -28,9 +27,6 @@ public:
virtual ~SkPngCodec();
protected:
- SkPngCodec(int width, int height, const SkEncodedInfo&, SkStream*, SkPngChunkReader*,
- png_structp, png_infop, int bitDepth, sk_sp<SkColorSpace>);
-
Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
override;
SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedFormat; }
@@ -38,49 +34,34 @@ protected:
uint32_t onGetFillValue(SkColorType) const override;
// Helper to set up swizzler and color table. Also calls png_read_update_info.
- bool initializeSwizzler(const SkImageInfo& requestedInfo, const Options&,
- SkPMColor*, int* ctableCount);
+ Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&,
+ SkPMColor*, int* ctableCount);
SkSampler* getSampler(bool createIfNecessary) override {
SkASSERT(fSwizzler);
return fSwizzler;
}
+ SkPngCodec(int width, int height, const SkEncodedInfo&, SkStream*, SkPngChunkReader*,
+ png_structp, png_infop, int, int, sk_sp<SkColorSpace>);
+
png_structp png_ptr() { return fPng_ptr; }
- png_infop info_ptr() { return fInfo_ptr; }
SkSwizzler* swizzler() { return fSwizzler; }
-
- /**
- * Pass available input to libpng to process it.
- *
- * libpng will call any relevant callbacks installed. This will continue decoding
- * until it reaches the end of the file, or until a callback tells libpng to stop.
- */
- void processData();
-
- Result onStartIncrementalDecode(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes,
- const SkCodec::Options&,
- SkPMColor* ctable, int* ctableCount) override;
- Result onIncrementalDecode(int*) override;
+ int numberPasses() const { return fNumberPasses; }
private:
SkAutoTUnref<SkPngChunkReader> fPngChunkReader;
png_structp fPng_ptr;
png_infop fInfo_ptr;
+ // These are stored here so they can be used both by normal decoding and scanline decoding.
SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul.
SkAutoTDelete<SkSwizzler> fSwizzler;
- const int fBitDepth;
+ const int fNumberPasses;
+ int fBitDepth;
bool createColorTable(SkColorType dstColorType, bool premultiply, int* ctableCount);
void destroyReadStruct();
- virtual Result decodeAllRows(void* dst, size_t rowBytes, int* rowsDecoded) = 0;
- virtual void setRange(int firstRow, int lastRow, void* dst, size_t rowBytes) = 0;
- virtual Result decode(int* rowsDecoded) = 0;
-
typedef SkCodec INHERITED;
};
-#else
-#undef SK_HAS_PNG_LIBRARY
-#endif
diff --git a/src/codec/SkSampledCodec.cpp b/src/codec/SkSampledCodec.cpp
index 8c39f277ae..49c939c1f8 100644
--- a/src/codec/SkSampledCodec.cpp
+++ b/src/codec/SkSampledCodec.cpp
@@ -101,65 +101,37 @@ SkCodec::Result SkSampledCodec::onGetAndroidPixels(const SkImageInfo& info, void
int scaledSubsetWidth = info.width();
int scaledSubsetHeight = info.height();
- const SkImageInfo scaledInfo = info.makeWH(scaledSize.width(), scaledSize.height());
-
- {
- // Although startScanlineDecode expects the bottom and top to match the
- // SkImageInfo, startIncrementalDecode uses them to determine when to start
- // and end calling the callback.
- SkIRect incrementalSubset = SkIRect::MakeXYWH(scaledSubsetX, scaledSubsetY,
- scaledSubsetWidth, scaledSubsetHeight);
- codecOptions.fSubset = &incrementalSubset;
- const SkCodec::Result startResult = this->codec()->startIncrementalDecode(
- scaledInfo, pixels, rowBytes, &codecOptions,
- options.fColorPtr, options.fColorCount);
- if (SkCodec::kSuccess == startResult) {
- int rowsDecoded;
- const SkCodec::Result incResult = this->codec()->incrementalDecode(&rowsDecoded);
- if (incResult == SkCodec::kSuccess) {
- return SkCodec::kSuccess;
- }
- SkASSERT(SkCodec::kIncompleteInput == incResult);
-
- // FIXME: Can zero initialized be read from SkCodec::fOptions?
- this->codec()->fillIncompleteImage(scaledInfo, pixels, rowBytes,
- options.fZeroInitialized, scaledSubsetHeight, rowsDecoded);
- return SkCodec::kIncompleteInput;
- } else if (startResult != SkCodec::kUnimplemented) {
- return startResult;
- }
- // Otherwise fall down to use the old scanline decoder.
- // codecOptions.fSubset will be reset below, so it will not continue to
- // point to the object that is no longer on the stack.
- }
-
// Start the scanline decode.
SkIRect scanlineSubset = SkIRect::MakeXYWH(scaledSubsetX, 0, scaledSubsetWidth,
scaledSize.height());
codecOptions.fSubset = &scanlineSubset;
-
- SkCodec::Result result = this->codec()->startScanlineDecode(scaledInfo,
- &codecOptions, options.fColorPtr, options.fColorCount);
+ SkCodec::Result result = this->codec()->startScanlineDecode(info.makeWH(scaledSize.width(),
+ scaledSize.height()), &codecOptions, options.fColorPtr, options.fColorCount);
if (SkCodec::kSuccess != result) {
return result;
}
// At this point, we are only concerned with subsetting. Either no scale was
// requested, or the this->codec() is handling the scale.
- // Note that subsetting is only supported for kTopDown, so this code will not be
- // reached for other orders.
- SkASSERT(this->codec()->getScanlineOrder() == SkCodec::kTopDown_SkScanlineOrder);
- if (!this->codec()->skipScanlines(scaledSubsetY)) {
- this->codec()->fillIncompleteImage(info, pixels, rowBytes, options.fZeroInitialized,
- scaledSubsetHeight, 0);
- return SkCodec::kIncompleteInput;
- }
+ switch (this->codec()->getScanlineOrder()) {
+ case SkCodec::kTopDown_SkScanlineOrder:
+ case SkCodec::kNone_SkScanlineOrder: {
+ if (!this->codec()->skipScanlines(scaledSubsetY)) {
+ this->codec()->fillIncompleteImage(info, pixels, rowBytes, options.fZeroInitialized,
+ scaledSubsetHeight, 0);
+ return SkCodec::kIncompleteInput;
+ }
- int decodedLines = this->codec()->getScanlines(pixels, scaledSubsetHeight, rowBytes);
- if (decodedLines != scaledSubsetHeight) {
- return SkCodec::kIncompleteInput;
+ int decodedLines = this->codec()->getScanlines(pixels, scaledSubsetHeight, rowBytes);
+ if (decodedLines != scaledSubsetHeight) {
+ return SkCodec::kIncompleteInput;
+ }
+ return SkCodec::kSuccess;
+ }
+ default:
+ SkASSERT(false);
+ return SkCodec::kUnimplemented;
}
- return SkCodec::kSuccess;
}
@@ -202,70 +174,10 @@ SkCodec::Result SkSampledCodec::sampledDecode(const SkImageInfo& info, void* pix
sampledOptions.fSubset = &subset;
}
- // Since we guarantee that output dimensions are always at least one (even if the sampleSize
- // is greater than a given dimension), the input sampleSize is not always the sampleSize that
- // we use in practice.
- const int sampleX = subsetWidth / info.width();
- const int sampleY = subsetHeight / info.height();
-
- const int samplingOffsetY = get_start_coord(sampleY);
- const int startY = samplingOffsetY + subsetY;
- int dstHeight = info.height();
-
- const SkImageInfo nativeInfo = info.makeWH(nativeSize.width(), nativeSize.height());
-
- {
- // Although startScanlineDecode expects the bottom and top to match the
- // SkImageInfo, startIncrementalDecode uses them to determine when to start
- // and end calling the callback.
- SkIRect incrementalSubset;
- incrementalSubset.fTop = startY;
- incrementalSubset.fBottom = startY + (dstHeight - 1) * sampleY + 1;
- if (sampledOptions.fSubset) {
- incrementalSubset.fLeft = sampledOptions.fSubset->fLeft;
- incrementalSubset.fRight = sampledOptions.fSubset->fRight;
- } else {
- incrementalSubset.fLeft = 0;
- incrementalSubset.fRight = nativeSize.width();
- }
- SkCodec::Options incrementalOptions = sampledOptions;
- incrementalOptions.fSubset = &incrementalSubset;
- const SkCodec::Result startResult = this->codec()->startIncrementalDecode(nativeInfo,
- pixels, rowBytes, &incrementalOptions, options.fColorPtr, options.fColorCount);
- if (SkCodec::kSuccess == startResult) {
- SkSampler* sampler = this->codec()->getSampler(true);
- if (!sampler) {
- return SkCodec::kUnimplemented;
- }
-
- if (sampler->setSampleX(sampleX) != info.width()) {
- return SkCodec::kInvalidScale;
- }
- if (get_scaled_dimension(subsetHeight, sampleY) != info.height()) {
- return SkCodec::kInvalidScale;
- }
-
- sampler->setSampleY(sampleY);
-
- int rowsDecoded;
- const SkCodec::Result incResult = this->codec()->incrementalDecode(&rowsDecoded);
- if (incResult == SkCodec::kSuccess) {
- return SkCodec::kSuccess;
- }
- SkASSERT(incResult == SkCodec::kIncompleteInput);
- const int lastRowInOutput = (rowsDecoded - startY) / sampleY;
- // FIXME: Should this be info or nativeInfo? Does it make a difference?
- this->codec()->fillIncompleteImage(info, pixels, rowBytes, options.fZeroInitialized,
- info.height(), lastRowInOutput);
- return SkCodec::kIncompleteInput;
- } else if (startResult != SkCodec::kUnimplemented) {
- return startResult;
- } // kUnimplemented means use the old method.
- }
-
// Start the scanline decode.
- SkCodec::Result result = this->codec()->startScanlineDecode(nativeInfo,
- &sampledOptions, options.fColorPtr, options.fColorCount);
+ SkCodec::Result result = this->codec()->startScanlineDecode(
+ info.makeWH(nativeSize.width(), nativeSize.height()), &sampledOptions,
+ options.fColorPtr, options.fColorCount);
if (SkCodec::kSuccess != result) {
return result;
}
@@ -275,6 +187,11 @@ SkCodec::Result SkSampledCodec::sampledDecode(const SkImageInfo& info, void* pix
return SkCodec::kUnimplemented;
}
+ // Since we guarantee that output dimensions are always at least one (even if the sampleSize
+ // is greater than a given dimension), the input sampleSize is not always the sampleSize that
+ // we use in practice.
+ const int sampleX = subsetWidth / info.width();
+ const int sampleY = subsetHeight / info.height();
if (sampler->setSampleX(sampleX) != info.width()) {
return SkCodec::kInvalidScale;
}
@@ -282,6 +199,9 @@ SkCodec::Result SkSampledCodec::sampledDecode(const SkImageInfo& info, void* pix
return SkCodec::kInvalidScale;
}
+ const int samplingOffsetY = get_start_coord(sampleY);
+ const int startY = samplingOffsetY + subsetY;
+ int dstHeight = info.height();
switch(this->codec()->getScanlineOrder()) {
case SkCodec::kTopDown_SkScanlineOrder: {
if (!this->codec()->skipScanlines(startY)) {
@@ -346,6 +266,30 @@ SkCodec::Result SkSampledCodec::sampledDecode(const SkImageInfo& info, void* pix
}
return SkCodec::kIncompleteInput;
}
+ case SkCodec::kNone_SkScanlineOrder: {
+ const int linesNeeded = subsetHeight - samplingOffsetY;
+ SkAutoTMalloc<uint8_t> storage(linesNeeded * rowBytes);
+ uint8_t* storagePtr = storage.get();
+
+ if (!this->codec()->skipScanlines(startY)) {
+ this->codec()->fillIncompleteImage(info, pixels, rowBytes, options.fZeroInitialized,
+ dstHeight, 0);
+ return SkCodec::kIncompleteInput;
+ }
+ int scanlines = this->codec()->getScanlines(storagePtr, linesNeeded, rowBytes);
+
+ for (int y = 0; y < dstHeight; y++) {
+ memcpy(pixels, storagePtr, info.minRowBytes());
+ storagePtr += sampleY * rowBytes;
+ pixels = SkTAddOffset<void>(pixels, rowBytes);
+ }
+
+ if (scanlines < dstHeight) {
+ // this->codec() has already handled filling uninitialized memory.
+ return SkCodec::kIncompleteInput;
+ }
+ return SkCodec::kSuccess;
+ }
default:
SkASSERT(false);
return SkCodec::kUnimplemented;
diff --git a/src/codec/SkSampler.h b/src/codec/SkSampler.h
index af6f48598c..73e11c986e 100644
--- a/src/codec/SkSampler.h
+++ b/src/codec/SkSampler.h
@@ -21,30 +21,6 @@ public:
}
/**
- * Update the sampler to sample every sampleY'th row.
- */
- void setSampleY(int sampleY) {
- fSampleY = sampleY;
- }
-
- /**
- * Retrieve the value set for sampleY.
- */
- int sampleY() const {
- return fSampleY;
- }
-
- /**
- * Based on fSampleY, return whether this row belongs in the output.
- *
- * @param row Row of the image, starting with the first row used in the
- * output.
- */
- bool rowNeeded(int row) const {
- return row % fSampleY == 0;
- }
-
- /**
* Fill the remainder of the destination with a single color
*
* @param info
@@ -78,13 +54,8 @@ public:
virtual void fill(const SkImageInfo& info, void* dst, size_t rowBytes,
uint32_t colorOrIndex, SkCodec::ZeroInitialized zeroInit) {}
- SkSampler()
- : fSampleY(1)
- {}
-
virtual ~SkSampler() {}
private:
- int fSampleY;
virtual int onSetSampleX(int) = 0;
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-29 13:22:39 +0000