AuroraMiddleware/skia2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Implement onSkipScanlines() for bmp and wbmp

Browse Source 
TBR=reed@google.com
BUG=skia:4270
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1691083002

Review URL: https://codereview.chromium.org/1691083002
This commit is contained in:
msarett 2016-02-11 13:29:36 -08:00 committed by Commit bot
parent f8289d9bd1
commit 9b9497ef14
11 changed files with 44 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/codec/SkCodec.h
View File

@ -657,18 +657,7 @@ private:
return kUnimplemented;
}
// Naive default version just calls onGetScanlines on temp memory.
virtual bool onSkipScanlines(int countLines) {
// FIXME (msarett): Make this a pure virtual and always override this.
SkAutoMalloc storage(fDstInfo.minRowBytes());
// Note that we pass 0 to rowBytes so we continue to use the same memory.
// Also note that while getScanlines checks that rowBytes is big enough,
// onGetScanlines bypasses that check.
// Calling the virtual method also means we do not double count
// countLines.
return countLines == this->onGetScanlines(storage.get(), countLines, 0);
}
virtual bool onSkipScanlines(int /*countLines*/) { return false; }
virtual int onGetScanlines(void* /*dst*/, int /*countLines*/, size_t /*rowBytes*/) { return 0; }

10
src/codec/SkBmpCodec.cpp
View File

@ -546,6 +546,7 @@ SkBmpCodec::SkBmpCodec(const SkImageInfo& info, SkStream* stream,
: INHERITED(info, stream)
, fBitsPerPixel(bitsPerPixel)
, fRowOrder(rowOrder)
, fSrcRowBytes(SkAlign4(compute_row_bytes(info.width(), fBitsPerPixel)))
{}
bool SkBmpCodec::onRewind() {
@ -577,3 +578,12 @@ int SkBmpCodec::onGetScanlines(void* dst, int count, size_t rowBytes) {
// Decode the requested rows
return this->decodeRows(rowInfo, dst, rowBytes, this->options());
}
bool SkBmpCodec::skipRows(int count) {
const size_t bytesToSkip = count * fSrcRowBytes;
return this->stream()->skip(bytesToSkip) == bytesToSkip;
}
bool SkBmpCodec::onSkipScanlines(int count) {
return this->skipRows(count);
}

6
src/codec/SkBmpCodec.h
View File

@ -81,6 +81,7 @@ protected:
*/
uint16_t bitsPerPixel() const { return fBitsPerPixel; }
SkScanlineOrder onGetScanlineOrder() const override { return fRowOrder; }
size_t srcRowBytes() const { return fSrcRowBytes; }
/*
* To be overriden by bmp subclasses, which provide unique implementations.
@ -127,15 +128,18 @@ private:
virtual int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
const Options& opts) = 0;
virtual bool skipRows(int count);
Result onStartScanlineDecode(const SkImageInfo& dstInfo, const SkCodec::Options&,
SkPMColor inputColorPtr[], int* inputColorCount) override;
int onGetScanlines(void* dst, int count, size_t rowBytes) override;
// TODO(msarett): Override default skipping with something more clever.
bool onSkipScanlines(int count) override;
const uint16_t fBitsPerPixel;
const SkScanlineOrder fRowOrder;
const size_t fSrcRowBytes;
typedef SkCodec INHERITED;
};

5
src/codec/SkBmpMaskCodec.cpp
View File

@ -18,8 +18,7 @@ SkBmpMaskCodec::SkBmpMaskCodec(const SkImageInfo& info, SkStream* stream,
: INHERITED(info, stream, bitsPerPixel, rowOrder)
, fMasks(masks)
, fMaskSwizzler(nullptr)
, fSrcRowBytes(SkAlign4(compute_row_bytes(this->getInfo().width(), this->bitsPerPixel())))
, fSrcBuffer(new uint8_t [fSrcRowBytes])
, fSrcBuffer(new uint8_t [this->srcRowBytes()])
{}
/*
@ -92,7 +91,7 @@ int SkBmpMaskCodec::decodeRows(const SkImageInfo& dstInfo,
const int height = dstInfo.height();
for (int y = 0; y < height; y++) {
// Read a row of the input
if (this->stream()->read(srcRow, fSrcRowBytes) != fSrcRowBytes) {
if (this->stream()->read(srcRow, this->srcRowBytes()) != this->srcRowBytes()) {
SkCodecPrintf("Warning: incomplete input stream.\n");
return y;
}

1
src/codec/SkBmpMaskCodec.h
View File

@ -55,7 +55,6 @@ private:
SkAutoTDelete<SkMasks> fMasks; // owned
SkAutoTDelete<SkMaskSwizzler> fMaskSwizzler;
const size_t fSrcRowBytes;
SkAutoTDeleteArray<uint8_t> fSrcBuffer;
typedef SkBmpCodec INHERITED;

13
src/codec/SkBmpRLECodec.cpp
View File

@ -201,7 +201,7 @@ size_t SkBmpRLECodec::checkForMoreData() {
void SkBmpRLECodec::setPixel(void* dst, size_t dstRowBytes,
const SkImageInfo& dstInfo, uint32_t x, uint32_t y,
uint8_t index) {
if (is_coord_necessary(x, fSampleX, dstInfo.width())) {
if (dst && is_coord_necessary(x, fSampleX, dstInfo.width())) {
// Set the row
uint32_t row = this->getDstRow(y, dstInfo.height());
@ -234,7 +234,7 @@ void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
const SkImageInfo& dstInfo, uint32_t x,
uint32_t y, uint8_t red, uint8_t green,
uint8_t blue) {
if (is_coord_necessary(x, fSampleX, dstInfo.width())) {
if (dst && is_coord_necessary(x, fSampleX, dstInfo.width())) {
// Set the row
uint32_t row = this->getDstRow(y, dstInfo.height());
@ -316,7 +316,9 @@ int SkBmpRLECodec::decodeRows(const SkImageInfo& info, void* dst, size_t dstRowB
// Because of the need for transparent pixels, kN32 is the only color
// type that makes sense for the destination format.
SkASSERT(kN32_SkColorType == dstInfo.colorType());
if (dst) {
SkSampler::Fill(dstInfo, dst, dstRowBytes, SK_ColorTRANSPARENT, opts.fZeroInitialized);
}
// Adjust the height and the dst if the previous call to decodeRows() left us
// with lines that need to be skipped.
@ -500,6 +502,13 @@ int SkBmpRLECodec::decodeRows(const SkImageInfo& info, void* dst, size_t dstRowB
}
}
bool SkBmpRLECodec::skipRows(int count) {
const SkImageInfo rowInfo = SkImageInfo::Make(this->getInfo().width(), count, kN32_SkColorType,
kUnpremul_SkAlphaType);
return count == this->decodeRows(rowInfo, nullptr, 0, this->options());
}
// FIXME: Make SkBmpRLECodec have no knowledge of sampling.
// Or it should do all sampling natively.
// It currently is a hybrid that needs to know what SkScaledCodec is doing.

5
src/codec/SkBmpRLECodec.h
View File

@ -84,9 +84,14 @@ private:
const SkImageInfo& dstInfo, uint32_t x, uint32_t y,
uint8_t red, uint8_t green, uint8_t blue);
/*
* If dst is NULL, this is a signal to skip the rows.
*/
int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
const Options& opts) override;
bool skipRows(int count) override;
SkSampler* getSampler(bool createIfNecessary) override;
SkAutoTUnref<SkColorTable> fColorTable; // owned

7
src/codec/SkBmpStandardCodec.cpp
View File

@ -25,8 +25,7 @@ SkBmpStandardCodec::SkBmpStandardCodec(const SkImageInfo& info, SkStream* stream
, fBytesPerColor(bytesPerColor)
, fOffset(offset)
, fSwizzler(nullptr)
, fSrcRowBytes(SkAlign4(compute_row_bytes(this->getInfo().width(), this->bitsPerPixel())))
, fSrcBuffer(new uint8_t [fSrcRowBytes])
, fSrcBuffer(new uint8_t [this->srcRowBytes()])
, fIsOpaque(isOpaque)
, fInIco(inIco)
, fAndMaskRowBytes(fInIco ? SkAlign4(compute_row_bytes(this->getInfo().width(), 1)) : 0)
@ -225,7 +224,7 @@ int SkBmpStandardCodec::decodeRows(const SkImageInfo& dstInfo, void* dst, size_t
const int height = dstInfo.height();
for (int y = 0; y < height; y++) {
// Read a row of the input
if (this->stream()->read(fSrcBuffer.get(), fSrcRowBytes) != fSrcRowBytes) {
if (this->stream()->read(fSrcBuffer.get(), this->srcRowBytes()) != this->srcRowBytes()) {
SkCodecPrintf("Warning: incomplete input stream.\n");
return y;
}
@ -262,7 +261,7 @@ int SkBmpStandardCodec::decodeRows(const SkImageInfo& dstInfo, void* dst, size_t
// Calculate how many bytes we must skip to reach the AND mask.
const int remainingScanlines = this->getInfo().height() - startScanline - height;
const size_t bytesToSkip = remainingScanlines * fSrcRowBytes +
const size_t bytesToSkip = remainingScanlines * this->srcRowBytes() +
startScanline * fAndMaskRowBytes;
const size_t subStreamStartPosition = currPosition + bytesToSkip;
if (subStreamStartPosition >= length) {

1
src/codec/SkBmpStandardCodec.h
View File

@ -90,7 +90,6 @@ private:
const uint32_t fBytesPerColor;
const uint32_t fOffset;
SkAutoTDelete<SkSwizzler> fSwizzler;
const size_t fSrcRowBytes;
SkAutoTDeleteArray<uint8_t> fSrcBuffer;
const bool fIsOpaque;
const bool fInIco;

5
src/codec/SkWbmpCodec.cpp
View File

@ -181,6 +181,11 @@ int SkWbmpCodec::onGetScanlines(void* dst, int count, size_t dstRowBytes) {
return count;
}
bool SkWbmpCodec::onSkipScanlines(int count) {
const size_t bytesToSkip = count * fSrcRowBytes;
return this->stream()->skip(bytesToSkip) == bytesToSkip;
}
SkCodec::Result SkWbmpCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
const Options& options, SkPMColor inputColorTable[], int* inputColorCount) {
if (options.fSubset) {

2
src/codec/SkWbmpCodec.h
View File

@ -52,8 +52,8 @@ private:
SkAutoTUnref<SkColorTable> fColorTable;
SkAutoTMalloc<uint8_t> fSrcBuffer;
// FIXME: Override onSkipScanlines to avoid swizzling.
int onGetScanlines(void* dst, int count, size_t dstRowBytes) override;
bool onSkipScanlines(int count) override;
Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options,
SkPMColor inputColorTable[], int* inputColorCount) override;