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Enabling ico decoding with use of png and bmp decoders

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BUG=skia:3257

Review URL: https://codereview.chromium.org/1011343003
This commit is contained in:
msarett 2015-03-24 12:24:27 -07:00 committed by Commit bot
parent 46bffd6fbe
commit 15bfd075d3
11 changed files with 534 additions and 73 deletions
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4
dm/DM.cpp
View File

@ -146,7 +146,9 @@ static void push_src(const char* tag, Src* s) {
static bool codec_supported(const char* ext) {
// FIXME: Once other versions of SkCodec are available, we can add them to this
// list (and eventually we can remove this check once they are all supported).
return strcmp(ext, "png") == 0 || strcmp(ext, "PNG") == 0;
return strcmp(ext, "png") == 0 || strcmp(ext, "PNG") == 0 ||
strcmp(ext, "bmp") == 0 || strcmp(ext, "BMP") == 0 ||
strcmp(ext, "ico") == 0 || strcmp(ext, "ICO") == 0;
}
static void gather_srcs() {

6
dm/DMSrcSink.cpp
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@ -88,7 +88,11 @@ Error CodecSrc::draw(SkCanvas* canvas) const {
SkISize CodecSrc::size() const {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(encoded));
return codec->getInfo().dimensions();
if (NULL != codec) {
return codec->getInfo().dimensions();
} else {
return SkISize::Make(0, 0);
}
}
Name CodecSrc::name() const {

4
gyp/codec.gyp
View File

@ -13,11 +13,13 @@
'include_dirs': [
'../include/codec',
'../src/codec',
'../src/core',
],
'sources': [
'../src/codec/SkCodec.cpp',
'../src/codec/SkCodec_libpng.cpp',
'../src/codec/SkCodec_libbmp.cpp',
'../src/codec/SkCodec_libico.cpp',
'../src/codec/SkCodec_libpng.cpp',
'../src/codec/SkMaskSwizzler.cpp',
'../src/codec/SkMasks.cpp',
'../src/codec/SkSwizzler.cpp',

3
include/codec/SkCodec.h
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@ -71,9 +71,6 @@ protected:
}
#endif
// Helper for subclasses.
const SkImageInfo& getOriginalInfo() { return fInfo; }
virtual SkISize onGetScaledDimensions(float /* desiredScale */) const {
// By default, scaling is not supported.
return fInfo.dimensions();

2
src/codec/SkCodec.cpp
View File

@ -8,6 +8,7 @@
#include "SkCodec.h"
#include "SkData.h"
#include "SkCodec_libbmp.h"
#include "SkCodec_libico.h"
#include "SkCodec_libpng.h"
#include "SkStream.h"
@ -18,6 +19,7 @@ struct DecoderProc {
static const DecoderProc gDecoderProcs[] = {
{ SkPngCodec::IsPng, SkPngCodec::NewFromStream },
{ SkIcoCodec::IsIco, SkIcoCodec::NewFromStream },
{ SkBmpCodec::IsBmp, SkBmpCodec::NewFromStream }
};

216
src/codec/SkCodec_libbmp.cpp
View File

@ -29,9 +29,6 @@ static bool conversion_possible(const SkImageInfo& dst,
return src.alphaType() == dst.alphaType() ||
(kPremul_SkAlphaType == dst.alphaType() &&
kUnpremul_SkAlphaType == src.alphaType());
case kRGB_565_SkColorType:
return src.alphaType() == dst.alphaType() &&
kOpaque_SkAlphaType == dst.alphaType();
default:
return false;
}
@ -88,11 +85,31 @@ bool SkBmpCodec::IsBmp(SkStream* stream) {
/*
*
* Assumes IsBmp was called and returned true
* Creates a bitmap decoder
* Creates a bmp decoder
* Reads enough of the stream to determine the image format
*
*/
SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
return SkBmpCodec::NewFromStream(stream, false);
}
/*
*
* Creates a bmp decoder for a bmp embedded in ico
* Reads enough of the stream to determine the image format
*
*/
SkCodec* SkBmpCodec::NewFromIco(SkStream* stream) {
return SkBmpCodec::NewFromStream(stream, true);
}
/*
*
* Creates a bmp decoder
* Reads enough of the stream to determine the image format
*
*/
SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
// Header size constants
static const uint32_t kBmpHeaderBytes = 14;
static const uint32_t kBmpHeaderBytesPlusFour = kBmpHeaderBytes + 4;
@ -106,37 +123,68 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
static const uint32_t kBmpInfoV5Bytes = 124;
static const uint32_t kBmpMaskBytes = 12;
// Read the first header and the size of the second header
SkAutoTDeleteArray<uint8_t> hBuffer(
SkNEW_ARRAY(uint8_t, kBmpHeaderBytesPlusFour));
if (stream->read(hBuffer.get(), kBmpHeaderBytesPlusFour) !=
kBmpHeaderBytesPlusFour) {
SkDebugf("Error: unable to read first bitmap header.\n");
return NULL;
}
// The total bytes in the bmp file
// We only need to use this value for RLE decoding, so we will only check
// that it is valid in the RLE case.
const uint32_t totalBytes = get_int(hBuffer.get(), 2);
// We only need to use this value for RLE decoding, so we will only
// check that it is valid in the RLE case.
uint32_t totalBytes;
// The offset from the start of the file where the pixel data begins
const uint32_t offset = get_int(hBuffer.get(), 10);
if (offset < kBmpHeaderBytes + kBmpOS2V1Bytes) {
SkDebugf("Error: invalid starting location for pixel data\n");
return NULL;
uint32_t offset;
// The size of the second (info) header in bytes
uint32_t infoBytes;
// Bmps embedded in Icos skip the first Bmp header
if (!isIco) {
// Read the first header and the size of the second header
SkAutoTDeleteArray<uint8_t> hBuffer(
SkNEW_ARRAY(uint8_t, kBmpHeaderBytesPlusFour));
if (stream->read(hBuffer.get(), kBmpHeaderBytesPlusFour) !=
kBmpHeaderBytesPlusFour) {
SkDebugf("Error: unable to read first bitmap header.\n");
return NULL;
}
totalBytes = get_int(hBuffer.get(), 2);
offset = get_int(hBuffer.get(), 10);
if (offset < kBmpHeaderBytes + kBmpOS2V1Bytes) {
SkDebugf("Error: invalid starting location for pixel data\n");
return NULL;
}
// The size of the second (info) header in bytes
// The size is the first field of the second header, so we have already
// read the first four infoBytes.
infoBytes = get_int(hBuffer.get(), 14);
if (infoBytes < kBmpOS2V1Bytes) {
SkDebugf("Error: invalid second header size.\n");
return NULL;
}
} else {
// This value is only used by RLE compression. Bmp in Ico files do not
// use RLE. If the compression field is incorrectly signaled as RLE,
// we will catch this and signal an error below.
totalBytes = 0;
// Bmps in Ico cannot specify an offset. We will always assume that
// pixel data begins immediately after the color table. This value
// will be corrected below.
offset = 0;
// Read the size of the second header
SkAutoTDeleteArray<uint8_t> hBuffer(
SkNEW_ARRAY(uint8_t, 4));
if (stream->read(hBuffer.get(), 4) != 4) {
SkDebugf("Error: unable to read size of second bitmap header.\n");
return NULL;
}
infoBytes = get_int(hBuffer.get(), 0);
if (infoBytes < kBmpOS2V1Bytes) {
SkDebugf("Error: invalid second header size.\n");
return NULL;
}
}
// The size of the second (info) header in bytes
// The size is the first field of the second header, so we have already
// read the first four infoBytes.
const uint32_t infoBytes = get_int(hBuffer.get(), 14);
if (infoBytes < kBmpOS2V1Bytes) {
SkDebugf("Error: invalid second header size.\n");
return NULL;
}
// We already read the first four bytes of the info header to get the size
const uint32_t infoBytesRemaining = infoBytes - 4;
hBuffer.free();
// Read the second header
SkAutoTDeleteArray<uint8_t> iBuffer(
@ -243,6 +291,11 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
height = -height;
rowOrder = kTopDown_RowOrder;
}
// The height field for bmp in ico is double the actual height because they
// contain an XOR mask followed by an AND mask
if (isIco) {
height /= 2;
}
static const int kBmpMaxDim = 1 << 16;
if (width < 0 || width >= kBmpMaxDim || height >= kBmpMaxDim) {
// TODO: Decide if we want to support really large bmps.
@ -344,16 +397,19 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
// Most versions of bmps should be rendered as opaque. Either they do
// not have an alpha channel, or they expect the alpha channel to be
// ignored. V4+ bmp files introduce an alpha mask and allow the creator
// ignored. V3+ bmp files introduce an alpha mask and allow the creator
// of the image to use the alpha channels. However, many of these images
// leave the alpha channel blank and expect to be rendered as opaque. For
// this reason, we set the alpha type to kUnknown for V4+ bmps and figure
// out the alpha type during the decode.
// leave the alpha channel blank and expect to be rendered as opaque. This
// is the case for almost all V3 images, so we render these as opaque. For
// V4+, we will use the alpha channel, and fix the image later if it turns
// out to be fully transparent.
// As an exception, V3 bmp-in-ico may use an alpha mask.
SkAlphaType alphaType = kOpaque_SkAlphaType;
if (kInfoV4_BitmapHeaderType == headerType ||
if ((kInfoV3_BitmapHeaderType == headerType && isIco) ||
kInfoV4_BitmapHeaderType == headerType ||
kInfoV5_BitmapHeaderType == headerType) {
// Header types are matched based on size. If the header is
// V4+, we are guaranteed to be able to read at least this size.
// V3+, we are guaranteed to be able to read at least this size.
SkASSERT(infoBytesRemaining > 52);
inputMasks.alpha = get_int(iBuffer.get(), 48);
if (inputMasks.alpha != 0) {
@ -362,6 +418,11 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
}
iBuffer.free();
// Additionally, 32 bit bmp-in-icos use the alpha channel
if (isIco && 32 == bitsPerPixel) {
alphaType = kUnpremul_SkAlphaType;
}
// Check for valid bits per pixel input
switch (bitsPerPixel) {
// In addition to more standard pixel compression formats, bmp supports
@ -406,7 +467,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
// Calculate the number of bytes read so far
const uint32_t bytesRead = kBmpHeaderBytes + infoBytes + maskBytes;
if (offset < bytesRead) {
if (!isIco && offset < bytesRead) {
SkDebugf("Error: pixel data offset less than header size.\n");
return NULL;
}
@ -420,7 +481,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream) {
return SkNEW_ARGS(SkBmpCodec, (imageInfo, stream, bitsPerPixel,
inputFormat, masks.detach(), numColors,
bytesPerColor, offset - bytesRead,
rowOrder, RLEBytes));
rowOrder, RLEBytes, isIco));
}
/*
@ -433,7 +494,7 @@ SkBmpCodec::SkBmpCodec(const SkImageInfo& info, SkStream* stream,
uint16_t bitsPerPixel, BitmapInputFormat inputFormat,
SkMasks* masks, uint32_t numColors,
uint32_t bytesPerColor, uint32_t offset,
RowOrder rowOrder, size_t RLEBytes)
RowOrder rowOrder, size_t RLEBytes, bool isIco)
: INHERITED(info, stream)
, fBitsPerPixel(bitsPerPixel)
, fInputFormat(inputFormat)
@ -444,6 +505,8 @@ SkBmpCodec::SkBmpCodec(const SkImageInfo& info, SkStream* stream,
, fOffset(offset)
, fRowOrder(rowOrder)
, fRLEBytes(RLEBytes)
, fIsIco(isIco)
{}
/*
@ -459,11 +522,11 @@ SkCodec::Result SkBmpCodec::onGetPixels(const SkImageInfo& dstInfo,
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
}
if (dstInfo.dimensions() != this->getOriginalInfo().dimensions()) {
if (dstInfo.dimensions() != this->getInfo().dimensions()) {
SkDebugf("Error: scaling not supported.\n");
return kInvalidScale;
}
if (!conversion_possible(dstInfo, this->getOriginalInfo())) {
if (!conversion_possible(dstInfo, this->getInfo())) {
SkDebugf("Error: cannot convert input type to output type.\n");
return kInvalidConversion;
}
@ -553,26 +616,29 @@ SkCodec::Result SkBmpCodec::onGetPixels(const SkImageInfo& dstInfo,
}
}
// Check that we have not read past the pixel array offset
if(fOffset < colorBytes) {
// This may occur on OS 2.1 and other old versions where the color
// table defaults to max size, and the bmp tries to use a smaller color
// table. This is invalid, and our decision is to indicate an error,
// rather than try to guess the intended size of the color table.
SkDebugf("Error: pixel data offset less than color table size.\n");
return false;
}
// Bmp-in-Ico files do not use an offset to indicate where the pixel data
// begins. Pixel data always begins immediately after the color table.
if (!fIsIco) {
// Check that we have not read past the pixel array offset
if(fOffset < colorBytes) {
// This may occur on OS 2.1 and other old versions where the color
// table defaults to max size, and the bmp tries to use a smaller
// color table. This is invalid, and our decision is to indicate
// an error, rather than try to guess the intended size of the
// color table.
SkDebugf("Error: pixel data offset less than color table size.\n");
return false;
}
// After reading the color table, skip to the start of the pixel array
if (stream()->skip(fOffset - colorBytes) != fOffset - colorBytes) {
SkDebugf("Error: unable to skip to image data.\n");
return false;
// After reading the color table, skip to the start of the pixel array
if (stream()->skip(fOffset - colorBytes) != fOffset - colorBytes) {
SkDebugf("Error: unable to skip to image data.\n");
return false;
}
}
// Set the color table and return true on success
if (maxColors > 0) {
fColorTable.reset(SkNEW_ARGS(SkColorTable, (colorTable, maxColors)));
}
fColorTable.reset(SkNEW_ARGS(SkColorTable, (colorTable, maxColors)));
return true;
}
@ -989,7 +1055,6 @@ SkCodec::Result SkBmpCodec::decode(const SkImageInfo& dstInfo,
// SkSwizzler does not support. Firstly, all bmp images that contain
// alpha are masked by the alpha mask. Secondly, many fully transparent
// bmp images are intended to be opaque. Here, we make those corrections.
// Modifying alpha is safe because colors are stored unpremultiplied.
/*
SkPMColor* dstRow = (SkPMColor*) dst;
if (SkSwizzler::kBGRA == config) {
@ -1006,6 +1071,41 @@ SkCodec::Result SkBmpCodec::decode(const SkImageInfo& dstInfo,
}
*/
// Finally, apply the AND mask for bmp-in-ico images
if (fIsIco) {
// The AND mask is always 1 bit per pixel
const size_t rowBytes = SkAlign4(compute_row_bytes(width, 1));
SkPMColor* dstPtr = (SkPMColor*) dst;
for (int y = 0; y < height; y++) {
// The srcBuffer will at least be large enough
if (stream()->read(srcBuffer.get(), rowBytes) != rowBytes) {
SkDebugf("Warning: incomplete AND mask for bmp-in-ico.\n");
return kIncompleteInput;
}
int row;
if (kBottomUp_RowOrder == fRowOrder) {
row = height - y - 1;
} else {
row = y;
}
SkPMColor* dstRow =
SkTAddOffset<SkPMColor>(dstPtr, row * dstRowBytes);
for (int x = 0; x < width; x++) {
int quotient;
int modulus;
SkTDivMod(x, 8, &quotient, &modulus);
uint32_t shift = 7 - modulus;
uint32_t alphaBit =
(srcBuffer.get()[quotient] >> shift) & 0x1;
dstRow[x] &= alphaBit - 1;
}
}
}
// Finished decoding the entire image
return kSuccess;
}

30
src/codec/SkCodec_libbmp.h
View File

@ -7,7 +7,6 @@
#include "SkCodec.h"
#include "SkColorTable.h"
#include "SkEncodedFormat.h"
#include "SkImageInfo.h"
#include "SkMaskSwizzler.h"
#include "SkStream.h"
@ -36,7 +35,7 @@ public:
/*
*
* Checks the start of the stream to see if the image is a bitmap
* Checks the start of the stream to see if the image is a bmp
*
*/
static bool IsBmp(SkStream*);
@ -44,17 +43,25 @@ public:
/*
*
* Assumes IsBmp was called and returned true
* Creates a bitmap decoder
* Creates a bmp decoder
* Reads enough of the stream to determine the image format
*
*/
static SkCodec* NewFromStream(SkStream*);
/*
*
* Creates a bmp decoder for a bmp embedded in ico
* Reads enough of the stream to determine the image format
*
*/
static SkCodec* NewFromIco(SkStream*);
protected:
/*
*
* Initiates the bitmap decode
* Initiates the bmp decode
*
*/
virtual Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
@ -62,11 +69,12 @@ protected:
int*) SK_OVERRIDE;
SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { return kBMP_SkEncodedFormat; }
private:
/*
*
* Used to define the input format of the bitmap
* Used to define the input format of the bmp
*
*/
enum BitmapInputFormat {
@ -83,6 +91,14 @@ private:
*/
bool createColorTable(SkAlphaType alphaType);
/*
*
* Creates a bmp decoder
* Reads enough of the stream to determine the image format
*
*/
static SkCodec* NewFromStream(SkStream*, bool isIco);
/*
*
* Performs the bitmap decoding for bit masks input format
@ -149,7 +165,8 @@ private:
SkBmpCodec(const SkImageInfo& srcInfo, SkStream* stream,
uint16_t bitsPerPixel, BitmapInputFormat format,
SkMasks* masks, uint32_t numColors, uint32_t bytesPerColor,
uint32_t offset, RowOrder rowOrder, size_t RLEByes);
uint32_t offset, RowOrder rowOrder, size_t RLEBytes,
bool isIco);
// Fields
const uint16_t fBitsPerPixel;
@ -161,6 +178,7 @@ private:
const uint32_t fOffset;
const RowOrder fRowOrder;
const size_t fRLEBytes;
const bool fIsIco;
typedef SkCodec INHERITED;
};

254
src/codec/SkCodec_libico.cpp Normal file
View File

@ -0,0 +1,254 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCodec_libbmp.h"
#include "SkCodec_libico.h"
#include "SkCodec_libpng.h"
#include "SkCodecPriv.h"
#include "SkColorPriv.h"
#include "SkData.h"
#include "SkStream.h"
#include "SkTDArray.h"
#include "SkTSort.h"
/*
* Checks the start of the stream to see if the image is an Ico or Cur
*/
bool SkIcoCodec::IsIco(SkStream* stream) {
const char icoSig[] = { '\x00', '\x00', '\x01', '\x00' };
const char curSig[] = { '\x00', '\x00', '\x02', '\x00' };
char buffer[sizeof(icoSig)];
return stream->read(buffer, sizeof(icoSig)) == sizeof(icoSig) &&
(!memcmp(buffer, icoSig, sizeof(icoSig)) ||
!memcmp(buffer, curSig, sizeof(curSig)));
}
/*
* Assumes IsIco was called and returned true
* Creates an Ico decoder
* Reads enough of the stream to determine the image format
*/
SkCodec* SkIcoCodec::NewFromStream(SkStream* stream) {
// Header size constants
static const uint32_t kIcoDirectoryBytes = 6;
static const uint32_t kIcoDirEntryBytes = 16;
// Read the directory header
SkAutoTDeleteArray<uint8_t> dirBuffer(
SkNEW_ARRAY(uint8_t, kIcoDirectoryBytes));
if (stream->read(dirBuffer.get(), kIcoDirectoryBytes) !=
kIcoDirectoryBytes) {
SkDebugf("Error: unable to read ico directory header.\n");
return NULL;
}
// Process the directory header
const uint16_t numImages = get_short(dirBuffer.get(), 4);
if (0 == numImages) {
SkDebugf("Error: No images embedded in ico.\n");
return NULL;
}
// Ensure that we can read all of indicated directory entries
SkAutoTDeleteArray<uint8_t> entryBuffer(
SkNEW_ARRAY(uint8_t, numImages*kIcoDirEntryBytes));
if (stream->read(entryBuffer.get(), numImages*kIcoDirEntryBytes) !=
numImages*kIcoDirEntryBytes) {
SkDebugf("Error: unable to read ico directory entries.\n");
return NULL;
}
// This structure is used to represent the vital information about entries
// in the directory header. We will obtain this information for each
// directory entry.
struct Entry {
uint32_t offset;
uint32_t size;
};
SkAutoTDeleteArray<Entry> directoryEntries(SkNEW_ARRAY(Entry, numImages));
// Iterate over directory entries
for (uint32_t i = 0; i < numImages; i++) {
// The directory entry contains information such as width, height,
// bits per pixel, and number of colors in the color palette. We will
// ignore these fields since they are repeated in the header of the
// embedded image. In the event of an inconsistency, we would always
// defer to the value in the embedded header anyway.
// Specifies the size of the embedded image, including the header
uint32_t size = get_int(entryBuffer.get(), 8 + i*kIcoDirEntryBytes);
// Specifies the offset of the embedded image from the start of file.
// It does not indicate the start of the pixel data, but rather the
// start of the embedded image header.
uint32_t offset = get_int(entryBuffer.get(), 12 + i*kIcoDirEntryBytes);
// Save the vital fields
directoryEntries.get()[i].offset = offset;
directoryEntries.get()[i].size = size;
}
// It is "customary" that the embedded images will be stored in order of
// increasing offset. However, the specification does not indicate that
// they must be stored in this order, so we will not trust that this is the
// case. Here we sort the embedded images by increasing offset.
struct EntryLessThan {
bool operator() (Entry a, Entry b) const {
return a.offset < b.offset;
}
};
EntryLessThan lessThan;
SkTQSort(directoryEntries.get(), directoryEntries.get() + numImages - 1,
lessThan);
// Now will construct a candidate codec for each of the embedded images
uint32_t bytesRead = kIcoDirectoryBytes + numImages * kIcoDirEntryBytes;
SkAutoTDelete<SkTArray<SkAutoTDelete<SkCodec>, true>> codecs(
SkNEW_ARGS((SkTArray<SkAutoTDelete<SkCodec>, true>), (numImages)));
for (uint32_t i = 0; i < numImages; i++) {
uint32_t offset = directoryEntries.get()[i].offset;
uint32_t size = directoryEntries.get()[i].size;
// Ensure that the offset is valid
if (offset < bytesRead) {
SkDebugf("Warning: invalid ico offset.\n");
continue;
}
// If we cannot skip, assume we have reached the end of the stream and
// stop trying to make codecs
if (stream->skip(offset - bytesRead) != offset - bytesRead) {
SkDebugf("Warning: could not skip to ico offset.\n");
break;
}
bytesRead = offset;
// Create a new stream for the embedded codec
SkAutoTUnref<SkData> data(SkData::NewFromStream(stream, size));
if (NULL == data.get()) {
SkDebugf("Warning: could not create embedded stream.\n");
break;
}
SkAutoTDelete<SkMemoryStream>
embeddedStream(SkNEW_ARGS(SkMemoryStream, (data.get())));
bytesRead += size;
// Check if the embedded codec is bmp or png and create the codec
const bool isPng = SkPngCodec::IsPng(embeddedStream);
SkAssertResult(embeddedStream->rewind());
SkCodec* codec = NULL;
if (isPng) {
codec = SkPngCodec::NewFromStream(embeddedStream.detach());
} else {
codec = SkBmpCodec::NewFromIco(embeddedStream.detach());
}
// Save a valid codec
if (NULL != codec) {
codecs->push_back().reset(codec);
}
}
// Recognize if there are no valid codecs
if (0 == codecs->count()) {
SkDebugf("Error: could not find any valid embedded ico codecs.\n");
return NULL;
}
// Use the largest codec as a "suggestion" for image info
uint32_t maxSize = 0;
uint32_t maxIndex = 0;
for (int32_t i = 0; i < codecs->count(); i++) {
SkImageInfo info = codecs->operator[](i)->getInfo();
uint32_t size = info.width() * info.height();
if (size > maxSize) {
maxSize = size;
maxIndex = i;
}
}
SkImageInfo info = codecs->operator[](maxIndex)->getInfo();
// Note that stream is owned by the embedded codec, the ico does not need
// direct access to the stream.
return SkNEW_ARGS(SkIcoCodec, (info, codecs.detach()));
}
/*
* Creates an instance of the decoder
* Called only by NewFromStream
*/
SkIcoCodec::SkIcoCodec(const SkImageInfo& info,
SkTArray<SkAutoTDelete<SkCodec>, true>* codecs)
: INHERITED(info, NULL)
, fEmbeddedCodecs(codecs)
{}
/*
* Chooses the best dimensions given the desired scale
*/
SkISize SkIcoCodec::onGetScaledDimensions(float desiredScale) const {
// We set the dimensions to the largest candidate image by default.
// Regardless of the scale request, this is the largest image that we
// will decode.
if (desiredScale >= 1.0) {
return this->getInfo().dimensions();
}
int origWidth = this->getInfo().width();
int origHeight = this->getInfo().height();
float desiredSize = desiredScale * origWidth * origHeight;
// At least one image will have smaller error than this initial value
float minError = ((float) (origWidth * origHeight)) - desiredSize + 1.0f;
int32_t minIndex = -1;
for (int32_t i = 0; i < fEmbeddedCodecs->count(); i++) {
int width = fEmbeddedCodecs->operator[](i)->getInfo().width();
int height = fEmbeddedCodecs->operator[](i)->getInfo().height();
float error = SkTAbs(((float) (width * height)) - desiredSize);
if (error < minError) {
minError = error;
minIndex = i;
}
}
SkASSERT(minIndex >= 0);
return fEmbeddedCodecs->operator[](minIndex)->getInfo().dimensions();
}
/*
* Initiates the Ico decode
*/
SkCodec::Result SkIcoCodec::onGetPixels(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts, SkPMColor* ct,
int* ptr) {
// We return invalid scale if there is no candidate image with matching
// dimensions.
Result result = kInvalidScale;
for (int32_t i = 0; i < fEmbeddedCodecs->count(); i++) {
// If the dimensions match, try to decode
if (dstInfo.dimensions() ==
fEmbeddedCodecs->operator[](i)->getInfo().dimensions()) {
// Perform the decode
result = fEmbeddedCodecs->operator[](i)->getPixels(dstInfo,
dst, dstRowBytes, &opts, ct, ptr);
// On a fatal error, keep trying to find an image to decode
if (kInvalidConversion == result || kInvalidInput == result ||
kInvalidScale == result) {
SkDebugf("Warning: Attempt to decode candidate ico failed.\n");
continue;
}
// On success or partial success, return the result
return result;
}
}
SkDebugf("Error: No matching candidate image in ico.\n");
return result;
}

62
src/codec/SkCodec_libico.h Normal file
View File

@ -0,0 +1,62 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCodec.h"
#include "SkImageInfo.h"
#include "SkStream.h"
#include "SkTypes.h"
/*
* This class implements the decoding for bmp images
*/
class SkIcoCodec : public SkCodec {
public:
/*
* Checks the start of the stream to see if the image is a Ico or Cur
*/
static bool IsIco(SkStream*);
/*
* Assumes IsIco was called and returned true
* Creates an Ico decoder
* Reads enough of the stream to determine the image format
*/
static SkCodec* NewFromStream(SkStream*);
protected:
/*
* Chooses the best dimensions given the desired scale
*/
SkISize onGetScaledDimensions(float desiredScale) const SK_OVERRIDE;
/*
* Initiates the Ico decode
*/
Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
size_t dstRowBytes, const Options&, SkPMColor*, int*)
SK_OVERRIDE;
SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE {
return kICO_SkEncodedFormat;
}
private:
/*
* Constructor called by NewFromStream
* @param embeddedCodecs codecs for the embedded images, takes ownership
*/
SkIcoCodec(const SkImageInfo& srcInfo,
SkTArray<SkAutoTDelete<SkCodec>, true>* embeddedCodecs);
SkAutoTDelete<SkTArray<SkAutoTDelete<SkCodec>, true>>
fEmbeddedCodecs; // owned
typedef SkCodec INHERITED;
};

6
src/codec/SkCodec_libpng.cpp
View File

@ -368,10 +368,10 @@ SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
}
if (requestedInfo.dimensions() != this->getOriginalInfo().dimensions()) {
if (requestedInfo.dimensions() != this->getInfo().dimensions()) {
return kInvalidScale;
}
if (!conversion_possible(requestedInfo, this->getOriginalInfo())) {
if (!conversion_possible(requestedInfo, this->getInfo())) {
return kInvalidConversion;
}
@ -424,7 +424,7 @@ SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
// told png to upscale.
SkASSERT(PNG_COLOR_TYPE_GRAY == pngColorType);
sc = SkSwizzler::kGray;
} else if (this->getOriginalInfo().alphaType() == kOpaque_SkAlphaType) {
} else if (this->getInfo().alphaType() == kOpaque_SkAlphaType) {
sc = SkSwizzler::kRGBX;
} else {
sc = SkSwizzler::kRGBA;

20
tools/dm_flags.py
View File

@ -51,6 +51,26 @@ def get_args(bot):
blacklist.extend('gpu _ PANO_20121023_214540.jpg'.split(' '))
blacklist.extend('msaa _ PANO_20121023_214540.jpg'.split(' '))
# Several of the newest version bmps fail on SkImageDecoder
blacklist.extend('_ image pal8os2v2.bmp'.split(' '))
blacklist.extend('_ image pal8v4.bmp'.split(' '))
blacklist.extend('_ image pal8v5.bmp'.split(' '))
blacklist.extend('_ image rgb16-565.bmp'.split(' '))
blacklist.extend('_ image rgb16-565pal.bmp'.split(' '))
blacklist.extend('_ image rgb32-111110.bmp'.split(' '))
blacklist.extend('_ image rgb32bf.bmp'.split(' '))
blacklist.extend('_ image rgba32.bmp'.split(' '))
blacklist.extend('_ image rgba32abf.bmp'.split(' '))
blacklist.extend('_ image rgb24largepal.bmp'.split(' '))
blacklist.extend('_ image pal8os2v2-16.bmp'.split(' '))
blacklist.extend('_ image pal8oversizepal.bmp'.split(' '))
blacklist.extend('_ subset rgb24largepal.bmp'.split(' '))
blacklist.extend('_ subset pal8os2v2-16.bmp'.split(' '))
blacklist.extend('_ subset pal8oversizepal.bmp'.split(' '))
# New ico files that fail on SkImageDecoder
blacklist.extend('_ image Hopstarter-Mac-Folders-Apple.ico'.split(' '))
# Leon doesn't care about this, so why run it?
if 'Win' in bot:
blacklist.extend('_ image _'.split(' '))