Handle rewinds in SkBmpCodec.
Factor our BMP code for reading the header, and call it after a rewind. BUG=skia:3257 Review URL: https://codereview.chromium.org/1057483003
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@ -105,11 +105,12 @@ SkCodec* SkBmpCodec::NewFromIco(SkStream* stream) {
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/*
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*
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* Creates a bmp decoder
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* Reads enough of the stream to determine the image format
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* Read enough of the stream to initialize the SkBmpCodec. Returns a bool
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* representing success or failure. If it returned true, and codecOut was
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* not NULL, it will be set to a new SkBmpCodec.
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*
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*/
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SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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bool SkBmpCodec::ReadHeader(SkStream* stream, bool isIco, SkCodec** codecOut) {
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// Header size constants
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static const uint32_t kBmpHeaderBytes = 14;
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static const uint32_t kBmpHeaderBytesPlusFour = kBmpHeaderBytes + 4;
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@ -140,14 +141,14 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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if (stream->read(hBuffer.get(), kBmpHeaderBytesPlusFour) !=
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kBmpHeaderBytesPlusFour) {
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SkCodecPrintf("Error: unable to read first bitmap header.\n");
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return NULL;
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return false;
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}
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totalBytes = get_int(hBuffer.get(), 2);
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offset = get_int(hBuffer.get(), 10);
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if (offset < kBmpHeaderBytes + kBmpOS2V1Bytes) {
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SkCodecPrintf("Error: invalid starting location for pixel data\n");
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return NULL;
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return false;
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}
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// The size of the second (info) header in bytes
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@ -156,7 +157,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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infoBytes = get_int(hBuffer.get(), 14);
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if (infoBytes < kBmpOS2V1Bytes) {
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SkCodecPrintf("Error: invalid second header size.\n");
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return NULL;
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return false;
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}
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} else {
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// This value is only used by RLE compression. Bmp in Ico files do not
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@ -174,12 +175,12 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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SkNEW_ARRAY(uint8_t, 4));
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if (stream->read(hBuffer.get(), 4) != 4) {
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SkCodecPrintf("Error: unable to read size of second bitmap header.\n");
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return NULL;
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return false;
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}
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infoBytes = get_int(hBuffer.get(), 0);
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if (infoBytes < kBmpOS2V1Bytes) {
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SkCodecPrintf("Error: invalid second header size.\n");
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return NULL;
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return false;
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}
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}
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@ -191,7 +192,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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SkNEW_ARRAY(uint8_t, infoBytesRemaining));
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if (stream->read(iBuffer.get(), infoBytesRemaining) != infoBytesRemaining) {
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SkCodecPrintf("Error: unable to read second bitmap header.\n");
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return NULL;
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return false;
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}
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// The number of bits used per pixel in the pixel data
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@ -282,7 +283,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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} else {
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// There are no valid bmp headers
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SkCodecPrintf("Error: second bitmap header size is invalid.\n");
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return NULL;
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return false;
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}
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// Check for valid dimensions from header
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@ -300,7 +301,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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if (width < 0 || width >= kBmpMaxDim || height >= kBmpMaxDim) {
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// TODO: Decide if we want to support really large bmps.
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SkCodecPrintf("Error: invalid bitmap dimensions.\n");
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return NULL;
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return false;
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}
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// Create mask struct
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@ -340,7 +341,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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if (stream->read(mBuffer.get(), kBmpMaskBytes) !=
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kBmpMaskBytes) {
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SkCodecPrintf("Error: unable to read bit inputMasks.\n");
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return NULL;
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return false;
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}
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maskBytes = kBmpMaskBytes;
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inputMasks.red = get_int(mBuffer.get(), 0);
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@ -366,10 +367,10 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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// in chromium. I have not come across a test case
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// that uses this format.
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SkCodecPrintf("Error: huffman format unsupported.\n");
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return NULL;
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return false;
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default:
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SkCodecPrintf("Error: invalid bmp bit masks header.\n");
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return NULL;
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return false;
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}
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break;
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case kJpeg_BitmapCompressionMethod:
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@ -383,16 +384,16 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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// It is unsupported in the previous version and
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// in chromium. I think it is used mostly for printers.
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SkCodecPrintf("Error: compression format not supported.\n");
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return NULL;
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return false;
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case kCMYK_BitmapCompressionMethod:
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case kCMYK8BitRLE_BitmapCompressionMethod:
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case kCMYK4BitRLE_BitmapCompressionMethod:
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// TODO: Same as above.
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SkCodecPrintf("Error: CMYK not supported for bitmap decoding.\n");
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return NULL;
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return false;
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default:
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SkCodecPrintf("Error: invalid format for bitmap decoding.\n");
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return NULL;
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return false;
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}
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// Most versions of bmps should be rendered as opaque. Either they do
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@ -447,7 +448,7 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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break;
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default:
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SkCodecPrintf("Error: invalid input value for bits per pixel.\n");
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return NULL;
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return false;
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}
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// Check that input bit masks are valid and create the masks object
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@ -455,13 +456,13 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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masks(SkMasks::CreateMasks(inputMasks, bitsPerPixel));
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if (NULL == masks) {
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SkCodecPrintf("Error: invalid input masks.\n");
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return NULL;
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return false;
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}
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// Check for a valid number of total bytes when in RLE mode
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if (totalBytes <= offset && kRLE_BitmapInputFormat == inputFormat) {
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SkCodecPrintf("Error: RLE requires valid input size.\n");
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return NULL;
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return false;
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}
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const size_t RLEBytes = totalBytes - offset;
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@ -469,19 +470,37 @@ SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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const uint32_t bytesRead = kBmpHeaderBytes + infoBytes + maskBytes;
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if (!isIco && offset < bytesRead) {
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SkCodecPrintf("Error: pixel data offset less than header size.\n");
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return NULL;
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return false;
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}
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if (codecOut) {
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// Return the codec
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// We will use ImageInfo to store width, height, and alpha type. We will
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// set color type to kN32_SkColorType because that should be the default
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// output.
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// We will use ImageInfo to store width, height, and alpha type. We
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// will set color type to kN32_SkColorType because that should be the
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// default output.
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const SkImageInfo& imageInfo = SkImageInfo::Make(width, height,
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kN32_SkColorType, alphaType);
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return SkNEW_ARGS(SkBmpCodec, (imageInfo, stream, bitsPerPixel,
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inputFormat, masks.detach(), numColors,
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bytesPerColor, offset - bytesRead,
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rowOrder, RLEBytes, isIco));
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*codecOut = SkNEW_ARGS(SkBmpCodec, (imageInfo, stream, bitsPerPixel,
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inputFormat, masks.detach(),
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numColors, bytesPerColor,
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offset - bytesRead, rowOrder,
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RLEBytes, isIco));
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}
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return true;
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}
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/*
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*
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* Creates a bmp decoder
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* Reads enough of the stream to determine the image format
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*
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*/
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SkCodec* SkBmpCodec::NewFromStream(SkStream* stream, bool isIco) {
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SkCodec* codec = NULL;
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if (ReadHeader(stream, isIco, &codec)) {
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return codec;
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}
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return NULL;
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}
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/*
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@ -523,7 +542,9 @@ SkCodec::Result SkBmpCodec::onGetPixels(const SkImageInfo& dstInfo,
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if (rewindState == kCouldNotRewind_RewindState) {
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return kCouldNotRewind;
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} else if (rewindState == kRewound_RewindState) {
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return kCouldNotRewind; // TODO(msarett): handle rewinds
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if (!ReadHeader(this->stream(), fIsIco, NULL)) {
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return kCouldNotRewind;
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}
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}
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if (dstInfo.dimensions() != this->getInfo().dimensions()) {
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SkCodecPrintf("Error: scaling not supported.\n");
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@ -98,6 +98,15 @@ private:
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*/
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static SkCodec* NewFromStream(SkStream*, bool isIco);
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/*
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*
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* Read enough of the stream to initialize the SkBmpCodec. Returns a bool
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* representing success or failure. If it returned true, and codecOut was
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* not NULL, it will be set to a new SkBmpCodec.
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*
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*/
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static bool ReadHeader(SkStream*, bool isIco, SkCodec** codecOut);
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/*
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*
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* Performs the bitmap decoding for bit masks input format
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@ -74,8 +74,7 @@ DEF_TEST(Codec, r) {
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check(r, "mandrill.wbmp", SkISize::Make(512, 512), true);
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// BMP
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// TODO (msarett): SkBmpCodec should be able to rewind.
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check(r, "randPixels.bmp", SkISize::Make(8, 8), false);
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check(r, "randPixels.bmp", SkISize::Make(8, 8), true);
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// ICO
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// TODO (msarett): SkIcoCodec should be able to rewind.
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