void WEBPImageDecoder::readColorProfile(const uint8_t* data, size_t size)
{
    WebPChunkIterator chunkIterator;
    WebPData inputData = { data, size };
    WebPDemuxState state;

    WebPDemuxer* demuxer = WebPDemuxPartial(&inputData, &state);
    if (!WebPDemuxGetChunk(demuxer, "ICCP", 1, &chunkIterator)) {
        WebPDemuxReleaseChunkIterator(&chunkIterator);
        WebPDemuxDelete(demuxer);
        return;
    }

    const char* profileData = reinterpret_cast<const char*>(chunkIterator.chunk.bytes);
    size_t profileSize = chunkIterator.chunk.size;

    // Only accept RGB color profiles from input class devices.
    bool ignoreProfile = false;
    if (profileSize < ImageDecoder::iccColorProfileHeaderLength)
        ignoreProfile = true;
    else if (!ImageDecoder::rgbColorProfile(profileData, profileSize))
        ignoreProfile = true;
    else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileSize))
        ignoreProfile = true;

    if (!ignoreProfile)
        createColorTransform(profileData, profileSize);

    WebPDemuxReleaseChunkIterator(&chunkIterator);
    WebPDemuxDelete(demuxer);
}
void WEBPImageDecoder::readColorProfile()
{
    WebPChunkIterator chunkIterator;
    if (!WebPDemuxGetChunk(m_demux, "ICCP", 1, &chunkIterator)) {
        WebPDemuxReleaseChunkIterator(&chunkIterator);
        return;
    }

    const char* profileData = reinterpret_cast<const char*>(chunkIterator.chunk.bytes);
    size_t profileSize = chunkIterator.chunk.size;

    // Only accept RGB color profiles from input class devices.
    bool ignoreProfile = false;
    if (profileSize < ImageDecoder::iccColorProfileHeaderLength)
        ignoreProfile = true;
    else if (!ImageDecoder::rgbColorProfile(profileData, profileSize))
        ignoreProfile = true;
    else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileSize))
        ignoreProfile = true;

    if (!ignoreProfile)
        m_hasColorProfile = createColorTransform(profileData, profileSize);

    WebPDemuxReleaseChunkIterator(&chunkIterator);
}
Beispiel #3
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    bool decode(const SharedBuffer& data, bool onlySize)
    {
        unsigned newByteCount = data.size() - m_bufferLength;
        unsigned readOffset = m_bufferLength - m_info.src->bytes_in_buffer;

        m_info.src->bytes_in_buffer += newByteCount;
        m_info.src->next_input_byte = (JOCTET*)(data.data()) + readOffset;

        // If we still have bytes to skip, try to skip those now.
        if (m_bytesToSkip)
            skipBytes(m_bytesToSkip);

        m_bufferLength = data.size();

        // We need to do the setjmp here. Otherwise bad things will happen
        if (setjmp(m_err.setjmp_buffer))
            return m_decoder->setFailed();

        switch (m_state) {
        case JPEG_HEADER:
            // Read file parameters with jpeg_read_header().
            if (jpeg_read_header(&m_info, true) == JPEG_SUSPENDED)
                return false; // I/O suspension.

            switch (m_info.jpeg_color_space) {
            case JCS_GRAYSCALE:
            case JCS_RGB:
            case JCS_YCbCr:
                // libjpeg can convert GRAYSCALE and YCbCr image pixels to RGB.
                m_info.out_color_space = rgbOutputColorSpace();
#if defined(TURBO_JPEG_RGB_SWIZZLE)
                if (m_info.saw_JFIF_marker)
                    break;
                // FIXME: Swizzle decoding does not support Adobe transform=0
                // images (yet), so revert to using JSC_RGB in that case.
                if (m_info.saw_Adobe_marker && !m_info.Adobe_transform)
                    m_info.out_color_space = JCS_RGB;
#endif
                break;
            case JCS_CMYK:
            case JCS_YCCK:
                // libjpeg can convert YCCK to CMYK, but neither to RGB, so we
                // manually convert CMKY to RGB.
                m_info.out_color_space = JCS_CMYK;
                break;
            default:
                return m_decoder->setFailed();
            }

            m_state = JPEG_START_DECOMPRESS;

            // We can fill in the size now that the header is available.
            if (!m_decoder->setSize(m_info.image_width, m_info.image_height))
                return false;

            // Calculate and set decoded size.
            m_info.scale_num = m_decoder->desiredScaleNumerator();
            m_info.scale_denom = scaleDenominator;
            jpeg_calc_output_dimensions(&m_info);
            m_decoder->setDecodedSize(m_info.output_width, m_info.output_height);

            m_decoder->setOrientation(readImageOrientation(info()));

#if USE(QCMSLIB)
            // Allow color management of the decoded RGBA pixels if possible.
            if (!m_decoder->ignoresGammaAndColorProfile()) {
                ColorProfile colorProfile;
                readColorProfile(info(), colorProfile);
                createColorTransform(colorProfile, colorSpaceHasAlpha(m_info.out_color_space));
#if defined(TURBO_JPEG_RGB_SWIZZLE)
                // Input RGBA data to qcms. Note: restored to BGRA on output.
                if (m_transform && m_info.out_color_space == JCS_EXT_BGRA)
                    m_info.out_color_space = JCS_EXT_RGBA;
#endif
            }
#endif
            // Don't allocate a giant and superfluous memory buffer when the
            // image is a sequential JPEG.
            m_info.buffered_image = jpeg_has_multiple_scans(&m_info);

            if (onlySize) {
                // We can stop here. Reduce our buffer length and available data.
                m_bufferLength -= m_info.src->bytes_in_buffer;
                m_info.src->bytes_in_buffer = 0;
                return true;
            }
        // FALL THROUGH

        case JPEG_START_DECOMPRESS:
            // Set parameters for decompression.
            // FIXME -- Should reset dct_method and dither mode for final pass
            // of progressive JPEG.
            m_info.dct_method = dctMethod();
            m_info.dither_mode = ditherMode();
            m_info.do_fancy_upsampling = doFancyUpsampling();
            m_info.enable_2pass_quant = false;
            m_info.do_block_smoothing = true;

            // Make a one-row-high sample array that will go away when done with
            // image. Always make it big enough to hold an RGB row. Since this
            // uses the IJG memory manager, it must be allocated before the call
            // to jpeg_start_compress().
            // FIXME: note that some output color spaces do not need the samples
            // buffer. Remove this allocation for those color spaces.
            m_samples = (*m_info.mem->alloc_sarray)(reinterpret_cast<j_common_ptr>(&m_info), JPOOL_IMAGE, m_info.output_width * 4, 1);

            // Start decompressor.
            if (!jpeg_start_decompress(&m_info))
                return false; // I/O suspension.

            // If this is a progressive JPEG ...
            m_state = (m_info.buffered_image) ? JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL;
        // FALL THROUGH

        case JPEG_DECOMPRESS_SEQUENTIAL:
            if (m_state == JPEG_DECOMPRESS_SEQUENTIAL) {

                if (!m_decoder->outputScanlines())
                    return false; // I/O suspension.

                // If we've completed image output...
                ASSERT(m_info.output_scanline == m_info.output_height);
                m_state = JPEG_DONE;
            }
        // FALL THROUGH

        case JPEG_DECOMPRESS_PROGRESSIVE:
            if (m_state == JPEG_DECOMPRESS_PROGRESSIVE) {
                int status;
                do {
                    status = jpeg_consume_input(&m_info);
                } while ((status != JPEG_SUSPENDED) && (status != JPEG_REACHED_EOI));

                for (;;) {
                    if (!m_info.output_scanline) {
                        int scan = m_info.input_scan_number;

                        // If we haven't displayed anything yet
                        // (output_scan_number == 0) and we have enough data for
                        // a complete scan, force output of the last full scan.
                        if (!m_info.output_scan_number && (scan > 1) && (status != JPEG_REACHED_EOI))
                            --scan;

                        if (!jpeg_start_output(&m_info, scan))
                            return false; // I/O suspension.
                    }

                    if (m_info.output_scanline == 0xffffff)
                        m_info.output_scanline = 0;

                    // If outputScanlines() fails, it deletes |this|. Therefore,
                    // copy the decoder pointer and use it to check for failure
                    // to avoid member access in the failure case.
                    JPEGImageDecoder* decoder = m_decoder;
                    if (!decoder->outputScanlines()) {
                        if (decoder->failed()) // Careful; |this| is deleted.
                            return false;
                        if (!m_info.output_scanline)
                            // Didn't manage to read any lines - flag so we
                            // don't call jpeg_start_output() multiple times for
                            // the same scan.
                            m_info.output_scanline = 0xffffff;
                        return false; // I/O suspension.
                    }

                    if (m_info.output_scanline == m_info.output_height) {
                        if (!jpeg_finish_output(&m_info))
                            return false; // I/O suspension.

                        if (jpeg_input_complete(&m_info) && (m_info.input_scan_number == m_info.output_scan_number))
                            break;

                        m_info.output_scanline = 0;
                    }
                }

                m_state = JPEG_DONE;
            }
        // FALL THROUGH

        case JPEG_DONE:
            // Finish decompression.
            return jpeg_finish_decompress(&m_info);

        case JPEG_ERROR:
            // We can get here if the constructor failed.
            return m_decoder->setFailed();
        }

        return true;
    }