void createColorTransform(const ColorProfile& colorProfile, bool hasAlpha, bool sRGB)
    {
        clearColorTransform();

        if (colorProfile.isEmpty() && !sRGB)
            return;
        qcms_profile* deviceProfile = ImageDecoder::qcmsOutputDeviceProfile();
        if (!deviceProfile)
            return;
        qcms_profile* inputProfile = 0;
        if (!colorProfile.isEmpty())
            inputProfile = qcms_profile_from_memory(colorProfile.data(), colorProfile.size());
        else
            inputProfile = qcms_profile_sRGB();
        if (!inputProfile)
            return;

        // We currently only support color profiles for RGB and RGBA images.
        ASSERT(rgbData == qcms_profile_get_color_space(inputProfile));

        if (qcms_profile_match(inputProfile, deviceProfile)) {
            qcms_profile_release(inputProfile);
            return;
        }

        // FIXME: Don't force perceptual intent if the image profile contains an intent.
        qcms_data_type dataFormat = hasAlpha ? QCMS_DATA_RGBA_8 : QCMS_DATA_RGB_8;
        m_transform = qcms_transform_create(inputProfile, dataFormat, deviceProfile, dataFormat, QCMS_INTENT_PERCEPTUAL);

        qcms_profile_release(inputProfile);
    }
static void getColorProfile(png_structp png, png_infop info, ColorProfile& colorProfile, bool& sRGB)
{
#ifdef PNG_iCCP_SUPPORTED
    ASSERT(colorProfile.isEmpty());
    if (png_get_valid(png, info, PNG_INFO_sRGB)) {
        sRGB = true;
        return;
    }

    char* profileName;
    int compressionType;
#if (PNG_LIBPNG_VER < 10500)
    png_charp profile;
#else
    png_bytep profile;
#endif
    png_uint_32 profileLength;
    if (!png_get_iCCP(png, info, &profileName, &compressionType, &profile, &profileLength))
        return;

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

    if (!ignoreProfile)
        colorProfile.append(profileData, profileLength);
#endif
}
static void readColorProfile(jpeg_decompress_struct* info, ColorProfile& colorProfile)
{
#if USE(ICCJPEG)
    JOCTET* profile;
    unsigned profileLength;

    if (!read_icc_profile(info, &profile, &profileLength))
        return;

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

    ASSERT(colorProfile.isEmpty());
    if (!ignoreProfile)
        colorProfile.append(profileData, profileLength);
    free(profile);
#endif
}
    void createColorTransform(const ColorProfile& colorProfile, bool hasAlpha)
    {
        if (m_transform)
            qcms_transform_release(m_transform);
        m_transform = 0;

        if (colorProfile.isEmpty())
            return;
        qcms_profile* deviceProfile = ImageDecoder::qcmsOutputDeviceProfile();
        if (!deviceProfile)
            return;
        qcms_profile* inputProfile = qcms_profile_from_memory(colorProfile.data(), colorProfile.size());
        if (!inputProfile)
            return;
        // We currently only support color profiles for RGB profiled images.
        ASSERT(icSigRgbData == qcms_profile_get_color_space(inputProfile));
        qcms_data_type dataFormat = hasAlpha ? QCMS_DATA_RGBA_8 : QCMS_DATA_RGB_8;
        // FIXME: Don't force perceptual intent if the image profile contains an intent.
        m_transform = qcms_transform_create(inputProfile, dataFormat, deviceProfile, dataFormat, QCMS_INTENT_PERCEPTUAL);
        qcms_profile_release(inputProfile);
    }
Exemple #5
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    bool decode(const SharedBuffer& data, bool onlySize)
    {
        m_decodingSizeOnly = 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();
                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();
            }

            // 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);

            // Used to set up image size so arrays can be allocated.
            jpeg_calc_output_dimensions(&m_info);

            // 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().
            m_samples = (*m_info.mem->alloc_sarray)((j_common_ptr) &m_info, JPOOL_IMAGE, m_info.output_width * 4, 1);

            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;

            // Allow color management of the decoded RGBA pixels if possible.
            if (!m_decoder->ignoresGammaAndColorProfile()) {
                ColorProfile rgbInputDeviceColorProfile = readColorProfile(info());
                if (!rgbInputDeviceColorProfile.isEmpty())
                    m_decoder->setColorProfile(rgbInputDeviceColorProfile);
            }

            if (m_decodingSizeOnly) {
                // 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 =  JDCT_ISLOW;
            m_info.dither_mode = JDITHER_FS;
            m_info.do_fancy_upsampling = true;
            m_info.enable_2pass_quant = false;
            m_info.do_block_smoothing = true;

            // 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 (!m_decoder->outputScanlines()) {
                        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;
    }
    bool decode(const SharedBuffer& data, bool onlySize)
    {
        m_decodingSizeOnly = 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;

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

#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING) && defined(TURBO_JPEG_RGB_SWIZZLE)
            // There's no point swizzle decoding if image down sampling will
            // be applied. Revert to using JSC_RGB in that case.
            if (m_decoder->willDownSample() && turboSwizzled(m_info.out_color_space))
                m_info.out_color_space = JCS_RGB;
#endif
            // Allow color management of the decoded RGBA pixels if possible.
            if (!m_decoder->ignoresGammaAndColorProfile()) {
                ColorProfile rgbInputDeviceColorProfile = readColorProfile(info());
                if (!rgbInputDeviceColorProfile.isEmpty())
                    m_decoder->setColorProfile(rgbInputDeviceColorProfile);
#if USE(QCMSLIB)
                createColorTransform(rgbInputDeviceColorProfile, 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);

            // Used to set up image size so arrays can be allocated.
            jpeg_calc_output_dimensions(&m_info);

            // 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)((j_common_ptr) &m_info, JPOOL_IMAGE, m_info.output_width * 4, 1);

            if (m_decodingSizeOnly) {
                // 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() ? TRUE : FALSE;
            m_info.enable_2pass_quant = FALSE;
            m_info.do_block_smoothing = TRUE;

            // 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;
    }