Пример #1
0
GLOBAL int
jpeg_read_header (j_decompress_ptr cinfo, boolean require_image)
{
  int retcode;

  if (cinfo->global_state != DSTATE_START &&
      cinfo->global_state != DSTATE_INHEADER)
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

  retcode = jpeg_consume_input(cinfo);

  switch (retcode) {
  case JPEG_REACHED_SOS:
    retcode = JPEG_HEADER_OK;
    break;
  case JPEG_REACHED_EOI:
    if (require_image)		/* Complain if application wanted an image */
      ERREXIT(cinfo, JERR_NO_IMAGE);
    /* Reset to start state; it would be safer to require the application to
     * call jpeg_abort, but we can't change it now for compatibility reasons.
     * A side effect is to free any temporary memory (there shouldn't be any).
     */
    jpeg_abort((j_common_ptr) cinfo); /* sets state = DSTATE_START */
    retcode = JPEG_HEADER_TABLES_ONLY;
    break;
  case JPEG_SUSPENDED:
    /* no work */
    break;
  }

  return retcode;
}
Пример #2
0
void
nsJPEGDecoder::WriteInternal(const char* aBuffer, uint32_t aCount,
                             DecodeStrategy)
{
  mSegment = (const JOCTET*)aBuffer;
  mSegmentLen = aCount;

  NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");

  // Return here if there is a fatal error within libjpeg.
  nsresult error_code;
  // This cast to nsresult makes sense because setjmp() returns whatever we
  // passed to longjmp(), which was actually an nsresult.
  if ((error_code = (nsresult)setjmp(mErr.setjmp_buffer)) != NS_OK) {
    if (error_code == NS_ERROR_FAILURE) {
      PostDataError();
      // Error due to corrupt stream - return NS_OK and consume silently
      // so that ImageLib doesn't throw away a partial image load
      mState = JPEG_SINK_NON_JPEG_TRAILER;
      PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
             ("} (setjmp returned NS_ERROR_FAILURE)"));
      return;
    } else {
      // Error due to reasons external to the stream (probably out of
      // memory) - let ImageLib attempt to clean up, even though
      // mozilla is seconds away from falling flat on its face.
      PostDecoderError(error_code);
      mState = JPEG_ERROR;
      PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
             ("} (setjmp returned an error)"));
      return;
    }
  }

  PR_LOG(GetJPEGLog(), PR_LOG_DEBUG,
         ("[this=%p] nsJPEGDecoder::Write -- processing JPEG data\n", this));

  switch (mState) {
    case JPEG_HEADER: {
      LOG_SCOPE(GetJPEGLog(), "nsJPEGDecoder::Write -- entering JPEG_HEADER"
                " case");

      // Step 3: read file parameters with jpeg_read_header()
      if (jpeg_read_header(&mInfo, TRUE) == JPEG_SUSPENDED) {
        PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
               ("} (JPEG_SUSPENDED)"));
        return; // I/O suspension
      }

      int sampleSize = mImage.GetRequestedSampleSize();
      if (sampleSize > 0) {
        mInfo.scale_num = 1;
        mInfo.scale_denom = sampleSize;
      }

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

      // Post our size to the superclass
      PostSize(mInfo.output_width, mInfo.output_height,
               ReadOrientationFromEXIF());
      if (HasError()) {
        // Setting the size led to an error.
        mState = JPEG_ERROR;
        return;
      }

      // If we're doing a size decode, we're done.
      if (IsSizeDecode()) {
        return;
      }

      // We're doing a full decode.
      if (mCMSMode != eCMSMode_Off &&
          (mInProfile = GetICCProfile(mInfo)) != nullptr) {
        uint32_t profileSpace = qcms_profile_get_color_space(mInProfile);
        bool mismatch = false;

#ifdef DEBUG_tor
      fprintf(stderr, "JPEG profileSpace: 0x%08X\n", profileSpace);
#endif
      switch (mInfo.jpeg_color_space) {
        case JCS_GRAYSCALE:
          if (profileSpace == icSigRgbData) {
            mInfo.out_color_space = JCS_RGB;
          } else if (profileSpace != icSigGrayData) {
            mismatch = true;
          }
          break;
        case JCS_RGB:
          if (profileSpace != icSigRgbData) {
            mismatch =  true;
          }
          break;
        case JCS_YCbCr:
          if (profileSpace == icSigRgbData) {
            mInfo.out_color_space = JCS_RGB;
          } else {
            // qcms doesn't support ycbcr
            mismatch = true;
          }
          break;
        case JCS_CMYK:
        case JCS_YCCK:
            // qcms doesn't support cmyk
            mismatch = true;
          break;
        default:
          mState = JPEG_ERROR;
          PostDataError();
          PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                 ("} (unknown colorpsace (1))"));
          return;
      }

      if (!mismatch) {
        qcms_data_type type;
        switch (mInfo.out_color_space) {
          case JCS_GRAYSCALE:
            type = QCMS_DATA_GRAY_8;
            break;
          case JCS_RGB:
            type = QCMS_DATA_RGB_8;
            break;
          default:
            mState = JPEG_ERROR;
            PostDataError();
            PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                   ("} (unknown colorpsace (2))"));
            return;
        }
#if 0
        // We don't currently support CMYK profiles. The following
        // code dealt with lcms types. Add something like this
        // back when we gain support for CMYK.

        // Adobe Photoshop writes YCCK/CMYK files with inverted data
        if (mInfo.out_color_space == JCS_CMYK) {
          type |= FLAVOR_SH(mInfo.saw_Adobe_marker ? 1 : 0);
        }
#endif

        if (gfxPlatform::GetCMSOutputProfile()) {

          // Calculate rendering intent.
          int intent = gfxPlatform::GetRenderingIntent();
          if (intent == -1) {
            intent = qcms_profile_get_rendering_intent(mInProfile);
          }

          // Create the color management transform.
          mTransform = qcms_transform_create(mInProfile,
                                          type,
                                          gfxPlatform::GetCMSOutputProfile(),
                                          QCMS_DATA_RGB_8,
                                          (qcms_intent)intent);
        }
      } else {
#ifdef DEBUG_tor
        fprintf(stderr, "ICM profile colorspace mismatch\n");
#endif
      }
    }

    if (!mTransform) {
      switch (mInfo.jpeg_color_space) {
        case JCS_GRAYSCALE:
        case JCS_RGB:
        case JCS_YCbCr:
          // if we're not color managing we can decode directly to
          // MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB
          if (mCMSMode != eCMSMode_All) {
              mInfo.out_color_space = MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB;
              mInfo.out_color_components = 4;
          } else {
              mInfo.out_color_space = JCS_RGB;
          }
          break;
        case JCS_CMYK:
        case JCS_YCCK:
          // libjpeg can convert from YCCK to CMYK, but not to RGB
          mInfo.out_color_space = JCS_CMYK;
          break;
        default:
          mState = JPEG_ERROR;
          PostDataError();
          PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                 ("} (unknown colorpsace (3))"));
          return;
          break;
      }
    }

    // Don't allocate a giant and superfluous memory buffer
    // when not doing a progressive decode.
    mInfo.buffered_image = mDecodeStyle == PROGRESSIVE &&
                           jpeg_has_multiple_scans(&mInfo);

    if (!mImageData) {
      mState = JPEG_ERROR;
      PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
      PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
             ("} (could not initialize image frame)"));
      return;
    }

    PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
           ("        JPEGDecoderAccounting: nsJPEGDecoder::"
            "Write -- created image frame with %ux%u pixels",
            mInfo.output_width, mInfo.output_height));

    mState = JPEG_START_DECOMPRESS;
  }

  case JPEG_START_DECOMPRESS: {
    LOG_SCOPE(GetJPEGLog(), "nsJPEGDecoder::Write -- entering"
                            " JPEG_START_DECOMPRESS case");
    // Step 4: set parameters for decompression

    // FIXME -- Should reset dct_method and dither mode
    // for final pass of progressive JPEG

    mInfo.dct_method =  JDCT_ISLOW;
    mInfo.dither_mode = JDITHER_FS;
    mInfo.do_fancy_upsampling = TRUE;
    mInfo.enable_2pass_quant = FALSE;
    mInfo.do_block_smoothing = TRUE;

    // Step 5: Start decompressor
    if (jpeg_start_decompress(&mInfo) == FALSE) {
      PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
             ("} (I/O suspension after jpeg_start_decompress())"));
      return; // I/O suspension
    }


    // If this is a progressive JPEG ...
    mState = mInfo.buffered_image ?
             JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL;
  }

  case JPEG_DECOMPRESS_SEQUENTIAL: {
    if (mState == JPEG_DECOMPRESS_SEQUENTIAL) {
      LOG_SCOPE(GetJPEGLog(), "nsJPEGDecoder::Write -- "
                              "JPEG_DECOMPRESS_SEQUENTIAL case");

      bool suspend;
      OutputScanlines(&suspend);

      if (suspend) {
        PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
               ("} (I/O suspension after OutputScanlines() - SEQUENTIAL)"));
        return; // I/O suspension
      }

      // If we've completed image output ...
      NS_ASSERTION(mInfo.output_scanline == mInfo.output_height,
                   "We didn't process all of the data!");
      mState = JPEG_DONE;
    }
  }

  case JPEG_DECOMPRESS_PROGRESSIVE: {
    if (mState == JPEG_DECOMPRESS_PROGRESSIVE) {
      LOG_SCOPE(GetJPEGLog(),
                "nsJPEGDecoder::Write -- JPEG_DECOMPRESS_PROGRESSIVE case");

      int status;
      do {
        status = jpeg_consume_input(&mInfo);
      } while ((status != JPEG_SUSPENDED) &&
               (status != JPEG_REACHED_EOI));

      for (;;) {
        if (mInfo.output_scanline == 0) {
          int scan = mInfo.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 ((mInfo.output_scan_number == 0) &&
              (scan > 1) &&
              (status != JPEG_REACHED_EOI))
            scan--;

          if (!jpeg_start_output(&mInfo, scan)) {
            PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                   ("} (I/O suspension after jpeg_start_output() -"
                    " PROGRESSIVE)"));
            return; // I/O suspension
          }
        }

        if (mInfo.output_scanline == 0xffffff) {
          mInfo.output_scanline = 0;
        }

        bool suspend;
        OutputScanlines(&suspend);

        if (suspend) {
          if (mInfo.output_scanline == 0) {
            // didn't manage to read any lines - flag so we don't call
            // jpeg_start_output() multiple times for the same scan
            mInfo.output_scanline = 0xffffff;
          }
          PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                 ("} (I/O suspension after OutputScanlines() - PROGRESSIVE)"));
          return; // I/O suspension
        }

        if (mInfo.output_scanline == mInfo.output_height) {
          if (!jpeg_finish_output(&mInfo)) {
            PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
                   ("} (I/O suspension after jpeg_finish_output() -"
                    " PROGRESSIVE)"));
            return; // I/O suspension
          }

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

          mInfo.output_scanline = 0;
        }
      }

      mState = JPEG_DONE;
    }
  }

  case JPEG_DONE: {
    LOG_SCOPE(GetJPEGLog(), "nsJPEGDecoder::ProcessData -- entering"
                            " JPEG_DONE case");

    // Step 7: Finish decompression

    if (jpeg_finish_decompress(&mInfo) == FALSE) {
      PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
             ("} (I/O suspension after jpeg_finish_decompress() - DONE)"));
      return; // I/O suspension
    }

    mState = JPEG_SINK_NON_JPEG_TRAILER;

    // we're done dude
    break;
  }
  case JPEG_SINK_NON_JPEG_TRAILER:
    PR_LOG(GetJPEGLog(), PR_LOG_DEBUG,
           ("[this=%p] nsJPEGDecoder::ProcessData -- entering"
            " JPEG_SINK_NON_JPEG_TRAILER case\n", this));

    break;

  case JPEG_ERROR:
    NS_ABORT_IF_FALSE(0, "Should always return immediately after error and"
                         " not re-enter decoder");
  }

  PR_LOG(GetJPEGDecoderAccountingLog(), PR_LOG_DEBUG,
         ("} (end of function)"));
  return;
}
Пример #3
0
    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;
    }
Пример #4
0
    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;
    }
Пример #5
0
LexerTransition<nsJPEGDecoder::State>
nsJPEGDecoder::ReadJPEGData(const char* aData, size_t aLength)
{
  mSegment = reinterpret_cast<const JOCTET*>(aData);
  mSegmentLen = aLength;

  // Return here if there is a fatal error within libjpeg.
  nsresult error_code;
  // This cast to nsresult makes sense because setjmp() returns whatever we
  // passed to longjmp(), which was actually an nsresult.
  if ((error_code = static_cast<nsresult>(setjmp(mErr.setjmp_buffer))) != NS_OK) {
    if (error_code == NS_ERROR_FAILURE) {
      // Error due to corrupt data. Make sure that we don't feed any more data
      // to libjpeg-turbo.
      mState = JPEG_SINK_NON_JPEG_TRAILER;
      MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
             ("} (setjmp returned NS_ERROR_FAILURE)"));
    } else {
      // Error for another reason. (Possibly OOM.)
      PostDecoderError(error_code);
      mState = JPEG_ERROR;
      MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
             ("} (setjmp returned an error)"));
    }

    return Transition::TerminateFailure();
  }

  MOZ_LOG(sJPEGLog, LogLevel::Debug,
         ("[this=%p] nsJPEGDecoder::Write -- processing JPEG data\n", this));

  switch (mState) {
    case JPEG_HEADER: {
      LOG_SCOPE((mozilla::LogModule*)sJPEGLog, "nsJPEGDecoder::Write -- entering JPEG_HEADER"
                " case");

      // Step 3: read file parameters with jpeg_read_header()
      if (jpeg_read_header(&mInfo, TRUE) == JPEG_SUSPENDED) {
        MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
               ("} (JPEG_SUSPENDED)"));
        return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
      }

      // If we have a sample size specified for -moz-sample-size, use it.
      if (mSampleSize > 0) {
        mInfo.scale_num = 1;
        mInfo.scale_denom = mSampleSize;
      }

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

      // Post our size to the superclass
      PostSize(mInfo.output_width, mInfo.output_height,
               ReadOrientationFromEXIF());
      if (HasError()) {
        // Setting the size led to an error.
        mState = JPEG_ERROR;
        return Transition::TerminateFailure();
      }

      // If we're doing a metadata decode, we're done.
      if (IsMetadataDecode()) {
        return Transition::TerminateSuccess();
      }

      // We're doing a full decode.
      if (mCMSMode != eCMSMode_Off &&
          (mInProfile = GetICCProfile(mInfo)) != nullptr) {
        uint32_t profileSpace = qcms_profile_get_color_space(mInProfile);
        bool mismatch = false;

#ifdef DEBUG_tor
      fprintf(stderr, "JPEG profileSpace: 0x%08X\n", profileSpace);
#endif
      switch (mInfo.jpeg_color_space) {
        case JCS_GRAYSCALE:
          if (profileSpace == icSigRgbData) {
            mInfo.out_color_space = JCS_RGB;
          } else if (profileSpace != icSigGrayData) {
            mismatch = true;
          }
          break;
        case JCS_RGB:
          if (profileSpace != icSigRgbData) {
            mismatch =  true;
          }
          break;
        case JCS_YCbCr:
          if (profileSpace == icSigRgbData) {
            mInfo.out_color_space = JCS_RGB;
          } else {
            // qcms doesn't support ycbcr
            mismatch = true;
          }
          break;
        case JCS_CMYK:
        case JCS_YCCK:
            // qcms doesn't support cmyk
            mismatch = true;
          break;
        default:
          mState = JPEG_ERROR;
          PostDataError();
          MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                 ("} (unknown colorpsace (1))"));
          return Transition::TerminateFailure();
      }

      if (!mismatch) {
        qcms_data_type type;
        switch (mInfo.out_color_space) {
          case JCS_GRAYSCALE:
            type = QCMS_DATA_GRAY_8;
            break;
          case JCS_RGB:
            type = QCMS_DATA_RGB_8;
            break;
          default:
            mState = JPEG_ERROR;
            PostDataError();
            MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                   ("} (unknown colorpsace (2))"));
            return Transition::TerminateFailure();
        }
#if 0
        // We don't currently support CMYK profiles. The following
        // code dealt with lcms types. Add something like this
        // back when we gain support for CMYK.

        // Adobe Photoshop writes YCCK/CMYK files with inverted data
        if (mInfo.out_color_space == JCS_CMYK) {
          type |= FLAVOR_SH(mInfo.saw_Adobe_marker ? 1 : 0);
        }
#endif

        if (gfxPlatform::GetCMSOutputProfile()) {

          // Calculate rendering intent.
          int intent = gfxPlatform::GetRenderingIntent();
          if (intent == -1) {
            intent = qcms_profile_get_rendering_intent(mInProfile);
          }

          // Create the color management transform.
          mTransform = qcms_transform_create(mInProfile,
                                          type,
                                          gfxPlatform::GetCMSOutputProfile(),
                                          QCMS_DATA_RGB_8,
                                          (qcms_intent)intent);
        }
      } else {
#ifdef DEBUG_tor
        fprintf(stderr, "ICM profile colorspace mismatch\n");
#endif
      }
    }

    if (!mTransform) {
      switch (mInfo.jpeg_color_space) {
        case JCS_GRAYSCALE:
        case JCS_RGB:
        case JCS_YCbCr:
          // if we're not color managing we can decode directly to
          // MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB
          if (mCMSMode != eCMSMode_All) {
              mInfo.out_color_space = MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB;
              mInfo.out_color_components = 4;
          } else {
              mInfo.out_color_space = JCS_RGB;
          }
          break;
        case JCS_CMYK:
        case JCS_YCCK:
          // libjpeg can convert from YCCK to CMYK, but not to RGB
          mInfo.out_color_space = JCS_CMYK;
          break;
        default:
          mState = JPEG_ERROR;
          PostDataError();
          MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                 ("} (unknown colorpsace (3))"));
          return Transition::TerminateFailure();
      }
    }

    // Don't allocate a giant and superfluous memory buffer
    // when not doing a progressive decode.
    mInfo.buffered_image = mDecodeStyle == PROGRESSIVE &&
                           jpeg_has_multiple_scans(&mInfo);

    MOZ_ASSERT(!mImageData, "Already have a buffer allocated?");
    nsIntSize targetSize = mDownscaler ? mDownscaler->TargetSize() : GetSize();
    nsresult rv = AllocateFrame(0, targetSize,
                                nsIntRect(nsIntPoint(), targetSize),
                                gfx::SurfaceFormat::B8G8R8A8);
    if (NS_FAILED(rv)) {
      mState = JPEG_ERROR;
      MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
             ("} (could not initialize image frame)"));
      return Transition::TerminateFailure();
    }

    MOZ_ASSERT(mImageData, "Should have a buffer now");

    if (mDownscaler) {
      nsresult rv = mDownscaler->BeginFrame(GetSize(), Nothing(),
                                            mImageData,
                                            /* aHasAlpha = */ false);
      if (NS_FAILED(rv)) {
        mState = JPEG_ERROR;
        return Transition::TerminateFailure();
      }
    }

    MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
           ("        JPEGDecoderAccounting: nsJPEGDecoder::"
            "Write -- created image frame with %ux%u pixels",
            mInfo.output_width, mInfo.output_height));

    mState = JPEG_START_DECOMPRESS;
    MOZ_FALLTHROUGH; // to start decompressing.
  }

  case JPEG_START_DECOMPRESS: {
    LOG_SCOPE((mozilla::LogModule*)sJPEGLog, "nsJPEGDecoder::Write -- entering"
                            " JPEG_START_DECOMPRESS case");
    // Step 4: set parameters for decompression

    // FIXME -- Should reset dct_method and dither mode
    // for final pass of progressive JPEG

    mInfo.dct_method =  JDCT_ISLOW;
    mInfo.dither_mode = JDITHER_FS;
    mInfo.do_fancy_upsampling = TRUE;
    mInfo.enable_2pass_quant = FALSE;
    mInfo.do_block_smoothing = TRUE;

    // Step 5: Start decompressor
    if (jpeg_start_decompress(&mInfo) == FALSE) {
      MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
             ("} (I/O suspension after jpeg_start_decompress())"));
      return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
    }

    // If this is a progressive JPEG ...
    mState = mInfo.buffered_image ?
             JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL;
    MOZ_FALLTHROUGH; // to decompress sequential JPEG.
  }

  case JPEG_DECOMPRESS_SEQUENTIAL: {
    if (mState == JPEG_DECOMPRESS_SEQUENTIAL) {
      LOG_SCOPE((mozilla::LogModule*)sJPEGLog, "nsJPEGDecoder::Write -- "
                              "JPEG_DECOMPRESS_SEQUENTIAL case");

      bool suspend;
      OutputScanlines(&suspend);

      if (suspend) {
        MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
               ("} (I/O suspension after OutputScanlines() - SEQUENTIAL)"));
        return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
      }

      // If we've completed image output ...
      NS_ASSERTION(mInfo.output_scanline == mInfo.output_height,
                   "We didn't process all of the data!");
      mState = JPEG_DONE;
    }
    MOZ_FALLTHROUGH; // to decompress progressive JPEG.
  }

  case JPEG_DECOMPRESS_PROGRESSIVE: {
    if (mState == JPEG_DECOMPRESS_PROGRESSIVE) {
      LOG_SCOPE((mozilla::LogModule*)sJPEGLog,
                "nsJPEGDecoder::Write -- JPEG_DECOMPRESS_PROGRESSIVE case");

      int status;
      do {
        status = jpeg_consume_input(&mInfo);
      } while ((status != JPEG_SUSPENDED) &&
               (status != JPEG_REACHED_EOI));

      for (;;) {
        if (mInfo.output_scanline == 0) {
          int scan = mInfo.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 ((mInfo.output_scan_number == 0) &&
              (scan > 1) &&
              (status != JPEG_REACHED_EOI))
            scan--;

          if (!jpeg_start_output(&mInfo, scan)) {
            MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                   ("} (I/O suspension after jpeg_start_output() -"
                    " PROGRESSIVE)"));
            return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
          }
        }

        if (mInfo.output_scanline == 0xffffff) {
          mInfo.output_scanline = 0;
        }

        bool suspend;
        OutputScanlines(&suspend);

        if (suspend) {
          if (mInfo.output_scanline == 0) {
            // didn't manage to read any lines - flag so we don't call
            // jpeg_start_output() multiple times for the same scan
            mInfo.output_scanline = 0xffffff;
          }
          MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                 ("} (I/O suspension after OutputScanlines() - PROGRESSIVE)"));
          return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
        }

        if (mInfo.output_scanline == mInfo.output_height) {
          if (!jpeg_finish_output(&mInfo)) {
            MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
                   ("} (I/O suspension after jpeg_finish_output() -"
                    " PROGRESSIVE)"));
            return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
          }

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

          mInfo.output_scanline = 0;
          if (mDownscaler) {
            mDownscaler->ResetForNextProgressivePass();
          }
        }
      }

      mState = JPEG_DONE;
    }
    MOZ_FALLTHROUGH; // to finish decompressing.
  }

  case JPEG_DONE: {
    LOG_SCOPE((mozilla::LogModule*)sJPEGLog, "nsJPEGDecoder::ProcessData -- entering"
                            " JPEG_DONE case");

    // Step 7: Finish decompression

    if (jpeg_finish_decompress(&mInfo) == FALSE) {
      MOZ_LOG(sJPEGDecoderAccountingLog, LogLevel::Debug,
             ("} (I/O suspension after jpeg_finish_decompress() - DONE)"));
      return Transition::ContinueUnbuffered(State::JPEG_DATA); // I/O suspension
    }

    // Make sure we don't feed any more data to libjpeg-turbo.
    mState = JPEG_SINK_NON_JPEG_TRAILER;

    // We're done.
    return Transition::TerminateSuccess();
  }
  case JPEG_SINK_NON_JPEG_TRAILER:
    MOZ_LOG(sJPEGLog, LogLevel::Debug,
           ("[this=%p] nsJPEGDecoder::ProcessData -- entering"
            " JPEG_SINK_NON_JPEG_TRAILER case\n", this));

    MOZ_ASSERT_UNREACHABLE("Should stop getting data after entering state "
                           "JPEG_SINK_NON_JPEG_TRAILER");

    return Transition::TerminateSuccess();

  case JPEG_ERROR:
    MOZ_ASSERT_UNREACHABLE("Should stop getting data after entering state "
                           "JPEG_ERROR");

    return Transition::TerminateFailure();
  }

  MOZ_ASSERT_UNREACHABLE("Escaped the JPEG decoder state machine");
  return Transition::TerminateFailure();
}
Пример #6
0
    bool decode(const Vector<char>& data, bool sizeOnly) {
        m_decodingSizeOnly = sizeOnly;
        
        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)) {
            m_state = JPEG_SINK_NON_JPEG_TRAILER;
            close();
            return false;
        }

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

                /* let libjpeg take care of gray->RGB and YCbCr->RGB conversions */
                switch (m_info.jpeg_color_space) {
                    case JCS_GRAYSCALE:
                    case JCS_RGB:
                    case JCS_YCbCr:
                        m_info.out_color_space = JCS_RGB;
                        break;
                    case JCS_CMYK:
                    case JCS_YCCK:
                    default:
                        m_state = JPEG_ERROR;
                        return false;
                }

                /*
                 * 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().
                 */
                int row_stride = m_info.output_width * 4; // RGBA buffer


                m_samples = (*m_info.mem->alloc_sarray)((j_common_ptr) &m_info,
                                           JPOOL_IMAGE,
                                           row_stride, 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)) {
                    m_state = JPEG_ERROR;
                    return false;
                }

                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;
                }
            }

            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 true; /* I/O suspension */

                /* If this is a progressive JPEG ... */
                m_state = (m_info.buffered_image) ? JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL;
            }
    
            case JPEG_DECOMPRESS_SEQUENTIAL:
            {
                if (m_state == JPEG_DECOMPRESS_SEQUENTIAL) {
      
                    if (!m_decoder->outputScanlines())
                        return true; /* I/O suspension */
      
                    /* If we've completed image output ... */
                    assert(m_info.output_scanline == m_info.output_height);
                    m_state = JPEG_DONE;
                }
            }

            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 == 0) {
                            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 == 0) &&
                                (scan > 1) &&
                                (status != JPEG_REACHED_EOI))
                                scan--;

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

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

                        if (!m_decoder->outputScanlines()) {
                            if (m_info.output_scanline == 0)
                                /* 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 true; /* I/O suspension */
                        }

                        if (m_info.output_scanline == m_info.output_height) {
                            if (!jpeg_finish_output(&m_info))
                                return true; /* 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;
                }
            }

            case JPEG_DONE:
            {
                /* Finish decompression */
                if (!jpeg_finish_decompress(&m_info))
                    return true; /* I/O suspension */

                m_state = JPEG_SINK_NON_JPEG_TRAILER;

                /* we're done */
                break;
            }
            
            case JPEG_SINK_NON_JPEG_TRAILER:
                break;

            case JPEG_ERROR:
                break;
        }

        return true;
    }
Пример #7
0
void
nsJPEGDecoder::WriteInternal(const char *aBuffer, uint32_t aCount)
{
  mSegment = (const JOCTET *)aBuffer;
  mSegmentLen = aCount;

  NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");

  /* Return here if there is a fatal error within libjpeg. */
  nsresult error_code;
  // This cast to nsresult makes sense because setjmp() returns whatever we
  // passed to longjmp(), which was actually an nsresult.
  if ((error_code = (nsresult)setjmp(mErr.setjmp_buffer)) != NS_OK) {
    if (error_code == NS_ERROR_FAILURE) {
      PostDataError();
      /* Error due to corrupt stream - return NS_OK and consume silently
         so that libpr0n doesn't throw away a partial image load */
      mState = JPEG_SINK_NON_JPEG_TRAILER;
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (setjmp returned NS_ERROR_FAILURE)"));
      return;
    } else {
      /* Error due to reasons external to the stream (probably out of
         memory) - let libpr0n attempt to clean up, even though
         mozilla is seconds away from falling flat on its face. */
      PostDecoderError(error_code);
      mState = JPEG_ERROR;
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (setjmp returned an error)"));
      return;
    }
  }

  PR_LOG(gJPEGlog, PR_LOG_DEBUG,
         ("[this=%p] nsJPEGDecoder::Write -- processing JPEG data\n", this));

  switch (mState) {
  case JPEG_HEADER:
  {
    LOG_SCOPE(gJPEGlog, "nsJPEGDecoder::Write -- entering JPEG_HEADER case");

    /* Step 3: read file parameters with jpeg_read_header() */
    if (jpeg_read_header(&mInfo, TRUE) == JPEG_SUSPENDED) {
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (JPEG_SUSPENDED)"));
      return; /* I/O suspension */
    }

    // Post our size to the superclass
    PostSize(mInfo.image_width, mInfo.image_height);
    if (HasError()) {
      // Setting the size led to an error.
      mState = JPEG_ERROR;
      return;
    }

    /* If we're doing a size decode, we're done. */
    if (IsSizeDecode())
      return;

    /* We're doing a full decode. */
    if (mCMSMode != eCMSMode_Off &&
        (mInProfile = GetICCProfile(mInfo)) != nullptr) {
      uint32_t profileSpace = qcms_profile_get_color_space(mInProfile);
      bool mismatch = false;

#ifdef DEBUG_tor
      fprintf(stderr, "JPEG profileSpace: 0x%08X\n", profileSpace);
#endif
      switch (mInfo.jpeg_color_space) {
      case JCS_GRAYSCALE:
        if (profileSpace == icSigRgbData)
          mInfo.out_color_space = JCS_RGB;
        else if (profileSpace != icSigGrayData)
          mismatch = true;
        break;
      case JCS_RGB:
        if (profileSpace != icSigRgbData)
          mismatch =  true;
        break;
      case JCS_YCbCr:
        if (profileSpace == icSigRgbData)
          mInfo.out_color_space = JCS_RGB;
        else
	  // qcms doesn't support ycbcr
          mismatch = true;
        break;
      case JCS_CMYK:
      case JCS_YCCK:
	  // qcms doesn't support cmyk
          mismatch = true;
        break;
      default:
        mState = JPEG_ERROR;
        PostDataError();
        PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
               ("} (unknown colorpsace (1))"));
        return;
      }

      if (!mismatch) {
        qcms_data_type type;
        switch (mInfo.out_color_space) {
        case JCS_GRAYSCALE:
          type = QCMS_DATA_GRAY_8;
          break;
        case JCS_RGB:
          type = QCMS_DATA_RGB_8;
          break;
        default:
          mState = JPEG_ERROR;
          PostDataError();
          PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
                 ("} (unknown colorpsace (2))"));
          return;
        }
#if 0
        /* We don't currently support CMYK profiles. The following
         * code dealt with lcms types. Add something like this
         * back when we gain support for CMYK.
         */
        /* Adobe Photoshop writes YCCK/CMYK files with inverted data */
        if (mInfo.out_color_space == JCS_CMYK)
          type |= FLAVOR_SH(mInfo.saw_Adobe_marker ? 1 : 0);
#endif

        if (gfxPlatform::GetCMSOutputProfile()) {

          /* Calculate rendering intent. */
          int intent = gfxPlatform::GetRenderingIntent();
          if (intent == -1)
              intent = qcms_profile_get_rendering_intent(mInProfile);

          /* Create the color management transform. */
          mTransform = qcms_transform_create(mInProfile,
                                          type,
                                          gfxPlatform::GetCMSOutputProfile(),
                                          QCMS_DATA_RGB_8,
                                          (qcms_intent)intent);
        }
      } else {
#ifdef DEBUG_tor
        fprintf(stderr, "ICM profile colorspace mismatch\n");
#endif
      }
    }

    if (!mTransform) {
      switch (mInfo.jpeg_color_space) {
      case JCS_GRAYSCALE:
      case JCS_RGB:
      case JCS_YCbCr:
        mInfo.out_color_space = JCS_RGB;
        break;
      case JCS_CMYK:
      case JCS_YCCK:
        /* libjpeg can convert from YCCK to CMYK, but not to RGB */
        mInfo.out_color_space = JCS_CMYK;
        break;
      default:
        mState = JPEG_ERROR;
        PostDataError();
        PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
               ("} (unknown colorpsace (3))"));
        return;
        break;
      }
    }

    /*
     * Don't allocate a giant and superfluous memory buffer
     * when the image is a sequential JPEG.
     */
    mInfo.buffered_image = jpeg_has_multiple_scans(&mInfo);

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

    uint32_t imagelength;
    if (NS_FAILED(mImage.EnsureFrame(0, 0, 0, mInfo.image_width, mInfo.image_height,
                                     gfxASurface::ImageFormatRGB24,
                                     &mImageData, &imagelength))) {
      mState = JPEG_ERROR;
      PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (could not initialize image frame)"));
      return;
    }

    PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
           ("        JPEGDecoderAccounting: nsJPEGDecoder::Write -- created image frame with %ux%u pixels",
            mInfo.image_width, mInfo.image_height));

    // Tell the superclass we're starting a frame
    PostFrameStart();

    mState = JPEG_START_DECOMPRESS;
  }

  case JPEG_START_DECOMPRESS:
  {
    LOG_SCOPE(gJPEGlog, "nsJPEGDecoder::Write -- entering JPEG_START_DECOMPRESS case");
    /* Step 4: set parameters for decompression */

    /* FIXME -- Should reset dct_method and dither mode
     * for final pass of progressive JPEG
     */
    mInfo.dct_method =  JDCT_ISLOW;
    mInfo.dither_mode = JDITHER_FS;
    mInfo.do_fancy_upsampling = TRUE;
    mInfo.enable_2pass_quant = FALSE;
    mInfo.do_block_smoothing = TRUE;

    /* Step 5: Start decompressor */
    if (jpeg_start_decompress(&mInfo) == FALSE) {
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (I/O suspension after jpeg_start_decompress())"));
      return; /* I/O suspension */
    }

    /* Force to use our YCbCr to Packed RGB converter when possible */
    if (!mTransform && (mCMSMode != eCMSMode_All) &&
        mInfo.jpeg_color_space == JCS_YCbCr && mInfo.out_color_space == JCS_RGB) {
      /* Special case for the most common case: transform from YCbCr direct into packed ARGB */
      mInfo.out_color_components = 4; /* Packed ARGB pixels are always 4 bytes...*/
      mInfo.cconvert->color_convert = ycc_rgb_convert_argb;
    }

    /* If this is a progressive JPEG ... */
    mState = mInfo.buffered_image ? JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL;
  }

  case JPEG_DECOMPRESS_SEQUENTIAL:
  {
    if (mState == JPEG_DECOMPRESS_SEQUENTIAL)
    {
      LOG_SCOPE(gJPEGlog, "nsJPEGDecoder::Write -- JPEG_DECOMPRESS_SEQUENTIAL case");
      
      bool suspend;
      OutputScanlines(&suspend);
      
      if (suspend) {
        PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
               ("} (I/O suspension after OutputScanlines() - SEQUENTIAL)"));
        return; /* I/O suspension */
      }
      
      /* If we've completed image output ... */
      NS_ASSERTION(mInfo.output_scanline == mInfo.output_height, "We didn't process all of the data!");
      mState = JPEG_DONE;
    }
  }

  case JPEG_DECOMPRESS_PROGRESSIVE:
  {
    if (mState == JPEG_DECOMPRESS_PROGRESSIVE)
    {
      LOG_SCOPE(gJPEGlog, "nsJPEGDecoder::Write -- JPEG_DECOMPRESS_PROGRESSIVE case");

      int status;
      do {
        status = jpeg_consume_input(&mInfo);
      } while ((status != JPEG_SUSPENDED) &&
               (status != JPEG_REACHED_EOI));

      for (;;) {
        if (mInfo.output_scanline == 0) {
          int scan = mInfo.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 ((mInfo.output_scan_number == 0) &&
              (scan > 1) &&
              (status != JPEG_REACHED_EOI))
            scan--;

          if (!jpeg_start_output(&mInfo, scan)) {
            PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
                   ("} (I/O suspension after jpeg_start_output() - PROGRESSIVE)"));
            return; /* I/O suspension */
          }
        }

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

        bool suspend;
        OutputScanlines(&suspend);

        if (suspend) {
          if (mInfo.output_scanline == 0) {
            /* didn't manage to read any lines - flag so we don't call
               jpeg_start_output() multiple times for the same scan */
            mInfo.output_scanline = 0xffffff;
          }
          PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
                 ("} (I/O suspension after OutputScanlines() - PROGRESSIVE)"));
          return; /* I/O suspension */
        }

        if (mInfo.output_scanline == mInfo.output_height)
        {
          if (!jpeg_finish_output(&mInfo)) {
            PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
                   ("} (I/O suspension after jpeg_finish_output() - PROGRESSIVE)"));
            return; /* I/O suspension */
          }

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

          mInfo.output_scanline = 0;
        }
      }

      mState = JPEG_DONE;
    }
  }

  case JPEG_DONE:
  {
    LOG_SCOPE(gJPEGlog, "nsJPEGDecoder::ProcessData -- entering JPEG_DONE case");

    /* Step 7: Finish decompression */

    if (jpeg_finish_decompress(&mInfo) == FALSE) {
      PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
             ("} (I/O suspension after jpeg_finish_decompress() - DONE)"));
      return; /* I/O suspension */
    }

    mState = JPEG_SINK_NON_JPEG_TRAILER;

    /* we're done dude */
    break;
  }
  case JPEG_SINK_NON_JPEG_TRAILER:
    PR_LOG(gJPEGlog, PR_LOG_DEBUG,
           ("[this=%p] nsJPEGDecoder::ProcessData -- entering JPEG_SINK_NON_JPEG_TRAILER case\n", this));

    break;

  case JPEG_ERROR:
    NS_ABORT_IF_FALSE(0, "Should always return immediately after error and not re-enter decoder");
  }

  PR_LOG(gJPEGDecoderAccountingLog, PR_LOG_DEBUG,
         ("} (end of function)"));
  return;
}