[WIP] Move ImageDecoders to SkCodec

third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
deleted file mode 100644
index 2fdf29e19ba2dbd5df6681985877f3ed1050d320..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
+++ /dev/null
@@ -1,525 +0,0 @@
-/*
- * Copyright (C) 2010 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "platform/image-decoders/webp/WEBPImageDecoder.h"
-
-#if CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN)
-#error Blink assumes a little-endian target.
-#endif
-
-#if SK_B32_SHIFT  // Output little-endian RGBA pixels (Android).
-inline WEBP_CSP_MODE outputMode(bool hasAlpha) {
-  return hasAlpha ? MODE_rgbA : MODE_RGBA;
-}
-#else  // Output little-endian BGRA pixels.
-inline WEBP_CSP_MODE outputMode(bool hasAlpha) {
-  return hasAlpha ? MODE_bgrA : MODE_BGRA;
-}
-#endif
-
-namespace {
-
-// Returns two point ranges (<left, width> pairs) at row |canvasY| which belong
-// to |src| but not |dst|. A range is empty if its width is 0.
-inline void findBlendRangeAtRow(const blink::IntRect& src,
-                                const blink::IntRect& dst,
-                                int canvasY,
-                                int& left1,
-                                int& width1,
-                                int& left2,
-                                int& width2) {
-  SECURITY_DCHECK(canvasY >= src.Y() && canvasY < src.MaxY());
-  left1 = -1;
-  width1 = 0;
-  left2 = -1;
-  width2 = 0;
-
-  if (canvasY < dst.Y() || canvasY >= dst.MaxY() || src.X() >= dst.MaxX() ||
-      src.MaxX() <= dst.X()) {
-    left1 = src.X();
-    width1 = src.Width();
-    return;
-  }
-
-  if (src.X() < dst.X()) {
-    left1 = src.X();
-    width1 = dst.X() - src.X();
-  }
-
-  if (src.MaxX() > dst.MaxX()) {
-    left2 = dst.MaxX();
-    width2 = src.MaxX() - dst.MaxX();
-  }
-}
-
-// alphaBlendPremultiplied and alphaBlendNonPremultiplied are separate methods,
-// even though they only differ by one line. This is done so that the compiler
-// can inline BlendSrcOverDstPremultiplied() and BlensSrcOverDstRaw() calls.
-// For GIF images, this optimization reduces decoding time by 15% for 3MB
-// images.
-void alphaBlendPremultiplied(blink::ImageFrame& src,
-                             blink::ImageFrame& dst,
-                             int canvasY,
-                             int left,
-                             int width) {
-  for (int x = 0; x < width; ++x) {
-    int canvasX = left + x;
-    blink::ImageFrame::PixelData* pixel = src.GetAddr(canvasX, canvasY);
-    if (SkGetPackedA32(*pixel) != 0xff) {
-      blink::ImageFrame::PixelData prevPixel = *dst.GetAddr(canvasX, canvasY);
-      blink::ImageFrame::BlendSrcOverDstPremultiplied(pixel, prevPixel);
-    }
-  }
-}
-
-void alphaBlendNonPremultiplied(blink::ImageFrame& src,
-                                blink::ImageFrame& dst,
-                                int canvasY,
-                                int left,
-                                int width) {
-  for (int x = 0; x < width; ++x) {
-    int canvasX = left + x;
-    blink::ImageFrame::PixelData* pixel = src.GetAddr(canvasX, canvasY);
-    if (SkGetPackedA32(*pixel) != 0xff) {
-      blink::ImageFrame::PixelData prevPixel = *dst.GetAddr(canvasX, canvasY);
-      blink::ImageFrame::BlendSrcOverDstRaw(pixel, prevPixel);
-    }
-  }
-}
-
-}  // namespace
-
-namespace blink {
-
-WEBPImageDecoder::WEBPImageDecoder(AlphaOption alpha_option,
-                                   const ColorBehavior& color_behavior,
-                                   size_t max_decoded_bytes)
-    : ImageDecoder(alpha_option, color_behavior, max_decoded_bytes),
-      decoder_(0),
-      format_flags_(0),
-      frame_background_has_alpha_(false),
-      demux_(0),
-      demux_state_(WEBP_DEMUX_PARSING_HEADER),
-      have_already_parsed_this_data_(false),
-      repetition_count_(kAnimationLoopOnce),
-      decoded_height_(0) {
-  blend_function_ = (alpha_option == kAlphaPremultiplied)
-                        ? alphaBlendPremultiplied
-                        : alphaBlendNonPremultiplied;
-}
-
-WEBPImageDecoder::~WEBPImageDecoder() {
-  Clear();
-}
-
-void WEBPImageDecoder::Clear() {
-  WebPDemuxDelete(demux_);
-  demux_ = 0;
-  consolidated_data_.reset();
-  ClearDecoder();
-}
-
-void WEBPImageDecoder::ClearDecoder() {
-  WebPIDelete(decoder_);
-  decoder_ = 0;
-  decoded_height_ = 0;
-  frame_background_has_alpha_ = false;
-}
-
-void WEBPImageDecoder::OnSetData(SegmentReader*) {
-  have_already_parsed_this_data_ = false;
-}
-
-int WEBPImageDecoder::RepetitionCount() const {
-  return Failed() ? kAnimationLoopOnce : repetition_count_;
-}
-
-bool WEBPImageDecoder::FrameIsCompleteAtIndex(size_t index) const {
-  if (!demux_ || demux_state_ <= WEBP_DEMUX_PARSING_HEADER)
-    return false;
-  if (!(format_flags_ & ANIMATION_FLAG))
-    return ImageDecoder::FrameIsCompleteAtIndex(index);
-  bool frame_is_received_at_index = index < frame_buffer_cache_.size();
-  return frame_is_received_at_index;
-}
-
-float WEBPImageDecoder::FrameDurationAtIndex(size_t index) const {
-  return index < frame_buffer_cache_.size()
-             ? frame_buffer_cache_[index].Duration()
-             : 0;
-}
-
-bool WEBPImageDecoder::UpdateDemuxer() {
-  if (Failed())
-    return false;
-
-  if (have_already_parsed_this_data_)
-    return true;
-
-  have_already_parsed_this_data_ = true;
-
-  const unsigned kWebpHeaderSize = 30;
-  if (data_->size() < kWebpHeaderSize)
-    return false;  // Await VP8X header so WebPDemuxPartial succeeds.
-
-  WebPDemuxDelete(demux_);
-  consolidated_data_ = data_->GetAsSkData();
-  WebPData input_data = {
-      reinterpret_cast<const uint8_t*>(consolidated_data_->data()),
-      consolidated_data_->size()};
-  demux_ = WebPDemuxPartial(&input_data, &demux_state_);
-  if (!demux_ || (IsAllDataReceived() && demux_state_ != WEBP_DEMUX_DONE)) {
-    if (!demux_)
-      consolidated_data_.reset();
-    return SetFailed();
-  }
-
-  DCHECK_GT(demux_state_, WEBP_DEMUX_PARSING_HEADER);
-  if (!WebPDemuxGetI(demux_, WEBP_FF_FRAME_COUNT))
-    return false;  // Wait until the encoded image frame data arrives.
-
-  if (!IsDecodedSizeAvailable()) {
-    int width = WebPDemuxGetI(demux_, WEBP_FF_CANVAS_WIDTH);
-    int height = WebPDemuxGetI(demux_, WEBP_FF_CANVAS_HEIGHT);
-    if (!SetSize(width, height))
-      return SetFailed();
-
-    format_flags_ = WebPDemuxGetI(demux_, WEBP_FF_FORMAT_FLAGS);
-    if (!(format_flags_ & ANIMATION_FLAG)) {
-      repetition_count_ = kAnimationNone;
-    } else {
-      // Since we have parsed at least one frame, even if partially,
-      // the global animation (ANIM) properties have been read since
-      // an ANIM chunk must precede the ANMF frame chunks.
-      repetition_count_ = WebPDemuxGetI(demux_, WEBP_FF_LOOP_COUNT);
-      // Repetition count is always <= 16 bits.
-      DCHECK_EQ(repetition_count_, repetition_count_ & 0xffff);
-      if (!repetition_count_)
-        repetition_count_ = kAnimationLoopInfinite;
-      // FIXME: Implement ICC profile support for animated images.
-      format_flags_ &= ~ICCP_FLAG;
-    }
-
-    if ((format_flags_ & ICCP_FLAG) && !IgnoresColorSpace())
-      ReadColorProfile();
-  }
-
-  DCHECK(IsDecodedSizeAvailable());
-
-  size_t frame_count = WebPDemuxGetI(demux_, WEBP_FF_FRAME_COUNT);
-  UpdateAggressivePurging(frame_count);
-
-  return true;
-}
-
-void WEBPImageDecoder::OnInitFrameBuffer(size_t frame_index) {
-  // ImageDecoder::InitFrameBuffer does a DCHECK if |frame_index| exists.
-  ImageFrame& buffer = frame_buffer_cache_[frame_index];
-
-  const size_t required_previous_frame_index =
-      buffer.RequiredPreviousFrameIndex();
-  if (required_previous_frame_index == kNotFound) {
-    frame_background_has_alpha_ =
-        !buffer.OriginalFrameRect().Contains(IntRect(IntPoint(), Size()));
-  } else {
-    const ImageFrame& prev_buffer =
-        frame_buffer_cache_[required_previous_frame_index];
-    frame_background_has_alpha_ =
-        prev_buffer.HasAlpha() || (prev_buffer.GetDisposalMethod() ==
-                                   ImageFrame::kDisposeOverwriteBgcolor);
-  }
-
-  // The buffer is transparent outside the decoded area while the image is
-  // loading. The correct alpha value for the frame will be set when it is fully
-  // decoded.
-  buffer.SetHasAlpha(true);
-}
-
-bool WEBPImageDecoder::CanReusePreviousFrameBuffer(size_t frame_index) const {
-  DCHECK(frame_index < frame_buffer_cache_.size());
-  return frame_buffer_cache_[frame_index].GetAlphaBlendSource() !=
-         ImageFrame::kBlendAtopPreviousFrame;
-}
-
-void WEBPImageDecoder::ClearFrameBuffer(size_t frame_index) {
-  if (demux_ && demux_state_ >= WEBP_DEMUX_PARSED_HEADER &&
-      frame_buffer_cache_[frame_index].GetStatus() ==
-          ImageFrame::kFramePartial) {
-    // Clear the decoder state so that this partial frame can be decoded again
-    // when requested.
-    ClearDecoder();
-  }
-  ImageDecoder::ClearFrameBuffer(frame_index);
-}
-
-void WEBPImageDecoder::ReadColorProfile() {
-  WebPChunkIterator chunk_iterator;
-  if (!WebPDemuxGetChunk(demux_, "ICCP", 1, &chunk_iterator)) {
-    WebPDemuxReleaseChunkIterator(&chunk_iterator);
-    return;
-  }
-
-  const char* profile_data =
-      reinterpret_cast<const char*>(chunk_iterator.chunk.bytes);
-  size_t profile_size = chunk_iterator.chunk.size;
-
-  SetEmbeddedColorProfile(profile_data, profile_size);
-
-  WebPDemuxReleaseChunkIterator(&chunk_iterator);
-}
-
-void WEBPImageDecoder::ApplyPostProcessing(size_t frame_index) {
-  ImageFrame& buffer = frame_buffer_cache_[frame_index];
-  int width;
-  int decoded_height;
-  if (!WebPIDecGetRGB(decoder_, &decoded_height, &width, 0, 0))
-    return;  // See also https://bugs.webkit.org/show_bug.cgi?id=74062
-  if (decoded_height <= 0)
-    return;
-
-  const IntRect& frame_rect = buffer.OriginalFrameRect();
-  SECURITY_DCHECK(width == frame_rect.Width());
-  SECURITY_DCHECK(decoded_height <= frame_rect.Height());
-  const int left = frame_rect.X();
-  const int top = frame_rect.Y();
-
-  // TODO (msarett):
-  // Here we apply the color space transformation to the dst space.
-  // It does not really make sense to transform to a gamma-encoded
-  // space and then immediately after, perform a linear premultiply
-  // and linear blending.  Can we find a way to perform the
-  // premultiplication and blending in a linear space?
-  SkColorSpaceXform* xform = ColorTransform();
-  if (xform) {
-    const SkColorSpaceXform::ColorFormat kSrcFormat =
-        SkColorSpaceXform::kBGRA_8888_ColorFormat;
-    const SkColorSpaceXform::ColorFormat kDstFormat =
-        SkColorSpaceXform::kRGBA_8888_ColorFormat;
-    for (int y = decoded_height_; y < decoded_height; ++y) {
-      const int canvas_y = top + y;
-      uint8_t* row = reinterpret_cast<uint8_t*>(buffer.GetAddr(left, canvas_y));
-      xform->apply(kDstFormat, row, kSrcFormat, row, width,
-                   kUnpremul_SkAlphaType);
-
-      uint8_t* pixel = row;
-      for (int x = 0; x < width; ++x, pixel += 4) {
-        const int canvas_x = left + x;
-        buffer.SetRGBA(canvas_x, canvas_y, pixel[0], pixel[1], pixel[2],
-                       pixel[3]);
-      }
-    }
-  }
-
-  // During the decoding of the current frame, we may have set some pixels to be
-  // transparent (i.e. alpha < 255). If the alpha blend source was
-  // 'BlendAtopPreviousFrame', the values of these pixels should be determined
-  // by blending them against the pixels of the corresponding previous frame.
-  // Compute the correct opaque values now.
-  // FIXME: This could be avoided if libwebp decoder had an API that used the
-  // previous required frame to do the alpha-blending by itself.
-  if ((format_flags_ & ANIMATION_FLAG) && frame_index &&
-      buffer.GetAlphaBlendSource() == ImageFrame::kBlendAtopPreviousFrame &&
-      buffer.RequiredPreviousFrameIndex() != kNotFound) {
-    ImageFrame& prev_buffer = frame_buffer_cache_[frame_index - 1];
-    DCHECK_EQ(prev_buffer.GetStatus(), ImageFrame::kFrameComplete);
-    ImageFrame::DisposalMethod prev_disposal_method =
-        prev_buffer.GetDisposalMethod();
-    if (prev_disposal_method == ImageFrame::kDisposeKeep) {
-      // Blend transparent pixels with pixels in previous canvas.
-      for (int y = decoded_height_; y < decoded_height; ++y) {
-        blend_function_(buffer, prev_buffer, top + y, left, width);
-      }
-    } else if (prev_disposal_method == ImageFrame::kDisposeOverwriteBgcolor) {
-      const IntRect& prev_rect = prev_buffer.OriginalFrameRect();
-      // We need to blend a transparent pixel with the starting value (from just
-      // after the InitFrame() call). If the pixel belongs to prev_rect, the
-      // starting value was fully transparent, so this is a no-op. Otherwise, we
-      // need to blend against the pixel from the previous canvas.
-      for (int y = decoded_height_; y < decoded_height; ++y) {
-        int canvas_y = top + y;
-        int left1, width1, left2, width2;
-        findBlendRangeAtRow(frame_rect, prev_rect, canvas_y, left1, width1,
-                            left2, width2);
-        if (width1 > 0)
-          blend_function_(buffer, prev_buffer, canvas_y, left1, width1);
-        if (width2 > 0)
-          blend_function_(buffer, prev_buffer, canvas_y, left2, width2);
-      }
-    }
-  }
-
-  decoded_height_ = decoded_height;
-  buffer.SetPixelsChanged(true);
-}
-
-size_t WEBPImageDecoder::DecodeFrameCount() {
-  // If UpdateDemuxer() fails, return the existing number of frames.  This way
-  // if we get halfway through the image before decoding fails, we won't
-  // suddenly start reporting that the image has zero frames.
-  return UpdateDemuxer() ? WebPDemuxGetI(demux_, WEBP_FF_FRAME_COUNT)
-                         : frame_buffer_cache_.size();
-}
-
-void WEBPImageDecoder::InitializeNewFrame(size_t index) {
-  if (!(format_flags_ & ANIMATION_FLAG)) {
-    DCHECK(!index);
-    return;
-  }
-  WebPIterator animated_frame;
-  WebPDemuxGetFrame(demux_, index + 1, &animated_frame);
-  DCHECK_EQ(animated_frame.complete, 1);
-  ImageFrame* buffer = &frame_buffer_cache_[index];
-  IntRect frame_rect(animated_frame.x_offset, animated_frame.y_offset,
-                     animated_frame.width, animated_frame.height);
-  buffer->SetOriginalFrameRect(
-      Intersection(frame_rect, IntRect(IntPoint(), Size())));
-  buffer->SetDuration(animated_frame.duration);
-  buffer->SetDisposalMethod(animated_frame.dispose_method ==
-                                    WEBP_MUX_DISPOSE_BACKGROUND
-                                ? ImageFrame::kDisposeOverwriteBgcolor
-                                : ImageFrame::kDisposeKeep);
-  buffer->SetAlphaBlendSource(animated_frame.blend_method == WEBP_MUX_BLEND
-                                  ? ImageFrame::kBlendAtopPreviousFrame
-                                  : ImageFrame::kBlendAtopBgcolor);
-  buffer->SetRequiredPreviousFrameIndex(
-      FindRequiredPreviousFrame(index, !animated_frame.has_alpha));
-  WebPDemuxReleaseIterator(&animated_frame);
-}
-
-void WEBPImageDecoder::Decode(size_t index) {
-  if (Failed())
-    return;
-
-  Vector<size_t> frames_to_decode = FindFramesToDecode(index);
-
-  DCHECK(demux_);
-  for (auto i = frames_to_decode.rbegin(); i != frames_to_decode.rend(); ++i) {
-    if ((format_flags_ & ANIMATION_FLAG) && !InitFrameBuffer(*i)) {
-      SetFailed();
-      return;
-    }
-
-    WebPIterator webp_frame;
-    if (!WebPDemuxGetFrame(demux_, *i + 1, &webp_frame)) {
-      SetFailed();
-    } else {
-      DecodeSingleFrame(webp_frame.fragment.bytes, webp_frame.fragment.size,
-                        *i);
-      WebPDemuxReleaseIterator(&webp_frame);
-    }
-    if (Failed())
-      return;
-
-    // If this returns false, we need more data to continue decoding.
-    if (!PostDecodeProcessing(*i))
-      break;
-  }
-
-  // It is also a fatal error if all data is received and we have decoded all
-  // frames available but the file is truncated.
-  if (index >= frame_buffer_cache_.size() - 1 && IsAllDataReceived() &&
-      demux_ && demux_state_ != WEBP_DEMUX_DONE)
-    SetFailed();
-}
-
-bool WEBPImageDecoder::DecodeSingleFrame(const uint8_t* data_bytes,
-                                         size_t data_size,
-                                         size_t frame_index) {
-  if (Failed())
-    return false;
-
-  DCHECK(IsDecodedSizeAvailable());
-
-  DCHECK_GT(frame_buffer_cache_.size(), frame_index);
-  ImageFrame& buffer = frame_buffer_cache_[frame_index];
-  DCHECK_NE(buffer.GetStatus(), ImageFrame::kFrameComplete);
-
-  if (buffer.GetStatus() == ImageFrame::kFrameEmpty) {
-    if (!buffer.AllocatePixelData(Size().Width(), Size().Height(),
-                                  ColorSpaceForSkImages()))
-      return SetFailed();
-    buffer.ZeroFillPixelData();
-    buffer.SetStatus(ImageFrame::kFramePartial);
-    // The buffer is transparent outside the decoded area while the image is
-    // loading. The correct alpha value for the frame will be set when it is
-    // fully decoded.
-    buffer.SetHasAlpha(true);
-    buffer.SetOriginalFrameRect(IntRect(IntPoint(), Size()));
-  }
-
-  const IntRect& frame_rect = buffer.OriginalFrameRect();
-  if (!decoder_) {
-    WEBP_CSP_MODE mode = outputMode(format_flags_ & ALPHA_FLAG);
-    if (!premultiply_alpha_)
-      mode = outputMode(false);
-    if (ColorTransform()) {
-      // Swizzling between RGBA and BGRA is zero cost in a color transform.
-      // So when we have a color transform, we should decode to whatever is
-      // easiest for libwebp, and then let the color transform swizzle if
-      // necessary.
-      // Lossy webp is encoded as YUV (so RGBA and BGRA are the same cost).
-      // Lossless webp is encoded as BGRA. This means decoding to BGRA is
-      // either faster or the same cost as RGBA.
-      mode = MODE_BGRA;
-    }
-    WebPInitDecBuffer(&decoder_buffer_);
-    decoder_buffer_.colorspace = mode;
-    decoder_buffer_.u.RGBA.stride =
-        Size().Width() * sizeof(ImageFrame::PixelData);
-    decoder_buffer_.u.RGBA.size =
-        decoder_buffer_.u.RGBA.stride * frame_rect.Height();
-    decoder_buffer_.is_external_memory = 1;
-    decoder_ = WebPINewDecoder(&decoder_buffer_);
-    if (!decoder_)
-      return SetFailed();
-  }
-
-  decoder_buffer_.u.RGBA.rgba = reinterpret_cast<uint8_t*>(
-      buffer.GetAddr(frame_rect.X(), frame_rect.Y()));
-
-  switch (WebPIUpdate(decoder_, data_bytes, data_size)) {
-    case VP8_STATUS_OK:
-      ApplyPostProcessing(frame_index);
-      buffer.SetHasAlpha((format_flags_ & ALPHA_FLAG) ||
-                         frame_background_has_alpha_);
-      buffer.SetStatus(ImageFrame::kFrameComplete);
-      ClearDecoder();
-      return true;
-    case VP8_STATUS_SUSPENDED:
-      if (!IsAllDataReceived() && !FrameIsCompleteAtIndex(frame_index)) {
-        ApplyPostProcessing(frame_index);
-        return false;
-      }
-    // FALLTHROUGH
-    default:
-      Clear();
-      return SetFailed();
-  }
-}
-
-}  // namespace blink