Index: remoting/base/decoder_row_based.cc |
diff --git a/remoting/base/decoder_row_based.cc b/remoting/base/decoder_row_based.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..2f4290a8c8aab6b585731e28c12ec05735021481 |
--- /dev/null |
+++ b/remoting/base/decoder_row_based.cc |
@@ -0,0 +1,117 @@ |
+// Copyright (c) 2010 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "remoting/base/decoder_row_based.h" |
+ |
+#include "remoting/base/decompressor.h" |
+#include "remoting/base/decompressor_zlib.h" |
+#include "remoting/base/decompressor_verbatim.h" |
+#include "remoting/base/protocol_util.h" |
+ |
+namespace remoting { |
+ |
+DecoderRowBased* DecoderRowBased::CreateZlibDecoder() { |
+ return new DecoderRowBased(new DecompressorZlib(), EncodingZlib); |
+} |
+ |
+DecoderRowBased* DecoderRowBased::CreateVerbatimDecoder() { |
+ return new DecoderRowBased(new DecompressorVerbatim(), EncodingNone); |
+} |
+ |
+DecoderRowBased::DecoderRowBased(Decompressor* decompressor, |
+ UpdateStreamEncoding encoding) |
+ : state_(kUninitialized), |
+ decompressor_(decompressor), |
+ encoding_(encoding), |
+ bytes_per_src_pixel_(0), |
+ row_pos_(0), |
+ row_y_(0), |
+ // TODO(hclam): We should use the information from the update stream |
+ // to determine whether we should reverse the rows or not. |
+ // But for simplicity we set to be always true. |
+ reverse_rows_(true) { |
+} |
+ |
+DecoderRowBased::~DecoderRowBased() { |
+} |
+ |
+void DecoderRowBased::Reset() { |
+ frame_ = NULL; |
+ decompressor_->Reset(); |
+ state_ = kUninitialized; |
+} |
+ |
+bool DecoderRowBased::IsReadyForData() { |
+ return state_ == kReady; |
+} |
+ |
+void DecoderRowBased::Initialize(scoped_refptr<media::VideoFrame> frame, |
+ const gfx::Rect& clip, |
+ int bytes_per_src_pixel) { |
+ // Make sure we are not currently initialized. |
+ CHECK_EQ(kUninitialized, state_); |
+ |
+ if (static_cast<PixelFormat>(frame->format()) != PixelFormatRgb32) { |
+ LOG(WARNING) << "DecoderRowBased only supports RGB32."; |
+ state_ = kError; |
+ return; |
+ } |
+ |
+ frame_ = frame; |
+ |
+ // Reset the buffer location status variables. |
+ clip_ = clip; |
+ row_pos_ = 0; |
+ row_y_ = 0; |
+ bytes_per_src_pixel_ = bytes_per_src_pixel; |
+ |
+ state_ = kReady; |
+} |
+ |
+void DecoderRowBased::DecodeBytes(const std::string& encoded_bytes) { |
+ DCHECK_EQ(kReady, state_); |
+ |
+ const uint8* in = reinterpret_cast<const uint8*>(encoded_bytes.data()); |
+ const int in_size = encoded_bytes.size(); |
+ const int row_size = clip_.width() * bytes_per_src_pixel_; |
+ int stride = frame_->stride(media::VideoFrame::kRGBPlane); |
+ uint8* rect_begin = frame_->data(media::VideoFrame::kRGBPlane); |
+ |
+ if (reverse_rows_) { |
+ // Advance the pointer to the last row. |
+ rect_begin += (frame_->height() - 1) * stride; |
+ |
+ // And then make the stride negative. |
+ stride = -stride; |
+ } |
+ |
+ // TODO(ajwong): This should be bytes_per_dst_pixel shouldn't this.? |
+ uint8* out = rect_begin + |
+ stride * (clip_.y() + row_y_) + |
+ bytes_per_src_pixel_ * clip_.x(); |
+ |
+ // Consume all the data in the message. |
+ bool decompress_again = true; |
+ int used = 0; |
+ while (decompress_again && used < in_size) { |
+ int written = 0; |
+ int consumed = 0; |
+ // TODO(ajwong): This assume source and dest stride are the same, which is |
+ // incorrect. |
+ decompress_again = decompressor_->Process( |
+ in + used, in_size - used, out + row_pos_, row_size - row_pos_, |
+ &consumed, &written); |
+ used += consumed; |
+ row_pos_ += written; |
+ |
+ // If this row is completely filled then move onto the next row. |
+ if (row_pos_ == row_size) { |
+ ++row_y_; |
+ row_pos_ = 0; |
+ out += stride; |
+ } |
+ } |
+} |
+ |
+} // namespace remoting |