1 files changed, 103 insertions, 0 deletions
diff --git a/image/SurfacePipe.cpp b/image/SurfacePipe.cpp
new file mode 100644
index 0000000000..1fbb25470d
--- /dev/null
+++ b/image/SurfacePipe.cpp
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SurfacePipe.h"
+
+#include <algorithm>  // for min
+
+#include "Decoder.h"
+
+namespace mozilla {
+namespace image {
+
+using namespace gfx;
+
+using std::min;
+
+Maybe<SurfaceInvalidRect> AbstractSurfaceSink::TakeInvalidRect() {
+  if (mInvalidRect.IsEmpty()) {
+    return Nothing();
+  }
+
+  SurfaceInvalidRect invalidRect;
+  invalidRect.mInputSpaceRect = invalidRect.mOutputSpaceRect = mInvalidRect;
+
+  // Forget about the invalid rect we're returning.
+  mInvalidRect = IntRect();
+
+  return Some(invalidRect);
+}
+
+uint8_t* AbstractSurfaceSink::DoResetToFirstRow() {
+  mRow = 0;
+  return GetRowPointer();
+}
+
+uint8_t* AbstractSurfaceSink::DoAdvanceRowFromBuffer(const uint8_t* aInputRow) {
+  CopyInputRow(aInputRow);
+  return DoAdvanceRow();
+}
+
+uint8_t* AbstractSurfaceSink::DoAdvanceRow() {
+  if (mRow >= uint32_t(InputSize().height)) {
+    return nullptr;
+  }
+
+  // If we're vertically flipping the output, we need to flip the invalid rect.
+  // Since we're dealing with an axis-aligned rect, only the y coordinate needs
+  // to change.
+  int32_t invalidY = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
+  mInvalidRect.UnionRect(mInvalidRect,
+                         IntRect(0, invalidY, InputSize().width, 1));
+
+  mRow = min(uint32_t(InputSize().height), mRow + 1);
+
+  return mRow < uint32_t(InputSize().height) ? GetRowPointer() : nullptr;
+}
+
+nsresult SurfaceSink::Configure(const SurfaceConfig& aConfig) {
+  IntSize surfaceSize = aConfig.mOutputSize;
+
+  // Allocate the frame.
+  // XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
+  // to allocate the frame directly here and get rid of Decoder::AllocateFrame
+  // altogether.
+  nsresult rv = aConfig.mDecoder->AllocateFrame(surfaceSize, aConfig.mFormat,
+                                                aConfig.mAnimParams);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  mImageData = aConfig.mDecoder->mImageData;
+  mImageDataLength = aConfig.mDecoder->mImageDataLength;
+  mFlipVertically = aConfig.mFlipVertically;
+
+  MOZ_ASSERT(mImageData);
+  MOZ_ASSERT(uint64_t(mImageDataLength) == uint64_t(surfaceSize.width) *
+                                               uint64_t(surfaceSize.height) *
+                                               sizeof(uint32_t));
+
+  ConfigureFilter(surfaceSize, sizeof(uint32_t));
+  return NS_OK;
+}
+
+uint8_t* SurfaceSink::GetRowPointer() const {
+  // If we're flipping vertically, reverse the order in which we traverse the
+  // rows.
+  uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
+
+  uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint32_t);
+
+  MOZ_ASSERT(rowPtr >= mImageData);
+  MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
+  MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint32_t) <=
+             mImageData + mImageDataLength);
+
+  return rowPtr;
+}
+
+}  // namespace image
+}  // namespace mozilla