C++ (Cpp) DownscaleInputLine示例

示例#1

文件： Downscaler.cpp 项目： Belxjander/tenfourfox

void
Downscaler::CommitRow()
{
  MOZ_ASSERT(mOutputBuffer, "Should have a current frame");
  MOZ_ASSERT(mCurrentInLine < mOriginalSize.height, "Past end of input");
  MOZ_ASSERT(mCurrentOutLine < mTargetSize.height, "Past end of output");

  int32_t filterOffset = 0;
  int32_t filterLength = 0;
  mYFilter->FilterForValue(mCurrentOutLine, &filterOffset, &filterLength);

  int32_t inLineToRead = filterOffset + mLinesInBuffer;
  MOZ_ASSERT(mCurrentInLine <= inLineToRead, "Reading past end of input");
  if (mCurrentInLine == inLineToRead) {
    skia::ConvolveHorizontally(mRowBuffer.get(), *mXFilter,
                               mWindow[mLinesInBuffer++], mHasAlpha,
                               /* use_sse2 = */ true);
  }

  while (mLinesInBuffer == filterLength &&
         mCurrentOutLine < mTargetSize.height) {
    DownscaleInputLine();
    mYFilter->FilterForValue(mCurrentOutLine, &filterOffset, &filterLength);
  }

  mCurrentInLine += 1;
}

示例#2

文件： Downscaler.cpp 项目： carriercomm/system-addons

void
Downscaler::CommitRow()
{
  MOZ_ASSERT(mOutputBuffer, "Should have a current frame");
  MOZ_ASSERT(mCurrentInLine < mOriginalSize.height, "Past end of input");
  MOZ_ASSERT(mCurrentOutLine < mTargetSize.height, "Past end of output");

  int32_t filterOffset = 0;
  int32_t filterLength = 0;
  GetFilterOffsetAndLength(mYFilter, mCurrentOutLine,
                           &filterOffset, &filterLength);

  int32_t inLineToRead = filterOffset + mLinesInBuffer;
  MOZ_ASSERT(mCurrentInLine <= inLineToRead, "Reading past end of input");
  if (mCurrentInLine == inLineToRead) {
    skia::ConvolveHorizontally(mRowBuffer.get(), *mXFilter,
                               mWindow[mLinesInBuffer++], mHasAlpha,
                               supports_sse2());
  }

  MOZ_ASSERT(mCurrentOutLine < mTargetSize.height,
             "Writing past end of output");

  while (mLinesInBuffer == filterLength) {
    DownscaleInputLine();

    if (mCurrentOutLine == mTargetSize.height) {
      break;  // We're done.
    }

    GetFilterOffsetAndLength(mYFilter, mCurrentOutLine,
                             &filterOffset, &filterLength);
  }

  mCurrentInLine += 1;

  // If we're at the end of the part of the original image that has data, commit
  // rows to shift us to the end.
  if (mCurrentInLine == (mFrameRect.y + mFrameRect.height)) {
    SkipToRow(mOriginalSize.height - 1);
  }
}