bool JPEGImageEncoder::encodeWithPreInitializedState(PassOwnPtr<JPEGImageEncoderState> encoderState, const unsigned char* inputPixels)
{
JPEGImageEncoderStateImpl* encoderStateImpl = static_cast<JPEGImageEncoderStateImpl*>(encoderState.get());
Vector<JSAMPLE> row;
row.resize(encoderStateImpl->cinfo()->image_width * encoderStateImpl->cinfo()->input_components);
jmp_buf jumpBuffer;
encoderStateImpl->cinfo()->client_data = &jumpBuffer;
if (setjmp(jumpBuffer)) {
return false;
}
unsigned char* pixels = const_cast<unsigned char*>(inputPixels);
const size_t pixelRowStride = encoderStateImpl->cinfo()->image_width * 4;
while (encoderStateImpl->cinfo()->next_scanline < encoderStateImpl->cinfo()->image_height) {
JSAMPLE* rowData = row.data();
RGBAtoRGB(pixels, encoderStateImpl->cinfo()->image_width, rowData);
jpeg_write_scanlines(encoderStateImpl->cinfo(), &rowData, 1);
pixels += pixelRowStride;
}
jpeg_finish_compress(encoderStateImpl->cinfo());
return true;
}
bool JPEGImageEncoder::encodeWithPreInitializedState(std::unique_ptr<JPEGImageEncoderState> encoderState, const unsigned char* inputPixels, int numRowsCompleted)
{
JPEGImageEncoderStateImpl* encoderStateImpl = static_cast<JPEGImageEncoderStateImpl*>(encoderState.get());
Vector<JSAMPLE> row;
row.resize(encoderStateImpl->cinfo()->image_width * encoderStateImpl->cinfo()->input_components);
SET_JUMP_BUFFER(encoderStateImpl->cinfo(), false);
const size_t pixelRowStride = encoderStateImpl->cinfo()->image_width * 4;
unsigned char* pixels = const_cast<unsigned char*>(inputPixels) + pixelRowStride * numRowsCompleted;
while (encoderStateImpl->cinfo()->next_scanline < encoderStateImpl->cinfo()->image_height) {
JSAMPLE* rowData = row.data();
RGBAtoRGB(pixels, encoderStateImpl->cinfo()->image_width, rowData);
jpeg_write_scanlines(encoderStateImpl->cinfo(), &rowData, 1);
pixels += pixelRowStride;
}
jpeg_finish_compress(encoderStateImpl->cinfo());
return true;
}
int JPEGImageEncoder::progressiveEncodeRowsJpegHelper(JPEGImageEncoderState* encoderState, unsigned char* data, int currentRowsCompleted, const double SlackBeforeDeadline, double deadlineSeconds)
{
JPEGImageEncoderStateImpl* encoderStateImpl = static_cast<JPEGImageEncoderStateImpl*>(encoderState);
Vector<JSAMPLE> row(encoderStateImpl->cinfo()->image_width * encoderStateImpl->cinfo()->input_components);
SET_JUMP_BUFFER(encoderStateImpl->cinfo(), ProgressiveEncodeFailed);
const size_t pixelRowStride = encoderStateImpl->cinfo()->image_width * 4;
unsigned char* pixels = data + pixelRowStride * currentRowsCompleted;
while (encoderStateImpl->cinfo()->next_scanline < encoderStateImpl->cinfo()->image_height) {
JSAMPLE* rowData = row.data();
RGBAtoRGB(pixels, encoderStateImpl->cinfo()->image_width, rowData);
jpeg_write_scanlines(encoderStateImpl->cinfo(), &rowData, 1);
pixels += pixelRowStride;
currentRowsCompleted++;
if (deadlineSeconds - SlackBeforeDeadline - monotonicallyIncreasingTime() <= 0) {
return currentRowsCompleted;
}
}
jpeg_finish_compress(encoderStateImpl->cinfo());
return currentRowsCompleted;
}