private void assembleOperation(IMOperation op, Parameters params, Dimension fullSize) {
// region transformation
Region region = params.getRegion();
if (!region.isFull()) {
if (region.isPercent()) {
// im4java doesn't support cropping x/y by percentage (only
// width/height), so we have to calculate them.
int x = Math.round(region.getX() / 100.0f * fullSize.width);
int y = Math.round(region.getY() / 100.0f * fullSize.height);
int width = Math.round(region.getWidth());
int height = Math.round(region.getHeight());
op.crop(width, height, x, y, "%");
} else {
op.crop(
Math.round(region.getWidth()), Math.round(region.getHeight()),
Math.round(region.getX()), Math.round(region.getY()));
}
}
// size transformation
Size size = params.getSize();
if (size.getScaleMode() != Size.ScaleMode.FULL) {
if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_WIDTH) {
op.resize(size.getWidth());
} else if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_HEIGHT) {
op.resize(null, size.getHeight());
} else if (size.getScaleMode() == Size.ScaleMode.NON_ASPECT_FILL) {
op.resize(size.getWidth(), size.getHeight(), "!".charAt(0));
} else if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_INSIDE) {
op.resize(size.getWidth(), size.getHeight());
} else if (size.getPercent() != null) {
op.resize(Math.round(size.getPercent()), Math.round(size.getPercent()), "%".charAt(0));
}
}
// rotation transformation
Rotation rotation = params.getRotation();
if (rotation.shouldMirror()) {
op.flop();
}
if (rotation.getDegrees() != 0) {
op.rotate(rotation.getDegrees().doubleValue());
}
// quality transformation
Quality quality = params.getQuality();
if (quality != Quality.COLOR && quality != Quality.DEFAULT) {
switch (quality) {
case GRAY:
op.colorspace("Gray");
break;
case BITONAL:
op.monochrome();
break;
}
}
}
/**
* @param inputPath Absolute filename pathname or "-" to use a stream
* @param inputStream Can be null
* @param params
* @param sourceFormat
* @param fullSize
* @param outputStream Stream to write to
* @throws ProcessorException
*/
private void doProcess(
String inputPath,
InputStream inputStream,
Parameters params,
SourceFormat sourceFormat,
Dimension fullSize,
OutputStream outputStream)
throws ProcessorException {
final Set<OutputFormat> availableOutputFormats = getAvailableOutputFormats(sourceFormat);
if (getAvailableOutputFormats(sourceFormat).size() < 1) {
throw new UnsupportedSourceFormatException(sourceFormat);
} else if (!availableOutputFormats.contains(params.getOutputFormat())) {
throw new UnsupportedOutputFormatException();
}
try {
IMOperation op = new IMOperation();
op.addImage(inputPath);
assembleOperation(op, params, fullSize);
op.addImage(params.getOutputFormat().getExtension() + ":-"); // write to stdout
ConvertCmd convert = new ConvertCmd(true);
String binaryPath =
Application.getConfiguration().getString("GraphicsMagickProcessor.path_to_binaries", "");
if (binaryPath.length() > 0) {
convert.setSearchPath(binaryPath);
}
if (inputStream != null) {
convert.setInputProvider(new Pipe(inputStream, null));
}
convert.setOutputConsumer(new Pipe(null, outputStream));
convert.run(op);
} catch (InterruptedException | IM4JavaException | IOException e) {
throw new ProcessorException(e.getMessage(), e);
}
}