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; } } }