Esempio n. 1
0
func setupDecoderOptions(dinfo *C.struct_jpeg_decompress_struct, opt *DecoderOptions) {
	tw, th := opt.ScaleTarget.Dx(), opt.ScaleTarget.Dy()
	if tw > 0 && th > 0 {
		var scaleFactor int
		for scaleFactor = 1; scaleFactor <= 8; scaleFactor++ {
			if ((scaleFactor*int(dinfo.image_width)+7)/8) >= tw &&
				((scaleFactor*int(dinfo.image_height)+7)/8) >= th {
				break
			}
		}
		if scaleFactor < 8 {
			dinfo.scale_num = C.uint(scaleFactor)
			dinfo.scale_denom = 8
		}
	}

	dinfo.dct_method = C.J_DCT_METHOD(opt.DCTMethod)
	if opt.DisableFancyUpsampling {
		dinfo.do_fancy_upsampling = C.FALSE
	} else {
		dinfo.do_fancy_upsampling = C.TRUE
	}
	if opt.DisableBlockSmoothing {
		dinfo.do_block_smoothing = C.FALSE
	} else {
		dinfo.do_block_smoothing = C.TRUE
	}
}
Esempio n. 2
0
func setupEncoderOptions(cinfo *C.struct_jpeg_compress_struct, opt *EncoderOptions) {
	C.jpeg_set_quality(cinfo, C.int(opt.Quality), C.TRUE)
	if opt.OptimizeCoding {
		cinfo.optimize_coding = C.TRUE
	} else {
		cinfo.optimize_coding = C.FALSE
	}
	cinfo.dct_method = C.J_DCT_METHOD(opt.DCTMethod)
}