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Golang struct_jpeg_compress_struct.raw_data_in方法代碼示例

本文整理匯總了Golang中C.struct_jpeg_compress_struct.raw_data_in方法的典型用法代碼示例。如果您正苦於以下問題：Golang struct_jpeg_compress_struct.raw_data_in方法的具體用法？Golang struct_jpeg_compress_struct.raw_data_in怎麽用？Golang struct_jpeg_compress_struct.raw_data_in使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類C.struct_jpeg_compress_struct的用法示例。


在下文中一共展示了struct_jpeg_compress_struct.raw_data_in方法的4個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。

示例1: encodeYCbCr

// encode image.YCbCr
func encodeYCbCr(cinfo *C.struct_jpeg_compress_struct, src *image.YCbCr, p *EncoderOptions) (err error) {
	// Set up compression parameters
	cinfo.image_width = C.JDIMENSION(src.Bounds().Dx())
	cinfo.image_height = C.JDIMENSION(src.Bounds().Dy())
	cinfo.input_components = 3
	cinfo.in_color_space = C.JCS_YCbCr

	C.jpeg_set_defaults(cinfo)
	setupEncoderOptions(cinfo, p)

	compInfo := (*[3]C.jpeg_component_info)(unsafe.Pointer(cinfo.comp_info))
	colorVDiv := 1
	switch src.SubsampleRatio {
	case image.YCbCrSubsampleRatio444:
		// 1x1,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 1, 1
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
	case image.YCbCrSubsampleRatio440:
		// 1x2,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 1, 2
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
		colorVDiv = 2
	case image.YCbCrSubsampleRatio422:
		// 2x1,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 2, 1
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
	case image.YCbCrSubsampleRatio420:
		// 2x2,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 2, 2
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
		colorVDiv = 2
	}

	// libjpeg raw data in is in planar format, which avoids unnecessary
	// planar->packed->planar conversions.
	cinfo.raw_data_in = C.TRUE

	// Start compression
	C.jpeg_start_compress(cinfo, C.TRUE)
	C.encode_ycbcr(
		cinfo,
		C.JSAMPROW(unsafe.Pointer(&src.Y[0])),
		C.JSAMPROW(unsafe.Pointer(&src.Cb[0])),
		C.JSAMPROW(unsafe.Pointer(&src.Cr[0])),
		C.int(src.YStride),
		C.int(src.CStride),
		C.int(colorVDiv),
	)
	C.jpeg_finish_compress(cinfo)
	return
}
開發者ID:ieee0824，項目名稱:go-libjpeg，代碼行數:56，代碼來源:compress.go

示例2: encodeGray

// encode image.Gray
func encodeGray(cinfo *C.struct_jpeg_compress_struct, src *image.Gray, p *EncoderOptions) (err error) {
	// Set up compression parameters
	cinfo.image_width = C.JDIMENSION(src.Bounds().Dx())
	cinfo.image_height = C.JDIMENSION(src.Bounds().Dy())
	cinfo.input_components = 1
	cinfo.in_color_space = C.JCS_GRAYSCALE

	C.jpeg_set_defaults(cinfo)
	setupEncoderOptions(cinfo, p)

	compInfo := (*C.jpeg_component_info)(unsafe.Pointer(cinfo.comp_info))
	compInfo.h_samp_factor, compInfo.v_samp_factor = 1, 1

	// libjpeg raw data in is in planar format, which avoids unnecessary
	// planar->packed->planar conversions.
	cinfo.raw_data_in = C.TRUE

	// Start compression
	C.jpeg_start_compress(cinfo, C.TRUE)

	// Allocate JSAMPIMAGE to hold pointers to one iMCU worth of image data
	// this is a safe overestimate; we use the return value from
	// jpeg_read_raw_data to figure out what is the actual iMCU row count.
	var rowPtr [AlignSize]C.JSAMPROW
	arrayPtr := [1]C.JSAMPARRAY{
		C.JSAMPARRAY(unsafe.Pointer(&rowPtr[0])),
	}

	var rows C.JDIMENSION
	for rows = 0; rows < cinfo.image_height; {
		// First fill in the pointers into the plane data buffers
		for j := 0; j < int(C.DCTSIZE*compInfo.v_samp_factor); j++ {
			rowPtr[j] = C.JSAMPROW(unsafe.Pointer(&src.Pix[src.Stride*(int(rows)+j)]))
		}
		// Get the data
		rows += C.jpeg_write_raw_data(cinfo, C.JSAMPIMAGE(unsafe.Pointer(&arrayPtr[0])), C.JDIMENSION(C.DCTSIZE*compInfo.v_samp_factor))
	}

	C.jpeg_finish_compress(cinfo)
	return
}
開發者ID:edvakf，項目名稱:go-libjpeg，代碼行數:42，代碼來源:compress.go

示例3: encodeGray

// encode image.Gray
func encodeGray(cinfo *C.struct_jpeg_compress_struct, src *image.Gray, p *EncoderOptions) (err error) {
	// Set up compression parameters
	cinfo.image_width = C.JDIMENSION(src.Bounds().Dx())
	cinfo.image_height = C.JDIMENSION(src.Bounds().Dy())
	cinfo.input_components = 1
	cinfo.in_color_space = C.JCS_GRAYSCALE

	C.jpeg_set_defaults(cinfo)
	setupEncoderOptions(cinfo, p)

	compInfo := (*C.jpeg_component_info)(unsafe.Pointer(cinfo.comp_info))
	compInfo.h_samp_factor, compInfo.v_samp_factor = 1, 1

	// libjpeg raw data in is in planar format, which avoids unnecessary
	// planar->packed->planar conversions.
	cinfo.raw_data_in = C.TRUE

	// Start compression
	C.jpeg_start_compress(cinfo, C.TRUE)
	C.encode_gray(cinfo, C.JSAMPROW(unsafe.Pointer(&src.Pix[0])), C.int(src.Stride))
	C.jpeg_finish_compress(cinfo)
	return
}
開發者ID:ieee0824，項目名稱:go-libjpeg，代碼行數:24，代碼來源:compress.go

示例4: encodeYCbCr

// encode image.YCbCr
func encodeYCbCr(cinfo *C.struct_jpeg_compress_struct, src *image.YCbCr, p *EncoderOptions) (err error) {
	// Set up compression parameters
	cinfo.image_width = C.JDIMENSION(src.Bounds().Dx())
	cinfo.image_height = C.JDIMENSION(src.Bounds().Dy())
	cinfo.input_components = 3
	cinfo.in_color_space = C.JCS_YCbCr

	C.jpeg_set_defaults(cinfo)
	setupEncoderOptions(cinfo, p)

	compInfo := (*[3]C.jpeg_component_info)(unsafe.Pointer(cinfo.comp_info))
	colorVDiv := 1
	switch src.SubsampleRatio {
	case image.YCbCrSubsampleRatio444:
		// 1x1,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 1, 1
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
	case image.YCbCrSubsampleRatio440:
		// 1x2,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 1, 2
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
		colorVDiv = 2
	case image.YCbCrSubsampleRatio422:
		// 2x1,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 2, 1
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
	case image.YCbCrSubsampleRatio420:
		// 2x2,1x1,1x1
		compInfo[Y].h_samp_factor, compInfo[Y].v_samp_factor = 2, 2
		compInfo[Cb].h_samp_factor, compInfo[Cb].v_samp_factor = 1, 1
		compInfo[Cr].h_samp_factor, compInfo[Cr].v_samp_factor = 1, 1
		colorVDiv = 2
	}

	// libjpeg raw data in is in planar format, which avoids unnecessary
	// planar->packed->planar conversions.
	cinfo.raw_data_in = C.TRUE

	// Start compression
	C.jpeg_start_compress(cinfo, C.TRUE)

	// Allocate JSAMPIMAGE to hold pointers to one iMCU worth of image data
	// this is a safe overestimate; we use the return value from
	// jpeg_read_raw_data to figure out what is the actual iMCU row count.
	var yRowPtr [AlignSize]C.JSAMPROW
	var cbRowPtr [AlignSize]C.JSAMPROW
	var crRowPtr [AlignSize]C.JSAMPROW
	yCbCrPtr := [3]C.JSAMPARRAY{
		C.JSAMPARRAY(unsafe.Pointer(&yRowPtr[0])),
		C.JSAMPARRAY(unsafe.Pointer(&cbRowPtr[0])),
		C.JSAMPARRAY(unsafe.Pointer(&crRowPtr[0])),
	}

	var rows C.JDIMENSION
	for rows = 0; rows < cinfo.image_height; {
		// First fill in the pointers into the plane data buffers
		for j := 0; j < int(C.DCTSIZE*compInfo[Y].v_samp_factor); j++ {
			yRowPtr[j] = C.JSAMPROW(unsafe.Pointer(&src.Y[src.YStride*(int(rows)+j)]))
		}
		for j := 0; j < int(C.DCTSIZE*compInfo[Cb].v_samp_factor); j++ {
			cbRowPtr[j] = C.JSAMPROW(unsafe.Pointer(&src.Cb[src.CStride*(int(rows)/colorVDiv+j)]))
			crRowPtr[j] = C.JSAMPROW(unsafe.Pointer(&src.Cr[src.CStride*(int(rows)/colorVDiv+j)]))
		}
		// Get the data
		rows += C.jpeg_write_raw_data(cinfo, C.JSAMPIMAGE(unsafe.Pointer(&yCbCrPtr[0])), C.JDIMENSION(C.DCTSIZE*compInfo[0].v_samp_factor))
	}

	C.jpeg_finish_compress(cinfo)
	return
}
開發者ID:edvakf，項目名稱:go-libjpeg，代碼行數:74，代碼來源:compress.go


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