code_app/modules/imgfmt/HGJpeg.h

#ifndef __HGJPEG_H__
#define __HGJPEG_H__

#include "../base/HGDef.h"
#include "../base/HGBaseErr.h"
#include "HGImgFmtErr.h"
#include "../base/HGImage.h"
#include "../base/HGBuffer.h"

/* 颜色空间 */
#define HGIMGFMT_JPEGCLRSPACE_UNKNOWN	0L
#define HGIMGFMT_JPEGCLRSPACE_GRAYSCALE	1L
#define HGIMGFMT_JPEGCLRSPACE_RGB		2L

/* 分辨率单位 */
#define HGIMGFMT_JPEGDENUNIT_INCH	1L		/* 英寸 */
#define HGIMGFMT_JPEGDENUNIT_CENTIMETER	2L	/* 厘米 */

typedef struct
{
	HGUInt width; /* 图像宽 */
	HGUInt height; /* 图像高 */
	HGUInt numComponents; /* 颜色数量 */
	HGUInt colorSpace; /* 颜色空间, 见HGIMGFMT_JPEGCLRSPACE_* */
	HGByte densityUnit; /* 分辨率单位, 见HGIMGFMT_JPEGDENUNIT_* */
	HGUShort xDensity; /* 分辨率x值 */
	HGUShort yDensity; /* 分辨率y值 */
}HGJpegLoadInfo;

typedef struct
{
	HGUInt quality; /* 压缩质量, 0-100 */
	HGByte densityUnit; /* 分辨率单位, 见HGIMGFMT_JPEGDENUNIT_* */
	HGUShort xDensity; /* 分辨率x值 */
	HGUShort yDensity; /* 分辨率y值 */
}HGJpegSaveInfo;

HGEXPORT HGResult HGAPI HGImgFmt_CheckJpegFile(const HGChar* fileName, HGBool *isJpeg);

HGEXPORT HGResult HGAPI HGImgFmt_LoadJpegImage(const HGChar* fileName, HGJpegLoadInfo* info,
	HGUInt imgType, HGUInt imgOrigin, HGImage* image);

HGEXPORT HGResult HGAPI HGImgFmt_LoadJpegImageFromBuffer(HGBuffer buffer, HGJpegLoadInfo* info,
	HGUInt imgType, HGUInt imgOrigin, HGImage* image);

HGEXPORT HGResult HGAPI HGImgFmt_SaveJpegImage(HGImage image, const HGJpegSaveInfo* info, const HGChar* fileName);

HGEXPORT HGResult HGAPI HGImgFmt_SaveJpegImageToBuffer(HGImage image, const HGJpegSaveInfo* info, HGBuffer *buffer);

#endif /* __HGJPEG_H__ */