code_app/modules/imgfmt/HGPng.h

#ifndef __HGPNG_H__
#define __HGPNG_H__

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

/*  */
#define HGIMGFMT_PNGCLRTYPE_GRAY		0L
#define HGIMGFMT_PNGCLRTYPE_PALETTE		(1L | 2L)
#define HGIMGFMT_PNGCLRTYPE_RGB			2L
#define HGIMGFMT_PNGCLRTYPE_RGB_ALPHA	(2L | 4L)
#define HGIMGFMT_PNGCLRTYPE_GRAY_ALPHA	4L

/*  */
#define HGIMGFMT_PNGFILTERTYPE_BASE		0L
/*  */
#define HGIMGFMT_PNGINTERLACE_NONE		0L
#define HGIMGFMT_PNGINTERLACE_ADAM7		1L
#define HGIMGFMT_PNGINTERLACE_LAST		2L
/*  */
#define HGIMGFMT_PNGCOMPTYPE_BASE		0L

/* 分辨率单位 */
#define HGIMGFMT_PNGPHYSUNIT_UNKNOWN	0L
#define HGIMGFMT_PNGPHYSUNIT_METER		1L
#define HGIMGFMT_PNGPHYSUNIT_LAST		2L

typedef struct
{
	HGUInt width; /* 图像宽 */
	HGUInt height; /* 图像高 */
	HGByte bitDepth; /* 每通道的比特数 */
	HGByte colorType; /* 色彩类型, 见HGIMGFMT_PNGCLRTYPE_* */
	HGByte channels; /* 通道数 */
	HGByte filterType; /* 见HGIMGFMT_PNGFILTERTYPE_* */
	HGByte InterlaceType; /* 见HGIMGFMT_PNGINTERLACE_* */
	HGByte compressionType; /* 见HGIMGFMT_PNGCOMPTYPE_* */
	HGByte pixelDepth; /* 每像素的比特数 */
	HGByte physUnitType; /* 分辨率单位, 见HGIMGFMT_PNGPHYSUNIT_* */
	HGUInt xPixelsPerUnit; /* 分辨率x */
	HGUInt yPixelsPerUnit; /* 分辨率y */
}HGPngLoadInfo;

typedef struct
{
	HGByte physUnitType; /* 分辨率单位, 见HGIMGFMT_PNGPHYSUNIT_* */
	HGUInt xPixelsPerUnit; /* 分辨率x */
	HGUInt yPixelsPerUnit; /* 分辨率y */
}HGPngSaveInfo;

HGEXPORT HGResult HGAPI HGImgFmt_CheckPngFile(const HGChar* fileName, HGBool* isPng);

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

HGEXPORT HGResult HGAPI HGImgFmt_SavePngImage(HGImage image, const HGPngSaveInfo* info, const HGChar* fileName);

#endif /* __HGPNG_H__ */