Initial commit.

code/png/png.h

@@ -0,0 +1,73 @@
+// Known chunk types
+
+#define PNG_IHDR		'IHDR'
+#define PNG_IDAT		'IDAT' 
+#define PNG_IEND 		'IEND'
+#define PNG_tEXt 		'tEXt'
+
+#define PNG_PLTE 		'PLTE'
+#define PNG_bKGD 		'bKGD'
+#define PNG_cHRM 		'cHRM'
+#define PNG_gAMA 		'gAMA'
+#define PNG_hIST 		'hIST'
+#define PNG_iCCP 		'iCCP'
+#define PNG_iTXt 		'iTXt'
+#define PNG_oFFs 		'oFFs'
+#define PNG_pCAL 		'pCAL'
+#define PNG_sCAL 		'sCAL'
+#define PNG_pHYs 		'pHYs'
+#define PNG_sBIT 		'sBIT'
+#define PNG_sPLT 		'sPLT'
+#define PNG_sRGB 		'sRGB'
+#define PNG_tIME 		'tIME'
+#define PNG_tRNS 		'tRNS'
+#define PNG_zTXt 		'zTXt'
+
+// Filter values 
+
+#define PNG_FILTER_VALUE_NONE	0
+#define PNG_FILTER_VALUE_SUB	1
+#define PNG_FILTER_VALUE_UP		2
+#define PNG_FILTER_VALUE_AVG	3
+#define PNG_FILTER_VALUE_PAETH	4
+#define PNG_FILTER_NUM			5
+
+// Common defines and typedefs
+
+#define MAX_PNG_WIDTH			4096
+#define MAX_PNG_DEPTH			4
+
+typedef unsigned char	byte;
+typedef unsigned short	word;
+typedef unsigned long	ulong;
+
+#pragma pack(push)
+#pragma pack(1)
+
+typedef struct png_ihdr_s
+{
+	ulong			width;
+	ulong			height;
+	byte			bitdepth;			// Bits per sample (not per pixel)
+	byte			colortype;			// bit 0 - palette; bit 1 - RGB; bit 2 - alpha channel
+	byte			compression;		// 0 for zip - error otherwise
+	byte			filter;				// 0 for adaptive with the 5 basic types - error otherwise
+	byte			interlace;			// 0 for no interlace - 1 for Adam7 interlace
+} png_ihdr_t;
+
+#pragma pack(pop)
+
+typedef struct png_image_s
+{
+	byte			*data;
+	ulong			width;
+	ulong			height;
+	ulong			bytedepth;
+	bool			isimage;
+} png_image_t;
+
+bool LoadPNG32 (char *name, byte **pixels, int *width, int *height, int *bytedepth);
+bool LoadPNG8 (char *name, byte **pixels, int *width, int *height);
+bool PNG_Save(const char *name, byte *data, int width, int height, int bytedepth);
+
+// end