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107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/********************************************************************************************
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PNGU Version : 0.2a
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Coder : frontier
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More info : http://frontier-dev.net
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Modified by Tantric, 2009
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********************************************************************************************/
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#ifndef __PNGU__
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#define __PNGU__
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// Return codes
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#define PNGU_OK 0
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#define PNGU_ODD_WIDTH 1
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#define PNGU_ODD_STRIDE 2
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#define PNGU_INVALID_WIDTH_OR_HEIGHT 3
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#define PNGU_FILE_IS_NOT_PNG 4
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#define PNGU_UNSUPPORTED_COLOR_TYPE 5
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#define PNGU_NO_FILE_SELECTED 6
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#define PNGU_CANT_OPEN_FILE 7
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#define PNGU_CANT_READ_FILE 8
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#define PNGU_LIB_ERROR 9
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// Color types
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#define PNGU_COLOR_TYPE_GRAY 1
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#define PNGU_COLOR_TYPE_GRAY_ALPHA 2
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#define PNGU_COLOR_TYPE_PALETTE 3
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#define PNGU_COLOR_TYPE_RGB 4
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#define PNGU_COLOR_TYPE_RGB_ALPHA 5
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#define PNGU_COLOR_TYPE_UNKNOWN 6
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Types
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typedef unsigned char PNGU_u8;
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typedef unsigned short PNGU_u16;
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typedef unsigned int PNGU_u32;
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typedef unsigned long long PNGU_u64;
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typedef struct
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{
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PNGU_u8 r;
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PNGU_u8 g;
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PNGU_u8 b;
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} PNGUCOLOR;
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typedef struct
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{
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PNGU_u32 imgWidth; // In pixels
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PNGU_u32 imgHeight; // In pixels
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PNGU_u32 imgBitDepth; // In bitx
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PNGU_u32 imgColorType; // PNGU_COLOR_TYPE_*
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PNGU_u32 validBckgrnd; // Non zero if there is a background color
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PNGUCOLOR bckgrnd; // Backgroun color
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PNGU_u32 numTrans; // Number of transparent colors
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PNGUCOLOR *trans; // Transparent colors
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} PNGUPROP;
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// Image context, always initialize with SelectImageFrom* and free with ReleaseImageContext
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struct _IMGCTX;
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typedef struct _IMGCTX *IMGCTX;
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/****************************************************************************
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* Image context handling *
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****************************************************************************/
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// Selects a PNG file, previosly loaded into a buffer, and creates an image context for subsequent procesing.
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IMGCTX PNGU_SelectImageFromBuffer (const void *buffer);
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// Selects a PNG file, from any devoptab device, and creates an image context for subsequent procesing.
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IMGCTX PNGU_SelectImageFromDevice (const char *filename);
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// Frees resources associated with an image context. Always call this function when you no longer need the IMGCTX.
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void PNGU_ReleaseImageContext (IMGCTX ctx);
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/****************************************************************************
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* Miscelaneous *
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****************************************************************************/
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// Retrieves info from selected PNG file, including image dimensions, color format, background and transparency colors.
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int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *fileproperties);
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/****************************************************************************
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* Image conversion *
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****************************************************************************/
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// Expands selected image into a 4x4 tiled RGBA8 buffer. You need to specify context, image dimensions,
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// destination address and default alpha value, which is used if the source image doesn't have an alpha channel.
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int PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha);
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int PNGU_EncodeFromRGB (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride);
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int PNGU_EncodeFromGXTexture (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride);
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#ifdef __cplusplus
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}
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#endif
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#endif
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