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#include <stdio.h>
struct TGAHeader {
unsigned char IDBlockSize;
unsigned char gotMap;
bool compressed;
unsigned short int firstPalColour;
unsigned short int numPalColours;
unsigned char bitsPerPalColour;
unsigned short xOrigin;
unsigned short yOrigin;
unsigned short width;
unsigned short height;
unsigned char pixelDepth;
unsigned char imageDescriptor;
};
struct palCol
{
unsigned char r,g,b;
};
void grabRGBCompressed (FILE * fp, int bpc, unsigned char & r2, unsigned char & g2, unsigned char & b2, palCol thePalette[]);
void grabRGB (FILE * fp, int bpc, unsigned char & r, unsigned char & g, unsigned char & b, palCol thePalette[]);
void grabRGBACompressed (FILE * fp, int bpc, unsigned char & r2, unsigned char & g2, unsigned char & b2, unsigned char & a2, palCol thePalette[]);
void grabRGBA (FILE * fp, int bpc, unsigned char & r, unsigned char & g, unsigned char & b,unsigned char & a, palCol thePalette[]);
unsigned short int makeColour (unsigned char r, unsigned char g, unsigned char b);
unsigned short readAColour (FILE * fp, int bpc, palCol thePalette[], int x, int y);
unsigned short readCompressedColour (FILE * fp, int bpc, palCol thePalette[], int x, int y);
const char * readTGAHeader (TGAHeader & h, FILE * fp, palCol thePalette[]);
void setDither (int dither);
bool getDither ();
inline unsigned short redValue (unsigned short c) { return (c >> 11) << 3; }
inline unsigned short greenValue (unsigned short c) { return ((c >> 5) & 63) << 2; }
inline unsigned short blueValue (unsigned short c) { return (c & 31) << 3; }
inline int brightness (unsigned short c) {
return ((int) redValue (c)) + ((int) greenValue (c)) + ((int) blueValue (c) >> 1);
}
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