FloydSteinbergDither.cpp File Reference

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Classes
struct	RGBTriple
struct	RGBPalette
struct	RGBImage
struct	PalettizedImage
Defines
#define	plus_truncate_uchar(a, b)
#define	compute_disperse(channel)
Functions
static unsigned char	FindNearestColor (RGBTriple color, RGBPalette palette)
PalettizedImage	FloydSteinbergDitherer (RGBImage image, RGBPalette palette)

---

Define Documentation

#define plus_truncate_uchar	(	a,
		b		)

Value:

if (((int)(a)) + (b) < 0) \
        (a) = 0; \
    else if (((int)(a)) + (b) > 255) \
        (a) = 255; \
    else \
        (a) += (b);

Definition at line 30 of file FloydSteinbergDither.cpp.

#define compute_disperse

(

channel

)

Value:

error = ((int)(currentPixel->channel)) - palette.table[index].channel; \
if (x + 1 < image.width && image.pixels[(x+1) + (y+0)*image.width].A>0) { \
    plus_truncate_uchar(image.pixels[(x+1) + (y+0)*image.width].channel, (error*7) >> 4); \
} \
if (y + 1 < image.height) { \
    if (x - 1 > 0 && image.pixels[(x-1) + (y+1)*image.width].A>0) { \
        plus_truncate_uchar(image.pixels[(x-1) + (y+1)*image.width].channel, (error*3) >> 4); \
    } \
   if (image.pixels[(x+0) + (y+1)*image.width].A>0) { \
      plus_truncate_uchar(image.pixels[(x+0) + (y+1)*image.width].channel, (error*5) >> 4); \
   }\
    if (x + 1 < image.width && image.pixels[(x+1) + (y+1)*image.width].A>0) { \
        plus_truncate_uchar(image.pixels[(x+1) + (y+1)*image.width].channel, (error*1) >> 4); \
    } \
}

Definition at line 57 of file FloydSteinbergDither.cpp.

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Function Documentation

static unsigned char FindNearestColor	(	RGBTriple	color,
		RGBPalette	palette
	)			[static]

Definition at line 40 of file FloydSteinbergDither.cpp.

PalettizedImage FloydSteinbergDitherer	(	RGBImage	image,
		RGBPalette	palette
	)

Definition at line 75 of file FloydSteinbergDither.cpp.