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/* Routines for manipulating wet pixels.
Copyright 1999 Raph Levien <raph@gimp.org>
Released under GPL.
A wet pixel is an eight word sequence, representing partially
transparent wet paint on a paper surface.
*/
typedef unsigned char byte;
typedef unsigned short u16;
typedef unsigned int u32;
typedef struct _WetPix WetPix;
typedef struct _WetLayer WetLayer;
typedef struct _WetPack WetPack;
typedef struct _WetPixDbl WetPixDbl;
/* White is made up of myth-red, myth-green, and myth-blue. Myth-red
looks red when viewed reflectively, but cyan when viewed
transmissively (thus, it vaguely resembles a dichroic
filter). Myth-red over black is red, and myth-red over white is
white.
Total red channel concentration is myth-red concentration plus
cyan concentration.
*/
struct _WetPix {
u16 rd; /* Total red channel concentration */
u16 rw; /* Myth-red concentration */
u16 gd; /* Total green channel concentration */
u16 gw; /* Myth-green concentration */
u16 bd; /* Total blue channel concentration */
u16 bw; /* Myth-blue concentration */
u16 w; /* Water volume */
u16 h; /* Height of paper surface */
};
struct _WetLayer {
WetPix *buf;
int width;
int height;
int rowstride;
};
struct _WetPack {
int n_layers;
WetLayer **layers;
};
struct _WetPixDbl {
double rd; /* Total red channel concentration */
double rw; /* Myth-red concentration */
double gd; /* Total green channel concentration */
double gw; /* Myth-green concentration */
double bd; /* Total blue channel concentration */
double bw; /* Myth-blue concentration */
double w; /* Water volume */
double h; /* Height of paper surface */
};
void wet_composite(byte * rgb, int rgb_rowstride,
WetPix * wet, int wet_rowstride,
int width, int height);
void wet_composite_layer(byte * rgb, int rgb_rowstride,
WetLayer * layer,
int x0, int y0, int width, int height);
void wet_pack_render(byte * rgb, int rgb_rowstride,
WetPack * pack,
int x0, int y0, int width, int height);
WetLayer *wet_layer_new(int width, int height);
void wet_layer_clear(WetLayer * layer);
WetPack *wet_pack_new(int width, int height);
void wet_pix_to_double(WetPixDbl * dst, WetPix * src);
void wet_pix_from_double(WetPix * dst, WetPixDbl * src);
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