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