| 1 | /* Graphic utility functions and data types␊ |
| 2 | * Prashant Vaibhav (C) 12/12/2008␊ |
| 3 | * Chameleon␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | // Everything here is 32 bits per pixel non-premultiplied ARGB format␊ |
| 7 | //␊ |
| 8 | ␊ |
| 9 | #ifndef GRAPHIC_UTILS_H␊ |
| 10 | #define GRAPHIC_UTILS_H␊ |
| 11 | ␊ |
| 12 | ␊ |
| 13 | ␊ |
| 14 | typedef union {␊ |
| 15 | struct {␊ |
| 16 | uint8_t b;␊ |
| 17 | uint8_t g;␊ |
| 18 | uint8_t r;␊ |
| 19 | uint8_t a;␊ |
| 20 | } ch;␊ |
| 21 | uint8_t channel[4];␊ |
| 22 | uint32_t value;␊ |
| 23 | } pixel_t;␊ |
| 24 | ␊ |
| 25 | typedef struct {␊ |
| 26 | uint16_t␉height;␊ |
| 27 | uint16_t␉width;␊ |
| 28 | pixel_t*␉pixels;␊ |
| 29 | } pixmap_t;␊ |
| 30 | ␊ |
| 31 | typedef struct {␊ |
| 32 | uint32_t x;␊ |
| 33 | uint32_t y;␊ |
| 34 | } position_t;␊ |
| 35 | ␊ |
| 36 | // Blends the given pixmap into the given background at the given position␊ |
| 37 | // Uses the alpha channels to blend, and preserves the final alpha (so the␊ |
| 38 | // resultant pixmap can be blended again with another background).␊ |
| 39 | // ported from www.stereopsis.com/doubleblend.html␊ |
| 40 | void blend( const pixmap_t *blendThis, // Source image␊ |
| 41 | pixmap_t *blendInto, // Dest image␊ |
| 42 | const position_t position); // Where to place the source image␊ |
| 43 | // Returns the topleft co-ordinate where if you put the 'toCenter' pixmap,␊ |
| 44 | // it is centered in the background.␊ |
| 45 | position_t centeredIn( const pixmap_t *background, const pixmap_t *toCenter );␊ |
| 46 | ␊ |
| 47 | // Returns the topleft co-ordinate where if you put the given pixmap, its␊ |
| 48 | // center will coincide with the th given center.␊ |
| 49 | position_t centeredAt( const pixmap_t *pixmap, const position_t center );␊ |
| 50 | ␊ |
| 51 | // Utility function returns a position_t struct given the x and y coords as uint16␊ |
| 52 | position_t pos(const uint16_t x, const uint16_t y);␊ |
| 53 | ␊ |
| 54 | // Flips the R and B components of all pixels in the given pixmap␊ |
| 55 | void flipRB(pixmap_t *p);␊ |
| 56 | ␊ |
| 57 | // Utility function to get pixel at (x,y) in a pixmap␊ |
| 58 | #define pixel(p,x,y) ((p)->pixels[(x) + (y) * (p)->width])␊ |
| 59 | ␊ |
| 60 | #endif//GRAPHIC_UTILS_H␊ |
| 61 | |
