| 1 | ␊ |
| 2 | /* Graphic utility functions and data types␊ |
| 3 | * Prashant Vaibhav (C) 12/12/2008␊ |
| 4 | * Chameleon␊ |
| 5 | */␊ |
| 6 | ␊ |
| 7 | //Azi:include***␊ |
| 8 | //#include "boot.h" - included on "graphic_utils.h" (& graphics.h)...␊ |
| 9 | //#include "graphic_utils.h" - ... wich is included on graphics.h, that's included on gui.h :P␊ |
| 10 | #include "gui.h"␊ |
| 11 | ␊ |
| 12 | void blend( const pixmap_t *blendThis, // Source image␊ |
| 13 | pixmap_t *blendInto, // Dest image␊ |
| 14 | const position_t position) // Where to place the source image␊ |
| 15 | {␊ |
| 16 | uint16_t sx, sy, dx, dy;␊ |
| 17 | uint32_t dstrb, dstag, srcrb, srcag, drb, dag, rb, ag, alpha;␊ |
| 18 | ␉␊ |
| 19 | ␉uint16_t width = (blendThis->width + position.x < blendInto->width) ? blendThis->width: blendInto->width-position.x;␊ |
| 20 | ␉uint16_t height = (blendThis->height + position.y < blendInto->height) ? blendThis->height: blendInto->height-position.y;␊ |
| 21 | ␉␊ |
| 22 | for (dy = position.y, sy = 0; sy < height; dy++, sy++) {␊ |
| 23 | for (dx = position.x, sx = 0; sx < width; dx++, sx++) {␊ |
| 24 | alpha = (pixel(blendThis, sx, sy).ch.a);␊ |
| 25 | ␊ |
| 26 | ␉ /* Skip blending for fully transparent pixel */␊ |
| 27 | ␉ if (alpha == 0) continue;␊ |
| 28 | ␊ |
| 29 | ␉ /* For fully opaque pixel, there is no need to interpolate */␊ |
| 30 | ␉ if (alpha == 255) {␊ |
| 31 | ␉␉ pixel(blendInto, dx, dy).value = pixel(blendThis, sx, sy).value;␊ |
| 32 | ␉␉ continue;␊ |
| 33 | ␉ }␊ |
| 34 | ␊ |
| 35 | ␉ /* For semi-transparent pixels, do a full blend */␊ |
| 36 | ␉ //alpha++␊ |
| 37 | ␉␉ /* This is needed to spread the alpha over [0..256] instead of [0..255]␊ |
| 38 | ␉␉␉Boundary conditions were handled above */␊ |
| 39 | dstrb = pixel(blendInto, dx, dy).value & 0xFF00FF;␊ |
| 40 | dstag = (pixel(blendInto, dx, dy).value >> 8) & 0xFF00FF;␊ |
| 41 | srcrb = pixel(blendThis, sx, sy).value & 0xFF00FF;␊ |
| 42 | srcag = (pixel(blendThis, sx, sy).value >> 8) & 0xFF00FF;␊ |
| 43 | drb = srcrb - dstrb;␊ |
| 44 | dag = srcag - dstag;␊ |
| 45 | drb *= alpha; dag *= alpha;␊ |
| 46 | drb >>= 8; dag >>= 8;␊ |
| 47 | rb = (drb + dstrb) & 0x00FF00FF;␊ |
| 48 | ag = ((dag + dstag) << 8) & 0xFF00FF00;␊ |
| 49 | pixel(blendInto, dx, dy).value = (rb | ag);␊ |
| 50 | }␊ |
| 51 | }␊ |
| 52 | }␊ |
| 53 | ␊ |
| 54 | position_t centeredIn( const pixmap_t *background, const pixmap_t *toCenter )␊ |
| 55 | {␊ |
| 56 | position_t centered;␊ |
| 57 | centered.x = ( background->width - toCenter->width ) / 2;␊ |
| 58 | centered.y = ( background->height - toCenter->height ) / 2;␊ |
| 59 | return centered;␊ |
| 60 | }␊ |
| 61 | ␊ |
| 62 | position_t centeredAt( const pixmap_t *pixmap, const position_t center )␊ |
| 63 | {␊ |
| 64 | position_t topleft;␊ |
| 65 | topleft.x = center.x - (pixmap->width / 2);␊ |
| 66 | topleft.y = center.y - (pixmap->height / 2);␊ |
| 67 | return topleft;␊ |
| 68 | }␊ |
| 69 | ␊ |
| 70 | position_t pos(const uint16_t x, const uint16_t y) { position_t p; p.x = x; p.y = y; return p; }␊ |
| 71 | ␊ |
| 72 | void flipRB(pixmap_t *p)␊ |
| 73 | {␊ |
| 74 | ␉//if(testForQemu()) return;␊ |
| 75 | ␉␊ |
| 76 | ␉uint32_t x;␊ |
| 77 | register uint8_t tempB;␊ |
| 78 | ␉for (x = 0; x < (p->height) * (p->width) ; x++) {␊ |
| 79 | ␉␉tempB = (p->pixels[x]).ch.b;␊ |
| 80 | (p->pixels[x]).ch.b = (p->pixels[x]).ch.r;␊ |
| 81 | (p->pixels[x]).ch.r = tempB;␊ |
| 82 | ␉}␊ |
| 83 | }␊ |
| 84 | |
