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| Source at commit 429 created 13 years 8 months ago. By meklort, Updated module system. Hooks can now be used within modules when cetaion functions are called in chameleon. Note that onle two hooks currently exist, more need to be added. I also updated the HelloWorld module to use a hook instead of print out right away. | |
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| 1 | ␊ |
| 2 | /* Graphic utility functions and data types␊ |
| 3 | * Prashant Vaibhav (C) 12/12/2008␊ |
| 4 | * Chameleon␊ |
| 5 | */␊ |
| 6 | #include "boot.h"␊ |
| 7 | #include "graphic_utils.h"␊ |
| 8 | #include "gui.h"␊ |
| 9 | ␊ |
| 10 | void blend( const pixmap_t *blendThis, // Source image␊ |
| 11 | pixmap_t *blendInto, // Dest image␊ |
| 12 | const position_t position) // Where to place the source image␊ |
| 13 | {␊ |
| 14 | uint16_t sx, sy, dx, dy;␊ |
| 15 | uint32_t dstrb, dstag, srcrb, srcag, drb, dag, rb, ag, alpha;␊ |
| 16 | ␉␊ |
| 17 | ␉uint16_t width = (blendThis->width + position.x < blendInto->width) ? blendThis->width: blendInto->width-position.x;␊ |
| 18 | ␉uint16_t height = (blendThis->height + position.y < blendInto->height) ? blendThis->height: blendInto->height-position.y;␊ |
| 19 | ␉␊ |
| 20 | for (dy = position.y, sy = 0; sy < height; dy++, sy++) {␊ |
| 21 | for (dx = position.x, sx = 0; sx < width; dx++, sx++) {␊ |
| 22 | alpha = (pixel(blendThis, sx, sy).ch.a);␊ |
| 23 | ␊ |
| 24 | ␉ /* Skip blending for fully transparent pixel */␊ |
| 25 | ␉ if (alpha == 0) continue;␊ |
| 26 | ␊ |
| 27 | ␉ /* For fully opaque pixel, there is no need to interpolate */␊ |
| 28 | ␉ if (alpha == 255) {␊ |
| 29 | ␉␉ pixel(blendInto, dx, dy).value = pixel(blendThis, sx, sy).value;␊ |
| 30 | ␉␉ continue;␊ |
| 31 | ␉ }␊ |
| 32 | ␊ |
| 33 | ␉ /* For semi-transparent pixels, do a full blend */␊ |
| 34 | ␉ //alpha++␊ |
| 35 | ␉␉ /* This is needed to spread the alpha over [0..256] instead of [0..255]␊ |
| 36 | ␉␉␉Boundary conditions were handled above */␊ |
| 37 | dstrb = pixel(blendInto, dx, dy).value & 0xFF00FF;␊ |
| 38 | dstag = (pixel(blendInto, dx, dy).value >> 8) & 0xFF00FF;␊ |
| 39 | srcrb = pixel(blendThis, sx, sy).value & 0xFF00FF;␊ |
| 40 | srcag = (pixel(blendThis, sx, sy).value >> 8) & 0xFF00FF;␊ |
| 41 | drb = srcrb - dstrb;␊ |
| 42 | dag = srcag - dstag;␊ |
| 43 | drb *= alpha; dag *= alpha;␊ |
| 44 | drb >>= 8; dag >>= 8;␊ |
| 45 | rb = (drb + dstrb) & 0x00FF00FF;␊ |
| 46 | ag = ((dag + dstag) << 8) & 0xFF00FF00;␊ |
| 47 | pixel(blendInto, dx, dy).value = (rb | ag);␊ |
| 48 | }␊ |
| 49 | }␊ |
| 50 | }␊ |
| 51 | ␊ |
| 52 | position_t centeredIn( const pixmap_t *background, const pixmap_t *toCenter )␊ |
| 53 | {␊ |
| 54 | position_t centered;␊ |
| 55 | centered.x = ( background->width - toCenter->width ) / 2;␊ |
| 56 | centered.y = ( background->height - toCenter->height ) / 2;␊ |
| 57 | return centered;␊ |
| 58 | }␊ |
| 59 | ␊ |
| 60 | position_t centeredAt( const pixmap_t *pixmap, const position_t center )␊ |
| 61 | {␊ |
| 62 | position_t topleft;␊ |
| 63 | topleft.x = center.x - (pixmap->width / 2);␊ |
| 64 | topleft.y = center.y - (pixmap->height / 2);␊ |
| 65 | return topleft;␊ |
| 66 | }␊ |
| 67 | ␊ |
| 68 | position_t pos(const uint16_t x, const uint16_t y) { position_t p; p.x = x; p.y = y; return p; }␊ |
| 69 | ␊ |
| 70 | void flipRB(pixmap_t *p)␊ |
| 71 | {␊ |
| 72 | ␉//if(testForQemu()) return;␊ |
| 73 | ␉␊ |
| 74 | ␉uint32_t x;␊ |
| 75 | register uint8_t tempB;␊ |
| 76 | ␉for (x = 0; x < (p->height) * (p->width) ; x++) {␊ |
| 77 | ␉␉tempB = (p->pixels[x]).ch.b;␊ |
| 78 | (p->pixels[x]).ch.b = (p->pixels[x]).ch.r;␊ |
| 79 | (p->pixels[x]).ch.r = tempB;␊ |
| 80 | ␉}␊ |
| 81 | }␊ |
| 82 | |
