| … | |
… | |
| 474 | } |
474 | } |
| 475 | |
475 | |
| 476 | rxvt_color |
476 | rxvt_color |
| 477 | rxvt_color::fade (rxvt_display *display, int percent) |
477 | rxvt_color::fade (rxvt_display *display, int percent) |
| 478 | { |
478 | { |
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479 | percent = 100 - percent; |
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480 | |
| 479 | unsigned short cr, cg, cb; |
481 | unsigned short cr, cg, cb; |
| 480 | rxvt_color faded; |
482 | rxvt_color faded; |
| 481 | |
483 | |
| 482 | get (display, cr, cg, cb); |
484 | get (display, cr, cg, cb); |
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485 | |
| 483 | faded.set (display, |
486 | faded.set ( |
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487 | display, |
| 484 | cr * percent / 100, |
488 | cr * percent / 100, |
| 485 | cg * percent / 100, |
489 | cg * percent / 100, |
| 486 | cb * percent / 100); |
490 | cb * percent / 100 |
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491 | ); |
| 487 | |
492 | |
| 488 | return faded; |
493 | return faded; |
| 489 | } |
494 | } |
| 490 | |
495 | |
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496 | #define LERP(a,b,p) (a * p / 100 + b * (100 - p) / 100) |
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497 | |
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498 | rxvt_color |
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499 | rxvt_color::fade (rxvt_display *display, int percent, rxvt_color &fadeto) |
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500 | { |
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501 | percent = 100 - percent; |
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502 | |
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503 | unsigned short cr, cg, cb; |
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504 | unsigned short fcr, fcg, fcb; |
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505 | rxvt_color faded; |
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506 | |
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507 | get (display, cr, cg, cb); |
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508 | fadeto.get(display, fcr, fcg, fcb); |
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509 | |
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510 | faded.set ( |
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511 | display, |
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512 | LERP (cr, fcr, percent), |
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513 | LERP (cg, fcg, percent), |
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514 | LERP (cb, fcb, percent) |
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515 | ); |
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516 | |
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517 | return faded; |
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518 | } |
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519 | |
