diff options
Diffstat (limited to 'engines/titanic/star_control/surface_area.cpp')
| -rw-r--r-- | engines/titanic/star_control/surface_area.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/engines/titanic/star_control/surface_area.cpp b/engines/titanic/star_control/surface_area.cpp index 2d25d64541..5d72725636 100644 --- a/engines/titanic/star_control/surface_area.cpp +++ b/engines/titanic/star_control/surface_area.cpp @@ -106,4 +106,75 @@ void CSurfaceArea::pixelToRGB(uint pixel, uint *rgb) { } } +double CSurfaceArea::fn1(const FRect &rect) { + if (rect.empty()) + return rect.top; + + double xp = rect.left, yp = rect.top; + FRect r = rect; + + // edx=flags1, esi=flags2 + int flags1 = (r.left < _bounds.left ? 1 : 0) + | (r.left > _bounds.right ? 2 : 0) + | (r.top < _bounds.top ? 4 : 0) + | (r.top > _bounds.bottom ? 8 : 0); + int flags2 = (r.right < _bounds.left ? 1 : 0) + | (r.right > _bounds.right ? 2 : 0) + | (r.bottom < _bounds.top ? 4 : 0) + | (r.bottom > _bounds.bottom ? 8 : 0); + + // Handle any clipping + while (flags1 | flags2) { + if (flags1 & flags2) + return r.top; + + int flags = flags1 ? flags1 : flags2; + if ((flags & 1) || (flags & 2)) { + xp = (flags & 1) ? _bounds.left : _bounds.right; + yp = (r.bottom - r.top) * (xp - r.left) / (r.right - r.left) + r.top; + } else if ((flags & 4) || (flags & 8)) { + yp = (flags & 4) ? _bounds.top : _bounds.bottom; + xp = (r.right - r.left) * (yp - r.top) / (r.bottom - r.top) + r.left; + } + + if (flags == flags1) { + r.left = xp; + r.top = yp; + + flags1 = 0; + if (xp < _bounds.left) + flags1 |= 1; + if (xp > _bounds.right) + flags1 |= 2; + if (yp < _bounds.top) + flags1 |= 4; + if (yp > _bounds.bottom) + flags1 |= 8; + } else { + r.right = xp; + r.bottom = yp; + + flags2 = 0; + if (xp < _bounds.left) + flags2 |= 1; + if (xp > _bounds.right) + flags2 |= 2; + if (yp < _bounds.top) + flags2 |= 4; + if (yp > _bounds.bottom) + flags2 |= 8; + } + } + + Common::Rect rr(round(r.left), round(r.top), round(r.right), round(r.bottom)); + if (rr.left > rr.right) { + SWAP(rr.left, rr.right); + SWAP(rr.top, rr.bottom); + } + + // TODO: Lots more functionality + + return r.top; +} + } // End of namespace Titanic |