diff options
Diffstat (limited to 'engines/sci/gui')
| -rw-r--r-- | engines/sci/gui/gui_gfx.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/engines/sci/gui/gui_gfx.cpp b/engines/sci/gui/gui_gfx.cpp index 69205fab54..18f5a8131c 100644 --- a/engines/sci/gui/gui_gfx.cpp +++ b/engines/sci/gui/gui_gfx.cpp @@ -923,19 +923,22 @@ static inline int sign_extend_byte(int value) { } void SciGuiGfx::PriorityBandsInit(int16 bandCount, int16 top, int16 bottom) { - double bandSize; int16 y; + int32 bandSize; if (bandCount != -1) _priorityBandCount = bandCount; _priorityTop = top; _priorityBottom = bottom; - bandSize = (_priorityBottom - _priorityTop) / (_priorityBandCount); - memset(_priorityBands, 0, _priorityTop); + // Do NOT modify this algo or optimize it anyhow, sierra sci used int32 for calculating the + // priority bands and by using double or anything rounding may destroy the result + bandSize = ((_priorityBottom - _priorityTop) * 2000) / 14; + + memset(_priorityBands, 0, sizeof(byte) * _priorityTop); for (y = _priorityTop; y < _priorityBottom; y++) - _priorityBands[y] = (byte)(1 + (y - _priorityTop) / bandSize); + _priorityBands[y] = 1 + (((y - _priorityTop) * 2000) / bandSize); for (y = _priorityBottom; y < _screen->_height; y++) _priorityBands[y] = _priorityBandCount; } |