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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
//=============================================================================
//
// Helper struct for scaling coordinates
//
// TODO: rewrite into proper Transform class.
// Maybe implement as real matrix and/or floats if that is better/runs faster.
//
//=============================================================================
#ifndef AGS_SHARED_UTIL_SCALING_H
#define AGS_SHARED_UTIL_SCALING_H
#include "ags/shared/core/types.h"
#include "ags/shared/util/geometry.h"
namespace AGS3 {
namespace AGS {
namespace Shared {
class AxisScaling {
public:
AxisScaling()
: _scale(kUnit)
, _unscale(kUnit)
, _srcOffset(0)
, _dstOffset(0) {
}
bool IsIdentity() const {
return _scale == kUnit && _srcOffset == 0 && _dstOffset == 0;
}
bool IsTranslateOnly() const {
return _scale == kUnit;
}
void Init(const int32_t src_length, const int32_t dst_length, const int32_t src_offset = 0, const int32_t dst_offset = 0) {
_scale = kUnit;
_unscale = kUnit;
_srcOffset = src_offset;
_dstOffset = dst_offset;
if (src_length != 0) {
int32_t scale = (dst_length << kShift) / src_length;
if (scale != 0) {
_scale = scale;
_unscale = scale;
int32_t scaled_val = ScaleDistance(src_length);
if (scaled_val < dst_length)
_scale++;
}
}
}
void SetSrcOffset(int32_t x) {
_srcOffset = x;
}
void SetDstOffset(int32_t x) {
_dstOffset = x;
}
inline int32_t GetSrcOffset() const {
return _srcOffset;
}
inline int32_t ScalePt(int32_t x) const {
return (((x - _srcOffset) * _scale) >> kShift) + _dstOffset;
}
inline int32_t ScaleDistance(int32_t x) const {
return ((x * _scale) >> kShift);
}
inline int32_t UnScalePt(int32_t x) const {
return ((x - _dstOffset) << kShift) / _unscale + _srcOffset;
}
inline int32_t UnScaleDistance(int32_t x) const {
return (x << kShift) / _unscale;
}
private:
int32_t _scale;
int32_t _unscale;
int32_t _srcOffset;
int32_t _dstOffset;
};
struct PlaneScaling {
AxisScaling X;
AxisScaling Y;
bool IsIdentity() const {
return X.IsIdentity() && Y.IsIdentity();
}
bool IsTranslateOnly() const {
return X.IsTranslateOnly() && Y.IsTranslateOnly();
}
void Init(const Size &src_size, const Rect &dst_rect) {
X.Init(src_size.Width, dst_rect.GetWidth(), 0, dst_rect.Left);
Y.Init(src_size.Height, dst_rect.GetHeight(), 0, dst_rect.Top);
}
void Init(const Rect &src_rect, const Rect &dst_rect) {
X.Init(src_rect.GetWidth(), dst_rect.GetWidth(), src_rect.Left, dst_rect.Left);
Y.Init(src_rect.GetHeight(), dst_rect.GetHeight(), src_rect.Top, dst_rect.Top);
}
void SetSrcOffsets(int x, int y) {
X.SetSrcOffset(x);
Y.SetSrcOffset(y);
}
void SetDestOffsets(int x, int y) {
X.SetDstOffset(x);
Y.SetDstOffset(y);
}
inline Point Scale(const Point &p) const {
return Point(X.ScalePt(p.X), Y.ScalePt(p.Y));
}
inline Rect ScaleRange(const Rect &r) const {
return RectWH(X.ScalePt(r.Left), Y.ScalePt(r.Top), X.ScaleDistance(r.GetWidth()), Y.ScaleDistance(r.GetHeight()));
}
inline Point UnScale(const Point &p) const {
return Point(X.UnScalePt(p.X), Y.UnScalePt(p.Y));
}
inline Rect UnScaleRange(const Rect &r) const {
return RectWH(X.UnScalePt(r.Left), Y.UnScalePt(r.Top), X.UnScaleDistance(r.GetWidth()), Y.UnScaleDistance(r.GetHeight()));
}
};
} // namespace Shared
} // namespace AGS
} // namespace AGS3
#endif
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