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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdint.h>
#include <sys/types.h>
#include <array>
#include <ostream>
#include <string>
#include <math/mat4.h>
#include <math/vec2.h>
#include <math/vec3.h>
#include <ui/Point.h>
#include <ui/Rect.h>
#include <ui/Rotation.h>
namespace android {
class Region;
namespace ui {
class Transform {
public:
Transform();
Transform(const Transform& other);
explicit Transform(uint32_t orientation, int w = 0, int h = 0);
~Transform();
enum RotationFlags : uint32_t {
ROT_0 = 0,
FLIP_H = 1, // HAL_TRANSFORM_FLIP_H
FLIP_V = 2, // HAL_TRANSFORM_FLIP_V
ROT_90 = 4, // HAL_TRANSFORM_ROT_90
ROT_180 = FLIP_H | FLIP_V,
ROT_270 = ROT_180 | ROT_90,
ROT_INVALID = 0x80
};
enum type_mask : uint32_t {
IDENTITY = 0,
TRANSLATE = 0x1,
ROTATE = 0x2,
SCALE = 0x4,
UNKNOWN = 0x8
};
// query the transform
bool preserveRects() const;
// Returns if bilinear filtering is needed after applying this transform to avoid aliasing.
bool needsBilinearFiltering() const;
uint32_t getType() const;
uint32_t getOrientation() const;
bool operator==(const Transform& other) const;
const vec3& operator [] (size_t i) const; // returns column i
float tx() const;
float ty() const;
float dsdx() const;
float dtdx() const;
float dtdy() const;
float dsdy() const;
float getScaleX() const;
float getScaleY() const;
// modify the transform
void reset();
void set(float tx, float ty);
void set(float a, float b, float c, float d);
status_t set(uint32_t flags, float w, float h);
void set(const std::array<float, 9>& matrix);
// transform data
Rect makeBounds(int w, int h) const;
vec2 transform(float x, float y) const;
Region transform(const Region& reg) const;
Rect transform(const Rect& bounds,
bool roundOutwards = false) const;
FloatRect transform(const FloatRect& bounds) const;
Transform& operator = (const Transform& other);
Transform operator * (const Transform& rhs) const;
Transform operator * (float value) const;
// assumes the last row is < 0 , 0 , 1 >
vec2 transform(const vec2& v) const;
vec3 transform(const vec3& v) const;
// Expands from the internal 3x3 matrix to an equivalent 4x4 matrix
mat4 asMatrix4() const;
Transform inverse() const;
// for debugging
void dump(std::string& result, const char* name, const char* prefix = "") const;
void dump(const char* name, const char* prefix = "") const;
static constexpr RotationFlags toRotationFlags(Rotation);
static constexpr Rotation toRotation(RotationFlags);
private:
struct mat33 {
vec3 v[3];
inline const vec3& operator [] (size_t i) const { return v[i]; }
inline vec3& operator [] (size_t i) { return v[i]; }
};
enum { UNKNOWN_TYPE = 0x80000000 };
uint32_t type() const;
static bool absIsOne(float f);
static bool isZero(float f);
mat33 mMatrix;
mutable uint32_t mType;
};
inline void PrintTo(const Transform& t, ::std::ostream* os) {
std::string out;
t.dump(out, "ui::Transform");
*os << out;
}
inline constexpr Transform::RotationFlags Transform::toRotationFlags(Rotation rotation) {
switch (rotation) {
case ROTATION_0:
return ROT_0;
case ROTATION_90:
return ROT_90;
case ROTATION_180:
return ROT_180;
case ROTATION_270:
return ROT_270;
default:
return ROT_INVALID;
}
}
inline constexpr Rotation Transform::toRotation(Transform::RotationFlags rotationFlags) {
switch (rotationFlags) {
case ROT_0:
return ROTATION_0;
case ROT_90:
return ROTATION_90;
case ROT_180:
return ROTATION_180;
case ROT_270:
return ROTATION_270;
default:
return ROTATION_0;
}
}
} // namespace ui
} // namespace android
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