/*
* 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.
*/
#ifndef ANDROID_UI_REGION_H
#define ANDROID_UI_REGION_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/Vector.h>
#include <ui/Rect.h>
#include <hardware/copybit.h>
namespace android {
// ---------------------------------------------------------------------------
class String8;
// ---------------------------------------------------------------------------
class Region
{
public:
Region();
Region(const Region& rhs);
explicit Region(const Rect& rhs);
explicit Region(const void* buffer);
~Region();
Region& operator = (const Region& rhs);
inline bool isEmpty() const { return mBounds.isEmpty(); }
inline bool isRect() const { return mStorage.isEmpty(); }
inline Rect getBounds() const { return mBounds; }
inline Rect bounds() const { return getBounds(); }
// the region becomes its bounds
Region& makeBoundsSelf();
void clear();
void set(const Rect& r);
void set(uint32_t w, uint32_t h);
Region& orSelf(const Rect& rhs);
Region& andSelf(const Rect& rhs);
Region& subtractSelf(const Rect& rhs);
// boolean operators, applied on this
Region& orSelf(const Region& rhs);
Region& andSelf(const Region& rhs);
Region& subtractSelf(const Region& rhs);
// boolean operators
const Region merge(const Rect& rhs) const;
const Region intersect(const Rect& rhs) const;
const Region subtract(const Rect& rhs) const;
// boolean operators
const Region merge(const Region& rhs) const;
const Region intersect(const Region& rhs) const;
const Region subtract(const Region& rhs) const;
// these translate rhs first
Region& translateSelf(int dx, int dy);
Region& orSelf(const Region& rhs, int dx, int dy);
Region& andSelf(const Region& rhs, int dx, int dy);
Region& subtractSelf(const Region& rhs, int dx, int dy);
// these translate rhs first
const Region translate(int dx, int dy) const;
const Region merge(const Region& rhs, int dx, int dy) const;
const Region intersect(const Region& rhs, int dx, int dy) const;
const Region subtract(const Region& rhs, int dx, int dy) const;
// convenience operators overloads
inline const Region operator | (const Region& rhs) const;
inline const Region operator & (const Region& rhs) const;
inline const Region operator - (const Region& rhs) const;
inline const Region operator + (const Point& pt) const;
inline Region& operator |= (const Region& rhs);
inline Region& operator &= (const Region& rhs);
inline Region& operator -= (const Region& rhs);
inline Region& operator += (const Point& pt);
/* various ways to access the rectangle list */
typedef Rect const* const_iterator;
const_iterator begin() const;
const_iterator end() const;
/* no user serviceable parts here... */
size_t getRects(Vector<Rect>& rectList) const;
Rect const* getArray(size_t* count) const;
// add a rectangle to the internal list. This rectangle must
// be sorted in Y and X and must not make the region invalid.
void addRectUnchecked(int l, int t, int r, int b);
// flatten/unflatten a region to/from a raw buffer
ssize_t write(void* buffer, size_t size) const;
static ssize_t writeEmpty(void* buffer, size_t size);
ssize_t read(const void* buffer);
static bool isEmpty(void* buffer);
void dump(String8& out, const char* what, uint32_t flags=0) const;
void dump(const char* what, uint32_t flags=0) const;
private:
class rasterizer;
friend class rasterizer;
Region& operationSelf(const Rect& r, int op);
Region& operationSelf(const Region& r, int op);
Region& operationSelf(const Region& r, int dx, int dy, int op);
const Region operation(const Rect& rhs, int op) const;
const Region operation(const Region& rhs, int op) const;
const Region operation(const Region& rhs, int dx, int dy, int op) const;
static void boolean_operation(int op, Region& dst,
const Region& lhs, const Region& rhs, int dx, int dy);
static void boolean_operation(int op, Region& dst,
const Region& lhs, const Rect& rhs, int dx, int dy);
static void boolean_operation(int op, Region& dst,
const Region& lhs, const Region& rhs);
static void boolean_operation(int op, Region& dst,
const Region& lhs, const Rect& rhs);
static void translate(Region& reg, int dx, int dy);
static void translate(Region& dst, const Region& reg, int dx, int dy);
static bool validate(const Region& reg, const char* name);
Rect mBounds;
Vector<Rect> mStorage;
};
const Region Region::operator | (const Region& rhs) const {
return merge(rhs);
}
const Region Region::operator & (const Region& rhs) const {
return intersect(rhs);
}
const Region Region::operator - (const Region& rhs) const {
return subtract(rhs);
}
const Region Region::operator + (const Point& pt) const {
return translate(pt.x, pt.y);
}
Region& Region::operator |= (const Region& rhs) {
return orSelf(rhs);
}
Region& Region::operator &= (const Region& rhs) {
return andSelf(rhs);
}
Region& Region::operator -= (const Region& rhs) {
return subtractSelf(rhs);
}
Region& Region::operator += (const Point& pt) {
return translateSelf(pt.x, pt.y);
}
// ---------------------------------------------------------------------------
struct region_iterator : public copybit_region_t {
region_iterator(const Region& region)
: b(region.begin()), e(region.end()) {
this->next = iterate;
}
private:
static int iterate(copybit_region_t const * self, copybit_rect_t* rect) {
region_iterator const* me = static_cast<region_iterator const*>(self);
if (me->b != me->e) {
*reinterpret_cast<Rect*>(rect) = *me->b++;
return 1;
}
return 0;
}
mutable Region::const_iterator b;
Region::const_iterator const e;
};
// ---------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_UI_REGION_H