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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SKHITBOX_H_
#define SKHITBOX_H_
#include "SkBitmap.h"
#include "SkUnPreMultiply.h"
/* NOTE(chudy): It's possible that this class can be entirely static similar to
* SkObjectParser. We will have to pass in the fHitBox void * every call.
*/
class SkHitBox {
public:
SkHitBox();
~SkHitBox();
/**
Allocates enough space in memory for our hitbox pointer to contain
a layer value for every pixel. Initializes every value to 0.
*/
void alloc(int width, int height);
/**
Compares the new SkBitmap compared to the SkBitmap from the last
call. Updates our hitbox with the draw command number if different.
*/
void updateHitBox(SkBitmap* newBitmap, int layer);
/**
Compares point x,y in the new bitmap compared to the saved previous
one. Updates hitpoint with the draw command number if different.
*/
void updateHitPoint(SkBitmap* newBitmap, int layer);
/**
Sets the target hitpoint we are attempting to find the layer of.
*/
void setHitPoint(int x, int y) {
fX = x;
fY = y;
fLayer = 0;
}
/**
Returns a pointer to the start of the hitbox.
*/
int* getHitBox() {
return fHitBox;
}
/**
Returns the layer numbr corresponding to the point (fX, fY) in this class.
*/
int getPoint() {
return fLayer;
}
/**
Checks to see if a mouse click has been passed in.
*/
bool pointIsSet() {
return !(fX == -1 && fY == -1);
}
private:
SkBitmap fPrev;
int* fHitBox;
int fX;
int fY;
int fLayer;
};
#endif /* SKHITBOX_H_ */
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