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/*
* Copyright 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 IMAGE_CODEC_BMPDECODERHELPER_H__
#define IMAGE_CODEC_BMPDECODERHELPER_H__
///////////////////////////////////////////////////////////////////////////////
// this section is my current "glue" between google3 code and android.
// will be fixed soon
#include "SkTypes.h"
#include <limits.h>
#define DISALLOW_EVIL_CONSTRUCTORS(name)
#define CHECK(predicate) SkASSERT(predicate)
typedef uint8_t uint8;
typedef uint32_t uint32;
template <typename T> class scoped_array {
private:
T* ptr_;
scoped_array(scoped_array const&);
scoped_array& operator=(const scoped_array&);
public:
explicit scoped_array(T* p = 0) : ptr_(p) {}
~scoped_array() {
delete[] ptr_;
}
void reset(T* p = 0) {
if (p != ptr_) {
delete[] ptr_;
ptr_ = p;
}
}
T& operator[](int i) const {
return ptr_[i];
}
};
///////////////////////////////////////////////////////////////////////////////
namespace image_codec {
class BmpDecoderCallback {
public:
BmpDecoderCallback() { }
virtual ~BmpDecoderCallback() {}
/**
* This is called once for an image. It is passed the width and height and
* should return the address of a buffer that is large enough to store
* all of the resulting pixels (widht * height * 3 bytes). If it returns NULL,
* then the decoder will abort, but return true, as the caller has received
* valid dimensions.
*/
virtual uint8* SetSize(int width, int height) = 0;
private:
DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderCallback);
};
class BmpDecoderHelper {
public:
BmpDecoderHelper() { }
~BmpDecoderHelper() { }
bool DecodeImage(const char* data,
int len,
int max_pixels,
BmpDecoderCallback* callback);
private:
DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderHelper);
void DoRLEDecode();
void DoStandardDecode();
void PutPixel(int x, int y, uint8 col);
int GetInt();
int GetShort();
uint8 GetByte();
int CalcShiftRight(uint32 mask);
int CalcShiftLeft(uint32 mask);
const uint8* data_;
int pos_;
int len_;
int width_;
int height_;
int bpp_;
int pixelPad_;
int rowPad_;
scoped_array<uint8> colTab_;
uint32 redBits_;
uint32 greenBits_;
uint32 blueBits_;
int redShiftRight_;
int greenShiftRight_;
int blueShiftRight_;
int redShiftLeft_;
int greenShiftLeft_;
int blueShiftLeft_;
uint8* output_;
bool inverted_;
};
} // namespace
#endif
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