/*
 *  MagickBitmapSource.cpp
 *  zxing
 *
 *  Created by Ralf Kistner on 16/10/2009.
 *  Copyright 2008 ZXing authors All rights reserved.
 *
 * 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.
 */

#include "MagickBitmapSource.h"

#include <iostream>

using namespace Magick;

MagickBitmapSource::MagickBitmapSource(Image& image) : image_(image) {
  width = image.columns();
  height = image.rows();

  pixel_cache = image.getConstPixels(0, 0, width, height);
}

MagickBitmapSource::~MagickBitmapSource() {

}

int MagickBitmapSource::getWidth() {
  return width;
}

int MagickBitmapSource::getHeight() {
  return height;
}

unsigned char MagickBitmapSource::getPixel(int x, int y) {
  const PixelPacket* p = pixel_cache + y * width + x;
  // We assume 16 bit values here

  //return (unsigned char)((((int)p->red + (int)p->green + (int)p->blue) >> 8) / 3);

  return (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) + 117 * ((int)p->blue >> 8)) >> 10);
}

/** This is a more efficient implementation. */
unsigned char* MagickBitmapSource::copyMatrix() {
  int width = getWidth();
  int height =  getHeight();
  unsigned char* matrix = new unsigned char[width*height];
  unsigned char* m = matrix;
  const Magick::PixelPacket* p = pixel_cache;
  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
      *m = (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) + 117 * ((int)p->blue >> 8)) >> 10);
      m++;
      p++;
    }
  }
  return matrix;
}