MultiBandSingleGandGray, // a layer containing 2 or more bands, but a single band drawn as a range of gray colors

//added in 1.6 to fix naming glitch

MultiBandSingleBandGray = MultiBandSingleGandGray, // a layer containing 2 or more bands, but a single band drawn as a range of gray colors

class CORE_EXPORT QgsRasterImageBuffer

{

public:

QgsRasterImageBuffer( QgsRasterDataProvider *dataProvider, int bandNo, QPainter* p,

QgsRasterViewPort* viewPort, const QgsMapToPixel* mapToPixel, double* mGeoTransform );

~QgsRasterImageBuffer();

void reset( int maxPixelsInVirtualMemory = 5000000 );

/**Returns a pointer to the next scan line (or 0 if end)*/

bool nextScanLine( QRgb** imageScanLine, void** rasterScanLine );

void setWritingEnabled( bool enabled ) { mWritingEnabled = enabled; }

private:

QgsRasterImageBuffer(); //forbidden

/**Creates next part image. Returns false if at end*/

bool createNextPartImage();

/**Peter's fix for zoomed in rasters*/

void drawPixelRectangle();

QgsRasterDataProvider* mDataProvider;

int mBandNo;

QPainter* mPainter;

QgsRasterViewPort* mViewPort;

const QgsMapToPixel* mMapToPixel;

double* mGeoTransform;

bool mValid;

/**True (default), if values are written to an image. If false, the class only reads the values, but does not create an image*/

bool mWritingEnabled;

/**Draws the raster pixels as rectangles. This is only used if the map units per pixel is very, very small*/

bool mDrawPixelRect;

int mCurrentRow;

int mNumPartImages; //number of part images

int mNumRasterRowsPerPart; //number of (raster source) rows per part

int mCurrentPartRasterMin; //minimum (raster source) row of current image

int mCurrentPartRasterMax; //maximum (raster source) row of current image

int mCurrentPartImageRow; //current image row

int mNumCurrentImageRows; //number of image rows for the current part

int mCurrentPart;

//current memory image and gdal scan data

QImage* mCurrentImage;

void* mCurrentGDALData;

};