|| || || || || ||

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LimitCompressedImageSize.h

Go to the documentation of this file.

#ifndef Impala_Core_Array_LimitCompressedImageSize_h
#define Impala_Core_Array_LimitCompressedImageSize_h

#include "Basis/ILog.h"
#include "Core/Array/Arrays.h"
#include "Core/Array/MakeFromData.h"
#include "Core/Array/ReadImage.h"
#include "Core/Array/Scale.h"
#include "Core/Array/WritePng.h"

namespace Impala
{
namespace Core
{
namespace Array
{


inline void
LimitCompressedImageSize(Array2dScalarUInt8*& bufIm, int maxSize)
{
    ILOG_VAR(Impala.Core.Array.LimitCompressedImageSize);

    if (maxSize <= 0)
        return;

    Array2dVec3UInt8* rgbIm = 0;
    ReadImageFromMemory(rgbIm, (char*)bufIm->CPB(), bufIm->CW());
    if (!rgbIm)
        return;

    if ((rgbIm->CW() > maxSize) || (rgbIm->CH() > maxSize))
    {
        double scale = 1.0;
        while ((scale * rgbIm->CW() > maxSize) || (scale * rgbIm->CH() > maxSize))
            scale *= 0.5;

        size_t nrBytes = 0;
        Array2dVec3UInt8* sc = 0;
        Scale(sc, rgbIm, scale, scale, Core::Geometry::NEAREST, true);
        int charBufSize = sc->CW() * sc->CH() * 3 + 1024;
        char* charBuf = new char[charBufSize];    
        WritePngToMemory(sc, charBuf, charBufSize, &nrBytes);
        delete sc;

        delete bufIm;
        bufIm = MakeFromData<Array2dScalarUInt8>((UInt8*) charBuf, nrBytes, 1);
        delete charBuf;
    }
    delete rgbIm;
}

} // namespace Array
} // namespace Core
} // namespace Impala

#endif

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