C++ image::BitmapData类代码示例

    void paint (Graphics& g)
    {
        if (colours.isNull())
        {
            const int width = getWidth() / 2;
            const int height = getHeight() / 2;
            colours = Image (Image::RGB, width, height, false);

            Image::BitmapData pixels (colours, Image::BitmapData::writeOnly);

            for (int y = 0; y < height; ++y)
            {
                const float val = 1.0f - y / (float) height;

                for (int x = 0; x < width; ++x)
                {
                    const float sat = x / (float) width;

                    pixels.setPixelColour (x, y, Colour (h, sat, val, 1.0f));
                }
            }
        }

        g.setOpacity (1.0f);
        g.drawImage (colours, edge, edge, getWidth() - edge * 2, getHeight() - edge * 2,
                     0, 0, colours.getWidth(), colours.getHeight());
    }

//==============================================================================
void LowLevelGraphicsPostScriptRenderer::writeImage (const Image& im,
                                                     const int sx, const int sy,
                                                     const int maxW, const int maxH) const
{
    out << "{<\n";

    const int w = jmin (maxW, im.getWidth());
    const int h = jmin (maxH, im.getHeight());

    int charsOnLine = 0;
    const Image::BitmapData srcData (im, 0, 0, w, h);
    Colour pixel;

    for (int y = h; --y >= 0;)
    {
        for (int x = 0; x < w; ++x)
        {
            const uint8* pixelData = srcData.getPixelPointer (x, y);

            if (x >= sx && y >= sy)
            {
                if (im.isARGB())
                {
                    PixelARGB p (*(const PixelARGB*) pixelData);
                    p.unpremultiply();
                    pixel = Colours::white.overlaidWith (Colour (p.getARGB()));
                }
                else if (im.isRGB())
                {
                    pixel = Colour (((const PixelRGB*) pixelData)->getARGB());
                }
                else
                {
                    pixel = Colour ((uint8) 0, (uint8) 0, (uint8) 0, *pixelData);
                }
            }
            else
            {
                pixel = Colours::transparentWhite;
            }

            const uint8 pixelValues[3] = { pixel.getRed(), pixel.getGreen(), pixel.getBlue() };

            out << String::toHexString (pixelValues, 3, 0);
            charsOnLine += 3;

            if (charsOnLine > 100)
            {
                out << '\n';
                charsOnLine = 0;
            }
        }
    }

    out << "\n>}\n";
}

    void handleFrame (double /*time*/, BYTE* buffer, long /*bufferSize*/)
    {
        if (recordNextFrameTime)
        {
            const double defaultCameraLatency = 0.1;

            firstRecordedTime = Time::getCurrentTime() - RelativeTime (defaultCameraLatency);
            recordNextFrameTime = false;

            ComSmartPtr<IPin> pin;
            if (getPin (filter, PINDIR_OUTPUT, pin))
            {
                ComSmartPtr<IAMPushSource> pushSource;
                HRESULT hr = pin.QueryInterface (pushSource);

                if (pushSource != nullptr)
                {
                    REFERENCE_TIME latency = 0;
                    hr = pushSource->GetLatency (&latency);

                    firstRecordedTime = firstRecordedTime - RelativeTime ((double) latency);
                }
            }
        }

        {
            const int lineStride = width * 3;
            const ScopedLock sl (imageSwapLock);

            {
                loadingImage.duplicateIfShared();
                const Image::BitmapData destData (loadingImage, 0, 0, width, height, Image::BitmapData::writeOnly);

                for (int i = 0; i < height; ++i)
                    memcpy (destData.getLinePointer ((height - 1) - i),
                            buffer + lineStride * i,
                            lineStride);
            }

            imageNeedsFlipping = true;
        }

        if (listeners.size() > 0)
            callListeners (loadingImage);

        sendChangeMessage();
    }

Image ImageType::convert (const Image& source) const
{
    if (source.isNull() || getTypeID() == (ScopedPointer<ImageType> (source.getPixelData()->createType())->getTypeID()))
        return source;

    const Image::BitmapData src (source, Image::BitmapData::readOnly);

    Image newImage (create (src.pixelFormat, src.width, src.height, false));
    Image::BitmapData dest (newImage, Image::BitmapData::writeOnly);

    jassert (src.pixelStride == dest.pixelStride && src.pixelFormat == dest.pixelFormat);

    for (int y = 0; y < dest.height; ++y)
        memcpy (dest.getLinePointer (y), src.getLinePointer (y), (size_t) dest.lineStride);

    return newImage;
}

Image ImageType::convert (const Image& source) const
{
    if (source.isNull() || getTypeID() == (std::unique_ptr<ImageType> (source.getPixelData()->createType())->getTypeID()))
        return source;

    const Image::BitmapData src (source, Image::BitmapData::readOnly);

    Image newImage (create (src.pixelFormat, src.width, src.height, false));
    Image::BitmapData dest (newImage, Image::BitmapData::writeOnly);

    if (src.pixelStride == dest.pixelStride && src.pixelFormat == dest.pixelFormat)
    {
        for (int y = 0; y < dest.height; ++y)
            memcpy (dest.getLinePointer (y), src.getLinePointer (y), (size_t) dest.lineStride);
    }
    else
    {
        for (int y = 0; y < dest.height; ++y)
            for (int x = 0; x < dest.width; ++x)
                dest.setPixelColour (x, y, src.getPixelColour (x, y));
    }

    return newImage;
}

//==============================================================================
void ImageConvolutionKernel::applyToImage (Image& destImage,
                                           const Image& sourceImage,
                                           const Rectangle<int>& destinationArea) const
{
    if (sourceImage == destImage)
    {
        destImage.duplicateIfShared();
    }
    else
    {
        if (sourceImage.getWidth() != destImage.getWidth()
             || sourceImage.getHeight() != destImage.getHeight()
             || sourceImage.getFormat() != destImage.getFormat())
        {
            jassertfalse;
            return;
        }
    }

    const Rectangle<int> area (destinationArea.getIntersection (destImage.getBounds()));

    if (area.isEmpty())
        return;

    const int right = area.getRight();
    const int bottom = area.getBottom();

    const Image::BitmapData destData (destImage, area.getX(), area.getY(), area.getWidth(), area.getHeight(), true);
    uint8* line = destData.data;

    const Image::BitmapData srcData (sourceImage, false);

    if (destData.pixelStride == 4)
    {
        for (int y = area.getY(); y < bottom; ++y)
        {
            uint8* dest = line;
            line += destData.lineStride;

            for (int x = area.getX(); x < right; ++x)
            {
                float c1 = 0;
                float c2 = 0;
                float c3 = 0;
                float c4 = 0;

                for (int yy = 0; yy < size; ++yy)
                {
                    const int sy = y + yy - (size >> 1);

                    if (sy >= srcData.height)
                        break;

                    if (sy >= 0)
                    {
                        int sx = x - (size >> 1);
                        const uint8* src = srcData.getPixelPointer (sx, sy);

                        for (int xx = 0; xx < size; ++xx)
                        {
                            if (sx >= srcData.width)
                                break;

                            if (sx >= 0)
                            {
                                const float kernelMult = values [xx + yy * size];
                                c1 += kernelMult * *src++;
                                c2 += kernelMult * *src++;
                                c3 += kernelMult * *src++;
                                c4 += kernelMult * *src++;
                            }
                            else
                            {
                                src += 4;
                            }

                            ++sx;
                        }
                    }
                }

                *dest++ = (uint8) jmin (0xff, roundToInt (c1));
                *dest++ = (uint8) jmin (0xff, roundToInt (c2));
                *dest++ = (uint8) jmin (0xff, roundToInt (c3));
                *dest++ = (uint8) jmin (0xff, roundToInt (c4));
            }
        }
    }

Image RadialImageConvolutionKernel::createConvolvedImageFull (Image const& sourceImage) const
{
  // calc destination size based on kernel radius
  int dw = sourceImage.getWidth() + 2 * m_radius - 1;
  int dh = sourceImage.getHeight() + 2 * m_radius - 1;
  Image result (sourceImage.getFormat(), dw, dh, false);

  // calc size of edge-replicated source dimensions
  int sw = dw + 2 * m_radius - 1;
  int sh = dh + 2 * m_radius - 1;

  // temp buffer is big enough for the largest edge-replicated line
  HeapBlock <uint8> temp;
  temp.allocate (jmax (sw, sh), false);

  const Image::BitmapData srcData (sourceImage,
                                            Image::BitmapData::readOnly);

  const Image::BitmapData destData (result, 0, 0, dw, dh,
                                             Image::BitmapData::readWrite);

  int ci[4];
  int nc = srcData.pixelStride;
  bool alpha = false;

  switch (srcData.pixelFormat)
  {
  case Image::RGB:
    ci[0] = PixelRGB::indexR;
    ci[1] = PixelRGB::indexG;
    ci[2] = PixelRGB::indexB;
    nc = 3;
    alpha = false;
    break;

  case Image::ARGB:
    ci[0] = PixelARGB::indexR;
    ci[1] = PixelARGB::indexG;
    ci[2] = PixelARGB::indexB;
    ci[3] = PixelARGB::indexA;
    nc = 3;
    alpha = true;
    break;

  case Image::SingleChannel:
    ci[0] = 0;
    nc = 0;
    alpha = true;
    break;

  default:
    Throw (Error ().fail (__FILE__, __LINE__));
    break;
  }

  // edge-replicate each row in source to temp, and convolve into dest
  for (int y = 0; y < srcData.height; ++y)
  {
    for (int c = 0; c < nc; ++c)
    {
      copy (srcData.width,
            temp,
            1,
            srcData.getLinePointer (y) + ci[c],
            srcData.pixelStride,
            2 * (m_radius - 1));

      convolve (destData.width,
                destData.getPixelPointer (0, y + m_radius - 1) + ci[c],
                destData.pixelStride,
                temp,
                1,
                m_radius,
                m_kernel);
    }

    if (alpha)
    {
      copy_alpha (srcData.width,
                  temp,
                  1,
                  srcData.getLinePointer (y) + ci[nc],
                  srcData.pixelStride,
                  2 * (m_radius - 1));

      convolve (destData.width,
                destData.getPixelPointer (0, y + m_radius - 1) + ci[nc],
                destData.pixelStride,
                temp,
                1,
                m_radius,
                m_kernel);
    }
  }

  // edge-replicate each intermediate column from dest to temp, and convolve into dest
  for (int x = 0; x < destData.width; ++x)
  {
    for (int c = 0; c < nc; ++c)
    {
//.........这里部分代码省略.........