Merge "Added downsample()"

            int32_t destStartX, int32_t destStartY,

            const YUVImage &srcImage);

    // Downsamples the srcImage into the canvas' target image (mYUVImage)

    // The downsampling copies pixels from the source image starting at

    // (srcOffsetX, srcOffsetY) to the target image, starting at (0, 0).

    // For each X increment in the target image, skipX pixels are skipped

    // in the source image.

    // Similarly for each Y increment in the target image, skipY pixels

    // are skipped in the source image.

    void downsample(

            int32_t srcOffsetX, int32_t srcOffsetY,

            int32_t skipX, int32_t skipY,

            const YUVImage &srcImage);

private:

    YUVImage& mYUVImage;

#define LOG_NDEBUG 0

#define LOG_TAG "YUVCanvas"

#include <media/stagefright/MediaDebug.h>

#include <media/stagefright/YUVCanvas.h>

#include <media/stagefright/YUVImage.h>

#include <ui/Rect.h>

    }

}

void YUVCanvas::downsample(

        int32_t srcOffsetX, int32_t srcOffsetY,

        int32_t skipX, int32_t skipY,

        const YUVImage &srcImage) {

    // TODO: Add a low pass filter for downsampling.

    // Check that srcImage is big enough to fill mYUVImage.

    CHECK((srcOffsetX + (mYUVImage.width() - 1) * skipX) < srcImage.width());

    CHECK((srcOffsetY + (mYUVImage.height() - 1) * skipY) < srcImage.height());

    uint8_t yValue;

    uint8_t uValue;

    uint8_t vValue;

    int32_t srcY = srcOffsetY;

    for (int32_t y = 0; y < mYUVImage.height(); ++y) {

        int32_t srcX = srcOffsetX;

        for (int32_t x = 0; x < mYUVImage.width(); ++x) {

            srcImage.getPixelValue(srcX, srcY, &yValue, &uValue, &vValue);

            mYUVImage.setPixelValue(x, y, yValue, uValue, vValue);

            srcX += skipX;

        }

        srcY += skipY;

    }

}

}  // namespace android