HRESULT copy_pixels	(	UINT	bpp,
		const BYTE *	srcbuffer,
		UINT	srcwidth,
		UINT	srcheight,
		INT	srcstride,
		const WICRect *	rc,
		UINT	dststride,
		UINT	dstbuffersize,
		BYTE *	dstbuffer
	)

Definition at line 52 of file main.c.

Referenced by BmpFrameDecode_CopyPixels(), BmpFrameEncode_WritePixels(), GifFrameDecode_CopyPixels(), and IcoFrameDecode_CopyPixels().

{
    UINT bytesperrow;
    UINT row_offset; /* number of bits into the source rows where the data starts */

    if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
        return E_INVALIDARG;

    bytesperrow = ((bpp * rc->Width)+7)/8;

    if (dststride < bytesperrow)
        return E_INVALIDARG;

    if ((dststride * rc->Height) > dstbuffersize)
        return E_INVALIDARG;

    row_offset = rc->X * bpp;

    if (row_offset % 8 == 0)
    {
        /* everything lines up on a byte boundary */
        UINT row;
        const BYTE *src;
        BYTE *dst;

        src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
        dst = dstbuffer;
        for (row=0; row < rc->Height; row++)
        {
            memcpy(dst, src, bytesperrow);
            src += srcstride;
            dst += dststride;
        }
        return S_OK;
    }
    else
    {
        /* we have to do a weird bitwise copy. eww. */
        FIXME("cannot reliably copy bitmap data if bpp < 8\n");
        return E_FAIL;
    }
}

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