C++ (Cpp) Canvas::AlphaBlend Examples

Example #1

File: TransparentRendererCache.cpp Project: Turbo87/XCSoar-TE

void
TransparentRendererCache::AlphaBlendTo(Canvas &canvas,
                                       const WindowProjection &projection,
                                       uint8_t alpha) const
{
    assert(canvas.IsDefined());
    assert(buffer.IsDefined());
    assert(projection.IsValid());
    assert(compare_projection.IsDefined());
    assert(Check(projection));

    if (empty)
        return;

    const unsigned width = projection.GetScreenWidth(),
                   height = projection.GetScreenHeight();

#ifdef USE_MEMORY_CANVAS
    canvas.AlphaBlendNotWhite(0, 0, width, height,
                              buffer, 0, 0, width, height,
                              alpha);
#else
    canvas.AlphaBlend(0, 0, width, height,
                      buffer, 0, 0, width, height,
                      alpha);
#endif
}