PREVIEW_OUTPUT_MEMORY
if (prev->output & PREVIEW_OUTPUT_MEMORY)
if (prev->output & PREVIEW_OUTPUT_MEMORY)
if (prev->output & PREVIEW_OUTPUT_MEMORY) {
prev->output & PREVIEW_OUTPUT_MEMORY)
if (prev->output & PREVIEW_OUTPUT_MEMORY)
!(prev->output & PREVIEW_OUTPUT_MEMORY))
if (prev->output & PREVIEW_OUTPUT_MEMORY)
if (prev->output & ~PREVIEW_OUTPUT_MEMORY)
prev->output |= PREVIEW_OUTPUT_MEMORY;
prev->output &= ~PREVIEW_OUTPUT_MEMORY;