AST_MAX_HWC_WIDTH
if (new_fb->width > AST_MAX_HWC_WIDTH || new_fb->height > AST_MAX_HWC_HEIGHT)
offset_x = AST_MAX_HWC_WIDTH - fb->width;
unsigned int trailing_bytes = (AST_MAX_HWC_WIDTH - width) * sizeof(u16);
#define AST_HWC_PITCH (AST_MAX_HWC_WIDTH * SZ_2)