VkPresentRegionKHR

For a given image and swapchain, the region to present is specified by the VkPresentRegionKHR structure, which is defined as:

typedef struct VkPresentRegionKHR {
    uint32_t rectangleCount;
    const VkRectLayerKHR* pRectangles;
} VkPresentRegionKHR;

• rectangleCount is the number of rectangles in pRectangles, or zero if the entire image has changed and should be presented.
• pRectangles is either NULL or a pointer to an array of VkRectLayerKHR structures. The VkRectLayerKHR structure is the framebuffer coordinates, plus layer, of a portion of a presentable image that has changed and must be presented. If non-NULL, each entry in pRectangles is a rectangle of the given image that has changed since the last image was presented to the given swapchain. The rectangles must be specified relative to VkSurfaceCapabilitiesKHR::currentTransform, regardless of the swapchain’s preTransform. The presentation engine will apply the preTransform transformation to the rectangles, along with any further transformation it applies to the image content.