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#ifndef RENDER_PIXEL_FORMAT_H
#define RENDER_PIXEL_FORMAT_H
#include <wayland-server-protocol.h>
/**
* Information about a pixel format.
*
* A pixel format is identified via its DRM four character code (see <drm_fourcc.h>).
*
* Simple formats have a block size of 1×1 pixels and bytes_per_block contains
* the number of bytes per pixel (including padding).
*
* Tiled formats (e.g. sub-sampled YCbCr) are described with a block size
* greater than 1×1 pixels. A block is a rectangle of pixels which are stored
* next to each other in a byte-aligned memory region.
*/
struct wlr_pixel_format_info {
uint32_t drm_format;
/* Equivalent of the format if it has an alpha channel,
* DRM_FORMAT_INVALID (0) if NA
*/
uint32_t opaque_substitute;
/* Bytes per block (including padding) */
uint32_t bytes_per_block;
/* Size of a block in pixels (zero for 1×1) */
uint32_t block_width, block_height;
};
/**
* Get pixel format information from a DRM FourCC.
*
* NULL is returned if the pixel format is unknown.
*/
const struct wlr_pixel_format_info *drm_get_pixel_format_info(uint32_t fmt);
/**
* Get the number of pixels per block for a pixel format.
*/
uint32_t pixel_format_info_pixels_per_block(const struct wlr_pixel_format_info *info);
/**
* Get the minimum stride for a given pixel format and width.
*/
int32_t pixel_format_info_min_stride(const struct wlr_pixel_format_info *info, int32_t width);
/**
* Check whether a stride is large enough for a given pixel format and width.
*/
bool pixel_format_info_check_stride(const struct wlr_pixel_format_info *info,
int32_t stride, int32_t width);
/**
* Convert an enum wl_shm_format to a DRM FourCC.
*/
uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt);
/**
* Convert a DRM FourCC to an enum wl_shm_format.
*/
enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt);
/**
* Return true if the DRM FourCC fmt has an alpha channel, false otherwise.
*/
bool pixel_format_has_alpha(uint32_t fmt);
#endif
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