mirror of
https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2024-11-29 02:22:20 +00:00
96f3f3c92e
Some formats like sub-sampled YCbCr use a block of bytes to store the color values for more than one pixel. Update our format table to be able to handle such formats.
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
#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;
|
||
|
||
/* True if the format has an alpha channel */
|
||
bool has_alpha;
|
||
};
|
||
|
||
/**
|
||
* 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);
|
||
|
||
#endif
|