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