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62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/**
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* Opaque per-instance state for a software pixel mapper, allocated by SoftwarePixelMapperCreateFn
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* and released by SoftwarePixelMapperDestroyFn. The instance owns its conversion destination
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* buffer: the driver passes this handle as map()'s dst argument.
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*/
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typedef void* SoftwarePixelMapperData;
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/**
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* Allocates a mapper instance, including its destination buffer, sized for a width x height
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* source buffer.
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* @param width source buffer width in pixels
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* @param height source buffer height in pixels
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* @return a non-null instance handle, or NULL on allocation failure
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*/
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typedef SoftwarePixelMapperData (*SoftwarePixelMapperCreateFn)(uint16_t width, uint16_t height);
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/**
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* Converts pixel_count pixels from the mapper's source format to its destination format.
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* @param data instance handle from SoftwarePixelMapperCreateFn
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* @param src RGB565 source pixels
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* @param dst destination buffer, typically the instance's own buffer (i.e. the data handle)
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* @param pixel_count number of pixels to convert
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*/
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typedef void (*SoftwarePixelMapperMapFn)(SoftwarePixelMapperData data, const uint16_t* src, uint8_t* dst, uint32_t pixel_count);
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/**
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* Releases a mapper instance created by SoftwarePixelMapperCreateFn, including its destination
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* buffer.
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* @param data instance handle to release
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*/
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typedef void (*SoftwarePixelMapperDestroyFn)(SoftwarePixelMapperData data);
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/**
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* A software pixel-format conversion, used to translate a driver's native source depth into a
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* panel's scan-out depth when the two differ. Each mapper owns its own destination buffer, so it
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* can size the allocation for its output format.
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*/
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struct SoftwarePixelMapper {
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SoftwarePixelMapperCreateFn create;
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SoftwarePixelMapperMapFn map;
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SoftwarePixelMapperDestroyFn destroy;
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};
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/**
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* RGB565 to packed 8-bit RGB332 (3 bits red, 3 bits green, 2 bits blue) mapper for panels wired
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* with only 8 data lines.
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*/
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extern const struct SoftwarePixelMapper software_pixel_mapper_rgb332;
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#ifdef __cplusplus
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}
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#endif
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