mirror of
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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2024 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_LG_COMMON_FRAMEBUFFER_
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#define _H_LG_COMMON_FRAMEBUFFER_
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdatomic.h>
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#define FB_CHUNK_SIZE 1048576 // 1MB
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#define FB_SPIN_LIMIT 10000 // 10ms
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#define FB_WP_TYPE atomic_uint_least32_t
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#define FB_WP_SIZE sizeof(FB_WP_TYPE)
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typedef struct stFrameBuffer
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{
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FB_WP_TYPE wp;
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uint8_t data[0];
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} FrameBuffer;
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typedef bool (*FrameBufferReadFn)(void * opaque, const void * src, size_t size);
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/**
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* Wait for the framebuffer to fill to the specified size
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*/
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bool framebuffer_wait(const FrameBuffer * frame, size_t size);
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/**
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* Read `size` bytes from the KVMFRFrame into the dst buffer
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*/
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bool framebuffer_read_linear(const FrameBuffer * frame, void * restrict dst,
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size_t size);
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/**
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* Read data from the KVMFRFrame into the dst buffer
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*/
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bool framebuffer_read(const FrameBuffer * frame, void * dst, size_t dstpitch,
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size_t height, size_t width, size_t bpp, size_t pitch);
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/**
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* Read data from the KVMFRFrame using a callback
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*/
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bool framebuffer_read_fn(const FrameBuffer * frame, size_t height, size_t width,
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size_t bpp, size_t pitch, FrameBufferReadFn fn, void * opaque);
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/**
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* Prepare the framebuffer for writing
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*/
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void framebuffer_prepare(FrameBuffer * frame);
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/**
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* Write data from the src buffer into the KVMFRFrame
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*/
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extern bool (*framebuffer_write)(FrameBuffer * frame,
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const void * restrict src, size_t size);
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/**
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* Gets the underlying data buffer of the framebuffer.
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* For custom read routines only.
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*/
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const uint8_t * framebuffer_get_buffer(const FrameBuffer * frame);
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/**
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* Gets the underlying data buffer of the framebuffer.
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* For custom write routines only.
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*/
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uint8_t * framebuffer_get_data(FrameBuffer * frame);
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/**
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* Sets the write pointer of the framebuffer.
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* For custom write routines only.
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*/
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void framebuffer_set_write_ptr(FrameBuffer * frame, size_t size);
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#endif
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