移植bot4cj
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package bot4cj.hd
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import ctype4cj.*
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const FBIOGET_VSCREENINFO = 0x4602u64
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const FBIOGET_FSCREENINFO = 0x4600u64
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const PROT_WRITE: C_Int = 0x2
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const MAP_SHARED: C_Int = 0x01
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/* --- 定义在I2C.cj里了 ---*/
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//foreign func ioctl(fd: C_Int, request: C_ULong, ...): C_Int
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/* ---- 内存映射 ---- */
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public type off_t = C_LongLong
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foreign func mmap(addr: CPointer<Unit>, length: UIntNative, prot: C_Int, flags: C_Int, fd: C_Int, offset: off_t): CPointer<Unit>
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/* -------- 打开framebuffer帧缓冲设备 -------- */
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@C
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public func fb_open(fb_dev: CString): C_Int {
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return unsafe { libc_open(fb_dev, O_RDWR) }
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}
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/* -------- 帧缓冲区固定参数 -------- */
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@C
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public struct fb_fix_screeninfo {
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var id: VArray<C_Char, $16> /* 设备驱动名称字符串，比如"TT Builtin" */
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var smem_start: C_ULong = 0 /* 帧缓冲内存（显存）的物理起始地址 */
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/* (physical address) */
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var smem_len: UInt32 = 0 /* 帧缓冲内存的总长度，单位字节 */
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var type_: UInt32 = 0 /* 显存类型（fb存储布局）see FB_TYPE_* */
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var type_aux: UInt32 = 0 /* 显存附加类型 */
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var visual: UInt32 = 0 /* 色彩显示模式 see FB_VISUAL_* */
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var xpanstep: UInt16 = 0 /* zero if no hardware panning */
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var ypanstep: UInt16 = 0 /* zero if no hardware panning */
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var ywrapstep: UInt16 = 0 /* zero if no hardware ywrap */
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var line_length: UInt32 = 0 /* 显示屏上一行像素数据所占用的字节数 */
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var mmio_start: C_ULong = 0 /* 内存映射I/O的物理起始地址 */
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/* (physical address) */
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var mmio_len: UInt32 = 0 /* 内存映射的区域长度，单位字节 */
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var accel: UInt32 = 0 /* 硬件加速类型 */
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/* specific chip/card we have */
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var capabilities: UInt16 = 0 /* see FB_CAP_* */
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var reserved: VArray<UInt16, $2> /* 保留字段，用于未来扩展，确保兼容 */
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public init() {
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id = VArray<C_Char, $16> (repeat: 0)
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reserved = VArray<UInt16, $2> (repeat: 0)
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}
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}
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/* 颜色字段偏移量的解释：所有偏移量均从右侧开始计算，
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* 位于一个“像素”值内部，该像素值的宽度正好等于 'bits_per_pixel'
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* （也就是说：你可以将偏移量作为 << 的右操作数使用）。
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* 之后的像素就是一个比特流，会原封不动地写入显存。
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*
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* 对于伪彩色：所有颜色分量的偏移量和长度应该相同。
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* 偏移量指定了调色板索引的最低有效位在像素值中的位置。
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* 长度表示可用的调色板条目数量（即条目数 = 1 << 长度）。
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*/
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@C
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public struct fb_bitfield {
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var offset: UInt32 = 0 /* 位域的起始位置（从右侧算起）*/
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var length: UInt32 = 0 /* 位域的长度（比特数） */
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var msb_right: UInt32 = 0 /* != 0 : 最高有效位在右侧 */
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/* （即低位在右） */
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}
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/* -------- 帧缓冲区可变参数 -------- */
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@C
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public struct fb_var_screeninfo {
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var xres: UInt32 = 0 /* visible resolution */
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var yres: UInt32 = 0
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var xres_virtual: UInt32 = 0 /* virtual resolution */
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var yres_virtual: UInt32 = 0
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var xoffset: UInt32 = 0 /* offset from virtual to visible */
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var yoffset: UInt32 = 0 /* resolution */
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var bits_per_pixel: UInt32 = 0 /* guess what */
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var grayscale: UInt32 = 0 /* 0 = color, 1 = grayscale, */
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/* >1 = FOURCC */
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var red: fb_bitfield /* bitfield in fb mem if true color, */
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var green: fb_bitfield /* else only length is significant */
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var blue: fb_bitfield
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var transp: fb_bitfield /* transparency */
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var nonstd: UInt32 = 0 /* != 0 Non standard pixel format */
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var activate: UInt32 = 0 /* see FB_ACTIVATE_* */
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var height: UInt32 = 0 /* height of picture in mm */
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var width: UInt32 = 0 /* width of picture in mm */
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var accel_flags: UInt32 = 0 /* (OBSOLETE) see fb_info.flags */
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/* Timing: All values in pixclocks, except pixclock (of course) */
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var pixclock: UInt32 = 0 /* pixel clock in ps (pico seconds) */
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var left_margin: UInt32 = 0 /* time from sync to picture */
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var right_margin: UInt32 = 0 /* time from picture to sync */
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var upper_margin: UInt32 = 0 /* time from sync to picture */
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var lower_margin: UInt32 = 0
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var hsync_len: UInt32 = 0 /* length of horizontal sync */
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var vsync_len: UInt32 = 0 /* length of vertical sync */
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var sync: UInt32 =0 /* see FB_SYNC_* */
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var vmode: UInt32 = 0 /* see FB_VMODE_* */
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var rotate: UInt32 = 0 /* angle we rotate counter clockwise */
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var colorspace: UInt32 = 0 /* colorspace for FOURCC-based modes */
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var reserved: VArray<UInt32, $4>/* Reserved for future compatibility */
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public init() {
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red = fb_bitfield()
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green = fb_bitfield()
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blue = fb_bitfield()
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transp = fb_bitfield()
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reserved = VArray<UInt32, $4> (repeat: 0)
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}
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}
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/* ---- 获取帧缓冲区可变参数 ---- */
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@C
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public func fb_get_var_info(fd: C_Int) {
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var info = fb_var_screeninfo()
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unsafe { ioctl(fd, FBIOGET_VSCREENINFO, inout info) }
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return info
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}
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/* ---- 获取帧缓冲区固定参数 ---- */
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@C
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public func fb_get_fix_info(fd: C_Int) {
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var info = fb_fix_screeninfo()
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unsafe { ioctl(fd, FBIOGET_FSCREENINFO, inout info) }
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return info
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}
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/* ---- 内存映射 ---- */
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@C
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public func fb_mmap(addr: CPointer<Unit>, length: UIntNative, fd: C_Int, offset: off_t): CPointer<Unit>
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{
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let buf = unsafe { mmap(addr, length, PROT_WRITE, MAP_SHARED, fd, offset) }
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return buf
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}
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