130 lines
4.0 KiB
C
130 lines
4.0 KiB
C
/** \file server/drivers/glcd-low.h
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* Interface to low level code to access graphical displays.
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*
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* \note This file should not include hardware dependent header files (libusb,
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* libftdi, libhid, etc.) Those shall be included by the sub drivers.
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*/
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#ifndef GLCD_LOW_H
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#define GLCD_LOW_H
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#define GLCD_DEFAULT_SIZE "128x64"
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#define GLCD_DEFAULT_CELLWIDTH 6
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#define GLCD_DEFAULT_CELLHEIGHT 8
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#define GLCD_MAX_WIDTH 640
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#define GLCD_MAX_HEIGHT 480
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#define GLCD_DEFAULT_CONTRAST 600
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#define GLCD_DEFAULT_BRIGHTNESS 800
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#define GLCD_DEFAULT_OFFBRIGHTNESS 100
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/** The framebuffer and its properties */
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struct glcd_framebuf {
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unsigned char *data; /**< frame buffer */
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int px_width; /**< display width in dots */
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int px_height; /**< display height in dots */
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int bytesPerLine; /**< number of bytes per pixel row */
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};
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/** private data for the \c glcd driver */
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typedef struct glcd_private_data {
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struct glcd_framebuf framebuf; /**< the main framebuffer */
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int cellwidth; /**< character cell width */
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int cellheight; /**< character cell height */
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int width; /**< display width in characters */
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int height; /**< display height in characters */
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int contrast; /**< current contrast */
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int brightness; /**< current brightness (for backlight on) */
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int offbrightness; /**< current brightness (for backlight off) */
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int last_output_state; /**< cache last value to output() */
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int backlightstate; /**< state of backlight currently used */
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struct hwDependentFns *glcd_functions; /**< pointers to low-level functions */
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void *ct_data; /**< Connection type specific data */
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void *render_config; /**< Settings for the font renderer */
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char use_ft2; /**< (Not) use FreeType if available */
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} PrivateData;
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/** Structure holding pointers to display specific functions */
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typedef struct hwDependentFns {
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/* report and debug helper. Set by global glcd init */
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void (*drv_report)(const int level, const char *format,... /* args */ );
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void (*drv_debug)(const int level, const char *format,... /* args */ );
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/* Transfer the framebuffer to the display */
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void (*blit)(PrivateData *p);
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/* Switch the backlight on or off */
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void (*set_backlight)(PrivateData *p, int state);
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/* Set contrast */
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void (*set_contrast)(PrivateData *p, int value);
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/* Output "data" to output latch if there is one */
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void (*output)(PrivateData *p, int data);
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/* Close the interface on shutdown */
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void (*close)(PrivateData *p);
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} GLCD_functions;
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/* ================== Framebuffer functions and macros =================== */
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#define BYTES_PER_LINE (p->framebuf.bytesPerLine)
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#define FB_BYTES_TOTAL (p->framebuf.px_height * BYTES_PER_LINE)
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#define FB_BLACK 1
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#define FB_WHITE 0
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/**
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* Draw one pixel into the framebuffer using 1bpp (black and white). This
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* function actually decides about the format of the framebuffer. Using this
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* implementation (0,0) is top left and bytes contain pixels from left to right.
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*
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* \param fb Pointer to framebuffer
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* \param x X-position
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* \param y Y-position
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* \param color Pixel color: 1 = set (black), 0 = not set (blank/white)
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*/
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static inline void
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fb_draw_pixel(struct glcd_framebuf *fb, int x, int y, int color)
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{
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unsigned int pos; /* Byte within the framebuffer */
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unsigned char bit; /* Bit within the framebuffer byte */
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if (x < 0 || x >= fb->px_width || y < 0 || y >= fb->px_height)
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return;
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pos = y * fb->bytesPerLine + (x / 8);
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bit = 0x80 >> (x % 8);
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if (color == FB_BLACK)
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fb->data[pos] |= bit;
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else
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fb->data[pos] &= ~bit;
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}
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/**
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* Get color value of one pixel from the framebuffer.
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*
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* \param fb Pointer to framebuffer
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* \param x X-position
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* \param y Y-position
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* \return Pixel color: 1 = set (black), 0 = not set (blank/white)
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*/
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static inline int
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fb_get_pixel(struct glcd_framebuf *fb, int x, int y)
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{
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unsigned int pos;
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unsigned char bit;
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if (x < 0 || x >= fb->px_width || y < 0 || y >= fb->px_height)
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return FB_WHITE;
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pos = y * fb->bytesPerLine + (x / 8);
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bit = 0x80 >> (x % 8);
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if (fb->data[pos] & bit)
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return FB_BLACK;
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else
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return FB_WHITE;
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}
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#endif
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