Add gpanel library.

sys/include/gpanel.h

@@ -0,0 +1,119 @@
+/*
+ * Generic interface to a graphics panel device (TFT LCD, OLED and others).
+ *
+ * Copyright (C) 2015 Serge Vakulenko, <serge@vak.ru>
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * and its documentation for any purpose and without fee is hereby
+ * granted, provided that the above copyright notice appear in all
+ * copies and that both that the copyright notice and this
+ * permission notice and warranty disclaimer appear in supporting
+ * documentation, and that the name of the author not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ *
+ * The author disclaim all warranties with regard to this
+ * software, including all implied warranties of merchantability
+ * and fitness.  In no event shall the author be liable for any
+ * special, indirect or consequential damages or any damages
+ * whatsoever resulting from loss of use, data or profits, whether
+ * in an action of contract, negligence or other tortious action,
+ * arising out of or in connection with the use or performance of
+ * this software.
+ */
+#ifndef _GPANEL_H
+#define _GPANEL_H
+
+/*
+ * Proportional/fixed font structure.
+ */
+struct gpanel_font_t {
+    const char *    name;           /* font name */
+    int             maxwidth;       /* max width in pixels */
+    unsigned int    height;         /* height in pixels */
+    int             ascent;         /* ascent (baseline) height */
+    int             firstchar;      /* first character in bitmap */
+    int             size;           /* font size in characters */
+    const unsigned short *bits;     /* 16-bit right-padded bitmap data */
+    const unsigned short *offset;   /* offsets into bitmap data */
+    const unsigned char *width;     /* character widths or 0 if fixed */
+    int             defaultchar;    /* default char (not glyph index) */
+    long            bits_size;      /* # words of bits */
+};
+
+struct gpanel_pixel_t {
+    int             color;          /* pixel color */
+    int             x, y;           /* pixel position */
+};
+
+struct gpanel_line_t {
+    int             color;          /* line color */
+    int             x0, y0;         /* start point */
+    int             x1, y1;         /* end point */
+};
+
+struct gpanel_rect_t {
+    int             color;          /* border or fill color */
+    int             x0, y0;         /* start point */
+    int             x1, y1;         /* end point */
+};
+
+struct gpanel_circle_t {
+    int             color;          /* border color */
+    int             x, y;           /* center point */
+    int             radius;         /* circle radius */
+};
+
+struct gpanel_image_t {
+    int             x, y;           /* start point */
+    int             width, height;  /* image size radius */
+    const unsigned short *image;    /* array of pixels */
+};
+
+struct gpanel_char_t {
+    const struct gpanel_font_t *font; /* font data */
+    int             color;          /* text color */
+    int             background;     /* background color or -1 for transparent */
+    int             x, y;           /* position */
+    int             sym;            /* unicode symbol index */
+};
+
+struct gpanel_text_t {
+    const struct gpanel_font_t *font; /* font data */
+    int             color;          /* text color */
+    int             background;     /* background color or -1 for transparent */
+    int             x, y;           /* position */
+    const char      *text;          /* UTF-8 text */
+};
+
+#define GPANEL_CLEAR       _IOW('g', 1, int)
+#define GPANEL_PIXEL       _IOW('g', 2, struct gpanel_pixel_t)
+#define GPANEL_LINE        _IOW('g', 3, struct gpanel_line_t)
+#define GPANEL_RECT        _IOW('g', 4, struct gpanel_rect_t)
+#define GPANEL_FILL        _IOW('g', 5, struct gpanel_rect_t)
+#define GPANEL_CIRCLE      _IOW('g', 6, struct gpanel_circle_t)
+#define GPANEL_IMAGE       _IOW('g', 7, struct gpanel_image_t)
+#define GPANEL_CHAR        _IOW('g', 8, struct gpanel_char_t)
+#define GPANEL_TEXT        _IOW('g', 9, struct gpanel_text_t)
+
+#ifndef KERNEL
+/*
+ * User-level library.
+ */
+int gpanel_open(const char *devname);
+void gpanel_close(void);
+void gpanel_clear(int color);
+void gpanel_pixel(int color, int x, int y);
+void gpanel_line(int color, int x0, int y0, int x1, int y1);
+void gpanel_rect(int color, int x0, int y0, int x1, int y1);
+void gpanel_fill(int color, int x0, int y0, int x1, int y1);
+void gpanel_circle(int color, int x, int y, int radius);
+void gpanel_image(int x, int y, int width, int height, const unsigned short *data);
+void gpanel_char(const struct gpanel_font_t *font, int color, int background, int x, int y, int sym);
+void gpanel_text(const struct gpanel_font_t *font, int color, int background, int x, int y, const char *text);
+int gpanel_text_width(const struct gpanel_font_t *font, const char *text, int nchars);
+
+extern int _gpanel_fd;
+#endif
+
+#endif /* _GPANEL_H */