Add gpanel library.

src/libgpanel/Makefile

@@ -0,0 +1,18 @@
+TOPSRC          = $(shell cd ../..; pwd)
+include $(TOPSRC)/target.mk
+
+CFLAGS          += -O -Wall -Werror
+
+OBJS    	= open.o clear.o pixel.o line.o rect.o fill.o circle.o \
+                  image.o char.o text.o text_width.o
+
+all:    	../libgpanel.a
+
+../libgpanel.a: ${OBJS}
+		@$(AR) cru $@ ${OBJS}
+		$(RANLIB) $@
+
+install: 	all
+
+clean:
+		rm -f *.o a.out core test errs ../libgpanel*.a

src/libgpanel/char.c

@@ -0,0 +1,39 @@
+/*
+ * Draw a single character glyph.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_char(const struct gpanel_font_t *font, int color, int background,
+    int x, int y, int sym)
+{
+    struct gpanel_char_t param;
+
+    param.font = font;
+    param.color = color;
+    param.background = background;
+    param.x = x;
+    param.y = y;
+    param.sym = sym;
+    ioctl(_gpanel_fd, GPANEL_CHAR, &param);
+}

src/libgpanel/circle.c

@@ -0,0 +1,36 @@
+/*
+ * Draw a circle (no fill).
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_circle(int color, int x, int y, int radius)
+{
+    struct gpanel_circle_t param;
+
+    param.color = color;
+    param.x = x;
+    param.y = x;
+    param.radius = radius;
+    ioctl(_gpanel_fd, GPANEL_CIRCLE, &param);
+}

src/libgpanel/clear.c

@@ -0,0 +1,30 @@
+/*
+ * Clear the screen.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_clear(int color)
+{
+    ioctl(_gpanel_fd, GPANEL_CLEAR, color);
+}

src/libgpanel/fill.c

@@ -0,0 +1,37 @@
+/*
+ * Fill a rectangle.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_fill(int color, int x0, int y0, int x1, int y1)
+{
+    struct gpanel_rect_t param;
+
+    param.color = color;
+    param.x0 = x0;
+    param.y0 = y0;
+    param.x1 = x1;
+    param.y1 = y1;
+    ioctl(_gpanel_fd, GPANEL_FILL, &param);
+}

src/libgpanel/image.c

@@ -0,0 +1,37 @@
+/*
+ * Draw a rectangular image.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_image(int x, int y, int width, int height, const unsigned short *data)
+{
+    struct gpanel_image_t param;
+
+    param.x = x;
+    param.y = x;
+    param.width = width;
+    param.height = height;
+    param.image = data;
+    ioctl(_gpanel_fd, GPANEL_IMAGE, &param);
+}

src/libgpanel/line.c

@@ -0,0 +1,37 @@
+/*
+ * Draw a line.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_line(int color, int x0, int y0, int x1, int y1)
+{
+    struct gpanel_line_t param;
+
+    param.color = color;
+    param.x0 = x0;
+    param.y0 = y0;
+    param.x1 = x1;
+    param.y1 = y1;
+    ioctl(_gpanel_fd, GPANEL_LINE, &param);
+}

src/libgpanel/open.c

@@ -0,0 +1,50 @@
+/*
+ * Device open and close routines.
+ *
+ * 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.
+ */
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/gpanel.h>
+
+int _gpanel_fd = -1;
+
+/*
+ * Open a graphics panel device.
+ */
+int gpanel_open(const char *devname)
+{
+    _gpanel_fd = open(devname, O_RDWR);
+    if (_gpanel_fd < 0)
+        return -1;
+    return 0;
+}
+
+/*
+ * Close gpanel device.
+ */
+void gpanel_close(void)
+{
+    if (_gpanel_fd >= 0) {
+        close(_gpanel_fd);
+        _gpanel_fd = -1;
+    }
+}

src/libgpanel/pixel.c

@@ -0,0 +1,35 @@
+/*
+ * Draw a single pixel.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_pixel(int color, int x, int y)
+{
+    struct gpanel_pixel_t param;
+
+    param.color = color;
+    param.x = x;
+    param.y = x;
+    ioctl(_gpanel_fd, GPANEL_PIXEL, &param);
+}

src/libgpanel/rect.c

@@ -0,0 +1,37 @@
+/*
+ * Draw a rectangle frame (no fill).
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_rect(int color, int x0, int y0, int x1, int y1)
+{
+    struct gpanel_rect_t param;
+
+    param.color = color;
+    param.x0 = x0;
+    param.y0 = y0;
+    param.x1 = x1;
+    param.y1 = y1;
+    ioctl(_gpanel_fd, GPANEL_RECT, &param);
+}

src/libgpanel/text.c

@@ -0,0 +1,39 @@
+/*
+ * Draw a string.
+ *
+ * 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.
+ */
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+void gpanel_text(const struct gpanel_font_t *font, int color, int background,
+    int x, int y, const char *text)
+{
+    struct gpanel_text_t param;
+
+    param.font = font;
+    param.color = color;
+    param.background = background;
+    param.x = x;
+    param.y = y;
+    param.text = text;
+    ioctl(_gpanel_fd, GPANEL_TEXT, &param);
+}

src/libgpanel/text_width.c

@@ -0,0 +1,52 @@
+/*
+ * Compute a string width in pixels.
+ *
+ * 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.
+ */
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/gpanel.h>
+
+/*
+ * Calculate a width of text output.
+ * Handle both fixed and proportional fonts.
+ * TODO: UTF8 decoding.
+ */
+int gpanel_text_width(const struct gpanel_font_t *font, const char *text, int nchars)
+{
+    int width, c;
+
+    if (! nchars)
+        nchars = strlen (text);
+    if (! font->width) {
+        /* Fixed-width font. */
+        return nchars * font->maxwidth;
+    }
+
+    width = 0;
+    while (--nchars >= 0) {
+        c = (unsigned char) *text++;
+        if (c < font->firstchar || c >= font->firstchar + font->size)
+            c = font->defaultchar;
+        width += font->width[c - font->firstchar];
+    }
+    return width;
+}

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 */