[PATCH v3 4/4] GUI: Add fbtest command

[Andrey Smirnov <andrew.smirnov@gmail.com>]

Add 'fbtest' - a command to produce test patterns on a screen

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
---

Changes since v2:
	- Fixed a typo
	- 2 second delay logic changed to respond to Ctrl-C
          immediately as per Sascha's suggestion
	- fbtest_pattern_bars utilizes negative coordinates "feature" of
	  gu_fill_rectangle

 commands/Kconfig  |   9 +++
 commands/Makefile |   1 +
 commands/fbtest.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 211 insertions(+)
 create mode 100644 commands/fbtest.c

diff --git a/commands/Kconfig b/commands/Kconfig
index 880cd45..cf71289 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1417,6 +1417,15 @@ config CMD_SPLASH
 		  -b COLOR	background color in 0xttrrggbb
 		  -o		render offscreen
 
+config CMD_FBTEST
+	bool
+	depends on VIDEO
+	select 2D_PRIMITIVES
+	prompt "FB test"
+	help
+	  Framebuffer test command that allows to produce a number of
+	  test patterns on a screen.
+
 config CMD_READLINE
 	tristate
 	prompt "readline"
diff --git a/commands/Makefile b/commands/Makefile
index b8c07f3..5a899ab 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_CMD_HELP)		+= help.o
 obj-$(CONFIG_CMD_LSMOD)		+= lsmod.o
 obj-$(CONFIG_CMD_INSMOD)	+= insmod.o
 obj-$(CONFIG_CMD_SPLASH)	+= splash.o
+obj-$(CONFIG_CMD_FBTEST)	+= fbtest.o
 obj-$(CONFIG_USB_GADGET_DFU)	+= dfu.o
 obj-$(CONFIG_USB_GADGET_SERIAL)	+= usbserial.o
 obj-$(CONFIG_CMD_GPIO)		+= gpio.o
diff --git a/commands/fbtest.c b/commands/fbtest.c
new file mode 100644
index 0000000..d070d1f
--- /dev/null
+++ b/commands/fbtest.c
@@ -0,0 +1,201 @@
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <malloc.h>
+#include <getopt.h>
+#include <fb.h>
+#include <gui/graphic_utils.h>
+#include <gui/2d-primitives.h>
+#include <linux/gcd.h>
+#include <int_sqrt.h>
+
+static void fbtest_pattern_bars(struct screen *sc, u32 unused)
+{
+	int i;
+
+	const u32 xres = sc->info->xres;
+
+	const u32 colors[] =  {
+		0xFFFFFF, 	/* white */
+		0xFFFF00,	/* yellow */
+		0x00FFFF,	/* cyan */
+		0x00FF00,	/* green */
+		0xFF00FF,	/* magenta */
+		0xFF0000,	/* red */
+		0x0000FF,	/* blue */
+		0x000000,	/* black */
+	};
+
+	for (i = 0; i < ARRAY_SIZE(colors); i++) {
+		const u8 r = (colors[i] >> 16) & 0xff;
+		const u8 g = (colors[i] >>  8) & 0xff;
+		const u8 b = (colors[i] >>  0) & 0xff;
+		const int dx = xres / ARRAY_SIZE(colors);
+
+		gu_fill_rectangle(sc,
+				  i * dx, -1, (i + 1) * dx - 1, -1,
+				  r, g, b, 0xff);
+	}
+}
+
+static void fbtest_pattern_geometry(struct screen *sc, u32 color)
+{
+	int i;
+
+	const u8 r = (color >> 16) & 0xff;
+	const u8 g = (color >>  8) & 0xff;
+	const u8 b = (color >>  0) & 0xff;
+
+	const u32 xres = sc->info->xres;
+	const u32 yres = sc->info->yres;
+
+	const u8 xcount = xres / gcd(xres, yres);
+	const u8 ycount = yres / gcd(xres, yres);
+
+	const struct {
+		int x1, y1, x2, y2;
+	} borders[] = {
+		{ 0,        0,        xres - 1, 0        },
+		{ xres - 1, 0,        xres - 1, yres - 1 },
+		{ 0,        yres - 1, xres - 1, yres - 1 },
+		{ 0,        0,        0,        yres - 1 },
+	};
+
+	const int R1 = min(xres, yres) / 2;
+	const int h  = xres * xres + yres * yres;
+	const int R2 = (int_sqrt(h) / 2 - R1) * 5 / 12;
+
+	const  struct {
+		int x0, y0, radius;
+	} circles[] = {
+		{ xres / 2,  yres / 2,  R1 - 1 },
+		{ R2,        R2,        R2 - 1 },
+		{ xres - R2, R2,        R2 - 1 },
+		{ xres - R2, yres - R2, R2 - 1 },
+		{ R2,        yres - R2, R2 - 1 }
+	};
+
+	void *buf = gui_screen_render_buffer(sc);
+
+	gu_memset_pixel(sc->info, buf, ~color,
+			sc->s.width * sc->s.height);
+
+	for (i = 0; i < ARRAY_SIZE(borders); i++)
+		gu_draw_line(sc,
+			     borders[i].x1, borders[i].y1,
+			     borders[i].x2, borders[i].y2,
+			     r, g, b, 0xff, 10);
+
+	for (i = 0; i < ARRAY_SIZE(circles); i++)
+		gu_draw_circle(sc,
+			       circles[i].x0, circles[i].y0,
+			       circles[i].radius,
+			       r, g, b, 0xff);
+
+	for (i = 1; i < ycount; i++) {
+		const int y = (yres - 1) * i / ycount;
+		gu_draw_line(sc,
+			     0, y, xres - 1, y,
+			     r, g, b, 0xff, 0);
+	}
+
+
+	for (i = 1; i < xcount; i++) {
+		const int x = (xres - 1) * i / xcount;
+		gu_draw_line(sc,
+			     x, 0, x, yres - 1,
+			     r, g, b, 0xff, 0);
+	}
+}
+
+static int do_fbtest(int argc, char *argv[])
+{
+	struct screen *sc;
+	int opt;
+	unsigned int i;
+	const char *pattern_name = NULL;
+	char *fbdev = "/dev/fb0";
+	void (*pattern) (struct screen *sc, u32 color) = NULL;
+	u32 color = 0xffffff;
+
+	struct {
+		const char *name;
+		void (*func) (struct screen *sc, u32 color);
+	} patterns[] = {
+		{ "geometry", fbtest_pattern_geometry },
+		{ "bars",     fbtest_pattern_bars     }
+	};
+
+	while((opt = getopt(argc, argv, "d:p:c:")) > 0) {
+		switch(opt) {
+		case 'd':
+			fbdev = optarg;
+			break;
+		case 'p':
+			pattern_name = optarg;
+			break;
+		case 'c':
+			color = simple_strtoul(optarg, NULL, 16);
+			break;
+		}
+	}
+
+	if (pattern_name) {
+		for (i = 0; i < ARRAY_SIZE(patterns); i++)
+			if (!strcmp(pattern_name, patterns[i].name))
+				pattern = patterns[i].func;
+
+		if (!pattern) {
+			printf("Unknown pattern: %s\n", pattern_name);
+			return -EINVAL;
+		}
+	}
+
+	sc = fb_open(fbdev);
+	if (IS_ERR(sc)) {
+		perror("fd_open");
+		return PTR_ERR(sc);
+	}
+
+	if (!pattern_name) {
+		printf("No pattern selected. Cycling through all of them.\n");
+		printf("Press Ctrl-C to stop\n");
+
+		i = 0;
+		for (;;) {
+			uint64_t start;
+			pattern = patterns[i++ % ARRAY_SIZE(patterns)].func;
+			pattern(sc, color);
+			gu_screen_blit(sc);
+
+			start = get_time_ns();
+			while (!is_timeout(start, 2 * SECOND))
+				if (ctrlc())
+					goto done;
+		}
+	} else {
+		pattern(sc, color);
+		gu_screen_blit(sc);
+	}
+done:
+	fb_close(sc);
+
+	return 0;
+}
+
+BAREBOX_CMD_HELP_START(fbtest)
+BAREBOX_CMD_HELP_TEXT("This command displays a test pattern on a screen")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-d <fbdev>\t",    "framebuffer device (default /dev/fb0)")
+BAREBOX_CMD_HELP_OPT ("-c color\t", "color")
+BAREBOX_CMD_HELP_OPT ("-p pattern\t", "pattern name (geometry, bars)")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(fbtest)
+	.cmd		= do_fbtest,
+	BAREBOX_CMD_DESC("display a test pattern")
+	BAREBOX_CMD_OPTS("[-dcp]")
+	BAREBOX_CMD_GROUP(CMD_GRP_CONSOLE)
+	BAREBOX_CMD_HELP(cmd_fbtest_help)
+BAREBOX_CMD_END
-- 
2.5.5


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