/*
?*?File:????gsnap.c
?*?Author:??Li?XianJing?
?*?Brief:???snap?the?linux?mobile?device?screen.
?*
?*?Copyright?（c）?2009-2011??Li?XianJing?
?*
?*/

/*
?*?History:
?*?================================================================
?*?2009-08-20?Li?XianJing??created
?*?2011-02-28?Li?XianJing??suppport?RGB888?framebuffer.
?*?2011-04-09?Li?XianJing??merge?figofuture‘s?png?output.
?*?	ref:?http://blog.chinaunix.net/space.php?uid=15059847&do=blog&cuid=2040565
?*
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

struct?_FBInfo;
typedef?struct?_FBInfo?FBInfo;
typedef?int?（*UnpackPixel）（FBInfo*?fb?unsigned?char*?pixel?
	unsigned?char*?r?unsigned?char*?g?unsigned?char*?b）;

struct?_FBInfo
{
	int?fd;
	UnpackPixel?unpack;
	unsigned?char?*bits;
	struct?fb_fix_screeninfo?fi;
	struct?fb_var_screeninfo?vi;
};

#define?fb_width（fb）??（（fb）->vi.xres）
#define?fb_height（fb）?（（fb）->vi.yres）
#define?fb_bpp（fb）????（（fb）->vi.bits_per_pixel>>3）
#define?fb_size（fb）???（（fb）->vi.xres?*?（fb）->vi.yres?*?fb_bpp（fb））
#define?fb_line_length（fb）?（（fb）->fi.line_length）

static?int?fb_unpack_rgb565（FBInfo*?fb?unsigned?char*?pixel?
	unsigned?char*?r?unsigned?char*?g?unsigned?char*?b）
{
	unsigned?short?color?=?*（unsigned?short*）pixel;

	*r?=?（（color?>>?11）?&?0xff）?<	*g?=?（（color?>>?5）?&?0xff）??<	*b?=?（color?&?0xff?）<
	return?0;
}

static?int?fb_unpack_rgb24（FBInfo*?fb?unsigned?char*?pixel?
	unsigned?char*?r?unsigned?char*?g?unsigned?char*?b）
{
	*r?=?pixel[fb->vi.red.offset>>3];
	*g?=?pixel[fb->vi.green.offset>>3];
	*b?=?pixel[fb->vi.blue.offset>>3];

	return?0;
}

static?int?fb_unpack_argb32（FBInfo*?fb?unsigned?char*?pixel?
	unsigned?char*?r?unsigned?char*?g?unsigned?char*?b）
{
	*r?=?pixel[fb->vi.red.offset>>3];
	*g?=?pixel[fb->vi.green.offset>>3];
	*b?=?pixel[fb->vi.blue.offset>>3];

	return?0;
}

static?int?fb_unpack_none（FBInfo*?fb?unsigned?char*?pixel?
	unsigned?char*?r?unsigned?char*?g?unsigned?char*?b）
{
	*r?=?*g?=?*b?=?0;

	return?0;
}

static?void?set_pixel_unpacker（FBInfo*?fb）
{
	if（fb_bpp（fb）?==?2）
	{
		fb->unpack?=?fb_unpack_rgb565;
	}
	else?if（fb_bpp（fb）?==?3）
	{
		fb->unpack?=?fb_unpack_rgb24;
	}
	else?if（fb_bpp（fb）?==?4）
	{
		fb->unpack?=?fb_unpack_argb32;
	}
	else
	{
		fb->unpack?=?fb_unpack_none;
		printf（“%s:?not?supported?format.\n“?__func__）;
	}

	return;
}

static?int?fb_open（FBInfo*?fb?const?char*?fbfilename）
{
	fb->fd?=?open（fbfilename?O_RDWR）;

	if?（fb->fd?	{
		fprintf（stderr?“can‘t?open?%s\n“?fbfilename）;

		return?-1;
	}

	if?（ioctl（fb->fd?FBIOGET_FSCREENINFO?&fb->fi）?		goto?fail;

	if?（ioctl（fb->fd?FBIOGET_VSCREENINFO?&fb->vi）?		goto?fail;

	fb->bits?=?mmap（0?fb_size（fb）?PROT_READ?|?PR