/*
* File
: gsnap
.c
* Author
: Li XianJing <xianjimli@hotmail
.com>
* Brief
: snap the
linux mobile device screen
.
*
* Copyright
(c
) 2009 Li XianJing <xianjimli@hotmail
.com>
*
* Licensed under the Academic Free License version 2
.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
*
(at your option
) any later version
.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
. See the
* GNU General Public License for more details
.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc
., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* History
:
* ================================================================
* 2009-08-20 Li XianJing <xianjimli@hotmail
.com> created
* 2011-02-28 Li XianJing <xianjimli@hotmail
.com> suppport RGB888 framebuffer
.
* 2011-04-09 Li XianJing <xianjimli@hotmail
.com> merge figofuture's png output
.
* ref
: http://blog
.chinaunix
.net/space
.php?uid=15059847&do=blog&cuid=2040565
*
*/
#include <png
.h>
#include <f
cntl
.h>
#include <stdio
.h>
#include <stdlib
.h>
#include <unistd
.h>
#include <string
.h>
#include <jpeglib
.h>
#include <sys/mman
.h>
#include <sys/stat
.h>
#include <sys/types
.h>
#include <
linux/fb
.h>
#include <
linux/kd
.h>
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
))
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
) << 3;
*g =
((color >> 5
) & 0xff
) << 2;
*b =
(color & 0xff
)<< 3;
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 < 0
)
{
fprintf
(stderr, "can't open %s\n", fbfilename
);
return -1;
}
if
(ioctl
(fb->fd, FBIOGET_FSCREENINFO, &fb->fi
) < 0
)
goto fail;
if
(ioctl
(fb->fd, FBIOGET_VSCREENINFO, &fb->vi
) < 0
)
goto fail;
fb->bits = mmap
(0, fb_size
(fb
), PROT_READ | PROT_WRITE, MAP_SHARED, fb->fd, 0
);
if
(fb->bits == MAP_FAILED
)
goto fail;
printf
("---------------framebuffer---------------\n"
);
printf
("%s
: \n width
: %8d\n height
: %8d\n bpp
: %8d\n r
(%2d, %2d
)\n g
(%2d, %2d
)\n b
(%2d, %2d
)\n",
fbfilename, fb_width
(fb
), fb_height
(fb
), fb_bpp
(fb
),
fb->vi
.red
.offset, fb->vi
.red
.length,
fb->vi
.green
.offset, fb->vi
.green
.length,
fb->vi
.blue
.offset, fb->vi
.blue
.length
);
printf
("-----------------------------------------\n"
);
set_pixel_unpacker
(fb
);
return 0;
fail
:
printf
("%s is not a framebuffer
.\n", fbfilename
);
close
(fb->fd
);
return -1;
}
static void fb_close
(FBInfo* fb
)
{
munmap
(fb->bits, fb_size
(fb
));
close
(fb->fd
);
return;
}
static int snap2jpg
(const char * filename, int quality, FBInfo* fb
)
{
int row_stride = 0;
FILE * outfile = NULL;
JSAMPROW row_pointer[1] = {0};
struct jpeg_error_mgr jerr;
struct jpeg_compress_struct cinfo;
memset
(&jerr, 0x00, sizeof
(jerr
));
memset
(&cinfo, 0x00, sizeof
(cinfo
));
cinfo
.err = jpeg_std_error
(&jerr
);
jpeg_create_compress
(&cinfo
);
if
((outfile = fopen
(filename, "wb+"
)) == NULL
)
{
fprintf
(stderr, "can't open %s\n", filename
);
return -1;
}
jpeg_stdio_dest
(&cinfo, outfile
);
cinfo
.image_width = fb_width
(fb
);
cinfo
.image_height = fb_height
(fb
);
cinfo
.input_components = 3;
cinfo
.in_color_space = JCS_RGB;
jpeg_set_defaults
(&cinfo
);
jpeg_set_quality
(&cinfo, quality, TRUE
);
jpeg_start_compress
(&cinfo, TRUE
);
row_stride = fb_width
(fb
) * 2;
JSAMPLE* image_buffer = malloc
(3 * fb_width
(fb
));
while
(cinfo
.next_scanline < cinfo
.image_height
)
{
int i = 0;
int offset = 0;
unsigned char* line = fb->bits + cinfo
.next_scanline * fb_width
(fb
) * fb_bpp
(fb
);
for
(i = 0; i < fb_width
(fb
); i++, offset += 3, line += fb_bpp
(fb
))
{
fb->unpack
(fb, line, image_buffer+offset, image_buffer + offset + 1, image_buffer + offset + 2
);
}
row_pointer[0] = image_buffer;
(void
) jpeg_write_scanlines
(&cinfo, row_pointer, 1
);
}
jpeg_finish_compress
(&cinfo
);
fclose
(outfile
);
jpeg_destroy_compress
(&cinfo
);
return 0;
}
//Ref
: http://blog
.chinaunix
.net/space
.php?uid=15059847&do=blog&cuid=2040565
static int snap2png
(const char * filename, int quality, FBInfo* fb
)
{
FILE *outfile;
if
((outfile = fopen
(filename, "wb+"
)) == NULL
)
{
fprintf
(stderr, "can't open %s\n", filename
);
return -1;
}
/* prepare the standard PNG structures */
png_structp png_ptr = png_create_write_struct
(PNG_LIBPNG_VER_STRING,0,0,0
);
png_infop info_ptr = png_create_info_struct
(png_ptr
);
/* setjmp
() must be called in every function that calls a PNG-reading libpng function */
if
(setjmp
(png_jmpbuf
(png_ptr
)))
{
png_destroy_write_struct
(&png_ptr, &info_ptr
);
fclose
(outfile
);
return -1;
}
/* initialize the png structure */
png_init_io
(png_ptr, outfile
);
//
int width = 0;
int height = 0;
int bit_depth = 8;
int color_type = PNG_COLOR_TYPE_RGB;
int interlace = 0;
width = fb_width
(fb
);
height = fb_height
(fb
);
png_set_IHDR
(png_ptr, info_ptr, width, height, bit_depth, color_type,
(!interlace
) ? PNG_INTERLACE_NONE
: PNG_INTERLACE_ADAM7,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE
);
/* write the file header information */
png_write_info
(png_ptr, info_ptr
);
png_bytep row_pointers[height];
png_byte* image_buffer = malloc
(3 * width
);
int i = 0;
int j = 0;
unsigned char* line = NULL;
for
( ; i < height; i++
)
{
line =
(char*
)fb->bits + i * width * fb_bpp
(fb
);
for
(j = 0; j < width; j++, line += fb_bpp
(fb
))
{
int offset = j * 3;
fb->unpack
(fb, line, image_buffer+offset, image_buffer+offset+1, image_buffer+offset+2
);
}
row_pointers[i] = image_buffer;
png_write_rows
(png_ptr, &row_pointers[i], 1
);
}
png_destroy_write_struct
(&png_ptr, &info_ptr
);
fclose
(outfile
);
return 0;
}
int main
(int argc, char* argv[]
)
{
FBInfo fb;
const char* filename = NULL;
const char* fbfilename = NULL;
if
(argc != 3
)
{
printf
("\nUsage
: %s [jpeg|png file] [framebuffer dev]\n", argv[0]
);
printf
("Example
: %s fb
.jpg /dev/fb0\n", argv[0]
);
printf
("-----------------------------------------\n"
);
printf
("Powered by
broncho(www.broncho.cn)\n\n"
);
return 0;
}
filename = argv[1];
fbfilename = argv[2];
memset
(&fb, 0x00, sizeof
(fb
));
if
(fb_open
(&fb, fbfilename
) == 0
)
{
if
(strstr
(filename, "
.png"
) != NULL
)
{
snap2png
(filename, 100, &fb
);
}
else
{
snap2jpg
(filename, 100, &fb
);
}
fb_close
(&fb
);
}
return 0;
}
以上代码使用/dev/fb0实现截图功能，请重构，使用/dev/dri/card0实现截图功能。
bronchoLinux手机平台是一款基于Linux 2.6内核，采用GTK+/DirectFB作为GUI的移动操作系统。它具备经典架构设计，易于国际化，并且具有高度可扩展性和标准化的特点。平台实现了强大的功能，包括浏览器、即时通信、多媒体处理等。
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