程序非原创,是在李先静的工具基础上增加了保存为png格式的支持,在基于framebuffer的x86上和android模拟器上测试成功。下载地址如下:
http://blogimg.chinaunix.net/blog/upfile2/090828170135.bz2
源代码如下
/*
* File: gsnap.c
* Author: Li XianJing
* Brief: snap the linux mobile device screen.
*
* Copyright (c) 2009 Li XianJing
*
* 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 created
*
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "jpeglib.h"
#include
struct FB
{
int fd;
unsigned size;
unsigned short *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_size(fb) ((fb)->vi.xres * (fb)->vi.yres * 2)
static int fb_open(struct FB *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;
return 0;
fail:
printf("%s is not a framebuffer.\n", fbfilename);
close(fb->fd);
return -1;
}
static void fb_close(struct FB *fb)
{
munmap(fb->bits, fb_size(fb));
close(fb->fd);
}
static int snap2jpg(const char * filename, int quality, struct FB* fb)
{
int row_stride = 0;
FILE * outfile = NULL;
JSAMPROW row_pointer[1] = {0};
struct jpeg_error_mgr jerr = {0};
struct jpeg_compress_struct cinfo = {0};
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;
unsigned short* line = fb->bits + cinfo.next_scanline * fb_width(fb);
for(i = 0; i < fb_width(fb); i++)
{
int offset = i * 3;
unsigned short color = line[i];
unsigned char r = ((color >> 11) & 0xff) << 3;
unsigned char g = ((color >> 5) & 0xff) << 2;
unsigned char b = (color & 0xff )<< 3;
image_buffer[offset] = r;
image_buffer[offset + 1] = g;
image_buffer[offset + 2] = b;
}
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;
}
static int snap2png(const char * filename, int quality, struct FB* 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);
printf("[Framebuffer] width = %d height = %d\n",width,height);
png_bytep row_pointers[height];
png_byte* image_buffer = malloc(3 * width);
int i = 0;
int j = 0;
unsigned short* line = NULL;
for( ; i < height; i++ )
{
line = fb->bits + i * width;
for(j = 0; j < width; j++)
{
int offset = j * 3;
image_buffer[offset] = ((line[j] >> 11) & 0xff) << 3;
image_buffer[offset + 1] = ((line[j] >> 5) & 0xff) << 2;
image_buffer[offset + 2] = (line[j] & 0xff )<< 3;
}
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[])
{
struct FB fb = {0};
const char* filename = NULL;
const char* fbfilename = NULL;
if(argc != 3)
{
printf("\nusage: %s [jpeg/png] [framebuffer]\n", argv[0]);
printf("-----------------------------------------\n");
printf("Powered by broncho()\n");
return 0;
}
filename = argv[1];
fbfilename = argv[2];
if (fb_open(&fb, fbfilename) == 0)
{
char *extname = strrchr(argv[1],'.');
if(!strcasecmp( extname+1, "jpg" ) || !strcasecmp( extname+1, "jpeg" ) )
snap2jpg(filename, 100, &fb);
else if (!strcasecmp( extname+1, "png" ))
snap2png(filename,100,&fb);
else
printf("Unsupported file format!\n");
fb_close(&fb);
}
return 0;
}
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