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#include "png_util.h"
static int x, y;
static int width, height;
static png_byte color_type;
static png_byte bit_depth;
static png_structp png_ptr;
static png_infop info_ptr;
static int number_of_passes;
static png_bytep * row_pointers = 0;
static png_bytep row_pointers_bit_shift = 0;
static int row_byte_len = 0;
//#define UNIT_TEST 1
#ifdef UNIT_TEST
int fd = open("/tmp/dump.txt", O_WRONLY|O_CREAT|O_LARGEFILE, 0644);
#endif
static int read_png_file(char* file_name)
{
/* 8 is the maximum size that can be checked */
char header[8] = {0,};
/* open file and test for it being a png */
FILE *fp = fopen(file_name, "rb");
if (!fp)
{
fprintf(stderr, "[read_png_file] File %s could not be opened for reading\n", file_name);
return 0;
}
fread(header, 1, 8, fp);
if (png_sig_cmp((png_byte*)header, 0, 8))
{
fprintf(stderr, "[read_png_file] File %s is not recognized as a PNG file\n", file_name);
return 0;
}
/* initialize stuff */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
fprintf(stderr, "[read_png_file] png_create_read_struct failed\n");
return 0;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
fprintf(stderr, "[read_png_file] png_create_info_struct failed\n");
return 0;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
fprintf(stderr, "[read_png_file] Error during init_io\n");
return 0;
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
width = png_get_image_width(png_ptr, info_ptr);
height = png_get_image_height(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
number_of_passes = png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
/* read file */
if (setjmp(png_jmpbuf(png_ptr)))
{
fprintf(stderr, "[read_png_file] Error during read_image\n");
return 0;
}
if(row_pointers == 0)
{
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
row_byte_len = png_get_rowbytes(png_ptr,info_ptr);
for (y=0; y<height; y++)
{
row_pointers[y] = (png_byte*) malloc(row_byte_len);
}
row_pointers_bit_shift = (unsigned char*) malloc(sizeof(unsigned char) * height * width * 2);
}
png_read_image(png_ptr, row_pointers);
fclose(fp);
return 1;
}
PNGUtil *PNGUtil::instance = 0;
PNGUtil::PNGUtil()
{
instance = this;
device_fd = -1;
}
PNGUtil::~PNGUtil()
{
disconnect();
}
PNGUtil *PNGUtil::getInstance()
{
return instance;
}
int PNGUtil::connect()
{
const char* device_file_name = "/dev/lcd2";
device_fd = open("/dev/lcd2", O_RDWR);
if(device_fd <0)
return 0;
return 1;
}
void PNGUtil::disconnect()
{
if(device_fd >= 0)
{
close(device_fd);
device_fd = -1;
}
}
int PNGUtil::send(char* png_file_name)
{
if(device_fd < 0)
{
fprintf(stderr, "unloaded!! retry.. connect!!\n");
return 0;
}
if(!read_png_file(png_file_name))
{
return 0;
}
{
int i,j;
int row_pointers_ptr = 0;
int row_pointers_2_ptr = 0;
for(i=0;i<height;i++)
{
for(j=0;j<row_byte_len;j+=3)
{
row_pointers_bit_shift[row_pointers_2_ptr]=(row_pointers[i][j]&248)|(row_pointers[i][j+1]>>5);
row_pointers_bit_shift[row_pointers_2_ptr+1]=((row_pointers[i][j+1]&28)<<3)|(row_pointers[i][j+2]>>3);
row_pointers_2_ptr += 2;
}
}
}
#ifdef UNIT_TEST
{
int w = write(fd, row_pointers_bit_shift , height * width * 2);
printf("write to dst_fd : %d\n",w);
}
#endif
#ifndef UNIT_TEST
{
int w=-1;
w = write(device_fd, row_pointers_bit_shift, height * width * 2);
printf("write ret : %d\n",w);
// ret = ioctl(device_fd, 0);
printf("write to /dev/lcd2 : %d\n",w);
}
#endif
return 1;
}
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