code.vuplus.com Git - vuplus_openvuplus_3.0/blob - meta-openvuplus/recipes-vuplus/png-util/files/png_util.cpp

   1 #include "png_util.h"
   2
   3 static int x, y;
   4 static int width, height;
   5
   6 static png_byte color_type;
   7 static png_byte bit_depth;
   8
   9 static png_structp png_ptr;
  10 static png_infop info_ptr;
  11 static int number_of_passes;
  12 static png_bytep * row_pointers = 0;
  13 static png_bytep row_pointers_bit_shift = 0;
  14 static int row_byte_len = 0;
  15
  16 //#define UNIT_TEST 1
  17 #ifdef UNIT_TEST
  18 int fd = open("/tmp/dump.txt", O_WRONLY|O_CREAT|O_LARGEFILE, 0644);
  19 #endif
  20
  21 static int read_png_file(char* file_name)
  22 {
  23         /* 8 is the maximum size that can be checked */
  24         char header[8] = {0,};
  25
  26         /* open file and test for it being a png */
  27         FILE *fp = fopen(file_name, "rb");
  28         if (!fp)
  29         {
  30                 fprintf(stderr, "[read_png_file] File %s could not be opened for reading\n", file_name);
  31                 return 0;
  32         }
  33
  34         fread(header, 1, 8, fp);
  35         if (png_sig_cmp((png_byte*)header, 0, 8))
  36         {
  37                 fprintf(stderr, "[read_png_file] File %s is not recognized as a PNG file\n", file_name);
  38                 return 0;
  39         }
  40
  41         /* initialize stuff */
  42         png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  43
  44         if (!png_ptr)
  45         {
  46                 fprintf(stderr, "[read_png_file] png_create_read_struct failed\n");
  47                 return 0;
  48         }
  49
  50         info_ptr = png_create_info_struct(png_ptr);
  51         if (!info_ptr)
  52         {
  53                 fprintf(stderr, "[read_png_file] png_create_info_struct failed\n");
  54                 return 0;
  55         }
  56
  57         if (setjmp(png_jmpbuf(png_ptr)))
  58         {
  59                 fprintf(stderr, "[read_png_file] Error during init_io\n");
  60                 return 0;
  61         }
  62
  63         png_init_io(png_ptr, fp);
  64         png_set_sig_bytes(png_ptr, 8);
  65
  66         png_read_info(png_ptr, info_ptr);
  67
  68         width = png_get_image_width(png_ptr, info_ptr);
  69         height = png_get_image_height(png_ptr, info_ptr);
  70         color_type = png_get_color_type(png_ptr, info_ptr);
  71         bit_depth = png_get_bit_depth(png_ptr, info_ptr);
  72
  73         number_of_passes = png_set_interlace_handling(png_ptr);
  74         png_read_update_info(png_ptr, info_ptr);
  75
  76         /* read file */
  77         if (setjmp(png_jmpbuf(png_ptr)))
  78         {
  79                 fprintf(stderr, "[read_png_file] Error during read_image\n");
  80                 return 0;
  81         }
  82
  83         if(row_pointers == 0)
  84         {
  85                 row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
  86                 row_byte_len = png_get_rowbytes(png_ptr,info_ptr);
  87                 for (y=0; y<height; y++)
  88                 {
  89                         row_pointers[y] = (png_byte*) malloc(row_byte_len);
  90                 }
  91                 row_pointers_bit_shift = (unsigned char*) malloc(sizeof(unsigned char) * height * width * 2);
  92         }
  93
  94         png_read_image(png_ptr, row_pointers);
  95         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
  96         fclose(fp);
  97         return 1;
  98 }
  99
 100 PNGUtil *PNGUtil::instance = 0;
 101
 102 PNGUtil::PNGUtil()
 103 {
 104         instance = this;
 105         device_fd = -1;
 106 }
 107
 108 PNGUtil::~PNGUtil()
 109 {
 110         disconnect();
 111 }
 112
 113 PNGUtil *PNGUtil::getInstance()
 114 {
 115         return instance;
 116 }
 117
 118 int PNGUtil::connect()
 119 {
 120         const char* device_file_name = "/dev/lcd2";
 121         device_fd = open("/dev/lcd2", O_RDWR);
 122         if(device_fd <0)
 123                 return 0;
 124         return 1;
 125 }
 126
 127 void PNGUtil::disconnect()
 128 {
 129         if(device_fd >= 0)
 130         {
 131                 close(device_fd);
 132                 device_fd = -1;
 133         }
 134 }
 135
 136 int PNGUtil::send(char* png_file_name)
 137 {
 138         if(device_fd < 0)
 139         {
 140                 fprintf(stderr, "unloaded!! retry.. connect!!\n");
 141                 return 0;
 142         }
 143         if(!read_png_file(png_file_name))
 144         {
 145                 return 0;
 146         }
 147         {
 148
 149                 int i,j;
 150                 int row_pointers_ptr = 0;
 151                 int row_pointers_2_ptr = 0;
 152
 153                 for(i=0;i<height;i++)
 154                 {
 155                         for(j=0;j<row_byte_len;j+=3)
 156                         {
 157                                 row_pointers_bit_shift[row_pointers_2_ptr]=(row_pointers[i][j]&248)|(row_pointers[i][j+1]>>5);
 158                                 row_pointers_bit_shift[row_pointers_2_ptr+1]=((row_pointers[i][j+1]&28)<<3)|(row_pointers[i][j+2]>>3);
 159                                 row_pointers_2_ptr += 2;
 160                         }
 161                 }
 162         }
 163 #ifdef UNIT_TEST
 164         {
 165                 int w = write(fd, row_pointers_bit_shift , height * width * 2);
 166                 printf("write to dst_fd : %d\n",w);
 167         }
 168 #endif
 169 #ifndef UNIT_TEST
 170         {
 171                 int w=-1;
 172                 w = write(device_fd, row_pointers_bit_shift, height * width * 2);
 173                 printf("write ret : %d\n",w);
 174 //              ret = ioctl(device_fd, 0);
 175                 printf("write to /dev/lcd2 : %d\n",w);
 176         }
 177 #endif
 178         return 1;
 179 }
 180