int main(int argc, char **argv) {
if(argc > 1)
max = atoi(argv[1]);
assert(scope_open(0) == 0);
pthread_create(&data_cb_pthread, NULL, (void *) data_cb, NULL);
test();
while(!done) {}
pthread_join(data_cb_pthread, NULL);
scope_close();
return 0;
}
bool PNGImage::load_from_file(const char* path)
{
uint8_t header[8]; // 8 is the maximum size that can be checked
// open file and test for it being a png
FILE *fp = fopen(path, "rb");
if (!fp) {
printf("[read_png_file] File %s could not be opened for reading", path);
return false;
}
ScopedCloseFile scope_close(fp);
fread(header, 1, 8, fp);
if (png_sig_cmp(header, 0, 8)) {
printf("[read_png_file] File %s is not recognized as a PNG file", path);
return false;
}
// initialize stuff
_png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
if (!_png_ptr) {
printf("[read_png_file] png_create_read_struct failed");
return false;
}
_info_ptr = png_create_info_struct(png(_png_ptr));
if (!_info_ptr) {
printf("[read_png_file] png_create_info_struct failed");
return false;
}
if (setjmp(png_jmpbuf(png(_png_ptr)))) {
printf("[read_png_file] Error during init_io");
return false;
}
png_init_io(png(_png_ptr), fp);
png_set_sig_bytes(png(_png_ptr), 8);
png_read_info(png(_png_ptr), png_info(_info_ptr));
_size.width = png_get_image_width(png(_png_ptr), png_info(_info_ptr));
_size.height = png_get_image_height(png(_png_ptr), png_info(_info_ptr));
png_byte color_type = png_get_color_type(png(_png_ptr), png_info(_info_ptr));
int bit_depth = png_get_bit_depth(png(_png_ptr), png_info(_info_ptr));
// let's just support 8bits per channel for now
if (bit_depth == 16) {
png_set_strip_16(png(_png_ptr));
}
if (bit_depth < 8) {
png_set_packing(png(_png_ptr));
}
// fill alpha channel with 255 if absent
if (color_type == PNG_COLOR_TYPE_RGB){
png_set_filler(png(_png_ptr), 255, PNG_FILLER_BEFORE);
}
int number_of_passes = png_set_interlace_handling(png(_png_ptr));
png_read_update_info(png(_png_ptr), png_info(_info_ptr));
// read file
if (setjmp(png_jmpbuf(png(_png_ptr)))) {
printf("[read_png_file] Error during read_image");
return false;
}
_rows = (png_bytep*) malloc(sizeof(png_bytep) * _size.height);
for (int y = 0; y < _size.height; y++) {
_rows[y] = (png_byte*) malloc(png_get_rowbytes(png(_png_ptr),png_info(_info_ptr)));
}
png_read_image(png(_png_ptr), _rows);
return true;
}