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| //Functions for overriding reading/writing png using iostreams
void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
FILE * file = ( FILE *)(png_get_io_ptr(png_ptr));
fread((char *)data, 1, length, file);
}
void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
FILE * file = ( FILE *)(png_get_io_ptr(png_ptr));
fwrite((char *)data, 1, length, file);
}
void user_flush_data(png_structp png_ptr)
{
FILE * file = ( FILE *)(png_get_io_ptr(png_ptr));
//flush(0);
}
// extraction des canaux R,G,B
float** load(char *file_name ,int bande)
{
int width, height,x,y;
png_byte color_type;
png_byte bit_depth;
png_structp png_ptr;
png_infop info_ptr,info_ptr2;
int number_of_passes;
png_bytep * row_pointers;
float** T;FILE *fp;
char header[8]; // 8 is the maximum size that can be checked
fp = fopen(file_name, "rb");
if (!fp)
printf("[read_png_file] File %s could not be opened for reading", file_name);
fread(header, 1, 8, fp);
if (!png_check_sig((unsigned char *) header, 8)) {
printf("[read_png_file] File %s erreur", file_name);
fclose(file_name);
return 0;
}
// initialize stuff
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
cout << "[read_png_file] png_create_read_struct failed" << endl;
return NULL;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
cout << "[read_png_file] png_create_info_struct failed" << endl;
png_destroy_read_struct(&png_ptr, NULL, NULL);
return NULL;
}
if (png_sig_cmp((png_bytep)header, 0, 8))
printf("[read_png_file] File %s is not recognized as a PNG file", file_name);
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
cout << "[read_png_file] probleme d'initialisation Error during init_io" << endl;
return NULL;
}
png_ptr->io_ptr = (png_voidp)file_name;
png_set_sig_bytes(png_ptr, 8);
png_set_read_fn(png_ptr, &fp, user_read_data);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
width = info_ptr->width;
height = info_ptr->height;
number_of_passes = png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
for (y=0; y<height; y++)
row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes);
png_read_image(png_ptr, row_pointers);
T=allocate_2d_float(height,width,0);
for (y=0; y<height; y++)
{
png_byte* row = row_pointers[y];
for (x=0; x<width; x++)
{
png_byte* ptr = &(row[x*3]);
//printf("Pixel at position [ %d - %d ] has the following RGBA values: %d - %d - %d - %d\n",
// x, y, ptr[0], ptr[1], ptr[2], ptr[3]);
if(bande == 1) T[y][x] =(float)static_cast<float>(ptr[0]);
if(bande == 2) T[y][x] =(float)static_cast<float>(ptr[1]);
if(bande == 3) T[y][x] =(float)static_cast<float>(ptr[2]);
}
}
fclose(fp);
return T;
}
void save_image_resultat(char *name,int Ni,int Nj,float **denoised_R,float **denoised_G,float **denoised_B,char * type)
{
int width, height,x,y;
png_structp png_ptr;
png_infop info_ptr;
png_bytep * row_pointers;
FILE *fp = fopen(name, "wb");
if (!fp)
printf("[write_png_file] File %s could not be opened for writing", nameDenoisedChar);
// initialize stuff
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
cout << "[write_png_file] png_create_write_struct failed" << endl;
return;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
cout << "[write_png_file] png_create_info_struct failed" << endl;
png_destroy_write_struct(&png_ptr, NULL);
return;
}
png_init_io(png_ptr, fp);
if (setjmp(png_jmpbuf(png_ptr)))
{
cout << "[write_png_file] Error during init_io" << endl;
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_set_write_fn(png_ptr, &fp, user_write_data, user_flush_data);
//write header
if (setjmp(png_jmpbuf(png_ptr)))
{
cout << "[write_png_file] Error during writing header" << endl;
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_set_IHDR(png_ptr, info_ptr, width, height,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
// write bytes
if (setjmp(png_jmpbuf(png_ptr)))
{
cout << "[write_png_file] Error during writing bytes" << endl;
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * Ni);
for (y=0; y<Ni; y++)
row_pointers[y] = (png_byte*) malloc(sizeof(png_bytep) * Nj);
for (y=0; y<Ni; y++)
{
png_byte* row = row_pointers[y];
for (x=0; x<Nj; x++)
{
png_byte* ptr = &(row[x*3]);
if(denoised_R[y][x]<=0) ptr[0] = 0;
else if(denoised_R[y][x]>=255) ptr[0] = 255;
else ptr[0] = denoised_R[y][x];
if(denoised_G[y][x]<=0) ptr[1] = 0;
else if(denoised_G[y][x]>=255) ptr[1] = 255;
else ptr[1] = denoised_G[y][x];
if(denoised_B[y][x]<=0) ptr[2] = 0;
else if(denoised_B[y][x]>=255) ptr[2] = 255;
else ptr[2] = denoised_B[y][x];
}
}
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, NULL);
for ( y=0; y<height; y++)
free(row_pointers[y]);
free(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
} |
Lecture et ecriture d'une png sous windows mobile
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