int main(int argc, char **argv) {
unsigned error;
unsigned char* image;
unsigned width, height;
unsigned char* png;
size_t pngsize;
LodePNGState state;
if (argc != 3) {
fprintf(stderr, "Usage: %s input-8bit.png output-32bit.png\n\nVersion 0.2, © 2014 Kornel Lesiński <*****@*****.**>\nhttps://github.com/pornel/undither\n\n", argv[0]);
return 1;
}
lodepng_state_init(&state);
state.decoder.color_convert = 0;
state.info_raw.colortype = LCT_PALETTE;
state.info_raw.bitdepth = 8;
error = lodepng_load_file(&png, &pngsize, argv[1]);
if (!error) {
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
}
free(png);
if (error) {
fprintf(stderr, "error when loading '%s': %s\n", argv[1], lodepng_error_text(error));
return error;
}
if (state.info_raw.bitdepth != 8) {
fprintf(stderr, "Only 256-color images are supported\n");
return 1;
}
const rgba *pal = (rgba *)state.info_raw.palette;
if (!pal || state.info_raw.colortype != LCT_PALETTE) {
fprintf(stderr, "No pal?\n");
return 1;
}
rgba *out = malloc(width*height*4);
undither(image, pal, width, height, out);
lodepng_state_cleanup(&state);
free(image);
error = lodepng_encode32_file(argv[2], (unsigned char*)out, width, height);
if (error) {
fprintf(stderr, "error when saving '%s': %s\n", argv[2], lodepng_error_text(error));
return error;
}
return 0;
}
SDL_Surface *TCOD_sys_read_png(const char *filename) {
unsigned error;
unsigned char* image;
unsigned width, height, y, bpp;
unsigned char* png;
size_t pngsize;
LodePNGState state;
SDL_Surface *bitmap;
unsigned char *source;
unsigned int rowsize;
lodepng_state_init(&state);
/*optionally customize the state*/
if (!TCOD_sys_read_file(filename,&png,&pngsize)) return NULL;
lodepng_inspect(&width,&height,&state, png, pngsize);
bpp=lodepng_get_bpp(&state.info_png.color);
if ( bpp == 24 ) {
/* don't convert to 32 bits because libtcod's 24bits renderer is faster */
state.info_raw.colortype=LCT_RGB;
} else if ( bpp != 24 && bpp != 32 ) {
/* paletted png. convert to 24 bits */
state.info_raw.colortype=LCT_RGB;
state.info_raw.bitdepth=8;
bpp=24;
}
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
free(png);
if(error) {
printf("error %u: %s\n", error, lodepng_error_text(error));
lodepng_state_cleanup(&state);
return NULL;
}
/* create the SDL surface */
bitmap=TCOD_sys_get_surface(width,height,bpp==32);
source=image;
rowsize=width*bpp/8;
for (y=0; y< height; y++ ) {
Uint8 *row_pointer=(Uint8 *)(bitmap->pixels) + y * bitmap->pitch;
memcpy(row_pointer,source,rowsize);
source+=rowsize;
}
lodepng_state_cleanup(&state);
free(image);
return bitmap;
}
/*
Example 3
Load PNG file from disk using a State, normally needed for more advanced usage.
*/
void decodeWithState(const char *filename)
{
unsigned error;
unsigned char *image;
unsigned width, height;
unsigned char *png;
size_t pngsize;
LodePNGState state;
lodepng_state_init(&state);
/*optionally customize the state*/
lodepng_load_file(&png, &pngsize, filename);
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
if (error) printf("error %u: %s\n", error, lodepng_error_text(error));
free(png);
/*use image here*/
/*state contains extra information about the PNG such as text chunks, ...*/
lodepng_state_cleanup(&state);
free(image);
}
int main(void)
{
unsigned error;
unsigned char* image;
unsigned width, height;
unsigned char* png;
size_t pngsize;
LodePNGState state;
char filename[] = "handmaze.png"; /* NAME OF INPUT IMAGE */
lodepng_state_init(&state);
/*optionally customize the state*/
state.info_raw.colortype = LCT_GREY;
lodepng_load_file(&png, &pngsize, filename);
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
free(png);
/*use image here*/
//printf("Width=%d Height=%d\n", width, height);
//FILE * fp;
//fp = fopen("imgout.txt", "w");
//fp = fopen("imgout.ram", "wb");
//int i,x,y;
//char * ramimg = (char*) calloc(2*width*height, sizeof(char));
//for(i = 0; i < 2*width*height; i++){
//fprintf(fp, "%d (%d,%d)=%d\n", i, i%width, i/width, image[i]);
// if(i%2 == 0)
// ramimg[i] = image[i/2];
// else
// ramimg[i] = 0;
//}
//fwrite(ramimg, sizeof(unsigned char), 2*width*height, fp);
//free(ramimg);
//fclose(fp);
//for(y = 0; y < height; y++) {
// for(x = 0; x < width; x++) {
// fprintf(fp, "(%d,%d)=%d\n", x, y, image[coords(x,y,width,height)]);
// }
//}
unsigned char * gaussimg = (unsigned char*) calloc(width*height, sizeof(char));
unsigned char * outimg = (unsigned char*) calloc(width*height, sizeof(char));
gaussian_blur(width, height, image, gaussimg);
sobel_filtering(width, height, gaussimg, outimg);
int right_coord, startx, starty, index1=6, index2=5;
int block_size =blocksize(width, height, image, &startx, &starty, 7, &right_coord, index1, index2);
//printf("blocksize = %d\n", block_size);
int solver;
unsigned char path[144];
int *size=(int *) malloc(sizeof(int));
*size = 0;
solver = dfs(width,height,image, startx, starty, startx, starty, block_size, path, size);
//printf("size = %d\n", *size);
int i1;
for(i1 = *size; i1 >= 0; i1--)
{
printf("%c\n", path[i1]);
}
//int x, y;
//for(x = 0; x < width; x++)
//{
// for(y = 0; y < height; y++)
// {
// outimg[coords(x,y,width,height)] = image[coords(x,y,width,height)];
// }
//}
unsigned char* outpng;
error = lodepng_encode(&outpng, &pngsize, outimg, width, height, &state);
if(!error) lodepng_save_file(outpng, pngsize, "sobel.png"); /* NAME OF OUTPUT IMAGE */
if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
/* CLEANUP */
lodepng_state_cleanup(&state);
free(image);
free(outimg);
return 0;
}
m3d_Image *m3d_PngLoad(const char *filename) {
unsigned char *image = NULL;
unsigned int width = 0, height = 0;
unsigned int error = 0;
unsigned char* png;
size_t pngsize;
LodePNGState state;
lodepng_state_init(&state);
lodepng_load_file(&png, &pngsize, filename);
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
if(error) {
printf("loading of image \"%s\" failed (%s)\n",
filename, lodepng_error_text(error));
free(png);
return NULL;
}
m3d_ImageFormat image_format = M3D_IMAGE_RGBA;
switch (state.info_png.color.colortype) {
case LCT_GREY:
image_format = M3D_IMAGE_GREYSCALE;
break;
case LCT_RGB:
image_format = M3D_IMAGE_RGB;
break;
case LCT_PALETTE:
image_format = M3D_IMAGE_INDEXED;
break;
case LCT_GREY_ALPHA:
image_format = M3D_IMAGE_GREYSCALE_ALPHA;
break;
case LCT_RGBA:
image_format = M3D_IMAGE_RGBA;
break;
default:
printf("loading of .png image \"%s\" failed (unknow image type)\n",
filename);
free(png);
lodepng_state_cleanup(&state);
free(image);
return NULL;
break;
}
m3d_Image *mimage = m3d_ImageInit(image_format, width, height);
if (!mimage) {
printf("loading of image \"%s\" failed (alloc. error)\n",
filename);
}
m3d_ImageCopyData(mimage, M3D_IMAGE_RGBA, image);
if (image_format == M3D_IMAGE_INDEXED) {
mimage->palette = state.info_png.color.palette;
mimage->palette_size = state.info_png.color.palettesize;
}
free(image);
free(png);
lodepng_state_cleanup(&state);
return mimage;
}