void from_565_rle(void) { unsigned short times, count; unsigned short in [2]; unsigned short color, outR, outG, outB; unsigned total = 0; while(read(0, in, 4)) { count = in[0]; color = in[1]; total += count; outR = from565_r(color); outG = from565_g(color); outB = from565_b(color); for (times=0;times<count;times++) { write(1, &outR, 1); write(1, &outG, 1); write(1, &outB, 1); } } fprintf(stderr,"%d pixels\n",total); }
void to_565_raw_dither(int width) { unsigned char in[3]; unsigned short out; int i = 0; int e; int* error = (int *) malloc((width+2) * 3 * sizeof(int)); int* next_error = (int *) malloc((width+2) * 3 * sizeof(int)); memset(error, 0, (width+2) * 3 * sizeof(int)); memset(next_error, 0, (width+2) * 3 * sizeof(int)); error += 3; // array goes from [-3..((width+1)*3+2)] next_error += 3; while(read(0, in, 3) == 3) { int r = in[0] + error[i*3+0]; int rb = (r < 0) ? 0 : ((r > 255) ? 255 : r); int g = in[1] + error[i*3+1]; int gb = (g < 0) ? 0 : ((g > 255) ? 255 : g); int b = in[2] + error[i*3+2]; int bb = (b < 0) ? 0 : ((b > 255) ? 255 : b); out = to565(rb, gb, bb); write(1, &out, 2); #define apply_error(ch) { \ next_error[(i-1)*3+ch] += e * 3 / 16; \ next_error[(i)*3+ch] += e * 5 / 16; \ next_error[(i+1)*3+ch] += e * 1 / 16; \ error[(i+1)*3+ch] += e - ((e*1/16) + (e*3/16) + (e*5/16)); \ } e = r - from565_r(out); apply_error(0); e = g - from565_g(out); apply_error(1); e = b - from565_b(out); apply_error(2); #undef apply_error ++i; if (i == width) { // error <- next_error; next_error <- 0 int* temp = error; error = next_error; next_error = temp; memset(next_error, 0, (width+1) * 3 * sizeof(int)); i = 0; } } free(error-3); free(next_error-3); return; }
void from_565_raw(void) { unsigned short out; unsigned short in; while(read(0, &in, 2) == 2) { out = from565_r(in); write(1, &out, 1); out = from565_g(in); write(1, &out, 1); out = from565_b(in); write(1, &out, 1); } return; }