margen v1.1.0

* fix: monochrome

* update doc

* update doc

Makefile

@@ -33,3 +33,12 @@ release: clean build time
 		git commit -m "$(TARGET) v$$VERSION"; \
 		git tag v$$VERSION -m "$(TARGET) v$$VERSION"
 	@echo updated ./src/const.h and tagged version
+
+.PHONY: gif
+gif: build
+	mkdir -p tmp
+	for i in {1..50}; do \
+		./build/margen -w=1920 -h=720 --seed=$$i$$i -o=tmp/image$$i.bmp ; \
+	done
+	ffmpeg -y -f image2 -framerate 1 -i tmp/image%d.bmp -vf scale=960x360 images/sample.gif
+	rm -rf tmp

README.md

@@ -2,7 +2,9 @@
 
 > generate a marble-like pattern bitmap image, blazing fast.
 
-![](./images/sample1.bmp)
+<p align="center">
+  <img width="960" height="360" src="./images/sample.gif">
+</p>
 
 Written in pure C without librairies.
 
@@ -20,7 +22,7 @@ make clean build install
 ## CLI arguments
 
 ```txt
-usage: margen [--help] [-q] [-w=WIDTH] [-h=HEIGHT] [-o=PATH] [--seed=SEED][-p=PIXEL_SIZE] [-s=SLOPE] [-c=R,G,B] [-v=R,G,B] [-m]
+usage: margen [--help] [-v] [-q] [-w=WIDTH] [-h=HEIGHT] [-o=PATH] [--seed=SEED][-p=PIXEL_SIZE] [-s=SLOPE] [-c=R,G,B] [-va=R,G,B] [-vr=VAR_RANGE] [-r=ROTATION] [-m]
 
 generate a marble-like pattern bitmap image, blazing fast.
 
@@ -34,13 +36,12 @@ options:
   -p, --pixel        pixel size (default: random)
   -s, --slope        slope [0-255] (default: random)
   -c, --color        base color [0-255,0-255,0-255] (default: random)
-  -v, --variation    base variation [0-255,0-255,0-255] (default: random)
+  -va, --variation   fixed variation [0-255,0-255,0-255] (default: random)
+  -vr, --var-range   random variation range [0-255] (default: 30)
+  -r, --rotation     start corner rotation [0-3] (default: random)
+  -m, --monochrome   grayscale generation
 ```
 
 ## TODO
 
-- fix monochrome
-- select corner (currently bottom left)
-- better starting parameters for convergeance
-- add range arg for variation
-- add timer
+- configure, make, make install

src/args.c

@@ -20,8 +20,9 @@ void print_help(int status_code) {
        "[-p=PIXEL_SIZE] "
        "[-s=SLOPE] "
        "[-c=R,G,B] "
-       "[--var=R,G,B] "
-       "[-vr=VAR_RANGE]"
+       "[-va=R,G,B] "
+       "[-vr=VAR_RANGE] "
+       "[-r=ROTATION] "
        //  "[-m]"
        "\n\n"
        "generate a marble-like pattern bitmap image, blazing fast.\n\n"
@@ -38,8 +39,8 @@ void print_help(int status_code) {
        "  -va, --variation   fixed variation [0-255,0-255,0-255] (default: "
        "random)\n"
        "  -vr, --var-range   random variation range [0-255] (default: 30)\n"
-       //  "  -m, --monochrome   black & white generation\n"
-  );
+       "  -r, --rotation    start corner rotation [0-3] (default: random)\n"
+       "  -m, --monochrome   grayscale generation\n");
   exit(status_code);
 }
 
@@ -131,6 +132,7 @@ parameters parse_args(int argc, char **argv) {
   bool slope_set = false;
   bool start_set = false;
   bool var_set = false;
+  bool rot_set = false;
 
   int i;
   char *arg;
@@ -182,8 +184,11 @@ parameters parse_args(int argc, char **argv) {
       var_set = true;
     } else if (is_arg(arg, "-vr") || is_arg(arg, "--var-range")) {
       var_range = parse_char(arg, value);
-      // } else if (is_arg(arg, "-m") || is_arg(arg, "--monochrome")) {
-      //   params.monochrome = true;
+    } else if (is_arg(arg, "-r") || is_arg(arg, "--rotation")) {
+      params.rotation = parse_char(arg, value) % 4;
+      rot_set = true;
+    } else if (is_arg(arg, "-m") || is_arg(arg, "--monochrome")) {
+      params.monochrome = true;
     } else {
       invalid_arg(arg);
     }
@@ -216,5 +221,9 @@ parameters parse_args(int argc, char **argv) {
     params.var[2] = rand_uchar(var_range);
   }
 
+  if (!rot_set) {
+    params.rotation = rand_uchar(4);
+  }
+
   return params;
 }

src/bmp.c

@@ -32,23 +32,36 @@ unsigned char *bmp_header(unsigned short width, unsigned short height,
   unsigned char *output = (unsigned char *)malloc(HEADER_SIZE);
   unsigned int data_length = ((unsigned int)width) * ((unsigned int)height) *
                              ((unsigned int)color_depth);
-  write_str(output, 0x00, 0x02, (unsigned char *)"BM"); // 0x00(2) BM
-  write_num(output, 0x02, 0x04,
-            HEADER_SIZE + data_length);       // 0x02(4) file size
-  write_nul(output, 0x06, 0x04);              // 0x06(4) application reserved
-  write_num(output, 0x0A, 0x04, HEADER_SIZE); // 0x0A(4) data offset
-  write_num(output, 0x0E, 0x04, 40);          // 0x0E(4) DIB header size
-  write_num(output, 0x12, 0x04, width);       // 0x12(4) width
-  write_num(output, 0x16, 0x04, height);      // 0x16(4) height
-  write_num(output, 0x1A, 0x04, 1);           // 0x1A(2) color panes
-  write_num(output, 0x1C, 0x02, color_depth * 8); // 0x1C(2) bits per pixel
-  write_nul(output, 0x1E, 0x04); // 0x1E(4) BI_RGB, no compression
-  write_num(output, 0x22, 0x04,
-            data_length);              // 0x22(4) size of raw bitmap data
-  write_num(output, 0x26, 0x04, 2835); // 0x26(4) horizontal print resolution
-  write_num(output, 0x2A, 0x04, 2835); // 0x2A(4) vertical print resolution
-  write_nul(output, 0x2E, 0x04);       // 0x2E(4) color in palette
-  write_nul(output, 0x32, 0x04);       // 0x32(4) 0 important colors
+  // 0x00(2) BM
+  write_str(output, 0x00, 0x02, (unsigned char *)"BM");
+  // 0x02(4) file size
+  write_num(output, 0x02, 0x04, HEADER_SIZE + data_length);
+  // 0x06(4) application reserved
+  write_nul(output, 0x06, 0x04);
+  // 0x0A(4) data offset
+  write_num(output, 0x0A, 0x04, HEADER_SIZE);
+  // 0x0E(4) DIB header size
+  write_num(output, 0x0E, 0x04, 40);
+  // 0x12(4) width
+  write_num(output, 0x12, 0x04, width);
+  // 0x16(4) height
+  write_num(output, 0x16, 0x04, height);
+  // 0x1A(2) color panes
+  write_num(output, 0x1A, 0x04, 1);
+  // 0x1C(2) bits per pixel
+  write_num(output, 0x1C, 0x02, color_depth * 8);
+  // 0x1E(4) BI_RGB, no compression
+  write_nul(output, 0x1E, 0x04);
+  // 0x22(4) size of raw bitmap data
+  write_num(output, 0x22, 0x04, data_length);
+  // 0x26(4) horizontal print resolution
+  write_num(output, 0x26, 0x04, 2835);
+  // 0x2A(4) vertical print resolution
+  write_num(output, 0x2A, 0x04, 2835);
+  // 0x2E(4) color in palette (0)
+  write_nul(output, 0x2E, 0x04);
+  // 0x32(4) important colors (0)
+  write_nul(output, 0x32, 0x04);
 
   return output;
 }
@@ -75,7 +88,7 @@ void bmp_data_line(unsigned char *buffer, unsigned short width,
 }
 
 void bmp_generate(unsigned short width, unsigned short height,
-                  unsigned char color_depth, char *file_path,
+                  unsigned char color_depth, bool descending, char *file_path,
                   line_fn generate_line) {
   FILE *fptr;
   fptr = fopen(file_path, "w");
@@ -84,14 +97,17 @@ void bmp_generate(unsigned short width, unsigned short height,
   free(header);
   unsigned int data_length =
       ((unsigned int)width) * ((unsigned int)color_depth);
-  unsigned short y;
+  unsigned int line_length = bmp_data_line_length(width, color_depth);
   unsigned char *data_buffer = (unsigned char *)malloc(data_length);
-  unsigned char *line_buffer =
-      (unsigned char *)malloc(bmp_data_line_length(width, color_depth));
+  unsigned char *line_buffer = (unsigned char *)malloc(line_length);
+  unsigned short y;
   for (y = 0; y < height; y++) {
-    generate_line(height - y - 1, data_buffer, data_length);
+    generate_line(y, data_buffer, data_length);
     bmp_data_line(line_buffer, width, color_depth, data_buffer);
-    fwrite(line_buffer, bmp_data_line_length(width, color_depth), 1, fptr);
+    if (descending) {
+      fseek(fptr, HEADER_SIZE + (height - y - 1) * line_length, SEEK_SET);
+    }
+    fwrite(line_buffer, line_length, 1, fptr);
   }
   free(line_buffer);
   free(data_buffer);

src/bmp.h

@@ -4,7 +4,7 @@
 #define BMP_H
 
 void bmp_generate(unsigned short width, unsigned short height,
-                  unsigned char color_depth, char *file_path,
+                  unsigned char color_depth, bool descending, char *file_path,
                   line_fn generate_line);
 
 #endif

src/const.h

@@ -2,6 +2,6 @@
 #define CONST_H
 
 #define NAME "margen"
-#define VERSION "v1.0.2"
+#define VERSION "v1.1.0"
 
 #endif

src/generator.c

@@ -7,6 +7,8 @@
 #include <stdlib.h>
 #include <time.h>
 
+#define BMP_COLOR_DEPTH 3
+
 parameters global_params;
 float slope;
 unsigned char color_depth;
@@ -43,12 +45,13 @@ void generate_bmp_line(unsigned short y, unsigned char *data_buffer,
                        unsigned int len) {
   unsigned int i;
   unsigned int x;
-  if (y > 0 && (y % global_params.size) == 0) {
+  if (y % global_params.size == 0) {
     generate_line();
   }
   for (i = 0; i < len; i++) {
-    x = i / (color_depth * global_params.size);
-    data_buffer[i] = current_line[x * color_depth + (i % color_depth)];
+    x = i / (BMP_COLOR_DEPTH * global_params.size);
+    data_buffer[(global_params.rotation / 2) == 1 ? i : (len - i - 1)] =
+        current_line[x * color_depth + (i % color_depth)];
   }
 }
 
@@ -68,6 +71,7 @@ void debug_parameters(parameters params) {
       printf("  var.    %u,%u,%u\n", params.var[0], params.var[1],
              params.var[2]);
     }
+    printf("  rot.    %d\n", params.rotation);
   }
 }
 
@@ -84,7 +88,6 @@ void init(parameters params) {
     current_line[i] = params.start[i % color_depth];
   }
   set_seed(params.seed);
-  generate_line();
 }
 
 void clean() {
@@ -105,8 +108,8 @@ void generate(parameters params) {
   }
   clock_t start = clock();
   init(params);
-  bmp_generate(params.width, params.height, color_depth, params.file_path,
-               generate_bmp_line);
+  bmp_generate(params.width, params.height, BMP_COLOR_DEPTH,
+               params.rotation % 2 == 1, params.file_path, generate_bmp_line);
   clean();
   print_time(params, start);
 }

src/types.h

@@ -14,6 +14,7 @@ struct Parameters {
   unsigned char slope;
   unsigned char start[3];
   unsigned char var[3];
+  unsigned char rotation;
 };
 
 typedef struct Parameters parameters;