performance improvements

images/images.c

@@ -35,10 +35,7 @@ int image_new(int width, int height, Image* img) {
     // initialize bitmap...
     img->bitmap = malloc(height * sizeof(int*));
     for (int i = 0; i < height; i++) {
-        img->bitmap[i] = malloc(width * sizeof(int*));
-        for (int j = 0; j < width; j++) {
-            img->bitmap[i][j] = malloc(3 * sizeof(int));
-        }
+        img->bitmap[i] = malloc(3 * width * sizeof(int));
     }
 
     //*image = *img;
@@ -93,10 +90,10 @@ int image_save(Image* image, char* path) {
     int line;
     for (line = 0; line < image->height; line++) {
         byte_pos = 0;
-        for (int px = 0; px < image->width; px++) {
-            bytes[byte_offset + byte_pos++] = image->bitmap[line][px][2];
-            bytes[byte_offset + byte_pos++] = image->bitmap[line][px][1];
-            bytes[byte_offset + byte_pos++] = image->bitmap[line][px][0];
+        for (int px = 0; px < image->width * 3; px += 3) {
+            bytes[byte_offset + byte_pos++] = image->bitmap[line][px + 2];
+            bytes[byte_offset + byte_pos++] = image->bitmap[line][px + 1];
+            bytes[byte_offset + byte_pos++] = image->bitmap[line][px + 0];
         }
         byte_offset += align_to_four_bytes(byte_pos);
     }
@@ -114,9 +111,18 @@ int image_save(Image* image, char* path) {
 int image_set_px(Image* image, int x, int y, int r, int g, int b) {
     if (!image_check_coords(image, x, y)) return 0;
 
-    image->bitmap[y][x][0] = (char) r;
-    image->bitmap[y][x][1] = (char) g;
-    image->bitmap[y][x][2] = (char) b;
+    image->bitmap[y][(3 * x) + 0] = (char) r;
+    image->bitmap[y][(3 * x) + 1] = (char) g;
+    image->bitmap[y][(3 * x) + 2] = (char) b;
+
+    return 1;
+}
+int image_set_px_c(Image* image, int x, int y, Color* color) {
+    if (!image_check_coords(image, x, y)) return 0;
+
+    image->bitmap[y][(3 * x) + 0] = (char) color->r;
+    image->bitmap[y][(3 * x) + 1] = (char) color->g;
+    image->bitmap[y][(3 * x) + 2] = (char) color->b;
 
     return 1;
 }
@@ -128,9 +134,6 @@ int image_check_coords(Image* image, int x, int y) {
 
 int image_destroy(Image* image) {
     for (int i = 0; i < image->height; i++) {
-        for (int j = 0; j < image->width; j++) {
-            free(image->bitmap[i][j]);
-        }
         free(image->bitmap[i]);
     }
     free(image->bitmap);
@@ -138,3 +141,26 @@ int image_destroy(Image* image) {
     return 1;
 }
 
+
+///////// Colors
+
+Color* color_new(int r, int g, int b) {
+    Color* c = malloc(sizeof(Color));
+    c->r = r;
+    c->g = g;
+    c->b = b;
+    return c;
+}
+
+int image_draw_rect(Image* image, int x1, int y1, int x2, int y2, Color* color) {
+    int retval = 1;
+    int y;
+    for (; x1 < x2; x1++) {
+        for (y = y1; y < y2; y++) {
+            if (!image_set_px_c(image, x1, y, color)) retval = 0;
+        }
+    }
+
+    return retval;
+}
+

images/images.h

@@ -1,8 +1,14 @@
 #ifndef IMAGES_H
 #define IMAGES_H
 
+typedef struct _color {
+    char r;
+    char g;
+    char b;
+} Color;
+
 typedef struct _image {
-    char*** bitmap;
+    char** bitmap;
     int width;
     int height;
 } Image;
@@ -12,6 +18,7 @@ int image_new(int width, int height, Image* image);
 int image_save(Image* image, char* path);
 
 int image_set_px(Image* image, int x, int y, int r, int g, int b);
+int image_set_px_c(Image* image, int x, int y, Color* color);
 
 int image_check_coords(Image* image, int x, int y);
 
@@ -19,6 +26,13 @@ int image_destroy(Image* image);
 
 int image_byte_size(Image *image);
 
+
+int image_draw_rect(Image* image, int x1, int y1, int x2, int y2, Color* color);
+
+
+
+Color* color_new(int r, int g, int b);
+
 #include "images.c"
 
 #endif

main.c

@@ -5,20 +5,22 @@
 int main(int argc, char* argv[]) {
 
     Image img;
-    image_new(255,255, &img);
+    image_new(512,512, &img);
 
-    int r,g,b;
+    Color* green = color_new(0,255,0);
+    Color* purple = color_new(125,17,249);
+
+    image_draw_rect(&img, 255, 0, 512, 255, green);
+    image_draw_rect(&img, 0, 255, 255, 512, purple);
 
     for (int i = 0; i < 255; i++) {
         for (int j = 0; j < 255; j++) {
-            double factor = (i*i + j*j) / (100*100);
-            r = i;
-            g = 255 -j;
-            b = i -255;
-
-
-            image_set_px(&img, i, j, factor * r, factor * g, factor * b);
-
+            image_set_px(&img, i, j, i, 0, 0);
+        }
+    }
+    for (int i = 0; i <= 256; i++) {
+        for (int j = 0; j <= 256; j++) {
+            image_set_px(&img, i + 255, j + 255, j, j, 255);
         }
     }
 
@@ -30,4 +32,7 @@ int main(int argc, char* argv[]) {
         printf("Wrote file successfully\n");
     }
     image_destroy(&img);
+
+    free(green);
+    free(purple);
 }