photomosaics

commit 6ed152d8d2dfc6bf770fe2cbd5991380314abc20
parent f1e77825b2929213aa2cab7cdefe5a188582ea32
Author: Wilson Gheen <wilson@wilsonrgheen.com>
Date:   Mon, 26 Dec 2022 05:54:02 -0600

Add some functions for examining images, and one to squash an image into a blurrier version of itself

Diffstat:
M
photomosaics.c
 | 
128
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------

1 file changed, 98 insertions(+), 30 deletions(-)
diff --git a/photomosaics.c b/photomosaics.c
@@ -5,19 +5,21 @@
 #include <time.h>
 #include <MagickCore/MagickCore.h>
 
-void resize_image(Image *images, ImageInfo *image_info, float resize_factor, char *new_filename, ExceptionInfo *exception) {
-    Image *image, *resize_image;
+typedef struct {
+    int r, g, b;
+} Pixel;
+
+void resize_image(Image *image, ImageInfo *image_info, float resize_factor, char *new_filename, ExceptionInfo *exception) {
+    Image *resize_image;
     Image *thumbnails = NewImageList();
-    while((image=RemoveFirstImageFromList(&images))) {
-        int new_width  = image->columns * resize_factor;
-        int new_height = image->rows * resize_factor;
-        resize_image = ResizeImage(image, new_width, new_height, LanczosFilter, exception);
-        printf("%zu x %zu\n", resize_image->columns, resize_image->rows);
-        if(!resize_image)
-            MagickError(exception->severity, exception->reason, exception->description);
-        AppendImageToList(&thumbnails, resize_image);
-        DestroyImage(image);
-    }
+    int new_width  = image->columns * resize_factor;
+    int new_height = image->rows * resize_factor;
+    resize_image = ResizeImage(image, new_width, new_height, LanczosFilter, exception);
+    printf("%zu x %zu\n", resize_image->columns, resize_image->rows);
+    if(!resize_image)
+        MagickError(exception->severity, exception->reason, exception->description);
+    AppendImageToList(&thumbnails, resize_image);
+    DestroyImage(image);
 
     strcpy(thumbnails->filename, new_filename);
     WriteImage(image_info, thumbnails, exception);
@@ -25,26 +27,78 @@ void resize_image(Image *images, ImageInfo *image_info, float resize_factor, cha
     DestroyImageList(thumbnails);
 }
 
-int main(int argc, char **argv) {
-    ExceptionInfo *exception;
-    Image *images;
-    ImageInfo *image_info;
-    float resize_factor = 0.0;
-    char *endptr;
-    if(argc == 4) {
-        const char *old_locale = setlocale(LC_ALL, NULL);
-        setlocale(LC_ALL|~LC_NUMERIC, "");
-        resize_factor = strtof(argv[3], &endptr);
-        setlocale(LC_ALL, old_locale);
+void print_pixel_info(Image *image, int x, int y, ExceptionInfo *exception) {
+    unsigned char pixels[3];
+    char *map = "RGB";
+    if(ExportImagePixels(image, x, y, 1, 1, map, CharPixel, pixels, exception))
+        printf("RGB: %d, %d, %d\n", pixels[0], pixels[1], pixels[2]);
+/*        printf("RGB: 0x%02hhx, 0x%02hhx, 0x%02hhx\n", pixels[0], pixels[1], pixels[2]);*/
+}
+
+Pixel get_avg_color(Image *image, unsigned int x, int y, int width, int height, ExceptionInfo *exception) {
+    unsigned char *pixels = malloc(width * height * 3);
+    char *map = "RGB";
+    Pixel p = {0};
+    if(!ExportImagePixels(image, x, y, width, height, map, CharPixel, pixels, exception)) {
+        free(pixels);
+        exit(1);
     }
-    if(argc < 4 || !strncmp(argv[3], endptr, strlen(argv[3])) || resize_factor < 0.0) {
-        fprintf(stderr, "Usage: %s old_image new_image resize_factor\n", argv[0]);
-        exit(2);
+    for(int i=0; i < width*height*3; i+=3) {
+        p.r += pixels[i];
+        p.g += pixels[i+1];
+        p.b += pixels[i+2];
     }
-    if(resize_factor > 10.0) {
-        fprintf(stderr, "resize_factor %.1f is too big. Please don't break my computer.\n", resize_factor);
-        exit(1);
+    free(pixels);
+
+    p.r /= width*height;
+    p.g /= width*height;
+    p.b /= width*height;
+    return p;
+}
+
+void print_avg_color(Image *image, unsigned int x, int y, int width, int height, ExceptionInfo *exception) {
+    Pixel p = get_avg_color(image, x, y, width, height, exception);
+    printf("RGB: %d, %d, %d\n", p.r, p.g, p.b);
+}
+
+Image *make_img_avg_colors(Image *image, const ssize_t first_x, const ssize_t first_y, const size_t each_width, const size_t each_height, ExceptionInfo *exception) {
+    unsigned char *ps = malloc((image->columns / each_width) * (image->rows / each_height) * 3);
+    char *map = "RGB";
+    int i = 0;
+    for(size_t y=first_y; y < image->rows; y+=each_height, i+=3) {
+        for(size_t x=first_x; x < image->columns; x+=each_width, i+=3) {
+            Pixel p = get_avg_color(image, x, y, each_width, each_height, exception);
+            ps[i] = p.r;
+            ps[i+1] = p.g;
+            ps[i+2] = p.b;
+        }
     }
+    Image *new_image = ConstituteImage(image->columns / each_width, image->rows / each_height, map, CharPixel, ps, exception);
+    if(!new_image)
+        exit(1);
+    return new_image;
+}
+
+int main(int argc, char **argv) {
+    ExceptionInfo *exception;
+    Image *images, *image;
+    ImageInfo *image_info;
+/*    float resize_factor = 0.0;*/
+/*    char *endptr;*/
+/*    if(argc == 4) {*/
+/*        const char *old_locale = setlocale(LC_ALL, NULL);*/
+/*        setlocale(LC_ALL|~LC_NUMERIC, "");*/
+/*        resize_factor = strtof(argv[3], &endptr);*/
+/*        setlocale(LC_ALL, old_locale);*/
+/*    }*/
+/*    if(argc < 4 || !strncmp(argv[3], endptr, strlen(argv[3])) || resize_factor < 0.0) {*/
+/*        fprintf(stderr, "Usage: %s old_image new_image resize_factor\n", argv[0]);*/
+/*        exit(2);*/
+/*    }*/
+/*    if(resize_factor > 10.0) {*/
+/*        fprintf(stderr, "resize_factor %.1f is too big. Please don't break my computer.\n", resize_factor);*/
+/*        exit(1);*/
+/*    }*/
 
     MagickCoreGenesis(*argv, MagickTrue);
     exception = AcquireExceptionInfo();
@@ -55,9 +109,23 @@ int main(int argc, char **argv) {
         CatchException(exception);
     if(!images)
         exit(1);
-    resize_image(images, image_info, resize_factor, argv[2], exception);
+    image=RemoveFirstImageFromList(&images);
+    if(!image)
+        exit(1);
+/*    resize_image(image, image_info, resize_factor, argv[2], exception);*/
+/*    for(unsigned int i=0; i < image->columns; i++)*/
+/*        print_pixel_info(image, i, 0, exception);*/
+/*    for(unsigned int i=0; i < image->columns; i++)*/
+/*        print_avg_color(image, i, 0, 1, 1, exception);*/
+    Image *new_image = make_img_avg_colors(image, 0, 0, 100, 100, exception);
+    ImageInfo *new_image_info = CloneImageInfo((ImageInfo *)NULL);
+    strcpy(new_image->filename, argv[2]);
+    WriteImage(new_image_info, new_image, exception);
 
+    DestroyImage(image);
+    DestroyImage(new_image);
     DestroyImageInfo(image_info);
+    DestroyImageInfo(new_image_info);
     DestroyExceptionInfo(exception);
     MagickCoreTerminus();
     return 0;