Introduce new "fixed" thumbnail crop mode

This mode retains given aspect ratio and crops the area from inside of the
source image.

1 files changed, 29 insertions, 11 deletions

diff --git a/src/jpeg-utils.cpp b/src/jpeg-utils.cpp
index a552e69..e714778 100644
--- a/src/jpeg-utils.cpp
+++ b/src/jpeg-utils.cpp
@@ -458,9 +458,9 @@ resize_image (const gchar *src, const gchar *dst,
 {
   MagickWand *magick_wand;
   ExceptionType severity;
-  unsigned long w;
-  unsigned long h;
-  unsigned long amount;
+  unsigned long w, h;
+  unsigned long new_w, new_h;
+  double source_aspect, target_aspect;
   gchar *description;
 
   /*  Read an image.  */
@@ -481,27 +481,45 @@ resize_image (const gchar *src, const gchar *dst,
   {
     /*  Process thumbnail if required  */
     if (thumbnail) {
-      if (exif->squared_thumbnail) {
+      if (exif->thumbnail_crop_style != CROP_STYLE_NORMAL) {
         w = MagickGetImageWidth (magick_wand);
         h = MagickGetImageHeight (magick_wand);
-        amount = MAX (w, h) * SQUARED_SIMPLE_SHAVE_AMOUNT / 100;
-        amount = MIN (w - 2*amount, h - 2*amount);
+        new_w = w;
+        new_h = h;
+        if (exif->thumbnail_crop_style == CROP_STYLE_SQUARED) {
+          new_w = MAX (w, h) * CROP_SIMPLE_SHAVE_AMOUNT / 100;
+          new_w = MIN (w - 2*new_w, h - 2*new_w);
+          new_h = new_w;
+        }
+        if (exif->thumbnail_crop_style == CROP_STYLE_FIXED) {
+          source_aspect = (double) w / (double) h;
+          target_aspect = (double) size_x / (double) size_y;
+          if (target_aspect >= source_aspect) {
+            new_w = w;
+            new_h = (int) ((double) w / target_aspect);
+          } else {
+            new_w = (int) ((double) h * target_aspect);
+            new_h = h;
+          }
+          new_w = (int) ((double) new_w * (double) (100 - CROP_SIMPLE_SHAVE_AMOUNT) / 100);
+          new_h = (int) ((double) new_h * (double) (100 - CROP_SIMPLE_SHAVE_AMOUNT) / 100);
+        }
         switch (exif->thumbnail_crop_hint) {
           case CROP_HINT_UNDEFINED:
           case CROP_HINT_CENTER:
-            MagickCropImage (magick_wand, amount, amount, (w - amount) / 2, (h - amount) / 2);
+            MagickCropImage (magick_wand, new_w, new_h, (w - new_w) / 2, (h - new_h) / 2);
             break;
           case CROP_HINT_LEFT:
-            MagickCropImage (magick_wand, amount, amount, 0, (h - amount) / 2);
+            MagickCropImage (magick_wand, new_w, new_h, 0, (h - new_h) / 2);
             break;
           case CROP_HINT_RIGHT:
-            MagickCropImage (magick_wand, amount, amount, w - amount, (h - amount) / 2);
+            MagickCropImage (magick_wand, new_w, new_h, w - new_w, (h - new_h) / 2);
             break;
           case CROP_HINT_TOP:
-            MagickCropImage (magick_wand, amount, amount, (w - amount) / 2, 0);
+            MagickCropImage (magick_wand, new_w, new_h, (w - new_w) / 2, 0);
             break;
           case CROP_HINT_BOTTOM:
-            MagickCropImage (magick_wand, amount, amount, (w - amount) / 2, h - amount);
+            MagickCropImage (magick_wand, new_w, new_h, (w - new_w) / 2, h - new_h);
             break;
         }
       }