Expose gaussian_sharpen()

src/calibre/utils/imageops/imageops.cpp

@@ -266,7 +266,7 @@ int default_convolve_matrix_size(const float radius, const float sigma, const bo
 
 // }}}
 
-QImage gaussian_sharpen(const QImage &img, const float radius, const float sigma, const bool high_quality=true) {
+QImage gaussian_sharpen(const QImage &img, const float radius, const float sigma, const bool high_quality) {
     int matrix_size = default_convolve_matrix_size(radius, sigma, high_quality);
     int len = matrix_size*matrix_size;
     float alpha, *matrix = new float[len];

src/calibre/utils/imageops/imageops.h

@@ -12,4 +12,5 @@
 
 QImage remove_borders(const QImage &image, double fuzz);
 QImage grayscale(const QImage &image);
+QImage gaussian_sharpen(const QImage &img, const float radius, const float sigma, const bool high_quality=true);
 

src/calibre/utils/imageops/imageops.sip

@@ -31,3 +31,10 @@ QImage* grayscale(const QImage &image);
 			ans = grayscale(*a0);
         IMAGEOPS_SUFFIX
 %End
+
+QImage gaussian_sharpen(const QImage &img, const float radius, const float sigma, const bool high_quality=true);
+%MethodCode
+        IMAGEOPS_PREFIX
+			ans = gaussian_sharpen(*a0, a1, a2, a3);
+        IMAGEOPS_SUFFIX
+%End

src/calibre/utils/img.py

@@ -217,6 +217,11 @@ def remove_borders(img, fuzz=None):
     ans = imageops.remove_borders(image_from_data(img), max(0, fuzz))
     return ans if ans.size() != img.size() else img
 
+def gaussian_sharpen(img, radius=0, sigma=3, high_quality=True):
+    if imageops is None:
+        raise RuntimeError(imageops_err)
+    return imageops.gaussian_sharpen(image_from_data(img), max(0, radius), sigma, high_quality)
+
 def run_optimizer(file_path, cmd, as_filter=False, input_data=None):
     file_path = os.path.abspath(file_path)
     cwd = os.path.dirname(file_path)