[MERGE] forward port of branch 8.0 up to e883193

1 files changed, 44 insertions, 7 deletions

diff --git a/openerp/tools/image.py b/openerp/tools/image.py
index 93458fb9408..aa110d7825e 100644
--- a/openerp/tools/image.py
+++ b/openerp/tools/image.py
@@ -88,13 +88,7 @@ def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', file
         return base64_source
 
     if image.size != size:
-        # create a thumbnail: will resize and keep ratios, then sharpen for better looking result
-        image.thumbnail(size, Image.ANTIALIAS)
-        sharpener = ImageEnhance.Sharpness(image.convert('RGBA'))
-        resized_image = sharpener.enhance(2.0)
-        # create a transparent image for background and paste the image on it
-        image = Image.new('RGBA', size, (255, 255, 255, 0))
-        image.paste(resized_image, ((size[0] - resized_image.size[0]) / 2, (size[1] - resized_image.size[1]) / 2))
+        image = image_resize_and_sharpen(image, size)
     if image.mode not in ["1", "L", "P", "RGB", "RGBA"]:
         image = image.convert("RGB")
 
@@ -102,6 +96,49 @@ def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', file
     image.save(background_stream, filetype)
     return background_stream.getvalue().encode(encoding)
 
+def image_resize_and_sharpen(image, size, factor=2.0):
+    """
+        Create a thumbnail by resizing while keeping ratio.
+        A sharpen filter is applied for a better looking result.
+
+        :param image: PIL.Image.Image()
+        :param size: 2-tuple(width, height)
+        :param factor: Sharpen factor (default: 2.0)
+    """
+    if image.mode != 'RGBA':
+        image = image.convert('RGBA')
+    image.thumbnail(size, Image.ANTIALIAS)
+    size = image.size
+    sharpener = ImageEnhance.Sharpness(image)
+    resized_image = sharpener.enhance(factor)
+    # create a transparent image for background and paste the image on it
+    image = Image.new('RGBA', size, (255, 255, 255, 0))
+    image.paste(resized_image, ((size[0] - resized_image.size[0]) / 2, (size[1] - resized_image.size[1]) / 2))
+    return image
+
+def image_save_for_web(image, fp=None, format=None):
+    """
+        Save image optimized for web usage.
+
+        :param image: PIL.Image.Image()
+        :param fp: File name or file object. If not specified, a bytestring is returned.
+        :param format: File format if could not be deduced from image.
+    """
+    opt = dict(format=image.format or format)
+    if image.format == 'PNG':
+        opt.update(optimize=True)
+        if image.mode != 'P':
+            # Floyd Steinberg dithering by default
+            image = image.convert('RGBA').convert('P', palette=Image.WEB, colors=256)
+    elif image.format == 'JPEG':
+        opt.update(optimize=True, quality=80)
+    if fp:
+        image.save(fp, **opt)
+    else:
+        img = StringIO.StringIO()
+        image.save(img, **opt)
+        return img.getvalue()
+
 def image_resize_image_big(base64_source, size=(1204, 1024), encoding='base64', filetype=None, avoid_if_small=True):
     """ Wrapper on image_resize_image, to resize images larger than the standard
         'big' image size: 1024x1024px.