From a35e5a48a8cf2e349cd16566952d1df2322a8d7f Mon Sep 17 00:00:00 2001 From: KaarlisCaune Date: Tue, 30 Jan 2024 20:40:02 +0200 Subject: [PATCH 1/3] Add alpha premultiplication steps before and after resize --- lib/jekyll_picture_tag/images/image_file.rb | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/jekyll_picture_tag/images/image_file.rb b/lib/jekyll_picture_tag/images/image_file.rb index 1052a66c..06e69c62 100644 --- a/lib/jekyll_picture_tag/images/image_file.rb +++ b/lib/jekyll_picture_tag/images/image_file.rb @@ -86,7 +86,9 @@ def notify end def resize(image) + image.premultiply image.resize(scale_value) + image.unpremultiply end def crop(image) From 3a9bc30d46a669199ff2a9c1e7454f467aa23ba9 Mon Sep 17 00:00:00 2001 From: KaarlisCaune Date: Tue, 6 Feb 2024 10:19:58 +0200 Subject: [PATCH 2/3] Only premultiply if image has alpha --- lib/jekyll_picture_tag/images/image_file.rb | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/lib/jekyll_picture_tag/images/image_file.rb b/lib/jekyll_picture_tag/images/image_file.rb index 06e69c62..40e1263c 100644 --- a/lib/jekyll_picture_tag/images/image_file.rb +++ b/lib/jekyll_picture_tag/images/image_file.rb @@ -86,9 +86,13 @@ def notify end def resize(image) - image.premultiply - image.resize(scale_value) - image.unpremultiply + if image.has_alpha? + image.premultiply + image.resize(scale_value) + image.unpremultiply + else + image.resize(scale_value) + end end def crop(image) From ef544cde14e45cc773c98257e3b64bc14dda2ab4 Mon Sep 17 00:00:00 2001 From: KaarlisCaune Date: Sun, 18 Feb 2024 10:29:59 +0200 Subject: [PATCH 3/3] Fix transparent images not being resized, add test --- lib/jekyll_picture_tag/images/image_file.rb | 4 ++-- test/image_files/pestka_transparent.png | Bin 0 -> 14028 bytes test/unit/images/test_image_file.rb | 9 +++++++++ 3 files changed, 11 insertions(+), 2 deletions(-) create mode 100644 test/image_files/pestka_transparent.png diff --git a/lib/jekyll_picture_tag/images/image_file.rb b/lib/jekyll_picture_tag/images/image_file.rb index 40e1263c..c23198d8 100644 --- a/lib/jekyll_picture_tag/images/image_file.rb +++ b/lib/jekyll_picture_tag/images/image_file.rb @@ -87,8 +87,8 @@ def notify def resize(image) if image.has_alpha? - image.premultiply - image.resize(scale_value) + image = image.premultiply + image = image.resize(scale_value) image.unpremultiply else image.resize(scale_value) diff --git a/test/image_files/pestka_transparent.png b/test/image_files/pestka_transparent.png new file mode 100644 index 0000000000000000000000000000000000000000..bed2da81de51b2ecfa3674f0dd1c4ce64d756fd4 GIT binary patch literal 14028 zcma)iRZ|@d&n?czU5XWVFYfM8+})jxyE_!O7I$}d-#8R^cX!xW;XLp63(iH7nOtR7 zGD#*`(aK8FD2N1z5D*Y3vN95?|5@|@2>|Xt4ct#t|IZ)*WprF2AebrsCy-tx!X6M1 zq!6+aqUv6TS2^Cl4qtV)cRFvXZtO~ZuYE0V(pKPn@d)jS%*^`H>7X_SsO12t)QzN& znBlY-&SGKr(wLYs`>RldQHthMCPel(Z>t8rbsc3^K5xBMofo}T_ujpn;^-?^db<%HW;Ae;}tPRo{Don_PVhG?w|ZRtmkfD^I2xhnX6S 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zeSQHN1OC|*m_$6c^lH3UAI1`<rEp^U{k}RcP4jIf%Pw3m!h83*TknnEy3O-AEvYEasi>N87|=3(Dv^rgbc z+*Veva6g?~^p~UehQ2uKy>UYZJGwI>CWUiwl!}DP`}*Guk@hfCxyG;i55C(xWRuvI w^J;lJ%`clcf%n4=UF)bTy2P9lzJC$Y=~tT(9rBy}cYcPDl~j_b6*CU`e|6twi~s-t literal 0 HcmV?d00001 diff --git a/test/unit/images/test_image_file.rb b/test/unit/images/test_image_file.rb index c9daad53..9de495f1 100644 --- a/test/unit/images/test_image_file.rb +++ b/test/unit/images/test_image_file.rb @@ -129,6 +129,15 @@ def test_resize assert_equal(10, width) end + def test_resize_with_alpha + restub_source('pestka_transparent', 'png') + tested + + width = Vips::Image.new_from_file(filename).width + + assert_equal(10, width) + end + def test_quality # We have to use slightly larger images for the quality to make a difference # in file size.