From 465afd07bca22ee859d4a2faec62cff32866eaa6 Mon Sep 17 00:00:00 2001
From: Guillaume Ayoub <guillaume@courtbouillon.org>
Date: Tue, 12 Nov 2024 11:36:38 +0100
Subject: [PATCH] =?UTF-8?q?Set=20alpha=20even=20when=20current=20color=20c?=
 =?UTF-8?q?hannels=20didn=E2=80=99t=20change?=
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Content-Type: text/plain; charset=UTF-8
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Fix #2302.
---
 tests/draw/test_opacity.py | 9 +++++++++
 weasyprint/pdf/stream.py   | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/draw/test_opacity.py b/tests/draw/test_opacity.py
index 3d56665ad..bab36ffdd 100644
--- a/tests/draw/test_opacity.py
+++ b/tests/draw/test_opacity.py
@@ -58,3 +58,12 @@ def test_opacity_percent_clamp_up(assert_same_renderings):
         opacity_source % '<div></div><div style="opacity: -0.2"></div>',
         opacity_source % '<div></div><div style="opacity: -20%"></div>',
     )
+
+
+@assert_no_logs
+def test_opacity_black(assert_same_renderings):
+    # Regression test for https://github.com/Kozea/WeasyPrint/issues/2302
+    assert_same_renderings(
+        opacity_source % 'a<span style="color: rgb(0, 0, 0, 0.5)">b</span>',
+        opacity_source % 'a<span style="opacity: 0.5">b</span>',
+    )
diff --git a/weasyprint/pdf/stream.py b/weasyprint/pdf/stream.py
index ec3274a9d..8a0aa09a8 100644
--- a/weasyprint/pdf/stream.py
+++ b/weasyprint/pdf/stream.py
@@ -81,6 +81,8 @@ def end_text(self):
 
     def set_color(self, color, stroke=False):
         *channels, alpha = color
+        self.set_alpha(alpha, stroke)
+
         if stroke:
             if (color.space, *channels) == self._current_color_stroke:
                 return
@@ -105,7 +107,6 @@ def set_color(self, color, stroke=False):
         else:
             LOGGER.warn('Unsupported color space %s, use sRGB instead', color.space)
             self.set_color_rgb(*channels, stroke)
-        self.set_alpha(alpha, stroke)
 
     def set_font_size(self, font, size):
         if (font, size) == self._current_font: