image-rs · RunDevelopment · Jun 26, 2026 · Jun 25, 2026
diff --git a/tests/images/png/apng/wpt/LICENSE.md b/tests/images/png/apng/wpt/LICENSE.md
@@ -0,0 +1,11 @@
+# The 3-Clause BSD License
+
+Copyright © web-platform-tests contributors
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/tests/images/png/apng/wpt/README.txt b/tests/images/png/apng/wpt/README.txt
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+APNG dispose/blend reference tests copied or derived from Web Platform Tests.
+
+WPT source: https://github.com/web-platform-tests/wpt/tree/b63305b743ed9ce2725d4ae09c5c8f0c40d8e6e1/png/apng
+
+Credits:
+- Chris Lilley, main author of the WPT PNG/APNG tests.
+- Philip Taylor, author of the earlier APNG testsuite that many WPT APNG tests
+  were ported from.
+
+These files cover all APNG dispose/blend operation combinations:
+
+WPT files copied as-is:
+- support/013.png -> fcTL-dispose-in-region-none.png
+- support/015.png -> fcTL-dispose-in-region-background.png
+- support/016.png -> fcTL-dispose-in-region-previous.png
+- support/018.png -> fcTL-blend-source-transparent.png
+
+The current WPT APNG files cover none+over, none+source, background+over, and
+previous+over. The background+source and previous+source combinations do not
+exist in WPT, so these two files are derived:
+
+- dispose-background-blend-source.png
+- dispose-previous-blend-source.png
+
+The derived files are minimal 3x1 APNGs. Each has an opaque red base frame, a
+half-transparent target frame using the dispose/blend operation named by the
+file, and a marker frame that makes the target frame's disposal result visible.
+
+The reference frames in tests/reference/png/apng/wpt/ were generated with APNG
+Disassembler 2.9 (apngdis), independently of this crate's PNG decoder.
diff --git a/tests/images/png/apng/wpt/dispose-background-blend-source.png b/tests/images/png/apng/wpt/dispose-background-blend-source.png
diff --git a/tests/images/png/apng/wpt/dispose-previous-blend-source.png b/tests/images/png/apng/wpt/dispose-previous-blend-source.png
diff --git a/tests/images/png/apng/wpt/fcTL-blend-source-transparent.png b/tests/images/png/apng/wpt/fcTL-blend-source-transparent.png
diff --git a/tests/images/png/apng/wpt/fcTL-dispose-in-region-background.png b/tests/images/png/apng/wpt/fcTL-dispose-in-region-background.png
diff --git a/tests/images/png/apng/wpt/fcTL-dispose-in-region-none.png b/tests/images/png/apng/wpt/fcTL-dispose-in-region-none.png
diff --git a/tests/images/png/apng/wpt/fcTL-dispose-in-region-previous.png b/tests/images/png/apng/wpt/fcTL-dispose-in-region-previous.png
diff --git a/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_01.png b/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_02.png b/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_03.png b/tests/reference/png/apng/wpt/dispose-background-blend-source.png.anim_03.png
diff --git a/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_01.png b/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_02.png b/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_03.png b/tests/reference/png/apng/wpt/dispose-previous-blend-source.png.anim_03.png
diff --git a/tests/reference/png/apng/wpt/fcTL-blend-source-transparent.png.anim_01.png b/tests/reference/png/apng/wpt/fcTL-blend-source-transparent.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/fcTL-blend-source-transparent.png.anim_02.png b/tests/reference/png/apng/wpt/fcTL-blend-source-transparent.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_01.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_02.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_03.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-background.png.anim_03.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_01.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_02.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_03.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-none.png.anim_03.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_01.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_01.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_02.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_02.png
diff --git a/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_03.png b/tests/reference/png/apng/wpt/fcTL-dispose-in-region-previous.png.anim_03.png