From 73c5010e4e85e593f2057653d1dd9c5c8cd3c816 Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Thu, 11 Jul 2024 20:43:47 +0200
Subject: [PATCH] render: fix sampling of transformed buffers with crop

---
 src/gfx_api.rs | 42 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/src/gfx_api.rs b/src/gfx_api.rs
index a36c9a4e..8611a357 100644
--- a/src/gfx_api.rs
+++ b/src/gfx_api.rs
@@ -72,13 +72,43 @@ impl SampleRect {
         let y2 = self.y2;
         match self.buffer_transform {
             None => [[x2, y1], [x1, y1], [x2, y2], [x1, y2]],
-            Rotate90 => [[y1, x1], [y1, x2], [y2, x1], [y2, x2]],
-            Rotate180 => [[x1, y2], [x2, y2], [x1, y1], [x2, y1]],
-            Rotate270 => [[y2, x2], [y2, x1], [y1, x2], [y1, x1]],
-            Flip => [[x1, y1], [x2, y1], [x1, y2], [x2, y2]],
+            Rotate90 => [
+                [y1, 1.0 - x2],
+                [y1, 1.0 - x1],
+                [y2, 1.0 - x2],
+                [y2, 1.0 - x1],
+            ],
+            Rotate180 => [
+                [1.0 - x2, 1.0 - y1],
+                [1.0 - x1, 1.0 - y1],
+                [1.0 - x2, 1.0 - y2],
+                [1.0 - x1, 1.0 - y2],
+            ],
+            Rotate270 => [
+                [1.0 - y1, x2],
+                [1.0 - y1, x1],
+                [1.0 - y2, x2],
+                [1.0 - y2, x1],
+            ],
+            Flip => [
+                [1.0 - x2, y1],
+                [1.0 - x1, y1],
+                [1.0 - x2, y2],
+                [1.0 - x1, y2],
+            ],
             FlipRotate90 => [[y1, x2], [y1, x1], [y2, x2], [y2, x1]],
-            FlipRotate180 => [[x2, y2], [x1, y2], [x2, y1], [x1, y1]],
-            FlipRotate270 => [[y2, x1], [y2, x2], [y1, x1], [y1, x2]],
+            FlipRotate180 => [
+                [x2, 1.0 - y1],
+                [x1, 1.0 - y1],
+                [x2, 1.0 - y2],
+                [x1, 1.0 - y2],
+            ],
+            FlipRotate270 => [
+                [1.0 - y1, 1.0 - x2],
+                [1.0 - y1, 1.0 - x1],
+                [1.0 - y2, 1.0 - x2],
+                [1.0 - y2, 1.0 - x1],
+            ],
         }
     }
 }