From 35fda58c33585cb6a6e0a77ce238957d862a7ee2 Mon Sep 17 00:00:00 2001
From: treeform <starplant@gmail.com>
Date: Sun, 7 Nov 2021 15:42:53 -0800
Subject: [PATCH] Fixed negative/flipped axis matrix drawing.
---
src/pixie/images.nim | 5 ++++-
tests/test_images.nim | 13 +++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/src/pixie/images.nim b/src/pixie/images.nim
index 0065b11..5d374cc 100644
--- a/src/pixie/images.nim
+++ b/src/pixie/images.nim
@@ -881,7 +881,10 @@ proc drawUber(
x += 16
var srcPos = p + dx * x.float32 + dy * y.float32
- srcPos = vec2(max(0, srcPos.x), max(0, srcPos.y))
+ srcPos = vec2(
+ clamp(srcPos.x, 0, b.width.float32),
+ clamp(srcPos.y, 0, b.height.float32)
+ )
for x in x ..< xMax:
let samplePos = ivec2((srcPos.x - h).int32, (srcPos.y - h).int32)
diff --git a/tests/test_images.nim b/tests/test_images.nim
index 92530fd..8d5ad7e 100644
--- a/tests/test_images.nim
+++ b/tests/test_images.nim
@@ -202,3 +202,16 @@ block:
let image = newImage(100, 100)
image.fill(rgba(255, 255, 255, 255))
doAssert not image.isTransparent()
+
+block:
+ let a = newImage(400, 400)
+ let b = newImage(156, 434)
+ b.fill(rgba(255, 0, 0, 255))
+ a.draw(
+ b,
+ mat3(
+ -0.5, -4.371138828673793e-008, 0.0,
+ -4.371138828673793e-008, 0.5, 0.0,
+ 292.0, 45.0, 1.0
+ )
+ )