From 4247faa97c4daad1ebef16bbb52bc49eb194b667 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Tue, 14 May 2024 15:06:06 -0500
Subject: [PATCH] fix possible crash when texture size is 0

---
 src/gui/intro.cpp            | 2 ++
 src/gui/render/renderDX9.cpp | 4 ++++
 src/gui/render/renderGL1.cpp | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/src/gui/intro.cpp b/src/gui/intro.cpp
index cbb4ff042..f191d4b34 100644
--- a/src/gui/intro.cpp
+++ b/src/gui/intro.cpp
@@ -27,6 +27,8 @@ void FurnaceGUI::drawImage(ImDrawList* dl, FurnaceGUIImages image, const ImVec2&
   FurnaceGUIImage* imgI=getImage(image);
   FurnaceGUITexture* img=getTexture(image);
 
+  if (img==NULL) return;
+
   float squareSize=MAX(introMax.x-introMin.x,introMax.y-introMin.y);
   float uDiff=uvMax.x-uvMin.x;
   float vDiff=uvMax.y-uvMin.y;
diff --git a/src/gui/render/renderDX9.cpp b/src/gui/render/renderDX9.cpp
index 66efdf0e6..a2bba061c 100644
--- a/src/gui/render/renderDX9.cpp
+++ b/src/gui/render/renderDX9.cpp
@@ -50,11 +50,15 @@ ImTextureID FurnaceGUIRenderDX9::getTextureID(FurnaceGUITexture* which) {
 
 float FurnaceGUIRenderDX9::getTextureU(FurnaceGUITexture* which) {
   FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  if (which==NULL) return 0.0;
+  if (t->widthReal<1) return 0.0f;
   return (float)t->width/(float)t->widthReal;
 }
 
 float FurnaceGUIRenderDX9::getTextureV(FurnaceGUITexture* which) {
   FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  if (which==NULL) return 0.0;
+  if (t->heightReal<1) return 0.0f;
   return (float)t->height/(float)t->heightReal;
 }
 
diff --git a/src/gui/render/renderGL1.cpp b/src/gui/render/renderGL1.cpp
index 9fb4485b5..66aa35cdc 100644
--- a/src/gui/render/renderGL1.cpp
+++ b/src/gui/render/renderGL1.cpp
@@ -46,11 +46,13 @@ ImTextureID FurnaceGUIRenderGL1::getTextureID(FurnaceGUITexture* which) {
 
 float FurnaceGUIRenderGL1::getTextureU(FurnaceGUITexture* which) {
   FurnaceGL1Texture* t=(FurnaceGL1Texture*)which;
+  if (t->widthReal<1) return 0.0f;
   return (float)t->width/(float)t->widthReal;
 }
 
 float FurnaceGUIRenderGL1::getTextureV(FurnaceGUITexture* which) {
   FurnaceGL1Texture* t=(FurnaceGL1Texture*)which;
+  if (t->heightReal<1) return 0.0f;
   return (float)t->height/(float)t->heightReal;
 }