From: David Gow <david@ingeniumdigital.com>
Date: Tue, 5 Aug 2014 14:19:26 +0000 (+0800)
Subject: Fix a huge bunch of memory corruption bugs in GL
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=10c3609cc8b3212e54f6e66c129cbd7e852fcc45

Fix a huge bunch of memory corruption bugs in GL

It now is equally broken across Intel and nVidia.

The brokenness can be very pretty, though.
---

diff --git a/src/document.cpp b/src/document.cpp
index c97aa56..8fc4c9a 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -397,6 +397,8 @@ void Document::AddPathFromString(const string & d, const Rect & bounds)
 			
 			x[2] = x[1];
 			y[2] = y[1];
+
+			Rect segment_bounds(x[0], y[0], x[2] - x[0], y[2] - y[0]);
 			
 			unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2]));
 			Add(BEZIER,bounds,index);
diff --git a/src/objectrenderer.cpp b/src/objectrenderer.cpp
index 9bbcfd6..76955a6 100644
--- a/src/objectrenderer.cpp
+++ b/src/objectrenderer.cpp
@@ -31,10 +31,14 @@ ObjectRenderer::ObjectRenderer(const ObjectType & type,
  */
 void ObjectRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
 {
+	// If we don't have anything to render, return.
+	if (first_obj_id == last_obj_id) return;
+	// If there are no objects of this type, return.
+	if (m_indexes.empty()) return;
 	unsigned first_index = 0;
-	while (m_indexes[first_index] < first_obj_id) first_index ++;
+	while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
 	unsigned last_index = first_index;
-	while (m_indexes[last_index] < last_obj_id) last_index ++;
+	while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
 
 	m_shader_program.Use();
 	m_ibo.Bind();
@@ -303,10 +307,15 @@ void BezierRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
 	if (!m_shader_program.Valid())
 		Warn("Shader is invalid (objects are of type %d)", m_type);
 
+	// If we don't have anything to render, return.
+	if (first_obj_id == last_obj_id) return;
+	// If there are no objects of this type, return.
+	if (m_indexes.empty()) return;
+
 	unsigned first_index = 0;
-	while (m_indexes[first_index] < first_obj_id) first_index ++;
+	while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
 	unsigned last_index = first_index;
-	while (m_indexes[last_index] < last_obj_id) last_index ++;
+	while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
 
 	m_shader_program.Use();
 	glUniform1i(m_shader_program.GetUniformLocation("bezier_buffer_texture"), 0);