From fa128f5252761ca944c7b670887a4553d2afdf61 Mon Sep 17 00:00:00 2001
From: Kim Motoyoshi Kalland <kim.kalland@nokia.com>
Date: Thu, 19 May 2011 16:06:44 +0200
Subject: Avoid using indices in the RectangleNode implementation.

Task-number: QTBUG-18731
---
 .../scenegraph/qsgdefaultrectanglenode.cpp         | 50 +++++++++-------------
 1 file changed, 21 insertions(+), 29 deletions(-)

(limited to 'src')

diff --git a/src/declarative/scenegraph/qsgdefaultrectanglenode.cpp b/src/declarative/scenegraph/qsgdefaultrectanglenode.cpp
index 21632040d9..34a6db4f78 100644
--- a/src/declarative/scenegraph/qsgdefaultrectanglenode.cpp
+++ b/src/declarative/scenegraph/qsgdefaultrectanglenode.cpp
@@ -455,17 +455,16 @@ void QSGDefaultRectangleNode::updateGeometry()
             --lastGradientStop;
 
         int borderVertexCount = 0;
-        ushort *borderIndices = 0;
         if (penWidth) {
-            borderGeometry->allocate((1 + lastGradientStop - nextGradientStop) * 2 + 8,
-                                     (1 + lastGradientStop - nextGradientStop) * 4 + 10);
+            borderGeometry->allocate((1 + lastGradientStop - nextGradientStop) * 4 + 10);
             borderVertices = (Vertex *)borderGeometry->vertexData();
-            Q_ASSERT(borderGeometry->indexType() == GL_UNSIGNED_SHORT);
-            borderIndices = borderGeometry->indexDataAsUShort();
         }
         fill->allocate((3 + lastGradientStop - nextGradientStop) * 2);
         fillVertices = (uchar *)fill->vertexData();
 
+        QVarLengthArray<qreal, 16> ys(3 + lastGradientStop - nextGradientStop);
+        int yCount = 0;
+
         for (int part = 0; part < 2; ++part) {
             qreal y = (part ? innerRect.bottom() : innerRect.top());
             gradientPos = (y - innerRect.top() + halfPenWidth) / m_rect.height();
@@ -485,10 +484,7 @@ void QSGDefaultRectangleNode::updateGeometry()
                 vertices[fillVertexCount].color = fillColor;
                 ++fillVertexCount;
 
-                if (penWidth) {
-                    borderVertices[borderVertexCount++].position = QVector2D(innerRect.right(), gy);
-                    borderVertices[borderVertexCount++].position = QVector2D(innerRect.left(), gy);
-                }
+                ys[yCount++] = gy;
 
                 ++nextGradientStop;
             }
@@ -519,32 +515,28 @@ void QSGDefaultRectangleNode::updateGeometry()
                 ++fillVertexCount;
             }
 
-            if (penWidth) {
-                borderVertices[borderVertexCount++].position = QVector2D(innerRect.right(), y);
-                borderVertices[borderVertexCount++].position = QVector2D(innerRect.left(), y);
-            }
+            ys[yCount++] = y;
         }
 
         if (penWidth) {
-            // Add four corners.
             borderVertices[borderVertexCount++].position = QVector2D(outerRect.right(), outerRect.top());
-            borderVertices[borderVertexCount++].position = QVector2D(outerRect.left(), outerRect.top());
-            borderVertices[borderVertexCount++].position = QVector2D(outerRect.right(), outerRect.bottom());
-            borderVertices[borderVertexCount++].position = QVector2D(outerRect.left(), outerRect.bottom());
-
-            int borderIndexCount = 0;
-            for (int i = 0; i < fillVertexCount / 2; ++i) {
-                borderIndices[borderIndexCount++] = borderVertexCount - (i == 0 ? 4 : 2); // Upper or lower right corner.
-                borderIndices[borderIndexCount++] = 2 * i + 0;
+            borderVertices[borderVertexCount++].position = QVector2D(innerRect.right(), ys[0]);
+            for (int i = 1; i < fillVertexCount / 2; ++i) {
+                borderVertices[borderVertexCount++].position = QVector2D(outerRect.right(), outerRect.bottom());
+                borderVertices[borderVertexCount++].position = QVector2D(innerRect.right(), ys[i]);
             }
-            for (int i = 0; i < fillVertexCount / 2; ++i) {
-                borderIndices[borderIndexCount++] = borderVertexCount - (i == 0 ? 1 : 3); // Lower or upper left corner.
-                borderIndices[borderIndexCount++] = fillVertexCount - 2 * i - 1;
+
+            borderVertices[borderVertexCount++].position = QVector2D(outerRect.left(), outerRect.bottom());
+            borderVertices[borderVertexCount++].position = QVector2D(innerRect.left(), ys[fillVertexCount / 2 - 1]);
+            for (int i = fillVertexCount / 2 - 2; i >= 0; --i) {
+                borderVertices[borderVertexCount++].position = QVector2D(outerRect.left(), outerRect.top());
+                borderVertices[borderVertexCount++].position = QVector2D(innerRect.left(), ys[i]);
             }
-            borderIndices[borderIndexCount++] = fillVertexCount; // Upper right corner.
-            borderIndices[borderIndexCount++] = 0;
-            Q_ASSERT(fillVertexCount + 4 == borderVertexCount);
-            Q_ASSERT(borderIndexCount == borderGeometry->indexCount());
+
+            borderVertices[borderVertexCount++].position = QVector2D(outerRect.right(), outerRect.top());
+            borderVertices[borderVertexCount++].position = QVector2D(innerRect.right(), innerRect.top());
+
+            Q_ASSERT(borderVertexCount == borderGeometry->vertexCount());
         }
         Q_ASSERT(fillVertexCount == fill->vertexCount());
     }
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