From 9c09e0e86bc5056c2bc34b711024bac8e09dbf74 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@digia.com>
Date: Thu, 7 Aug 2014 15:43:23 +0200
Subject: Basic support for text rendering

Change-Id: I365c44b596f8866df2aff4e9f5e088bec0010539
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
---
 softwarecontext/context.cpp         |  7 ++++++
 softwarecontext/context.h           |  1 +
 softwarecontext/glyphnode.cpp       | 47 +++++++++++++++++++++++++++++++++++++
 softwarecontext/glyphnode.h         | 28 ++++++++++++++++++++++
 softwarecontext/softwarecontext.pro |  6 +++--
 5 files changed, 87 insertions(+), 2 deletions(-)
 create mode 100644 softwarecontext/glyphnode.cpp
 create mode 100644 softwarecontext/glyphnode.h

diff --git a/softwarecontext/context.cpp b/softwarecontext/context.cpp
index 7de0aa5cde..c0c4720c81 100644
--- a/softwarecontext/context.cpp
+++ b/softwarecontext/context.cpp
@@ -44,6 +44,7 @@
 #include "rectanglenode.h"
 #include "imagenode.h"
 #include "pixmaptexture.h"
+#include "glyphnode.h"
 
 #include <QtCore/QCoreApplication>
 #include <QtCore/QElapsedTimer>
@@ -137,6 +138,7 @@ RenderContext::RenderContext(QSGContext *ctx)
 Context::Context(QObject *parent)
     : QSGContext(parent)
 {
+    setDistanceFieldEnabled(false);
 }
 
 QSGRectangleNode *Context::createRectangleNode()
@@ -149,6 +151,11 @@ QSGImageNode *Context::createImageNode()
     return new ImageNode();
 }
 
+QSGGlyphNode *Context::createGlyphNode(QSGRenderContext */*rc*/, bool /*preferNativeGlyphNode*/)
+{
+    return new GlyphNode();
+}
+
 void RenderContext::initialize(QOpenGLContext *context)
 {
     QSGRenderContext::initialize(context);
diff --git a/softwarecontext/context.h b/softwarecontext/context.h
index 75cf02d767..0eb51ba9cd 100644
--- a/softwarecontext/context.h
+++ b/softwarecontext/context.h
@@ -91,6 +91,7 @@ public:
 
     virtual QSGRectangleNode *createRectangleNode();
     virtual QSGImageNode *createImageNode();
+    virtual QSGGlyphNode *createGlyphNode(QSGRenderContext *rc, bool preferNativeGlyphNode);
 
 private:
 };
diff --git a/softwarecontext/glyphnode.cpp b/softwarecontext/glyphnode.cpp
new file mode 100644
index 0000000000..1102980eb2
--- /dev/null
+++ b/softwarecontext/glyphnode.cpp
@@ -0,0 +1,47 @@
+#include "glyphnode.h"
+
+GlyphNode::GlyphNode()
+    : m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 0)
+{
+    setMaterial((QSGMaterial*)1);
+    setGeometry(&m_geometry);
+}
+
+
+void GlyphNode::setGlyphs(const QPointF &position, const QGlyphRun &glyphs)
+{
+    m_position = position;
+    m_glyphRun = glyphs;
+}
+
+void GlyphNode::setColor(const QColor &color)
+{
+    m_color = color;
+}
+
+void GlyphNode::setStyle(QQuickText::TextStyle style)
+{
+}
+
+void GlyphNode::setStyleColor(const QColor &color)
+{
+}
+
+QPointF GlyphNode::baseLine() const
+{
+    return QPointF();
+}
+
+void GlyphNode::setPreferredAntialiasingMode(QSGGlyphNode::AntialiasingMode)
+{
+}
+
+void GlyphNode::update()
+{
+}
+
+void GlyphNode::paint(QPainter *painter)
+{
+    painter->setPen(m_color);
+    painter->drawGlyphRun(m_position - QPointF(0, m_glyphRun.rawFont().ascent()), m_glyphRun);
+}
diff --git a/softwarecontext/glyphnode.h b/softwarecontext/glyphnode.h
new file mode 100644
index 0000000000..1724ef8394
--- /dev/null
+++ b/softwarecontext/glyphnode.h
@@ -0,0 +1,28 @@
+#ifndef GLYPHNODE_H
+#define GLYPHNODE_H
+
+#include <private/qsgadaptationlayer_p.h>
+
+class GlyphNode : public QSGGlyphNode
+{
+public:
+    GlyphNode();
+
+    virtual void setGlyphs(const QPointF &position, const QGlyphRun &glyphs);
+    virtual void setColor(const QColor &color);
+    virtual void setStyle(QQuickText::TextStyle style);
+    virtual void setStyleColor(const QColor &color);
+    virtual QPointF baseLine() const;
+    virtual void setPreferredAntialiasingMode(AntialiasingMode);
+    virtual void update();
+
+    virtual void paint(QPainter *painter);
+
+private:
+    QPointF m_position;
+    QGlyphRun m_glyphRun;
+    QColor m_color;
+    QSGGeometry m_geometry;
+};
+
+#endif // GLYPHNODE_H
diff --git a/softwarecontext/softwarecontext.pro b/softwarecontext/softwarecontext.pro
index 0c6486fc8b..31bb122eaf 100644
--- a/softwarecontext/softwarecontext.pro
+++ b/softwarecontext/softwarecontext.pro
@@ -11,7 +11,8 @@ SOURCES += \
     renderloop.cpp \
     rectanglenode.cpp \
     imagenode.cpp \
-    pixmaptexture.cpp
+    pixmaptexture.cpp \
+    glyphnode.cpp
 
 HEADERS += \
     context.h \
@@ -19,7 +20,8 @@ HEADERS += \
     renderloop.h \
     rectanglenode.h \
     imagenode.h \
-    pixmaptexture.h
+    pixmaptexture.h \
+    glyphnode.h
 
 OTHER_FILES += softwarecontext.json
 
-- 
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