PDF doesn't require the alpha paintengine

Remove the inheritance from the alpha paint engine
for the PDF generator. The alpha engine was only
required to support transparency on Postscript.

Change-Id: If09a00a3123f73e4c36f708651a3abae014187a3
Reviewed-on: http://codereview.qt.nokia.com/3204
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

src/gui/painting/qpdf.cpp

@@ -928,12 +928,12 @@ void QPdfPage::streamImage(int w, int h, int object)
 
 
 QPdfEngine::QPdfEngine(QPdfEnginePrivate &dd)
-    : QAlphaPaintEngine(dd, qt_pdf_decide_features())
+    : QPaintEngine(dd, qt_pdf_decide_features())
 {
 }
 
 QPdfEngine::QPdfEngine()
-    : QAlphaPaintEngine(*new QPdfEnginePrivate(), qt_pdf_decide_features())
+    : QPaintEngine(*new QPdfEnginePrivate(), qt_pdf_decide_features())
 {
 }
 
@@ -985,11 +985,6 @@ void QPdfEngine::drawRects (const QRectF *rects, int rectCount)
         return;
 
     Q_D(QPdfEngine);
-    if (d->useAlphaEngine) {
-        QAlphaPaintEngine::drawRects(rects, rectCount);
-        if (!continueCall())
-            return;
-    }
 
     if (d->clipEnabled && d->allClipped)
         return;
@@ -1018,12 +1013,6 @@ void QPdfEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawM
 {
     Q_D(QPdfEngine);
 
-    if (d->useAlphaEngine) {
-        QAlphaPaintEngine::drawPolygon(points, pointCount, mode);
-        if (!continueCall())
-            return;
-    }
-
     if (!points || !pointCount)
         return;
 
@@ -1060,12 +1049,6 @@ void QPdfEngine::drawPath (const QPainterPath &p)
 {
     Q_D(QPdfEngine);
 
-    if (d->useAlphaEngine) {
-        QAlphaPaintEngine::drawPath(p);
-        if (!continueCall())
-            return;
-    }
-
     if (d->clipEnabled && d->allClipped)
         return;
     if (!d->hasPen && !d->hasBrush)
@@ -1176,12 +1159,6 @@ void QPdfEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
 {
     Q_D(QPdfEngine);
 
-    if (d->useAlphaEngine) {
-        QAlphaPaintEngine::drawTextItem(p, textItem);
-        if (!continueCall())
-            return;
-    }
-
     if (!d->hasPen || (d->clipEnabled && d->allClipped))
         return;
 
@@ -1213,12 +1190,6 @@ void QPdfEngine::updateState(const QPaintEngineState &state)
 {
     Q_D(QPdfEngine);
 
-    if (d->useAlphaEngine) {
-        QAlphaPaintEngine::updateState(state);
-        if (!continueCall())
-            return;
-    }
-
     QPaintEngine::DirtyFlags flags = state.state();
 
     if (flags & DirtyTransform)
@@ -1335,31 +1306,6 @@ void QPdfEngine::updateClipPath(const QPainterPath &p, Qt::ClipOperation op)
         d->clips.clear();
         d->clips.append(path);
     }
-
-    if (d->useAlphaEngine) {
-        // if we have an alpha region, we have to subtract that from the
-        // any existing clip region since that region will be filled in
-        // later with images
-        QPainterPath alphaClip = qt_regionToPath(alphaClipping());
-        if (!alphaClip.isEmpty()) {
-            if (!d->clipEnabled) {
-                QRect r = d->fullPage ? d->paperRect() : d->pageRect();
-                QPainterPath dev;
-                dev.addRect(QRect(0, 0, r.width(), r.height()));
-                if (path.isEmpty())
-                    path = dev;
-                else
-                    path = path.intersected(dev);
-                d->clipEnabled = true;
-            } else {
-                path = painter()->clipPath();
-                path = d->stroker.matrix.map(path);
-            }
-            path = path.subtracted(alphaClip);
-            d->clips.clear();
-            d->clips.append(path);
-        }
-    }
 }
 
 void QPdfEngine::setPen()
@@ -1517,7 +1463,6 @@ int QPdfEngine::metric(QPaintDevice::PaintDeviceMetric metricType) const
 
 QPdfEnginePrivate::QPdfEnginePrivate()
     : clipEnabled(false), allClipped(false), hasPen(true), hasBrush(false), simplePen(false),
-      useAlphaEngine(false),
       outDevice(0), fd(-1),
       fullPage(false), embedFonts(true),
       landscape(false),

src/gui/painting/qpdf_p.h

@@ -56,7 +56,7 @@
 #include "QtCore/qstring.h"
 #include "QtCore/qvector.h"
 #include "private/qstroker_p.h"
-#include "private/qpaintengine_alpha_p.h"
+#include "private/qpaintengine_p.h"
 #include "private/qfontengine_p.h"
 #include "private/qfontsubset_p.h"
 
@@ -164,7 +164,7 @@ private:
 
 class QPdfEnginePrivate;
 
-class QPdfEngine : public QAlphaPaintEngine
+class QPdfEngine : public QPaintEngine
 {
     Q_DECLARE_PRIVATE(QPdfEngine)
 public:
@@ -209,7 +209,7 @@ private:
     void updateClipPath(const QPainterPath & path, Qt::ClipOperation op);
 };
 
-class QPdfEnginePrivate : public QAlphaPaintEnginePrivate
+class QPdfEnginePrivate : public QPaintEnginePrivate
 {
     Q_DECLARE_PUBLIC(QPdfEngine)
 public:
@@ -259,7 +259,6 @@ public:
     bool hasBrush;
     bool simplePen;
     qreal opacity;
-    bool useAlphaEngine;
 
     QHash<QFontEngine::FaceId, QFontSubset *> fonts;