new splash screen

why:

- the current splash-screen has no referring to official images on - https://en.bitcoin.it/wiki/Promotional_graphics
- the current splash screen only exists in a low res jpg
- current splash screen looks dark and "hackish"
- new splash screen should generate positive, "trust-emotions".
- new splash screen gives the user infos about the running client.
- new splash screen can handle long messages (in a lot of - languages the text is cropped in current release)

- new size (x2) 400x312

- contains textual information about the client
- textinfos are dynamicly written to the pixmap

when -testnet is switch on, the splashscreen will show the bitcoin logo in testnet-color (as well as a text [testnet])

example: https://dl.dropbox.com/u/7383846/new_bitcoin_splash.png

src/qt/splashscreen.cpp

@@ -0,0 +1,82 @@
+#include "splashscreen.h"
+#include "clientversion.h"
+#include "util.h"
+
+#include <QPainter>
+#include <QApplication>
+
+SplashScreen::SplashScreen(const QPixmap &pixmap, Qt::WindowFlags f) :
+    QSplashScreen(pixmap, f)
+{
+    // set reference point, paddings
+    int paddingRight            = 50;
+    int paddingTop              = 50;
+    int titleVersionVSpace      = 17;
+    int titleCopyrightVSpace    = 40;
+
+    float fontFactor            = 1.0;
+
+    // define text to place
+    QString titleText       = QString(QApplication::applicationName()).replace(QString("-testnet"), QString(""), Qt::CaseSensitive); // cut of testnet, place it as single object further down
+    QString versionText     = QString("Version %1").arg(QString::fromStdString(FormatFullVersion()));
+    QString copyrightText   = QChar(0xA9)+QString(" 2009-%1 ").arg(COPYRIGHT_YEAR) + QString(tr("The Bitcoin developers"));
+    QString testnetAddText  = QString(tr("[testnet]")); // define text to place as single text object
+
+    QString font            = "Arial";
+
+    // load the bitmap for writing some text over it
+    QPixmap newPixmap;
+    if(GetBoolArg("-testnet")) {
+        newPixmap     = QPixmap(":/images/splash_testnet");
+    }
+    else {
+        newPixmap     = QPixmap(":/images/splash");
+    }
+
+    QPainter pixPaint(&newPixmap);
+    pixPaint.setPen(QColor(100,100,100));
+
+    // check font size and drawing with
+    pixPaint.setFont(QFont(font, 33*fontFactor));
+    QFontMetrics fm = pixPaint.fontMetrics();
+    int titleTextWidth  = fm.width(titleText);
+    if(titleTextWidth > 160) {
+        // strange font rendering, Arial probably not found
+        fontFactor = 0.75;
+    }
+
+    pixPaint.setFont(QFont(font, 33*fontFactor));
+    fm = pixPaint.fontMetrics();
+    titleTextWidth  = fm.width(titleText);
+    pixPaint.drawText(newPixmap.width()-titleTextWidth-paddingRight,paddingTop,titleText);
+
+    pixPaint.setFont(QFont(font, 15*fontFactor));
+
+    // if the version string is to long, reduce size
+    fm = pixPaint.fontMetrics();
+    int versionTextWidth  = fm.width(versionText);
+    if(versionTextWidth > titleTextWidth+paddingRight-10) {
+        pixPaint.setFont(QFont(font, 10*fontFactor));
+        titleVersionVSpace -= 5;
+    }
+    pixPaint.drawText(newPixmap.width()-titleTextWidth-paddingRight+2,paddingTop+titleVersionVSpace,versionText);
+
+    // draw copyright stuff
+    pixPaint.setFont(QFont(font, 10*fontFactor));
+    pixPaint.drawText(newPixmap.width()-titleTextWidth-paddingRight,paddingTop+titleCopyrightVSpace,copyrightText);
+
+    // draw testnet string if -testnet is on
+    if(QApplication::applicationName().contains(QString("-testnet"))) {
+        // draw copyright stuff
+        QFont boldFont = QFont(font, 10*fontFactor);
+        boldFont.setWeight(QFont::Bold);
+        pixPaint.setFont(boldFont);
+        fm = pixPaint.fontMetrics();
+        int testnetAddTextWidth  = fm.width(testnetAddText);
+        pixPaint.drawText(newPixmap.width()-testnetAddTextWidth-10,15,testnetAddText);
+    }
+
+    pixPaint.end();
+
+    this->setPixmap(newPixmap);
+}