From 9e4ef5e3800ce2ef702e170bc43e50b19ed090ce Mon Sep 17 00:00:00 2001
From: Christian Muehlhaeuser <muesli@gmail.com>
Date: Tue, 12 Aug 2014 20:18:47 +0200
Subject: [PATCH] * Custom blur method included. May be replace by Qt's
 internal one eventually.

---
 src/libtomahawk/utils/TomahawkUtilsGui.cpp | 83 ++++++++++++++++++++++
 src/libtomahawk/utils/TomahawkUtilsGui.h   |  2 +
 2 files changed, 85 insertions(+)

diff --git a/src/libtomahawk/utils/TomahawkUtilsGui.cpp b/src/libtomahawk/utils/TomahawkUtilsGui.cpp
index c260fdbcb..21d1008c3 100644
--- a/src/libtomahawk/utils/TomahawkUtilsGui.cpp
+++ b/src/libtomahawk/utils/TomahawkUtilsGui.cpp
@@ -932,6 +932,89 @@ squareCenterPixmap( const QPixmap& sourceImage )
 }
 
 
+QImage
+blurred( const QImage& image, const QRect& rect, int radius, bool alphaOnly, bool blackWhite )
+{
+    int tab[] = { 14, 10, 8, 6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 };
+    int alpha = (radius < 1)  ? 16 : (radius > 17) ? 1 : tab[radius-1];
+
+    QImage result = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
+    if ( blackWhite )
+    {
+        for ( int i = 0; i < result.width(); ++i )
+        {
+            for (int j = 0; j < result.height(); ++j)
+            {
+                const QRgb col = result.pixel(i, j);
+                const int gray = qGray(col);
+                result.setPixel(i, j, qRgb(gray*0.3, gray*0.3, gray*0.3));
+            }
+        }
+    }
+
+    int r1 = rect.top();
+    int r2 = rect.bottom();
+    int c1 = rect.left();
+    int c2 = rect.right();
+
+    int bpl = result.bytesPerLine();
+    int rgba[4];
+    unsigned char* p;
+
+    int i1 = 0;
+    int i2 = 3;
+
+    if (alphaOnly)
+        i1 = i2 = (QSysInfo::ByteOrder == QSysInfo::BigEndian ? 0 : 3);
+
+    for (int col = c1; col <= c2; col++) {
+        p = result.scanLine(r1) + col * 4;
+        for (int i = i1; i <= i2; i++)
+            rgba[i] = p[i] << 4;
+
+        p += bpl;
+        for (int j = r1; j < r2; j++, p += bpl)
+            for (int i = i1; i <= i2; i++)
+                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    }
+
+    for (int row = r1; row <= r2; row++) {
+        p = result.scanLine(row) + c1 * 4;
+        for (int i = i1; i <= i2; i++)
+            rgba[i] = p[i] << 4;
+
+        p += 4;
+        for (int j = c1; j < c2; j++, p += 4)
+            for (int i = i1; i <= i2; i++)
+                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    }
+
+    for (int col = c1; col <= c2; col++) {
+        p = result.scanLine(r2) + col * 4;
+        for (int i = i1; i <= i2; i++)
+            rgba[i] = p[i] << 4;
+
+        p -= bpl;
+        for (int j = r1; j < r2; j++, p -= bpl)
+            for (int i = i1; i <= i2; i++)
+                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    }
+
+    for (int row = r1; row <= r2; row++) {
+        p = result.scanLine(row) + c2 * 4;
+        for (int i = i1; i <= i2; i++)
+            rgba[i] = p[i] << 4;
+
+        p -= 4;
+        for (int j = c1; j < c2; j++, p -= 4)
+            for (int i = i1; i <= i2; i++)
+                p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
+    }
+
+    return result;
+}
+
+
 void
 drawCompositedPopup( QWidget* widget,
                      const QPainterPath& outline,
diff --git a/src/libtomahawk/utils/TomahawkUtilsGui.h b/src/libtomahawk/utils/TomahawkUtilsGui.h
index 109edc67d..cdc4ef8e9 100644
--- a/src/libtomahawk/utils/TomahawkUtilsGui.h
+++ b/src/libtomahawk/utils/TomahawkUtilsGui.h
@@ -73,6 +73,8 @@ namespace TomahawkUtils
     DLLEXPORT QPixmap addDropShadow( const QPixmap& sourceImage, const QSize& targetSize );
     DLLEXPORT QPixmap squareCenterPixmap( const QPixmap& sourceImage );
 
+    DLLEXPORT QImage blurred( const QImage& image, const QRect& rect, int radius, bool alphaOnly = false, bool blackWhite = false );
+
     DLLEXPORT void drawCompositedPopup( QWidget* widget, const QPainterPath& outline, const QColor& lineColor, const QBrush& backgroundBrush, qreal opacity );
 }