Try to take AA into account when filling

2 files changed, 75 insertions, 1 deletions

diff --git a/noncore/graphics/drawpad/filltool.cpp b/noncore/graphics/drawpad/filltool.cpp
index d323cc2..0177e1c 100644
--- a/noncore/graphics/drawpad/filltool.cpp
+++ b/noncore/graphics/drawpad/filltool.cpp
@@ -16,12 +16,14 @@
 #include "drawpad.h"
 #include "drawpadcanvas.h"
 #include "page.h"
 
 #include <qimage.h>
 
+const int FILL_THRESHOLD = 65536;
+
 FillTool::FillTool(DrawPad* drawPad, DrawPadCanvas* drawPadCanvas)
     : Tool(drawPad, drawPadCanvas)
 {
 }
 
 FillTool::~FillTool()
@@ -35,13 +37,29 @@ void FillTool::mousePressEvent(QMouseEvent* e)
 
     m_image = m_pDrawPadCanvas->currentPage()->convertToImage();
     m_fillRgb = m_pDrawPad->brush().color().rgb();
     m_oldRgb = m_image.pixel(x, y);
 
     if (m_oldRgb != m_fillRgb) {
-        fillLine(x, y);
+        if (m_pDrawPad->antiAliasing()) {
+            m_mask.create(m_image.width(), m_image.height(), 8, 2);
+            m_mask.fill(0);
+
+            fillMaskLine(x, y);
+
+            for (int i = 0; i < m_image.width(); i++) {
+                for (int j = 0; j < m_image.height(); j++) {
+                    if (m_mask.pixelIndex(i, j) == 1) {
+                        setInterpolatedPixel(i, j);
+                    }
+                }
+            }
+
+        } else {
+            fillLine(x, y);
+        }
 
         m_pDrawPadCanvas->currentPage()->convertFromImage(m_image);
         m_pDrawPadCanvas->viewport()->update();
 
         m_pDrawPadCanvas->backupPage();
     }
@@ -85,6 +103,58 @@ void FillTool::fillLine(int x, int y)
             for (int i = x1 + 1; i < x2; i++) {
                 fillLine(i, y + 1);
             }
         }
     }
 }
+
+void FillTool::fillMaskLine(int x, int y)
+{
+    if ((x >= 0) && (x < m_image.width()) && (y >= 0) && (y < m_image.height())) {
+        if (m_mask.pixelIndex(x, y) == 0) {
+                if (rgbDistance(m_image.pixel(x, y), m_oldRgb) < FILL_THRESHOLD) {
+                int x1, x2;
+
+                x1 = x - 1;
+                x2 = x + 1;
+
+                while ((x1 >= 0) && (rgbDistance(m_image.pixel(x1, y), m_oldRgb) < FILL_THRESHOLD)) {
+                    x1--;
+                }
+
+                while ((x2 < m_image.width()) && (rgbDistance(m_image.pixel(x2, y), m_oldRgb) < FILL_THRESHOLD)) {
+                    x2++;
+                }
+
+                for (int i = x1 + 1; i < x2; i++) {
+                    m_mask.setPixel(i, y, 1);
+                }
+
+                for (int i = x1 + 1; i < x2; i++) {
+                    fillMaskLine(i, y - 1);
+                }
+
+                for (int i = x1 + 1; i < x2; i++) {
+                    fillMaskLine(i, y + 1);
+                }
+            }
+        }
+    }
+}
+
+void FillTool::setInterpolatedPixel(int x, int y)
+{
+    int fillRed = QMIN(QMAX(qRed(m_fillRgb) + qRed(m_image.pixel(x, y)) - qRed(m_oldRgb), 0), 255);
+    int fillGreen = QMIN(QMAX(qGreen(m_fillRgb) + qGreen(m_image.pixel(x, y)) - qGreen(m_oldRgb), 0), 255);
+    int fillBlue = QMIN(QMAX(qBlue(m_fillRgb) + qBlue(m_image.pixel(x, y)) - qBlue(m_oldRgb), 0), 255);
+
+    m_image.setPixel(x, y, qRgb(fillRed, fillGreen, fillBlue));
+}
+
+int FillTool::rgbDistance(QRgb rgb1, QRgb rgb2)
+{
+    int redDistance = qRed(rgb2) - qRed(rgb1);
+    int greenDistance = qGreen(rgb2) - qGreen(rgb1);
+    int blueDistance = qBlue(rgb2) - qBlue(rgb1);
+
+    return (redDistance * redDistance + greenDistance * greenDistance + blueDistance * blueDistance);
+}
diff --git a/noncore/graphics/drawpad/filltool.h b/noncore/graphics/drawpad/filltool.h
index eaf9a27..03ee489 100644
--- a/noncore/graphics/drawpad/filltool.h
+++ b/noncore/graphics/drawpad/filltool.h
@@ -27,13 +27,17 @@ public:
     void mousePressEvent(QMouseEvent* e);
     void mouseReleaseEvent(QMouseEvent* e);
     void mouseMoveEvent(QMouseEvent* e);
 
 private:
     void fillLine(int x, int y);
+    void fillMaskLine(int x, int y);
+    void setInterpolatedPixel(int x, int y);
+    int rgbDistance(QRgb rgb1, QRgb rgb2);
 
     QImage m_image;
+    QImage m_mask;
     QRgb m_fillRgb;
     QRgb m_oldRgb;
 };
 
 #endif // FILLTOOL_H