[freetype2-demos] master 2aa1763 16/41: [ftinspect] Support LCD rendering.

[Werner Lemberg]

branch: master
commit 2aa1763cbc04076bf3aa83059caabcc607e6c9c8
Author: Charlie Jiang <w@chariri.moe>
Commit: Werner Lemberg <wl@gnu.org>

    [ftinspect] Support LCD rendering.
    
    * src/ftinspect/engine/rendering.cpp, src/ftinspect/engine/rendering.hpp:
      Implement `convertLCDToARGB` and `convertLCDVToARGB`.
      Add `lcdUsesBGR` property.
    
    * src/ftinspect/panels/settingpanel.cpp: Uncomment functional code.
---
 src/ftinspect/engine/rendering.cpp    | 88 ++++++++++++++++++++++++++++++++++-
 src/ftinspect/engine/rendering.hpp    |  3 ++
 src/ftinspect/panels/settingpanel.cpp |  4 +-
 3 files changed, 91 insertions(+), 4 deletions(-)

diff --git a/src/ftinspect/engine/rendering.cpp 
b/src/ftinspect/engine/rendering.cpp
index 76f5eae..4fbb251 100644
--- a/src/ftinspect/engine/rendering.cpp
+++ b/src/ftinspect/engine/rendering.cpp
@@ -142,6 +142,20 @@ RenderingEngine::convertBitmapTo8Bpp(FT_Bitmap* bitmap)
 }
 
 
+void
+convertLCDToARGB(FT_Bitmap& bitmap,
+                 QImage& image,
+                 bool isBGR,
+                 QVector<QRgb>& colorTable);
+
+
+void
+convertLCDVToARGB(FT_Bitmap& bitmap,
+                  QImage& image,
+                  bool isBGR,
+                  QVector<QRgb>& colorTable);
+
+
 QImage*
 RenderingEngine::convertBitmapToQImage(FT_Bitmap* src)
 {
@@ -216,11 +230,11 @@ RenderingEngine::convertBitmapToQImage(FT_Bitmap* src)
     break;
   case FT_PIXEL_MODE_LCD:;
     result = new QImage(width, height, format);
-    //convertLCDToARGB(bmap, *result, engine_->lcdUsesBGR(), foregroundTable_);
+    convertLCDToARGB(bmap, *result, lcdUsesBGR_, foregroundTable_);
     break;
   case FT_PIXEL_MODE_LCD_V:;
     result = new QImage(width, height, format);
-    //convertLCDVToARGB(bmap, *result, engine_->lcdUsesBGR(), 
foregroundTable_);
+    convertLCDVToARGB(bmap, *result, lcdUsesBGR_, foregroundTable_);
     break;
   }
 
@@ -432,4 +446,74 @@ RenderingEngine::tryDirectRenderColorLayers(int glyphIndex,
 }
 
 
+void
+convertLCDToARGB(FT_Bitmap& bitmap,
+                 QImage& image,
+                 bool isBGR,
+                 QVector<QRgb>& colorTable)
+{
+  int height = bitmap.rows;
+  int width = bitmap.width / 3;
+  int width3 = bitmap.width;
+
+  unsigned char* srcPtr = bitmap.buffer;
+  unsigned* dstPtr = reinterpret_cast<unsigned*>(image.bits());
+
+  int offR = !isBGR ? 0 : 2;
+  int offG = 1;
+  int offB = isBGR ? 0 : 2;
+  for (int i = 0; i < height; i++)
+  {
+    for (int j = 0; j < width3; j += 3)
+    {
+      unsigned char ar = srcPtr[j + offR];
+      unsigned char ag = srcPtr[j + offG];
+      unsigned char ab = srcPtr[j + offB];
+      unsigned dr = colorTable[ar] & 0xFF;
+      unsigned dg = colorTable[ag] & 0xFF;
+      unsigned db = colorTable[ab] & 0xFF;
+      *dstPtr = (0xFFu << 24) | (dr << 16) | (dg << 8) | db;
+      dstPtr++;
+    }
+    srcPtr += bitmap.pitch;
+    dstPtr += image.bytesPerLine() / 4 - width; // skip blank area
+  }
+}
+
+
+void
+convertLCDVToARGB(FT_Bitmap& bitmap,
+                  QImage& image,
+                  bool isBGR,
+                  QVector<QRgb>& colorTable)
+{
+  int height = bitmap.rows / 3;
+  int width = bitmap.width;
+  int srcPitch = bitmap.pitch;
+
+  unsigned char* srcPtr = bitmap.buffer;
+  unsigned* dstPtr = reinterpret_cast<unsigned*>(image.bits());
+
+  int offR = !isBGR ? 0 : 2 * srcPitch;
+  int offG = srcPitch;
+  int offB = isBGR ? 0 : 2 * srcPitch;
+  for (int i = 0; i < height; i++)
+  {
+    for (int j = 0; j < width; j++)
+    {
+      unsigned char ar = srcPtr[j + offR];
+      unsigned char ag = srcPtr[j + offG];
+      unsigned char ab = srcPtr[j + offB];
+      unsigned dr = colorTable[ar] & 0xFF;
+      unsigned dg = colorTable[ag] & 0xFF;
+      unsigned db = colorTable[ab] & 0xFF;
+      *dstPtr = (0xFFu << 24) | (dr << 16) | (dg << 8) | db;
+      dstPtr++;
+    }
+    srcPtr += 3ull * srcPitch;                  // move 3 lines
+    dstPtr += image.bytesPerLine() / 4 - width; // skip blank area
+  }
+}
+
+
 // end of rendering.cpp
diff --git a/src/ftinspect/engine/rendering.hpp 
b/src/ftinspect/engine/rendering.hpp
index 6dcedf0..c7e44b2 100644
--- a/src/ftinspect/engine/rendering.hpp
+++ b/src/ftinspect/engine/rendering.hpp
@@ -19,6 +19,7 @@ public:
   void setBackground(QRgb background);
   void setGamma(double gamma);
   void calculateForegroundTable();
+  void setLCDUsesBGR(bool isBGR) { lcdUsesBGR_ = isBGR; }
 
   QRgb foreground() { return foregroundColor_; }
   QRgb background() { return backgroundColor_; }
@@ -54,6 +55,8 @@ private:
   QRgb foregroundColor_;
   double gamma_;
   QVector<QRgb> foregroundTable_;
+
+  bool lcdUsesBGR_;
 };
 
 
diff --git a/src/ftinspect/panels/settingpanel.cpp 
b/src/ftinspect/panels/settingpanel.cpp
index f07691c..359410e 100644
--- a/src/ftinspect/panels/settingpanel.cpp
+++ b/src/ftinspect/panels/settingpanel.cpp
@@ -382,8 +382,8 @@ SettingPanel::applySettings()
   engine_->setPaletteIndex(paletteComboBox_->currentIndex());
 
   engine_->setUseColorLayer(colorLayerCheckBox_->isChecked());
-  //engine_->setLCDUsesBGR(aaSettings.isBGR);
-  //engine_->setLCDSubPixelPositioning(
+  engine_->renderingEngine()->setLCDUsesBGR(aaSettings.isBGR);
+  //engine_->renderingEngine()->setLCDSubPixelPositioning(
   //  antiAliasingComboBox_->currentIndex()
   //    == AntiAliasingComboBoxModel::AntiAliasing_Light_SubPixel);