[freetype2-demos] master faffad8 2/2: [ftinspect] Start with FreeType initialization.

[Werner LEMBERG]

branch: master
commit faffad8262b3d901c1c5c780319b48087acb6aa2
Author: Werner Lemberg <address@hidden>
Commit: Werner Lemberg <address@hidden>

    [ftinspect] Start with FreeType initialization.
    
    * src/ftinspect.h: Include some FreeType headers.
    (Font): New structure for holding a (physical) font.
    (Engine): New class for communication with FreeType library.
    (MainGUI): Make `engine' a friend.
    
    * src/ftinspect.cpp (faceRequester): New function for FreeType's
    cache manager.
    (Engine::Engine, Engine::update): Some basic functions; to be
    extensively revised in later commits.
    (main): Updated.
    
    * src/ftinspect.pro: Add support for FreeType and dependent
    libraries.  Right now, you have to adjust paths manually.
---
 ChangeLog         |   18 +++++++++++
 src/ftinspect.cpp |   90 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/ftinspect.h   |   51 ++++++++++++++++++++++++++++++
 src/ftinspect.pro |   17 ++++++++++
 4 files changed, 176 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index fe3a784..9cc48e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,23 @@
 2016-05-02  Werner Lemberg  <address@hidden>
 
+       [ftinspect] Start with FreeType initialization.
+
+       * src/ftinspect.h: Include some FreeType headers.
+       (Font): New structure for holding a (physical) font.
+       (Engine): New class for communication with FreeType library.
+       (MainGUI): Make `engine' a friend.
+
+       * src/ftinspect.cpp (faceRequester): New function for FreeType's
+       cache manager.
+       (Engine::Engine, Engine::update): Some basic functions; to be
+       extensively revised in later commits.
+       (main): Updated.
+
+       * src/ftinspect.pro: Add support for FreeType and dependent
+       libraries.  Right now, you have to adjust paths manually.
+
+2016-05-02  Werner Lemberg  <address@hidden>
+
        [ftinspect] Minor.
 
        * src/ftinspect.h, src/ftinspect.cpp:
diff --git a/src/ftinspect.cpp b/src/ftinspect.cpp
index b99fbcd..aed4279 100644
--- a/src/ftinspect.cpp
+++ b/src/ftinspect.cpp
@@ -8,6 +8,93 @@
 #define VERSION "X.Y.Z"
 
 
+// The face requester is a function provided by the client application to
+// the cache manager to translate an `abstract' face ID into a real
+// `FT_Face' object.
+//
+// Here, the face IDs are simply pointers to `Font' objects.
+
+static FT_Error
+faceRequester(FTC_FaceID faceID,
+              FT_Library library,
+              FT_Pointer /* requestData */,
+              FT_Face* faceP)
+{
+  Font* font = static_cast<Font*>(faceID);
+
+  return FT_New_Face(library,
+                     font->filePathname,
+                     font->faceIndex,
+                     faceP);
+}
+
+
+Engine::Engine()
+{
+  FT_Error error;
+
+  error = FT_Init_FreeType(&library);
+  if (error)
+  {
+    // XXX error handling
+  }
+
+  error = FTC_Manager_New(library, 0, 0, 0,
+                          faceRequester, 0, &cacheManager);
+  if (error)
+  {
+    // XXX error handling
+  }
+
+  error = FTC_SBitCache_New(cacheManager, &sbitsCache);
+  if (error)
+  {
+    // XXX error handling
+  }
+
+  error = FTC_ImageCache_New(cacheManager, &imageCache);
+  if (error)
+  {
+    // XXX error handling
+  }
+}
+
+
+void
+Engine::update(const MainGUI& gui)
+{
+  dpi = gui.dpiSpinBox->value();
+  zoom = gui.zoomSpinBox->value();
+
+  if (gui.unitsComboBox->currentIndex() == MainGUI::Units_px)
+  {
+    pointSize = gui.sizeDoubleSpinBox->value();
+    pixelSize = pointSize * dpi / 72.0;
+  }
+  else
+  {
+    pixelSize = gui.sizeDoubleSpinBox->value();
+    pointSize = pixelSize * 72.0 / dpi;
+  }
+
+  doHorizontalHinting = gui.horizontalHintingCheckBox->isChecked();
+  doVerticalHinting = gui.verticalHintingCheckBox->isChecked();
+  doBlueZoneHinting = gui.blueZoneHintingCheckBox->isChecked();
+  showSegments = gui.segmentDrawingCheckBox->isChecked();
+  doWarping = gui.warpingCheckBox->isChecked();
+
+  showBitmap = gui.showBitmapCheckBox->isChecked();
+  showPoints = gui.showPointsCheckBox->isChecked();
+  if (showPoints)
+    showPointIndices = gui.showPointIndicesCheckBox->isChecked();
+  else
+    showPointIndices = false;
+  showOutlines = gui.showOutlinesCheckBox->isChecked();
+
+  gamma = gui.gammaSlider->value();
+}
+
+
 MainGUI::MainGUI()
 {
   createLayout();
@@ -534,7 +621,10 @@ main(int argc,
   app.setOrganizationName("FreeType");
   app.setOrganizationDomain("freetype.org");
 
+  Engine engine;
   MainGUI gui;
+
+  engine.update(gui);
   gui.show();
 
   return app.exec();
diff --git a/src/ftinspect.h b/src/ftinspect.h
index 79b715a..63434b0 100644
--- a/src/ftinspect.h
+++ b/src/ftinspect.h
@@ -3,6 +3,10 @@
 #ifndef FTINSPECT_H_
 #define FTINSPECT_H_
 
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_CACHE_H
+
 #include <QAction>
 #include <QApplication>
 #include <QButtonGroup>
@@ -32,6 +36,51 @@
 #include <QWidget>
 
 
+class MainGUI;
+
+
+struct Font
+{
+  const char* filePathname;
+  int faceIndex;
+  int numIndices;
+  size_t fileSize;
+};
+
+
+class Engine
+{
+public:
+  Engine();
+
+  void update(const MainGUI&);
+
+private:
+  FT_Library library;
+  FTC_Manager cacheManager;
+  FTC_ImageCache imageCache;
+  FTC_SBitCache sbitsCache;
+
+  double pointSize;
+  double pixelSize;
+  int dpi;
+  int zoom;
+
+  bool doHorizontalHinting;
+  bool doVerticalHinting;
+  bool doBlueZoneHinting;
+  bool showSegments;
+  bool doWarping;
+
+  bool showBitmap;
+  bool showPoints;
+  bool showPointIndices;
+  bool showOutlines;
+
+  double gamma;
+};
+
+
 class MainGUI
 : public QMainWindow
 {
@@ -41,6 +90,8 @@ public:
   MainGUI();
   ~MainGUI();
 
+  friend class Engine;
+
 protected:
   void closeEvent(QCloseEvent*);
 
diff --git a/src/ftinspect.pro b/src/ftinspect.pro
index 63483a9..3ff8310 100644
--- a/src/ftinspect.pro
+++ b/src/ftinspect.pro
@@ -1,3 +1,20 @@
+INCLUDEPATH += ../../freetype2/include
+
+# To avoid conflicts with the FreeType version compiled into or used by Qt,
+# we use the static library.
+#
+# You should adapt this to your setup.
+unix|macx {
+  LIBS += ../../freetype2/objs/libfreetype.a
+
+  CONFIG += link_pkgconfig
+  PKGCONFIG += libpng harfbuzz zlib bzip2
+}
+win32 {
+  LIBS += ../../freetyp2/objs/vc2010/freetype263.lib
+  LIBS += -lpng -lharfbuzz -lz -lbz2 -lm
+}
+
 CONFIG += qt debug
 
 SOURCES += ftinspect.cpp