[freetype2-demos] master 88594be: [ftview] Implement cycling through available charmaps.

[Alexei Podtelezhnikov]

branch: master
commit 88594bed5a19eda821535fd89fec2287d011fe12
Author: Alexei Podtelezhnikov <address@hidden>
Commit: Alexei Podtelezhnikov <address@hidden>

    [ftview] Implement cycling through available charmaps.
    
    * src/ftview.c (event_change_encoding): New function.
    (Process_Event): New [Tab] event to cycle through available charmaps,
    also increase index steps to 16, 256, and 4096.
    (event_help): Updated.
---
 ChangeLog    |    9 ++++++++
 src/ftview.c |   66 ++++++++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 59 insertions(+), 16 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index acb406e..497574b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2016-10-05  Alexei Podtelezhnikov  <address@hidden>
+
+       [ftview] Implement cycling through available charmaps.
+
+       * src/ftview.c (event_change_encoding): New function.
+       (Process_Event): New [Tab] event to cycle through available charmaps,
+       also increase index steps to 16, 256, and 4096.
+       (event_help): Updated.
+
 2016-10-03  Alexei Podtelezhnikov  <address@hidden>
 
        * graph/grevents.h (grKey): Typo.
diff --git a/src/ftview.c b/src/ftview.c
index c649eee..8d46fb7 100644
--- a/src/ftview.c
+++ b/src/ftview.c
@@ -200,7 +200,7 @@
       FT_UInt  glyph_idx;
 
 
-      if ( handle->encoding == FT_ENCODING_NONE )
+      if ( status.encoding == FT_ENCODING_NONE )
         glyph_idx = (FT_UInt)i;
       else
         glyph_idx = FTDemo_Get_Index( handle, (FT_UInt32)i );
@@ -308,7 +308,7 @@
       FT_UInt  glyph_idx;
 
 
-      if ( handle->encoding == FT_ENCODING_NONE )
+      if ( status.encoding == FT_ENCODING_NONE )
         glyph_idx = (FT_UInt)i;
       else
         glyph_idx = FTDemo_Get_Index( handle, (FT_UInt32)i );
@@ -385,7 +385,7 @@
       FT_UInt  glyph_idx;
 
 
-      if ( handle->encoding == FT_ENCODING_NONE )
+      if ( status.encoding == FT_ENCODING_NONE )
         glyph_idx = (FT_UInt)i;
       else
         glyph_idx = FTDemo_Get_Index( handle, (FT_UInt32)i );
@@ -489,7 +489,7 @@
       FT_UInt  glyph_idx;
 
 
-      if ( handle->encoding == FT_ENCODING_NONE )
+      if ( status.encoding == FT_ENCODING_NONE )
         glyph_idx = (FT_UInt)i;
       else
         glyph_idx = FTDemo_Get_Index( handle, (FT_UInt32)i );
@@ -808,19 +808,19 @@
     grWriteln( "PgUp, PgDn  adjust size by 10 units                  (in mode 
4)            " );
     grWriteln( "                                                               
             " );
     grWriteln( "Left, Right adjust index by 1           L           cycle 
through           " );
-    grWriteln( "F7, F8      adjust index by 10                       LCD 
filtering          " );
-    grWriteln( "F9, F10     adjust index by 100         [, ]        select 
custom LCD       " );
-    grWriteln( "F11, F12    adjust index by 1000                      filter 
weight         " );
+    grWriteln( "F7, F8      adjust index by 16                       LCD 
filtering          " );
+    grWriteln( "F9, F10     adjust index by 256         [, ]        select 
custom LCD       " );
+    grWriteln( "F11, F12    adjust index by 4096                      filter 
weight         " );
     grWriteln( "                                                      (if 
custom filtering) " );
     grWriteln( "h           toggle hinting              -, +(=)     adjust 
selected custom  " );
     grWriteln( "H           cycle through hinting                    LCD 
filter weight      " );
     grWriteln( "             engines (if available)                            
             " );
     grWriteln( "f           toggle forced auto-         g, v        adjust 
gamma value      " );
     grWriteln( "             hinting (if hinting)                              
             " );
-    grWriteln( "w           toggle warping (in light                           
             " );
-    grWriteln( "             AA mode, if available)     q, ESC      quit 
ftview             " );
+    grWriteln( "w           toggle warping (in light    Tab         cycle 
through charmaps  " );
+    grWriteln( "             AA mode, if available)                            
             " );
     grWriteln( "                                                               
             " );
-    grWriteln( "a           toggle anti-aliasing                               
             " );
+    grWriteln( "a           toggle anti-aliasing        q, ESC      quit 
ftview             " );
     /*          |----------------------------------|    
|----------------------------------| */
     grLn();
     grLn();
@@ -1037,6 +1037,36 @@
 
 
   static int
+  event_encoding_change( void )
+  {
+    FT_Face     face;
+    static int  i = 0;
+
+    error = FTC_Manager_LookupFace( handle->cache_manager,
+                                    handle->scaler.face_id, &face );
+
+    if ( i < face->num_charmaps )
+    {
+      status.encoding = face->charmaps[i]->encoding;
+      status.offset   = 0x20;
+
+      FT_Set_Charmap( face, face->charmaps[i] );
+
+      i++;
+    }
+    else
+    {
+      status.encoding = 0;
+      status.offset   = 0;
+
+      i = 0;
+    }
+
+    return 1;
+  }
+
+
+  static int
   event_font_change( int  delta )
   {
     int  num_indices;
@@ -1195,6 +1225,10 @@
       status.update = 1;
       break;
 
+    case grKeyTab:
+      status.update = event_encoding_change();
+      break;
+
     case grKEY( 's' ):
       if ( status.render_mode == RENDER_MODE_SLANTED )
         status.update = event_slant_change( 0.02 );
@@ -1273,22 +1307,22 @@
       status.update = event_index_change( 1 );
       break;
     case grKeyF7:
-      status.update = event_index_change( -10 );
+      status.update = event_index_change( -0x10 );
       break;
     case grKeyF8:
-      status.update = event_index_change( 10 );
+      status.update = event_index_change( 0x10 );
       break;
     case grKeyF9:
-      status.update = event_index_change( -100 );
+      status.update = event_index_change( -0x100 );
       break;
     case grKeyF10:
-      status.update = event_index_change( 100 );
+      status.update = event_index_change( 0x100 );
       break;
     case grKeyF11:
-      status.update = event_index_change( -1000 );
+      status.update = event_index_change( -0x1000 );
       break;
     case grKeyF12:
-      status.update = event_index_change( 1000 );
+      status.update = event_index_change( 0x1000 );
       break;
 
     case grKEY( 'L' ):