Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 351 insertions, 0 deletions

diff --git a/src/3rdparty/freetype/src/base/ftlcdfil.c b/src/3rdparty/freetype/src/base/ftlcdfil.c
new file mode 100644
index 0000000000..80640111c4
--- /dev/null
+++ b/src/3rdparty/freetype/src/base/ftlcdfil.c
@@ -0,0 +1,351 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ftlcdfil.c                                                             */
+/*                                                                         */
+/*    FreeType API for color filtering of subpixel bitmap glyphs (body).   */
+/*                                                                         */
+/*  Copyright 2006, 2008, 2009 by                                          */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_LCD_FILTER_H
+#include FT_IMAGE_H
+#include FT_INTERNAL_OBJECTS_H
+
+
+#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+
+/* define USE_LEGACY to implement the legacy filter */
+#define  USE_LEGACY
+
+  /* FIR filter used by the default and light filters */
+  static void
+  _ft_lcd_filter_fir( FT_Bitmap*      bitmap,
+                      FT_Render_Mode  mode,
+                      FT_Library      library )
+  {
+    FT_Byte*  weights = library->lcd_weights;
+    FT_UInt   width   = (FT_UInt)bitmap->width;
+    FT_UInt   height  = (FT_UInt)bitmap->rows;
+
+
+    /* horizontal in-place FIR filter */
+    if ( mode == FT_RENDER_MODE_LCD && width >= 4 )
+    {
+      FT_Byte*  line = bitmap->buffer;
+
+
+      for ( ; height > 0; height--, line += bitmap->pitch )
+      {
+        FT_UInt  fir[5];
+        FT_UInt  val1, xx;
+
+
+        val1   = line[0];
+        fir[0] = weights[2] * val1;
+        fir[1] = weights[3] * val1;
+        fir[2] = weights[4] * val1;
+        fir[3] = 0;
+        fir[4] = 0;
+
+        val1    = line[1];
+        fir[0] += weights[1] * val1;
+        fir[1] += weights[2] * val1;
+        fir[2] += weights[3] * val1;
+        fir[3] += weights[4] * val1;
+
+        for ( xx = 2; xx < width; xx++ )
+        {
+          FT_UInt  val, pix;
+
+
+          val    = line[xx];
+          pix    = fir[0] + weights[0] * val;
+          fir[0] = fir[1] + weights[1] * val;
+          fir[1] = fir[2] + weights[2] * val;
+          fir[2] = fir[3] + weights[3] * val;
+          fir[3] =          weights[4] * val;
+
+          pix        >>= 8;
+          pix         |= -( pix >> 8 );
+          line[xx - 2] = (FT_Byte)pix;
+        }
+
+        {
+          FT_UInt  pix;
+
+
+          pix          = fir[0] >> 8;
+          pix         |= -( pix >> 8 );
+          line[xx - 2] = (FT_Byte)pix;
+
+          pix          = fir[1] >> 8;
+          pix         |= -( pix >> 8 );
+          line[xx - 1] = (FT_Byte)pix;
+        }
+      }
+    }
+
+    /* vertical in-place FIR filter */
+    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 4 )
+    {
+      FT_Byte*  column = bitmap->buffer;
+      FT_Int    pitch  = bitmap->pitch;
+
+
+      for ( ; width > 0; width--, column++ )
+      {
+        FT_Byte*  col = column;
+        FT_UInt   fir[5];
+        FT_UInt   val1, yy;
+
+
+        val1   = col[0];
+        fir[0] = weights[2] * val1;
+        fir[1] = weights[3] * val1;
+        fir[2] = weights[4] * val1;
+        fir[3] = 0;
+        fir[4] = 0;
+        col   += pitch;
+
+        val1    = col[0];
+        fir[0] += weights[1] * val1;
+        fir[1] += weights[2] * val1;
+        fir[2] += weights[3] * val1;
+        fir[3] += weights[4] * val1;
+        col    += pitch;
+
+        for ( yy = 2; yy < height; yy++ )
+        {
+          FT_UInt  val, pix;
+
+
+          val    = col[0];
+          pix    = fir[0] + weights[0] * val;
+          fir[0] = fir[1] + weights[1] * val;
+          fir[1] = fir[2] + weights[2] * val;
+          fir[2] = fir[3] + weights[3] * val;
+          fir[3] =          weights[4] * val;
+
+          pix           >>= 8;
+          pix            |= -( pix >> 8 );
+          col[-2 * pitch] = (FT_Byte)pix;
+          col            += pitch;
+        }
+
+        {
+          FT_UInt  pix;
+
+
+          pix             = fir[0] >> 8;
+          pix            |= -( pix >> 8 );
+          col[-2 * pitch] = (FT_Byte)pix;
+
+          pix         = fir[1] >> 8;
+          pix        |= -( pix >> 8 );
+          col[-pitch] = (FT_Byte)pix;
+        }
+      }
+    }
+  }
+
+
+#ifdef USE_LEGACY
+
+  /* intra-pixel filter used by the legacy filter */
+  static void
+  _ft_lcd_filter_legacy( FT_Bitmap*      bitmap,
+                         FT_Render_Mode  mode,
+                         FT_Library      library )
+  {
+    FT_UInt  width  = (FT_UInt)bitmap->width;
+    FT_UInt  height = (FT_UInt)bitmap->rows;
+    FT_Int   pitch  = bitmap->pitch;
+
+    static const int  filters[3][3] =
+    {
+      { 65538 * 9/13, 65538 * 1/6, 65538 * 1/13 },
+      { 65538 * 3/13, 65538 * 4/6, 65538 * 3/13 },
+      { 65538 * 1/13, 65538 * 1/6, 65538 * 9/13 }
+    };
+
+    FT_UNUSED( library );
+
+
+    /* horizontal in-place intra-pixel filter */
+    if ( mode == FT_RENDER_MODE_LCD && width >= 3 )
+    {
+      FT_Byte*  line = bitmap->buffer;
+
+
+      for ( ; height > 0; height--, line += pitch )
+      {
+        FT_UInt  xx;
+
+
+        for ( xx = 0; xx < width; xx += 3 )
+        {
+          FT_UInt  r = 0;
+          FT_UInt  g = 0;
+          FT_UInt  b = 0;
+          FT_UInt  p;
+
+
+          p  = line[xx];
+          r += filters[0][0] * p;
+          g += filters[0][1] * p;
+          b += filters[0][2] * p;
+
+          p  = line[xx + 1];
+          r += filters[1][0] * p;
+          g += filters[1][1] * p;
+          b += filters[1][2] * p;
+
+          p  = line[xx + 2];
+          r += filters[2][0] * p;
+          g += filters[2][1] * p;
+          b += filters[2][2] * p;
+
+          line[xx]     = (FT_Byte)( r / 65536 );
+          line[xx + 1] = (FT_Byte)( g / 65536 );
+          line[xx + 2] = (FT_Byte)( b / 65536 );
+        }
+      }
+    }
+    else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 )
+    {
+      FT_Byte*  column = bitmap->buffer;
+
+
+      for ( ; width > 0; width--, column++ )
+      {
+        FT_Byte*  col     = column;
+        FT_Byte*  col_end = col + height * pitch;
+
+
+        for ( ; col < col_end; col += 3 * pitch )
+        {
+          FT_UInt  r = 0;
+          FT_UInt  g = 0;
+          FT_UInt  b = 0;
+          FT_UInt  p;
+
+
+          p  = col[0];
+          r += filters[0][0] * p;
+          g += filters[0][1] * p;
+          b += filters[0][2] * p;
+
+          p  = col[pitch];
+          r += filters[1][0] * p;
+          g += filters[1][1] * p;
+          b += filters[1][2] * p;
+
+          p  = col[pitch * 2];
+          r += filters[2][0] * p;
+          g += filters[2][1] * p;
+          b += filters[2][2] * p;
+
+          col[0]         = (FT_Byte)( r / 65536 );
+          col[pitch]     = (FT_Byte)( g / 65536 );
+          col[2 * pitch] = (FT_Byte)( b / 65536 );
+        }
+      }
+    }
+  }
+
+#endif /* USE_LEGACY */
+
+
+  FT_EXPORT_DEF( FT_Error )
+  FT_Library_SetLcdFilter( FT_Library     library,
+                           FT_LcdFilter   filter )
+  {
+    static const FT_Byte  light_filter[5] =
+                            { 0, 85, 86, 85, 0 };
+    /* the values here sum up to a value larger than 256, */
+    /* providing a cheap gamma correction                 */
+    static const FT_Byte  default_filter[5] =
+                            { 0x10, 0x40, 0x70, 0x40, 0x10 };
+
+
+    if ( library == NULL )
+      return FT_Err_Invalid_Argument;
+
+    switch ( filter )
+    {
+    case FT_LCD_FILTER_NONE:
+      library->lcd_filter_func = NULL;
+      library->lcd_extra       = 0;
+      break;
+
+    case FT_LCD_FILTER_DEFAULT:
+#if defined( FT_FORCE_LEGACY_LCD_FILTER )
+
+      library->lcd_filter_func = _ft_lcd_filter_legacy;
+      library->lcd_extra       = 0;
+
+#elif defined( FT_FORCE_LIGHT_LCD_FILTER )
+
+      ft_memcpy( library->lcd_weights, light_filter, 5 );
+      library->lcd_filter_func = _ft_lcd_filter_fir;
+      library->lcd_extra       = 2;
+
+#else
+
+      ft_memcpy( library->lcd_weights, default_filter, 5 );
+      library->lcd_filter_func = _ft_lcd_filter_fir;
+      library->lcd_extra       = 2;
+
+#endif
+
+      break;
+
+    case FT_LCD_FILTER_LIGHT:
+      ft_memcpy( library->lcd_weights, light_filter, 5 );
+      library->lcd_filter_func = _ft_lcd_filter_fir;
+      library->lcd_extra       = 2;
+      break;
+
+#ifdef USE_LEGACY
+
+    case FT_LCD_FILTER_LEGACY:
+      library->lcd_filter_func = _ft_lcd_filter_legacy;
+      library->lcd_extra       = 0;
+      break;
+
+#endif
+
+    default:
+      return FT_Err_Invalid_Argument;
+    }
+
+    library->lcd_filter = filter;
+    return 0;
+  }
+
+#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+  FT_EXPORT_DEF( FT_Error )
+  FT_Library_SetLcdFilter( FT_Library    library,
+                           FT_LcdFilter  filter )
+  {
+    FT_UNUSED( library );
+    FT_UNUSED( filter );
+
+    return FT_Err_Unimplemented_Feature;
+  }
+
+#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+
+/* END */