Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/smooth/ftsmooth.c

Index: third_party/freetype2/src/src/smooth/ftsmooth.c
diff --git a/third_party/freetype2/src/src/smooth/ftsmooth.c b/third_party/freetype2/src/src/smooth/ftsmooth.c
new file mode 100644
index 0000000000000000000000000000000000000000..3620550534022444cb4b25195eb9be635f6b9d12
--- /dev/null
+++ b/third_party/freetype2/src/src/smooth/ftsmooth.c
@@ -0,0 +1,511 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ftsmooth.c                                                             */
+/*                                                                         */
+/*    Anti-aliasing renderer interface (body).                             */
+/*                                                                         */
+/*  Copyright 2000-2015 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_INTERNAL_DEBUG_H
+#include FT_INTERNAL_OBJECTS_H
+#include FT_OUTLINE_H
+#include "ftsmooth.h"
+#include "ftgrays.h"
+#include "ftspic.h"
+
+#include "ftsmerrs.h"
+
+
+  /* initialize renderer -- init its raster */
+  static FT_Error
+  ft_smooth_init( FT_Renderer  render )
+  {
+    FT_Library  library = FT_MODULE_LIBRARY( render );
+
+
+    render->clazz->raster_class->raster_reset( render->raster,
+                                               library->raster_pool,
+                                               library->raster_pool_size );
+
+    return 0;
+  }
+
+
+  /* sets render-specific mode */
+  static FT_Error
+  ft_smooth_set_mode( FT_Renderer  render,
+                      FT_ULong     mode_tag,
+                      FT_Pointer   data )
+  {
+    /* we simply pass it to the raster */
+    return render->clazz->raster_class->raster_set_mode( render->raster,
+                                                         mode_tag,
+                                                         data );
+  }
+
+  /* transform a given glyph image */
+  static FT_Error
+  ft_smooth_transform( FT_Renderer       render,
+                       FT_GlyphSlot      slot,
+                       const FT_Matrix*  matrix,
+                       const FT_Vector*  delta )
+  {
+    FT_Error  error = FT_Err_Ok;
+
+
+    if ( slot->format != render->glyph_format )
+    {
+      error = FT_THROW( Invalid_Argument );
+      goto Exit;
+    }
+
+    if ( matrix )
+      FT_Outline_Transform( &slot->outline, matrix );
+
+    if ( delta )
+      FT_Outline_Translate( &slot->outline, delta->x, delta->y );
+
+  Exit:
+    return error;
+  }
+
+
+  /* return the glyph's control box */
+  static void
+  ft_smooth_get_cbox( FT_Renderer   render,
+                      FT_GlyphSlot  slot,
+                      FT_BBox*      cbox )
+  {
+    FT_MEM_ZERO( cbox, sizeof ( *cbox ) );
+
+    if ( slot->format == render->glyph_format )
+      FT_Outline_Get_CBox( &slot->outline, cbox );
+  }
+
+
+  /* convert a slot's glyph image into a bitmap */
+  static FT_Error
+  ft_smooth_render_generic( FT_Renderer       render,
+                            FT_GlyphSlot      slot,
+                            FT_Render_Mode    mode,
+                            const FT_Vector*  origin,
+                            FT_Render_Mode    required_mode )
+  {
+    FT_Error     error;
+    FT_Outline*  outline = &slot->outline;
+    FT_Bitmap*   bitmap  = &slot->bitmap;
+    FT_Memory    memory  = render->root.memory;
+    FT_BBox      cbox;
+    FT_Pos       x_shift = 0;
+    FT_Pos       y_shift = 0;
+    FT_Pos       x_left, y_top;
+    FT_Pos       width, height, pitch;
+#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+    FT_Pos       height_org, width_org;
+#endif
+    FT_Int       hmul    = mode == FT_RENDER_MODE_LCD;
+    FT_Int       vmul    = mode == FT_RENDER_MODE_LCD_V;
+
+    FT_Raster_Params  params;
+
+    FT_Bool  have_outline_shifted = FALSE;
+    FT_Bool  have_buffer          = FALSE;
+
+
+    /* check glyph image format */
+    if ( slot->format != render->glyph_format )
+    {
+      error = FT_THROW( Invalid_Argument );
+      goto Exit;
+    }
+
+    /* check mode */
+    if ( mode != required_mode )
+    {
+      error = FT_THROW( Cannot_Render_Glyph );
+      goto Exit;
+    }
+
+    if ( origin )
+    {
+      x_shift = origin->x;
+      y_shift = origin->y;
+    }
+
+    /* compute the control box, and grid fit it */
+    /* taking into account the origin shift     */
+    FT_Outline_Get_CBox( outline, &cbox );
+
+    cbox.xMin = FT_PIX_FLOOR( cbox.xMin + x_shift );
+    cbox.yMin = FT_PIX_FLOOR( cbox.yMin + y_shift );
+    cbox.xMax = FT_PIX_CEIL( cbox.xMax + x_shift );
+    cbox.yMax = FT_PIX_CEIL( cbox.yMax + y_shift );
+
+    x_shift -= cbox.xMin;
+    y_shift -= cbox.yMin;
+
+    x_left  = cbox.xMin >> 6;
+    y_top   = cbox.yMax >> 6;
+
+    width  = (FT_ULong)( cbox.xMax - cbox.xMin ) >> 6;
+    height = (FT_ULong)( cbox.yMax - cbox.yMin ) >> 6;
+
+#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+    width_org  = width;
+    height_org = height;
+#endif
+
+    pitch = width;
+    if ( hmul )
+    {
+      width *= 3;
+      pitch  = FT_PAD_CEIL( width, 4 );
+    }
+
+    if ( vmul )
+      height *= 3;
+
+#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+
+    if ( slot->library->lcd_filter_func )
+    {
+      FT_Int  extra = slot->library->lcd_extra;
+
+
+      if ( hmul )
+      {
+        x_shift += 64 * ( extra >> 1 );
+        x_left  -= extra >> 1;
+        width   += 3 * extra;
+        pitch    = FT_PAD_CEIL( width, 4 );
+      }
+
+      if ( vmul )
+      {
+        y_shift += 64 * ( extra >> 1 );
+        y_top   += extra >> 1;
+        height  += 3 * extra;
+      }
+    }
+
+#endif
+
+    /*
+     * XXX: on 16bit system, we return an error for huge bitmap
+     * to prevent an overflow.
+     */
+    if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX ||
+         x_left < FT_INT_MIN || y_top < FT_INT_MIN )
+    {
+      error = FT_THROW( Invalid_Pixel_Size );
+      goto Exit;
+    }
+
+    /* Required check is (pitch * height < FT_ULONG_MAX),        */
+    /* but we care realistic cases only.  Always pitch <= width. */
+    if ( width > 0x7FFF || height > 0x7FFF )
+    {
+      FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n",
+                 width, height ));
+      error = FT_THROW( Raster_Overflow );
+      goto Exit;
+    }
+
+    /* release old bitmap buffer */
+    if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
+    {
+      FT_FREE( bitmap->buffer );
+      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
+    }
+
+    /* allocate new one */
+    if ( FT_ALLOC( bitmap->buffer, (FT_ULong)( pitch * height ) ) )
+      goto Exit;
+    else
+      have_buffer = TRUE;
+
+    slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
+
+    slot->format      = FT_GLYPH_FORMAT_BITMAP;
+    slot->bitmap_left = (FT_Int)x_left;
+    slot->bitmap_top  = (FT_Int)y_top;
+
+    bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
+    bitmap->num_grays  = 256;
+    bitmap->width      = (unsigned int)width;
+    bitmap->rows       = (unsigned int)height;
+    bitmap->pitch      = pitch;
+
+    /* translate outline to render it into the bitmap */
+    if ( x_shift || y_shift )
+    {
+      FT_Outline_Translate( outline, x_shift, y_shift );
+      have_outline_shifted = TRUE;
+    }
+
+    /* set up parameters */
+    params.target = bitmap;
+    params.source = outline;
+    params.flags  = FT_RASTER_FLAG_AA;
+
+#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+
+    /* implode outline if needed */
+    {
+      FT_Vector*  points     = outline->points;
+      FT_Vector*  points_end = points + outline->n_points;
+      FT_Vector*  vec;
+
+
+      if ( hmul )
+        for ( vec = points; vec < points_end; vec++ )
+          vec->x *= 3;
+
+      if ( vmul )
+        for ( vec = points; vec < points_end; vec++ )
+          vec->y *= 3;
+    }
+
+    /* render outline into the bitmap */
+    error = render->raster_render( render->raster, &params );
+
+    /* deflate outline if needed */
+    {
+      FT_Vector*  points     = outline->points;
+      FT_Vector*  points_end = points + outline->n_points;
+      FT_Vector*  vec;
+
+
+      if ( hmul )
+        for ( vec = points; vec < points_end; vec++ )
+          vec->x /= 3;
+
+      if ( vmul )
+        for ( vec = points; vec < points_end; vec++ )
+          vec->y /= 3;
+    }
+
+    if ( error )
+      goto Exit;
+
+    if ( slot->library->lcd_filter_func )
+      slot->library->lcd_filter_func( bitmap, mode, slot->library );
+
+#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+    /* render outline into bitmap */
+    error = render->raster_render( render->raster, &params );
+    if ( error )
+      goto Exit;
+
+    /* expand it horizontally */
+    if ( hmul )
+    {
+      FT_Byte*  line = bitmap->buffer;
+      FT_UInt   hh;
+
+
+      for ( hh = height_org; hh > 0; hh--, line += pitch )
+      {
+        FT_UInt   xx;
+        FT_Byte*  end = line + width;
+
+
+        for ( xx = width_org; xx > 0; xx-- )
+        {
+          FT_UInt  pixel = line[xx-1];
+
+
+          end[-3] = (FT_Byte)pixel;
+          end[-2] = (FT_Byte)pixel;
+          end[-1] = (FT_Byte)pixel;
+          end    -= 3;
+        }
+      }
+    }
+
+    /* expand it vertically */
+    if ( vmul )
+    {
+      FT_Byte*  read  = bitmap->buffer + ( height - height_org ) * pitch;
+      FT_Byte*  write = bitmap->buffer;
+      FT_UInt   hh;
+
+
+      for ( hh = height_org; hh > 0; hh-- )
+      {
+        ft_memcpy( write, read, pitch );
+        write += pitch;
+
+        ft_memcpy( write, read, pitch );
+        write += pitch;
+
+        ft_memcpy( write, read, pitch );
+        write += pitch;
+        read  += pitch;
+      }
+    }
+
+#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+    /* everything is fine; don't deallocate buffer */
+    have_buffer = FALSE;
+
+    error = FT_Err_Ok;
+
+  Exit:
+    if ( have_outline_shifted )
+      FT_Outline_Translate( outline, -x_shift, -y_shift );
+    if ( have_buffer )
+    {
+      FT_FREE( bitmap->buffer );
+      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
+    }
+
+    return error;
+  }
+
+
+  /* convert a slot's glyph image into a bitmap */
+  static FT_Error
+  ft_smooth_render( FT_Renderer       render,
+                    FT_GlyphSlot      slot,
+                    FT_Render_Mode    mode,
+                    const FT_Vector*  origin )
+  {
+    if ( mode == FT_RENDER_MODE_LIGHT )
+      mode = FT_RENDER_MODE_NORMAL;
+
+    return ft_smooth_render_generic( render, slot, mode, origin,
+                                     FT_RENDER_MODE_NORMAL );
+  }
+
+
+  /* convert a slot's glyph image into a horizontal LCD bitmap */
+  static FT_Error
+  ft_smooth_render_lcd( FT_Renderer       render,
+                        FT_GlyphSlot      slot,
+                        FT_Render_Mode    mode,
+                        const FT_Vector*  origin )
+  {
+    FT_Error  error;
+
+    error = ft_smooth_render_generic( render, slot, mode, origin,
+                                      FT_RENDER_MODE_LCD );
+    if ( !error )
+      slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD;
+
+    return error;
+  }
+
+
+  /* convert a slot's glyph image into a vertical LCD bitmap */
+  static FT_Error
+  ft_smooth_render_lcd_v( FT_Renderer       render,
+                          FT_GlyphSlot      slot,
+                          FT_Render_Mode    mode,
+                          const FT_Vector*  origin )
+  {
+    FT_Error  error;
+
+    error = ft_smooth_render_generic( render, slot, mode, origin,
+                                      FT_RENDER_MODE_LCD_V );
+    if ( !error )
+      slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V;
+
+    return error;
+  }
+
+
+  FT_DEFINE_RENDERER( ft_smooth_renderer_class,
+
+      FT_MODULE_RENDERER,
+      sizeof ( FT_RendererRec ),
+
+      "smooth",
+      0x10000L,
+      0x20000L,
+
+      0,    /* module specific interface */
+
+      (FT_Module_Constructor)ft_smooth_init,
+      (FT_Module_Destructor) 0,
+      (FT_Module_Requester)  0
+    ,
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Renderer_RenderFunc)   ft_smooth_render,
+    (FT_Renderer_TransformFunc)ft_smooth_transform,
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+
+    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+  )
+
+
+  FT_DEFINE_RENDERER( ft_smooth_lcd_renderer_class,
+
+      FT_MODULE_RENDERER,
+      sizeof ( FT_RendererRec ),
+
+      "smooth-lcd",
+      0x10000L,
+      0x20000L,
+
+      0,    /* module specific interface */
+
+      (FT_Module_Constructor)ft_smooth_init,
+      (FT_Module_Destructor) 0,
+      (FT_Module_Requester)  0
+    ,
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd,
+    (FT_Renderer_TransformFunc)ft_smooth_transform,
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+
+    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+  )
+
+  FT_DEFINE_RENDERER( ft_smooth_lcdv_renderer_class,
+
+      FT_MODULE_RENDERER,
+      sizeof ( FT_RendererRec ),
+
+      "smooth-lcdv",
+      0x10000L,
+      0x20000L,
+
+      0,    /* module specific interface */
+
+      (FT_Module_Constructor)ft_smooth_init,
+      (FT_Module_Destructor) 0,
+      (FT_Module_Requester)  0
+    ,
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Renderer_RenderFunc)   ft_smooth_render_lcd_v,
+    (FT_Renderer_TransformFunc)ft_smooth_transform,
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,
+
+    (FT_Raster_Funcs*)    &FT_GRAYS_RASTER_GET
+  )
+
+
+/* END */