kc3-lang/freetype/src/smooth/ftsmooth.c

Branch : - branch - master v2.13 - tag -

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• Author : Werner Lemberg
  Date : 2019-12-13 23:56:25
  Hash : 2c9a2d58
  Message : Another bunch of UBSan warnings on adding offsets to nullptr. Reported as https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19427 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19433 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19441 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19451 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19452 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19457 * src/autofit/aflatin.c (af_latin_hints_compute_segments, af_latin_hints_compute_edges): Use `FT_OFFSET'. * src/base/ftstream.c (FT_Stream_EnterFrame): Use `FT_OFFSET'. * src/psaux/cffdecode.c (cff_decoder_parse_charstrings): Exit early if there is no charstring. * src/psaux/psobjs.c (t1_decrypt): Use `FT_OFFSET'. * src/smooth/ftsmooth.c (ft_smooth_render_generic): Exit early for zero bitmap dimensions.

• src/smooth/ftsmooth.c

• /****************************************************************************
   *
   * ftsmooth.c
   *
   *   Anti-aliasing renderer interface (body).
   *
   * Copyright (C) 2000-2019 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 "ftsmerrs.h"
  
  
    /* initialize renderer -- init its raster */
    static FT_Error
    ft_smooth_init( FT_Renderer  render )
    {
  
  #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
  
      FT_Vector*  sub = render->root.library->lcd_geometry;
  
  
      /* set up default subpixel geometry for striped RGB panels. */
      sub[0].x = -21;
      sub[0].y = 0;
      sub[1].x = 0;
      sub[1].y = 0;
      sub[2].x = 21;
      sub[2].y = 0;
  
  #elif 0   /* or else, once ClearType patents expire */
  
      FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
  
  #endif
  
      render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
  
      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_ZERO( 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_Err_Ok;
      FT_Outline*  outline = &slot->outline;
      FT_Bitmap*   bitmap  = &slot->bitmap;
      FT_Memory    memory  = render->root.memory;
      FT_Pos       x_shift = 0;
      FT_Pos       y_shift = 0;
      FT_Int       hmul    = ( mode == FT_RENDER_MODE_LCD );
      FT_Int       vmul    = ( mode == FT_RENDER_MODE_LCD_V );
  
      FT_Raster_Params  params;
  
  
      /* 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;
      }
  
      /* release old bitmap buffer */
      if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
      {
        FT_FREE( bitmap->buffer );
        slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
      }
  
      if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
      {
        error = FT_THROW( Raster_Overflow );
        goto Exit;
      }
  
      if ( !bitmap->rows || !bitmap->pitch )
        goto Exit;
  
      /* allocate new one */
      if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
        goto Exit;
  
      slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
  
      x_shift = 64 * -slot->bitmap_left;
      y_shift = 64 * -slot->bitmap_top;
      if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
        y_shift += 64 * (FT_Int)bitmap->rows / 3;
      else
        y_shift += 64 * (FT_Int)bitmap->rows;
  
      if ( origin )
      {
        x_shift += origin->x;
        y_shift += origin->y;
      }
  
      /* translate outline to render it into the bitmap */
      if ( x_shift || y_shift )
        FT_Outline_Translate( outline, x_shift, y_shift );
  
      /* 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 = FT_OFFSET( 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 = FT_OFFSET( 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;
  
      /* finally apply filtering */
      if ( hmul || vmul )
      {
        FT_Byte*                 lcd_weights;
        FT_Bitmap_LcdFilterFunc  lcd_filter_func;
  
  
        /* Per-face LCD filtering takes priority if set up. */
        if ( slot->face && slot->face->internal->lcd_filter_func )
        {
          lcd_weights     = slot->face->internal->lcd_weights;
          lcd_filter_func = slot->face->internal->lcd_filter_func;
        }
        else
        {
          lcd_weights     = slot->library->lcd_weights;
          lcd_filter_func = slot->library->lcd_filter_func;
        }
  
        if ( lcd_filter_func )
          lcd_filter_func( bitmap, lcd_weights );
      }
  
  #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
  
      if ( hmul )  /* lcd */
      {
        FT_Byte*  line;
        FT_Byte*  temp = NULL;
        FT_UInt   i, j;
  
        unsigned int  height = bitmap->rows;
        unsigned int  width  = bitmap->width;
        int           pitch  = bitmap->pitch;
  
        FT_Vector*  sub = slot->library->lcd_geometry;
  
  
        /* Render 3 separate monochrome bitmaps, shifting the outline.  */
        width /= 3;
  
        FT_Outline_Translate( outline,
                              -sub[0].x,
                              -sub[0].y );
        error = render->raster_render( render->raster, &params );
        if ( error )
          goto Exit;
  
        bitmap->buffer += width;
        FT_Outline_Translate( outline,
                              sub[0].x - sub[1].x,
                              sub[0].y - sub[1].y );
        error = render->raster_render( render->raster, &params );
        bitmap->buffer -= width;
        if ( error )
          goto Exit;
  
        bitmap->buffer += 2 * width;
        FT_Outline_Translate( outline,
                              sub[1].x - sub[2].x,
                              sub[1].y - sub[2].y );
        error = render->raster_render( render->raster, &params );
        bitmap->buffer -= 2 * width;
        if ( error )
          goto Exit;
  
        x_shift -= sub[2].x;
        y_shift -= sub[2].y;
  
        /* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD.    */
        /* XXX: It is more efficient to render every third byte above. */
  
        if ( FT_ALLOC( temp, (FT_ULong)pitch ) )
          goto Exit;
  
        for ( i = 0; i < height; i++ )
        {
          line = bitmap->buffer + i * (FT_ULong)pitch;
          for ( j = 0; j < width; j++ )
          {
            temp[3 * j    ] = line[j];
            temp[3 * j + 1] = line[j + width];
            temp[3 * j + 2] = line[j + width + width];
          }
          FT_MEM_COPY( line, temp, pitch );
        }
  
        FT_FREE( temp );
      }
      else if ( vmul )  /* lcd_v */
      {
        int  pitch  = bitmap->pitch;
  
        FT_Vector*  sub = slot->library->lcd_geometry;
  
  
        /* Render 3 separate monochrome bitmaps, shifting the outline. */
        /* Notice that the subpixel geometry vectors are rotated.      */
        /* Triple the pitch to render on each third row.               */
        bitmap->pitch *= 3;
        bitmap->rows  /= 3;
  
        FT_Outline_Translate( outline,
                              -sub[0].y,
                              sub[0].x );
        error = render->raster_render( render->raster, &params );
        if ( error )
          goto Exit;
  
        bitmap->buffer += pitch;
        FT_Outline_Translate( outline,
                              sub[0].y - sub[1].y,
                              sub[1].x - sub[0].x );
        error = render->raster_render( render->raster, &params );
        bitmap->buffer -= pitch;
        if ( error )
          goto Exit;
  
        bitmap->buffer += 2 * pitch;
        FT_Outline_Translate( outline,
                              sub[1].y - sub[2].y,
                              sub[2].x - sub[1].x );
        error = render->raster_render( render->raster, &params );
        bitmap->buffer -= 2 * pitch;
        if ( error )
          goto Exit;
  
        x_shift -= sub[2].y;
        y_shift += sub[2].x;
  
        bitmap->pitch /= 3;
        bitmap->rows  *= 3;
      }
      else  /* grayscale */
        error = render->raster_render( render->raster, &params );
  
  #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
  
    Exit:
      if ( !error )
      {
        /* everything is fine; the glyph is now officially a bitmap */
        slot->format = FT_GLYPH_FORMAT_BITMAP;
      }
      else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
      {
        FT_FREE( bitmap->buffer );
        slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
      }
  
      if ( x_shift || y_shift )
        FT_Outline_Translate( outline, -x_shift, -y_shift );
  
      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 )
    {
      return ft_smooth_render_generic( render, slot, mode, origin,
                                       FT_RENDER_MODE_LCD );
    }
  
  
    /* 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 )
    {
      return ft_smooth_render_generic( render, slot, mode, origin,
                                       FT_RENDER_MODE_LCD_V );
    }
  
  
    FT_DEFINE_RENDERER(
      ft_smooth_renderer_class,
  
        FT_MODULE_RENDERER,
        sizeof ( FT_RendererRec ),
  
        "smooth",
        0x10000L,
        0x20000L,
  
        NULL,    /* module specific interface */
  
        (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
        (FT_Module_Destructor) NULL,            /* module_done   */
        (FT_Module_Requester)  NULL,            /* get_interface */
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render,     /* render_glyph    */
      (FT_Renderer_TransformFunc)ft_smooth_transform,  /* transform_glyph */
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,   /* get_glyph_cbox  */
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,   /* set_mode        */
  
      (FT_Raster_Funcs*)&ft_grays_raster               /* raster_class    */
    )
  
  
    FT_DEFINE_RENDERER(
      ft_smooth_lcd_renderer_class,
  
        FT_MODULE_RENDERER,
        sizeof ( FT_RendererRec ),
  
        "smooth-lcd",
        0x10000L,
        0x20000L,
  
        NULL,    /* module specific interface */
  
        (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
        (FT_Module_Destructor) NULL,            /* module_done   */
        (FT_Module_Requester)  NULL,            /* get_interface */
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render_lcd,  /* render_glyph    */
      (FT_Renderer_TransformFunc)ft_smooth_transform,   /* transform_glyph */
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,    /* get_glyph_cbox  */
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,    /* set_mode        */
  
      (FT_Raster_Funcs*)&ft_grays_raster                /* raster_class    */
    )
  
  
    FT_DEFINE_RENDERER(
      ft_smooth_lcdv_renderer_class,
  
        FT_MODULE_RENDERER,
        sizeof ( FT_RendererRec ),
  
        "smooth-lcdv",
        0x10000L,
        0x20000L,
  
        NULL,    /* module specific interface */
  
        (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
        (FT_Module_Destructor) NULL,            /* module_done   */
        (FT_Module_Requester)  NULL,            /* get_interface */
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_smooth_render_lcd_v,  /* render_glyph    */
      (FT_Renderer_TransformFunc)ft_smooth_transform,     /* transform_glyph */
      (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,      /* get_glyph_cbox  */
      (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,      /* set_mode        */
  
      (FT_Raster_Funcs*)&ft_grays_raster                  /* raster_class    */
    )
  
  
  /* END */