255 lines
7.3 KiB
C
255 lines
7.3 KiB
C
/***************************************************************************/
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/* */
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/* ftrend1.c */
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/* */
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/* The FreeType glyph rasterizer interface (body). */
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/* */
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/* Copyright 1996-2016 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_OUTLINE_H
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#include "ftrend1.h"
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#include "ftraster.h"
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#include "rastpic.h"
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#include "rasterrs.h"
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/* initialize renderer -- init its raster */
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static FT_Error
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ft_raster1_init( FT_Renderer render )
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{
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FT_Library library = FT_MODULE_LIBRARY( render );
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render->clazz->raster_class->raster_reset( render->raster,
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library->raster_pool,
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library->raster_pool_size );
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return FT_Err_Ok;
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}
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/* set render-specific mode */
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static FT_Error
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ft_raster1_set_mode( FT_Renderer render,
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FT_ULong mode_tag,
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FT_Pointer data )
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{
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/* we simply pass it to the raster */
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return render->clazz->raster_class->raster_set_mode( render->raster,
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mode_tag,
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data );
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}
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/* transform a given glyph image */
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static FT_Error
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ft_raster1_transform( FT_Renderer render,
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FT_GlyphSlot slot,
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const FT_Matrix* matrix,
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const FT_Vector* delta )
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{
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FT_Error error = FT_Err_Ok;
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if ( slot->format != render->glyph_format )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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if ( matrix )
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FT_Outline_Transform( &slot->outline, matrix );
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if ( delta )
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FT_Outline_Translate( &slot->outline, delta->x, delta->y );
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Exit:
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return error;
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}
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/* return the glyph's control box */
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static void
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ft_raster1_get_cbox( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_BBox* cbox )
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{
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FT_MEM_ZERO( cbox, sizeof ( *cbox ) );
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if ( slot->format == render->glyph_format )
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FT_Outline_Get_CBox( &slot->outline, cbox );
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}
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/* convert a slot's glyph image into a bitmap */
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static FT_Error
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ft_raster1_render( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin )
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{
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FT_Error error;
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FT_Outline* outline;
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FT_BBox cbox, cbox0;
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FT_UInt width, height, pitch;
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FT_Bitmap* bitmap;
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FT_Memory memory;
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FT_Raster_Params params;
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/* check glyph image format */
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if ( slot->format != render->glyph_format )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* check rendering mode */
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if ( mode != FT_RENDER_MODE_MONO )
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{
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/* raster1 is only capable of producing monochrome bitmaps */
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return FT_THROW( Cannot_Render_Glyph );
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}
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outline = &slot->outline;
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/* translate the outline to the new origin if needed */
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if ( origin )
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FT_Outline_Translate( outline, origin->x, origin->y );
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/* compute the control box, and grid fit it */
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FT_Outline_Get_CBox( outline, &cbox0 );
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/* undocumented but confirmed: bbox values get rounded */
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#if 1
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cbox.xMin = FT_PIX_ROUND( cbox0.xMin );
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cbox.yMin = FT_PIX_ROUND( cbox0.yMin );
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cbox.xMax = FT_PIX_ROUND( cbox0.xMax );
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cbox.yMax = FT_PIX_ROUND( cbox0.yMax );
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#else
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cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
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cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
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cbox.xMax = FT_PIX_CEIL( cbox.xMax );
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cbox.yMax = FT_PIX_CEIL( cbox.yMax );
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#endif
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/* If either `width' or `height' round to 0, try */
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/* explicitly rounding up/down. In the case of */
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/* glyphs containing only one very narrow feature, */
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/* this gives the drop-out compensation in the scan */
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/* conversion code a chance to do its stuff. */
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width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
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if ( width == 0 )
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{
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cbox.xMin = FT_PIX_FLOOR( cbox0.xMin );
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cbox.xMax = FT_PIX_CEIL( cbox0.xMax );
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width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
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}
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height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
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if ( height == 0 )
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{
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cbox.yMin = FT_PIX_FLOOR( cbox0.yMin );
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cbox.yMax = FT_PIX_CEIL( cbox0.yMax );
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height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
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}
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if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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bitmap = &slot->bitmap;
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memory = render->root.memory;
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/* release old bitmap buffer */
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if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
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{
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FT_FREE( bitmap->buffer );
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slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
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}
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pitch = ( ( width + 15 ) >> 4 ) << 1;
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bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
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bitmap->width = width;
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bitmap->rows = height;
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bitmap->pitch = (int)pitch;
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if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
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goto Exit;
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slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
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/* translate outline to render it into the bitmap */
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FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
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/* set up parameters */
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params.target = bitmap;
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params.source = outline;
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params.flags = 0;
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/* render outline into the bitmap */
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error = render->raster_render( render->raster, ¶ms );
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FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
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if ( error )
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goto Exit;
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slot->format = FT_GLYPH_FORMAT_BITMAP;
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slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 );
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slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 );
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Exit:
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return error;
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}
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FT_DEFINE_RENDERER( ft_raster1_renderer_class,
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FT_MODULE_RENDERER,
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sizeof ( FT_RendererRec ),
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"raster1",
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0x10000L,
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0x20000L,
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0, /* module specific interface */
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(FT_Module_Constructor)ft_raster1_init,
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(FT_Module_Destructor) 0,
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(FT_Module_Requester) 0
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,
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_raster1_render,
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(FT_Renderer_TransformFunc)ft_raster1_transform,
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(FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox,
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(FT_Renderer_SetModeFunc) ft_raster1_set_mode,
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(FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET
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)
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/* END */
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