ref: cb7a5122e15d3013bd51cfedc8e5d723b6e2e33c
dir: /src/raster/ftrend1.c/
/***************************************************************************/ /* */ /* ftrend1.c */ /* */ /* The FreeType glyph rasterizer interface (body). */ /* */ /* Copyright 1996-2015 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 "ftrend1.h" #include "ftraster.h" #include "rastpic.h" #include "rasterrs.h" /* initialize renderer -- init its raster */ static FT_Error ft_raster1_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 FT_Err_Ok; } /* set render-specific mode */ static FT_Error ft_raster1_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_raster1_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_raster1_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_raster1_render( FT_Renderer render, FT_GlyphSlot slot, FT_Render_Mode mode, const FT_Vector* origin ) { FT_Error error; FT_Outline* outline; FT_BBox cbox, cbox0; FT_UInt width, height, pitch; FT_Bitmap* bitmap; FT_Memory memory; FT_Raster_Params params; /* check glyph image format */ if ( slot->format != render->glyph_format ) { error = FT_THROW( Invalid_Argument ); goto Exit; } /* check rendering mode */ if ( mode != FT_RENDER_MODE_MONO ) { /* raster1 is only capable of producing monochrome bitmaps */ return FT_THROW( Cannot_Render_Glyph ); } outline = &slot->outline; /* translate the outline to the new origin if needed */ if ( origin ) FT_Outline_Translate( outline, origin->x, origin->y ); /* compute the control box, and grid fit it */ FT_Outline_Get_CBox( outline, &cbox0 ); /* undocumented but confirmed: bbox values get rounded */ #if 1 cbox.xMin = FT_PIX_ROUND( cbox0.xMin ); cbox.yMin = FT_PIX_ROUND( cbox0.yMin ); cbox.xMax = FT_PIX_ROUND( cbox0.xMax ); cbox.yMax = FT_PIX_ROUND( cbox0.yMax ); #else cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); cbox.xMax = FT_PIX_CEIL( cbox.xMax ); cbox.yMax = FT_PIX_CEIL( cbox.yMax ); #endif /* If either `width' or `height' round to 0, try */ /* explicitly rounding up/down. In the case of */ /* glyphs containing only one very narrow feature, */ /* this gives the drop-out compensation in the scan */ /* conversion code a chance to do its stuff. */ width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); if ( width == 0 ) { cbox.xMin = FT_PIX_FLOOR( cbox0.xMin ); cbox.xMax = FT_PIX_CEIL( cbox0.xMax ); width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); } height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); if ( height == 0 ) { cbox.yMin = FT_PIX_FLOOR( cbox0.yMin ); cbox.yMax = FT_PIX_CEIL( cbox0.yMax ); height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); } if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX ) { error = FT_THROW( Invalid_Argument ); goto Exit; } bitmap = &slot->bitmap; memory = render->root.memory; /* release old bitmap buffer */ if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) { FT_FREE( bitmap->buffer ); slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; } pitch = ( ( width + 15 ) >> 4 ) << 1; bitmap->pixel_mode = FT_PIXEL_MODE_MONO; bitmap->width = width; bitmap->rows = height; bitmap->pitch = (int)pitch; if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) ) goto Exit; slot->internal->flags |= FT_GLYPH_OWN_BITMAP; /* translate outline to render it into the bitmap */ FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); /* set up parameters */ params.target = bitmap; params.source = outline; params.flags = 0; /* render outline into the bitmap */ error = render->raster_render( render->raster, ¶ms ); FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); if ( error ) goto Exit; slot->format = FT_GLYPH_FORMAT_BITMAP; slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); Exit: return error; } FT_DEFINE_RENDERER( ft_raster1_renderer_class, FT_MODULE_RENDERER, sizeof ( FT_RendererRec ), "raster1", 0x10000L, 0x20000L, 0, /* module specific interface */ (FT_Module_Constructor)ft_raster1_init, (FT_Module_Destructor) 0, (FT_Module_Requester) 0 , FT_GLYPH_FORMAT_OUTLINE, (FT_Renderer_RenderFunc) ft_raster1_render, (FT_Renderer_TransformFunc)ft_raster1_transform, (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, (FT_Renderer_SetModeFunc) ft_raster1_set_mode, (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET ) /* END */