2022-11-18 20:54:19 +01:00
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/** The 'dense' renderer */
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2022-11-18 08:48:54 +01:00
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2022-11-18 20:54:19 +01:00
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#include <freetype/ftoutln.h>
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftobjs.h>
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#include "ftdenserend.h"
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#include "ftdense.h"
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#include "ftdenseerrs.h"
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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#undef FT_COMPONENT
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#define FT_COMPONENT dense
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/**************************************************************************
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*
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* interface functions
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*
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*/
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/* set render specific modes or attributes */
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static FT_Error
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ft_dense_set_mode( FT_Renderer render, FT_ULong mode_tag, FT_Pointer data )
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{
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/* pass it to the rasterizer */
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return render->clazz->raster_class->raster_set_mode( render->raster, mode_tag,
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data );
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}
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/* transform the glyph using matrix and/or delta */
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static FT_Error
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ft_dense_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 control box of a glyph's outline */
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static void
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ft_dense_get_cbox( FT_Renderer render, FT_GlyphSlot slot, FT_BBox* cbox )
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{
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FT_ZERO( 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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static FT_Error
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ft_dense_init( FT_Renderer render )
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{
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return FT_Err_Ok;
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}
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static void
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ft_dense_done( FT_Renderer render )
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{
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FT_UNUSED( render );
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}
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/* generate bitmap from a glyph's slot image */
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static FT_Error
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ft_dense_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 = FT_Err_Ok;
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FT_Outline* outline = &slot->outline;
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FT_Bitmap* bitmap = &slot->bitmap;
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/* FT_FREE and FT_ALLOC_MULT macros need a variable named 'memory' */
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FT_Memory memory = render->root.memory;
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FT_Pos x_shift = 0;
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FT_Pos y_shift = 0;
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FT_Raster_Params params;
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/* check whether slot format is correct before rendering */
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if ( slot->format != render->glyph_format )
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{
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error = FT_THROW( Invalid_Glyph_Format );
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goto Exit;
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}
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/* check mode */
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if ( mode != FT_RENDER_MODE_NORMAL &&
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mode != FT_RENDER_MODE_LIGHT &&
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mode != FT_RENDER_MODE_LCD &&
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mode != FT_RENDER_MODE_LCD_V )
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{
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error = FT_THROW( Cannot_Render_Glyph );
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goto Exit;
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}
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/* deallocate the previously allocated bitmap */
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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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/* preset the bitmap using the glyph's outline */
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if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
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{
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error = FT_THROW( Raster_Overflow );
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goto Exit;
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}
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if ( !bitmap->rows || !bitmap->pitch )
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goto Exit;
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/* allocate new one */
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if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
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goto Exit;
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slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
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/* Calculate shift in 26.6 format */
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x_shift = 64 * -slot->bitmap_left;
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y_shift = 64 * -slot->bitmap_top;
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if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
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y_shift += 64 * (FT_Int)bitmap->rows / 3;
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else
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y_shift += 64 * (FT_Int)bitmap->rows;
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if ( origin )
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{
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x_shift += origin->x;
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y_shift += origin->y;
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}
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/* translate outline to render it into the bitmap */
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if ( x_shift || y_shift )
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FT_Outline_Translate( outline, x_shift, y_shift );
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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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/* render the outline */
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error =
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render->raster_render( render->raster, (const FT_Raster_Params*)¶ms );
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Exit:
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if ( !error )
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{
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/* the glyph is successfully rendered to a bitmap */
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slot->format = FT_GLYPH_FORMAT_BITMAP;
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}
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else 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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if ( x_shift || y_shift )
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FT_Outline_Translate( outline, -x_shift, -y_shift );
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return error;
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}
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FT_DEFINE_RENDERER(
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ft_dense_renderer_class,
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FT_MODULE_RENDERER,
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sizeof( FT_RendererRec ),
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"dense",
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0x10000L,
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0x20000L,
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NULL,
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(FT_Module_Constructor)ft_dense_init,
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(FT_Module_Destructor)ft_dense_done,
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(FT_Module_Requester)NULL,
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc)ft_dense_render, /* render_glyph */
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(FT_Renderer_TransformFunc)ft_dense_transform, /* transform_glyph */
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(FT_Renderer_GetCBoxFunc)ft_dense_get_cbox, /* get_glyph_cbox */
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(FT_Renderer_SetModeFunc)ft_dense_set_mode, /* set_mode */
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(FT_Raster_Funcs*)&ft_dense_raster /* raster_class */
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)
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/* END */
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