diff options
Diffstat (limited to '3rdparty/freetype/src/smooth/ftsmooth.c')
| -rw-r--r-- | 3rdparty/freetype/src/smooth/ftsmooth.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/3rdparty/freetype/src/smooth/ftsmooth.c b/3rdparty/freetype/src/smooth/ftsmooth.c new file mode 100644 index 0000000..f8d8d35 --- /dev/null +++ b/3rdparty/freetype/src/smooth/ftsmooth.c @@ -0,0 +1,535 @@ +/***************************************************************************/ +/* */ +/* ftsmooth.c */ +/* */ +/* Anti-aliasing renderer interface (body). */ +/* */ +/* Copyright 2000-2006, 2009-2013 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 = NULL; + FT_BBox cbox; + FT_Pos width, height, pitch; +#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING + FT_Pos height_org, width_org; +#endif + FT_Bitmap* bitmap = 0; + FT_Memory memory = 0; + FT_Int hmul = mode == FT_RENDER_MODE_LCD; + FT_Int vmul = mode == FT_RENDER_MODE_LCD_V; + FT_Pos x_shift, y_shift, x_left, y_top; + + FT_Raster_Params params; + + FT_Bool have_translated_origin = FALSE; + 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; + } + + outline = &slot->outline; + + /* translate the outline to the new origin if needed */ + if ( origin ) + { + FT_Outline_Translate( outline, origin->x, origin->y ); + have_translated_origin = TRUE; + } + + /* compute the control box, and grid fit it */ + FT_Outline_Get_CBox( outline, &cbox ); + + 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 ); + + if ( cbox.xMin < 0 && cbox.xMax > FT_INT_MAX + cbox.xMin ) + { + FT_ERROR(( "ft_smooth_render_generic: glyph too large:" + " xMin = %d, xMax = %d\n", + cbox.xMin >> 6, cbox.xMax >> 6 )); + error = FT_THROW( Raster_Overflow ); + goto Exit; + } + else + width = ( cbox.xMax - cbox.xMin ) >> 6; + + if ( cbox.yMin < 0 && cbox.yMax > FT_INT_MAX + cbox.yMin ) + { + FT_ERROR(( "ft_smooth_render_generic: glyph too large:" + " yMin = %d, yMax = %d\n", + cbox.yMin >> 6, cbox.yMax >> 6 )); + error = FT_THROW( Raster_Overflow ); + goto Exit; + } + else + height = ( cbox.yMax - cbox.yMin ) >> 6; + + bitmap = &slot->bitmap; + memory = render->root.memory; + +#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING + width_org = width; + height_org = height; +#endif + + /* 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 */ + pitch = width; + if ( hmul ) + { + width = width * 3; + pitch = FT_PAD_CEIL( width, 4 ); + } + + if ( vmul ) + height *= 3; + + x_shift = (FT_Int) cbox.xMin; + y_shift = (FT_Int) cbox.yMin; + x_left = (FT_Int)( cbox.xMin >> 6 ); + y_top = (FT_Int)( cbox.yMax >> 6 ); + +#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 ); + width += 3 * extra; + pitch = FT_PAD_CEIL( width, 4 ); + x_left -= extra >> 1; + } + + if ( vmul ) + { + y_shift -= 64 * ( extra >> 1 ); + height += 3 * extra; + y_top += extra >> 1; + } + } + +#endif + +#if FT_UINT_MAX > 0xFFFFU + + /* 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; + } + +#endif + + bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; + bitmap->num_grays = 256; + bitmap->width = width; + bitmap->rows = height; + bitmap->pitch = pitch; + + /* translate outline to render it into the bitmap */ + FT_Outline_Translate( outline, -x_shift, -y_shift ); + have_outline_shifted = TRUE; + + if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) + goto Exit; + else + have_buffer = TRUE; + + slot->internal->flags |= FT_GLYPH_OWN_BITMAP; + + /* 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, ¶ms ); + + /* 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, ¶ms ); + 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 */ + + /* + * 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 ) + { + error = FT_THROW( Invalid_Pixel_Size ); + goto Exit; + } + + slot->format = FT_GLYPH_FORMAT_BITMAP; + slot->bitmap_left = (FT_Int)x_left; + slot->bitmap_top = (FT_Int)y_top; + + /* 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_translated_origin ) + FT_Outline_Translate( outline, -origin->x, -origin->y ); + 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 */ |