Tweak font rendering to avoid roundoff error
Slava Pestov
parent
8bff6eba52
commit
cf587c054d
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@ -203,9 +203,7 @@ TUPLE: sprite loc dim dim2 dlist texture ;
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dup sprite-loc gl-translate
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GL_TEXTURE_2D over sprite-texture glBindTexture
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init-texture
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GL_QUADS [ dup sprite-dim2 four-sides ] do-state
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dup sprite-dim { 1 0 } v*
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swap sprite-loc v- gl-translate
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GL_QUADS [ sprite-dim2 four-sides ] do-state
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GL_TEXTURE_2D 0 glBindTexture ;
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: rect-vertices ( lower-left upper-right -- )
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@ -3,7 +3,8 @@
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USING: alien alien.accessors alien.c-types arrays io kernel libc
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math math.vectors namespaces opengl opengl.gl prettyprint assocs
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sequences io.files io.styles continuations freetype
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ui.gadgets.worlds ui.render ui.backend byte-arrays ;
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ui.gadgets.worlds ui.render ui.backend byte-arrays accessors
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locals ;
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IN: ui.freetype
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@ -41,8 +42,8 @@ M: font hashcode* drop font hashcode* ;
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] bind ;
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M: freetype-renderer free-fonts ( world -- )
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dup world-handle select-gl-context
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world-fonts [ nip second free-sprites ] assoc-each ;
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[ handle>> select-gl-context ]
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[ fonts>> [ nip second free-sprites ] assoc-each ] bi ;
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: ttf-name ( font style -- name )
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2array H{
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@ -67,7 +68,7 @@ M: freetype-renderer free-fonts ( world -- )
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#! We use FT_New_Memory_Face, not FT_New_Face, since
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#! FT_New_Face only takes an ASCII path name and causes
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#! problems on localized versions of Windows
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freetype -rot 0 f <void*> [
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[ freetype ] 2dip 0 f <void*> [
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FT_New_Memory_Face freetype-error
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] keep *void* ;
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@ -85,29 +86,29 @@ SYMBOL: dpi
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: font-units>pixels ( n font -- n )
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face-size face-size-y-scale FT_MulFix ;
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: init-ascent ( font face -- )
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dup face-y-max swap font-units>pixels swap set-font-ascent ;
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: init-ascent ( font face -- font )
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dup face-y-max swap font-units>pixels >>ascent ; inline
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: init-descent ( font face -- )
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dup face-y-min swap font-units>pixels swap set-font-descent ;
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: init-descent ( font face -- font )
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dup face-y-min swap font-units>pixels >>descent ; inline
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: init-font ( font -- )
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dup font-handle 2dup init-ascent dupd init-descent
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dup font-ascent over font-descent - ft-ceil
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swap set-font-height ;
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: init-font ( font -- font )
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dup handle>> init-ascent
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dup handle>> init-descent
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dup [ ascent>> ] [ descent>> ] bi - ft-ceil >>height ; inline
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: set-char-size ( handle size -- )
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0 swap 6 shift dpi get-global dup FT_Set_Char_Size freetype-error ;
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: <font> ( handle -- font )
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H{ } clone
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{ set-font-handle set-font-widths } font construct
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dup init-font ;
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: (open-font) ( font -- open-font )
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first3 >r open-face dup 0 r> 6 shift
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dpi get-global dpi get-global FT_Set_Char_Size
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freetype-error <font> ;
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font new
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H{ } clone >>widths
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over first2 open-face >>handle
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dup handle>> rot third set-char-size
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init-font ;
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M: freetype-renderer open-font ( font -- open-font )
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freetype drop open-fonts get [ (open-font) ] cache ;
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freetype drop open-fonts get [ <font> ] cache ;
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: load-glyph ( font char -- glyph )
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>r font-handle dup r> 0 FT_Load_Char
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@ -132,30 +133,36 @@ M: freetype-renderer string-height ( open-font string -- h )
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load-glyph dup
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FT_RENDER_MODE_NORMAL FT_Render_Glyph freetype-error ;
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: copy-pixel ( bit tex -- bit tex )
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255 f pick set-alien-unsigned-1 1+
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f pick alien-unsigned-1
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f pick set-alien-unsigned-1 >r 1+ r> 1+ ;
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:: copy-pixel ( i j bitmap texture -- i j )
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255 tex j set-alien-unsigned-1
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i bitmap alien-unsigned-1 j 1 + texture set-alien-unsigned-1
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i 1 + j 2 + ; inline
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: (copy-row) ( bit tex bitend texend -- bitend texend )
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>r pick over >= [
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2nip r>
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] [
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>r copy-pixel r> r> (copy-row)
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] if ;
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: (copy-row) ( i j bitmap texture end -- )
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i end < [
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i j bitmap texture copy-pixel
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i j bitmap texture end (copy-row)
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] when ; inline
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: copy-row ( bit tex width width2 -- bitend texend width width2 )
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[ pick + >r pick + r> (copy-row) ] 2keep ;
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: copy-row ( i j bitmap texture width width2 -- i j )
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i j bitmap texture i width + (copy-row)
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i width +
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j width2 + ; inline
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: copy-bitmap ( glyph texture -- )
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over glyph-bitmap-rows >r
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over glyph-bitmap-width dup next-power-of-2 2 *
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>r >r >r glyph-bitmap-buffer alien-address r> r> r> r>
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[ copy-row ] times 2drop 2drop ;
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:: copy-bitmap ( glyph texture -- )
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[let* | texture [ texture alien-address ]
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bitmap [ glyph glyph-bitmap-buffer alien-address ]
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rows [ glyph glyph-bitmap-rows ]
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width [ glyph glyph-bitmap-width ]
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width2 [ width next-power-of-2 2 * ] |
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0 0
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rows [ bitmap texture width width2 copy-row ] times
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2drop
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] ;
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: bitmap>texture ( glyph sprite -- id )
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tuck sprite-size2 * 2 * [
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alien-address [ copy-bitmap ] keep <alien> gray-texture
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[ copy-bitmap ] keep gray-texture
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] with-malloc ;
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: glyph-texture-loc ( glyph font -- loc )
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@ -163,34 +170,47 @@ M: freetype-renderer string-height ( open-font string -- h )
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font-ascent swap glyph-hori-bearing-y - ft-floor 2array ;
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: glyph-texture-size ( glyph -- dim )
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dup glyph-bitmap-width next-power-of-2
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swap glyph-bitmap-rows next-power-of-2 2array ;
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[ glyph-bitmap-width next-power-of-2 ]
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[ glyph-bitmap-rows next-power-of-2 ]
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bi 2array ;
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: <char-sprite> ( font char -- sprite )
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: <char-sprite> ( open-font char -- sprite )
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over >r render-glyph dup r> glyph-texture-loc
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over glyph-size pick glyph-texture-size <sprite>
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[ bitmap>texture ] keep [ init-sprite ] keep ;
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: draw-char ( open-font char sprites -- )
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[ dupd <char-sprite> ] cache nip
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sprite-dlist glCallList ;
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:: char-sprite ( open-font sprites char -- sprite )
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char sprites [ open-font swap <char-sprite> ] cache ;
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: (draw-string) ( open-font sprites string loc -- )
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: draw-char ( open-font sprites char loc -- )
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GL_MODELVIEW [
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0 0 glTranslated
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char-sprite sprite-dlist glCallList
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] do-matrix ;
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: char-widths ( open-font string -- widths )
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[ char-width ] with { } map-as ;
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: scan-sums ( seq -- seq' )
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0 [ + ] accumulate nip ;
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:: (draw-string) ( open-font sprites string loc -- )
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GL_TEXTURE_2D [
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[
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[ >r 2dup r> swap draw-char ] each 2drop
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loc [
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string open-font string char-widths scan-sums [
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[ open-font sprites ] 2dip draw-char
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] 2each
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] with-translation
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] do-enabled ;
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: font-sprites ( open-font world -- pair )
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world-fonts [ open-font H{ } clone 2array ] cache ;
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: font-sprites ( font world -- open-font sprites )
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world-fonts [ open-font H{ } clone 2array ] cache first2 ;
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M: freetype-renderer draw-string ( font string loc -- )
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>r >r world get font-sprites first2 r> r> (draw-string) ;
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>r >r world get font-sprites r> r> (draw-string) ;
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: run-char-widths ( open-font string -- widths )
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[ char-width ] with { } map-as
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dup 0 [ + ] accumulate nip swap 2 v/n v+ ;
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char-widths [ scan-sums ] [ 2 v/n ] bi v+ ;
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M: freetype-renderer x>offset ( x open-font string -- n )
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dup >r run-char-widths [ <= ] with find drop
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