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Worked on text scaling. This is an intermediate version which doesn't work.
git-svn-id: svn://svn.cc65.org/cc65/trunk@5089 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -27,16 +27,14 @@ _tgi_color: .res 1 ; Current drawing color
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_tgi_font: .res 1 ; Which font to use
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_tgi_textdir: .res 1 ; Current text direction
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_tgi_vectorfont: .res 2 ; Pointer to vector font
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; The following two store an 8.8 fixed point value in the first two bytes,
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; and a rounded integer value in the third byte. The latter is passed to the
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; driver to scale the bitmap font. The variables are expected to be in
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; this order and adjacent.
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_tgi_textscalew: .res 3 ; Text scale for the width
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_tgi_textscaleh: .res 3 ; Text scale for the height
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; The following two must also be in exactly this order
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_tgi_charwidth: .res 1 ; Char width of system font
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_tgi_charheight: .res 1 ; Char height of system font
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; The following are character scale/size variables in 8.8 fixed point
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; format. They are required to be in this order and adjacent.
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_tgi_textscalew: .res 2 ; Vector font width scale
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.res 2 ; Bitmap font width scale
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_tgi_charwidth: .res 2 ; Full width of one bitmap char
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_tgi_textscaleh: .res 2 ; Vector font height scale
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.res 2 ; Bitmap font height scale
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_tgi_charheight: .res 2 ; Full height of one bitmap char
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; End of section that gets cleared when a new driver is loaded
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csize = * - cstart
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@ -45,7 +43,7 @@ csize = * - cstart
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_tgi_xmax: .res 2
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_tgi_ymax: .res 2
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; The following variables are copied from the driver header for faster access
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; The following variables are copied from the driver header for faster access.
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; fontwidth and fontheight are expected to be in order and adjacent.
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tgi_driver_vars:
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_tgi_xres: .res 2 ; X resolution of the current mode
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@ -3,29 +3,13 @@
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;
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.include "zeropage.inc"
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.include "tgi-kernel.inc"
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.import umul8x16r24
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.import popa, popax
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;-----------------------------------------------------------------------------
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; Calculate either the total height or the total width of a bitmapped
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; character, depending on the value in Y. On entry, X contains the scaling
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; factor. Since it is usually small, we multiplicate by doing repeated adds.
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; The function returns zero in X and the calculated value in A.
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.proc charsize_helper
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lda _tgi_fontwidth,y
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jmp @L2
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@L1: clc
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adc _tgi_fontwidth,y
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@L2: dex
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bne @L1
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sta _tgi_charwidth,y
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rts
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.endproc
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.macpack cpu
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;-----------------------------------------------------------------------------
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; void __fastcall__ tgi_textstyle (unsigned width, unsigned height,
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@ -57,43 +41,65 @@
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.proc _tgi_textscale
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; The height value is in 8.8 fixed point. Store it and calculate a rounded
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; value for scaling the bitmapped system font in the driver.
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; Setup the height
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sta _tgi_textscaleh+0
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stx _tgi_textscaleh+1
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asl a ; Check value behind comma
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ldy _tgi_fontheight ; Get height of bitmap font in pixels
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sty ptr1 ; Save for later
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ldy #6 ; Address the height
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jsr process_onedim ; Process height
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; Setup the width
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jsr popax ; Get width scale into a/x
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ldy _tgi_fontwidth ; Get width of bitmap font in pixels
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sty ptr1 ; Save for later
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ldy #0 ; Address the width
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; Process one character dimension. That means:
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;
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; - Store the vector font dimension in 8.8 format
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; - If necessary, round up/down to next integer
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; - Store the bitmap font dimension in 8.8 format
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; - Multiply by size of bitmap char in pixels
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; - Store the bitmap font size in 8.8 format
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;
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process_onedim:
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jsr store ; Store vector font scale factor
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bit _tgi_flags ; Fine grained scaling support avail?
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bmi @L2 ; Jump if yes
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asl a ; Round to nearest full integer
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bcc @L1
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inx ; Round
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@L1: stx _tgi_textscaleh+2 ; Store rounded value
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inx
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@L1: lda #0
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; Calculate the total height of the bitmapped font and remember it.
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@L2: jsr store ; Store bitmap font scale factor
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ldy #1
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jsr charsize_helper
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; The size of the font in pixels in the selected dimension is already in ptr1
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; So if we call umul8x16r24 we get the size in pixels in 16.8 fixed point.
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; Disallowing characters larger than 256 pixels, we just drop the high byte
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; and remember the low 16 bit as size in 8.8 format.
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; The width value is in 8.8 fixed point. Store it and calculate a rounded
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; value for scaling the bitmapped system font in the driver.
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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phy ; Save Y
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jsr umul8x16r24
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ply ; Restore Y
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.else
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sty tmp1 ; Save Y
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jsr umul8x16r24
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ldy tmp1 ; Restore Y
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.endif
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jsr popax ; height
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sta _tgi_textscalew+0
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stx _tgi_textscalew+1
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asl a ; Check value behind comma
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bcc @L2
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inx ; Round
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@L2: stx _tgi_textscalew+2 ; Store rounded value
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; Calculate the total width of the bitmapped font and remember it.
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ldy #0
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jsr charsize_helper
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; Load values and call the driver, parameters are passed in registers
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ldx _tgi_textscalew+2
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ldy _tgi_textscaleh+2
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lda _tgi_textdir
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jmp tgi_textstyle
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store: sta _tgi_textscalew,y
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iny
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pha
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txa
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sta _tgi_textscalew,y
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iny
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pla
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rts
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.endproc
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