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Diffstat (limited to 'contrib/syslinux-4.02/core/graphics.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/graphics.inc | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/graphics.inc b/contrib/syslinux-4.02/core/graphics.inc new file mode 100644 index 0000000..a8d2851 --- /dev/null +++ b/contrib/syslinux-4.02/core/graphics.inc @@ -0,0 +1,353 @@ +;; ----------------------------------------------------------------------- +;; +;; Copyright 1994-2008 H. Peter Anvin - All Rights Reserved +;; +;; This program is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, +;; Boston MA 02111-1307, USA; either version 2 of the License, or +;; (at your option) any later version; incorporated herein by reference. +;; +;; ----------------------------------------------------------------------- + +; ---------------------------------------------------------------------------- +; VGA splash screen code +; ---------------------------------------------------------------------------- + +; +; vgadisplayfile: +; Display a graphical splash screen. +; The file is already opened on the top of the getc stack. +; +; Assumes CS == DS == ES. +; + section .text16 + +vgadisplayfile: + ; This is a cheap and easy way to make sure the screen is + ; cleared in case we were in graphics mode already + call vgaclearmode + call vgasetmode + jnz .error_nz + +.graphalready: + ; Load the header. + mov cx,4+2*2+16*3 + mov di,LSSHeader +.gethdr: + call getc + stosb + loop .gethdr + jc .error + + ; The header WILL be in the first chunk. + cmp dword [LSSMagic],0x1413f33d ; Magic number +.error_nz: jne .error + + mov dx,GraphColorMap ; Color map offset + mov ax,1012h ; Set RGB registers + xor bx,bx ; First register number + mov cx,16 ; 16 registers + int 10h + +.movecursor: + mov ax,[GraphYSize] ; Number of pixel rows + mov dx,[VGAFontSize] + add ax,dx + dec ax + div dl + xor dx,dx ; Set column to 0 + cmp al,[VidRows] + jb .rowsok + mov al,[VidRows] + dec al +.rowsok: + mov dh,al + mov ah,2 + xor bx,bx + int 10h ; Set cursor below image + + mov cx,[GraphYSize] ; Number of graphics rows + mov word [VGAPos],0 + +.drawpixelrow: + push cx + mov di,VGARowBuffer + ; Pre-clear the row buffer + push di + push di + mov cx,640/4 + xor eax,eax + rep stosd + pop di + mov cx,[GraphXSize] + call rledecode ; Decode one row + pop si + mov di,VGAPlaneBuffer + push di + mov bp,640 + call packedpixel2vga + pop si + push es + mov di,0A000h ; VGA segment + mov es,di + mov di,[VGAPos] + call outputvga + pop es + add word [VGAPos],640/8 + pop cx + loop .drawpixelrow + +.error: + jmp close ; Tailcall! + +; +; rledecode: +; Decode a pixel row in RLE16 format. +; +; getc stack -> input +; CX -> pixel count +; ES:DI -> output (packed pixel) +; +rledecode: + xor dx,dx ; DL = last pixel, DH = nybble buffer +.loop: + call .getnybble + cmp al,dl + je .run ; Start of run sequence + stosb + mov dl,al + dec cx + jnz .loop +.done: + ret +.run: + xor bx,bx + call .getnybble + or bl,al + jz .longrun +.dorun: + push cx + mov cx,bx + mov al,dl + rep stosb + pop cx + sub cx,bx + ja .loop + jmp short .done +.longrun: + call .getnybble + mov bl,al + call .getnybble + shl al,4 + or bl,al + add bx,16 + jmp short .dorun + +.getnybble: + test dh,10h + jz .low + and dh,0Fh + mov al,dh + ret +.low: + call getc + mov dh,al + shr dh,4 + or dh,10h ; Nybble already read + and al,0Fh + ret + +; +; packedpixel2vga: +; Convert packed-pixel to VGA bitplanes +; +; DS:SI -> packed pixel string +; BP -> pixel count (multiple of 8) +; DS:DI -> output (four planes) +; +packedpixel2vga: + xor cx,cx +.planeloop: + inc cx + push si + push bp +.loop1: + mov bx,8 +.loop2: + lodsb + shr al,cl + rcl dl,1 ; VGA is bigendian. Sigh. + dec bx + jnz .loop2 + mov [di],dl + inc di + sub bp,byte 8 + ja .loop1 + pop bp + pop si + cmp cl,3 + jbe .planeloop + ret + +; +; outputvga: +; Output four subsequent lines of VGA data +; +; DS:SI -> four planes @ 640/8=80 bytes +; ES:DI -> pointer into VGA memory +; +outputvga: + mov dx,3C4h ; VGA Sequencer Register select port + mov al,2 ; Sequencer mask + out dx,al ; Select the sequencer mask + inc dx ; VGA Sequencer Register data port + dec ax ; AL <- 1 +.loop1: + out dx,al ; Select the bit plane to write + push di + mov cx,640/32 + rep movsd + pop di + add ax,ax + cmp al,8 + jbe .loop1 + ret + +; +; vgasetmode: +; Enable VGA graphics, if possible; return ZF=1 on success +; DS must be set to the base segment; ES is set to DS. +; +vgasetmode: + push ds + pop es + mov al,[UsingVGA] + cmp al,01h + je .success ; Nothing to do... + test al,04h + jz .notvesa + ; We're in a VESA mode, which means VGA; use VESA call + ; to revert the mode, and then call the conventional + ; mode-setting for good measure... + mov ax,4F02h + mov bx,0012h + int 10h + jmp .setmode +.notvesa: + mov ax,1A00h ; Get video card and monitor + xor bx,bx + int 10h + sub bl, 7 ; BL=07h and BL=08h OK + cmp bl, 1 + ja .error ; ZF=0 +; mov bx,TextColorReg +; mov dx,1009h ; Read color registers +; int 10h +.setmode: + mov ax,0012h ; Set mode = 640x480 VGA 16 colors + int 10h + mov dx,linear_color + mov ax,1002h ; Write color registers + int 10h + mov [UsingVGA], byte 1 + + ; Set GXPixCols and GXPixRows + mov dword [GXPixCols],640+(480 << 16) + + call use_font ; Set graphics font/data + mov byte [ScrollAttribute], 00h + +.success: + xor ax,ax ; Set ZF +.error: + ret + +; +; vgaclearmode: +; Disable VGA graphics. It is not safe to assume any value +; for DS or ES. +; +vgaclearmode: + push ds + push es + pushad + mov ax,cs + mov ds,ax + mov es,ax + mov al,[UsingVGA] + and al,al ; Already in text mode? + jz .done + test al,04h + jz .notvesa + mov ax,4F02h ; VESA return to normal video mode + mov bx,0003h + int 10h +.notvesa: + mov ax,0003h ; Return to normal video mode + int 10h +; mov dx,TextColorReg ; Restore color registers +; mov ax,1002h +; int 10h + mov [UsingVGA], byte 0 + + mov byte [ScrollAttribute], 07h + call use_font ; Restore text font/data +.done: + popad + pop es + pop ds + ret + +; +; vgashowcursor/vgahidecursor: +; If VGA graphics is enabled, draw a cursor/clear a cursor +; +vgashowcursor: + pushad + mov al,'_' + jmp short vgacursorcommon +vgahidecursor: + pushad + mov al,' ' +vgacursorcommon: + cmp [UsingVGA], byte 1 + jne .done + mov ah,09h + mov bx,0007h + mov cx,1 + int 10h +.done: + popad + ret + + + section .data16 + ; Map colors to consecutive DAC registers +linear_color db 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0 + + ; See comboot.doc, INT 22h AX=0017h for the semantics + ; of this byte. +UsingVGA db 0 + + section .bss16 + alignb 4 +LSSHeader equ $ +LSSMagic resd 1 ; Magic number +GraphXSize resw 1 ; Width of splash screen file +GraphYSize resw 1 ; Height of splash screen file +GraphColorMap resb 3*16 +VGAPos resw 1 ; Pointer into VGA memory +VGAFilePtr resw 1 ; Pointer into VGAFileBuf +; TextColorReg resb 17 ; VGA color registers for text mode +%if IS_SYSLINUX +VGAFileBuf resb FILENAME_MAX+2 ; Unmangled VGA image name +%else +VGAFileBuf resb FILENAME_MAX ; Unmangled VGA image name +%endif +VGAFileBufEnd equ $ +VGAFileMBuf resb FILENAME_MAX ; Mangled VGA image name + + alignb 4 +VGARowBuffer resb 640+80 ; Decompression buffer +VGAPlaneBuffer resb (640/8)*4 ; Plane buffers |