add vorgabe07
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churl
229
c_os/devices/LFBgraphics.cc
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229
c_os/devices/LFBgraphics.cc
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/*****************************************************************************
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* *
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* L F B G R A P H I C S *
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* *
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*---------------------------------------------------------------------------*
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* Beschreibung: Zeichenfunktionen fuer Grafikmodi, die auf einem *
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* linearen Framebuffer basieren. Verwendet in VESA und *
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* QemuVGA. *
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* *
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* Autor: Michael Schoettner, HHU, 19.9.2016 *
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* Der Code fuer das Zeichnen der Linie ist von Alan Wolfe *
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* https://blog.demofox.org/2015/01/17/bresenhams-drawing-algorithms *
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*****************************************************************************/
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#include "devices/LFBgraphics.h"
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#include "kernel/Globals.h"
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/* Hilfsfunktionen */
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void swap(unsigned int *a, unsigned int *b);
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int abs(int a);
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/*****************************************************************************
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* Methode: LFBgraphics::drawMonoBitmap *
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*---------------------------------------------------------------------------*
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* Parameter: x,y Startpunkt ab dem Text ausgegeben wird. *
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* width Breite in Pixel *
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* height Hoehe in Pixel *
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* bitmap Zeiger auf Pixel der monochromen Rastergrafik *
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* col Farbe der Pixel *
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* *
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* Beschreibung: Gibt die gegebene monochrome Rastergrafik an der Position*
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* x,y zeilenweise aus. (x,y) ist der linke obere Punkt; *
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* ist in der bitmap eine '1', so wird ein Pixel mit der *
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* Farbe col ausgegeben, ansonsten bei '0' nichts. *
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* Diese Funktion basiert auf dem Format der Fonts, welche *
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* mit cpi2fnt (AmigaOS) erzeugt wurden. Das Format erklaert*
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* sich in den C-Dateien in fonts/ von selbst. *
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*****************************************************************************/
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inline void LFBgraphics::drawMonoBitmap( unsigned int x, unsigned int y,
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unsigned int width,
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unsigned int height,
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unsigned char* bitmap,
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unsigned int color) {
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// Breite in Bytes
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unsigned short width_byte = width/8 + ((width%8 != 0) ? 1 : 0);
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for(unsigned int yoff=0; yoff<height; ++yoff) {
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int xpos=x;
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int ypos=y+yoff;
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for(unsigned int xb=0; xb < width_byte; ++xb) {
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for( int src=7; src>=0; --src) {
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if ((1 << src) & *bitmap) {
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drawPixel(xpos, ypos, color);
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}
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xpos++;
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}
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bitmap++;
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}
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}
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}
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/*****************************************************************************
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* Methode: LFBgraphics::drawString *
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*---------------------------------------------------------------------------*
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* Parameter: fnt Schrift *
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* x,y Startpunkt ab dem Text ausgegeben wird. *
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* col Farbe des Textes *
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* str Zeiger auf Zeichenkette *
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* len Laenge der Zeichenkette *
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* *
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* Beschreibung: Gibt eine Zeichenkette mit gewaehlter Schrift an der *
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* Position x,y aus. *
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*****************************************************************************/
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void LFBgraphics::drawString(Font &fnt, unsigned int x, unsigned int y,
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unsigned int col, char* str, unsigned int len) {
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unsigned int i;
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for(i = 0; i < len; ++i) {
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drawMonoBitmap(x, y, fnt.get_char_width(), fnt.get_char_height(),
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fnt.getChar( *(str+i) ), col);
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x += fnt.get_char_width();
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}
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}
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/*****************************************************************************
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* Methode: LFBgraphics::drawPixel *
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*---------------------------------------------------------------------------*
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* Parameter: x, y Koordinaten des Pixels *
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* col Farbe *
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* *
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* Beschreibung: Zeichnen eines Pixels. *
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*****************************************************************************/
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void LFBgraphics::drawPixel(unsigned int x, unsigned int y,unsigned int col) {
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unsigned char *ptr = (unsigned char *) lfb;
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if (hfb == 0 || lfb == 0) return ;
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if (mode == 0) ptr = (unsigned char *) hfb;
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// Pixel ausserhalb des sichtbaren Bereichs?
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if (x<0 || x>=xres || y<0 || y>yres)
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return;
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// Adresse des Pixels berechnen und Inhalt schreiben
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switch (bpp) {
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case 8:
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ptr += (x+y*xres);
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*ptr = col;
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return;
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case 15:
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case 16:
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ptr += (2*x+2*y*xres);
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*ptr = col;
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return;
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case 24:
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ptr += (3*x+3*y*xres);
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*ptr = (col & 0xFF); ptr++;
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*ptr = ((col>>8) & 0xFF); ptr++;
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*ptr = ((col>>16) & 0xFF); ptr++;
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return;
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case 32:
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ptr += (4*x+4*y*xres);
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*ptr = (col & 0xFF); ptr++;
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*ptr = ((col>>8) & 0xFF); ptr++;
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*ptr = ((col>>16) & 0xFF); ptr++;
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return;
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}
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}
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/*****************************************************************************
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* Methode: LFBgraphics::clear *
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*---------------------------------------------------------------------------*
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* Beschreibung: Bildschirm loeschen. *
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*****************************************************************************/
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void LFBgraphics::clear() {
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unsigned int *ptr = (unsigned int *)lfb;
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unsigned int i;
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if (hfb == 0 || lfb == 0) return ;
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if (mode == 0) ptr = (unsigned int *) hfb;
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switch (bpp) {
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case 8:
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for (i=0; i < ((xres/4)*yres); i++)
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*(ptr++) = 0;
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return;
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case 15:
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case 16:
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for (i=0; i < (2*(xres/4)*yres); i++)
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*(ptr++) = 0;
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return;
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case 24:
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for (i=0; i < (3*(xres/4)*yres); i++)
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*(ptr++) = 0;
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return;
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case 32:
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for (i=0; i < (4*(xres/4)*yres); i++)
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*(ptr++) = 0;
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return;
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}
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}
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/*****************************************************************************
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* Methode: LFBgraphics::setDrawingBuff *
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*---------------------------------------------------------------------------*
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* Beschreibung: Stellt ein, ob in den sichtbaren Puffer gezeichnet wird. *
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*****************************************************************************/
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void LFBgraphics::setDrawingBuff(int v)
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{
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mode = v;
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}
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/*****************************************************************************
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* Methode: LFBgraphics::copyHiddenToVisible *
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*---------------------------------------------------------------------------*
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* Beschreibung: Kopiert den versteckten Puffer in den sichtbaren LFB. *
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*****************************************************************************/
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void LFBgraphics::copyHiddenToVisible() {
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unsigned int *sptr = (unsigned int *)hfb;
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unsigned int *dptr = (unsigned int *)lfb;
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unsigned int i;
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if (hfb == 0 || lfb == 0) return ;
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switch (bpp) {
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case 8:
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for (i=0; i < ((xres/4)*yres); i++)
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*(dptr++) = *(sptr++);
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return;
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case 15:
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case 16:
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for (i=0; i < (2*(xres/4)*yres); i++)
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*(dptr++) = *(sptr++);
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return;
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case 24:
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for (i=0; i < (3*(xres/4)*yres); i++)
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*(dptr++) = *(sptr++);
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return;
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case 32:
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for (i=0; i < (4*(xres/4)*yres); i++)
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*(dptr++) = *(sptr++);
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return;
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}
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}
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void swap(unsigned int *a, unsigned int *b) {
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int h;
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h = *a;
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*a = *b;
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*b = h;
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}
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int abs(int a) {
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if (a<0) return -a;
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return a;
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}
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