aiie/sdl/sdl-printer.cpp

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#include "sdl-printer.h"
#define WINDOWNAME "printer"
inline void putpixel(SDL_Renderer *renderer, int x, int y, uint8_t d)
{
uint8_t v = (d ? 0xFF : 0x00);
SDL_SetRenderDrawColor(renderer, v, v, v, 255);
SDL_RenderDrawPoint(renderer, x, y);
}
SDLPrinter::SDLPrinter()
{
ypos = 0;
isDirty = false;
memset((void *)_hackyBitmap, 0, sizeof(_hackyBitmap));
window = NULL;
renderer = NULL;
}
SDLPrinter::~SDLPrinter()
{
}
void SDLPrinter::update()
{
if (isDirty) {
isDirty = false; // set early in case there's a race
if (!window) {
window = SDL_CreateWindow(WINDOWNAME,
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
WIDTH, HEIGHT,
SDL_WINDOW_SHOWN);
renderer = SDL_CreateRenderer(window, -1, 0);
}
for (int y=0; y<HEIGHT; y++) {
for (int x=0; x<WIDTH; x++) {
if (_hackyBitmap[y*WIDTH+x]) {
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
} else {
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
}
SDL_RenderDrawPoint(renderer, x, y);
}
}
SDL_RenderPresent(renderer);
}
}
void SDLPrinter::addLine(uint8_t *rowOfBits)
{
for (int yoff=0; yoff<9; yoff++) {
// 960 pixels == 120 bytes -- FIXME
for (int i=0; i<(NATIVEWIDTH/8); i++) {
uint8_t bv = rowOfBits[yoff*120+i];
for (int xoff=0; xoff<8; xoff++) {
// scale X from "actual FX80" coordinates to "real printer" coordinates
uint16_t actualX = (uint16_t)(((float)(i*8+xoff) * (float)WIDTH) / (float)NATIVEWIDTH);
uint8_t pixelColor = (bv & (1 << (7-xoff))) ? 0xFF : 0x00;
// Make sure to preserve any pixels we've already drawn b/c scaling & overstrike...
_hackyBitmap[actualX + ((ypos+yoff)%HEIGHT) * WIDTH] |= pixelColor;
}
}
}
if (ypos >= HEIGHT) {
ypos = 0;
}
isDirty = true;
}
void SDLPrinter::moveDownPixels(uint8_t p)
{
ypos+= p;
if (ypos >= HEIGHT) {
// clear page & restart
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderClear(renderer);
isDirty = true;
ypos = 0;
}
}