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trezor-firmware/emulator/oled.c
Yura Pakhuchiy 3a3bea1401 Emulator: allow software renderer
Makes emulator usable in containers
2018-03-30 13:59:45 +02:00

122 lines
2.9 KiB
C

/*
* This file is part of the TREZOR project, https://trezor.io/
*
* Copyright (C) 2017 Saleem Rashid <trezor@saleemrashid.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "oled.h"
#if HEADLESS
void oledInit(void) {}
void oledRefresh(void) {}
void emulatorPoll(void) {}
#else
#include <SDL.h>
static SDL_Renderer *renderer = NULL;
static SDL_Texture *texture = NULL;
#define ENV_OLED_SCALE "TREZOR_OLED_SCALE"
static int emulatorScale(void) {
const char *variable = getenv(ENV_OLED_SCALE);
if (!variable) {
return 1;
}
int scale = atoi(variable);
if (scale >= 1 && scale <= 16) {
return scale;
}
return 1;
}
void oledInit(void) {
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
fprintf(stderr, "Failed to initialize SDL: %s\n", SDL_GetError());
exit(1);
}
atexit(SDL_Quit);
int scale = emulatorScale();
SDL_Window *window = SDL_CreateWindow("TREZOR",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
OLED_WIDTH * scale,
OLED_HEIGHT * scale,
0);
if (window == NULL) {
fprintf(stderr, "Failed to create window: %s\n", SDL_GetError());
exit(1);
}
renderer = SDL_CreateRenderer(window, -1, 0);
if (!renderer) {
fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError());
exit(1);
}
/* Use unscaled coordinate system */
SDL_RenderSetLogicalSize(renderer, OLED_WIDTH, OLED_HEIGHT);
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, OLED_WIDTH, OLED_HEIGHT);
oledClear();
oledRefresh();
}
void oledRefresh(void) {
/* Draw triangle in upper right corner */
oledInvertDebugLink();
const uint8_t *buffer = oledGetBuffer();
static uint32_t data[OLED_HEIGHT][OLED_WIDTH];
for (size_t i = 0; i < OLED_BUFSIZE; i++) {
int x = (OLED_BUFSIZE - 1 - i) % OLED_WIDTH;
int y = (OLED_BUFSIZE - 1 - i) / OLED_WIDTH * 8 + 7;
for (uint8_t shift = 0; shift < 8; shift++, y--) {
bool set = (buffer[i] >> shift) & 1;
data[y][x] = set ? 0xFFFFFFFF : 0xFF000000;
}
}
SDL_UpdateTexture(texture, NULL, data, OLED_WIDTH * sizeof(uint32_t));
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
/* Return it back */
oledInvertDebugLink();
}
void emulatorPoll(void) {
SDL_Event event;
if (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
exit(1);
}
}
}
#endif