ref: d8054e60750f79b7a5b6d8ce73321823ad5de640
dir: /textscreen/txt_main.h/
// // Copyright(C) 2005-2014 Simon Howard // // 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; either version 2 // of the License, or (at your option) any later version. // // This program 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 General Public License for more details. // // // Base interface that abstracts the text mode screen. // #ifndef TXT_MAIN_H #define TXT_MAIN_H // For the moment, txt_sdl.c is the only implementation of the base // text mode screen API: #include "txt_sdl.h" // textscreen key values: // Key values are difficult because we have to support multiple conflicting // address spaces. // First, Doom's key constants use 0-127 as ASCII and extra values from // 128-255 to represent special keys. Second, mouse buttons are represented // as buttons. Finally, we want to be able to support Unicode. // // So we define different ranges: // 0-255: Doom key constants, including ASCII. // 256-511: Mouse buttons and other reserved. // >=512: Unicode values greater than 127 are offset up into this range. // Special keypress values that correspond to mouse button clicks #define TXT_MOUSE_BASE 256 #define TXT_MOUSE_LEFT (TXT_MOUSE_BASE + 0) #define TXT_MOUSE_RIGHT (TXT_MOUSE_BASE + 1) #define TXT_MOUSE_MIDDLE (TXT_MOUSE_BASE + 2) #define TXT_MOUSE_SCROLLUP (TXT_MOUSE_BASE + 3) #define TXT_MOUSE_SCROLLDOWN (TXT_MOUSE_BASE + 4) #define TXT_MAX_MOUSE_BUTTONS 16 #define TXT_KEY_TO_MOUSE_BUTTON(x) \ ( (x) >= TXT_MOUSE_BASE \ && (x) < TXT_MOUSE_BASE + TXT_MAX_MOUSE_BUTTONS ? \ (x) - TXT_MOUSE_BASE : -1 ) // Unicode offset. Unicode values from 128 onwards are offset up into // this range, so TXT_UNICODE_BASE = Unicode character #128, and so on. #define TXT_UNICODE_BASE 512 // Convert a key value to a Unicode character: #define TXT_KEY_TO_UNICODE(x) \ ( (x) < 128 ? (x) : \ (x) >= TXT_UNICODE_BASE ? ((x) - TXT_UNICODE_BASE + 128) : 0 ) // Convert a Unicode character to a key value: #define TXT_UNICODE_TO_KEY(u) \ ( (u) < 128 ? (u) : ((u) - 128 + TXT_UNICODE_BASE) ) // Screen size #define TXT_SCREEN_W 80 #define TXT_SCREEN_H 25 #define TXT_COLOR_BLINKING (1 << 3) typedef enum { TXT_COLOR_BLACK, TXT_COLOR_BLUE, TXT_COLOR_GREEN, TXT_COLOR_CYAN, TXT_COLOR_RED, TXT_COLOR_MAGENTA, TXT_COLOR_BROWN, TXT_COLOR_GREY, TXT_COLOR_DARK_GREY, TXT_COLOR_BRIGHT_BLUE, TXT_COLOR_BRIGHT_GREEN, TXT_COLOR_BRIGHT_CYAN, TXT_COLOR_BRIGHT_RED, TXT_COLOR_BRIGHT_MAGENTA, TXT_COLOR_YELLOW, TXT_COLOR_BRIGHT_WHITE, } txt_color_t; // Modifier keys. typedef enum { TXT_MOD_SHIFT, TXT_MOD_CTRL, TXT_MOD_ALT, TXT_NUM_MODIFIERS } txt_modifier_t; // Due to the way the SDL API works, we provide different ways of configuring // how we read input events, each of which is useful in different scenarios. typedef enum { // "Localized" output that takes software keyboard layout into account, // but key shifting has no effect. TXT_INPUT_NORMAL, // "Raw" input; the keys correspond to physical keyboard layout and // software keyboard layout has no effect. TXT_INPUT_RAW, // Used for full text input. Events are fully shifted and localized. // However, not all keyboard keys will generate input. // Setting this mode may activate the on-screen keyboard, depending on // device and OS. TXT_INPUT_TEXT, } txt_input_mode_t; // Initialize the screen // Returns 1 if successful, 0 if failed. int TXT_Init(void); // Shut down text mode emulation void TXT_Shutdown(void); // Get a pointer to the buffer containing the raw screen data. unsigned char *TXT_GetScreenData(void); // Update an area of the screen void TXT_UpdateScreenArea(int x, int y, int w, int h); // Update the whole screen void TXT_UpdateScreen(void); // Read a character from the keyboard int TXT_GetChar(void); // Given a Unicode character, get a character that can be used to represent // it on the code page being displayed on the screen. If the character cannot // be represented, this returns -1. int TXT_UnicodeCharacter(unsigned int c); // Read the current state of modifier keys that are held down. int TXT_GetModifierState(txt_modifier_t mod); // Provides a short description of a key code, placing into the provided // buffer. Note that the key is assumed to represent a physical key on the // keyboard (like that returned by TXT_INPUT_RAW), and the resulting string // takes keyboard layout into consideration. For example, // TXT_GetKeyDescription('q') on a French keyboard returns "A". // The contents of the filled buffer will be in UTF-8 format, but will never // contain characters which can't be shown on the screen. void TXT_GetKeyDescription(int key, char *buf, size_t buf_len); // Retrieve the current position of the mouse void TXT_GetMousePosition(int *x, int *y); // Sleep until an event is received or the screen needs updating // Optional timeout in ms (timeout == 0 : sleep forever) void TXT_Sleep(int timeout); // Change mode for text input. void TXT_SetInputMode(txt_input_mode_t mode); // Set the window title of the window containing the text mode screen void TXT_SetWindowTitle(char *title); // Safe string copy. void TXT_StringCopy(char *dest, const char *src, size_t dest_len); // Safe string concatenate. void TXT_StringConcat(char *dest, const char *src, size_t dest_len); // Safe version of vsnprintf(). int TXT_vsnprintf(char *buf, size_t buf_len, const char *s, va_list args); // Safe version of snprintf(). int TXT_snprintf(char *buf, size_t buf_len, const char *s, ...); #endif /* #ifndef TXT_MAIN_H */