Revision 3553234c34a0ae55dc855d44ec2635c805c2b3de authored by alex@thinkpad on 05 September 2016, 19:48:15 UTC, committed by alex@thinkpad on 05 September 2016, 19:48:15 UTC
1 parent 1b76e90
lua_display.c
/***
Display and bmp drawing functions
@author Magic Lantern Team
@copyright 2014
@license GPL
@module display
*/
#include <dryos.h>
#include <string.h>
#include <bmp.h>
#include <zebra.h>
#include <screenshot.h>
#include <notify_box.h>
#include <powersave.h>
#include "lua_common.h"
/***
Turn the display on
@function on
*/
static int luaCB_display_on(lua_State * L)
{
display_on();
return 0;
}
/***
Turn the display off
@function off
*/
static int luaCB_display_off(lua_State * L)
{
display_off();
return 0;
}
/***
Take a screenshot
@tparam[opt] string filename
@tparam[opt] int mode
@function screenshot
*/
static int luaCB_display_screenshot(lua_State * L)
{
LUA_PARAM_STRING_OPTIONAL(filename, 1, SCREENSHOT_FILENAME_AUTO);
LUA_PARAM_INT_OPTIONAL(mode, 2, SCREENSHOT_BMP | SCREENSHOT_YUV);
take_screenshot((char*)filename, mode);
return 0;
}
/***
Clear the screen
@function clear
*/
static int luaCB_display_clear(lua_State * L)
{
clrscr();
return 0;
}
/***
Print text to the screen.
@tparam string text
@tparam int x
@tparam int y
@tparam[opt] font font @{constants.FONT}
@tparam[opt] int fg foreground @{constants.COLOR}
@tparam[opt] int bg background @{constants.COLOR}
@tparam[opt] int max_width
@treturn string any remaining characters that wouldn't fit on the screen
@function print
*/
static int luaCB_display_print(lua_State * L)
{
LUA_PARAM_STRING(str, 1);
LUA_PARAM_INT(x, 2);
LUA_PARAM_INT(y, 3);
uint32_t font = FONT_MED;
if(lua_istable(L, 4))
{
if(lua_getfield(L, 4, "_spec") == LUA_TNUMBER)
{
font = lua_tointeger(L, -1);
}
lua_pop(L,1);
}
LUA_PARAM_INT_OPTIONAL(fg, 5, COLOR_WHITE);
LUA_PARAM_INT_OPTIONAL(bg, 6, COLOR_BLACK);
LUA_PARAM_INT_OPTIONAL(max_width, 7, 720 - x);
int actual_width = bmp_string_width(font, str);
uint32_t max_chars = (uint32_t)bmp_strlen_clipped(font, str, max_width);
if(actual_width > max_width && max_chars < strlen(str))
{
lua_pushstring(L, str + max_chars);
char * temp = malloc(sizeof(char) * max_chars + 1);
strncpy(temp,str,max_chars);
temp[max_chars] = 0;
bmp_printf(FONT(font, fg, bg), x, y, "%s", temp);
free(temp);
return 1;
}
else
{
bmp_printf(FONT(font, fg, bg), x, y, "%s", str);
return 0;
}
}
/***
Set a pixel to a color
(omit color param to read the current color)
@tparam int x
@tparam int y
@tparam[opt] int color @{constants.COLOR}
@return color @{constants.COLOR}
@function pixel
*/
static int luaCB_display_pixel(lua_State * L)
{
LUA_PARAM_INT(x, 1);
LUA_PARAM_INT(y, 2);
LUA_PARAM_INT_OPTIONAL(color, 3, -1);
if(color == -1)
{
lua_pushinteger(L, bmp_getpixel(x, y));
}
else
{
bmp_putpixel(x, y, (uint8_t)color);
lua_pushinteger(L, color);
}
return 1;
}
/***
Draw a line
@tparam int x1
@tparam int y1
@tparam int x2
@tparam int y2
@tparam int color @{constants.COLOR}
@function line
*/
static int luaCB_display_line(lua_State * L)
{
LUA_PARAM_INT(x1, 1);
LUA_PARAM_INT(y1, 2);
LUA_PARAM_INT(x2, 3);
LUA_PARAM_INT(y2, 4);
LUA_PARAM_INT(color, 5);
draw_line(x1, y1, x2, y2, (uint8_t)color);
return 0;
}
/***
Draw a rect
@tparam int x
@tparam int y
@tparam int w
@tparam int h
@tparam int stroke outline @{constants.COLOR}
@tparam[opt] int fill fill @{constants.COLOR}
@function rect
*/
static int luaCB_display_rect(lua_State * L)
{
LUA_PARAM_INT(x, 1);
LUA_PARAM_INT(y, 2);
LUA_PARAM_INT(w, 3);
LUA_PARAM_INT(h, 4);
LUA_PARAM_INT(stroke, 5);
LUA_PARAM_INT_OPTIONAL(fill, 6, -1);
if(fill >= 0) bmp_fill((uint8_t)fill, x, y, w, h);
if(stroke >= 0) bmp_draw_rect((uint8_t)stroke, x, y, w, h);
return 0;
}
/***
Draw a circle
@tparam int x center x
@tparam int y center y
@tparam int r radius
@tparam int stroke outline @{constants.COLOR}
@tparam[opt] int fill fill @{constants.COLOR}
@function circle
*/
static int luaCB_display_circle(lua_State * L)
{
LUA_PARAM_INT(x, 1);
LUA_PARAM_INT(y, 2);
LUA_PARAM_INT(r, 3);
LUA_PARAM_INT(stroke, 4);
LUA_PARAM_INT_OPTIONAL(fill, 5, -1);
if(fill >= 0) fill_circle(x, y, r, (uint8_t)fill);
if(stroke >= 0) draw_circle(x, y, r, (uint8_t)stroke);
return 0;
}
static int luaCB_bitmap_index(lua_State * L);
static int luaCB_bitmap_newindex(lua_State * L);
/***
Loads a bitmap file so it can be drawn on the screen
@tparam string filename
@treturn bitmap
@function load
*/
static int luaCB_display_load(lua_State * L)
{
LUA_PARAM_STRING(filename, 1);
struct bmp_file_t * bmp_file = bmp_load(filename, 1);
if(!bmp_file) return luaL_error(L, "Error loading bitmap file");
lua_newtable(L);
lua_pushlightuserdata(L, bmp_file);
lua_setfield(L, -2, "_ptr");
lua_pushcfunction(L, luaCB_bitmap_index);
lua_setfield(L, -2, "__index");
lua_pushcfunction(L, luaCB_bitmap_newindex);
lua_setfield(L, -2, "__newindex");
lua_pushvalue(L, -1);
lua_setmetatable(L, -2);
return 1;
}
/***
Runs the given function and double-buffers all the drawing done by the function
Then copies the buffer back to the actual screen buffer when the function returns
Use this to avoid flickering when drawing
@tparam func draw_func
@function draw
*/
static int luaCB_display_draw(lua_State *L)
{
if(!lua_isfunction(L, 1)) return luaL_argerror(L, 1, "expected function");
//if not __display_draw_running
lua_getglobal(L, "__display_draw_running");
if(lua_isboolean(L, -1) && lua_toboolean(L, -1))
{
//we're already running inside a display.draw call, so just run the function
lua_pushvalue(L, 1);
lua_call(L,0,0);
}
else
{
//__display_draw_running = true
lua_pushboolean(L, 1);lua_setglobal(L, "__display_draw_running");
int status = 0;
BMP_LOCK
(
bmp_idle_copy(0,0);
bmp_draw_to_idle(1);
lua_pushvalue(L, 1);
status = docall(L, 0, 0);
bmp_draw_to_idle(0);
bmp_idle_copy(1,0);
)
//__display_draw_running = false
lua_pushboolean(L, 0);lua_setglobal(L, "__display_draw_running");
//re-throw the error
if(status != LUA_OK) lua_error(L);
}
return 0;
}
/***
Prints a message on the screen for a period of time
@tparam string text
@tparam[opt=1000] int timeout in ms
@function notify_box
*/
static int luaCB_display_notify_box(lua_State * L)
{
LUA_PARAM_STRING(text, 1);
LUA_PARAM_INT_OPTIONAL(timeout, 2, 1000);
NotifyBox(timeout, "%s", text);
return 0;
}
static int luaCB_display_index(lua_State * L)
{
LUA_PARAM_STRING_OPTIONAL(key, 2, "");
if(!strcmp(key, "idle")) lua_pushboolean(L, display_idle());
/// The width of the display (720)
//@tfield int width
else if(!strcmp(key, "width")) lua_pushinteger(L, 720);
/// The height of the display (480)
//@tfield int height
else if(!strcmp(key, "height")) lua_pushinteger(L, 480);
else lua_rawget(L, 1);
return 1;
}
static int luaCB_display_newindex(lua_State * L)
{
LUA_PARAM_STRING_OPTIONAL(key, 2, "");
if(!strcmp(key, "idle") || !strcmp(key, "height") || !strcmp(key, "width"))
{
return luaL_error(L, "'%s' is readonly!", key);
}
else
{
lua_rawset(L, 1);
}
return 0;
}
/// Represents a bitmap file that has been loaded
// @type bitmap
/***
Draws this bitmap image to the screen
@tparam int x
@tparam int y
@tparam[opt] int w
@tparam[opt] int h
@function draw
*/
static int luaCB_bitmap_draw(lua_State * L)
{
if(!lua_istable(L, 1)) return luaL_argerror(L, 1, "expected table");
if(lua_getfield(L, 1, "_ptr") == LUA_TLIGHTUSERDATA)
{
struct bmp_file_t * bmp_file = lua_touserdata(L, -1);
LUA_PARAM_INT(x, 2);
LUA_PARAM_INT(y, 3);
LUA_PARAM_INT_OPTIONAL(w, 4, (int)bmp_file->width);
LUA_PARAM_INT_OPTIONAL(h, 5, (int)bmp_file->height);
bmp_draw_scaled_ex(bmp_file, x, y, w, h, 0);
}
else
{
return luaL_error(L, "Invalid pointer to bitmap file");
}
return 0;
}
static int luaCB_bitmap_index(lua_State * L)
{
if(!lua_istable(L, 1)) return luaL_argerror(L, 1, "expected table");
LUA_PARAM_STRING_OPTIONAL(key, 2, "");
if(lua_getfield(L, 1, "_ptr") == LUA_TLIGHTUSERDATA)
{
struct bmp_file_t * bmp_file = lua_touserdata(L, -1);
/// Get the bits per pixel
// @tfield int bits_per_pixel
if(!strcmp(key, "bits_per_pixel")) lua_pushinteger(L, bmp_file->bits_per_pixel);
/// Get the image width
// @tfield int width
else if(!strcmp(key, "width")) lua_pushinteger(L, bmp_file->width);
/// Get the image height
// @tfield int height
else if(!strcmp(key, "height")) lua_pushinteger(L, bmp_file->height);
/// Get the number of colors
// @tfield int num_colors
else if(!strcmp(key, "num_colors")) lua_pushinteger(L, bmp_file->num_colors);
/// Get the image size
// @tfield int size
else if(!strcmp(key, "size")) lua_pushinteger(L, bmp_file->size);
/// Get the image signature
// @tfield int signature
else if(!strcmp(key, "signature")) lua_pushinteger(L, bmp_file->signature);
/// Get the image horizontal resolution
// @tfield int hpix_per_meter
else if(!strcmp(key, "hpix_per_meter")) lua_pushinteger(L, bmp_file->hpix_per_meter);
/// Get the image vertical resolution
// @tfield int vpix_per_meter
else if(!strcmp(key, "vpix_per_meter")) lua_pushinteger(L, bmp_file->vpix_per_meter);
else if(!strcmp(key, "draw")) lua_pushcfunction(L, luaCB_bitmap_draw);
else return lua_rawget(L, 1);
}
else
{
return luaL_error(L, "could not get lightuserdata for card");
}
return 1;
}
static int luaCB_bitmap_newindex(lua_State * L)
{
return luaL_error(L, "'bitmap' type is readonly");
}
static const char * lua_display_fields[] =
{
"idle",
"height",
"width",
NULL
};
const luaL_Reg displaylib[] =
{
{"on", luaCB_display_on},
{"off", luaCB_display_off},
{"screenshot", luaCB_display_screenshot},
{"clear", luaCB_display_clear},
{"print", luaCB_display_print},
{"pixel", luaCB_display_pixel},
{"line", luaCB_display_line},
{"rect", luaCB_display_rect},
{"circle", luaCB_display_circle},
{"load", luaCB_display_load},
{"draw", luaCB_display_draw},
{"notify_box", luaCB_display_notify_box},
{NULL, NULL}
};
LUA_LIB(display);
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