ref: 9524b0fabe99516b6bc45bd8b40223235921a6c7
dir: /textscreen/txt_gui.c/
//
// 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.
//
#include <stdlib.h>
#include <string.h>
#include "txt_gui.h"
#include "txt_io.h"
#include "txt_main.h"
#include "txt_utf8.h"
typedef struct txt_cliparea_s txt_cliparea_t;
// Mapping table that converts from the Extended ASCII codes in the
// CP437 codepage to Unicode character numbers.
static const uint16_t cp437_unicode[] = {
0x00c7, 0x00fc, 0x00e9, 0x00e2, // 80-8f
0x00e4, 0x00e0, 0x00e5, 0x00e7,
0x00ea, 0x00eb, 0x00e8, 0x00ef,
0x00ee, 0x00ec, 0x00c4, 0x00c5,
0x00c9, 0x00e6, 0x00c6, 0x00f4, // 90-9f
0x00f6, 0x00f2, 0x00fb, 0x00f9,
0x00ff, 0x00d6, 0x00dc, 0x00a2,
0x00a3, 0x00a5, 0x20a7, 0x0192,
0x00e1, 0x00ed, 0x00f3, 0x00fa, // a0-af
0x00f1, 0x00d1, 0x00aa, 0x00ba,
0x00bf, 0x2310, 0x00ac, 0x00bd,
0x00bc, 0x00a1, 0x00ab, 0x00bb,
0x2591, 0x2592, 0x2593, 0x2502, // b0-bf
0x2524, 0x2561, 0x2562, 0x2556,
0x2555, 0x2563, 0x2551, 0x2557,
0x255D, 0x255C, 0x255B, 0x2510,
0x2514, 0x2534, 0x252C, 0x251C, // c0-cf
0x2500, 0x253C, 0x255E, 0x255F,
0x255A, 0x2554, 0x2569, 0x2566,
0x2560, 0x2550, 0x256C, 0x2567,
0x2568, 0x2564, 0x2565, 0x2559, // d0-df
0x2558, 0x2552, 0x2553, 0x256B,
0x256A, 0x2518, 0x250C, 0x2588,
0x2584, 0x258C, 0x2590, 0x2580,
0x03B1, 0x00DF, 0x0393, 0x03C0, // e0-ef
0x03A3, 0x03C3, 0x00B5, 0x03C4,
0x03A6, 0x0398, 0x03A9, 0x03B4,
0x221E, 0x03C6, 0x03B5, 0x2229,
0x2261, 0x00B1, 0x2265, 0x2264, // f0-ff
0x2320, 0x2321, 0x00F7, 0x2248,
0x00B0, 0x2219, 0x00B7, 0x221A,
0x207F, 0x00B2, 0x25A0, 0x00A0,
};
struct txt_cliparea_s
{
int x1, x2;
int y1, y2;
txt_cliparea_t *next;
};
// Array of border characters for drawing windows. The array looks like this:
//
// +-++
// | ||
// +-++
// +-++
static const int borders[4][4] =
{
{0xda, 0xc4, 0xc2, 0xbf},
{0xb3, ' ', 0xb3, 0xb3},
{0xc3, 0xc4, 0xc5, 0xb4},
{0xc0, 0xc4, 0xc1, 0xd9},
};
static txt_cliparea_t *cliparea = NULL;
#define VALID_X(x) ((x) >= cliparea->x1 && (x) < cliparea->x2)
#define VALID_Y(y) ((y) >= cliparea->y1 && (y) < cliparea->y2)
void TXT_DrawDesktopBackground(const char *title)
{
int i;
unsigned char *screendata;
unsigned char *p;
screendata = TXT_GetScreenData();
// Fill the screen with gradient characters
p = screendata;
for (i=0; i<TXT_SCREEN_W * TXT_SCREEN_H; ++i)
{
*p++ = 0xb1;
*p++ = TXT_COLOR_GREY | (TXT_COLOR_BLUE << 4);
}
// Draw the top and bottom banners
p = screendata;
for (i=0; i<TXT_SCREEN_W; ++i)
{
*p++ = ' ';
*p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4);
}
p = screendata + (TXT_SCREEN_H - 1) * TXT_SCREEN_W * 2;
for (i=0; i<TXT_SCREEN_W; ++i)
{
*p++ = ' ';
*p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4);
}
// Print the title
TXT_GotoXY(0, 0);
TXT_FGColor(TXT_COLOR_BLACK);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_DrawString(" ");
TXT_DrawString(title);
}
void TXT_DrawShadow(int x, int y, int w, int h)
{
unsigned char *screendata;
unsigned char *p;
int x1, y1;
screendata = TXT_GetScreenData();
for (y1=y; y1<y+h; ++y1)
{
p = screendata + (y1 * TXT_SCREEN_W + x) * 2;
for (x1=x; x1<x+w; ++x1)
{
if (VALID_X(x1) && VALID_Y(y1))
{
p[1] = TXT_COLOR_DARK_GREY;
}
p += 2;
}
}
}
void TXT_DrawWindowFrame(const char *title, int x, int y, int w, int h)
{
txt_saved_colors_t colors;
int x1, y1;
int bx, by;
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BRIGHT_CYAN);
for (y1=y; y1<y+h; ++y1)
{
// Select the appropriate row and column in the borders
// array to pick the appropriate character to draw at
// this location.
//
// Draw a horizontal line on the third line down, so we
// draw a box around the title.
by = y1 == y ? 0 :
y1 == y + 2 && title != NULL ? 2 :
y1 == y + h - 1 ? 3 : 1;
for (x1=x; x1<x+w; ++x1)
{
bx = x1 == x ? 0 :
x1 == x + w - 1 ? 3 : 1;
if (VALID_X(x1) && VALID_Y(y1))
{
TXT_GotoXY(x1, y1);
TXT_PutChar(borders[by][bx]);
}
}
}
// Draw the title
if (title != NULL)
{
TXT_GotoXY(x + 1, y + 1);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_FGColor(TXT_COLOR_BLUE);
for (x1=0; x1<w-2; ++x1)
{
TXT_DrawString(" ");
}
TXT_GotoXY(x + (w - strlen(title)) / 2, y + 1);
TXT_DrawString(title);
}
// Draw the window's shadow.
TXT_DrawShadow(x + 2, y + h, w, 1);
TXT_DrawShadow(x + w, y + 1, 2, h);
TXT_RestoreColors(&colors);
}
void TXT_DrawSeparator(int x, int y, int w)
{
txt_saved_colors_t colors;
unsigned char *data;
int x1;
int b;
data = TXT_GetScreenData();
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BRIGHT_CYAN);
if (!VALID_Y(y))
{
return;
}
data += (y * TXT_SCREEN_W + x) * 2;
for (x1=x; x1<x+w; ++x1)
{
TXT_GotoXY(x1, y);
b = x1 == x ? 0 :
x1 == x + w - 1 ? 3 :
1;
if (VALID_X(x1))
{
// Read the current value from the screen
// Check that it matches what the window should look like if
// there is no separator, then apply the separator
if (*data == borders[1][b])
{
TXT_PutChar(borders[2][b]);
}
}
data += 2;
}
TXT_RestoreColors(&colors);
}
void TXT_DrawString(const char *s)
{
int x, y;
int x1;
const char *p;
TXT_GetXY(&x, &y);
if (VALID_Y(y))
{
x1 = x;
for (p = s; *p != '\0'; ++p)
{
if (VALID_X(x1))
{
TXT_GotoXY(x1, y);
TXT_PutChar(*p);
}
x1 += 1;
}
}
TXT_GotoXY(x + strlen(s), y);
}
static void PutUnicodeChar(unsigned int c)
{
unsigned int i;
if (c < 128)
{
TXT_PutChar(c);
return;
}
// We can only display this character if it is in the CP437 codepage.
for (i = 0; i < 128; ++i)
{
if (cp437_unicode[i] == c)
{
TXT_PutChar(128 + i);
return;
}
}
// Otherwise, print a fallback character (inverted question mark):
TXT_PutChar('\xa8');
}
int TXT_CanDrawCharacter(unsigned int c)
{
unsigned int i;
// Standard ASCII range?
if (c < 128)
{
return 1;
}
// Extended ASCII range?
for (i = 0; i < 128; ++i)
{
if (cp437_unicode[i] == c)
{
return 1;
}
}
// Nope.
return 0;
}
void TXT_DrawUTF8String(const char *s)
{
int x, y;
int x1;
const char *p;
unsigned int c;
TXT_GetXY(&x, &y);
if (VALID_Y(y))
{
x1 = x;
for (p = s; *p != '\0'; )
{
c = TXT_DecodeUTF8(&p);
if (c == 0)
{
break;
}
if (VALID_X(x1))
{
TXT_GotoXY(x1, y);
PutUnicodeChar(c);
}
x1 += 1;
}
}
TXT_GotoXY(x + TXT_UTF8_Strlen(s), y);
}
void TXT_DrawHorizScrollbar(int x, int y, int w, int cursor, int range)
{
txt_saved_colors_t colors;
int x1;
int cursor_x;
if (!VALID_Y(y))
{
return;
}
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BLACK);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_GotoXY(x, y);
TXT_PutChar('\x1b');
cursor_x = x + 1;
if (range > 0)
{
cursor_x += (cursor * (w - 3)) / range;
}
if (cursor_x > x + w - 2)
{
cursor_x = x + w - 2;
}
for (x1=x+1; x1<x+w-1; ++x1)
{
if (VALID_X(x1))
{
if (x1 == cursor_x)
{
TXT_PutChar('\xdb');
}
else
{
TXT_PutChar('\xb1');
}
}
}
TXT_PutChar('\x1a');
TXT_RestoreColors(&colors);
}
void TXT_DrawVertScrollbar(int x, int y, int h, int cursor, int range)
{
txt_saved_colors_t colors;
int y1;
int cursor_y;
if (!VALID_X(x))
{
return;
}
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BLACK);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_GotoXY(x, y);
TXT_PutChar('\x18');
cursor_y = y + 1;
if (cursor_y > y + h - 2)
{
cursor_y = y + h - 2;
}
if (range > 0)
{
cursor_y += (cursor * (h - 3)) / range;
}
for (y1=y+1; y1<y+h-1; ++y1)
{
if (VALID_Y(y1))
{
TXT_GotoXY(x, y1);
if (y1 == cursor_y)
{
TXT_PutChar('\xdb');
}
else
{
TXT_PutChar('\xb1');
}
}
}
TXT_GotoXY(x, y + h - 1);
TXT_PutChar('\x19');
TXT_RestoreColors(&colors);
}
void TXT_InitClipArea(void)
{
if (cliparea == NULL)
{
cliparea = malloc(sizeof(txt_cliparea_t));
cliparea->x1 = 0;
cliparea->x2 = TXT_SCREEN_W;
cliparea->y1 = 0;
cliparea->y2 = TXT_SCREEN_H;
cliparea->next = NULL;
}
}
void TXT_PushClipArea(int x1, int x2, int y1, int y2)
{
txt_cliparea_t *newarea;
newarea = malloc(sizeof(txt_cliparea_t));
// Set the new clip area to the intersection of the old
// area and the new one.
newarea->x1 = cliparea->x1;
newarea->x2 = cliparea->x2;
newarea->y1 = cliparea->y1;
newarea->y2 = cliparea->y2;
if (x1 > newarea->x1)
newarea->x1 = x1;
if (x2 < newarea->x2)
newarea->x2 = x2;
if (y1 > newarea->y1)
newarea->y1 = y1;
if (y2 < newarea->y2)
newarea->y2 = y2;
#if 0
printf("New scrollable area: %i,%i-%i,%i\n", x1, y1, x2, y2);
#endif
// Hook into the list
newarea->next = cliparea;
cliparea = newarea;
}
void TXT_PopClipArea(void)
{
txt_cliparea_t *next_cliparea;
// Never pop the last entry
if (cliparea->next == NULL)
return;
// Unlink the last entry and delete
next_cliparea = cliparea->next;
free(cliparea);
cliparea = next_cliparea;
}