mirror of
https://github.com/VDR4Arch/vdr.git
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784 lines
21 KiB
C
784 lines
21 KiB
C
/*
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* osd.c: Abstract On Screen Display layer
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*
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: osd.c 1.49 2004/06/05 11:15:43 kls Exp $
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*/
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#include "osd.h"
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#include <math.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/unistd.h>
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#include "tools.h"
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// --- cPalette --------------------------------------------------------------
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cPalette::cPalette(int Bpp)
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{
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SetBpp(Bpp);
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}
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void cPalette::Reset(void)
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{
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numColors = 0;
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modified = false;
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}
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int cPalette::Index(tColor Color)
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{
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for (int i = 0; i < numColors; i++) {
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if (color[i] == Color)
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return i;
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}
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if (numColors < maxColors) {
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color[numColors++] = Color;
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modified = true;
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return numColors - 1;
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}
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dsyslog("too many different colors used in palette");
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//TODO: return the index of the "closest" color?
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return 0;
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}
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void cPalette::SetBpp(int Bpp)
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{
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bpp = Bpp;
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maxColors = 1 << bpp;
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Reset();
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}
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void cPalette::SetColor(int Index, tColor Color)
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{
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if (Index < maxColors) {
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if (numColors <= Index) {
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numColors = Index + 1;
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modified = true;
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}
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else
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modified |= color[Index] != Color;
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color[Index] = Color;
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}
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}
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const tColor *cPalette::Colors(int &NumColors)
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{
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NumColors = numColors;
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return numColors ? color : NULL;
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}
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void cPalette::Take(const cPalette &Palette, tIndexes *Indexes, tColor ColorFg, tColor ColorBg)
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{
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for (int i = 0; i < Palette.numColors; i++) {
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tColor Color = Palette.color[i];
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if (ColorFg || ColorBg) {
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switch (i) {
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case 0: Color = ColorBg; break;
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case 1: Color = ColorFg; break;
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}
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}
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int n = Index(Color);
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if (Indexes)
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(*Indexes)[i] = n;
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}
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}
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// --- cBitmap ---------------------------------------------------------------
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cBitmap::cBitmap(int Width, int Height, int Bpp, int X0, int Y0)
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:cPalette(Bpp)
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{
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bitmap = NULL;
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x0 = X0;
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y0 = Y0;
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SetSize(Width, Height);
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}
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cBitmap::cBitmap(const char *FileName)
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{
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bitmap = NULL;
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x0 = 0;
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y0 = 0;
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LoadXpm(FileName);
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}
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cBitmap::cBitmap(char *Xpm[])
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{
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bitmap = NULL;
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x0 = 0;
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y0 = 0;
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SetXpm(Xpm);
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}
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cBitmap::~cBitmap()
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{
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free(bitmap);
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}
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void cBitmap::SetSize(int Width, int Height)
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{
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if (bitmap && Width == width && Height == height)
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return;
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width = Width;
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height = Height;
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free(bitmap);
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bitmap = NULL;
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dirtyX1 = 0;
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dirtyY1 = 0;
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dirtyX2 = width - 1;
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dirtyY2 = height - 1;
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if (width > 0 && height > 0) {
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bitmap = MALLOC(tIndex, width * height);
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if (bitmap)
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memset(bitmap, 0x00, width * height);
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else
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esyslog("ERROR: can't allocate bitmap!");
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}
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else
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esyslog("ERROR: illegal bitmap parameters (%d, %d)!", width, height);
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}
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bool cBitmap::Contains(int x, int y) const
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{
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x -= x0;
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y -= y0;
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return 0 <= x && x < width && 0 <= y && y < height;
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}
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bool cBitmap::Covers(int x1, int y1, int x2, int y2) const
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{
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x1 -= x0;
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y1 -= y0;
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x2 -= x0;
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y2 -= y0;
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return x1 <= 0 && y1 <= 0 && x2 >= width - 1 && y2 >= height - 1;
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}
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bool cBitmap::Intersects(int x1, int y1, int x2, int y2) const
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{
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x1 -= x0;
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y1 -= y0;
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x2 -= x0;
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y2 -= y0;
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return !(x2 < 0 || x1 >= width || y2 < 0 || y1 >= height);
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}
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bool cBitmap::Dirty(int &x1, int &y1, int &x2, int &y2)
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{
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if (dirtyX2 >= 0) {
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x1 = dirtyX1;
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y1 = dirtyY1;
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x2 = dirtyX2;
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y2 = dirtyY2;
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return true;
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}
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return false;
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}
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void cBitmap::Clean(void)
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{
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dirtyX1 = width;
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dirtyY1 = height;
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dirtyX2 = -1;
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dirtyY2 = -1;
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}
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bool cBitmap::LoadXpm(const char *FileName)
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{
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bool Result = false;
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FILE *f = fopen(FileName, "r");
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if (f) {
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char **Xpm = NULL;
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bool isXpm = false;
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int lines = 0;
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int index = 0;
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char *s;
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while ((s = readline(f)) != NULL) {
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s = skipspace(s);
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if (!isXpm) {
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if (strcmp(s, "/* XPM */") != 0) {
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esyslog("ERROR: invalid header in XPM file '%s'", FileName);
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break;
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}
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isXpm = true;
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}
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else if (*s++ == '"') {
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if (!lines) {
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int w, h, n, c;
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if (4 != sscanf(s, "%d %d %d %d", &w, &h, &n, &c)) {
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esyslog("ERROR: faulty 'values' line in XPM file '%s'", FileName);
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break;
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}
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lines = h + n + 1;
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Xpm = MALLOC(char *, lines);
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}
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char *q = strchr(s, '"');
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if (!q) {
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esyslog("ERROR: missing quotes in XPM file '%s'", FileName);
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break;
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}
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*q = 0;
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if (index < lines)
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Xpm[index++] = strdup(s);
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else {
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esyslog("ERROR: too many lines in XPM file '%s'", FileName);
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break;
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}
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}
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}
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if (index == lines)
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Result = SetXpm(Xpm);
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else
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esyslog("ERROR: too few lines in XPM file '%s'", FileName);
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for (int i = 0; i < index; i++)
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free(Xpm[i]);
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free(Xpm);
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fclose(f);
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}
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else
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esyslog("ERROR: can't open XPM file '%s'", FileName);
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return Result;
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}
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bool cBitmap::SetXpm(char *Xpm[])
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{
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char **p = Xpm;
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int w, h, n, c;
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if (4 != sscanf(*p, "%d %d %d %d", &w, &h, &n, &c)) {
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esyslog("ERROR: faulty 'values' line in XPM: '%s'", *p);
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return false;
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}
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if (n > MAXNUMCOLORS) {
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esyslog("ERROR: too many colors in XPM: %d", n);
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return false;
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}
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int b = 0;
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while (1 << (1 << b) < n)
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b++;
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SetBpp(1 << b);
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SetSize(w, h);
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for (int i = 0; i < n; i++) {
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const char *s = *++p;
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if (int(strlen(s)) < c) {
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esyslog("ERROR: faulty 'colors' line in XPM: '%s'", s);
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return false;
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}
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s = skipspace(s + c);
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if (*s != 'c') {
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esyslog("ERROR: unknown color key in XPM: '%c'", *s);
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return false;
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}
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s = skipspace(s + 1);
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if (strcasecmp(s, "none") == 0)
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s = "#00000000";
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if (*s != '#') {
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esyslog("ERROR: unknown color code in XPM: '%c'", *s);
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return false;
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}
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tColor color = strtoul(++s, NULL, 16) | 0xFF000000;
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SetColor(i, color);
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}
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for (int y = 0; y < h; y++) {
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const char *s = *++p;
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if (int(strlen(s)) != w * c) {
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esyslog("ERROR: faulty pixel line in XPM: %d '%s'", y, s);
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return false;
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}
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for (int x = 0; x < w; x++) {
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for (int i = 0; i <= n; i++) {
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if (i == n) {
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esyslog("ERROR: undefined pixel color in XPM: %d %d '%s'", x, y, s);
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return false;
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}
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if (strncmp(Xpm[i + 1], s, c) == 0) {
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SetIndex(x, y, i);
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break;
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}
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}
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s += c;
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}
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}
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return true;
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}
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void cBitmap::SetIndex(int x, int y, tIndex Index)
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{
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if (bitmap) {
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if (0 <= x && x < width && 0 <= y && y < height) {
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if (bitmap[width * y + x] != Index) {
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bitmap[width * y + x] = Index;
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if (dirtyX1 > x) dirtyX1 = x;
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if (dirtyY1 > y) dirtyY1 = y;
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if (dirtyX2 < x) dirtyX2 = x;
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if (dirtyY2 < y) dirtyY2 = y;
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}
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}
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}
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}
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void cBitmap::DrawPixel(int x, int y, tColor Color)
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{
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x -= x0;
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y -= y0;
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if (0 <= x && x < width && 0 <= y && y < height)
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SetIndex(x, y, Index(Color));
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}
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void cBitmap::DrawBitmap(int x, int y, const cBitmap &Bitmap, tColor ColorFg, tColor ColorBg)
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{
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if (bitmap && Bitmap.bitmap && Intersects(x, y, x + Bitmap.Width() - 1, y + Bitmap.Height() - 1)) {
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if (Covers(x, y, x + Bitmap.Width() - 1, y + Bitmap.Height() - 1))
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Reset();
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x -= x0;
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y -= y0;
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tIndexes Indexes;
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Take(Bitmap, &Indexes, ColorFg, ColorBg);
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for (int ix = 0; ix < Bitmap.width; ix++) {
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for (int iy = 0; iy < Bitmap.height; iy++)
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SetIndex(x + ix, y + iy, Indexes[int(Bitmap.bitmap[Bitmap.width * iy + ix])]);
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}
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}
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}
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void cBitmap::DrawText(int x, int y, const char *s, tColor ColorFg, tColor ColorBg, const cFont *Font, int Width, int Height, int Alignment)
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{
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if (bitmap) {
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int w = Font->Width(s);
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int h = Font->Height();
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int limit = 0;
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if (Width || Height) {
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int cw = Width ? Width : w;
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int ch = Height ? Height : h;
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if (!Intersects(x, y, x + cw - 1, y + ch - 1))
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return;
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DrawRectangle(x, y, x + cw - 1, y + ch - 1, ColorBg);
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limit = x + cw - x0;
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if (Width) {
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if ((Alignment & taLeft) != 0)
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;
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else if ((Alignment & taRight) != 0) {
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if (w < Width)
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x += Width - w;
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}
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else { // taCentered
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if (w < Width)
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x += (Width - w) / 2;
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}
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}
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if (Height) {
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if ((Alignment & taTop) != 0)
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;
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else if ((Alignment & taBottom) != 0) {
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if (h < Height)
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y += Height - h;
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}
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else { // taCentered
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if (h < Height)
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y += (Height - h) / 2;
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}
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}
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}
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else if (!Intersects(x, y, x + w - 1, y + h - 1))
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return;
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x -= x0;
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y -= y0;
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tIndex fg = Index(ColorFg);
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tIndex bg = Index(ColorBg);
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while (s && *s) {
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const cFont::tCharData *CharData = Font->CharData(*s++);
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if (limit && int(x + CharData->width) > limit)
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break; // we don't draw partial characters
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if (int(x + CharData->width) > 0) {
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for (int row = 0; row < h; row++) {
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cFont::tPixelData PixelData = CharData->lines[row];
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for (int col = CharData->width; col-- > 0; ) {
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SetIndex(x + col, y + row, (PixelData & 1) ? fg : bg);
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PixelData >>= 1;
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}
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}
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}
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x += CharData->width;
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if (x > width - 1)
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break;
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}
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}
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}
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void cBitmap::DrawRectangle(int x1, int y1, int x2, int y2, tColor Color)
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{
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if (bitmap && Intersects(x1, y1, x2, y2)) {
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if (Covers(x1, y1, x2, y2))
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Reset();
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x1 -= x0;
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y1 -= y0;
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x2 -= x0;
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y2 -= y0;
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x1 = max(x1, 0);
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y1 = max(y1, 0);
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x2 = min(x2, width - 1);
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y2 = min(y2, height - 1);
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tIndex c = Index(Color);
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for (int y = y1; y <= y2; y++)
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for (int x = x1; x <= x2; x++)
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SetIndex(x, y, c);
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}
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}
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void cBitmap::DrawEllipse(int x1, int y1, int x2, int y2, tColor Color, int Quadrants)
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{
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if (!Intersects(x1, y1, x2, y2))
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return;
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// Algorithm based on http://homepage.smc.edu/kennedy_john/BELIPSE.PDF
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int rx = x2 - x1;
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int ry = y2 - y1;
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int cx = (x1 + x2) / 2;
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int cy = (y1 + y2) / 2;
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switch (abs(Quadrants)) {
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case 0: rx /= 2; ry /= 2; break;
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case 1: cx = x1; cy = y2; break;
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case 2: cx = x2; cy = y2; break;
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case 3: cx = x2; cy = y1; break;
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case 4: cx = x1; cy = y1; break;
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case 5: cx = x1; ry /= 2; break;
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case 6: cy = y2; rx /= 2; break;
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case 7: cx = x2; ry /= 2; break;
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case 8: cy = y1; rx /= 2; break;
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}
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int TwoASquare = 2 * rx * rx;
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int TwoBSquare = 2 * ry * ry;
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int x = rx;
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int y = 0;
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int XChange = ry * ry * (1 - 2 * rx);
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int YChange = rx * rx;
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int EllipseError = 0;
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int StoppingX = TwoBSquare * rx;
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int StoppingY = 0;
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while (StoppingX >= StoppingY) {
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switch (Quadrants) {
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case 5: DrawRectangle(cx, cy + y, cx + x, cy + y, Color); // no break
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case 1: DrawRectangle(cx, cy - y, cx + x, cy - y, Color); break;
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case 7: DrawRectangle(cx - x, cy + y, cx, cy + y, Color); // no break
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case 2: DrawRectangle(cx - x, cy - y, cx, cy - y, Color); break;
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case 3: DrawRectangle(cx - x, cy + y, cx, cy + y, Color); break;
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case 4: DrawRectangle(cx, cy + y, cx + x, cy + y, Color); break;
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case 0:
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case 6: DrawRectangle(cx - x, cy - y, cx + x, cy - y, Color); if (Quadrants == 6) break;
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case 8: DrawRectangle(cx - x, cy + y, cx + x, cy + y, Color); break;
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case -1: DrawRectangle(cx + x, cy - y, x2, cy - y, Color); break;
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case -2: DrawRectangle(x1, cy - y, cx - x, cy - y, Color); break;
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case -3: DrawRectangle(x1, cy + y, cx - x, cy + y, Color); break;
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case -4: DrawRectangle(cx + x, cy + y, x2, cy + y, Color); break;
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}
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y++;
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StoppingY += TwoASquare;
|
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EllipseError += YChange;
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YChange += TwoASquare;
|
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if (2 * EllipseError + XChange > 0) {
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x--;
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StoppingX -= TwoBSquare;
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EllipseError += XChange;
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XChange += TwoBSquare;
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}
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}
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x = 0;
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y = ry;
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XChange = ry * ry;
|
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YChange = rx * rx * (1 - 2 * ry);
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EllipseError = 0;
|
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StoppingX = 0;
|
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StoppingY = TwoASquare * ry;
|
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while (StoppingX <= StoppingY) {
|
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switch (Quadrants) {
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case 5: DrawRectangle(cx, cy + y, cx + x, cy + y, Color); // no break
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case 1: DrawRectangle(cx, cy - y, cx + x, cy - y, Color); break;
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case 7: DrawRectangle(cx - x, cy + y, cx, cy + y, Color); // no break
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case 2: DrawRectangle(cx - x, cy - y, cx, cy - y, Color); break;
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case 3: DrawRectangle(cx - x, cy + y, cx, cy + y, Color); break;
|
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case 4: DrawRectangle(cx, cy + y, cx + x, cy + y, Color); break;
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case 0:
|
|
case 6: DrawRectangle(cx - x, cy - y, cx + x, cy - y, Color); if (Quadrants == 6) break;
|
|
case 8: DrawRectangle(cx - x, cy + y, cx + x, cy + y, Color); break;
|
|
case -1: DrawRectangle(cx + x, cy - y, x2, cy - y, Color); break;
|
|
case -2: DrawRectangle(x1, cy - y, cx - x, cy - y, Color); break;
|
|
case -3: DrawRectangle(x1, cy + y, cx - x, cy + y, Color); break;
|
|
case -4: DrawRectangle(cx + x, cy + y, x2, cy + y, Color); break;
|
|
}
|
|
x++;
|
|
StoppingX += TwoBSquare;
|
|
EllipseError += XChange;
|
|
XChange += TwoBSquare;
|
|
if (2 * EllipseError + YChange > 0) {
|
|
y--;
|
|
StoppingY -= TwoASquare;
|
|
EllipseError += YChange;
|
|
YChange += TwoASquare;
|
|
}
|
|
}
|
|
}
|
|
|
|
void cBitmap::DrawSlope(int x1, int y1, int x2, int y2, tColor Color, int Type)
|
|
{
|
|
// TODO This is just a quick and dirty implementation of a slope drawing
|
|
// machanism. If somebody can come up with a better solution, let's have it!
|
|
if (!Intersects(x1, y1, x2, y2))
|
|
return;
|
|
bool upper = Type & 0x01;
|
|
bool falling = Type & 0x02;
|
|
bool vertical = Type & 0x04;
|
|
if (vertical) {
|
|
for (int y = y1; y <= y2; y++) {
|
|
double c = cos((y - y1) * M_PI / (y2 - y1 + 1));
|
|
if (falling)
|
|
c = -c;
|
|
int x = int((x2 - x1 + 1) * c / 2);
|
|
if (upper && !falling || !upper && falling)
|
|
DrawRectangle(x1, y, (x1 + x2) / 2 + x, y, Color);
|
|
else
|
|
DrawRectangle((x1 + x2) / 2 + x, y, x2, y, Color);
|
|
}
|
|
}
|
|
else {
|
|
for (int x = x1; x <= x2; x++) {
|
|
double c = cos((x - x1) * M_PI / (x2 - x1 + 1));
|
|
if (falling)
|
|
c = -c;
|
|
int y = int((y2 - y1 + 1) * c / 2);
|
|
if (upper)
|
|
DrawRectangle(x, y1, x, (y1 + y2) / 2 + y, Color);
|
|
else
|
|
DrawRectangle(x, (y1 + y2) / 2 + y, x, y2, Color);
|
|
}
|
|
}
|
|
}
|
|
|
|
const tIndex *cBitmap::Data(int x, int y)
|
|
{
|
|
return &bitmap[y * width + x];
|
|
}
|
|
|
|
// --- cOsd ------------------------------------------------------------------
|
|
|
|
bool cOsd::isOpen = false;
|
|
|
|
cOsd::cOsd(int Left, int Top)
|
|
{
|
|
if (isOpen)
|
|
esyslog("ERROR: OSD opened without closing previous OSD!");
|
|
savedRegion = NULL;
|
|
numBitmaps = 0;
|
|
left = Left;
|
|
top = Top;
|
|
width = height = 0;
|
|
isOpen = true;
|
|
}
|
|
|
|
cOsd::~cOsd()
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
delete bitmaps[i];
|
|
delete savedRegion;
|
|
isOpen = false;
|
|
}
|
|
|
|
cBitmap *cOsd::GetBitmap(int Area)
|
|
{
|
|
return Area < numBitmaps ? bitmaps[Area] : NULL;
|
|
}
|
|
|
|
eOsdError cOsd::CanHandleAreas(const tArea *Areas, int NumAreas)
|
|
{
|
|
for (int i = 0; i < NumAreas; i++) {
|
|
for (int j = i + 1; j < NumAreas; j++) {
|
|
if (Areas[i].Intersects(Areas[j]))
|
|
return oeAreasOverlap;
|
|
if (Areas[i].x1 > Areas[i].x2 || Areas[i].y1 > Areas[i].y2 || Areas[i].x1 < 0 || Areas[i].y1 < 0)
|
|
return oeWrongAlignment;
|
|
}
|
|
}
|
|
return oeOk;
|
|
}
|
|
|
|
eOsdError cOsd::SetAreas(const tArea *Areas, int NumAreas)
|
|
{
|
|
eOsdError Result = oeUnknown;
|
|
if (numBitmaps == 0) {
|
|
Result = CanHandleAreas(Areas, NumAreas);
|
|
if (Result == oeOk) {
|
|
width = height = 0;
|
|
for (int i = 0; i < NumAreas; i++) {
|
|
bitmaps[numBitmaps++] = new cBitmap(Areas[i].Width(), Areas[i].Height(), Areas[i].bpp, Areas[i].x1, Areas[i].y1);
|
|
width = max(width, Areas[i].x2);
|
|
height = max(height, Areas[i].y2);
|
|
}
|
|
}
|
|
}
|
|
if (Result != oeOk)
|
|
esyslog("ERROR: cOsd::SetAreas returned %d\n", Result);
|
|
return Result;
|
|
}
|
|
|
|
void cOsd::SaveRegion(int x1, int y1, int x2, int y2)
|
|
{
|
|
delete savedRegion;
|
|
savedRegion = new cBitmap(x2 - x1 + 1, y2 - y1 + 1, 8, x1, y1);
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
savedRegion->DrawBitmap(bitmaps[i]->X0(), bitmaps[i]->Y0(), *bitmaps[i]);
|
|
}
|
|
|
|
void cOsd::RestoreRegion(void)
|
|
{
|
|
if (savedRegion) {
|
|
DrawBitmap(savedRegion->X0(), savedRegion->Y0(), *savedRegion);
|
|
delete savedRegion;
|
|
savedRegion = NULL;
|
|
}
|
|
}
|
|
|
|
eOsdError cOsd::SetPalette(const cPalette &Palette, int Area)
|
|
{
|
|
if (Area < numBitmaps)
|
|
bitmaps[Area]->Take(Palette);
|
|
return oeUnknown;
|
|
}
|
|
|
|
void cOsd::DrawPixel(int x, int y, tColor Color)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawPixel(x, y, Color);
|
|
}
|
|
|
|
void cOsd::DrawBitmap(int x, int y, const cBitmap &Bitmap, tColor ColorFg, tColor ColorBg)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawBitmap(x, y, Bitmap, ColorFg, ColorBg);
|
|
}
|
|
|
|
void cOsd::DrawText(int x, int y, const char *s, tColor ColorFg, tColor ColorBg, const cFont *Font, int Width, int Height, int Alignment)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawText(x, y, s, ColorFg, ColorBg, Font, Width, Height, Alignment);
|
|
}
|
|
|
|
void cOsd::DrawRectangle(int x1, int y1, int x2, int y2, tColor Color)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawRectangle(x1, y1, x2, y2, Color);
|
|
}
|
|
|
|
void cOsd::DrawEllipse(int x1, int y1, int x2, int y2, tColor Color, int Quadrants)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawEllipse(x1, y1, x2, y2, Color, Quadrants);
|
|
}
|
|
|
|
void cOsd::DrawSlope(int x1, int y1, int x2, int y2, tColor Color, int Type)
|
|
{
|
|
for (int i = 0; i < numBitmaps; i++)
|
|
bitmaps[i]->DrawSlope(x1, y1, x2, y2, Color, Type);
|
|
}
|
|
|
|
void cOsd::Flush(void)
|
|
{
|
|
}
|
|
|
|
// --- cOsdProvider ----------------------------------------------------------
|
|
|
|
cOsdProvider *cOsdProvider::osdProvider = NULL;
|
|
|
|
cOsdProvider::cOsdProvider(void)
|
|
{
|
|
delete osdProvider;
|
|
osdProvider = this;
|
|
}
|
|
|
|
cOsdProvider::~cOsdProvider()
|
|
{
|
|
osdProvider = NULL;
|
|
}
|
|
|
|
cOsd *cOsdProvider::NewOsd(int Left, int Top)
|
|
{
|
|
if (osdProvider)
|
|
return osdProvider->CreateOsd(Left, Top);
|
|
esyslog("ERROR: no OSD provider available - using dummy OSD!");
|
|
return new cOsd(Left, Top); // create a dummy cOsd, so that access won't result in a segfault
|
|
}
|
|
|
|
void cOsdProvider::Shutdown(void)
|
|
{
|
|
delete osdProvider;
|
|
osdProvider = NULL;
|
|
}
|
|
|
|
// --- cTextScroller ---------------------------------------------------------
|
|
|
|
cTextScroller::cTextScroller(void)
|
|
{
|
|
osd = NULL;
|
|
left = top = width = height = 0;
|
|
font = NULL;
|
|
colorFg = 0;
|
|
colorBg = 0;
|
|
offset = 0;
|
|
shown = 0;
|
|
}
|
|
|
|
cTextScroller::cTextScroller(cOsd *Osd, int Left, int Top, int Width, int Height, const char *Text, const cFont *Font, tColor ColorFg, tColor ColorBg)
|
|
{
|
|
Set(Osd, Left, Top, Width, Height, Text, Font, ColorFg, ColorBg);
|
|
}
|
|
|
|
void cTextScroller::Set(cOsd *Osd, int Left, int Top, int Width, int Height, const char *Text, const cFont *Font, tColor ColorFg, tColor ColorBg)
|
|
{
|
|
osd = Osd;
|
|
left = Left;
|
|
top = Top;
|
|
width = Width;
|
|
height = Height;
|
|
font = Font;
|
|
colorFg = ColorFg;
|
|
colorBg = ColorBg;
|
|
offset = 0;
|
|
textWrapper.Set(Text, Font, Width);
|
|
shown = min(Total(), height / font->Height());
|
|
height = shown * font->Height(); // sets height to the actually used height, which may be less than Height
|
|
DrawText();
|
|
}
|
|
|
|
void cTextScroller::Reset(void)
|
|
{
|
|
osd = NULL; // just makes sure it won't draw anything
|
|
}
|
|
|
|
void cTextScroller::DrawText(void)
|
|
{
|
|
if (osd) {
|
|
for (int i = 0; i < shown; i++)
|
|
osd->DrawText(left, top + i * font->Height(), textWrapper.GetLine(offset + i), colorFg, colorBg, font, width);
|
|
}
|
|
}
|
|
|
|
void cTextScroller::Scroll(bool Up, bool Page)
|
|
{
|
|
if (Up) {
|
|
if (CanScrollUp()) {
|
|
offset -= Page ? shown : 1;
|
|
if (offset < 0)
|
|
offset = 0;
|
|
DrawText();
|
|
}
|
|
}
|
|
else {
|
|
if (CanScrollDown()) {
|
|
offset += Page ? shown : 1;
|
|
if (offset + shown > Total())
|
|
offset = Total() - shown;
|
|
DrawText();
|
|
}
|
|
}
|
|
}
|