mirror of
https://github.com/libretro/scummvm.git
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281 lines
8.2 KiB
C++
281 lines
8.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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* Text utilities.
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*/
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#include "tinsel/dw.h"
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#include "tinsel/graphics.h" // object plotting
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#include "tinsel/handle.h"
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#include "tinsel/sched.h" // process scheduler defines
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#include "tinsel/strres.h" // bMultiByte
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#include "tinsel/text.h" // text defines
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namespace Tinsel {
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/**
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* Returns the length of one line of a string in pixels.
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* @param szStr String
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* @param pFont Which font to use for dimensions
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*/
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int StringLengthPix(char *szStr, const FONT *pFont) {
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int strLen; // accumulated length of string
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byte c;
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SCNHANDLE hImg;
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// while not end of string or end of line
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for (strLen = 0; (c = *szStr) != EOS_CHAR && c != LF_CHAR; szStr++) {
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if (bMultiByte) {
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if (c & 0x80)
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c = ((c & ~0x80) << 8) + *++szStr;
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}
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hImg = FROM_LE_32(pFont->fontDef[c]);
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if (hImg) {
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// there is a IMAGE for this character
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const IMAGE *pChar = (const IMAGE *)LockMem(hImg);
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// add width of font bitmap
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strLen += FROM_LE_16(pChar->imgWidth);
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} else
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// use width of space character
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strLen += FROM_LE_32(pFont->spaceSize);
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// finally add the inter-character spacing
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strLen += FROM_LE_32(pFont->xSpacing);
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}
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// return length of line in pixels - minus inter-char spacing for last character
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strLen -= FROM_LE_32(pFont->xSpacing);
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return (strLen > 0) ? strLen : 0;
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}
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/**
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* Returns the justified x start position of a line of text.
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* @param szStr String to output
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* @param xPos X position of string
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* @param pFont Which font to use
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* @param mode Mode flags for the string
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*/
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int JustifyText(char *szStr, int xPos, const FONT *pFont, int mode) {
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if (mode & TXT_CENTRE) {
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// centre justify the text
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// adjust x positioning by half the length of line in pixels
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xPos -= StringLengthPix(szStr, pFont) / 2;
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} else if (mode & TXT_RIGHT) {
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// right justify the text
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// adjust x positioning by length of line in pixels
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xPos -= StringLengthPix(szStr, pFont);
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}
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// return text line x start position
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return xPos;
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}
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/**
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* Main text outputting routine. If a object list is specified a
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* multi-object is created for the whole text and a pointer to the head
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* of the list is returned.
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* @param pList Object list to add text to
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* @param szStr String to output
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* @param colour Colour for monochrome text
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* @param xPos X position of string
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* @param yPos Y position of string
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* @param hFont Which font to use
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* @param mode Mode flags for the string
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* @param sleepTime Sleep time between each character (if non-zero)
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*/
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OBJECT *ObjectTextOut(CORO_PARAM, OBJECT *pList, char *szStr, int colour,
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int xPos, int yPos, SCNHANDLE hFont, int mode, int sleepTime) {
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int xJustify; // x position of text after justification
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int yOffset; // offset to next line of text
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OBJECT *pFirst; // head of multi-object text list
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OBJECT *pChar = 0; // object ptr for the character
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byte c;
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SCNHANDLE hImg;
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const IMAGE *pImg;
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// make sure there is a linked list to add text to
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assert(pList);
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// get font pointer
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const FONT *pFont = (const FONT *)LockMem(hFont);
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// init head of text list
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pFirst = NULL;
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// get image for capital W
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assert(pFont->fontDef[(int)'W']);
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pImg = (const IMAGE *)LockMem(FROM_LE_32(pFont->fontDef[(int)'W']));
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// get height of capital W for offset to next line
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yOffset = FROM_LE_16(pImg->imgHeight) & ~C16_FLAG_MASK;
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while (*szStr) {
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// x justify the text according to the mode flags
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xJustify = JustifyText(szStr, xPos, pFont, mode);
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// repeat until end of string or end of line
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while ((c = *szStr) != EOS_CHAR && c != LF_CHAR) {
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if (bMultiByte) {
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if (c & 0x80)
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c = ((c & ~0x80) << 8) + *++szStr;
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}
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hImg = FROM_LE_32(pFont->fontDef[c]);
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if (hImg == 0) {
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// no image for this character
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// add font spacing for a space character
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xJustify += FROM_LE_32(pFont->spaceSize);
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} else { // printable character
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int aniX, aniY; // char image animation offsets
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OBJ_INIT oi;
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oi.hObjImg = FROM_LE_32(pFont->fontInit.hObjImg);
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oi.objFlags = FROM_LE_32(pFont->fontInit.objFlags);
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oi.objID = FROM_LE_32(pFont->fontInit.objID);
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oi.objX = FROM_LE_32(pFont->fontInit.objX);
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oi.objY = FROM_LE_32(pFont->fontInit.objY);
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oi.objZ = FROM_LE_32(pFont->fontInit.objZ);
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// allocate and init a character object
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if (pFirst == NULL)
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// first time - init head of list
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pFirst = pChar = InitObject(&oi); // FIXME: endian issue using fontInit!!!
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else
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// chain to multi-char list
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pChar = pChar->pSlave = InitObject(&oi); // FIXME: endian issue using fontInit!!!
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// convert image handle to pointer
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pImg = (const IMAGE *)LockMem(hImg);
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// fill in character object
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pChar->hImg = hImg; // image def
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pChar->width = FROM_LE_16(pImg->imgWidth); // width of chars bitmap
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pChar->height = FROM_LE_16(pImg->imgHeight) & ~C16_FLAG_MASK; // height of chars bitmap
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pChar->hBits = FROM_LE_32(pImg->hImgBits); // bitmap
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// check for absolute positioning
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if (mode & TXT_ABSOLUTE)
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pChar->flags |= DMA_ABS;
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// set characters colour - only effective for mono fonts
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pChar->constant = colour;
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// get Y animation offset
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GetAniOffset(hImg, pChar->flags, &aniX, &aniY);
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// set x position - ignore animation point
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pChar->xPos = intToFrac(xJustify);
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// set y position - adjust for animation point
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pChar->yPos = intToFrac(yPos - aniY);
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if (mode & TXT_SHADOW) {
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// we want to shadow the character
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OBJECT *pShad;
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// allocate a object for the shadow and chain to multi-char list
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pShad = pChar->pSlave = AllocObject();
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// copy the character for a shadow
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CopyObject(pShad, pChar);
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// add shadow offsets to characters position
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pShad->xPos += intToFrac(FROM_LE_32(pFont->xShadow));
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pShad->yPos += intToFrac(FROM_LE_32(pFont->yShadow));
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// shadow is behind the character
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pShad->zPos--;
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// shadow is always mono
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pShad->flags = DMA_CNZ | DMA_CHANGED;
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// check for absolute positioning
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if (mode & TXT_ABSOLUTE)
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pShad->flags |= DMA_ABS;
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// shadow always uses first palette entry
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// should really alloc a palette here also ????
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pShad->constant = 1;
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// add shadow to object list
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InsertObject(pList, pShad);
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}
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// add character to object list
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InsertObject(pList, pChar);
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// move to end of list
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if (pChar->pSlave)
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pChar = pChar->pSlave;
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// add character spacing
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xJustify += FROM_LE_16(pImg->imgWidth);
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}
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// finally add the inter-character spacing
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xJustify += FROM_LE_32(pFont->xSpacing);
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// next character in string
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++szStr;
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}
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// adjust the text y position and add the inter-line spacing
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yPos += yOffset + FROM_LE_32(pFont->ySpacing);
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// check for newline
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if (c == LF_CHAR)
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// next character in string
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++szStr;
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}
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// return head of list
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return pFirst;
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}
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/**
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* Is there an image for this character in this font?
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* @param hFont which font to use
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* @param c character to test
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*/
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bool IsCharImage(SCNHANDLE hFont, char c) {
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byte c2 = (byte)c;
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// Inventory save game name editor needs to be more clever for
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// multi-byte characters. This bodge will stop it erring.
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if (bMultiByte && (c2 & 0x80))
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return false;
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// get font pointer
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const FONT *pFont = (const FONT *)LockMem(hFont);
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return pFont->fontDef[c2] != 0;
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}
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} // End of namespace Tinsel
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