scummvm/engines/lab/image.cpp
2021-12-26 18:48:43 +01:00

136 lines
3.5 KiB
C++

/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
* This code is based on Labyrinth of Time code with assistance of
*
* Copyright (c) 1993 Terra Nova Development
* Copyright (c) 2004 The Wyrmkeep Entertainment Co.
*
*/
#include "common/file.h"
#include "lab/lab.h"
#include "lab/dispman.h"
#include "lab/image.h"
namespace Lab {
Image::Image(Common::File *s, LabEngine *vm) : _vm(vm) {
_width = s->readUint16LE();
_height = s->readUint16LE();
s->skip(4);
uint32 size = _width * _height;
if (size & 1)
size++;
_imageData = new byte[size];
s->read(_imageData, size);
_autoFree = true;
}
Image::~Image() {
if (_autoFree)
delete[] _imageData;
}
void Image::setData(byte *d, bool autoFree) {
if (_autoFree)
delete[] _imageData;
_imageData = d;
_autoFree = autoFree;
}
void Image::blitBitmap(uint16 srcX, uint16 srcY, Image *imgDest,
uint16 destX, uint16 destY, uint16 width, uint16 height, byte masked) {
int clipWidth = width;
int clipHeight = height;
int destWidth = (imgDest) ? imgDest->_width : _vm->_graphics->_screenWidth;
int destHeight = (imgDest) ? imgDest->_height : _vm->_graphics->_screenHeight;
byte *destBuffer = (imgDest) ? imgDest->_imageData : _vm->_graphics->getCurrentDrawingBuffer();
if (destX + clipWidth > destWidth)
clipWidth = destWidth - destX;
if (destY + clipHeight > destHeight)
clipHeight = destHeight - destY;
if ((clipWidth > 0) && (clipHeight > 0)) {
byte *img = _imageData + srcY * _width + srcX;
byte *dest = destBuffer + destY * destWidth + destX;
if (!masked) {
for (int i = 0; i < clipHeight; i++) {
memcpy(dest, img, clipWidth);
img += _width;
dest += destWidth;
}
} else {
for (int i = 0; i < clipHeight; i++) {
for (int j = 0; j < clipWidth; j++) {
byte c = img[j];
if (c)
dest[j] = c - 1;
}
img += _width;
dest += destWidth;
}
}
}
}
void Image::drawImage(uint16 x, uint16 y) {
blitBitmap(0, 0, nullptr, x, y, _width, _height, false);
}
void Image::drawMaskImage(uint16 x, uint16 y) {
blitBitmap(0, 0, nullptr, x, y, _width, _height, true);
}
void Image::readScreenImage(uint16 x, uint16 y) {
int clipWidth = _width;
int clipHeight = _height;
if (x + clipWidth > _vm->_graphics->_screenWidth)
clipWidth = _vm->_graphics->_screenWidth - x;
if (y + clipHeight > _vm->_graphics->_screenHeight)
clipHeight = _vm->_graphics->_screenHeight - y;
if ((clipWidth > 0) && (clipHeight > 0)) {
byte *img = _imageData;
byte *screen = _vm->_graphics->getCurrentDrawingBuffer() + y * _vm->_graphics->_screenWidth + x;
while (clipHeight-- > 0) {
memcpy(img, screen, clipWidth);
img += _width;
screen += _vm->_graphics->_screenWidth;
}
}
}
} // End of namespace Lab