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engines/lab/image.cpp

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+/* 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