Initial commit

graphics/maccursor.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/>.
+ *
+ */
+
+#include "common/textconsole.h"
+
+#include "graphics/maccursor.h"
+
+namespace Graphics {
+
+MacCursor::MacCursor() {
+	_surface = 0;
+	memset(_palette, 0, 256 * 3);
+
+	_hotspotX = 0;
+	_hotspotY = 0;
+}
+
+MacCursor::~MacCursor() {
+	clear();
+}
+
+void MacCursor::clear() {
+	delete[] _surface; _surface = 0;
+	memset(_palette, 0, 256 * 3);
+}
+
+bool MacCursor::readFromStream(Common::SeekableReadStream &stream, bool forceMonochrome, byte monochromeInvertedPixelColor, bool forceCURSFormat) {
+	clear();
+
+	const int minCursSize = 32 * 2 + 4;
+
+	// Older Mac CURS monochrome cursors had a set size, but sometimes contain extra unused bytes
+	// All crsr cursors are larger than this
+	if (stream.size() == minCursSize || (forceCURSFormat && stream.size() >= minCursSize))
+		return readFromCURS(stream, monochromeInvertedPixelColor);
+
+	return readFromCRSR(stream, forceMonochrome, monochromeInvertedPixelColor);
+}
+
+bool MacCursor::readFromCURS(Common::SeekableReadStream &stream, byte monochromeInvertedPixelColor) {
+	// Grab B/W icon data
+	_surface = new byte[16 * 16];
+	for (int i = 0; i < 32; i++) {
+		byte imageByte = stream.readByte();
+		for (int b = 0; b < 8; b++)
+			_surface[i * 8 + b] = (byte)((imageByte & (0x80 >> b)) > 0 ? 0 : 1);
+	}
+
+	// Apply mask data
+	for (int i = 0; i < 32; i++) {
+		byte imageByte = stream.readByte();
+		for (int b = 0; b < 8; b++) {
+			if ((imageByte & (0x80 >> b)) == 0) {
+				// if an image bit is set outside the mask then the destination pixel
+				//  would have been inverted on macintosh, otherwise it's transparent.
+				//  we don't currently implement this inversion effect so instead we
+				//  use the optional color provided by the caller for these pixels.
+				_surface[i * 8 + b] = _surface[i * 8 + b] ? 0xff : monochromeInvertedPixelColor;
+			}
+		}
+	}
+
+	_hotspotY = stream.readUint16BE();
+	_hotspotX = stream.readUint16BE();
+
+	// Setup a basic palette
+	_palette[1 * 3 + 0] = 0xff;
+	_palette[1 * 3 + 1] = 0xff;
+	_palette[1 * 3 + 2] = 0xff;
+
+	return !stream.eos();
+}
+
+bool MacCursor::readFromCRSR(Common::SeekableReadStream &stream, bool forceMonochrome, byte monochromeInvertedPixelColor) {
+	stream.readUint16BE(); // type
+	stream.readUint32BE(); // offset to pixel map
+	stream.readUint32BE(); // offset to pixel data
+	stream.readUint32BE(); // expanded cursor data
+	stream.readUint16BE(); // expanded data depth
+	stream.readUint32BE(); // reserved
+
+	// Read the B/W data first
+	if (!readFromCURS(stream, monochromeInvertedPixelColor))
+		return false;
+
+	// Use b/w cursor on backends which don't support cursor palettes
+	if (forceMonochrome)
+		return true;
+
+	stream.readUint32BE(); // reserved
+	stream.readUint32BE(); // cursorID
+
+	// Color version of cursor
+	stream.readUint32BE(); // baseAddr
+
+	// Keep only lowbyte for now
+	stream.readByte();
+	int iconRowBytes = stream.readByte();
+
+	if (!iconRowBytes)
+		return false;
+
+	int iconBounds[4];
+	iconBounds[0] = stream.readUint16BE();
+	iconBounds[1] = stream.readUint16BE();
+	iconBounds[2] = stream.readUint16BE();
+	iconBounds[3] = stream.readUint16BE();
+
+	stream.readUint16BE(); // pmVersion
+	stream.readUint16BE(); // packType
+	stream.readUint32BE(); // packSize
+
+	stream.readUint32BE(); // hRes
+	stream.readUint32BE(); // vRes
+
+	stream.readUint16BE(); // pixelType
+	stream.readUint16BE(); // pixelSize
+	stream.readUint16BE(); // cmpCount
+	stream.readUint16BE(); // cmpSize
+
+	stream.readUint32BE(); // planeByte
+	stream.readUint32BE(); // pmTable
+	stream.readUint32BE(); // reserved
+
+	// Pixel data for cursor
+	int iconDataSize =  iconRowBytes * (iconBounds[3] - iconBounds[1]);
+	byte *iconData = new byte[iconDataSize];
+
+	if (!iconData)
+		error("Cannot allocate Mac color cursor iconData");
+
+	stream.read(iconData, iconDataSize);
+
+	// Color table
+	stream.readUint32BE(); // ctSeed
+	stream.readUint16BE(); // ctFlag
+	uint16 ctSize = stream.readUint16BE() + 1;
+
+	// Read just high byte of 16-bit color
+	for (int c = 0; c < ctSize; c++) {
+		stream.readUint16BE();
+		_palette[c * 3 + 0] = stream.readUint16BE() >> 8;
+		_palette[c * 3 + 1] = stream.readUint16BE() >> 8;
+		_palette[c * 3 + 2] = stream.readUint16BE() >> 8;
+	}
+
+	// Find black so that Macintosh black (255) can be remapped.
+	// This is necessary because we use 255 for the color key.
+	byte black = 0;
+	for (byte c = 0; c < 255; c++) {
+		if (_palette[c * 3 + 0] == 0 &&
+			_palette[c * 3 + 1] == 0 &&
+			_palette[c * 3 + 2] == 0) {
+			black = c;
+			break;
+		}
+	}
+
+	int pixelsPerByte = (iconBounds[2] - iconBounds[0]) / iconRowBytes;
+	int bpp           = 8 / pixelsPerByte;
+
+	// build a mask to make sure the pixels are properly shifted out
+	int bitmask = 0;
+	for (int m = 0; m < bpp; m++) {
+		bitmask <<= 1;
+		bitmask  |= 1;
+	}
+
+	// Extract pixels from bytes
+	for (int j = 0; j < iconDataSize; j++) {
+		for (int b = 0; b < pixelsPerByte; b++) {
+			int idx = j * pixelsPerByte + (pixelsPerByte - 1 - b);
+
+			if (_surface[idx] != 0xff) { // if mask is not there
+				_surface[idx] = (byte)((iconData[j] >> (b * bpp)) & bitmask);
+				// Remap Macintosh black
+				if (_surface[idx] == 255) {
+					_surface[idx] = black;
+				}
+			}
+		}
+	}
+
+	delete[] iconData;
+	return stream.pos() == stream.size();
+}
+
+} // End of namespace Common