Countless changes to the New GUI; some hightligths: new ScrollBarWidget class; ListWidget is usable (demo shows it off); added custom String/StringList classes

svn-id: r4521

gui/util.cpp

@@ -0,0 +1,246 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002 The ScummVM project
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ */
+
+#include "stdafx.h"
+#include "util.h"
+
+// 8-bit alpha blending routines
+int BlendCache[256][256];
+
+int RGBMatch(byte *palette, int r, int g, int b)
+{
+	int i, bestidx = 0, besterr = 0xFFFFFF;
+	int error = 0;
+
+	for (i = 0;i < 256;i++) {
+		byte *pal = palette + (i * 3);
+		int r_diff = r - (int)*pal++; 
+		int g_diff = g - (int)*pal++; 
+		int b_diff = b - (int)*pal++; 
+		r_diff *= r_diff; g_diff *= g_diff; b_diff *= b_diff;
+
+		error = r_diff + g_diff + b_diff;
+		if (error < besterr) {
+			besterr = error;
+			bestidx = i;
+		}
+	}
+	return bestidx;
+}
+
+int Blend(int src, int dst, byte *palette)
+{
+	int r, g, b;
+	int alpha = 128;	// Level of transparency [0-256]
+	byte *srcpal = palette + (dst  * 3);
+	byte *dstpal = palette + (src * 3);
+
+	if (BlendCache[dst][src] > -1)
+		return BlendCache[dst][src];
+
+	r =  (*srcpal++ * alpha);
+    r += (*dstpal++ * (256-alpha));
+    r /= 256;
+
+    g =  (*srcpal++ * alpha);
+    g += (*dstpal++ * (256-alpha));
+    g /= 256;
+
+    b =  (*srcpal++ * alpha);
+    b += (*dstpal++  * (256-alpha));
+    b /= 256;
+       
+	return (BlendCache[dst][src] = RGBMatch(palette, r , g , b ));
+}
+
+void ClearBlendCache(byte *palette, int weight)
+{
+	for (int i = 0; i < 256; i++)
+		for (int j = 0 ; j < 256 ; j++)			
+//			BlendCache[i][j] = i;	// No alphablending
+//			BlendCache[i][j] = j;	// 100% translucent
+			BlendCache[i][j] = -1;	// Enable alphablending
+}
+
+
+#pragma mark -
+
+
+String::String(const char *str)
+{
+	_capacity = _len = strlen(str);
+	_str = (char *)calloc(1, _capacity+1);
+	memcpy(_str, str, _len+1);
+}
+
+String::String(const String &str)
+{
+	_capacity = str._capacity;
+	_len = str._len;
+	_str = (char *)calloc(1, _capacity+1);
+	memcpy(_str, str._str, _len+1);
+}
+
+String::~String()
+{
+	if (_str)
+		free(_str);
+}
+
+String& String::operator  =(const char* str)
+{
+	int len = strlen(str);
+	ensureCapacity(len, false);
+	
+	_len = len;
+	memcpy(_str, str, _len + 1);
+
+	return *this;
+}
+
+String& String::operator  =(const String& str)
+{
+	int len = str._len;
+	ensureCapacity(len, false);
+	
+	_len = len;
+	memcpy(_str, str._str, _len + 1);
+
+	return *this;
+}
+
+String& String::operator +=(const char* str)
+{
+	int len = strlen(str);
+	ensureCapacity(_len + len, true);
+	
+	memcpy(_str + _len, str, len + 1);
+	_len += len;
+
+	return *this;
+}
+
+String& String::operator +=(const String& str)
+{
+	int len = str._len;
+	ensureCapacity(_len + len, true);
+	
+	memcpy(_str + _len, str._str, len + 1);
+	_len += len;
+
+	return *this;
+}
+
+String& String::operator +=(char c)
+{
+	int len = _len + 1;
+	ensureCapacity(len, true);
+	
+	_str[_len++] = c;
+	_str[_len] = 0;
+
+	return *this;
+}
+
+void String::ensureCapacity(int new_len, bool keep_old)
+{
+	if (new_len <= _capacity)
+		return;
+
+	char	*old_str = _str;
+	_capacity = new_len + 32;
+	_str = (char *)calloc(1, _capacity+1);
+
+	if (old_str) {
+		if (keep_old)
+			memcpy(_str, old_str, _len+1);
+		free(old_str);
+	}
+}
+
+
+#pragma mark -
+
+
+StringList::StringList(const StringList& list)
+	: _capacity(0), _size(0), _data(0)
+{
+	printf("EEEEK! StringList copy constructor called!\n");
+	assert(0);
+}
+
+StringList::~StringList()
+{
+	if (_data)
+		free(_data);
+}
+
+
+void StringList::push_back(const char* str)
+{
+	ensureCapacity(_size + 1);
+	
+	if (!_data[_size])
+		_data[_size] = new String(str);
+	else
+		*_data[_size] = str;
+
+	_size++;
+}
+
+void StringList::push_back(const String& str)
+{
+	ensureCapacity(_size + 1);
+	
+	if (!_data[_size])
+		_data[_size] = new String(str);
+	else
+		*_data[_size] = str;
+
+	_size++;
+}
+
+
+String& StringList::operator [](int idx)
+{
+	assert(idx >= 0 && idx < _size);
+	return *_data[idx];
+}
+
+const String& StringList::operator [](int idx) const
+{
+	assert(idx >= 0 && idx < _size);
+	return *_data[idx];
+}
+
+void StringList::ensureCapacity(int new_len)
+{
+	if (new_len <= _capacity)
+		return;
+
+	String	**old_data = _data;
+	_capacity = new_len + 32;
+	_data = (String **)calloc(sizeof(String*), _capacity);
+
+	if (old_data) {
+		memcpy(_data, old_data, _size * sizeof(String*));
+		free(old_data);
+	}
+}