aboutsummaryrefslogtreecommitdiff
path: root/engines/pegasus/graphics.cpp
blob: 9431293aa13019ceb33aae035f92f15a09c03948 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/* 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.
 *
 * Additional copyright for this file:
 * Copyright (C) 1995-1997 Presto Studios, Inc.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "common/file.h"
#include "common/textconsole.h"
#include "engines/util.h"

#include "pegasus/elements.h"
#include "pegasus/graphics.h"

namespace Pegasus {

GraphicsManager::GraphicsManager(PegasusEngine *vm) : _vm(vm) {
	initGraphics(640, 480, true, NULL);

	if (_vm->_system->getScreenFormat().bytesPerPixel == 1)
		error("No true color mode available");

	// Old
	_pictDecoder = new Graphics::PictDecoder(_vm->_system->getScreenFormat());

	for (int i = 0; i < kImageCacheSize; i++)
		_cache[i].surface = 0;

	// New
	_backLayer = kMinAvailableOrder;
	_frontLayer = kMaxAvailableOrder;
	_firstDisplayElement = _lastDisplayElement = 0;
	_workArea.create(640, 480, _vm->_system->getScreenFormat());
}
	
GraphicsManager::~GraphicsManager() {
	// Old
	delete _pictDecoder;

	for (int i = 0; i < kImageCacheSize; i++) {
		if (_cache[i].surface) {
			_cache[i].surface->free();
			delete _cache[i].surface;
		}
	}

	// New
	_workArea.free();
}

Graphics::Surface *GraphicsManager::decodeImage(const Common::String &filename) {
	int imageSlot = getImageSlot(filename);

	if (_cache[imageSlot].surface)
		return _cache[imageSlot].surface;

	Common::File file;
	if (!file.open(filename))
		error("Could not open \'%s\'", filename.c_str());

	byte palette[256 * 3];
	Graphics::Surface *image = _pictDecoder->decodeImage(&file, palette);

	// For <= 8bpp, we need to convert
	if (image->format.bytesPerPixel == 1) {
		Graphics::PixelFormat format = _vm->_system->getScreenFormat();
		Graphics::Surface *output = new Graphics::Surface();
		output->create(image->w, image->h, format);

		for (uint16 y = 0; y < image->h; y++) {
			for (uint16 x = 0; x < image->w; x++) {
				byte c = *((byte *)image->getBasePtr(x, y));
				byte r = palette[c * 3];
				byte g = palette[c * 3 + 1];
				byte b = palette[c * 3 + 2];

				if (format.bytesPerPixel == 2) {
					uint16 color = format.RGBToColor(r, g, b);
					memcpy(output->getBasePtr(x, y), &color, 2);
				} else if (format.bytesPerPixel == 4) {
					uint32 color = format.RGBToColor(r, g, b);
					memcpy(output->getBasePtr(x, y), &color, 4);
				}
			}
		}

		image->free();
		delete image;
		image = output;
	}

	_cache[imageSlot].surface = image;
	return image;
}

void GraphicsManager::drawPict(Common::String filename, int x, int y, bool updateScreen) {
	Graphics::Surface *surface = decodeImage(filename);
	
	_vm->_system->copyRectToScreen((byte *)surface->pixels, surface->pitch, x, y, surface->w, surface->h);

	if (updateScreen)
		_vm->_system->updateScreen();
}

void GraphicsManager::drawPictTransparent(Common::String filename, int x, int y, uint32 transparency, bool updateScreen) {
	if (_vm->_system->getScreenFormat().bytesPerPixel == 2)
		transparency &= 0xffff;

	Graphics::Surface *surface = decodeImage(filename);
	Graphics::Surface *screen = _vm->_system->lockScreen();

	for (uint16 i = 0; i < surface->h; i++) {
		for (uint16 j = 0; j < surface->w; j++) {
			if (_vm->_system->getScreenFormat().bytesPerPixel == 2) {
				uint16 color = *((uint16 *)surface->getBasePtr(j, i));
				if (color != transparency)
					memcpy(screen->getBasePtr(j + x, i + y), &color, 2);
			} else if (_vm->_system->getScreenFormat().bytesPerPixel == 4) {
				uint32 color = *((uint32 *)surface->getBasePtr(j, i));
				if (color != transparency)
					memcpy(screen->getBasePtr(j + x, i + y), &color, 4);
			}
		}
	}

	_vm->_system->unlockScreen();

	if (updateScreen)
		_vm->_system->updateScreen();
}

uint32 GraphicsManager::getColor(byte r, byte g, byte b) {
	return _vm->_system->getScreenFormat().RGBToColor(r, g, b);
}

int GraphicsManager::getImageSlot(const Common::String &filename) {
	// Let's find a match, an open slot, or the oldest image slot
	uint32 oldestAge = 0xffffffff;
	int slot = 0;

	for (int i = 0; i < kImageCacheSize; i++) {
		if (_cache[i].filename.equalsIgnoreCase(filename)) {
			//warning("Found image %s at slot %d", filename.c_str(), i);
			_cache[i].lastUsed = _vm->_system->getMillis();
			return i;
		}

		if (!_cache[i].surface) {
			//warning("Putting image %s in empty slot %d", filename.c_str(), i);
			_cache[i].filename = filename;
			_cache[i].lastUsed = _vm->_system->getMillis();
			return i;
		}

		if (_cache[i].lastUsed < oldestAge) {
			oldestAge = _cache[i].lastUsed;
			slot = i;
		}
	}

	// Let's make sure that's cleaned out
	//warning("Replacing old image %s with %s in slot %d", _cache[slot].filename.c_str(), filename.c_str(), slot);
	_cache[slot].filename = filename;
	_cache[slot].surface->free();
	delete _cache[slot].surface;
	_cache[slot].surface = 0;
	_cache[slot].lastUsed = _vm->_system->getMillis();
	return slot;
}

void GraphicsManager::invalRect(const Common::Rect &rect) {
	// We're using a simpler algorithm for dirty rect handling than the original
	// The original was way too overcomplicated for what we need here now.

	if (_dirtyRect.width() == 0 || _dirtyRect.height() == 0) {
		// We have no dirty rect, so this is now our dirty rect
		_dirtyRect = rect;
	} else {
		// Expand our dirty rect to include rect
		_dirtyRect.extend(rect);
	}
}

void GraphicsManager::addDisplayElement(DisplayElement *newElement) {
	newElement->_elementOrder = CLIP<int>(newElement->_elementOrder, kMinAvailableOrder, kMaxAvailableOrder);

	if (_firstDisplayElement) {
		DisplayElement *runner = _firstDisplayElement;
		DisplayElement *lastRunner = 0;

		// Search for first element whose display order is greater than
		// the new element's and add the new element just before it.
		while (runner) {
			if (newElement->_elementOrder < runner->_elementOrder) {
				if (lastRunner) {
					lastRunner->_nextElement = newElement;
					newElement->_nextElement = runner;
				} else {
					newElement->_nextElement = _firstDisplayElement;
					_firstDisplayElement = newElement;
				}
				break;
			}
			lastRunner = runner;
			runner = runner->_nextElement;
		}

		// If got here and runner == NULL, we ran through the whole list without
		// inserting, so add at the end.
		if (!runner) {
			_lastDisplayElement->_nextElement = newElement;
			_lastDisplayElement = newElement;
		}
	} else {
		_firstDisplayElement = newElement;
		_lastDisplayElement = newElement;
	}

	newElement->_elementIsDisplaying = true;
}

void GraphicsManager::removeDisplayElement(DisplayElement *oldElement) {
	if (!_firstDisplayElement)
		return;

	if (oldElement == _firstDisplayElement) {
		if (oldElement == _lastDisplayElement) {
			_firstDisplayElement = 0;
			_lastDisplayElement = 0;
		} else {
			_firstDisplayElement = oldElement->_nextElement;
		}

		invalRect(oldElement->_bounds);
	} else {
		// Scan list for element.
		// If we get here, we know that the list has at least one item, and it
		// is not the first item, so we can skip it.
		DisplayElement *runner = _firstDisplayElement->_nextElement;
		DisplayElement *lastRunner = _firstDisplayElement;

		while (runner) {
			if (runner == oldElement) {
				lastRunner->_nextElement = runner->_nextElement;

				if (oldElement == _lastDisplayElement)
					_lastDisplayElement = lastRunner;

				invalRect(oldElement->_bounds);
				break;
			}

			lastRunner = runner;
			runner = runner->_nextElement;
		}
	}

	oldElement->_nextElement = 0;
	oldElement->_elementIsDisplaying = false;
}

void GraphicsManager::updateDisplay() {
	// TODO: Check for cursor move/change

	bool screenDirty = false;

	if (!_dirtyRect.isEmpty()) {
		for (DisplayElement *runner = _firstDisplayElement; runner != 0; runner = runner->_nextElement) {
			Common::Rect bounds;
			runner->getBounds(bounds);

			// TODO: Better logic; it does a bit more work than it probably needs to
			// but it should work fine for now.
			if (bounds.intersects(_dirtyRect) && runner->validToDraw(_backLayer, _frontLayer))
				runner->draw(bounds);
		}

		// Copy only the dirty rect to the screen
		g_system->copyRectToScreen((byte *)_workArea.getBasePtr(_dirtyRect.left, _dirtyRect.top), _workArea.pitch, _dirtyRect.left, _dirtyRect.top, _dirtyRect.width(), _dirtyRect.height());

		// Mark the screen as dirty
		screenDirty = true;

		// Clear the dirty rect
		_dirtyRect = Common::Rect();
	}

	if (screenDirty)
		g_system->updateScreen();
}
	
} // End of namespace Pegasus