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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 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.
*
* $URL$
* $Id$
*
*/
#include "groovie/graphics.h"
#include "groovie/groovie.h"
#include "common/system.h"
namespace Groovie {
GraphicsMan::GraphicsMan(GroovieEngine *vm) :
_vm(vm), _changed(false), _fading(0) {
// Create the game surfaces
_foreground.create(640, 320, _vm->_pixelFormat.bytesPerPixel);
_background.create(640, 320, _vm->_pixelFormat.bytesPerPixel);
}
GraphicsMan::~GraphicsMan() {
// Free the game surfaces
_foreground.free();
_background.free();
}
void GraphicsMan::update() {
if (_fading) {
// Set the start time
uint32 time = _vm->_system->getMillis() - _fadeStartTime;
// Scale the time
int step = (time * 15 << 3) / 1000;
if (step > 256) {
step = 256;
}
// Apply the current fading
applyFading(step);
// Check for the end
if (step == 256) {
_fading = 0;
// Clear the buffer when ending the fade out
if (_fading == 2)
_foreground.fillRect(Common::Rect(640, 320), 0);
}
}
// Update the screen if needed and reset the status
if (_changed) {
_vm->_system->updateScreen();
_changed = false;
}
}
void GraphicsMan::change() {
_changed = true;
}
void GraphicsMan::mergeFgAndBg() {
uint32 i;
byte *countf, *countb;
countf = (byte *)_foreground.getBasePtr(0, 0);
countb = (byte *)_background.getBasePtr(0, 0);
for (i = 640 * 320; i; i--) {
if (255 == *(countf)) {
*(countf) = *(countb);
}
countf++;
countb++;
}
}
void GraphicsMan::updateScreen(Graphics::Surface *source) {
_vm->_system->copyRectToScreen((byte *)source->getBasePtr(0, 0), 640, 0, 80, 640, 320);
change();
}
bool GraphicsMan::isFading() {
return _fading;
}
void GraphicsMan::fadeIn(byte *pal) {
// Set the start time
_fadeStartTime = _vm->_system->getMillis();
// Copy the target palette
for (int i = 0; i < 256; i++) {
_paletteFull[(i * 4) + 0] = pal[(i * 3) + 0];
_paletteFull[(i * 4) + 1] = pal[(i * 3) + 1];
_paletteFull[(i * 4) + 2] = pal[(i * 3) + 2];
}
// Set the current fading
_fading = 1;
// Apply a black palette right now
applyFading(0);
}
void GraphicsMan::fadeOut() {
// Set the start time
_fadeStartTime = _vm->_system->getMillis();
// Get the current palette
_vm->_system->grabPalette(_paletteFull, 0, 256);
// Set the current fading
_fading = 2;
}
void GraphicsMan::applyFading(int step) {
// Calculate the fade factor for the given step
int factorR = 0, factorG = 0, factorB = 0;
if (_fading == 1) {
// Fading in
factorR = (step << 2);
factorG = (step << 1);
factorB = step;
if (factorR > 256) factorR = 256;
if (factorG > 256) factorG = 256;
if (factorB > 256) factorB = 256;
} else if (_fading == 2) {
// Fading out
factorR = 256 - step;
factorG = 256 - (step << 1);
if (factorR < 0) factorR = 0;
if (factorG < 0) factorG = 0;
factorB = factorG;
}
// Calculate the new palette
byte newpal[256 * 4];
for (int i = 0; i < 256; i++) {
newpal[(i * 4) + 0] = (_paletteFull[(i * 4) + 0] * factorR) / 256;
newpal[(i * 4) + 1] = (_paletteFull[(i * 4) + 1] * factorG) / 256;
newpal[(i * 4) + 2] = (_paletteFull[(i * 4) + 2] * factorB) / 256;
}
// Set the screen palette
_vm->_system->setPalette(newpal, 0, 256);
// Request a screen update
change();
}
} // End of Groovie namespace
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