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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 "common/memstream.h"
#include "common/system.h"
#include "draci/draci.h"
#include "draci/screen.h"
#include "draci/surface.h"
#include "draci/sprite.h"
namespace Draci {
Screen::Screen(DraciEngine *vm) : _vm(vm) {
_surface = new Surface(kScreenWidth, kScreenHeight);
_palette = new byte[3 * kNumColours];
_blackPalette = new byte[3 * kNumColours];
for (int i = 0; i < 3 * kNumColours; ++i) {
_blackPalette[i] = 0;
}
setPalette(NULL, 0, kNumColours);
this->clearScreen();
}
Screen::~Screen() {
delete _surface;
delete[] _palette;
delete[] _blackPalette;
}
/**
* @brief Sets a part of the palette
* @param data Pointer to a buffer containing new palette data
* start Index of the colour where replacement should start
* num Number of colours to replace
*/
void Screen::setPalette(const byte *data, uint16 start, uint16 num) {
Common::MemoryReadStream pal(data ? data : _blackPalette, 3 * kNumColours);
pal.seek(start * 3);
// Copy the palette
for (uint16 i = start; i < start + num; ++i) {
_palette[i * 3] = pal.readByte();
_palette[i * 3 + 1] = pal.readByte();
_palette[i * 3 + 2] = pal.readByte();
}
// Shift the palette two bits to the left to make it brighter. The
// original game only uses 6-bit colors 0..63.
for (int i = start * 3; i < (start + num) * 3; ++i) {
_palette[i] <<= 2;
}
_vm->_system->getPaletteManager()->setPalette(_palette, start, num);
}
void Screen::interpolatePalettes(const byte *first, const byte *second, uint16 start, uint16 num, int index, int number) {
Common::MemoryReadStream firstPal(first ? first : _blackPalette, 3 * kNumColours);
Common::MemoryReadStream secondPal(second ? second : _blackPalette, 3 * kNumColours);
firstPal.seek(start * 3);
secondPal.seek(start * 3);
// Interpolate the palettes
for (uint16 i = start; i < start + num; ++i) {
_palette[i * 3] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
_palette[i * 3 + 1] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
_palette[i * 3 + 2] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
}
// Shift the palette two bits to the left to make it brighter
for (int i = start * 3; i < (start + num) * 3; ++i) {
_palette[i] <<= 2;
}
_vm->_system->getPaletteManager()->setPalette(_palette, start, num);
}
int Screen::interpolate(int first, int second, int index, int number) {
return (second * index + first * (number - index)) / number;
}
/**
* @brief Copies the current memory screen buffer to the real screen
*/
void Screen::copyToScreen() {
const Common::List<Common::Rect> *dirtyRects = _surface->getDirtyRects();
Common::List<Common::Rect>::const_iterator it;
// If a full update is needed, update the whole screen
if (_surface->needsFullUpdate()) {
byte *ptr = (byte *)_surface->getBasePtr(0, 0);
_vm->_system->copyRectToScreen(ptr, kScreenWidth,
0, 0, kScreenWidth, kScreenHeight);
} else {
// Otherwise, update only the dirty rectangles
for (it = dirtyRects->begin(); it != dirtyRects->end(); ++it) {
// Pointer to the upper left corner of the rectangle
byte *ptr = (byte *)_surface->getBasePtr(it->left, it->top);
_vm->_system->copyRectToScreen(ptr, kScreenWidth,
it->left, it->top, it->width(), it->height());
}
}
// Call the "real" updateScreen and mark the surface clean
_vm->_system->updateScreen();
_surface->markClean();
}
/**
* @brief Clears the screen
*
* Clears the screen and marks the whole screen dirty.
*/
void Screen::clearScreen() {
byte *ptr = (byte *)_surface->getBasePtr(0, 0);
_surface->markDirty();
memset(ptr, 0, kScreenWidth * kScreenHeight);
}
} // End of namespace Draci
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