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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.
*
*/
#include "sherlock/screen.h"
#include "sherlock/sherlock.h"
#include "common/system.h"
#include "graphics/palette.h"
namespace Sherlock {
Screen::Screen(SherlockEngine *vm) : Surface(SHERLOCK_SCREEN_WIDTH, SHERLOCK_SCREEN_HEIGHT), _vm(vm),
_backBuffer(SHERLOCK_SCREEN_WIDTH, SHERLOCK_SCREEN_HEIGHT),
_backBuffer2(SHERLOCK_SCREEN_WIDTH, SHERLOCK_SCREEN_HEIGHT) {
_transitionSeed = 1;
_fadeStyle = false;
Common::fill(&_cMap[0], &_cMap[PALETTE_SIZE], 0);
Common::fill(&_sMap[0], &_sMap[PALETTE_SIZE], 0);
setFont(1);
}
void Screen::setFont(int fontNumber) {
_fontNumber = fontNumber;
Common::String fname = Common::String::format("FONT%d.VGS", fontNumber);
Common::SeekableReadStream *stream = _vm->_res->load(fname);
debug("TODO: Loading font %s, size - %d", fname.c_str(), stream->size());
delete stream;
}
void Screen::update() {
// Merge the dirty rects
mergeDirtyRects();
// Loop through copying dirty areas to the physical screen
Common::List<Common::Rect>::iterator i;
for (i = _dirtyRects.begin(); i != _dirtyRects.end(); ++i) {
const Common::Rect &r = *i;
const byte *srcP = (const byte *)getBasePtr(r.left, r.top);
g_system->copyRectToScreen(srcP, this->pitch, r.left, r.top,
r.width(), r.height());
}
// Signal the physical screen to update
g_system->updateScreen();
_dirtyRects.clear();
}
void Screen::getPalette(byte palette[PALETTE_SIZE]) {
g_system->getPaletteManager()->grabPalette(palette, 0, PALETTE_COUNT);
}
void Screen::setPalette(const byte palette[PALETTE_SIZE]) {
g_system->getPaletteManager()->setPalette(palette, 0, PALETTE_COUNT);
}
int Screen::equalizePalette(const byte palette[PALETTE_SIZE]) {
int total = 0;
byte tempPalette[PALETTE_SIZE];
getPalette(tempPalette);
// For any palette component that doesn't already match the given destination
// palette, change by 1 towards the reference palette component
for (int idx = 0; idx < PALETTE_SIZE; ++idx) {
if (tempPalette[idx] > palette[idx])
{
tempPalette[idx] = MAX((int)palette[idx], (int)tempPalette[idx] - 4);
++total;
} else if (tempPalette[idx] < palette[idx]) {
tempPalette[idx] = MIN((int)palette[idx], (int)tempPalette[idx] + 4);
++total;
}
}
if (total > 0)
// Palette changed, so reload it
setPalette(tempPalette);
return total;
}
/**
* Fade out the palette to black
*/
void Screen::fadeToBlack(int speed) {
byte tempPalette[PALETTE_SIZE];
Common::fill(&tempPalette[0], &tempPalette[PALETTE_SIZE], 0);
while (equalizePalette(tempPalette)) {
_vm->_events->delay(15 * speed);
}
setPalette(tempPalette);
}
/**
* Fade in a given palette
*/
void Screen::fadeIn(const byte palette[PALETTE_SIZE], int speed) {
int count = 50;
while (equalizePalette(palette) && --count) {
_vm->_events->delay(15 * speed);
}
setPalette(palette);
}
/**
* Adds a rectangle to the list of modified areas of the screen during the
* current frame
*/
void Screen::addDirtyRect(const Common::Rect &r) {
_dirtyRects.push_back(r);
assert(r.isValidRect() && r.width() > 0 && r.height() > 0);
}
/**
* Merges together overlapping dirty areas of the screen
*/
void Screen::mergeDirtyRects() {
Common::List<Common::Rect>::iterator rOuter, rInner;
// Ensure dirty rect list has at least two entries
rOuter = _dirtyRects.begin();
for (int i = 0; i < 2; ++i, ++rOuter) {
if (rOuter == _dirtyRects.end())
return;
}
// Process the dirty rect list to find any rects to merge
for (rOuter = _dirtyRects.begin(); rOuter != _dirtyRects.end(); ++rOuter) {
rInner = rOuter;
while (++rInner != _dirtyRects.end()) {
if ((*rOuter).intersects(*rInner)) {
// these two rectangles overlap or
// are next to each other - merge them
unionRectangle(*rOuter, *rOuter, *rInner);
// remove the inner rect from the list
_dirtyRects.erase(rInner);
// move back to beginning of list
rInner = rOuter;
}
}
}
}
/**
* Returns the union of two dirty area rectangles
*/
bool Screen::unionRectangle(Common::Rect &destRect, const Common::Rect &src1, const Common::Rect &src2) {
destRect = src1;
destRect.extend(src2);
return !destRect.isEmpty();
}
/**
* Do a random pixel transition in from _backBuffer surface to the screen
*/
void Screen::randomTransition() {
EventsManager &events = *_vm->_events;
const int TRANSITION_MULTIPLIER = 0x15a4e35;
_dirtyRects.clear();
for (int idx = 0; idx <= 65535; ++idx) {
_transitionSeed = _transitionSeed * TRANSITION_MULTIPLIER + 1;
int offset = _transitionSeed & 65535;
if (offset < (SHERLOCK_SCREEN_WIDTH * SHERLOCK_SCREEN_HEIGHT))
*((byte *)getPixels() + offset) = *((const byte *)_backBuffer.getPixels() + offset);
if (idx != 0 && (idx % 100) == 0) {
// Ensure there's a full screen dirty rect for the next frame update
if (_dirtyRects.empty())
addDirtyRect(Common::Rect(0, 0, this->w, this->h));
events.pollEvents();
events.delay(1);
}
}
// Make sure everything has been transferred
blitFrom(_backBuffer);
}
/**
* Transition to the surface from _backBuffer using a vertical transition
*/
void Screen::verticalTransition() {
EventsManager &events = *_vm->_events;
byte table[SHERLOCK_SCREEN_WIDTH];
Common::fill(&table[0], &table[SHERLOCK_SCREEN_WIDTH], 0);
for (int yp = 0; yp < SHERLOCK_SCREEN_HEIGHT; ++yp) {
for (int xp = 0; xp < SHERLOCK_SCREEN_WIDTH; ++xp) {
int temp = (table[xp] >= 197) ? SHERLOCK_SCREEN_HEIGHT - table[xp] :
_vm->getRandomNumber(3) + 1;
if (temp) {
blitFrom(_backBuffer, Common::Point(xp, table[xp]),
Common::Rect(xp, table[xp], xp + 1, table[xp] + temp));
table[xp] += temp;
}
}
events.delay(10);
}
}
} // End of namespace Sherlock
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