mirror of
https://github.com/libretro/scummvm.git
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149 lines
4.6 KiB
C++
149 lines
4.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/memstream.h"
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#include "common/system.h"
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#include "graphics/palette.h"
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#include "draci/draci.h"
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#include "draci/screen.h"
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#include "draci/surface.h"
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#include "draci/sprite.h"
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namespace Draci {
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Screen::Screen(DraciEngine *vm) : _vm(vm) {
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_surface = new Surface(kScreenWidth, kScreenHeight);
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_palette = new byte[3 * kNumColors];
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_blackPalette = new byte[3 * kNumColors];
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for (int i = 0; i < 3 * kNumColors; ++i) {
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_blackPalette[i] = 0;
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}
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setPalette(NULL, 0, kNumColors);
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this->clearScreen();
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}
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Screen::~Screen() {
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delete _surface;
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delete[] _palette;
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delete[] _blackPalette;
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}
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/**
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* @brief Sets a part of the palette
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* @param data Pointer to a buffer containing new palette data
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* start Index of the color where replacement should start
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* num Number of colors to replace
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*/
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void Screen::setPalette(const byte *data, uint16 start, uint16 num) {
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Common::MemoryReadStream pal(data ? data : _blackPalette, 3 * kNumColors);
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pal.seek(start * 3);
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// Copy the palette
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for (uint16 i = start; i < start + num; ++i) {
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_palette[i * 3] = pal.readByte();
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_palette[i * 3 + 1] = pal.readByte();
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_palette[i * 3 + 2] = pal.readByte();
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}
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// Shift the palette two bits to the left to make it brighter. The
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// original game only uses 6-bit colors 0..63.
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for (int i = start * 3; i < (start + num) * 3; ++i) {
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_palette[i] <<= 2;
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}
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_vm->_system->getPaletteManager()->setPalette(_palette, start, num);
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}
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void Screen::interpolatePalettes(const byte *first, const byte *second, uint16 start, uint16 num, int index, int number) {
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Common::MemoryReadStream firstPal(first ? first : _blackPalette, 3 * kNumColors);
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Common::MemoryReadStream secondPal(second ? second : _blackPalette, 3 * kNumColors);
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firstPal.seek(start * 3);
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secondPal.seek(start * 3);
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// Interpolate the palettes
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for (uint16 i = start; i < start + num; ++i) {
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_palette[i * 3] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
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_palette[i * 3 + 1] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
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_palette[i * 3 + 2] = interpolate(firstPal.readByte(), secondPal.readByte(), index, number);
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}
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// Shift the palette two bits to the left to make it brighter
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for (int i = start * 3; i < (start + num) * 3; ++i) {
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_palette[i] <<= 2;
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}
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_vm->_system->getPaletteManager()->setPalette(_palette, start, num);
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}
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int Screen::interpolate(int first, int second, int index, int number) {
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return (second * index + first * (number - index)) / number;
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}
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/**
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* @brief Copies the current memory screen buffer to the real screen
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*/
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void Screen::copyToScreen() {
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const Common::List<Common::Rect> *dirtyRects = _surface->getDirtyRects();
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Common::List<Common::Rect>::const_iterator it;
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// If a full update is needed, update the whole screen
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if (_surface->needsFullUpdate()) {
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byte *ptr = (byte *)_surface->getPixels();
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_vm->_system->copyRectToScreen(ptr, kScreenWidth,
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0, 0, kScreenWidth, kScreenHeight);
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} else {
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// Otherwise, update only the dirty rectangles
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for (it = dirtyRects->begin(); it != dirtyRects->end(); ++it) {
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// Pointer to the upper left corner of the rectangle
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byte *ptr = (byte *)_surface->getBasePtr(it->left, it->top);
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_vm->_system->copyRectToScreen(ptr, kScreenWidth,
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it->left, it->top, it->width(), it->height());
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}
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}
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// Call the "real" updateScreen and mark the surface clean
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_vm->_system->updateScreen();
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_surface->markClean();
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}
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/**
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* @brief Clears the screen
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*
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* Clears the screen and marks the whole screen dirty.
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*/
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void Screen::clearScreen() {
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byte *ptr = (byte *)_surface->getPixels();
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_surface->markDirty();
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memset(ptr, 0, kScreenWidth * kScreenHeight);
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}
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} // End of namespace Draci
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