mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-21 01:08:25 +00:00
360 lines
7.6 KiB
C++
360 lines
7.6 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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* $URL$
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* $Id$
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*
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*/
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#include "kyra/screen_v2.h"
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#include "common/endian.h"
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namespace Kyra {
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Screen_v2::Screen_v2(KyraEngine_v1 *vm, OSystem *system) : Screen(vm, system), _wsaFrameAnimBuffer(0) {
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_wsaFrameAnimBuffer = new uint8[1024];
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assert(_wsaFrameAnimBuffer);
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}
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Screen_v2::~Screen_v2() {
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delete[] _wsaFrameAnimBuffer;
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}
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uint8 *Screen_v2::generateOverlay(const Palette &pal, uint8 *buffer, int startColor, uint16 factor) {
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if (!buffer)
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return buffer;
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factor = MIN<uint16>(255, factor);
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factor >>= 1;
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factor &= 0xFF;
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const byte col1 = pal[startColor * 3 + 0];
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const byte col2 = pal[startColor * 3 + 1];
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const byte col3 = pal[startColor * 3 + 2];
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uint8 *dst = buffer;
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*dst++ = 0;
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for (int i = 1; i != 255; ++i) {
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uint8 processedPalette[3];
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byte col;
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col = pal[i * 3 + 0];
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col -= ((((col - col1) * factor) << 1) >> 8) & 0xFF;
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processedPalette[0] = col;
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col = pal[i * 3 + 1];
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col -= ((((col - col2) * factor) << 1) >> 8) & 0xFF;
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processedPalette[1] = col;
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col = pal[i * 3 + 2];
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col -= ((((col - col3) * factor) << 1) >> 8) & 0xFF;
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processedPalette[2] = col;
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*dst++ = findLeastDifferentColor(processedPalette, pal, 1, 255) + 1;
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}
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return buffer;
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}
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void Screen_v2::applyOverlay(int x, int y, int w, int h, int pageNum, const uint8 *overlay) {
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if (pageNum == 0 || pageNum == 1)
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addDirtyRect(x, y, w, h);
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uint8 *dst = getPagePtr(pageNum) + y * 320 + x;
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while (h--) {
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for (int wi = 0; wi < w; ++wi) {
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uint8 index = *dst;
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*dst++ = overlay[index];
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}
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dst += 320 - w;
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}
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}
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int Screen_v2::findLeastDifferentColor(const uint8 *paletteEntry, const Palette &pal, uint8 firstColor, uint16 numColors, bool skipSpecialColors) {
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int m = 0x7fff;
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int r = 0x101;
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for (int i = 0; i < numColors; i++) {
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if (skipSpecialColors && i >= 0xc0 && i <= 0xc3)
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continue;
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int v = paletteEntry[0] - pal[(i + firstColor) * 3 + 0];
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int c = v * v;
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v = paletteEntry[1] - pal[(i + firstColor) * 3 + 1];
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c += (v * v);
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v = paletteEntry[2] - pal[(i + firstColor) * 3 + 2];
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c += (v * v);
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if (c <= m) {
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m = c;
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r = i;
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}
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}
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return r;
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}
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void Screen_v2::getFadeParams(const Palette &pal, int delay, int &delayInc, int &diff) {
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int maxDiff = 0;
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diff = 0;
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for (int i = 0; i < pal.getNumColors() * 3; ++i) {
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diff = ABS(pal[i] - (*_screenPalette)[i]);
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maxDiff = MAX(maxDiff, diff);
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}
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delayInc = delay << 8;
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if (maxDiff != 0) {
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delayInc /= maxDiff;
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delayInc = MIN(delayInc, 0x7FFF);
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}
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delay = delayInc;
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for (diff = 1; diff <= maxDiff; ++diff) {
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if (delayInc >= 256)
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break;
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delayInc += delay;
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}
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}
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const uint8 *Screen_v2::getPtrToShape(const uint8 *shpFile, int shape) {
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uint16 shapes = READ_LE_UINT16(shpFile);
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if (shapes <= shape)
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return 0;
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uint32 offset = READ_LE_UINT32(shpFile + (shape << 2) + 2);
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return shpFile + offset + 2;
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}
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uint8 *Screen_v2::getPtrToShape(uint8 *shpFile, int shape) {
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uint16 shapes = READ_LE_UINT16(shpFile);
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if (shapes <= shape)
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return 0;
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uint32 offset = READ_LE_UINT32(shpFile + (shape << 2) + 2);
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return shpFile + offset + 2;
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}
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int Screen_v2::getShapeScaledWidth(const uint8 *shpFile, int scale) {
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int width = READ_LE_UINT16(shpFile+3);
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return (width * scale) >> 8;
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}
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int Screen_v2::getShapeScaledHeight(const uint8 *shpFile, int scale) {
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int height = shpFile[2];
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return (height * scale) >> 8;
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}
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uint16 Screen_v2::getShapeSize(const uint8 *shp) {
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return READ_LE_UINT16(shp+6);
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}
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uint8 *Screen_v2::makeShapeCopy(const uint8 *src, int index) {
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const uint8 *shape = getPtrToShape(src, index);
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if (!shape)
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return 0;
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int size = getShapeSize(shape);
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uint8 *copy = new uint8[size];
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assert(copy);
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memcpy(copy, shape, size);
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return copy;
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}
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int Screen_v2::getLayer(int x, int y) {
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if (x < 0)
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x = 0;
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else if (x >= 320)
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x = 319;
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if (y < 0)
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y = 0;
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else if (y >= 144)
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y = 143;
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uint8 pixel = *(getCPagePtr(5) + y * 320 + x);
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pixel &= 0x7F;
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pixel >>= 3;
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if (pixel < 1)
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pixel = 1;
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else if (pixel > 15)
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pixel = 15;
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return pixel;
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}
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int Screen_v2::getRectSize(int w, int h) {
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if (w > 320 || h > 200)
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return 0;
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return w*h;
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}
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void Screen_v2::setTextColorMap(const uint8 *cmap) {
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setTextColor(cmap, 0, 15);
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}
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void Screen_v2::wsaFrameAnimationStep(int x1, int y1, int x2, int y2,
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int w1, int h1, int w2, int h2, int srcPage, int dstPage, int dim) {
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if (!(w1 || h1 || w2 || h2))
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return;
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ScreenDim cdm = *getScreenDim(dim);
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cdm.sx <<= 3;
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cdm.w <<= 3;
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int na = 0, nb = 0, nc = w2;
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if (!calcBounds(cdm.w, cdm.h, x2, y2, w2, h2, na, nb, nc))
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return;
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const uint8 *src = getPagePtr(srcPage) + y1 * 320;
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uint8 *dst = getPagePtr(dstPage) + (y2 + cdm.sy) * 320;
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int u = -1;
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do {
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int t = (nb * h1) / h2;
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if (t != u) {
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u = t;
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const uint8 *s = src + x1 + t * 320;
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uint8 *dt = (uint8 *)_wsaFrameAnimBuffer;
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t = w2 - w1;
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if (!t) {
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memcpy(dt, s, w2);
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} else if (t > 0) {
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if (w1 == 1) {
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memset(dt, *s, w2);
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} else {
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t = ((((((w2 - w1 + 1) & 0xffff) << 8) / w1) + 0x100) & 0xffff) << 8;
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int bp = 0;
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for (int i = 0; i < w1; i++) {
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int cnt = (t >> 16);
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bp += (t & 0xffff);
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if (bp > 0xffff) {
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bp -= 0xffff;
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cnt++;
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}
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memset(dt, *s++, cnt);
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dt += cnt;
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}
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}
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} else {
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if (w2 == 1) {
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*dt = *s;
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} else {
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t = (((((w1 - w2) & 0xffff) << 8) / w2) & 0xffff) << 8;
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int bp = 0;
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for (int i = 0; i < w2; i++) {
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*dt++ = *s++;
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bp += (t & 0xffff);
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if (bp > 0xffff) {
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bp -= 0xffff;
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s++;
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}
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s += (t >> 16);
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}
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}
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}
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}
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memcpy(dst + x2 + cdm.sx, _wsaFrameAnimBuffer + na, w2);
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dst += 320;
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} while (++nb < h2);
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if (!dstPage)
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addDirtyRect(x2, y2, w2, h2);
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}
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bool Screen_v2::calcBounds(int w0, int h0, int &x1, int &y1, int &w1, int &h1, int &x2, int &y2, int &w2) {
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x2 = 0;
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y2 = 0;
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w2 = w1;
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int t = x1 + w1;
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if (t < 1) {
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w1 = h1 = -1;
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} else {
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if (t <= x1) {
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x2 = w1 - t;
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w1 = t;
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x1 = 0;
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}
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t = w0 - x1;
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if (t < 1) {
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w1 = h1 = -1;
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} else {
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if (t <= w1) {
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w1 = t;
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}
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w2 -= w1;
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t = h1 + y1;
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if (t < 1) {
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w1 = h1 = -1;
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} else {
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if (t <= y1) {
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y2 = h1 - t;
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h1 = t;
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y1 = 0;
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}
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t = h0 - y1;
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if (t < 1) {
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w1 = h1 = -1;
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} else {
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if (t <= h1) {
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h1 = t;
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}
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}
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}
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}
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}
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return (w1 == -1) ? false : true;
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}
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void Screen_v2::checkedPageUpdate(int srcPage, int dstPage) {
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const uint32 *src = (const uint32 *)getPagePtr(srcPage);
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uint32 *dst = (uint32 *)getPagePtr(dstPage);
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uint32 *page0 = (uint32 *)getPagePtr(0);
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bool updated = false;
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for (int y = 0; y < 200; ++y) {
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for (int x = 0; x < 80; ++x, ++src, ++dst, ++page0) {
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if (*src != *dst) {
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updated = true;
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*dst = *page0 = *src;
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}
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}
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}
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if (updated)
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addDirtyRect(0, 0, 320, 200);
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}
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} // End of namespace Kyra
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