/
graphics.cpp
1138 lines (958 loc) · 26.2 KB
/
graphics.cpp
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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 "common/endian.h"
#include "common/system.h"
#include "graphics/palette.h"
#include "mortevielle/graphics.h"
#include "mortevielle/mortevielle.h"
#include "mortevielle/mouse.h"
#include "mortevielle/var_mor.h"
namespace Mortevielle {
/*-------------------------------------------------------------------------*
* Palette Manager
*
*-------------------------------------------------------------------------*/
/**
* Set palette entries from the 64 colour available EGA palette
*/
void PaletteManager::setPalette(const int *palette, uint idx, uint size) {
assert((idx + size) <= 16);
// Build up the EGA palette
byte egaPalette[64 * 3];
byte *p = &egaPalette[0];
for (int i = 0; i < 64; ++i) {
*p++ = (i >> 2 & 1) * 0xaa + (i >> 5 & 1) * 0x55;
*p++ = (i >> 1 & 1) * 0xaa + (i >> 4 & 1) * 0x55;
*p++ = (i & 1) * 0xaa + (i >> 3 & 1) * 0x55;
}
// Loop through setting palette colours based on the passed indexes
for (; size > 0; --size, ++idx) {
int palIndex = palette[idx];
assert(palIndex < 64);
const byte *pRgb = (const byte *)&egaPalette[palIndex * 3];
g_system->getPaletteManager()->setPalette(pRgb, idx, 1);
}
}
/**
* Set the default EGA palette
*/
void PaletteManager::setDefaultPalette() {
int defaultPalette[16] = { 0, 1, 2, 3, 4, 5, 20, 7, 56, 57, 58, 59, 60, 61, 62, 63 };
setPalette(defaultPalette, 0, 16);
}
/*-------------------------------------------------------------------------*
* Image decoding
*
* The code in this section is responsible for decoding image resources.
* Images are broken down into rectangular sections, which can use one
* of 18 different encoding methods.
*-------------------------------------------------------------------------*/
#define INCR_TAIX { if (_xSize & 1) ++_xSize; }
#define DEFAULT_WIDTH (SCREEN_WIDTH / 2)
#define BUFFER_SIZE 40000
void GfxSurface::decode(const byte *pSrc) {
_width = _height = 0;
bool offsetFlag = *pSrc++ == 0;
int entryCount = *pSrc++;
pSrc += 2;
if (offsetFlag)
pSrc += 30;
// First run through the data to calculate starting offsets
const byte *p = pSrc;
_offset.x = _offset.y = 999;
assert(entryCount > 0);
for (int idx = 0; idx < entryCount; ++idx) {
_xp = READ_BE_UINT16(p + 4);
if (_xp < _offset.x)
_offset.x = _xp;
_yp = READ_BE_UINT16(p + 6);
if (_yp < _offset.y)
_offset.y = _yp;
// Move to next entry
int size = READ_BE_UINT16(p) + READ_BE_UINT16(p + 2);
if ((size % 2) == 1)
++size;
p += size + 14;
}
// Temporary output buffer
byte outputBuffer[65536];
Common::fill(&outputBuffer[0], &outputBuffer[65536], 0);
byte *pDest = &outputBuffer[0];
const byte *pSrcStart = pSrc;
const byte *pLookup = NULL;
byte lookupTable[BUFFER_SIZE];
byte srcBuffer[BUFFER_SIZE];
// Main processing loop
for (int entryIndex = 0; entryIndex < entryCount; ++entryIndex) {
int lookupBytes = READ_BE_UINT16(pSrc);
int srcSize = READ_BE_UINT16(pSrc + 2);
_xp = READ_BE_UINT16(pSrc + 4) - _offset.x;
_yp = READ_BE_UINT16(pSrc + 6) - _offset.y;
assert((_xp >= 0) && (_yp >= 0) && (_xp < SCREEN_WIDTH) && (_yp < SCREEN_ORIG_HEIGHT));
pSrc += 8;
int decomCode = READ_BE_UINT16(pSrc);
_xSize = READ_BE_UINT16(pSrc + 2) + 1;
_ySize = READ_BE_UINT16(pSrc + 4) + 1;
majTtxTty();
pSrc += 6;
pDest = &outputBuffer[0];
_lookupIndex = 0;
_nibbleFlag = false;
int decomIndex = 0;
if (decomCode >> 8) {
// Build up reference table
int tableOffset = 0;
if (decomCode & 1) {
// Handle decompression of the pattern lookup table
do {
int outerCount = desanalyse(pSrc);
int innerCount = desanalyse(pSrc);
const byte *pSrcSaved = pSrc;
bool savedNibbleFlag = _nibbleFlag;
int savedLookupIndex = _lookupIndex;
do {
pSrc = pSrcSaved;
_nibbleFlag = savedNibbleFlag;
_lookupIndex = savedLookupIndex;
for (int idx = 0; idx < innerCount; ++idx, ++tableOffset) {
assert(tableOffset < BUFFER_SIZE);
lookupTable[tableOffset] = suiv(pSrc);
}
} while (--outerCount > 0);
} while (_lookupIndex < (lookupBytes - 1));
} else {
assert(lookupBytes < BUFFER_SIZE);
for (int idx = 0; idx < (lookupBytes * 2); ++idx)
lookupTable[idx] = suiv(pSrc);
}
if (_nibbleFlag) {
++pSrc;
_nibbleFlag = false;
}
if ((lookupBytes + srcSize) & 1)
++pSrc;
tableOffset = 0;
_lookupIndex = 0;
if (decomCode & 2) {
// Handle decompression of the temporary source buffer
do {
int outerCount = desanalyse(pSrc);
int innerCount = desanalyse(pSrc);
_lookupIndex += innerCount;
if (_nibbleFlag) {
++pSrc;
++_lookupIndex;
_nibbleFlag = false;
}
const byte *pStart = pSrc;
do {
pSrc = pStart;
for (int idx = 0; idx < innerCount; ++idx) {
assert(tableOffset < BUFFER_SIZE);
srcBuffer[tableOffset++] = *pSrc++;
}
} while (--outerCount > 0);
} while (_lookupIndex < (srcSize - 1));
} else {
assert(srcSize < BUFFER_SIZE);
for (int idx = 0; idx < srcSize; ++idx)
srcBuffer[idx] = *pSrc++;
}
if (_nibbleFlag)
++pSrc;
// Switch over to using the decompressed source and lookup buffers
pSrcStart = pSrc;
pDest = &outputBuffer[_yp * DEFAULT_WIDTH + _xp];
pSrc = &srcBuffer[0];
pLookup = &lookupTable[0] - 1;
_lookupValue = _lookupIndex = 0;
_nibbleFlag = false;
decomIndex = decomCode >> 8;
}
// Main decompression switch
switch (decomIndex) {
case 0:
// Draw rect at pos
pDest = &outputBuffer[_yp * DEFAULT_WIDTH + _xp];
pSrcStart = pSrc;
INCR_TAIX;
for (int yCtr = 0; yCtr < _ySize; ++yCtr, pDest += DEFAULT_WIDTH) {
byte *pDestLine = pDest;
for (int xCtr = 0; xCtr < _xSize; ++xCtr) {
*pDestLine++ = suiv(pSrc);
}
}
pSrcStart += lookupBytes + ((lookupBytes & 1) ? 1 : 0);
break;
case 1:
// Draw rect using horizontal lines alternating left to right, then right to left
INCR_TAIX;
for (int yCtr = 0; yCtr < _ySize; ++yCtr) {
if ((yCtr % 2) == 0) {
for (int xCtr = 0; xCtr < _xSize; ++xCtr) {
*pDest++ = csuiv(pSrc, pLookup);
}
} else {
for (int xCtr = 0; xCtr < _xSize; ++xCtr) {
*--pDest = csuiv(pSrc, pLookup);
}
}
pDest += DEFAULT_WIDTH;
}
break;
case 2:
// Draw rect alternating top to bottom, bottom to top
for (int xCtr = 0; xCtr < _xSize; ++xCtr) {
if ((xCtr % 2) == 0) {
for (int yCtr = 0; yCtr < _ySize; ++yCtr, pDest += DEFAULT_WIDTH) {
*pDest = csuiv(pSrc, pLookup);
}
} else {
for (int yCtr = 0; yCtr < _ySize; ++yCtr) {
pDest -= DEFAULT_WIDTH;
*pDest = csuiv(pSrc, pLookup);
}
}
++pDest;
}
break;
case 3:
// Draw horizontal area?
_thickness = 2;
horizontal(pSrc, pDest, pLookup);
break;
case 4:
// Draw vertical area?
_thickness = 2;
vertical(pSrc, pDest, pLookup);
break;
case 5:
_thickness = 3;
horizontal(pSrc, pDest, pLookup);
break;
case 6:
_thickness = 4;
vertical(pSrc, pDest, pLookup);
break;
case 7:
// Draw rect using horizontal lines left to right
INCR_TAIX;
for (int yCtr = 0; yCtr < _ySize; ++yCtr, pDest += DEFAULT_WIDTH) {
byte *pDestLine = pDest;
for (int xCtr = 0; xCtr < _xSize; ++xCtr)
*pDestLine++ = csuiv(pSrc, pLookup);
}
break;
case 8:
// Draw box
for (int xCtr = 0; xCtr < _xSize; ++xCtr, ++pDest) {
byte *pDestLine = pDest;
for (int yCtr = 0; yCtr < _ySize; ++yCtr, pDestLine += DEFAULT_WIDTH)
*pDestLine = csuiv(pSrc, pLookup);
}
break;
case 9:
_thickness = 4;
horizontal(pSrc, pDest, pLookup);
break;
case 10:
_thickness = 6;
horizontal(pSrc, pDest, pLookup);
break;
case 11:
decom11(pSrc, pDest, pLookup);
break;
case 12:
INCR_TAIX;
_thickness = _xInc = 1;
_yInc = DEFAULT_WIDTH;
_yEnd = _ySize;
_xEnd = _xSize;
diag(pSrc, pDest, pLookup);
break;
case 13:
INCR_TAIX;
_thickness = _xSize;
_yInc = 1;
_yEnd = _xSize;
_xInc = DEFAULT_WIDTH;
_xEnd = _ySize;
diag(pSrc, pDest, pLookup);
break;
case 14:
_thickness = _yInc = 1;
_yEnd = _xSize;
_xInc = DEFAULT_WIDTH;
_xEnd = _ySize;
diag(pSrc, pDest, pLookup);
break;
case 15:
INCR_TAIX;
_thickness = 2;
_yInc = DEFAULT_WIDTH;
_yEnd = _ySize;
_xInc = 1;
_xEnd = _xSize;
diag(pSrc, pDest, pLookup);
break;
case 16:
_thickness = 3;
_yInc = 1;
_yEnd = _xSize;
_xInc = DEFAULT_WIDTH;
_xEnd = _ySize;
diag(pSrc, pDest, pLookup);
break;
case 17:
INCR_TAIX;
_thickness = 3;
_yInc = DEFAULT_WIDTH;
_yEnd = _ySize;
_xInc = 1;
_xEnd = _xSize;
diag(pSrc, pDest, pLookup);
break;
case 18:
INCR_TAIX;
_thickness = 5;
_yInc = DEFAULT_WIDTH;
_yEnd = _ySize;
_xInc = 1;
_xEnd = _xSize;
diag(pSrc, pDest, pLookup);
break;
default:
error("Unknown decompression block type %d", decomIndex);
}
pSrc = pSrcStart;
debugC(2, kMortevielleGraphics, "Decoding image block %d position %d,%d size %d,%d method %d",
entryIndex + 1, _xp, _yp, _width, _height, decomIndex);
}
// At this point, the outputBuffer has the data for the image. Initialise the surface
// with the calculated size, and copy the lines to the surface
create(_width, _height, Graphics::PixelFormat::createFormatCLUT8());
for (int yCtr = 0; yCtr < _height; ++yCtr) {
const byte *copySrc = &outputBuffer[yCtr * DEFAULT_WIDTH];
byte *copyDest = (byte *)getBasePtr(0, yCtr);
Common::copy(copySrc, copySrc + _width, copyDest);
}
}
void GfxSurface::majTtxTty() {
if (!_yp)
_width += _xSize;
if (!_xp)
_height += _ySize;
}
byte GfxSurface::suiv(const byte *&pSrc) {
int v = *pSrc;
if (_nibbleFlag) {
++pSrc;
++_lookupIndex;
_nibbleFlag = false;
return v & 0xf;
} else {
_nibbleFlag = !_nibbleFlag;
return v >> 4;
}
}
byte GfxSurface::csuiv(const byte *&pSrc, const byte *&pLookup) {
assert(pLookup);
while (!_lookupValue) {
int v;
do {
v = suiv(pSrc) & 0xff;
_lookupValue += v;
} while (v == 0xf);
++pLookup;
}
--_lookupValue;
return *pLookup;
}
int GfxSurface::desanalyse(const byte *&pSrc) {
int total = 0;
int v = suiv(pSrc);
if (v == 15) {
int v2;
do {
v2 = suiv(pSrc);
total += v2;
} while (v2 == 15);
total *= 15;
v = suiv(pSrc);
}
total += v;
return total;
}
void GfxSurface::horizontal(const byte *&pSrc, byte *&pDest, const byte *&pLookup) {
INCR_TAIX;
byte *pDestEnd = pDest + (_ySize - 1) * DEFAULT_WIDTH + _xSize;
for (;;) {
// If position is past end point, then skip this line
if (((_thickness - 1) * DEFAULT_WIDTH) + pDest >= pDestEnd) {
if (--_thickness == 0)
break;
continue;
}
bool continueFlag = false;
do {
for (int xIndex = 0; xIndex < _xSize; ++xIndex) {
if ((xIndex % 2) == 0) {
if (xIndex != 0)
++pDest;
// Write out vertical slice top to bottom
for (int yIndex = 0; yIndex < _thickness; ++yIndex, pDest += DEFAULT_WIDTH)
*pDest = csuiv(pSrc, pLookup);
++pDest;
} else {
// Write out vertical slice bottom to top
for (int yIndex = 0; yIndex < _thickness; ++yIndex) {
pDest -= DEFAULT_WIDTH;
*pDest = csuiv(pSrc, pLookup);
}
}
}
if ((_xSize % 2) == 0) {
int blockSize = _thickness * DEFAULT_WIDTH;
pDest += blockSize;
blockSize -= DEFAULT_WIDTH;
if (pDestEnd < (pDest + blockSize)) {
do {
if (--_thickness == 0)
return;
} while ((pDest + (_thickness - 1) * DEFAULT_WIDTH) >= pDestEnd);
}
} else {
while ((pDest + (_thickness - 1) * DEFAULT_WIDTH) >= pDestEnd) {
if (--_thickness == 0)
return;
}
}
for (int xIndex = 0; xIndex < _xSize; ++xIndex, --pDest) {
if ((xIndex % 2) == 0) {
// Write out vertical slice top to bottom
for (int yIndex = 0; yIndex < _thickness; ++yIndex, pDest += DEFAULT_WIDTH)
*pDest = csuiv(pSrc, pLookup);
} else {
// Write out vertical slice top to bottom
for (int yIndex = 0; yIndex < _thickness; ++yIndex) {
pDest -= DEFAULT_WIDTH;
*pDest = csuiv(pSrc, pLookup);
}
}
}
if ((_xSize % 2) == 1) {
++pDest;
if ((pDest + (_thickness - 1) * DEFAULT_WIDTH) < pDestEnd) {
continueFlag = true;
break;
}
} else {
pDest += _thickness * DEFAULT_WIDTH + 1;
continueFlag = true;
break;
}
++pDest;
} while (((_thickness - 1) * DEFAULT_WIDTH + pDest) < pDestEnd);
if (continueFlag)
continue;
// Move to next line
if (--_thickness == 0)
break;
}
}
void GfxSurface::vertical(const byte *&pSrc, byte *&pDest, const byte *&pLookup) {
int drawIndex = 0;
for (;;) {
// Reduce thickness as necessary
while ((drawIndex + _thickness) > _xSize) {
if (--_thickness == 0)
return;
}
// Loop
for (int yCtr = 0; yCtr < _ySize; ++yCtr) {
if ((yCtr % 2) == 0) {
if (yCtr > 0)
pDest += DEFAULT_WIDTH;
drawIndex += _thickness;
for (int xCtr = 0; xCtr < _thickness; ++xCtr)
*pDest++ = csuiv(pSrc, pLookup);
} else {
pDest += DEFAULT_WIDTH;
drawIndex -= _thickness;
for (int xCtr = 0; xCtr < _thickness; ++xCtr)
*--pDest = csuiv(pSrc, pLookup);
}
}
if ((_ySize % 2) == 0) {
pDest += _thickness;
drawIndex += _thickness;
}
while (_xSize < (drawIndex + _thickness)) {
if (--_thickness == 0)
return;
}
// Loop
for (int yCtr = 0; yCtr < _ySize; ++yCtr) {
if ((yCtr % 2) == 0) {
if (yCtr > 0)
pDest -= DEFAULT_WIDTH;
drawIndex += _thickness;
for (int xCtr = 0; xCtr < _thickness; ++xCtr)
*pDest++ = csuiv(pSrc, pLookup);
} else {
pDest -= DEFAULT_WIDTH;
drawIndex -= _thickness;
for (int xCtr = 0; xCtr < _thickness; ++xCtr)
*--pDest = csuiv(pSrc, pLookup);
}
}
if ((_ySize % 2) == 0) {
pDest += _thickness;
drawIndex += _thickness;
}
}
}
void GfxSurface::decom11(const byte *&pSrc, byte *&pDest, const byte *&pLookup) {
int yPos = 0, drawIndex = 0;
_yInc = DEFAULT_WIDTH;
_xInc = -1;
--_xSize;
--_ySize;
int areaNum = 0;
while (areaNum != -1) {
switch (areaNum) {
case 0:
*pDest = csuiv(pSrc, pLookup);
areaNum = 1;
break;
case 1:
increments(pDest);
if (!drawIndex) {
NIH();
NIV();
if (yPos == _ySize) {
increments(pDest);
++drawIndex;
} else {
++yPos;
}
*++pDest = csuiv(pSrc, pLookup);
areaNum = 2;
} else if (yPos != _ySize) {
++yPos;
--drawIndex;
areaNum = 0;
} else {
NIH();
NIV();
increments(pDest);
++drawIndex;
*++pDest = csuiv(pSrc, pLookup);
if (drawIndex == _xSize) {
areaNum = -1;
} else {
areaNum = 2;
}
}
break;
case 2:
increments(pDest);
if (!yPos) {
NIH();
NIV();
if (drawIndex == _xSize) {
increments(pDest);
++yPos;
} else {
++drawIndex;
}
pDest += DEFAULT_WIDTH;
areaNum = 0;
} else if (drawIndex != _xSize) {
++drawIndex;
--yPos;
*pDest = csuiv(pSrc, pLookup);
areaNum = 2;
} else {
pDest += DEFAULT_WIDTH;
++yPos;
NIH();
NIV();
increments(pDest);
*pDest = csuiv(pSrc, pLookup);
if (yPos == _ySize)
areaNum = -1;
else
areaNum = 1;
}
break;
}
}
}
void GfxSurface::diag(const byte *&pSrc, byte *&pDest, const byte *&pLookup) {
int diagIndex = 0, drawIndex = 0;
--_xEnd;
while (!TFP(diagIndex)) {
for (;;) {
NIH();
for (int idx = 0; idx <= _thickness; ++idx) {
*pDest = csuiv(pSrc, pLookup);
NIH();
increments(pDest);
}
NIV();
pDest += _yInc;
for (int idx = 0; idx <= _thickness; ++idx) {
*pDest = csuiv(pSrc, pLookup);
NIH();
increments(pDest);
}
NIH();
NIV();
increments(pDest);
++drawIndex;
if (_xEnd < (drawIndex + 1)) {
TF1(pDest, diagIndex);
break;
}
pDest += _xInc;
++drawIndex;
if (_xEnd < (drawIndex + 1)) {
TF2(pSrc, pDest, pLookup, diagIndex);
break;
}
}
if (TFP(diagIndex))
break;
for (;;) {
for (int idx = 0; idx <= _thickness; ++idx) {
*pDest = csuiv(pSrc, pLookup);
NIH();
increments(pDest);
}
NIV();
pDest += _yInc;
for (int idx = 0; idx <= _thickness; ++idx) {
*pDest = csuiv(pSrc, pLookup);
NIH();
increments(pDest);
}
NIH();
NIV();
increments(pDest);
if (--drawIndex == 0) {
TF1(pDest, diagIndex);
NIH();
break;
} else {
pDest += _xInc;
if (--drawIndex == 0) {
TF2(pSrc, pDest, pLookup, diagIndex);
NIH();
break;
}
}
NIH();
}
}
}
void GfxSurface::increments(byte *&pDest) {
pDest += _xInc + _yInc;
}
void GfxSurface::NIH() {
_xInc = -_xInc;
}
void GfxSurface::NIV() {
_yInc = -_yInc;
}
bool GfxSurface::TFP(int v) {
int diff = _yEnd - v;
if (!diff)
// Time to finish loop in outer method
return true;
if (diff < (_thickness + 1))
_thickness = diff - 1;
return false;
}
void GfxSurface::TF1(byte *&pDest, int &v) {
v += _thickness + 1;
pDest += (_thickness + 1) * _yInc;
}
void GfxSurface::TF2(const byte *&pSrc, byte *&pDest, const byte *&pLookup, int &v) {
v += _thickness + 1;
for (int idx = 0; idx <= _thickness; ++idx) {
*pDest = csuiv(pSrc, pLookup);
pDest += _yInc;
}
}
/*-------------------------------------------------------------------------*/
GfxSurface::~GfxSurface() {
free();
}
/*-------------------------------------------------------------------------*
* Screen surface
*-------------------------------------------------------------------------*/
/**
* Called to populate the font data from the passed file
*/
void ScreenSurface::readFontData(Common::File &f, int dataSize) {
assert(dataSize == (FONT_NUM_CHARS * FONT_HEIGHT));
f.read(_fontData, FONT_NUM_CHARS * FONT_HEIGHT);
}
/**
* Returns a graphics surface representing a subset of the screen. The affected area
* is also marked as dirty
*/
Graphics::Surface ScreenSurface::lockArea(const Common::Rect &bounds) {
_dirtyRects.push_back(bounds);
Graphics::Surface s;
s.format = format;
s.pixels = getBasePtr(bounds.left, bounds.top);
s.pitch = pitch;
s.w = bounds.width();
s.h = bounds.height();
return s;
}
/**
* Updates the affected areas of the surface to the underlying physical screen
*/
void ScreenSurface::updateScreen() {
// Iterate through copying dirty areas to the screen
for (Common::List<Common::Rect>::iterator i = _dirtyRects.begin(); i != _dirtyRects.end(); ++i) {
Common::Rect r = *i;
g_system->copyRectToScreen((const byte *)getBasePtr(r.left, r.top), pitch,
r.left, r.top, r.width(), r.height());
}
_dirtyRects.clear();
// Update the screen
g_system->updateScreen();
}
/**
* Draws a decoded picture on the screen
* @remarks - Because the ScummVM surface is using a double height 640x400 surface to
* simulate the original 640x400 surface, all Y values have to be doubled.
* - Image resources are stored at 320x200, so when drawn onto the screen a single pixel
* from the source image is drawn using the two pixels at the given index in the palette map
* - Because the original game supported 320 width resolutions, the X coordinate
* also needs to be doubled for EGA mode
*/
void ScreenSurface::drawPicture(GfxSurface &surface, int x, int y) {
// Adjust the draw position by the draw offset
x += surface._offset.x;
y += surface._offset.y;
// Lock the affected area of the surface to write to
Graphics::Surface destSurface = lockArea(Common::Rect(x * 2, y * 2,
(x + surface.w) * 2, (y + surface.h) * 2));
// Get a lookup for the palette mapping
const byte *paletteMap = &g_mem[0x7000 * 16 + 2];
// Loop through writing
for (int yp = 0; yp < surface.h; ++yp) {
if (((y + yp) < 0) || ((y + yp) >= 200))
continue;
const byte *pSrc = (const byte *)surface.getBasePtr(0, yp);
byte *pDest = (byte *)destSurface.getBasePtr(0, yp * 2);
for (int xp = 0; xp < surface.w; ++xp, ++pSrc) {
// Draw the pixel using the specified index in the palette map
*pDest = paletteMap[*pSrc * 2];
*(pDest + SCREEN_WIDTH) = paletteMap[*pSrc * 2];
++pDest;
// Use the secondary mapping value to draw the secondary column pixel
*pDest = paletteMap[*pSrc * 2 + 1];
*(pDest + SCREEN_WIDTH) = paletteMap[*pSrc * 2 + 1];
++pDest;
}
}
}
/**
* Copys a given surface to the given position
*/
void ScreenSurface::copyFrom(Graphics::Surface &src, int x, int y) {
Graphics::Surface destSurface = lockArea(Common::Rect(x, y, x + src.w, y + src.h));
// Loop through writing
for (int yp = 0; yp < src.h; ++yp) {
if (((y + yp) < 0) || ((y + yp) >= SCREEN_HEIGHT))
continue;
const byte *pSrc = (const byte *)src.getBasePtr(0, yp);
byte *pDest = (byte *)getBasePtr(0, yp);
Common::copy(pSrc, pSrc + src.w, pDest);
}
}
/**
* Draws a character at the specified co-ordinates
* @remarks Because the ScummVM surface is using a double height 640x400 surface to
* simulate the original 640x400 surface, all Y values have to be doubled
*/
void ScreenSurface::writeCharacter(const Common::Point &pt, unsigned char ch, int palIndex) {
Graphics::Surface destSurface = lockArea(Common::Rect(pt.x, pt.y * 2,
pt.x + FONT_WIDTH, (pt.y + FONT_HEIGHT) * 2));
// Get the start of the character to use
assert((ch >= ' ') && (ch <= (unsigned char)(32 + FONT_NUM_CHARS)));
const byte *charData = &_fontData[((int)ch - 32) * FONT_HEIGHT];
// Loop through decoding each character's data
for (int yp = 0; yp < FONT_HEIGHT; ++yp) {
byte *lineP = (byte *)destSurface.getBasePtr(0, yp * 2);
byte byteVal = *charData++;
for (int xp = 0; xp < FONT_WIDTH; ++xp, ++lineP, byteVal <<= 1) {
if (byteVal & 0x80) {
*lineP = palIndex;
*(lineP + SCREEN_WIDTH) = palIndex;
}
}
}
}
/**
* Draws a box at the specified position and size
* @remarks Because the ScummVM surface is using a double height 640x400 surface to
* simulate the original 640x400 surface, all Y values have to be doubled
*/
void ScreenSurface::drawBox(int x, int y, int dx, int dy, int col) {
if (g_res == 1) {
x = (uint)x >> 1;
dx = (uint)dx >> 1;
}
Graphics::Surface destSurface = lockArea(Common::Rect(x, y * 2, x + dx, (y + dy) * 2));
destSurface.hLine(0, 0, dx, col);
destSurface.hLine(0, 1, dx, col);
destSurface.hLine(0, destSurface.h - 1, dx, col);
destSurface.hLine(0, destSurface.h - 2, dx, col);
destSurface.vLine(0, 2, destSurface.h - 3, col);
destSurface.vLine(1, 2, destSurface.h - 3, col);