scummvm/graphics/sjis.cpp
athrxx e4e5e68f0d KYRA: implement SJIS features required for EOB II FM-Towns
- low res font drawing for intro and outro texts
- fat print mode for ingame texts
2018-11-14 17:22:20 +01:00

683 lines
20 KiB
C++

/* 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/scummsys.h"
#include "graphics/sjis.h"
#ifdef GRAPHICS_SJIS_H
#include "common/debug.h"
#include "common/archive.h"
#include "common/endian.h"
#include "common/stream.h"
#include "common/textconsole.h"
#include "graphics/surface.h"
namespace Graphics {
FontSJIS *FontSJIS::createFont(const Common::Platform platform) {
FontSJIS *ret = 0;
// Try the font ROM of the specified platform
if (platform == Common::kPlatformFMTowns) {
ret = new FontTowns();
if (ret->loadData())
return ret;
delete ret;
} else if (platform == Common::kPlatformPCEngine) {
ret = new FontPCEngine();
if (ret->loadData())
return ret;
delete ret;
} // TODO: PC98 font rom support
/* else if (platform == Common::kPlatformPC98) {
ret = new FontPC98();
if (ret->loadData())
return ret;
delete ret;
}*/
// Try ScummVM's font.
ret = new FontSjisSVM(platform);
if (ret->loadData())
return ret;
delete ret;
return 0;
}
void FontSJIS::drawChar(Graphics::Surface &dst, uint16 ch, int x, int y, uint32 c1, uint32 c2) const {
drawChar(dst.getBasePtr(x, y), ch, dst.pitch, dst.format.bytesPerPixel, c1, c2, dst.w - x, dst.h - y);
}
FontSJISBase::FontSJISBase()
: _drawMode(kDefaultMode), _flippedMode(false), _fatPrint(false), _fontWidth(16), _fontHeight(16), _bitPosNewLineMask(0) {
}
void FontSJISBase::setDrawingMode(DrawingMode mode) {
if (hasFeature(1 << mode))
_drawMode = mode;
else
warning("Unsupported drawing mode selected");
}
void FontSJISBase::toggleFlippedMode(bool enable) {
if (hasFeature(kFeatFlipped))
_flippedMode = enable;
else
warning("Flipped mode unsupported by this font");
}
void FontSJISBase::toggleFatPrint(bool enable) {
if (hasFeature(kFeatFatPrint))
_fatPrint = enable;
else
warning("Fat print unsupported by this font");
}
uint FontSJISBase::getFontHeight() const {
switch (_drawMode) {
case kOutlineMode:
return _fontHeight + 2;
case kDefaultMode:
return _fontHeight;
default:
return _fontHeight + 1;
}
}
uint FontSJISBase::getMaxFontWidth() const {
switch (_drawMode) {
case kOutlineMode:
return _fontWidth + 2;
case kDefaultMode:
return _fontWidth;
default:
return _fontWidth + 1;
}
}
uint FontSJISBase::getCharWidth(uint16 ch) const {
if (isASCII(ch))
return ((_drawMode == kOutlineMode) ? 10 : (_drawMode == kDefaultMode ? 8 : 9));
else
return getMaxFontWidth();
}
template<typename Color>
void FontSJISBase::blitCharacter(const uint8 *glyph, const int w, const int h, uint8 *dst, int pitch, Color c) const {
uint8 bitPos = 0;
uint8 mask = 0;
for (int y = 0; y < h; ++y) {
Color *d = (Color *)dst;
dst += pitch;
bitPos &= _bitPosNewLineMask;
for (int x = 0; x < w; ++x) {
if (!(bitPos % 8))
mask = *glyph++;
if (mask & 0x80)
*d = c;
++d;
++bitPos;
mask <<= 1;
}
}
}
void FontSJISBase::createOutline(uint8 *outline, const uint8 *glyph, const int w, const int h) const {
const int glyphPitch = (w + 7) / 8;
const int outlinePitch = (w + 9) / 8;
uint8 *line1 = outline + 0 * outlinePitch;
uint8 *line2 = outline + 1 * outlinePitch;
uint8 *line3 = outline + 2 * outlinePitch;
for (int y = 0; y < h; ++y) {
for (int x = 0; x < glyphPitch; ++x) {
const uint8 mask = *glyph++;
const uint8 b1 = mask | (mask >> 1) | (mask >> 2);
const uint8 b2 = (mask << 7) | ((mask << 6) & 0xC0);
line1[x] |= b1;
line2[x] |= b1;
line3[x] |= b1;
if (x + 1 < outlinePitch) {
line1[x + 1] |= b2;
line2[x + 1] |= b2;
line3[x + 1] |= b2;
}
}
line1 += outlinePitch;
line2 += outlinePitch;
line3 += outlinePitch;
}
}
#ifndef DISABLE_FLIPPED_MODE
const uint8 *FontSJISBase::flipCharacter(const uint8 *glyph, const int w) const {
static const uint8 flipData[] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
0x0F, 0x8F, 0x4F, 0xC7, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x97, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
};
for (int i = 0; i < w; i++) {
_tempGlyph[i] = flipData[glyph[(w * 2 - 1) - i]];
_tempGlyph[(w * 2 - 1) - i] = flipData[glyph[i]];
}
return _tempGlyph;
}
#endif
const uint8 *FontSJISBase::makeFatCharacter(const uint8 *glyph, const int w) const {
// This is the EOB II FM-Towns implementation.
// The last bit to the right of each line is cut off so that the fat
// character actually has the same width as it would normally have.
if (w == 8) {
for (int i = 0; i < 16; ++i) {
_tempGlyph2[i] = *glyph | (*glyph >> 1);
glyph++;
}
} else {
for (int i = 0; i < 16; ++i) {
uint16 l = READ_BE_UINT16(glyph);
WRITE_BE_UINT16(&_tempGlyph2[i << 1], l | (l >> 1));
glyph += 2;
}
}
return _tempGlyph2;
}
void FontSJISBase::drawChar(void *dst, uint16 ch, int pitch, int bpp, uint32 c1, uint32 c2, int maxW, int maxH) const {
const uint8 *glyphSource = 0;
int width = 0, height = 0;
int outlineExtraWidth = 2, outlineExtraHeight = 2;
int outlineXOffset = 0, outlineYOffset = 0;
if (isASCII(ch)) {
glyphSource = getCharData(ch);
width = 8;
height = _fontHeight;
} else {
glyphSource = getCharData(ch);
width = _fontWidth;
height = _fontHeight;
}
if (maxW != -1 && maxW < width) {
width = maxW;
outlineExtraWidth = 0;
outlineXOffset = 1;
}
if (maxH != -1 && maxH < height) {
height = maxH;
outlineExtraHeight = 0;
outlineYOffset = 1;
}
if (width <= 0 || height <= 0)
return;
if (!glyphSource) {
warning("FontSJISBase::drawChar: Font does not offer data for %02X %02X", ch & 0xFF, ch >> 8);
return;
}
if (_fatPrint)
glyphSource = makeFatCharacter(glyphSource, width);
#ifndef DISABLE_FLIPPED_MODE
if (_flippedMode)
glyphSource = flipCharacter(glyphSource, width);
#endif
uint8 outline[18 * 18];
if (_drawMode == kOutlineMode) {
memset(outline, 0, sizeof(outline));
createOutline(outline, glyphSource, width, height);
}
if (bpp == 1) {
if (_drawMode == kOutlineMode) {
blitCharacter<uint8>(outline, width + outlineExtraWidth, height + outlineExtraHeight, (uint8 *)dst, pitch, c2);
blitCharacter<uint8>(glyphSource, width - outlineXOffset, height - outlineYOffset, (uint8 *)dst + pitch + 1, pitch, c1);
} else {
if (_drawMode != kDefaultMode) {
blitCharacter<uint8>(glyphSource, width - outlineXOffset, height, ((uint8 *)dst) + 1, pitch, c2);
blitCharacter<uint8>(glyphSource, width, height - outlineYOffset, ((uint8 *)dst) + pitch, pitch, c2);
if (_drawMode == kShadowMode)
blitCharacter<uint8>(glyphSource, width - outlineXOffset, height - outlineYOffset, ((uint8 *)dst) + pitch + 1, pitch, c2);
}
blitCharacter<uint8>(glyphSource, width, height, (uint8 *)dst, pitch, c1);
}
} else if (bpp == 2) {
if (_drawMode == kOutlineMode) {
blitCharacter<uint16>(outline, width + outlineExtraWidth, height + outlineExtraHeight, (uint8 *)dst, pitch, c2);
blitCharacter<uint16>(glyphSource, width - outlineXOffset, height - outlineYOffset, (uint8 *)dst + pitch + 2, pitch, c1);
} else {
if (_drawMode != kDefaultMode) {
blitCharacter<uint16>(glyphSource, width - outlineXOffset, height, ((uint8 *)dst) + 2, pitch, c2);
blitCharacter<uint16>(glyphSource, width, height - outlineYOffset, ((uint8 *)dst) + pitch, pitch, c2);
if (_drawMode == kShadowMode)
blitCharacter<uint16>(glyphSource, width - outlineXOffset, height - outlineYOffset, ((uint8 *)dst) + pitch + 2, pitch, c2);
}
blitCharacter<uint16>(glyphSource, width, height, (uint8 *)dst, pitch, c1);
}
} else {
error("FontSJISBase::drawChar: unsupported bpp: %d", bpp);
}
}
bool FontSJISBase::isASCII(uint16 ch) const {
if (ch >= 0xFF)
return false;
else if (ch <= 0x7F || (ch >= 0xA1 && ch <= 0xDF))
return true;
else
return false;
}
// FM-TOWNS ROM font
bool FontTowns::loadData() {
Common::SeekableReadStream *data = SearchMan.createReadStreamForMember("FMT_FNT.ROM");
if (!data)
return false;
data->read(_fontData16x16, kFont16x16Chars * 32);
data->seek(251904, SEEK_SET);
data->read(_fontData8x16, kFont8x16Chars * 16);
bool retValue = !data->err();
delete data;
return retValue;
}
const uint8 *FontTowns::getCharData(uint16 ch) const {
if (ch < kFont8x16Chars) {
return _fontData8x16 + ch * 16;
} else {
uint8 f = ch & 0xFF;
uint8 s = ch >> 8;
// moved from scumm\charset.cpp
enum {
KANA = 0,
KANJI = 1,
EKANJI = 2
};
int base = s - ((s + 1) % 32);
int c = 0, p = 0, chunk_f = 0, chunk = 0, cr = 0, kanjiType = KANA;
if (f >= 0x81 && f <= 0x84) kanjiType = KANA;
if (f >= 0x88 && f <= 0x9f) kanjiType = KANJI;
if (f >= 0xe0 && f <= 0xea) kanjiType = EKANJI;
if ((f > 0xe8 || (f == 0xe8 && base >= 0x9f)) || (f > 0x90 || (f == 0x90 && base >= 0x9f))) {
c = 48; // correction
p = -8; // correction
}
if (kanjiType == KANA) {
chunk_f = (f - 0x81) * 2;
} else if (kanjiType == KANJI) { // Standard Kanji
p += f - 0x88;
chunk_f = c + 2 * p;
} else if (kanjiType == EKANJI) { // Enhanced Kanji
p += f - 0xe0;
chunk_f = c + 2 * p;
}
// Base corrections
if (base == 0x7f && s == 0x7f)
base -= 0x20;
if (base == 0x9f && s == 0xbe)
base += 0x20;
if (base == 0xbf && s == 0xde)
base += 0x20;
//if (base == 0x7f && s == 0x9e)
// base += 0x20;
switch (base) {
case 0x3f:
cr = 0; // 3f
if (kanjiType == KANA) chunk = 1;
else if (kanjiType == KANJI) chunk = 31;
else if (kanjiType == EKANJI) chunk = 111;
break;
case 0x5f:
cr = 0; // 5f
if (kanjiType == KANA) chunk = 17;
else if (kanjiType == KANJI) chunk = 47;
else if (kanjiType == EKANJI) chunk = 127;
break;
case 0x7f:
cr = -1; // 80
if (kanjiType == KANA) chunk = 9;
else if (kanjiType == KANJI) chunk = 63;
else if (kanjiType == EKANJI) chunk = 143;
break;
case 0x9f:
cr = 1; // 9e
if (kanjiType == KANA) chunk = 2;
else if (kanjiType == KANJI) chunk = 32;
else if (kanjiType == EKANJI) chunk = 112;
break;
case 0xbf:
cr = 1; // be
if (kanjiType == KANA) chunk = 18;
else if (kanjiType == KANJI) chunk = 48;
else if (kanjiType == EKANJI) chunk = 128;
break;
case 0xdf:
cr = 1; // de
if (kanjiType == KANA) chunk = 10;
else if (kanjiType == KANJI) chunk = 64;
else if (kanjiType == EKANJI) chunk = 144;
break;
default:
debug(4, "Invalid Char! f %x s %x base %x c %d p %d", f, s, base, c, p);
}
debug(6, "Kanji: %c%c f 0x%x s 0x%x base 0x%x c %d p %d chunk %d cr %d index %d", f, s, f, s, base, c, p, chunk, cr, ((chunk_f + chunk) * 32 + (s - base)) + cr);
const int chunkNum = (((chunk_f + chunk) * 32 + (s - base)) + cr);
if (chunkNum < 0 || chunkNum >= kFont16x16Chars)
return 0;
else
return _fontData16x16 + chunkNum * 32;
}
}
bool FontTowns::hasFeature(int feat) const {
static const int features = kFeatDefault | kFeatOutline | kFeatShadow | kFeatFMTownsShadow | kFeatFlipped | kFeatFatPrint;
return (features & feat) ? true : false;
}
// PC-Engine ROM font
bool FontPCEngine::loadData() {
Common::SeekableReadStream *data = SearchMan.createReadStreamForMember("pce.cdbios");
if (!data)
return false;
data->seek((data->size() & 0x200) ? 0x30200 : 0x30000);
data->read(_fontData12x12, kFont12x12Chars * 18);
_fontWidth = _fontHeight = 12;
_bitPosNewLineMask = _fontWidth & 7;
bool retValue = !data->err();
delete data;
return retValue;
}
const uint8 *FontPCEngine::getCharData(uint16 ch) const {
// Converts sjis code to pce font offset
// (moved from scumm\charset.cpp).
// rangeTbl maps SJIS char-codes to the PCE System Card font rom.
// Each pair {<upperBound>,<lowerBound>} in the array represents a SJIS range.
const int rangeCnt = 45;
static const uint16 rangeTbl[rangeCnt][2] = {
// Symbols
{ 0x8140, 0x817E }, { 0x8180, 0x81AC },
// 0-9
{ 0x824F, 0x8258 },
// Latin upper
{ 0x8260, 0x8279 },
// Latin lower
{ 0x8281, 0x829A },
// Kana
{ 0x829F, 0x82F1 }, { 0x8340, 0x837E }, { 0x8380, 0x8396},
// Greek upper
{ 0x839F, 0x83B6 },
// Greek lower
{ 0x83BF, 0x83D6 },
// Cyrillic upper
{ 0x8440, 0x8460 },
// Cyrillic lower
{ 0x8470, 0x847E }, { 0x8480, 0x8491},
// Kanji
{ 0x889F, 0x88FC },
{ 0x8940, 0x897E }, { 0x8980, 0x89FC },
{ 0x8A40, 0x8A7E }, { 0x8A80, 0x8AFC },
{ 0x8B40, 0x8B7E }, { 0x8B80, 0x8BFC },
{ 0x8C40, 0x8C7E }, { 0x8C80, 0x8CFC },
{ 0x8D40, 0x8D7E }, { 0x8D80, 0x8DFC },
{ 0x8E40, 0x8E7E }, { 0x8E80, 0x8EFC },
{ 0x8F40, 0x8F7E }, { 0x8F80, 0x8FFC },
{ 0x9040, 0x907E }, { 0x9080, 0x90FC },
{ 0x9140, 0x917E }, { 0x9180, 0x91FC },
{ 0x9240, 0x927E }, { 0x9280, 0x92FC },
{ 0x9340, 0x937E }, { 0x9380, 0x93FC },
{ 0x9440, 0x947E }, { 0x9480, 0x94FC },
{ 0x9540, 0x957E }, { 0x9580, 0x95FC },
{ 0x9640, 0x967E }, { 0x9680, 0x96FC },
{ 0x9740, 0x977E }, { 0x9780, 0x97FC },
{ 0x9840, 0x9872 }
};
ch = (ch << 8) | (ch >> 8);
int offset = 0;
for (int i = 0; i < rangeCnt; ++i) {
if (ch >= rangeTbl[i][0] && ch <= rangeTbl[i][1]) {
return _fontData12x12 + 18 * (offset + ch - rangeTbl[i][0]);
break;
}
offset += rangeTbl[i][1] - rangeTbl[i][0] + 1;
}
debug(4, "Invalid Char: 0x%x", ch);
return 0;
}
bool FontPCEngine::hasFeature(int feat) const {
// Outline mode not supported due to use of _bitPosNewLineMask. This could be implemented,
// but is not needed for any particular target at the moment.
// Flipped mode is also not supported since the hard coded table (taken from SCUMM 5 FM-TOWNS)
// is set up for font sizes of 8/16. This mode is also not required at the moment, since
// there aren't any SCUMM 5 PC-Engine games.
static const int features = kFeatDefault | kFeatShadow | kFeatFMTownsShadow;
return (features & feat) ? true : false;
}
// ScummVM SJIS font
FontSjisSVM::FontSjisSVM(const Common::Platform platform)
: _fontData16x16(0), _fontData16x16Size(0), _fontData8x16(0), _fontData8x16Size(0),
_fontData12x12(0), _fontData12x12Size(0) {
if (platform == Common::kPlatformPCEngine) {
_fontWidth = 12;
_fontHeight = 12;
}
}
FontSjisSVM::~FontSjisSVM() {
delete[] _fontData16x16;
delete[] _fontData8x16;
delete[] _fontData12x12;
}
bool FontSjisSVM::loadData() {
Common::SeekableReadStream *data = SearchMan.createReadStreamForMember("SJIS.FNT");
if (!data)
return false;
uint32 magic1 = data->readUint32BE();
uint32 magic2 = data->readUint32BE();
if (magic1 != MKTAG('S', 'C', 'V', 'M') || magic2 != MKTAG('S', 'J', 'I', 'S')) {
delete data;
return false;
}
uint32 version = data->readUint32BE();
if (version != kSjisFontVersion) {
warning("SJIS font version mismatch, expected: %d found: %u", kSjisFontVersion, version);
delete data;
return false;
}
uint numChars16x16 = data->readUint16BE();
uint numChars8x16 = data->readUint16BE();
uint numChars12x12 = data->readUint16BE();
if (_fontWidth == 16) {
_fontData16x16Size = numChars16x16 * 32;
_fontData16x16 = new uint8[_fontData16x16Size];
assert(_fontData16x16);
data->read(_fontData16x16, _fontData16x16Size);
_fontData8x16Size = numChars8x16 * 16;
_fontData8x16 = new uint8[numChars8x16 * 16];
assert(_fontData8x16);
data->read(_fontData8x16, _fontData8x16Size);
} else {
data->skip(numChars16x16 * 32);
data->skip(numChars8x16 * 16);
_fontData12x12Size = numChars12x12 * 24;
_fontData12x12 = new uint8[_fontData12x12Size];
assert(_fontData12x12);
data->read(_fontData12x12, _fontData12x12Size);
}
bool retValue = !data->err();
delete data;
return retValue;
}
const uint8 *FontSjisSVM::getCharData(uint16 c) const {
if (_fontWidth == 12)
return getCharDataPCE(c);
else
return getCharDataDefault(c);
}
bool FontSjisSVM::hasFeature(int feat) const {
// Flipped mode is not supported since the hard coded table (taken from SCUMM 5 FM-TOWNS)
// is set up for font sizes of 8/16. This mode is also not required at the moment, since
// there aren't any SCUMM 5 PC-Engine games.
static const int features16 = kFeatDefault | kFeatOutline | kFeatShadow | kFeatFMTownsShadow | kFeatFlipped | kFeatFatPrint;
static const int features12 = kFeatDefault | kFeatOutline | kFeatShadow | kFeatFMTownsShadow;
return (((_fontWidth == 12) ? features12 : features16) & feat) ? true : false;
}
const uint8 *FontSjisSVM::getCharDataPCE(uint16 c) const {
if (isASCII(c))
return 0;
const uint8 fB = c & 0xFF;
const uint8 sB = c >> 8;
int base, index;
mapKANJIChar(fB, sB, base, index);
if (base == -1)
return 0;
const uint offset = (base * 0xBC + index) * 24;
assert(offset + 16 <= _fontData12x12Size);
return _fontData12x12 + offset;
}
const uint8 *FontSjisSVM::getCharDataDefault(uint16 c) const {
const uint8 fB = c & 0xFF;
const uint8 sB = c >> 8;
if (isASCII(c)) {
int index = fB;
// half-width katakana
if (fB >= 0xA1 && fB <= 0xDF)
index -= 0x21;
const uint offset = index * 16;
assert(offset <= _fontData8x16Size);
return _fontData8x16 + offset;
} else {
int base, index;
mapKANJIChar(fB, sB, base, index);
if (base == -1)
return 0;
const uint offset = (base * 0xBC + index) * 32;
assert(offset + 16 <= _fontData16x16Size);
return _fontData16x16 + offset;
}
}
void FontSjisSVM::mapKANJIChar(const uint8 fB, const uint8 sB, int &base, int &index) const {
base = index = -1;
// We only allow 2 byte SJIS characters.
if (fB <= 0x80 || fB >= 0xF0 || (fB >= 0xA0 && fB <= 0xDF) || sB == 0x7F)
return;
base = fB - 0x81;
if (base >= 0x5F)
base -= 0x40;
index = sB - 0x40;
if (index >= 0x3F)
--index;
// Another check if the passed character was an
// correctly encoded SJIS character.
if (index < 0 || index >= 0xBC || base < 0)
base = index = -1;
}
} // End of namespace Graphics
#endif // defined(GRAPHICS_SJIS_H)