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-rw-r--r--graphics/jpeg.cpp104
-rw-r--r--graphics/jpeg.h6
2 files changed, 56 insertions, 54 deletions
diff --git a/graphics/jpeg.cpp b/graphics/jpeg.cpp
index 5fee371225..2acfe308aa 100644
--- a/graphics/jpeg.cpp
+++ b/graphics/jpeg.cpp
@@ -46,7 +46,7 @@ static const uint8 _zigZagOrder[64] = {
};
JPEG::JPEG() :
- _str(NULL), _w(0), _h(0), _numComp(0), _components(NULL), _numScanComp(0),
+ _stream(NULL), _w(0), _h(0), _numComp(0), _components(NULL), _numScanComp(0),
_scanComp(NULL), _currentComp(NULL) {
// Initialize the quantization tables
@@ -108,7 +108,7 @@ Surface *JPEG::getSurface(const PixelFormat &format) {
void JPEG::reset() {
// Reset member variables
- _str = NULL;
+ _stream = NULL;
_w = _h = 0;
// Free the components
@@ -137,16 +137,16 @@ void JPEG::reset() {
}
}
-bool JPEG::read(Common::SeekableReadStream *str) {
+bool JPEG::read(Common::SeekableReadStream *stream) {
// Reset member variables and tables from previous reads
reset();
// Save the input stream
- _str = str;
+ _stream = stream;
bool ok = true;
bool done = false;
- while (!_str->eos() && ok && !done) {
+ while (!_stream->eos() && ok && !done) {
// Read the marker
// WORKAROUND: While each and every JPEG file should end with
@@ -158,10 +158,10 @@ bool JPEG::read(Common::SeekableReadStream *str) {
// Apparently, the customary workaround is to insert a fake
// EOI tag.
- uint16 marker = _str->readByte();
+ uint16 marker = _stream->readByte();
bool fakeEOI = false;
- if (_str->eos()) {
+ if (_stream->eos()) {
fakeEOI = true;
marker = 0xFF;
}
@@ -172,10 +172,10 @@ bool JPEG::read(Common::SeekableReadStream *str) {
break;
}
- while (marker == 0xFF && !_str->eos())
- marker = _str->readByte();
+ while (marker == 0xFF && !_stream->eos())
+ marker = _stream->readByte();
- if (_str->eos()) {
+ if (_stream->eos()) {
fakeEOI = true;
marker = 0xD9;
}
@@ -206,12 +206,12 @@ bool JPEG::read(Common::SeekableReadStream *str) {
ok = readJFIF();
break;
case 0xFE: // Comment
- _str->seek(_str->readUint16BE() - 2, SEEK_CUR);
+ _stream->seek(_stream->readUint16BE() - 2, SEEK_CUR);
break;
default: { // Unknown marker
- uint16 size = _str->readUint16BE();
+ uint16 size = _stream->readUint16BE();
warning("JPEG: Unknown marker %02X, skipping %d bytes", marker, size - 2);
- _str->seek(size - 2, SEEK_CUR);
+ _stream->seek(size - 2, SEEK_CUR);
}
}
}
@@ -219,26 +219,26 @@ bool JPEG::read(Common::SeekableReadStream *str) {
}
bool JPEG::readJFIF() {
- uint16 length = _str->readUint16BE();
- uint32 tag = _str->readUint32BE();
+ uint16 length = _stream->readUint16BE();
+ uint32 tag = _stream->readUint32BE();
if (tag != MKID_BE('JFIF')) {
warning("JPEG::readJFIF() tag mismatch");
return false;
}
- if (_str->readByte() != 0) { // NULL
+ if (_stream->readByte() != 0) { // NULL
warning("JPEG::readJFIF() NULL mismatch");
return false;
}
- byte majorVersion = _str->readByte();
- byte minorVersion = _str->readByte();
+ byte majorVersion = _stream->readByte();
+ byte minorVersion = _stream->readByte();
if(majorVersion != 1 || minorVersion != 1)
warning("JPEG::readJFIF() Non-v1.1 JPEGs may not be handled correctly");
- /* byte densityUnits = */ _str->readByte();
- /* uint16 xDensity = */ _str->readUint16BE();
- /* uint16 yDensity = */ _str->readUint16BE();
- byte thumbW = _str->readByte();
- byte thumbH = _str->readByte();
- _str->seek(thumbW * thumbH * 3, SEEK_CUR); // Ignore thumbnail
+ /* byte densityUnits = */ _stream->readByte();
+ /* uint16 xDensity = */ _stream->readUint16BE();
+ /* uint16 yDensity = */ _stream->readUint16BE();
+ byte thumbW = _stream->readByte();
+ byte thumbH = _stream->readByte();
+ _stream->seek(thumbW * thumbH * 3, SEEK_CUR); // Ignore thumbnail
if (length != (thumbW * thumbH * 3) + 16) {
warning("JPEG::readJFIF() length mismatch");
return false;
@@ -249,21 +249,21 @@ bool JPEG::readJFIF() {
// Marker 0xC0 (Start Of Frame, Baseline DCT)
bool JPEG::readSOF0() {
debug(5, "JPEG: readSOF0");
- uint16 size = _str->readUint16BE();
+ uint16 size = _stream->readUint16BE();
// Read the sample precision
- uint8 precision = _str->readByte();
+ uint8 precision = _stream->readByte();
if (precision != 8) {
warning("JPEG: Just 8 bit precision supported at the moment");
return false;
}
// Image size
- _h = _str->readUint16BE();
- _w = _str->readUint16BE();
+ _h = _stream->readUint16BE();
+ _w = _stream->readUint16BE();
// Number of components
- _numComp = _str->readByte();
+ _numComp = _stream->readByte();
if (size != 8 + 3 * _numComp) {
warning("JPEG: Invalid number of components");
return false;
@@ -275,11 +275,11 @@ bool JPEG::readSOF0() {
// Read the components details
for (int c = 0; c < _numComp; c++) {
- _components[c].id = _str->readByte();
- _components[c].factorH = _str->readByte();
+ _components[c].id = _stream->readByte();
+ _components[c].factorH = _stream->readByte();
_components[c].factorV = _components[c].factorH & 0xF;
_components[c].factorH >>= 4;
- _components[c].quantTableSelector = _str->readByte();
+ _components[c].quantTableSelector = _stream->readByte();
}
return true;
@@ -288,12 +288,12 @@ bool JPEG::readSOF0() {
// Marker 0xC4 (Define Huffman Tables)
bool JPEG::readDHT() {
debug(5, "JPEG: readDHT");
- uint16 size = _str->readUint16BE() - 2;
- uint32 pos = _str->pos();
+ uint16 size = _stream->readUint16BE() - 2;
+ uint32 pos = _stream->pos();
- while ((uint32)_str->pos() < (size + pos)) {
+ while ((uint32)_stream->pos() < (size + pos)) {
// Read the table type and id
- uint8 tableId = _str->readByte();
+ uint8 tableId = _stream->readByte();
uint8 tableType = tableId >> 4; // type 0: DC, 1: AC
tableId &= 0xF;
uint8 tableNum = (tableId << 1) + tableType;
@@ -307,7 +307,7 @@ bool JPEG::readDHT() {
uint8 numValues[16];
_huff[tableNum].count = 0;
for (int len = 0; len < 16; len++) {
- numValues[len] = _str->readByte();
+ numValues[len] = _stream->readByte();
_huff[tableNum].count += numValues[len];
}
@@ -320,7 +320,7 @@ bool JPEG::readDHT() {
int cur = 0;
for (int len = 0; len < 16; len++) {
for (int i = 0; i < numValues[len]; i++) {
- _huff[tableNum].values[cur] = _str->readByte();
+ _huff[tableNum].values[cur] = _stream->readByte();
_huff[tableNum].sizes[cur] = len + 1;
cur++;
}
@@ -350,10 +350,10 @@ bool JPEG::readDHT() {
// Marker 0xDA (Start Of Scan)
bool JPEG::readSOS() {
debug(5, "JPEG: readSOS");
- uint16 size = _str->readUint16BE();
+ uint16 size = _stream->readUint16BE();
// Number of scan components
- _numScanComp = _str->readByte();
+ _numScanComp = _stream->readByte();
if (size != 6 + 2 * _numScanComp) {
warning("JPEG: Invalid number of components");
return false;
@@ -370,7 +370,7 @@ bool JPEG::readSOS() {
// Component-specification parameters
for (int c = 0; c < _numScanComp; c++) {
// Read the desired component id
- uint8 id = _str->readByte();
+ uint8 id = _stream->readByte();
// Search the component with the specified id
bool found = false;
@@ -390,7 +390,7 @@ bool JPEG::readSOS() {
}
// Read the entropy table selectors
- _scanComp[c]->DCentropyTableSelector = _str->readByte();
+ _scanComp[c]->DCentropyTableSelector = _stream->readByte();
_scanComp[c]->ACentropyTableSelector = _scanComp[c]->DCentropyTableSelector & 0xF;
_scanComp[c]->DCentropyTableSelector >>= 4;
@@ -406,19 +406,19 @@ bool JPEG::readSOS() {
}
// Start of spectral selection
- if (_str->readByte() != 0) {
+ if (_stream->readByte() != 0) {
warning("JPEG: Progressive scanning not supported");
return false;
}
// End of spectral selection
- if (_str->readByte() != 63) {
+ if (_stream->readByte() != 63) {
warning("JPEG: Progressive scanning not supported");
return false;
}
// Successive approximation parameters
- if (_str->readByte() != 0) {
+ if (_stream->readByte() != 0) {
warning("JPEG: Progressive scanning not supported");
return false;
}
@@ -459,12 +459,12 @@ bool JPEG::readSOS() {
// Marker 0xDB (Define Quantization Tables)
bool JPEG::readDQT() {
debug(5, "JPEG: readDQT");
- uint16 size = _str->readUint16BE() - 2;
- uint32 pos = _str->pos();
+ uint16 size = _stream->readUint16BE() - 2;
+ uint32 pos = _stream->pos();
- while ((uint32)_str->pos() < (pos + size)) {
+ while ((uint32)_stream->pos() < (pos + size)) {
// Read the table precision and id
- uint8 tableId = _str->readByte();
+ uint8 tableId = _stream->readByte();
bool highPrecision = (tableId & 0xF0) != 0;
// Validate the table id
@@ -480,7 +480,7 @@ bool JPEG::readDQT() {
// Read the table (stored in Zig-Zag order)
for (int i = 0; i < 64; i++)
- _quant[tableId][i] = highPrecision ? _str->readUint16BE() : _str->readByte();
+ _quant[tableId][i] = highPrecision ? _stream->readUint16BE() : _stream->readByte();
}
return true;
@@ -682,12 +682,12 @@ uint8 JPEG::readHuff(uint8 table) {
uint8 JPEG::readBit() {
// Read a whole byte if necessary
if (_bitsNumber == 0) {
- _bitsData = _str->readByte();
+ _bitsData = _stream->readByte();
_bitsNumber = 8;
// Detect markers
if (_bitsData == 0xFF) {
- uint8 byte2 = _str->readByte();
+ uint8 byte2 = _stream->readByte();
// A stuffed 0 validates the previous byte
if (byte2 != 0) {
diff --git a/graphics/jpeg.h b/graphics/jpeg.h
index 4a9ed1a860..d6d031448b 100644
--- a/graphics/jpeg.h
+++ b/graphics/jpeg.h
@@ -55,7 +55,7 @@ public:
private:
void reset();
- Common::SeekableReadStream *_str;
+ Common::SeekableReadStream *_stream;
uint16 _w, _h;
// Image components
@@ -74,7 +74,9 @@ private:
// Result image for this component
Surface surface;
- } *_components;
+ };
+
+ Component *_components;
// Scan components
uint8 _numScanComp;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 08:29:19 +0000