VIDEO: Make Codec::decodeImage() return a const Surface pointer

svn-id: r54930

23 files changed, 24 insertions, 24 deletions

diff --git a/graphics/video/avi_decoder.cpp b/graphics/video/avi_decoder.cpp
index c1346bbe12..ed0b063147 100644
--- a/graphics/video/avi_decoder.cpp
+++ b/graphics/video/avi_decoder.cpp
@@ -357,7 +357,7 @@ const Surface *AviDecoder::decodeNextFrame() {
 			return NULL;
 
 		Common::SeekableReadStream *frameData = _fileStream->readStream(chunkSize);
-		Graphics::Surface *surface = _videoCodec->decodeImage(frameData);
+		const Graphics::Surface *surface = _videoCodec->decodeImage(frameData);
 		delete frameData;
 		_fileStream->skip(chunkSize & 1); // Alignment
 		return surface;
diff --git a/graphics/video/codecs/cinepak.cpp b/graphics/video/codecs/cinepak.cpp
index b6903cf201..3264810908 100644
--- a/graphics/video/codecs/cinepak.cpp
+++ b/graphics/video/codecs/cinepak.cpp
@@ -68,7 +68,7 @@ CinepakDecoder::~CinepakDecoder() {
 	delete[] _curFrame.strips;
 }
 
-Surface *CinepakDecoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *CinepakDecoder::decodeImage(Common::SeekableReadStream *stream) {
 	_curFrame.flags = stream->readByte();
 	_curFrame.length = (stream->readByte() << 16) + stream->readUint16BE();
 	_curFrame.width = stream->readUint16BE();
diff --git a/graphics/video/codecs/cinepak.h b/graphics/video/codecs/cinepak.h
index 0c42cbbb97..b1daece1f3 100644
--- a/graphics/video/codecs/cinepak.h
+++ b/graphics/video/codecs/cinepak.h
@@ -64,7 +64,7 @@ public:
 	CinepakDecoder(int bitsPerPixel = 24);
 	~CinepakDecoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return _pixelFormat; }
 
 private:
diff --git a/graphics/video/codecs/codec.h b/graphics/video/codecs/codec.h
index 802671a037..565faf8442 100644
--- a/graphics/video/codecs/codec.h
+++ b/graphics/video/codecs/codec.h
@@ -40,7 +40,7 @@ public:
 	Codec() {}
 	virtual ~Codec() {}
 
-	virtual Surface *decodeImage(Common::SeekableReadStream *stream) = 0;
+	virtual const Surface *decodeImage(Common::SeekableReadStream *stream) = 0;
 	virtual PixelFormat getPixelFormat() const = 0;
 };
 
diff --git a/graphics/video/codecs/indeo3.cpp b/graphics/video/codecs/indeo3.cpp
index 443340de2f..51e946a75b 100644
--- a/graphics/video/codecs/indeo3.cpp
+++ b/graphics/video/codecs/indeo3.cpp
@@ -168,7 +168,7 @@ void Indeo3Decoder::allocFrames() {
 	}
 }
 
-Surface *Indeo3Decoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *Indeo3Decoder::decodeImage(Common::SeekableReadStream *stream) {
 	// Not Indeo 3? Fail
 	if (!isIndeo3(*stream))
 		return 0;
diff --git a/graphics/video/codecs/indeo3.h b/graphics/video/codecs/indeo3.h
index 319a8e5d42..d074facea2 100644
--- a/graphics/video/codecs/indeo3.h
+++ b/graphics/video/codecs/indeo3.h
@@ -46,7 +46,7 @@ public:
 	Indeo3Decoder(uint16 width, uint16 height);
 	~Indeo3Decoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const;
 
 	static bool isIndeo3(Common::SeekableReadStream &stream);
diff --git a/graphics/video/codecs/mjpeg.cpp b/graphics/video/codecs/mjpeg.cpp
index 76363036ee..1efaa6ac19 100644
--- a/graphics/video/codecs/mjpeg.cpp
+++ b/graphics/video/codecs/mjpeg.cpp
@@ -45,7 +45,7 @@ JPEGDecoder::~JPEGDecoder() {
 	}
 }
 
-Surface *JPEGDecoder::decodeImage(Common::SeekableReadStream* stream) {
+const Surface *JPEGDecoder::decodeImage(Common::SeekableReadStream* stream) {
 	_jpeg->read(stream);
 	Surface *ySurface = _jpeg->getComponent(1);
 	Surface *uSurface = _jpeg->getComponent(2);
diff --git a/graphics/video/codecs/mjpeg.h b/graphics/video/codecs/mjpeg.h
index 8b0a03609b..daa8b12dbb 100644
--- a/graphics/video/codecs/mjpeg.h
+++ b/graphics/video/codecs/mjpeg.h
@@ -43,7 +43,7 @@ public:
 	JPEGDecoder();
 	~JPEGDecoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return _pixelFormat; }
 
 private:
diff --git a/graphics/video/codecs/msrle.cpp b/graphics/video/codecs/msrle.cpp
index f7dcaf7467..a3929fc1fd 100644
--- a/graphics/video/codecs/msrle.cpp
+++ b/graphics/video/codecs/msrle.cpp
@@ -41,7 +41,7 @@ MSRLEDecoder::~MSRLEDecoder() {
 	delete _surface;
 }
 
-Surface *MSRLEDecoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *MSRLEDecoder::decodeImage(Common::SeekableReadStream *stream) {
 	if (_bitsPerPixel == 8) {
 		decode8(stream);
 	} else
diff --git a/graphics/video/codecs/msrle.h b/graphics/video/codecs/msrle.h
index 819e66a0bd..02b9199e4e 100644
--- a/graphics/video/codecs/msrle.h
+++ b/graphics/video/codecs/msrle.h
@@ -35,7 +35,7 @@ public:
 	MSRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel);
 	~MSRLEDecoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return PixelFormat::createFormatCLUT8(); }
 
 private:
diff --git a/graphics/video/codecs/msvideo1.cpp b/graphics/video/codecs/msvideo1.cpp
index 8cb1e75058..176efc037f 100644
--- a/graphics/video/codecs/msvideo1.cpp
+++ b/graphics/video/codecs/msvideo1.cpp
@@ -126,7 +126,7 @@ void MSVideo1Decoder::decode8(Common::SeekableReadStream *stream) {
     }
 }
 
-Surface *MSVideo1Decoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *MSVideo1Decoder::decodeImage(Common::SeekableReadStream *stream) {
 	if (_bitsPerPixel == 8)
 		decode8(stream);
 	else {
diff --git a/graphics/video/codecs/msvideo1.h b/graphics/video/codecs/msvideo1.h
index e07267476d..1b908a6243 100644
--- a/graphics/video/codecs/msvideo1.h
+++ b/graphics/video/codecs/msvideo1.h
@@ -35,7 +35,7 @@ public:
 	MSVideo1Decoder(uint16 width, uint16 height, byte bitsPerPixel);
 	~MSVideo1Decoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return PixelFormat::createFormatCLUT8(); }
 
 private:
diff --git a/graphics/video/codecs/qtrle.cpp b/graphics/video/codecs/qtrle.cpp
index 3e3fd4cfce..e73d193896 100644
--- a/graphics/video/codecs/qtrle.cpp
+++ b/graphics/video/codecs/qtrle.cpp
@@ -354,7 +354,7 @@ void QTRLEDecoder::decode32(Common::SeekableReadStream *stream, uint32 rowPtr, u
 	}
 }
 
-Surface *QTRLEDecoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *QTRLEDecoder::decodeImage(Common::SeekableReadStream *stream) {
 	uint16 start_line = 0;
 	uint16 height = _surface->h;
 
diff --git a/graphics/video/codecs/qtrle.h b/graphics/video/codecs/qtrle.h
index efbef14411..f0d2587f30 100644
--- a/graphics/video/codecs/qtrle.h
+++ b/graphics/video/codecs/qtrle.h
@@ -36,7 +36,7 @@ public:
 	QTRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel);
 	~QTRLEDecoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return _pixelFormat; }
 
 private:
diff --git a/graphics/video/codecs/rpza.cpp b/graphics/video/codecs/rpza.cpp
index 050f2a5bcf..7212aba64c 100644
--- a/graphics/video/codecs/rpza.cpp
+++ b/graphics/video/codecs/rpza.cpp
@@ -69,7 +69,7 @@ RPZADecoder::RPZADecoder(uint16 width, uint16 height) : Codec() {
 	} \
 	blockPtr++
 
-Surface *RPZADecoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *RPZADecoder::decodeImage(Common::SeekableReadStream *stream) {
 	uint16 colorA = 0, colorB = 0;
 	uint16 color4[4];
 
diff --git a/graphics/video/codecs/rpza.h b/graphics/video/codecs/rpza.h
index e6d32feb72..7a5f2033eb 100644
--- a/graphics/video/codecs/rpza.h
+++ b/graphics/video/codecs/rpza.h
@@ -36,7 +36,7 @@ public:
 	RPZADecoder(uint16 width, uint16 height);
 	~RPZADecoder() { delete _surface; }
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return _pixelFormat; }
 
 private:
diff --git a/graphics/video/codecs/smc.cpp b/graphics/video/codecs/smc.cpp
index 425922435d..2f75f5f21e 100644
--- a/graphics/video/codecs/smc.cpp
+++ b/graphics/video/codecs/smc.cpp
@@ -52,7 +52,7 @@ SMCDecoder::SMCDecoder(uint16 width, uint16 height) {
 	_surface->create(width, height, 1);
 }
 
-Graphics::Surface *SMCDecoder::decodeImage(Common::SeekableReadStream *stream) {
+const Graphics::Surface *SMCDecoder::decodeImage(Common::SeekableReadStream *stream) {
 	byte *pixels = (byte *)_surface->pixels;
 
 	uint32 numBlocks = 0;
diff --git a/graphics/video/codecs/smc.h b/graphics/video/codecs/smc.h
index 2d4355a83e..c2ade00141 100644
--- a/graphics/video/codecs/smc.h
+++ b/graphics/video/codecs/smc.h
@@ -42,7 +42,7 @@ public:
 	SMCDecoder(uint16 width, uint16 height);
 	~SMCDecoder() { delete _surface; }
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 	PixelFormat getPixelFormat() const { return PixelFormat::createFormatCLUT8(); }
 
 private:
diff --git a/graphics/video/codecs/truemotion1.cpp b/graphics/video/codecs/truemotion1.cpp
index fde9f5c2c8..d244014fff 100644
--- a/graphics/video/codecs/truemotion1.cpp
+++ b/graphics/video/codecs/truemotion1.cpp
@@ -395,7 +395,7 @@ void TrueMotion1Decoder::decode16() {
 	}
 }
 
-Surface *TrueMotion1Decoder::decodeImage(Common::SeekableReadStream *stream) {
+const Surface *TrueMotion1Decoder::decodeImage(Common::SeekableReadStream *stream) {
 	decodeHeader(stream);
 
 	if (compressionTypes[_header.compression].algorithm == ALGO_NOP)
diff --git a/graphics/video/codecs/truemotion1.h b/graphics/video/codecs/truemotion1.h
index 0e77ec3e26..ab8fb221f8 100644
--- a/graphics/video/codecs/truemotion1.h
+++ b/graphics/video/codecs/truemotion1.h
@@ -40,7 +40,7 @@ public:
 	TrueMotion1Decoder(uint16 width, uint16 height);
 	~TrueMotion1Decoder();
 
-	Surface *decodeImage(Common::SeekableReadStream *stream);
+	const Surface *decodeImage(Common::SeekableReadStream *stream);
 
 	// Always return RGB565
 	PixelFormat getPixelFormat() const { return Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0); }
diff --git a/graphics/video/coktel_decoder.cpp b/graphics/video/coktel_decoder.cpp
index e26ec33048..d6ad6327e0 100644
--- a/graphics/video/coktel_decoder.cpp
+++ b/graphics/video/coktel_decoder.cpp
@@ -2093,7 +2093,7 @@ bool VMDDecoder::renderFrame(Common::Rect &rect) {
 			return false;
 
 		Common::MemoryReadStream frameStream(_frameData, _frameDataLen);
-		Surface *codecSurf = _codec->decodeImage(&frameStream);
+		const Surface *codecSurf = _codec->decodeImage(&frameStream);
 		if (!codecSurf)
 			return false;
 
diff --git a/graphics/video/qt_decoder.cpp b/graphics/video/qt_decoder.cpp
index b8dc4c3d11..2e18050db1 100644
--- a/graphics/video/qt_decoder.cpp
+++ b/graphics/video/qt_decoder.cpp
@@ -242,7 +242,7 @@ const Surface *QuickTimeDecoder::decodeNextFrame() {
 	if (!entry->videoCodec)
 		return 0;
 
-	Surface *frame = entry->videoCodec->decodeImage(frameData);
+	const Surface *frame = entry->videoCodec->decodeImage(frameData);
 	delete frameData;
 
 	// Update the palette in case it changes between video descriptions
@@ -256,7 +256,7 @@ const Surface *QuickTimeDecoder::decodeNextFrame() {
 	return scaleSurface(frame);
 }
 
-Surface *QuickTimeDecoder::scaleSurface(Surface *frame) {
+const Surface *QuickTimeDecoder::scaleSurface(const Surface *frame) {
 	if (getScaleFactorX() == 1 && getScaleFactorY() == 1)
 		return frame;
 
diff --git a/graphics/video/qt_decoder.h b/graphics/video/qt_decoder.h
index fcb75bb4f0..b56aaebdeb 100644
--- a/graphics/video/qt_decoder.h
+++ b/graphics/video/qt_decoder.h
@@ -251,7 +251,7 @@ private:
 	int8 _videoStreamIndex;
 
 	Surface *_scaledSurface;
-	Surface *scaleSurface(Surface *frame);
+	const Surface *scaleSurface(const Surface *frame);
 	Common::Rational getScaleFactorX() const;
 	Common::Rational getScaleFactorY() const;