Refactored the ImageData decoding/encoding backends a bit

src/modules/image/magpie/DevilHandler.cpp

@@ -23,15 +23,10 @@
 // LOVE
 #include "common/Exception.h"
 #include "common/math.h"
-#include "thread/threads.h"
 
 // DevIL
 #include <IL/il.h>
 
-using love::thread::Lock;
-
-static Mutex *devilMutex = 0;
-
 namespace love
 {
 namespace image
@@ -44,21 +39,22 @@ static inline void ilxClearErrors()
 	while (ilGetError() != IL_NO_ERROR);
 }
 
-void DevilHandler::init()
+DevilHandler::DevilHandler()
+	: mutex(nullptr)
 {
+	// There should only ever be one DevilHandler object (owned by the Image
+	// module), so we can use the global initialization function here.
 	ilInit();
 	ilEnable(IL_ORIGIN_SET);
 	ilOriginFunc(IL_ORIGIN_UPPER_LEFT);
 }
 
-void DevilHandler::quit()
+DevilHandler::~DevilHandler()
 {
 	ilShutDown();
-	if (devilMutex)
-	{
-		delete devilMutex;
-		devilMutex = 0;
-	}
+
+	if (mutex)
+		delete mutex;
 }
 
 bool DevilHandler::canDecode(love::filesystem::FileData * /*data*/)
@@ -85,10 +81,10 @@ bool DevilHandler::canEncode(ImageData::Format format)
 
 DevilHandler::DecodedImage DevilHandler::decode(love::filesystem::FileData *data)
 {
-	if (!devilMutex)
-		devilMutex = thread::newMutex();
+	if (!mutex)
+		mutex = love::thread::newMutex();
 
-	Lock lock(devilMutex);
+	love::thread::Lock lock(mutex);
 
 	ILuint image = ilGenImage();
 	ilBindImage(image);
@@ -140,10 +136,10 @@ DevilHandler::DecodedImage DevilHandler::decode(love::filesystem::FileData *data
 
 DevilHandler::EncodedImage DevilHandler::encode(const DecodedImage &img, ImageData::Format format)
 {
-	if (!devilMutex)
-		devilMutex = thread::newMutex();
+	if (!mutex)
+		mutex = love::thread::newMutex();
 
-	Lock lock(devilMutex);
+	love::thread::Lock lock(mutex);
 
 	ILuint tempimage = ilGenImage();
 	ilBindImage(tempimage);

src/modules/image/magpie/DevilHandler.h

@@ -24,6 +24,7 @@
 // LOVE
 #include "filesystem/FileData.h"
 #include "FormatHandler.h"
+#include "thread/threads.h"
 
 namespace love
 {
@@ -39,16 +40,20 @@ class DevilHandler : public FormatHandler
 {
 public:
 
-	static void init();
-	static void quit();
-
 	// Implements FormatHandler.
 
-	static bool canDecode(love::filesystem::FileData *data);
-	static bool canEncode(ImageData::Format format);
+	DevilHandler();
+	virtual ~DevilHandler();
 
-	static DecodedImage decode(love::filesystem::FileData *data);
-	static EncodedImage encode(const DecodedImage &img, ImageData::Format format);
+	virtual bool canDecode(love::filesystem::FileData *data);
+	virtual bool canEncode(ImageData::Format format);
+
+	virtual DecodedImage decode(love::filesystem::FileData *data);
+	virtual EncodedImage encode(const DecodedImage &img, ImageData::Format format);
+
+private:
+
+	Mutex *mutex;
 
 }; // DevilHandler
 

src/modules/image/magpie/FormatHandler.cpp

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2006-2014 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+// LOVE
+#include "FormatHandler.h"
+#include "common/Exception.h"
+
+namespace love
+{
+namespace image
+{
+namespace magpie
+{
+
+FormatHandler::FormatHandler()
+{
+}
+
+FormatHandler::~FormatHandler()
+{
+}
+
+bool FormatHandler::canDecode(love::filesystem::FileData* /*data*/)
+{
+	return false;
+}
+
+bool FormatHandler::canEncode(ImageData::Format /*format*/)
+{
+	return false;
+}
+
+FormatHandler::DecodedImage FormatHandler::decode(love::filesystem::FileData* /*data*/)
+{
+	throw love::Exception("Image decoding is not implemented for this format backend.");
+}
+
+FormatHandler::EncodedImage FormatHandler::encode(const DecodedImage& /*img*/, ImageData::Format /*format*/)
+{
+	throw love::Exception("Image encoding is not implemented for this format backend.");
+}
+
+} // magpie
+} // image
+} // love

src/modules/image/magpie/FormatHandler.h

@@ -24,6 +24,7 @@
 // LOVE
 #include "image/ImageData.h"
 #include "filesystem/FileData.h"
+#include "common/Object.h"
 
 namespace love
 {
@@ -34,8 +35,9 @@ namespace magpie
 
 /**
  * Base class for all ImageData encoder/decoder library interfaces.
+ * We inherit from love::Object to take advantage of reference counting...
  **/
-class FormatHandler
+class FormatHandler : public love::Object
 {
 public:
 
@@ -56,26 +58,32 @@ public:
 		EncodedImage() : size(0), data(0) {}
 	};
 
-	// Lets pretend we have virtual static methods...
+	/**
+	 * The default constructor is called when the Image module is initialized.
+	 **/
+	FormatHandler();
 
 	/**
-	 * Determines whether a particular FileData can be decoded by this handler.
-	 * @param data The data to decode.
+	 * The destructor is called when the Image module is uninitialized.
 	 **/
-	// virtual static bool canDecode(love::filesystem::FileData *data) = 0;
+	virtual ~FormatHandler();
 
 	/**
-	 * Determines whether this handler can encode to a particular format.
-	 * @param format The format to encode to.
+	 * Whether this format handler can decode a particular FileData.
 	 **/
-	// virtual static bool canEncode(ImageData::Format format) = 0;
+	virtual bool canDecode(love::filesystem::FileData *data);
+
+	/**
+	 * Whether this format handler can encode to a particular format.
+	 **/
+	virtual bool canEncode(ImageData::Format format);
 
 	/**
 	 * Decodes an image from its encoded form into raw pixel data.
 	 * @param data The encoded data to decode.
 	 * @return The decoded pixel data.
 	 **/
-	// virtual static DecodedImage decode(love::filesystem::FileData *data) = 0;
+	virtual DecodedImage decode(love::filesystem::FileData *data);
 
 	/**
 	 * Encodes an image from raw pixel data into a particular format.
@@ -83,7 +91,7 @@ public:
 	 * @param format The format to encode to.
 	 * @return The encoded image data.
 	 **/
-	// virtual static EncodedImage encode(const DecodedImage &img, ImageData::Format format) = 0;
+	virtual EncodedImage encode(const DecodedImage &img, ImageData::Format format);
 
 }; // FormatHandler
 

src/modules/image/magpie/Image.cpp

@@ -34,12 +34,15 @@ namespace magpie
 
 Image::Image()
 {
-	DevilHandler::init();
+	formatHandlers.push_back(new DevilHandler);
 }
 
 Image::~Image()
 {
-	DevilHandler::quit();
+	// ImageData objects reference the FormatHandlers in our list, so we should
+	// release them instead of deleting them completely here.
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		(*it)->release();
 }
 
 const char *Image::getName() const
@@ -49,17 +52,17 @@ const char *Image::getName() const
 
 love::image::ImageData *Image::newImageData(love::filesystem::FileData *data)
 {
-	return new ImageData(data);
+	return new ImageData(formatHandlers, data);
 }
 
 love::image::ImageData *Image::newImageData(int width, int height)
 {
-	return new ImageData(width, height);
+	return new ImageData(formatHandlers, width, height);
 }
 
 love::image::ImageData *Image::newImageData(int width, int height, void *data, bool own)
 {
-	return new ImageData(width, height, data, own);
+	return new ImageData(formatHandlers, width, height, data, own);
 }
 
 love::image::CompressedData *Image::newCompressedData(love::filesystem::FileData *data)

src/modules/image/magpie/Image.h

@@ -23,6 +23,10 @@
 
 // LOVE
 #include "image/Image.h"
+#include "FormatHandler.h"
+
+// C++
+#include <list>
 
 namespace love
 {
@@ -54,6 +58,11 @@ public:
 
 	bool isCompressed(love::filesystem::FileData *data);
 
+private:
+
+	// Image format handlers we can use for decoding and encoding ImageData.
+	std::list<FormatHandler *> formatHandlers;
+
 }; // Image
 
 } // magpie

src/modules/image/magpie/ImageData.cpp

@@ -18,11 +18,9 @@
  * 3. This notice may not be removed or altered from any source distribution.
  **/
 
+// LOVE
 #include "ImageData.h"
 
-#include "FormatHandler.h"
-#include "DevilHandler.h"
-
 namespace love
 {
 namespace image
@@ -30,23 +28,36 @@ namespace image
 namespace magpie
 {
 
-ImageData::ImageData(love::filesystem::FileData *data)
+ImageData::ImageData(std::list<FormatHandler *> formats, love::filesystem::FileData *data)
+	: formatHandlers(formats)
 {
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		(*it)->retain();
+
 	decode(data);
 }
 
-ImageData::ImageData(int width, int height)
+ImageData::ImageData(std::list<FormatHandler *> formats, int width, int height)
+	: formatHandlers(formats)
 {
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		(*it)->retain();
+
 	this->width = width;
 	this->height = height;
+
 	create(width, height);
 
 	// Set to black/transparency.
 	memset(data, 0, width*height*sizeof(pixel));
 }
 
-ImageData::ImageData(int width, int height, void *data, bool own)
+ImageData::ImageData(std::list<FormatHandler *> formats, int width, int height, void *data, bool own)
+	: formatHandlers(formats)
 {
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		(*it)->retain();
+
 	this->width = width;
 	this->height = height;
 
@@ -59,6 +70,9 @@ ImageData::ImageData(int width, int height, void *data, bool own)
 ImageData::~ImageData()
 {
 	delete[] data;
+
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		(*it)->release();
 }
 
 void ImageData::create(int width, int height, void *data)
@@ -80,16 +94,23 @@ void ImageData::decode(love::filesystem::FileData *data)
 {
 	FormatHandler::DecodedImage decodedimage;
 
-	if (DevilHandler::canDecode(data))
-		decodedimage = DevilHandler::decode(data);
-	else
+	for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+	{
+		if ((*it)->canDecode(data))
+		{
+			decodedimage = (*it)->decode(data);
+			break;
+		}
+	}
+
+	if (decodedimage.data == nullptr)
 		throw love::Exception("Could not decode image: unrecognized format.");
 
 	// The decoder *must* output a 32 bits-per-pixel image.
 	if (decodedimage.size != decodedimage.width*decodedimage.height*sizeof(pixel))
 	{
 		delete[] decodedimage.data;
-		throw love::Exception("Coult not convert image!");
+		throw love::Exception("Could not convert image!");
 	}
 
 	if (this->data)
@@ -114,15 +135,21 @@ void ImageData::encode(love::filesystem::File *f, ImageData::Format format)
 		rawimage.size = width*height*sizeof(pixel);
 		rawimage.data = data;
 
-		if (DevilHandler::canEncode(format))
-			encodedimage = DevilHandler::encode(rawimage, format);
-		else
+		for (auto it = formatHandlers.begin(); it != formatHandlers.end(); ++it)
+		{
+			if ((*it)->canEncode(format))
+			{
+				encodedimage = (*it)->encode(rawimage, format);
+				break;
+			}
+		}
+
+		if (encodedimage.data == nullptr)
 			throw love::Exception("Image format has no suitable encoder.");
 	}
 
 	try
 	{
-		
 		f->open(love::filesystem::File::WRITE);
 		f->write(encodedimage.data, encodedimage.size);
 		f->close();

src/modules/image/magpie/ImageData.h

@@ -22,9 +22,13 @@
 #define LOVE_IMAGE_MAGPIE_IMAGE_DATA_H
 
 // LOVE
+#include "FormatHandler.h"
 #include "filesystem/File.h"
 #include "image/ImageData.h"
 
+// C++
+#include <list>
+
 namespace love
 {
 namespace image
@@ -36,9 +40,9 @@ class ImageData : public love::image::ImageData
 {
 public:
 
-	ImageData(love::filesystem::FileData *data);
-	ImageData(int width, int height);
-	ImageData(int width, int height, void *data, bool own);
+	ImageData(std::list<FormatHandler *> formats, love::filesystem::FileData *data);
+	ImageData(std::list<FormatHandler *> formats, int width, int height);
+	ImageData(std::list<FormatHandler *> formats, int width, int height, void *data, bool own);
 	virtual ~ImageData();
 
 	// Implements image::ImageData.
@@ -52,6 +56,9 @@ private:
 	// Decode and load an encoded format.
 	void decode(love::filesystem::FileData *data);
 
+	// Image format handlers we can use for decoding and encoding.
+	std::list<FormatHandler *> formatHandlers;
+
 }; // ImageData
 
 } // magpie