Fix 8bit grey image TGAs, which were not working due to missing palette. Also...

Fix 8bit grey image TGAs, which were not working due to missing palette. Also switched to RGB8 format, as otherwise a loss in precision would occur. Thanks to Klunk for the error report and a test image.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4160 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CImageLoaderTGA.cpp

@@ -166,15 +166,29 @@ IImage* CImageLoaderTGA::loadImage(io::IReadFile* file) const
 	switch(header.PixelDepth)
 	{
 	case 8:
+		{
+			if (header.ImageType==3) // grey image
+			{
+				image = new CImage(ECF_R8G8B8,
+					core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
+				if (image)
+					CColorConverter::convert8BitTo24Bit((u8*)data,
+						(u8*)image->lock(),
+						header.ImageWidth,header.ImageHeight,
+						0, 0, (header.ImageDescriptor&0x20)==0);
+			}
+			else
+			{
 				image = new CImage(ECF_A1R5G5B5,
 					core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
 				if (image)
 					CColorConverter::convert8BitTo16Bit((u8*)data,
 						(s16*)image->lock(),
 						header.ImageWidth,header.ImageHeight,
-				header.ImageType == 3 ? 0 : (s32*) palette,
-				0,
+						(s32*) palette, 0,
 						(header.ImageDescriptor&0x20)==0);
+			}
+		}
 		break;
 	case 16:
 		image = new CImage(ECF_A1R5G5B5,

tests/createImage.cpp

@@ -2,7 +2,9 @@
 
 using namespace irr;
 
-static bool testImageCreation()
+namespace
+{
+bool testImageCreation()
 {
 	// create device
 
@@ -39,8 +41,35 @@ static bool testImageCreation()
 	return result;
 }
 
+bool testImageFormats()
+{
+	IrrlichtDevice *device = createDevice(video::EDT_BURNINGSVIDEO, core::dimension2d<u32>(256,128));
+
+	if (device == 0)
+		return true; // could not create selected driver.
+
+	video::IVideoDriver* driver = device->getVideoDriver();
+	video::ITexture* tex=driver->getTexture("../media/water.jpg");
+	video::ITexture* tex1=driver->getTexture("media/grey.tga");
+	driver->beginScene(true, true);
+
+	driver->draw2DImage(tex, core::position2d<s32>(0,0), core::recti(0,0,64,64));
+	driver->draw2DImage(tex1, core::position2d<s32>(0,64), core::recti(0,0,64,64));
+	driver->endScene();
+
+	bool result = takeScreenshotAndCompareAgainstReference(driver, "-testImageFormats.png", 99.5f);
+
+	device->closeDevice();
+	device->run();
+	device->drop();
+
+	return result;
+}
+}
+
 bool createImage()
 {
 	bool result = testImageCreation();
+	result &= testImageFormats();
 	return result;
 }