- swapped the image source implementations with GZDoom's.

source/core/textures/formats/arttexture.cpp

@@ -41,7 +41,7 @@
 
 #include "build.h"
 
-
+#if 0
 //==========================================================================
 //
 // an AET texture
@@ -172,3 +172,4 @@ int FArtTexture::CopyPixels(FBitmap *bmp, int conversion)
 	return 0;
 }	 
 
+#endif

source/core/textures/formats/ddstexture.cpp

@@ -163,9 +163,9 @@ class FDDSTexture : public FImageSource
 		PIX_ARGB = 2
 	};
 public:
-	FDDSTexture (FileReader &lump, void *surfdesc);
+	FDDSTexture (FileReader &lump, int lumpnum, void *surfdesc);
 
-	void CreatePalettedPixels(uint8_t *destbuffer) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 
 protected:
 	uint32_t Format;
@@ -219,7 +219,7 @@ static bool CheckDDS (FileReader &file)
 //
 //==========================================================================
 
-FImageSource *DDSImage_TryCreate (FileReader &data)
+FImageSource *DDSImage_TryCreate (FileReader &data, int lumpnum)
 {
 	union
 	{
@@ -274,7 +274,7 @@ FImageSource *DDSImage_TryCreate (FileReader &data)
 	{
 		return NULL;
 	}
-	return new FDDSTexture (data, &surfdesc);
+	return new FDDSTexture (data, lumpnum, &surfdesc);
 }
 
 //==========================================================================
@@ -283,7 +283,8 @@ FImageSource *DDSImage_TryCreate (FileReader &data)
 //
 //==========================================================================
 
-FDDSTexture::FDDSTexture (FileReader &lump, void *vsurfdesc)
+FDDSTexture::FDDSTexture (FileReader &lump, int lumpnum, void *vsurfdesc)
+: FImageSource(lumpnum)
 {
 	DDSURFACEDESC2 *surf = (DDSURFACEDESC2 *)vsurfdesc;
 
@@ -372,30 +373,32 @@ void FDDSTexture::CalcBitShift (uint32_t mask, uint8_t *lshiftp, uint8_t *rshift
 //
 //==========================================================================
 
-void FDDSTexture::CreatePalettedPixels(uint8_t *buffer)
+TArray<uint8_t> FDDSTexture::CreatePalettedPixels(int conversion)
 {
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return;	// Just leave the texture blank.
+
+	TArray<uint8_t> Pixels(Width*Height, true);
 
 	lump.Seek (sizeof(DDSURFACEDESC2) + 4, FileReader::SeekSet);
 
-	int pmode = PIX_Palette;
+	int pmode = conversion == luminance ? PIX_Alphatex : PIX_Palette;
 	if (Format >= 1 && Format <= 4)		// RGB: Format is # of bytes per pixel
 	{
-		ReadRGB (lump, buffer, pmode);
+		ReadRGB (lump, Pixels.Data(), pmode);
 	}
 	else if (Format == ID_DXT1)
 	{
-		DecompressDXT1 (lump, buffer, pmode);
+		DecompressDXT1 (lump, Pixels.Data(), pmode);
 	}
 	else if (Format == ID_DXT3 || Format == ID_DXT2)
 	{
-		DecompressDXT3 (lump, Format == ID_DXT2, buffer, pmode);
+		DecompressDXT3 (lump, Format == ID_DXT2, Pixels.Data(), pmode);
 	}
 	else if (Format == ID_DXT5 || Format == ID_DXT4)
 	{
-		DecompressDXT5 (lump, Format == ID_DXT4, buffer, pmode);
+		DecompressDXT5 (lump, Format == ID_DXT4, Pixels.Data(), pmode);
 	}
+	return Pixels;
 }
 
 //==========================================================================
@@ -442,7 +445,7 @@ void FDDSTexture::ReadRGB (FileReader &lump, uint8_t *buffer, int pixelmode)
 					uint32_t g = (c & GMask) << GShiftL; g |= g >> GShiftR;
 					uint32_t b = (c & BMask) << BShiftL; b |= b >> BShiftR;
 					uint32_t a = (c & AMask) << AShiftL; a |= a >> AShiftR;
-					*pixelp = ImageHelpers::RGBToPalette(false, r >> 24, g >> 24, b >> 24, a >> 24);
+					*pixelp = ImageHelpers::RGBToPalette(pixelmode == PIX_Alphatex, r >> 24, g >> 24, b >> 24, a >> 24);
 				}
 				else
 				{
@@ -781,8 +784,7 @@ void FDDSTexture::DecompressDXT5 (FileReader &lump, bool premultiplied, uint8_t
 
 int FDDSTexture::CopyPixels(FBitmap *bmp, int conversion)
 {
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return -1;	// Just leave the texture blank.
 
 	uint8_t *TexBuffer = bmp->GetPixels();
 

source/core/textures/formats/jpegtexture.cpp

@@ -35,20 +35,18 @@
 */
 
 #include <stdio.h>
-
-#include "files.h"
-#include "printf.h"
-#include "bitmap.h"
-#include "image.h"
-#include "filesystem.h"
-#include "imagehelpers.h"
-#include "v_text.h"
-
 extern "C"
 {
 #include <jpeglib.h>
 }
 
+#include "files.h"
+#include "filesystem.h"
+#include "printf.h"
+#include "bitmap.h"
+#include "imagehelpers.h"
+#include "image.h"
+
 
 struct FLumpSourceMgr : public jpeg_source_mgr
 {
@@ -184,10 +182,10 @@ void JPEG_OutputMessage (j_common_ptr cinfo)
 class FJPEGTexture : public FImageSource
 {
 public:
-	FJPEGTexture (int width, int height);
+	FJPEGTexture (int lumpnum, int width, int height);
 
-	void CreatePalettedPixels(uint8_t* destbuffer) override;
 	int CopyPixels(FBitmap *bmp, int conversion) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 };
 
 //==========================================================================
@@ -196,7 +194,7 @@ public:
 //
 //==========================================================================
 
-FImageSource *JPEGImage_TryCreate(FileReader & data)
+FImageSource *JPEGImage_TryCreate(FileReader & data, int lumpnum)
 {
 	union
 	{
@@ -237,7 +235,7 @@ FImageSource *JPEGImage_TryCreate(FileReader & data)
 	{
 		return NULL;
 	}
-	return new FJPEGTexture (BigShort(first4bytes.w[1]), BigShort(first4bytes.w[0]));
+	return new FJPEGTexture (lumpnum, BigShort(first4bytes.w[1]), BigShort(first4bytes.w[0]));
 }
 
 //==========================================================================
@@ -246,7 +244,8 @@ FImageSource *JPEGImage_TryCreate(FileReader & data)
 //
 //==========================================================================
 
-FJPEGTexture::FJPEGTexture (int width, int height)
+FJPEGTexture::FJPEGTexture (int lumpnum, int width, int height)
+: FImageSource(lumpnum)
 {
 	bMasked = false;
 
@@ -260,10 +259,9 @@ FJPEGTexture::FJPEGTexture (int width, int height)
 //
 //==========================================================================
 
-void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
+TArray<uint8_t> FJPEGTexture::CreatePalettedPixels(int conversion)
 {
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return;	// Just leave the texture blank.
 	JSAMPLE *buff = NULL;
 
 	jpeg_decompress_struct cinfo;
@@ -280,13 +278,14 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 	FLumpSourceMgr sourcemgr(&lump, &cinfo);
 	try
 	{
+		bool doalpha = conversion == luminance;
 		jpeg_read_header(&cinfo, TRUE);
 		if (!((cinfo.out_color_space == JCS_RGB && cinfo.num_components == 3) ||
 			(cinfo.out_color_space == JCS_CMYK && cinfo.num_components == 4) ||
 			(cinfo.out_color_space == JCS_YCbCr && cinfo.num_components == 3) ||
 			(cinfo.out_color_space == JCS_GRAYSCALE && cinfo.num_components == 1)))
 		{
-			Printf(TEXTCOLOR_ORANGE "Unsupported color format in %s\n", Name.GetChars());
+			Printf(TEXTCOLOR_ORANGE "Unsupported color format in %s\n", fileSystem.GetFileFullPath(SourceLump).GetChars());
 		}
 		else
 		{
@@ -305,7 +304,7 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 				case JCS_RGB:
 					for (int x = Width; x > 0; --x)
 					{
-						*out = ImageHelpers::RGBToPalette(false, in[0], in[1], in[2]);
+						*out = ImageHelpers::RGBToPalette(doalpha, in[0], in[1], in[2]);
 						out += Height;
 						in += 3;
 					}
@@ -313,7 +312,7 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 
 				case JCS_GRAYSCALE:
 				{
-					auto remap = GPalette.GrayMap;
+					auto remap = ImageHelpers::GetRemap(doalpha, true);
 					for (int x = Width; x > 0; --x)
 					{
 						*out = remap[in[0]];
@@ -331,7 +330,7 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 						int r = in[3] - (((256 - in[0])*in[3]) >> 8);
 						int g = in[3] - (((256 - in[1])*in[3]) >> 8);
 						int b = in[3] - (((256 - in[2])*in[3]) >> 8);
-						*out = ImageHelpers::RGBToPalette(false, r, g, b);
+						*out = ImageHelpers::RGBToPalette(doalpha, r, g, b);
 						out += Height;
 						in += 4;
 					}
@@ -345,7 +344,7 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 						int r = clamp((int)(Y + 1.40200 * (Cr - 0x80)), 0, 255);
 						int g = clamp((int)(Y - 0.34414 * (Cb - 0x80) - 0.71414 * (Cr - 0x80)), 0, 255);
 						int b = clamp((int)(Y + 1.77200 * (Cb - 0x80)), 0, 255);
-						*out = ImageHelpers::RGBToPalette(false, r, g, b);
+						*out = ImageHelpers::RGBToPalette(doalpha, r, g, b);
 						out += Height;
 						in += 4;
 					}
@@ -363,13 +362,14 @@ void FJPEGTexture::CreatePalettedPixels(uint8_t *buffer)
 	}
 	catch (int)
 	{
-		Printf(TEXTCOLOR_ORANGE "JPEG error in %s\n", Name.GetChars());
+		Printf(TEXTCOLOR_ORANGE "JPEG error in %s\n", fileSystem.GetFileFullPath(SourceLump).GetChars());
 	}
 	jpeg_destroy_decompress(&cinfo);
 	if (buff != NULL)
 	{
 		delete[] buff;
 	}
+	return Pixels;
 }
 
 
@@ -385,8 +385,7 @@ int FJPEGTexture::CopyPixels(FBitmap *bmp, int conversion)
 {
 	PalEntry pe[256];
 
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return -1;	// Just leave the texture blank.
 
 	jpeg_decompress_struct cinfo;
 	jpeg_error_mgr jerr;
@@ -406,7 +405,7 @@ int FJPEGTexture::CopyPixels(FBitmap *bmp, int conversion)
 			(cinfo.out_color_space == JCS_YCbCr && cinfo.num_components == 3) ||
 			(cinfo.out_color_space == JCS_GRAYSCALE && cinfo.num_components == 1)))
 		{
-			Printf(TEXTCOLOR_ORANGE "Unsupported color format in %s\n", Name.GetChars());
+			Printf(TEXTCOLOR_ORANGE "Unsupported color format in %s\n", fileSystem.GetFileFullPath(SourceLump).GetChars());
 		}
 		else
 		{
@@ -454,7 +453,7 @@ int FJPEGTexture::CopyPixels(FBitmap *bmp, int conversion)
 	}
 	catch (int)
 	{
-		Printf(TEXTCOLOR_ORANGE "JPEG error in %s\n", Name.GetChars());
+		Printf(TEXTCOLOR_ORANGE "JPEG error in %s\n", fileSystem.GetFileFullPath(SourceLump).GetChars());
 	}
 	jpeg_destroy_decompress(&cinfo);
 	return 0;

source/core/textures/formats/pcxtexture.cpp

@@ -34,12 +34,11 @@
 **
 */
 
-#include "basics.h"
 #include "files.h"
+#include "filesystem.h"
 #include "bitmap.h"
 #include "imagehelpers.h"
 #include "image.h"
-#include "filesystem.h"
 
 //==========================================================================
 //
@@ -82,7 +81,7 @@ struct PCXHeader
 class FPCXTexture : public FImageSource
 {
 public:
-	FPCXTexture (PCXHeader &);
+	FPCXTexture (int lumpnum, PCXHeader &);
 
 	int CopyPixels(FBitmap *bmp, int conversion) override;
 
@@ -92,7 +91,7 @@ protected:
 	void ReadPCX8bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr);
 	void ReadPCX24bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr, int planes);
 
-	void CreatePalettedPixels(uint8_t *destbuffer) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 };
 
 
@@ -102,7 +101,7 @@ protected:
 //
 //==========================================================================
 
-FImageSource * PCXImage_TryCreate(FileReader & file)
+FImageSource * PCXImage_TryCreate(FileReader & file, int lumpnum)
 {
 	PCXHeader hdr;
 
@@ -131,7 +130,7 @@ FImageSource * PCXImage_TryCreate(FileReader & file)
 	file.Seek(0, FileReader::SeekSet);
 	file.Read(&hdr, sizeof(hdr));
 
-	return new FPCXTexture(hdr);
+	return new FPCXTexture(lumpnum, hdr);
 }
 
 //==========================================================================
@@ -140,7 +139,8 @@ FImageSource * PCXImage_TryCreate(FileReader & file)
 //
 //==========================================================================
 
-FPCXTexture::FPCXTexture(PCXHeader & hdr)
+FPCXTexture::FPCXTexture(int lumpnum, PCXHeader & hdr)
+: FImageSource(lumpnum)
 {
 	bMasked = false;
 	Width = LittleShort(hdr.xmax) - LittleShort(hdr.xmin) + 1;
@@ -344,19 +344,20 @@ void FPCXTexture::ReadPCX24bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr
 //
 //==========================================================================
 
-void FPCXTexture::CreatePalettedPixels(uint8_t *buffer)
+TArray<uint8_t> FPCXTexture::CreatePalettedPixels(int conversion)
 {
 	uint8_t PaletteMap[256];
 	PCXHeader header;
 	int bitcount;
 
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader(SourceLump);
-	if (!lump.isOpen()) return;	// Just leave the texture blank.
 
 	lump.Read(&header, sizeof(header));
 
 	bitcount = header.bitsPerPixel * header.numColorPlanes;
+	TArray<uint8_t> Pixels(Width*Height, true);
 
+	bool alphatex = conversion == luminance;
 	if (bitcount < 24)
 	{
 		if (bitcount < 8)
@@ -365,17 +366,17 @@ void FPCXTexture::CreatePalettedPixels(uint8_t *buffer)
 			{
 			default:
 			case 1:
-				PaletteMap[0] = GPalette.GrayMap[0];
+				PaletteMap[0] = alphatex? 0 : GPalette.GrayMap[0];
-				PaletteMap[1] = GPalette.GrayMap[255];
+				PaletteMap[1] = alphatex? 255 : GPalette.GrayMap[255];
-				ReadPCX1bit (buffer, lump, &header);
+				ReadPCX1bit (Pixels.Data(), lump, &header);
 				break;
 
 			case 4:
 				for (int i = 0; i < 16; i++)
 				{
-					PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(false, header.palette[i * 3], header.palette[i * 3 + 1], header.palette[i * 3 + 2]);
+					PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(alphatex, header.palette[i * 3], header.palette[i * 3 + 1], header.palette[i * 3 + 2]);
 				}
-				ReadPCX4bits (buffer, lump, &header);
+				ReadPCX4bits (Pixels.Data(), lump, &header);
 				break;
 			}
 		}
@@ -390,19 +391,20 @@ void FPCXTexture::CreatePalettedPixels(uint8_t *buffer)
 				uint8_t r = lump.ReadUInt8();
 				uint8_t g = lump.ReadUInt8();
 				uint8_t b = lump.ReadUInt8();
-				PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(false, r, g, b);
+				PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(alphatex, r, g, b);
 			}
 			lump.Seek(sizeof(header), FileReader::SeekSet);
-			ReadPCX8bits (buffer, lump, &header);
+			ReadPCX8bits (Pixels.Data(), lump, &header);
 		}
 		if (Width == Height)
 		{
-			ImageHelpers::FlipSquareBlockRemap(buffer, Width, PaletteMap);
+			ImageHelpers::FlipSquareBlockRemap(Pixels.Data(), Width, PaletteMap);
 		}
 		else
 		{
 			TArray<uint8_t> newpix(Width*Height, true);
-			ImageHelpers::FlipNonSquareBlockRemap (newpix.Data(), buffer, Width, Height, Width, PaletteMap);
+			ImageHelpers::FlipNonSquareBlockRemap (newpix.Data(), Pixels.Data(), Width, Height, Width, PaletteMap);
+			return newpix;
 		}
 	}
 	else
@@ -414,11 +416,12 @@ void FPCXTexture::CreatePalettedPixels(uint8_t *buffer)
 		{
 			for(int x=0; x < Width; x++)
 			{
-				buffer[y + Height * x] = ImageHelpers::RGBToPalette(false, row[0], row[1], row[2]);
+				Pixels[y + Height * x] = ImageHelpers::RGBToPalette(alphatex, row[0], row[1], row[2]);
 				row+=3;
 			}
 		}
 	}
+	return Pixels;
 }
 
 //===========================================================================
@@ -436,8 +439,7 @@ int FPCXTexture::CopyPixels(FBitmap *bmp, int conversion)
 	int bitcount;
 	TArray<uint8_t> Pixels;
 
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader(SourceLump);
-	if (!lump.isOpen()) return -1;	// Just leave the texture blank.
 
 	lump.Read(&header, sizeof(header));
 

source/core/textures/formats/pngtexture.cpp

@@ -53,20 +53,22 @@
 class FPNGTexture : public FImageSource
 {
 public:
-	FPNGTexture (FileReader &lump, int width, int height, uint8_t bitdepth, uint8_t colortype, uint8_t interlace);
+	FPNGTexture (FileReader &lump, int lumpnum, int width, int height, uint8_t bitdepth, uint8_t colortype, uint8_t interlace);
 
-	void CreatePalettedPixels(uint8_t* buffer) override;
 	int CopyPixels(FBitmap *bmp, int conversion) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 
 protected:
+	void ReadAlphaRemap(FileReader *lump, uint8_t *alpharemap);
+
 	uint8_t BitDepth;
 	uint8_t ColorType;
 	uint8_t Interlace;
 	bool HaveTrans;
 	uint16_t NonPaletteTrans[3];
 
-	uint8_t PaletteMap[256];
+	uint8_t *PaletteMap = nullptr;
-	uint32_t PaletteSize = 0;
+	int PaletteSize = 0;
 	uint32_t StartOfIDAT = 0;
 	uint32_t StartOfPalette = 0;
 };
@@ -78,7 +80,7 @@ protected:
 //
 //==========================================================================
 
-FImageSource *PNGImage_TryCreate(FileReader & data)
+FImageSource *PNGImage_TryCreate(FileReader & data, int lumpnum)
 {
 	union
 	{
@@ -137,7 +139,7 @@ FImageSource *PNGImage_TryCreate(FileReader & data)
 		}
 	}
 
-	return new FPNGTexture (data, width, height, bitdepth, colortype, interlace);
+	return new FPNGTexture (data, lumpnum, width, height, bitdepth, colortype, interlace);
 }
 
 //==========================================================================
@@ -146,13 +148,14 @@ FImageSource *PNGImage_TryCreate(FileReader & data)
 //
 //==========================================================================
 
-FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
+FPNGTexture::FPNGTexture (FileReader &lump, int lumpnum, int width, int height,
 						  uint8_t depth, uint8_t colortype, uint8_t interlace)
-  : BitDepth(depth), ColorType(colortype), Interlace(interlace), HaveTrans(false)
+: FImageSource(lumpnum),
+  BitDepth(depth), ColorType(colortype), Interlace(interlace), HaveTrans(false)
 {
 	union
 	{
-		PalEntry palette[256];
+		uint32_t palette[256];
 		uint8_t pngpal[256][3];
 	} p;
 	uint8_t trans[256];
@@ -192,12 +195,12 @@ FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
 				ihoty = BigLong((int)hoty);
 				if (ihotx < -32768 || ihotx > 32767)
 				{
-					Printf ("X-Offset for PNG texture %s is bad: %d (0x%08x)\n", Name.GetChars(), ihotx, ihotx);
+					Printf ("X-Offset for PNG texture %s is bad: %d (0x%08x)\n", fileSystem.GetFileFullName (lumpnum), ihotx, ihotx);
 					ihotx = 0;
 				}
 				if (ihoty < -32768 || ihoty > 32767)
 				{
-					Printf ("Y-Offset for PNG texture %s is bad: %d (0x%08x)\n", Name.GetChars(), ihoty, ihoty);
+					Printf ("Y-Offset for PNG texture %s is bad: %d (0x%08x)\n", fileSystem.GetFileFullName (lumpnum), ihoty, ihoty);
 					ihoty = 0;
 				}
 				LeftOffset = ihotx;
@@ -206,7 +209,7 @@ FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
 			break;
 
 		case MAKE_ID('P','L','T','E'):
-			PaletteSize = std::min<int> (len / 3, 256);
+			PaletteSize = MIN<int> (len / 3, 256);
 			StartOfPalette = (uint32_t)lump.Tell();
 			lump.Read (p.pngpal, PaletteSize * 3);
 			if (PaletteSize * 3 != (int)len)
@@ -215,7 +218,7 @@ FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
 			}
 			for (i = PaletteSize - 1; i >= 0; --i)
 			{
-				p.palette[i] = PalEntry(p.pngpal[i][0], p.pngpal[i][1], p.pngpal[i][2]);
+				p.palette[i] = MAKERGB(p.pngpal[i][0], p.pngpal[i][1], p.pngpal[i][2]);
 			}
 			break;
 
@@ -246,27 +249,25 @@ FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
 		{
 			bMasked = true;
 			PaletteSize = 256;
-			memcpy (PaletteMap, GPalette.GrayMap+1, 256);
+			PaletteMap = (uint8_t*)ImageArena.Alloc(PaletteSize);
-			PaletteMap[255] = 254;	// cannot use 255.
+			memcpy (PaletteMap, GPalette.GrayMap, 256);
-			PaletteMap[NonPaletteTrans[0]] = 255;
+			PaletteMap[NonPaletteTrans[0]] = 0;
 		}
 		else
 		{
-			memcpy(PaletteMap, GPalette.GrayMap, 256);
+			PaletteMap = GPalette.GrayMap;
 		}
 		break;
 
 	case 3:		// Paletted
+		PaletteMap = (uint8_t*)ImageArena.Alloc(PaletteSize);
+		MakeRemap ((uint32_t*)GPalette.BaseColors, p.palette, PaletteMap, trans, PaletteSize);
 		for (i = 0; i < PaletteSize; ++i)
 		{
 			if (trans[i] == 0)
 			{
 				bMasked = true;
-				PaletteMap[i] = 255;
+				PaletteMap[i] = 0;
-			}
-			else
-			{
-				PaletteMap[i] = ColorMatcher.Pick(p.palette[i].r, p.palette[i].g, p.palette[i].b);
 			}
 		}
 		break;
@@ -287,13 +288,32 @@ FPNGTexture::FPNGTexture (FileReader &lump, int width, int height,
 //
 //==========================================================================
 
-void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
+void FPNGTexture::ReadAlphaRemap(FileReader *lump, uint8_t *alpharemap)
+{
+	auto p = lump->Tell();
+	lump->Seek(StartOfPalette, FileReader::SeekSet);
+	for (int i = 0; i < PaletteSize; i++)
+	{
+		uint8_t r = lump->ReadUInt8();
+		uint8_t g = lump->ReadUInt8();
+		uint8_t b = lump->ReadUInt8();
+		alpharemap[i] = PaletteMap[i] == 0 ? 0 : Luminance(r, g, b);
+	}
+	lump->Seek(p, FileReader::SeekSet);
+}
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+TArray<uint8_t> FPNGTexture::CreatePalettedPixels(int conversion)
 {
 	FileReader *lump;
 	FileReader lfr;
 
-	lfr = fileSystem.OpenFileReader(Name);
+	lfr = fileSystem.OpenFileReader(SourceLump);
-	if (!lfr.isOpen()) return;
 	lump = &lfr;
 
 	TArray<uint8_t> Pixels(Width*Height, true);
@@ -308,18 +328,46 @@ void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
 		lump->Read(&len, 4);
 		lump->Read(&id, 4);
 
+		bool alphatex = conversion == luminance;
 		if (ColorType == 0 || ColorType == 3)	/* Grayscale and paletted */
 		{
 			M_ReadIDAT (*lump, Pixels.Data(), Width, Height, Width, BitDepth, ColorType, Interlace, BigLong((unsigned int)len));
 
 			if (Width == Height)
 			{
-				ImageHelpers::FlipSquareBlockRemap (Pixels.Data(), Width, PaletteMap);
+				if (conversion != luminance)
+				{
+					ImageHelpers::FlipSquareBlockRemap (Pixels.Data(), Width, PaletteMap);
+				}
+				else if (ColorType == 0)
+				{
+					ImageHelpers::FlipSquareBlock (Pixels.Data(), Width);
+				}
+				else
+				{
+					uint8_t alpharemap[256];
+					ReadAlphaRemap(lump, alpharemap);
+					ImageHelpers::FlipSquareBlockRemap(Pixels.Data(), Width, alpharemap);
+				}
 			}
 			else
 			{
 				TArray<uint8_t> newpix(Width*Height, true);
-				ImageHelpers::FlipNonSquareBlockRemap (newpix.Data(), Pixels.Data(), Width, Height, Width, PaletteMap);
+				if (conversion != luminance)
+				{
+					ImageHelpers::FlipNonSquareBlockRemap (newpix.Data(), Pixels.Data(), Width, Height, Width, PaletteMap);
+				}
+				else if (ColorType == 0)
+				{
+					ImageHelpers::FlipNonSquareBlock (newpix.Data(), Pixels.Data(), Width, Height, Width);
+				}
+				else
+				{
+					uint8_t alpharemap[256];
+					ReadAlphaRemap(lump, alpharemap);
+					ImageHelpers::FlipNonSquareBlockRemap(newpix.Data(), Pixels.Data(), Width, Height, Width, alpharemap);
+				}
+				return newpix;
 			}
 		}
 		else		/* RGB and/or Alpha present */
@@ -346,11 +394,11 @@ void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
 					{
 						if (HaveTrans && in[0] == NonPaletteTrans[0] && in[1] == NonPaletteTrans[1] && in[2] == NonPaletteTrans[2])
 						{
-							*out++ = 255;
+							*out++ = 0;
 						}
 						else
 						{
-							*out++ = ImageHelpers::RGBToPalette(false, in[0], in[1], in[2]);
+							*out++ = ImageHelpers::RGBToPalette(alphatex, in[0], in[1], in[2]);
 						}
 						in += pitch;
 					}
@@ -365,7 +413,7 @@ void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
 				{
 					for (y = Height; y > 0; --y)
 					{
-						*out++ = PaletteMap[in[0]];
+						*out++ = alphatex? ((in[0] * in[1]) / 255) : in[1] < 128 ? 0 : PaletteMap[in[0]];
 						in += pitch;
 					}
 					in -= backstep;
@@ -379,7 +427,7 @@ void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
 				{
 					for (y = Height; y > 0; --y)
 					{
-						*out++ = ImageHelpers::RGBToPalette(false, in[0], in[1], in[2], in[3]);
+						*out++ = ImageHelpers::RGBToPalette(alphatex, in[0], in[1], in[2], in[3]);
 						in += pitch;
 					}
 					in -= backstep;
@@ -389,6 +437,7 @@ void FPNGTexture::CreatePalettedPixels(uint8_t *buffer)
 			delete[] tempix;
 		}
 	}
+	return Pixels;
 }
 
 //===========================================================================
@@ -409,9 +458,7 @@ int FPNGTexture::CopyPixels(FBitmap *bmp, int conversion)
 	FileReader *lump;
 	FileReader lfr;
 
-	lfr = fileSystem.OpenFileReader(Name);
+	lfr = fileSystem.OpenFileReader(SourceLump);
-	if (!lfr.isOpen()) return -1;	// Just leave the texture blank.
-
 	lump = &lfr;
 
 	lump->Seek(33, FileReader::SeekSet);
@@ -487,8 +534,8 @@ int FPNGTexture::CopyPixels(FBitmap *bmp, int conversion)
 		}
 		else
 		{
-			bmp->CopyPixelDataRGB(0, 0, Pixels, Width, Height, 3, pixwidth, 0, CF_RGBT,
+			bmp->CopyPixelDataRGB(0, 0, Pixels, Width, Height, 3, pixwidth, 0, CF_RGBT, nullptr,
-				nullptr, NonPaletteTrans[0], NonPaletteTrans[1], NonPaletteTrans[2]);
+				NonPaletteTrans[0], NonPaletteTrans[1], NonPaletteTrans[2]);
 			transpal = true;
 		}
 		break;
@@ -512,6 +559,8 @@ int FPNGTexture::CopyPixels(FBitmap *bmp, int conversion)
 }
 
 
+#include "textures.h"
+
 //==========================================================================
 //
 // A savegame picture

source/core/textures/formats/stbtexture.cpp

@@ -46,10 +46,10 @@
  
 
 #include "files.h"
+#include "filesystem.h"
 #include "bitmap.h"
 #include "imagehelpers.h"
 #include "image.h"
-#include "filesystem.h"
 
 //==========================================================================
 //
@@ -66,8 +66,8 @@ class FStbTexture : public FImageSource
 {
 
 public:
-	FStbTexture (int w, int h);
+	FStbTexture (int lumpnum, int w, int h);
-	void CreatePalettedPixels(uint8_t *destbuffer) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 	int CopyPixels(FBitmap *bmp, int conversion) override;
 };
 
@@ -83,14 +83,14 @@ static stbi_io_callbacks callbacks = {
 //
 //==========================================================================
 
-FImageSource *StbImage_TryCreate(FileReader & file)
+FImageSource *StbImage_TryCreate(FileReader & file, int lumpnum)
 {
 	int x, y, comp;
 	file.Seek(0, FileReader::SeekSet);
 	int result = stbi_info_from_callbacks(&callbacks, &file, &x, &y, &comp);
 	if (result == 1)
 	{
-		return new FStbTexture(x, y);
+		return new FStbTexture(lumpnum, x, y);
 	}
 	
 	return nullptr;
@@ -102,7 +102,8 @@ FImageSource *StbImage_TryCreate(FileReader & file)
 //
 //==========================================================================
 
-FStbTexture::FStbTexture (int w, int h)
+FStbTexture::FStbTexture (int lumpnum, int w, int h)
+	: FImageSource(lumpnum)
 {
 	Width = w;
 	Height = h;
@@ -116,19 +117,21 @@ FStbTexture::FStbTexture (int w, int h)
 //
 //==========================================================================
 
-void FStbTexture::CreatePalettedPixels(uint8_t *buffer)
+TArray<uint8_t> FStbTexture::CreatePalettedPixels(int conversion)
 {
 	FBitmap bitmap;
 	bitmap.Create(Width, Height);
-	CopyPixels(&bitmap, 0);
+	CopyPixels(&bitmap, conversion);
 	const uint8_t *data = bitmap.GetPixels();
 
 	uint8_t *dest_p;
 	int dest_adv = Height;
 	int dest_rew = Width * Height - 1;
 
-	dest_p = buffer;
+	TArray<uint8_t> Pixels(Width*Height, true);
+	dest_p = Pixels.Data();
 
+	bool doalpha = conversion == luminance; 
 	// Convert the source image from row-major to column-major format and remap it
 	for (int y = Height; y != 0; --y)
 	{
@@ -139,11 +142,12 @@ void FStbTexture::CreatePalettedPixels(uint8_t *buffer)
 			int r = *data++;
 			int a = *data++;
 			if (a < 128) *dest_p = 0;
-			else *dest_p = ImageHelpers::RGBToPalette(false, r, g, b); 
+			else *dest_p = ImageHelpers::RGBToPalette(doalpha, r, g, b); 
 			dest_p += dest_adv;
 		}
 		dest_p -= dest_rew;
 	}
+	return Pixels;
 }
 
 //==========================================================================
@@ -154,8 +158,7 @@ void FStbTexture::CreatePalettedPixels(uint8_t *buffer)
 
 int FStbTexture::CopyPixels(FBitmap *bmp, int conversion)
 {
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump); 
-	if (!lump.isOpen()) return -1;	// Just leave the texture blank.
 	int x, y, chan;
 	auto image = stbi_load_from_callbacks(&callbacks, &lump, &x, &y, &chan, STBI_rgb_alpha); 	
 	if (image)

source/core/textures/formats/tgatexture.cpp

@@ -34,11 +34,11 @@
 */
 
 #include "files.h"
+#include "filesystem.h"
 #include "templates.h"
 #include "bitmap.h"
-#include "image.h"
-#include "filesystem.h"
 #include "imagehelpers.h"
+#include "image.h"
 
 
 //==========================================================================
@@ -77,13 +77,13 @@ struct TGAHeader
 class FTGATexture : public FImageSource
 {
 public:
-	FTGATexture (TGAHeader *);
+	FTGATexture (int lumpnum, TGAHeader *);
 
 	int CopyPixels(FBitmap *bmp, int conversion) override;
 
 protected:
 	void ReadCompressed(FileReader &lump, uint8_t * buffer, int bytesperpixel);
-	void CreatePalettedPixels(uint8_t *destbuffer) override;
+	TArray<uint8_t> CreatePalettedPixels(int conversion) override;
 };
 
 //==========================================================================
@@ -92,7 +92,7 @@ protected:
 //
 //==========================================================================
 
-FImageSource *TGAImage_TryCreate(FileReader & file)
+FImageSource *TGAImage_TryCreate(FileReader & file, int lumpnum)
 {
 	TGAHeader hdr;
 
@@ -117,7 +117,7 @@ FImageSource *TGAImage_TryCreate(FileReader & file)
 	hdr.width = LittleShort(hdr.width);
 	hdr.height = LittleShort(hdr.height);
 
-	return new FTGATexture(&hdr);
+	return new FTGATexture(lumpnum, &hdr);
 }
 
 //==========================================================================
@@ -126,7 +126,8 @@ FImageSource *TGAImage_TryCreate(FileReader & file)
 //
 //==========================================================================
 
-FTGATexture::FTGATexture(TGAHeader * hdr)
+FTGATexture::FTGATexture (int lumpnum, TGAHeader * hdr)
+: FImageSource(lumpnum)
 {
 	Width = hdr->width;
 	Height = hdr->height;
@@ -152,7 +153,7 @@ void FTGATexture::ReadCompressed(FileReader &lump, uint8_t * buffer, int bytespe
 		{
 			b&=~128;
 			lump.Read(data, bytesperpixel);
-			for (int i=std::min<int>(Size, (b+1)); i>0; i--)
+			for (int i=MIN<int>(Size, (b+1)); i>0; i--)
 			{
 				buffer[0] = data[0];
 				if (bytesperpixel>=2) buffer[1] = data[1];
@@ -163,7 +164,7 @@ void FTGATexture::ReadCompressed(FileReader &lump, uint8_t * buffer, int bytespe
 		}
 		else 
 		{
-			lump.Read(buffer, std::min<int>(Size, (b+1))*bytesperpixel);
+			lump.Read(buffer, MIN<int>(Size, (b+1))*bytesperpixel);
 			buffer += (b+1)*bytesperpixel;
 		}
 		Size -= b+1;
@@ -176,11 +177,10 @@ void FTGATexture::ReadCompressed(FileReader &lump, uint8_t * buffer, int bytespe
 //
 //==========================================================================
 
-void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
+TArray<uint8_t> FTGATexture::CreatePalettedPixels(int conversion)
 {
 	uint8_t PaletteMap[256];
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return;
 	TGAHeader hdr;
 	uint16_t w;
 	uint8_t r,g,b,a;
@@ -229,22 +229,23 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 				r=g=b=a=0;
 				break;
 			}
-			PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(false, r, g, b, a);
+			PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(conversion == luminance, r, g, b, a);
 		}
     }
     
     int Size = Width * Height * (hdr.bpp>>3);
+	TArray<uint8_t> buffer(Size, true);
    	
     if (hdr.img_type < 4)	// uncompressed
     {
-    	lump.Read(buffer, Size);
+    	lump.Read(buffer.Data(), Size);
     }
     else				// compressed
     {
-    	ReadCompressed(lump, buffer, hdr.bpp>>3);
+    	ReadCompressed(lump, buffer.Data(), hdr.bpp>>3);
     }
     
-	uint8_t * ptr = buffer;
+	uint8_t * ptr = buffer.Data();
 	int step_x = (hdr.bpp>>3);
 	int Pitch = Width * step_x;
 
@@ -287,7 +288,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 				for(int x=0;x<Width;x++)
 				{
 					int v = LittleShort(*p);
-					Pixels[x*Height + y] = ImageHelpers::RGBToPalette(false, ((v >> 10) & 0x1f) * 8, ((v >> 5) & 0x1f) * 8, (v & 0x1f) * 8);
+					Pixels[x*Height + y] = ImageHelpers::RGBToPalette(conversion == luminance, ((v >> 10) & 0x1f) * 8, ((v >> 5) & 0x1f) * 8, (v & 0x1f) * 8);
 					p+=step_x;
 				}
 			}
@@ -299,7 +300,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 				uint8_t * p = ptr + y * Pitch;
 				for(int x=0;x<Width;x++)
 				{
-					Pixels[x*Height + y] = ImageHelpers::RGBToPalette(false, p[2], p[1], p[0]);
+					Pixels[x*Height + y] = ImageHelpers::RGBToPalette(conversion == luminance, p[2], p[1], p[0]);
 					p+=step_x;
 				}
 			}
@@ -313,7 +314,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 					uint8_t * p = ptr + y * Pitch;
 					for(int x=0;x<Width;x++)
 					{
-						Pixels[x*Height + y] = ImageHelpers::RGBToPalette(false, p[2], p[1], p[0]);
+						Pixels[x*Height + y] = ImageHelpers::RGBToPalette(conversion == luminance, p[2], p[1], p[0]);
 						p+=step_x;
 					}
 				}
@@ -325,7 +326,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 					uint8_t * p = ptr + y * Pitch;
 					for(int x=0;x<Width;x++)
 					{
-						Pixels[x*Height + y] = ImageHelpers::RGBToPalette(false, p[2], p[1], p[0], p[3]);
+						Pixels[x*Height + y] = ImageHelpers::RGBToPalette(conversion == luminance, p[2], p[1], p[0], p[3]);
 						p+=step_x;
 					}
 				}
@@ -339,7 +340,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 	
 	case 3:	// Grayscale
 	{
-		auto remap = GPalette.GrayMap;
+		auto remap = ImageHelpers::GetRemap(conversion == luminance, true);
 		switch (hdr.bpp)
 		{
 		case 8:
@@ -374,6 +375,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 	default:
 		break;
     }
+	return Pixels;
 }	
 
 //===========================================================================
@@ -385,8 +387,7 @@ void FTGATexture::CreatePalettedPixels(uint8_t *buffer)
 int FTGATexture::CopyPixels(FBitmap *bmp, int conversion)
 {
 	PalEntry pe[256];
-	auto lump = fileSystem.OpenFileReader(Name);
+	auto lump = fileSystem.OpenFileReader (SourceLump);
-	if (!lump.isOpen()) return -1;
 	TGAHeader hdr;
 	uint16_t w;
 	uint8_t r,g,b,a;
@@ -441,7 +442,7 @@ int FTGATexture::CopyPixels(FBitmap *bmp, int conversion)
     }
     
     int Size = Width * Height * (hdr.bpp>>3);
-	TArray<uint8_t> sbuffer(Size, true);
+	TArray<uint8_t> sbuffer(Size);
    	
     if (hdr.img_type < 4)	// uncompressed
     {

source/core/textures/image.cpp

@@ -34,14 +34,160 @@
 **
 */
 
-#include "memarena.h"
 #include "bitmap.h"
 #include "image.h"
-#include "files.h"
 #include "filesystem.h"
-#include "imagehelpers.h"
+#include "files.h"
+#include "cmdlib.h"
+#include "palettecontainer.h"
 
+FMemArena FImageSource::ImageArena(32768);
+TArray<FImageSource *>FImageSource::ImageForLump;
 int FImageSource::NextID;
+static PrecacheInfo precacheInfo;
+
+struct PrecacheDataPaletted
+{
+	TArray<uint8_t> Pixels;
+	int RefCount;
+	int ImageID;
+};
+
+struct PrecacheDataRgba
+{
+	FBitmap Pixels;
+	int TransInfo;
+	int RefCount;
+	int ImageID;
+};
+
+// TMap doesn't handle this kind of data well.  std::map neither. The linear search is still faster, even for a few 100 entries because it doesn't have to access the heap as often..
+TArray<PrecacheDataPaletted> precacheDataPaletted;
+TArray<PrecacheDataRgba> precacheDataRgba;
+
+//===========================================================================
+// 
+// the default just returns an empty texture.
+//
+//===========================================================================
+
+TArray<uint8_t> FImageSource::CreatePalettedPixels(int conversion)
+{
+	TArray<uint8_t> Pixels(Width * Height, true);
+	memset(Pixels.Data(), 0, Width * Height);
+	return Pixels;
+}
+
+PalettedPixels FImageSource::GetCachedPalettedPixels(int conversion)
+{
+	PalettedPixels ret;
+
+	FString name;
+	fileSystem.GetFileShortName(name, SourceLump);
+
+	std::pair<int, int> *info = nullptr;
+	auto imageID = ImageID;
+
+	// Do we have this image in the cache?
+	unsigned index = conversion != normal? UINT_MAX : precacheDataPaletted.FindEx([=](PrecacheDataPaletted &entry) { return entry.ImageID == imageID; });
+	if (index < precacheDataPaletted.Size())
+	{
+		auto cache = &precacheDataPaletted[index];
+
+		if (cache->RefCount > 1)
+		{
+			//Printf("returning reference to %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+			ret.Pixels.Set(cache->Pixels.Data(), cache->Pixels.Size());
+			cache->RefCount--;
+		}
+		else if (cache->Pixels.Size() > 0)
+		{
+			//Printf("returning contents of %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+			ret.PixelStore = std::move(cache->Pixels);
+			ret.Pixels.Set(ret.PixelStore.Data(), ret.PixelStore.Size());
+			precacheDataPaletted.Delete(index);
+		}
+		else
+		{
+			//Printf("something bad happened for %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+		}
+	}
+	else
+	{
+		// The image wasn't cached. Now there's two possibilities: 
+		auto info = precacheInfo.CheckKey(ImageID);
+		if (!info || info->second <= 1 || conversion != normal)
+		{
+			// This is either the only copy needed or some access outside the caching block. In these cases create a new one and directly return it.
+			//Printf("returning fresh copy of %s\n", name.GetChars());
+			ret.PixelStore = CreatePalettedPixels(conversion);
+			ret.Pixels.Set(ret.PixelStore.Data(), ret.PixelStore.Size());
+		}
+		else
+		{
+			//Printf("creating cached entry for %s, refcount = %d\n", name.GetChars(), info->second);
+			// This is the first time it gets accessed and needs to be placed in the cache.
+			PrecacheDataPaletted *pdp = &precacheDataPaletted[precacheDataPaletted.Reserve(1)];
+
+			pdp->ImageID = imageID;
+			pdp->RefCount = info->second - 1;
+			info->second = 0;
+			pdp->Pixels = CreatePalettedPixels(normal);
+			ret.Pixels.Set(pdp->Pixels.Data(), pdp->Pixels.Size());
+		}
+	}
+	return ret;
+}
+
+TArray<uint8_t> FImageSource::GetPalettedPixels(int conversion)
+{
+	auto pix = GetCachedPalettedPixels(conversion);
+	if (pix.ownsPixels())
+	{
+		// return the pixel store of the returned data directly if this was the last reference.
+		auto array = std::move(pix.PixelStore);
+		return array;
+	}
+	else
+	{
+		// If there are pending references, make a copy.
+		TArray<uint8_t> array(pix.Pixels.Size(), true);
+		memcpy(array.Data(), pix.Pixels.Data(), array.Size());
+		return array;
+	}
+}
+
+
+
+//===========================================================================
+//
+// FImageSource::CopyPixels
+//
+// this is the generic case that can handle
+// any properly implemented texture for software rendering.
+// Its drawback is that it is limited to the base palette which is
+// why all classes that handle different palettes should subclass this
+// method
+//
+//===========================================================================
+
+int FImageSource::CopyPixels(FBitmap *bmp, int conversion)
+{
+	if (conversion == luminance) conversion = normal;	// luminance images have no use as an RGB source.
+	PalEntry *palette = GPalette.BaseColors;
+	for(int i=1;i<256;i++) palette[i].a = 255;	// set proper alpha values
+	auto ppix = CreatePalettedPixels(conversion);
+	bmp->CopyPixelData(0, 0, ppix.Data(), Width, Height, Height, 1, 0, palette, nullptr);
+	for(int i=1;i<256;i++) palette[i].a = 0;
+	return 0;
+}
+
+int FImageSource::CopyTranslatedPixels(FBitmap *bmp, const PalEntry *remap)
+{
+	auto ppix = CreatePalettedPixels(false);
+	bmp->CopyPixelData(0, 0, ppix.Data(), Width, Height, Height, 1, 0, remap, nullptr);
+	return 0;
+}
 
 //==========================================================================
 //
@@ -49,46 +195,184 @@ int FImageSource::NextID;
 //
 //==========================================================================
 
-typedef FImageSource * (*CreateFunc)(FileReader & file);
+FBitmap FImageSource::GetCachedBitmap(const PalEntry *remap, int conversion, int *ptrans)
+{
+	FBitmap ret;
+	
+	FString name;
+	int trans = -1;
+	fileSystem.GetFileShortName(name, SourceLump);
+	
+	std::pair<int, int> *info = nullptr;
+	auto imageID = ImageID;
+	
+	if (remap != nullptr)
+	{
+		// Remapped images are never run through the cache because they would complicate matters too much for very little gain.
+		// Translated images are normally sprites which normally just consist of a single image and use no composition.
+		// Additionally, since translation requires the base palette, the really time consuming stuff will never be subjected to it.
+		ret.Create(Width, Height);
+		trans = CopyTranslatedPixels(&ret, remap);
+	}
+	else
+	{
+		if (conversion == luminance) conversion = normal;	// luminance has no meaning for true color.
+		// Do we have this image in the cache?
+		unsigned index = conversion != normal? UINT_MAX : precacheDataRgba.FindEx([=](PrecacheDataRgba &entry) { return entry.ImageID == imageID; });
+		if (index < precacheDataRgba.Size())
+		{
+			auto cache = &precacheDataRgba[index];
+			
+			trans = cache->TransInfo;
+			if (cache->RefCount > 1)
+			{
+				//Printf("returning reference to %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+				ret.Copy(cache->Pixels, false);
+				cache->RefCount--;
+			}
+			else if (cache->Pixels.GetPixels())
+			{
+				//Printf("returning contents of %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+				ret = std::move(cache->Pixels);
+				precacheDataRgba.Delete(index);
+			}
+			else
+			{
+				// This should never happen if the function is implemented correctly
+				//Printf("something bad happened for %s, refcount = %d\n", name.GetChars(), cache->RefCount);
+				ret.Create(Width, Height);
+				trans = CopyPixels(&ret, normal);
+			}
+		}
+		else
+		{
+			// The image wasn't cached. Now there's two possibilities:
+			auto info = precacheInfo.CheckKey(ImageID);
+			if (!info || info->first <= 1 || conversion != normal)
+			{
+				// This is either the only copy needed or some access outside the caching block. In these cases create a new one and directly return it.
+				//Printf("returning fresh copy of %s\n", name.GetChars());
+				ret.Create(Width, Height);
+				trans = CopyPixels(&ret, conversion);
+			}
+			else
+			{
+				//Printf("creating cached entry for %s, refcount = %d\n", name.GetChars(), info->first);
+				// This is the first time it gets accessed and needs to be placed in the cache.
+				PrecacheDataRgba *pdr = &precacheDataRgba[precacheDataRgba.Reserve(1)];
+				
+				pdr->ImageID = imageID;
+				pdr->RefCount = info->first - 1;
+				info->first = 0;
+				pdr->Pixels.Create(Width, Height);
+				trans = pdr->TransInfo = CopyPixels(&pdr->Pixels, normal);
+				ret.Copy(pdr->Pixels, false);
+			}
+		}
+	}
+	if (ptrans) *ptrans = trans;
+	return ret;
+}
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+void FImageSource::CollectForPrecache(PrecacheInfo &info, bool requiretruecolor)
+{
+	auto val = info.CheckKey(ImageID);
+	bool tc = requiretruecolor;
+	if (val)
+	{
+		val->first += tc;
+		val->second += !tc;
+	}
+	else
+	{
+		auto pair = std::make_pair(tc, !tc);
+		info.Insert(ImageID, pair);
+	}
+}
+
+void FImageSource::BeginPrecaching()
+{
+	precacheInfo.Clear();
+}
+
+void FImageSource::EndPrecaching()
+{
+	precacheDataPaletted.Clear();
+	precacheDataRgba.Clear();
+}
+
+void FImageSource::RegisterForPrecache(FImageSource *img, bool requiretruecolor)
+{
+	img->CollectForPrecache(precacheInfo, requiretruecolor);
+}
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+typedef FImageSource * (*CreateFunc)(FileReader & file, int lumpnum);
 
 struct TexCreateInfo
 {
 	CreateFunc TryCreate;
+	bool checkflat;
 };
 
-FImageSource *PNGImage_TryCreate(FileReader &);
+FImageSource *PNGImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *JPEGImage_TryCreate(FileReader &);
+FImageSource *JPEGImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *DDSImage_TryCreate(FileReader &);
+FImageSource *DDSImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *PCXImage_TryCreate(FileReader &);
+FImageSource *PCXImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *TGAImage_TryCreate(FileReader &);
+FImageSource *TGAImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *ArtImage_TryCreate(FileReader &);
+FImageSource *StbImage_TryCreate(FileReader &, int lumpnum);
-FImageSource *StbImage_TryCreate(FileReader &);
 
 
 // Examines the lump contents to decide what type of texture to create,
 // and creates the texture.
-FImageSource * FImageSource::GetImage(const char *name)
+FImageSource * FImageSource::GetImage(int lumpnum, bool isflat)
 {
 	static TexCreateInfo CreateInfo[] = {
-		{ PNGImage_TryCreate },
+		{ PNGImage_TryCreate,			false },
-		{ JPEGImage_TryCreate },
+		{ JPEGImage_TryCreate,			false },
-		{ DDSImage_TryCreate },
+		{ DDSImage_TryCreate,			false },
-		{ PCXImage_TryCreate },
+		{ PCXImage_TryCreate,			false },
-		{ StbImage_TryCreate },
+		{ StbImage_TryCreate,			false },
-		{ ArtImage_TryCreate },
+		{ TGAImage_TryCreate,			false },
-		{ nullptr }
 	};
 
-	auto data = fileSystem.OpenFileReader(name);
+	if (lumpnum == -1) return nullptr;
-	if (!data.isOpen())  return nullptr;
 
-	for (size_t i = 0; CreateInfo[i].TryCreate; i++)
+	unsigned size = ImageForLump.Size();
+	if (size <= (unsigned)lumpnum)
 	{
-		auto image = CreateInfo[i].TryCreate(data);
+		// Hires textures can be added dynamically to the end of the lump array, so this must be checked each time.
-		if (image != nullptr)
+		ImageForLump.Resize(lumpnum + 1);
+		for (; size < ImageForLump.Size(); size++) ImageForLump[size] = nullptr;
+	}
+	// An image for this lump already exists. We do not need another one.
+	if (ImageForLump[lumpnum] != nullptr) return ImageForLump[lumpnum];
+
+	auto data = fileSystem.OpenFileReader(lumpnum);
+	if (!data.isOpen()) 
+		return nullptr;
+
+	for (size_t i = 0; i < countof(CreateInfo); i++)
+	{
+		if (!CreateInfo[i].checkflat || isflat)
 		{
-			image->Name = name;
+			auto image = CreateInfo[i].TryCreate(data, lumpnum);
-			return image;
+			if (image != nullptr)
+			{
+				ImageForLump[lumpnum] = image;
+				return image;
+			}
 		}
 	}
 	return nullptr;

source/core/textures/image.h

@@ -10,6 +10,16 @@
 class FImageSource;
 using PrecacheInfo = TMap<int, std::pair<int, int>>;
 
+// Doom patch format header
+struct patch_t
+{
+	int16_t			width;			// bounding box size 
+	int16_t			height;
+	int16_t			leftoffset; 	// pixels to the left of origin 
+	int16_t			topoffset;		// pixels below the origin 
+	uint32_t 		columnofs[1];	// only [width] used
+};
+
 struct PalettedPixels
 {
 	friend class FImageSource;
@@ -27,8 +37,11 @@ private:
 // All it can do is provide raw image data to its users.
 class FImageSource
 {
+	friend class FBrightmapTexture;
 protected:
 
+	static FMemArena ImageArena;
+	static TArray<FImageSource *>ImageForLump;
 	static int NextID;
 
 	int SourceLump;
@@ -36,14 +49,17 @@ protected:
 	int LeftOffset = 0, TopOffset = 0;			// Offsets stored in the image.
 	bool bUseGamePalette = false;				// true if this is an image without its own color set.
 	int ImageID = -1;
-	FString Name;
 
 	// Internal image creation functions. All external access should go through the cache interface,
 	// so that all code can benefit from future improvements to that.
 
+	virtual TArray<uint8_t> CreatePalettedPixels(int conversion);
+	virtual int CopyPixels(FBitmap *bmp, int conversion);			// This will always ignore 'luminance'.
+	int CopyTranslatedPixels(FBitmap *bmp, const PalEntry *remap);
+
+
 public:
 
-	virtual ~FImageSource() = default;
 	void CopySize(FImageSource &other)
 	{
 		Width = other.Width;
@@ -53,16 +69,30 @@ public:
 		SourceLump = other.SourceLump;
 	}
 
+	// Images are statically allocated and freed in bulk. None of the subclasses may hold any destructible data.
+	void *operator new(size_t block) { return ImageArena.Alloc(block); }
+	void operator delete(void *block) {}
+
 	bool bMasked = true;						// Image (might) have holes (Assume true unless proven otherwise!)
 	int8_t bTranslucent = -1;					// Image has pixels with a non-0/1 value. (-1 means the user needs to do a real check)
 
 	int GetId() const { return ImageID; }
 	
 	// 'noremap0' will only be looked at by FPatchTexture and forwarded by FMultipatchTexture.
-	static FImageSource * GetImage(const char *name);
 
-	virtual void CreatePalettedPixels(uint8_t *destbuffer) = 0;
+	// Either returns a reference to the cache, or a newly created item. The return of this has to be considered transient. If you need to store the result, use GetPalettedPixels
-	virtual int CopyPixels(FBitmap* bmp, int conversion) = 0;			// This will always ignore 'luminance'.
+	PalettedPixels GetCachedPalettedPixels(int conversion);
+
+	// tries to get a buffer from the cache. If not available, create a new one. If further references are pending, create a copy.
+	TArray<uint8_t> GetPalettedPixels(int conversion);
+
+	
+	// Unlile for paletted images there is no variant here that returns a persistent bitmap, because all users have to process the returned image into another format.
+	FBitmap GetCachedBitmap(const PalEntry *remap, int conversion, int *trans = nullptr);
+
+	static void ClearImages() { ImageArena.FreeAll(); ImageForLump.Clear(); NextID = 0; }
+	static FImageSource * GetImage(int lumpnum, bool checkflat);
+
 
 
 	// Conversion option
@@ -74,6 +104,7 @@ public:
 	};
 	
 	FImageSource(int sourcelump = -1) : SourceLump(sourcelump) { ImageID = ++NextID; }
+	virtual ~FImageSource() {}
 	
 	int GetWidth() const
 	{
@@ -110,6 +141,11 @@ public:
 	{
 		return bUseGamePalette;
 	}
+
+	virtual void CollectForPrecache(PrecacheInfo &info, bool requiretruecolor);
+	static void BeginPrecaching();
+	static void EndPrecaching();
+	static void RegisterForPrecache(FImageSource *img, bool requiretruecolor);
 };
 
 //==========================================================================

source/core/textures/imagehelpers.h

@@ -39,24 +39,49 @@
 
 #include <stdint.h>
 #include "tarray.h"
-#include "palentry.h"
+#include "colormatcher.h"
 #include "bitmap.h"
-#include "palutil.h"
 #include "palettecontainer.h"
 #include "v_colortables.h"
 
 namespace ImageHelpers
 {
-	extern int alphaThreshold;
+	// Helpers for creating paletted images.
-
+	inline uint8_t *GetRemap(bool wantluminance, bool srcisgrayscale = false)
+	{
+		if (wantluminance)
+		{
+			return srcisgrayscale ? GPalette.GrayRamp.Remap : GPalette.GrayscaleMap.Remap;
+		}
+		else
+		{
+			return srcisgrayscale ? GPalette.GrayMap : GPalette.Remap;
+		}
+	}
+	
 	inline uint8_t RGBToPalettePrecise(bool wantluminance, int r, int g, int b, int a = 255)
 	{
-		return BestColor((uint32_t*)GPalette.BaseColors, r, g, b);
+		if (wantluminance)
+		{
+			return (uint8_t)Luminance(r, g, b) * a / 255;
+		}
+		else
+		{
+			return ColorMatcher.Pick(r, g, b);
+		}
 	}
 	
 	inline uint8_t RGBToPalette(bool wantluminance, int r, int g, int b, int a = 255)
 	{
-		return a < alphaThreshold? 255 : RGB256k.RGB[r >> 2][g >> 2][b >> 2];
+		if (wantluminance)
+		{
+			// This is the same formula the OpenGL renderer uses for grayscale textures with an alpha channel.
+			return (uint8_t)(Luminance(r, g, b) * a / 255);
+		}
+		else
+		{
+			return a < 128? 0 : RGB256k.RGB[r >> 2][g >> 2][b >> 2];
+		}
 	}
 	
 	inline uint8_t RGBToPalette(bool wantluminance, PalEntry pe, bool hasalpha = true)

source/core/textures/imagetexture.cpp

@@ -71,20 +71,7 @@ FImageTexture::FImageTexture(FImageSource *img, const char *name)
 
 FBitmap FImageTexture::GetBgraBitmap(const PalEntry *p, int *trans)
 {
-	FBitmap bmp;
+	return mImage->GetCachedBitmap(p, FImageSource::normal, trans);
-	bmp.Create(Size.x, Size.y);
-	if (p == nullptr)
-	{
-		mImage->CopyPixels(&bmp, 0);
-	}
-	else 
-	{
-		// For different base palettes the image needs to be downconverted.
-		TArray<uint8_t> ppix(Size.x * Size.y, true);
-		mImage->CreatePalettedPixels(ppix.Data());
-		bmp.CopyPixelData(0, 0, ppix.Data(), Size.x, Size.y, Size.y, 1, 0, p);
-	}
-	return bmp;
 }
 
 //===========================================================================
@@ -95,6 +82,7 @@ FBitmap FImageTexture::GetBgraBitmap(const PalEntry *p, int *trans)
 
 void FImageTexture::Create8BitPixels(uint8_t* buffer)
 {
-	ImageHelpers::alphaThreshold = alphaThreshold;
+	//ImageHelpers::alphaThreshold = alphaThreshold;
-	return mImage->CreatePalettedPixels(buffer);
+	auto buf = mImage->GetPalettedPixels(FImageSource::normal);
+	memcpy(buffer, buf.Data(), buf.Size());
 }

source/core/textures/texture.cpp

@@ -56,7 +56,9 @@ FTexture *CreateBrightmapTexture(FImageSource*);
 // and creates the texture.
 FTexture * FTexture::CreateTexture(const char *name)
 {
-	auto image = FImageSource::GetImage(name);
+	int lump = fileSystem.FindFile(name);
+	if (lump < 0) return nullptr;
+	auto image = FImageSource::GetImage(lump, false);
 	if (image != nullptr)
 	{
 		FTexture *tex = new FImageTexture(image);