From e5261249335b2e6f5f6c2b42af3e70d6ba2259a0 Mon Sep 17 00:00:00 2001
From: Ilya Shurumov <ishurumov@gmail.com>
Date: Tue, 16 Mar 2021 02:26:01 +0600
Subject: [PATCH] - added Targa loading code

---
 src_rebuild/utils/targa.cpp | 180 ++++++++++++++++++++++++++++++++++++
 src_rebuild/utils/targa.h   |  28 ++++++
 2 files changed, 208 insertions(+)
 create mode 100644 src_rebuild/utils/targa.cpp
 create mode 100644 src_rebuild/utils/targa.h

diff --git a/src_rebuild/utils/targa.cpp b/src_rebuild/utils/targa.cpp
new file mode 100644
index 00000000..24d45df1
--- /dev/null
+++ b/src_rebuild/utils/targa.cpp
@@ -0,0 +1,180 @@
+#include "targa.h"
+#include <stdio.h>
+#include <string.h>
+
+bool LoadTGAImage(const char* filename, u_char** data, int& width, int& height, int& bpp)
+{
+	FILE* fp;
+	TGAHeader header;
+
+	int size, x, y, pixelSize, palLength;
+	u_char* tempBuffer, * fBuffer, * dest, * src;
+	uint tempPixel;
+	u_char palette[768];
+
+	fp = fopen(filename, "rb");
+	if (!fp)
+		return false;
+
+	fseek(fp, 0, SEEK_END);
+	size = ftell(fp);
+	fseek(fp, 0, SEEK_SET);
+
+	// Read the header
+	fread(&header, sizeof(header), 1, fp);
+
+	width = header.width;
+	height = header.height;
+
+	pixelSize = header.bpp / 8;
+
+	if ((palLength = header.descriptionlen + header.cmapentries * header.cmapbits / 8) > 0)
+		fread(palette, sizeof(palette), 1, fp);
+
+	// Read the file data
+	fBuffer = new u_char[size - sizeof(header) - palLength];
+	fread(fBuffer, size - sizeof(header) - palLength, 1, fp);
+	fclose(fp);
+
+	size = width * height * pixelSize;
+
+	// Decode if rle compressed. Bit 3 of .imagetype tells if the file is compressed
+	if (header.imagetype & 0x08)
+	{
+		uint c, count;
+
+		tempBuffer = new u_char[size];
+
+		dest = tempBuffer;
+		src = fBuffer;
+
+		while (size > 0)
+		{
+			// Get packet header
+			c = *src++;
+
+			count = (c & 0x7f) + 1;
+			size -= count * pixelSize;
+
+			if (c & 0x80)
+			{
+				// Rle packet
+				do
+				{
+					memcpy(dest, src, pixelSize);
+					dest += pixelSize;
+				} while (--count);
+
+				src += pixelSize;
+			}
+			else
+			{
+				// Raw packet
+				count *= pixelSize;
+				memcpy(dest, src, count);
+				src += count;
+				dest += count;
+			}
+		}
+
+		src = tempBuffer;
+	}
+	else
+	{
+		tempBuffer = NULL;
+		src = fBuffer;
+	}
+
+	src += (header.bpp / 8) * width * (height - 1);
+
+	bpp = header.bpp;
+
+	switch (header.bpp)
+	{
+		case 8:
+			if (palLength > 0)
+			{
+				bpp = 24;
+				dest = *data = new u_char[width * height * 3];
+				for (y = 0; y < height; y++)
+				{
+					for (x = 0; x < width; x++)
+					{
+						tempPixel = 3 * (*src++);
+						*dest++ = palette[tempPixel + 2];
+						*dest++ = palette[tempPixel + 1];
+						*dest++ = palette[tempPixel];
+					}
+					src -= 2 * width;
+				}
+			}
+			else
+			{
+				bpp = 8;
+				dest = *data = new u_char[width * height];
+				for (y = 0; y < height; y++)
+				{
+					memcpy(dest, src, width);
+					dest += width;
+					src -= width;
+				}
+			}
+			break;
+		case 16:
+			bpp = 32;
+			dest = *data = new u_char[width * height * 4];
+			for (y = 0; y < height; y++)
+			{
+				for (x = 0; x < width; x++)
+				{
+					tempPixel = *((unsigned short*)src);
+
+					dest[0] = ((tempPixel >> 10) & 0x1F) << 3;
+					dest[1] = ((tempPixel >> 5) & 0x1F) << 3;
+					dest[2] = ((tempPixel) & 0x1F) << 3;
+					dest[3] = ((tempPixel >> 15) ? 0xFF : 0);
+					dest += 4;
+					src += 2;
+				}
+				src -= 4 * width;
+			}
+			break;
+		case 24:
+			bpp = 24;
+			dest = *data = new u_char[width * height * 3];
+
+			for (y = 0; y < height; y++)
+			{
+				for (x = 0; x < width; x++)
+				{
+					*dest++ = src[2];
+					*dest++ = src[1];
+					*dest++ = src[0];
+					src += 3;
+				}
+				src -= 6 * width;
+			}
+			break;
+		case 32:
+			bpp = 32;
+			dest = *data = new u_char[width * height * 4];
+			for (y = 0; y < height; y++)
+			{
+				for (x = 0; x < width; x++)
+				{
+					*dest++ = src[2];
+					*dest++ = src[1];
+					*dest++ = src[0];
+					*dest++ = src[3];
+					src += 4;
+				}
+				src -= 8 * width;
+			}
+			break;
+	}
+
+	delete[] tempBuffer;
+	delete[] fBuffer;
+
+	return true;
+}
\ No newline at end of file
diff --git a/src_rebuild/utils/targa.h b/src_rebuild/utils/targa.h
new file mode 100644
index 00000000..12423c0b
--- /dev/null
+++ b/src_rebuild/utils/targa.h
@@ -0,0 +1,28 @@
+#ifndef TARGA_H
+#define TARGA_H
+
+#include "TYPES.H"
+
+#pragma pack (push, 1)
+
+struct TGAHeader
+{
+	u_char  descriptionlen;
+	u_char  cmaptype;
+	u_char  imagetype;
+	u_short cmapstart;
+	u_short cmapentries;
+	u_char  cmapbits;
+	u_short xoffset;
+	u_short yoffset;
+	u_short width;
+	u_short height;
+	u_char  bpp;
+	u_char  attrib;
+};
+
+#pragma pack (pop)
+
+bool LoadTGAImage(const char* filename, u_char** data, int& width, int& height, int& bpp);
+
+#endif // TARGA_H
\ No newline at end of file