1

utils/studiomdl/bmpread.cpp

@@ -0,0 +1,98 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+
+#include <windows.h>
+#include <STDIO.H>
+
+
+int
+ReadBmpFile(
+	char* szFile,
+	unsigned char** ppbPalette,
+	unsigned char** ppbBits,
+	int *pwidth,
+	int *pheight)
+	{
+	int rc = 0;
+	FILE *pfile = NULL;
+	BITMAPFILEHEADER bmfh;
+	BITMAPINFOHEADER bmih;
+	RGBQUAD rgrgbPalette[256];
+	ULONG cbPalBytes;
+	ULONG cbBmpBits;
+	BYTE* pbBmpBits;
+
+	// Bogus parameter check
+	if (!(ppbPalette != NULL && ppbBits != NULL))
+		{ rc = -1000; goto GetOut; }
+
+	// File exists?
+	if ((pfile = fopen(szFile, "rb")) == NULL)
+		{ rc = -1; goto GetOut; }
+	
+	// Read file header
+	if (fread(&bmfh, sizeof bmfh, 1/*count*/, pfile) != 1)
+		{ rc = -2; goto GetOut; }
+
+	// Bogus file header check
+	if (!(bmfh.bfReserved1 == 0 && bmfh.bfReserved2 == 0))
+		{ rc = -2000; goto GetOut; }
+
+	// Read info header
+	if (fread(&bmih, sizeof bmih, 1/*count*/, pfile) != 1)
+		{ rc = -3; goto GetOut; }
+
+	// Bogus info header check
+	if (!(bmih.biSize == sizeof bmih && bmih.biPlanes == 1))
+		{ rc = -3000; goto GetOut; }
+
+	// Bogus bit depth?  Only 8-bit supported.
+	if (bmih.biBitCount != 8)
+		{ rc = -4; goto GetOut; }
+	
+	// Bogus compression?  Only non-compressed supported.
+	if (bmih.biCompression != BI_RGB)
+		{ rc = -5; goto GetOut; }
+
+	// Figure out how many entires are actually in the table
+	if (bmih.biClrUsed == 0)
+		{
+		cbPalBytes = (1 << bmih.biBitCount) * sizeof( RGBQUAD );
+		}
+	else 
+		{
+		cbPalBytes = bmih.biClrUsed * sizeof( RGBQUAD );
+		}
+
+	// Read palette (256 entries)
+	if (fread(rgrgbPalette, cbPalBytes, 1/*count*/, pfile) != 1)
+		{ rc = -6; goto GetOut; }
+
+	// Read bitmap bits (remainder of file)
+	cbBmpBits = bmfh.bfSize - ftell(pfile);
+	pbBmpBits = (BYTE *)malloc(cbBmpBits);
+	if (fread(pbBmpBits, cbBmpBits, 1/*count*/, pfile) != 1)
+		{ rc = -7; goto GetOut; }
+
+	// Set output parameters
+	*ppbPalette = (BYTE *)malloc(sizeof rgrgbPalette);
+	memcpy(*ppbPalette, rgrgbPalette, cbPalBytes);
+	*ppbBits = pbBmpBits;
+
+
+    *pwidth = bmih.biWidth;
+    *pheight = bmih.biHeight;
+
+	printf("w %d h %d s %d\n",bmih.biWidth, bmih.biHeight, cbBmpBits );
+
+GetOut:
+	if (pfile) fclose(pfile);
+	return rc;
+	}
+