kc3-lang/angle/samples/gles2_book/Common/Win32/esUtil_TGA.c

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• Author : alokp@chromium.org
  Date : 2010-04-07 19:57:20
  Hash : 0270ef14
  Message : Changed the default character set to be UNICODE, the same as chromium. Changes to fix compile errors and warnings. Review URL: http://codereview.appspot.com/816046 git-svn-id: https://angleproject.googlecode.com/svn/trunk@103 736b8ea6-26fd-11df-bfd4-992fa37f6226

• samples/gles2_book/Common/Win32/esUtil_TGA.c

• //
  // Book:      OpenGL(R) ES 2.0 Programming Guide
  // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
  // ISBN-10:   0321502795
  // ISBN-13:   9780321502797
  // Publisher: Addison-Wesley Professional
  // URLs:      http://safari.informit.com/9780321563835
  //            http://www.opengles-book.com
  //
  
  // esUtil_TGA.c
  //
  //    This file contains the Win32 implementation of a TGA image loader
  
  #include <windows.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  ///
  //  Macros
  //
  #define INVERTED_BIT            (1 << 5)
  
  ///
  //  Types
  //
  #pragma pack(push,x1)                            // Byte alignment (8-bit)
  #pragma pack(1)
  
  typedef struct
  {
     unsigned char  IdSize,
                    MapType,
                    ImageType;
     unsigned short PaletteStart,
                    PaletteSize;
     unsigned char  PaletteEntryDepth;
     unsigned short X,
                    Y,
                    Width,
                    Height;
     unsigned char  ColorDepth,
                    Descriptor;
           
  } TGA_HEADER;
  
  #pragma pack(pop,x1)
  
  ////////////////////////////////////////////////////////////////////////////////////
  //
  //  Private Functions
  //
  
  ////////////////////////////////////////////////////////////////////////////////////
  //
  //  Public Functions
  //
  //
  
  
  ///
  //  WinTGALoad()
  //
  int WinTGALoad( const char *fileName, char **buffer, int *width, int *height )
  {
     FILE        *fp;
     TGA_HEADER   Header;
  
     if ( fopen_s ( &fp, fileName, "rb" ) != 0 )
     {
        return FALSE;
     }
  
     if ( fp == NULL )
     {
        return FALSE;
     }
  
     fread ( &Header, sizeof(TGA_HEADER), 1, fp );
  
     *width = Header.Width;
     *height = Header.Height;
     
     if ( Header.ColorDepth == 24 )
     {
        RGBTRIPLE *Buffer24;
  
        Buffer24= (RGBTRIPLE*)malloc(sizeof(RGBTRIPLE) * (*width) * (*height));
  
        if(Buffer24)
        {
           int i=0;
           int x,
               y;
  
           fread(Buffer24, sizeof(RGBTRIPLE), (*width) * (*height), fp);
  
           *buffer= (LPSTR) malloc(3 * (*width) * (*height));
  
           for ( y = 0; y < *height; y++ )
              for( x = 0; x < *width; x++ )
              {
                 int Index= y * (*width) + x;
  
                 if(!(Header.Descriptor & INVERTED_BIT))
                    Index= ((*height) - 1 - y) * (*width) + x;
  
                 (*buffer)[(i * 3)]=      Buffer24[Index].rgbtRed;
                 (*buffer)[(i * 3) + 1]=  Buffer24[Index].rgbtGreen;
                 (*buffer)[(i * 3) + 2]=  Buffer24[Index].rgbtBlue;
          
                 i++;
              }
           
           fclose(fp);
           free(Buffer24);
           return(TRUE);
        }		
     }
  
     return(FALSE);
  }