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tga.cpp File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "shared.h"
#include "tga.h"
#include "mmgr.h"

Go to the source code of this file.

Functions
void	tgaLoadHeader (FILE *file, tgaInfo *info)
void	tgaLoadImageData (FILE *file, tgaInfo *info)
tgaInfo *	tgaLoad (char *filename)
void	tgaRGBtogreyscale (tgaInfo *info)
int	tgaGrabScreenSeries (char *filename, int xmin, int ymin, int xmax, int ymax)
int	tgaSave (char *filename, short int width, short int height, unsigned char pixelDepth, unsigned char *imageData)
int	tgaSaveSeries (char *filename, short int width, short int height, unsigned char pixelDepth, unsigned char *imageData)
void	tgaDestroy (tgaInfo *info)
Variables
int	savedImages = 0

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Function Documentation

void tgaDestroy (  tgaInfo *    info )

Definition at line 291 of file tga.cpp. References tgaInfo::imageData. { if (info != NULL) { free(info->imageData); free(info); } }

int tgaGrabScreenSeries (  char *    filename, int    xmin, int    ymin, int    xmax, int    ymax )

Definition at line 182 of file tga.cpp. References tgaSaveSeries(). { int w, h; unsigned char *imageData; // compute width and heidth of the image w = xmax - xmin; h = ymax - ymin; // allocate memory for the pixels imageData = (unsigned char *)malloc(sizeof(unsigned char) * w * h * 4); // read the pixels from the frame buffer glReadPixels(xmin,ymin,xmax,ymax,GL_RGBA,GL_UNSIGNED_BYTE, (void *)imageData); // save the image return (tgaSaveSeries(filename,(short int)w,(short int)h,32,imageData)); }

tgaInfo* tgaLoad (  char *    filename )

Definition at line 72 of file tga.cpp. References tgaInfo::height, tgaInfo::imageData, tgaInfo::pixelDepth, tgaInfo::status, TGA_ERROR_COMPRESSED_FILE, TGA_ERROR_FILE_OPEN, TGA_ERROR_INDEXED_COLOR, TGA_ERROR_MEMORY, TGA_ERROR_READING_FILE, TGA_OK, tgaLoadHeader(), tgaLoadImageData(), tgaInfo::type, and tgaInfo::width. { FILE *file; tgaInfo *info; int mode,total; // allocate memory for the info struct and check! info = (tgaInfo *)malloc(sizeof(tgaInfo)); if (info == NULL) return(NULL); // open the file for reading (binary mode) file = fopen(filename, "rb"); if (file == NULL) { info->status = TGA_ERROR_FILE_OPEN; return(info); } // load the header tgaLoadHeader(file,info); // check for errors when loading the header if (ferror(file)) { info->status = TGA_ERROR_READING_FILE; fclose(file); return(info); } // check if the image is color indexed if (info->type == 1) { info->status = TGA_ERROR_INDEXED_COLOR; fclose(file); return(info); } // check for other types (compressed images) if ((info->type != 2) && (info->type !=3)) { info->status = TGA_ERROR_COMPRESSED_FILE; fclose(file); return(info); } // mode equals the number of image components mode = info->pixelDepth / 8; // total is the number of bytes to read total = info->height * info->width * mode; // allocate memory for image pixels info->imageData = (unsigned char *)malloc(sizeof(unsigned char) * total); // check to make sure we have the memory required if (info->imageData == NULL) { info->status = TGA_ERROR_MEMORY; fclose(file); return(info); } // finally load the image pixels tgaLoadImageData(file,info); // check for errors when reading the pixels if (ferror(file)) { info->status = TGA_ERROR_READING_FILE; fclose(file); return(info); } fclose(file); info->status = TGA_OK; return(info); }

void tgaLoadHeader (  FILE *    file, tgaInfo *    info )

Definition at line 22 of file tga.cpp. References tgaInfo::height, tgaInfo::pixelDepth, tgaInfo::type, and tgaInfo::width. Referenced by tgaLoad(). { unsigned char cGarbage; short int iGarbage; fread(&cGarbage, sizeof(unsigned char), 1, file); fread(&cGarbage, sizeof(unsigned char), 1, file); // type must be 2 or 3 fread(&info->type, sizeof(unsigned char), 1, file); fread(&iGarbage, sizeof(short int), 1, file); fread(&iGarbage, sizeof(short int), 1, file); fread(&cGarbage, sizeof(unsigned char), 1, file); fread(&iGarbage, sizeof(short int), 1, file); fread(&iGarbage, sizeof(short int), 1, file); fread(&info->width, sizeof(short int), 1, file); fread(&info->height, sizeof(short int), 1, file); fread(&info->pixelDepth, sizeof(unsigned char), 1, file); fread(&cGarbage, sizeof(unsigned char), 1, file); }

void tgaLoadImageData (  FILE *    file, tgaInfo *    info )

Definition at line 48 of file tga.cpp. References tgaInfo::height, tgaInfo::imageData, tgaInfo::pixelDepth, and tgaInfo::width. Referenced by tgaLoad(). { int mode,total,i; unsigned char aux; // mode equal the number of components for each pixel mode = info->pixelDepth / 8; // total is the number of bytes we'll have to read total = info->height * info->width * mode; fread(info->imageData,sizeof(unsigned char),total,file); // mode=3 or 4 implies that the image is RGB(A). However TGA // stores it as BGR(A) so we'll have to swap R and B. if (mode >= 3) for (i=0; i < total; i+= mode) { aux = info->imageData[i]; info->imageData[i] = info->imageData[i+2]; info->imageData[i+2] = aux; } }

void tgaRGBtogreyscale (  tgaInfo *    info )

Definition at line 143 of file tga.cpp. References tgaInfo::height, tgaInfo::imageData, tgaInfo::pixelDepth, tgaInfo::type, and tgaInfo::width. { int mode,i,j; unsigned char *newImageData; // if the image is already greyscale do nothing if (info->pixelDepth == 8) return; // compute the number of actual components mode = info->pixelDepth / 8; // allocate an array for the new image data newImageData = (unsigned char *)malloc(sizeof(unsigned char) * info->height * info->width); if (newImageData == NULL) { return; } // convert pixels: greyscale = o.30 * R + 0.59 * G + 0.11 * B for (i = 0,j = 0; j < info->width * info->height; i +=mode, j++) newImageData[j] = (unsigned char)(0.30 * info->imageData[i] + 0.59 * info->imageData[i+1] + 0.11 * info->imageData[i+2]); //free old image data free(info->imageData); // reassign pixelDepth and type according to the new image type info->pixelDepth = 8; info->type = 3; // reassing imageData to the new array. info->imageData = newImageData; }

int tgaSave (  char *    filename, short int    width, short int    height, unsigned char    pixelDepth, unsigned char *    imageData )

Definition at line 205 of file tga.cpp. Referenced by CreateLightmaps(), and tgaSaveSeries(). { unsigned char cGarbage = 0, type,mode,aux; short int iGarbage = 0; int i; FILE *file; // open file and check for errors file = fopen(filename, "wb"); if (file == NULL) { return(TGA_ERROR_FILE_OPEN); } // compute image type: 2 for RGB(A), 3 for greyscale mode = (unsigned char)(pixelDepth / 8); if ((pixelDepth == 24) || (pixelDepth == 32)) type = 2; else type = 3; // write the header fwrite(&cGarbage, sizeof(unsigned char), 1, file); fwrite(&cGarbage, sizeof(unsigned char), 1, file); fwrite(&type, sizeof(unsigned char), 1, file); fwrite(&iGarbage, sizeof(short int), 1, file); fwrite(&iGarbage, sizeof(short int), 1, file); fwrite(&cGarbage, sizeof(unsigned char), 1, file); fwrite(&iGarbage, sizeof(short int), 1, file); fwrite(&iGarbage, sizeof(short int), 1, file); fwrite(&width, sizeof(short int), 1, file); fwrite(&height, sizeof(short int), 1, file); fwrite(&pixelDepth, sizeof(unsigned char), 1, file); fwrite(&cGarbage, sizeof(unsigned char), 1, file); // convert the image data from RGB(a) to BGR(A) if (mode >= 3) for (i=0; i < width * height * mode ; i+= mode) { aux = imageData[i]; imageData[i] = imageData[i+2]; imageData[i+2] = aux; } // save the image data fwrite(imageData, sizeof(unsigned char), width * height * mode, file); fclose(file); // release the memory // free(imageData); return(TGA_OK); }

int tgaSaveSeries (  char *    filename, short int    width, short int    height, unsigned char    pixelDepth, unsigned char *    imageData )

Definition at line 266 of file tga.cpp. References savedImages, and tgaSave(). Referenced by tgaGrabScreenSeries(). { char *newFilename; int status; // compute the new filename by adding the // series number and the extension newFilename = (char *)malloc(sizeof(char) * strlen(filename)+8); sprintf(newFilename,"%s%d.tga",filename,savedImages); // save the image status = tgaSave(newFilename,width,height,pixelDepth,imageData); //increase the counter savedImages++; return(status); }

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Variable Documentation

int savedImages = 0 [static]

Definition at line 19 of file tga.cpp. Referenced by tgaSaveSeries().

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