mirror of https://github.com/axmolengine/axmol.git
301 lines
7.9 KiB
C++
301 lines
7.9 KiB
C++
/****************************************************************************
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Copyright (c) 2010 cocos2d-x.org
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include <string.h>
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#include <stdlib.h>
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#include "TGAlib.h"
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namespace cocos2d {
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// load the image header fields. We only keep those that matter!
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void tgaLoadHeader(FILE *pFile, tImageTGA *psInfo) {
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unsigned char cGarbage;
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signed short iGarbage;
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fread(&cGarbage, sizeof(unsigned char), 1, pFile);
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fread(&cGarbage, sizeof(unsigned char), 1, pFile);
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// type must be 2 or 3
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fread(&psInfo->type, sizeof(unsigned char), 1, pFile);
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fread(&iGarbage, sizeof(signed short), 1, pFile);
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fread(&iGarbage, sizeof(signed short), 1, pFile);
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fread(&cGarbage, sizeof(unsigned char), 1, pFile);
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fread(&iGarbage, sizeof(signed short), 1, pFile);
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fread(&iGarbage, sizeof(signed short), 1, pFile);
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fread(&psInfo->width, sizeof(signed short), 1, pFile);
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fread(&psInfo->height, sizeof(signed short), 1, pFile);
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fread(&psInfo->pixelDepth, sizeof(unsigned char), 1, pFile);
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fread(&cGarbage, sizeof(unsigned char), 1, pFile);
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psInfo->flipped = 0;
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if ( cGarbage & 0x20 )
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{
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psInfo->flipped = 1;
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}
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}
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// loads the image pixels. You shouldn't call this function directly
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void tgaLoadImageData(FILE *pFile, tImageTGA *psInfo) {
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int mode,total,i;
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unsigned char aux;
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// mode equal the number of components for each pixel
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mode = psInfo->pixelDepth / 8;
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// total is the number of unsigned chars we'll have to read
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total = psInfo->height * psInfo->width * mode;
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fread(psInfo->imageData,sizeof(unsigned char),total,pFile);
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// mode=3 or 4 implies that the image is RGB(A). However TGA
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// stores it as BGR(A) so we'll have to swap R and B.
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if (mode >= 3)
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for (i=0; i < total; i+= mode) {
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aux = psInfo->imageData[i];
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psInfo->imageData[i] = psInfo->imageData[i+2];
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psInfo->imageData[i+2] = aux;
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}
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}
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// loads the RLE encoded image pixels. You shouldn't call this function directly
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void tgaLoadRLEImageData(FILE *pFile, tImageTGA *psInfo)
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{
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unsigned int mode,total,i, index = 0;
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unsigned char aux[4], runlength = 0;
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unsigned int skip = 0, flag = 0;
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// mode equal the number of components for each pixel
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mode = psInfo->pixelDepth / 8;
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// total is the number of unsigned chars we'll have to read
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total = psInfo->height * psInfo->width;
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for( i = 0; i < total; i++ )
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{
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// if we have a run length pending, run it
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if ( runlength != 0 )
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{
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// we do, update the run length count
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runlength--;
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skip = (flag != 0);
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}
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else
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{
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// otherwise, read in the run length token
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if ( fread(&runlength,sizeof(unsigned char),1,pFile) != 1 )
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return;
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// see if it's a RLE encoded sequence
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flag = runlength & 0x80;
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if ( flag ) runlength -= 128;
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skip = 0;
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}
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// do we need to skip reading this pixel?
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if ( !skip )
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{
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// no, read in the pixel data
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if ( fread(aux,sizeof(unsigned char),mode,pFile) != mode )
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return;
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// mode=3 or 4 implies that the image is RGB(A). However TGA
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// stores it as BGR(A) so we'll have to swap R and B.
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if ( mode >= 3 )
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{
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unsigned char tmp;
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tmp = aux[0];
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aux[0] = aux[2];
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aux[2] = tmp;
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}
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}
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// add the pixel to our image
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memcpy(&psInfo->imageData[index], aux, mode);
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index += mode;
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}
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}
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void tgaFlipImage( tImageTGA *psInfo )
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{
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// mode equal the number of components for each pixel
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int mode = psInfo->pixelDepth / 8;
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int rowbytes = psInfo->width*mode;
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unsigned char *row = (unsigned char *)malloc(rowbytes);
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int y;
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if (row == NULL) return;
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for( y = 0; y < (psInfo->height/2); y++ )
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{
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memcpy(row, &psInfo->imageData[y*rowbytes],rowbytes);
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memcpy(&psInfo->imageData[y*rowbytes], &psInfo->imageData[(psInfo->height-(y+1))*rowbytes], rowbytes);
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memcpy(&psInfo->imageData[(psInfo->height-(y+1))*rowbytes], row, rowbytes);
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}
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free(row);
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psInfo->flipped = 0;
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}
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// this is the function to call when we want to load an image
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tImageTGA * tgaLoad(const char *pszFilename) {
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FILE *file;
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tImageTGA *info;
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int mode,total;
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// allocate memory for the info struct and check!
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info = (tImageTGA *)malloc(sizeof(tImageTGA));
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if (info == NULL)
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return(NULL);
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// open the file for reading (binary mode)
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if(!(file = fopen(pszFilename, "rb")))
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{
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free(info);
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return NULL;
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}
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if (file == NULL) {
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info->status = TGA_ERROR_FILE_OPEN;
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return(info);
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}
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// load the header
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tgaLoadHeader(file,info);
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// check for errors when loading the header
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if (ferror(file)) {
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info->status = TGA_ERROR_READING_FILE;
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fclose(file);
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return(info);
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}
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// check if the image is color indexed
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if (info->type == 1) {
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info->status = TGA_ERROR_INDEXED_COLOR;
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fclose(file);
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return(info);
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}
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// check for other types (compressed images)
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if ((info->type != 2) && (info->type !=3) && (info->type !=10) ) {
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info->status = TGA_ERROR_COMPRESSED_FILE;
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fclose(file);
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return(info);
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}
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// mode equals the number of image components
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mode = info->pixelDepth / 8;
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// total is the number of unsigned chars to read
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total = info->height * info->width * mode;
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// allocate memory for image pixels
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info->imageData = (unsigned char *)malloc(sizeof(unsigned char) *
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total);
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// check to make sure we have the memory required
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if (info->imageData == NULL) {
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info->status = TGA_ERROR_MEMORY;
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fclose(file);
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return(info);
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}
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// finally load the image pixels
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if ( info->type == 10 )
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tgaLoadRLEImageData(file, info);
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else
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tgaLoadImageData(file,info);
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// check for errors when reading the pixels
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if (ferror(file)) {
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info->status = TGA_ERROR_READING_FILE;
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fclose(file);
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return(info);
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}
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fclose(file);
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info->status = TGA_OK;
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if ( info->flipped )
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{
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tgaFlipImage( info );
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if ( info->flipped ) info->status = TGA_ERROR_MEMORY;
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}
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return(info);
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}
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// converts RGB to greyscale
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void tgaRGBtogreyscale(tImageTGA *psInfo) {
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int mode,i,j;
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unsigned char *newImageData;
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// if the image is already greyscale do nothing
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if (psInfo->pixelDepth == 8)
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return;
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// compute the number of actual components
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mode = psInfo->pixelDepth / 8;
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// allocate an array for the new image data
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newImageData = (unsigned char *)malloc(sizeof(unsigned char) *
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psInfo->height * psInfo->width);
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if (newImageData == NULL) {
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return;
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}
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// convert pixels: greyscale = o.30 * R + 0.59 * G + 0.11 * B
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for (i = 0,j = 0; j < psInfo->width * psInfo->height; i +=mode, j++)
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newImageData[j] =
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(unsigned char)(0.30 * psInfo->imageData[i] +
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0.59 * psInfo->imageData[i+1] +
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0.11 * psInfo->imageData[i+2]);
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//free old image data
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free(psInfo->imageData);
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// reassign pixelDepth and type according to the new image type
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psInfo->pixelDepth = 8;
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psInfo->type = 3;
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// reassing imageData to the new array.
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psInfo->imageData = newImageData;
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}
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// releases the memory used for the image
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void tgaDestroy(tImageTGA *psInfo) {
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if (psInfo != NULL) {
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if (psInfo->imageData != NULL)
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{
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free(psInfo->imageData);
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}
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free(psInfo);
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}
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}
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}//namespace cocos2d
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