403 lines
8.8 KiB
C++
403 lines
8.8 KiB
C++
/*
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Copyright (C) 1999-2007 id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "bmp.h"
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#include "image.h"
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static void BMPLineNone(FILE *f, char *sline, int pixbytes, int width)
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{
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int nbytes, i, k, j;
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switch (pixbytes)
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{
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case 1 :
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nbytes = (width + 3) / 4;
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nbytes *= 4;
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fread(sline, width, 1, f);
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nbytes -= width;
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while (nbytes-- > 0) fgetc(f);
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return;
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case 3 :
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nbytes = ((width * 3) + 3) / 4;
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nbytes *= 4;
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fread(sline, width, 3, f);
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nbytes -= width * 3;
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while (nbytes-- > 0) fgetc(f);
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// reorder bgr to rgb
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for (i = 0, j = 0; i < width; i++, j += 3)
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{
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k = sline[j];
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sline[j] = sline[j+2];
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sline[j+2] = k;
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}
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return;
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}
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Error("BMPLineNone failed.");
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}
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static void BMPLineRLE8(FILE *f, char *sline, int pixbytes, int width)
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{
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Error("RLE8 not yet supported.");
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}
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static void BMPLineRLE4(FILE *f, char *sline, int pixbytes, int width)
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{
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Error("RLE4 not yet supported.");
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}
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static void BMPLine(FILE *f, char *scanline, int pixbytes, int width, int rle)
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{
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switch (rle)
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{
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case xBI_NONE : BMPLineNone(f, scanline, pixbytes, width); return;
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case xBI_RLE8 : BMPLineRLE8(f, scanline, pixbytes, width); return;
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case xBI_RLE4 : BMPLineRLE4(f, scanline, pixbytes, width); return;
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}
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Error("Unknown compression type.");
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}
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/*
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static void PrintHeader(binfo_t *b)
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{
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printf("biSize : %ld\n", b->biSize);
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printf("biWidth : %ld\n", b->biWidth);
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printf("biHeight : %ld\n", b->biHeight);
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printf("biPlanes : %d\n", b->biPlanes);
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printf("biBitCount : %d\n", b->biBitCount);
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printf("biCompression : %ld\n", b->biCompression);
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printf("biSizeImage : %ld\n", b->biSizeImage);
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printf("biXPelsPerMeter: %ld\n", b->biXPelsPerMeter);
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printf("biYPelsPerMeter: %ld\n", b->biYPelsPerMeter);
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printf("biClrUsed : %ld\n", b->biClrUsed);
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printf("biClrImportant : %ld\n", b->biClrImportant);
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}
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*/
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// FIXME: calls to Error(const char *, ... ) are dependant on qe3.cpp
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void LoadBMP(char *filename, bitmap_t *bit)
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{
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FILE *f;
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bmphd_t bhd;
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binfo_t info;
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// int pxlsize = 1;
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int rowbytes, i, pixbytes;
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char *scanline;
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// open file
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if ((f = fopen(filename, "rb")) == NULL)
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{
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Error("Unable to open file");// %s.", filename);
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}
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// read in bitmap header
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if (fread(&bhd, sizeof(bhd), 1, f) != 1)
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{
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fclose(f);
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Error("Unable to read in bitmap header.");
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}
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// make sure we have a valid bitmap file
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if (bhd.bfType != BMP_SIGNATURE_WORD)
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{
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fclose(f);
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Error("Invalid BMP file");//: %s", filename);
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}
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// load in info header
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if (fread(&info, sizeof(info), 1, f) != 1)
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{
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fclose(f);
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Error("Unable to read bitmap info header.");
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}
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// make sure this is an info type of bitmap
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if (info.biSize != sizeof(binfo_t))
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{
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fclose(f);
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Error("We only support the info bitmap type.");
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}
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// PrintHeader(&info);
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bit->bpp = info.biBitCount;
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bit->width = info.biWidth;
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bit->height = info.biHeight;
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bit->data = NULL;
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bit->palette = NULL;
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//currently we only read in 8 and 24 bit bmp files
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if (info.biBitCount == 8) pixbytes = 1;
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else if (info.biBitCount == 24) pixbytes = 3;
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else
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{
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Error("Only 8BPP and 24BPP supported");
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//Error("BPP %d not supported.", info.biBitCount);
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}
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// if this is an eight bit image load palette
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if (pixbytes == 1)
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{
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drgb_t q;
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bit->palette = reinterpret_cast<rgb_t*>(g_malloc(sizeof(rgb_t) * 256));
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for (i = 0; i < 256; i++)
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{
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if (fread(&q, sizeof(drgb_t), 1, f) != 1)
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{
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fclose(f); g_free(bit->palette);
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Error("Unable to read palette.");
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}
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bit->palette[i].r = q.red;
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bit->palette[i].g = q.green;
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bit->palette[i].b = q.blue;
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}
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}
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// position to start of bitmap
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fseek(f, bhd.bfOffBits, SEEK_SET);
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// create scanline to read data into
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rowbytes = ((info.biWidth * pixbytes) + 3) / 4;
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rowbytes *= 4;
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scanline = reinterpret_cast<char*>(g_malloc(rowbytes));
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// alloc space for new bitmap
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bit->data = reinterpret_cast<unsigned char*>(g_malloc(info.biWidth * pixbytes * info.biHeight));
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// read in image
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for (i = 0; i < info.biHeight; i++)
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{
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BMPLine(f, scanline, pixbytes, info.biWidth, info.biCompression);
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// store line
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memcpy(&bit->data[info.biWidth * pixbytes * (info.biHeight - i - 1)], scanline, info.biWidth * pixbytes);
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}
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g_free(scanline);
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fclose(f);
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}
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static void BMPEncodeLine(FILE *f, unsigned char *data, int npxls, int pixbytes)
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{
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int nbytes, i, j, k;
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switch (pixbytes)
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{
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case 1 :
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nbytes = (npxls + 3) / 4;
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nbytes *= 4;
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fwrite(data, npxls, 1, f);
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nbytes -= npxls;
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while (nbytes-- > 0) fputc(0, f);
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return;
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case 3 :
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// reorder rgb to bgr
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for (i = 0, j = 0; i < npxls; i++, j+= 3)
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{
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k = data[j];
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data[j] = data[j + 2];
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data[j + 2] = k;
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}
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nbytes = ((npxls * 3) + 3) / 4;
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nbytes *= 4;
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fwrite(data, npxls, 3, f);
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nbytes -= npxls * 3;
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while (nbytes-- > 0) fputc(0, f);
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return;
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}
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Error("BMPEncodeLine Failed.");
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}
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void WriteBMP(char *filename, bitmap_t *bit)
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{
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FILE *f;
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bmphd_t header;
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binfo_t info;
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drgb_t q; // palette that gets written
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long bmofs;
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int w, h, i;
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int pixbytes;
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if (bit->bpp == 8) pixbytes = 1;
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else if (bit->bpp == 24) pixbytes = 3;
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else
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{
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Error("Only 8BPP and 24BPP supported");
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//Error("BPP %d not supported.", bit->bpp);
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}
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if ((f = fopen(filename, "wb")) == NULL)
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{
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Error("Unable to open file");//%s.", filename);
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}
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// write out an empty header as a place holder
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if (fwrite(&header, sizeof(header), 1, f) != 1)
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{
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Error("Unable to fwrite.");
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}
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// init and write info header
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info.biSize = sizeof(binfo_t);
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info.biWidth = bit->width;
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info.biHeight = bit->height;
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info.biPlanes = 1;
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info.biBitCount = bit->bpp;
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info.biCompression = xBI_NONE;
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info.biSizeImage = bit->width * bit->height;
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info.biXPelsPerMeter = 0;
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info.biYPelsPerMeter = 0;
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info.biClrUsed = 256;
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info.biClrImportant = 256;
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if (fwrite(&info, sizeof(binfo_t), 1, f) != 1)
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{
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Error("fwrite failed.");
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}
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// write out palette if we need to
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if (bit->bpp == 8)
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{
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for (i = 0; i < 256; i++)
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{
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q.red = bit->palette[i].r;
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q.green = bit->palette[i].g;
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q.blue = bit->palette[i].b;
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fwrite(&q, sizeof(q), 1, f);
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}
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}
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// save offset to start of bitmap
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bmofs = ftell(f);
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// output bitmap
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w = bit->width;
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h = bit->height;
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for (i = h - 1; i >= 0; i--)
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{
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BMPEncodeLine(f, &bit->data[w * pixbytes * i], w, pixbytes);
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}
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// update and rewrite file header
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header.bfType = BMP_SIGNATURE_WORD;
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header.bfSize = ftell(f);
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header.bfOffBits = bmofs;
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fseek(f, 0L, SEEK_SET);
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fwrite(&header, sizeof(header), 1, f);
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fclose(f);
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}
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void NewBMP(int width, int height, int bpp, bitmap_t *bit)
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{
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int pixbytes;
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if (bpp == 8) pixbytes = 1;
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else if (bpp == 24) pixbytes = 3;
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else
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{
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Error("NewBMP: 8 or 24 bit only.");
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}
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bit->bpp = bpp;
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bit->width = width;
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bit->height = height;
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bit->data = reinterpret_cast<unsigned char*>(g_malloc(width * height * pixbytes));
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if (bit->data == NULL)
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{
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Error("NewBMP: g_malloc failed.");
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}
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// see if we need to create a palette
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if (pixbytes == 1)
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{
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bit->palette = (rgb_t *) g_malloc(768);
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if (bit->palette == NULL)
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{
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Error("NewBMP: unable to g_malloc palette.");
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}
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}
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else
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{
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bit->palette = NULL;
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}
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}
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void FreeBMP(bitmap_t *bitmap)
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{
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if (bitmap->palette)
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{
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g_free(bitmap->palette);
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bitmap->palette = NULL;
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}
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if (bitmap->data)
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{
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g_free(bitmap->data);
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bitmap->data = NULL;
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}
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}
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