diff options
Diffstat (limited to 'source/blender/imbuf/intern/bmp_decode.c')
| -rw-r--r-- | source/blender/imbuf/intern/bmp_decode.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/source/blender/imbuf/intern/bmp_decode.c b/source/blender/imbuf/intern/bmp_decode.c new file mode 100644 index 00000000000..d8b38f367e0 --- /dev/null +++ b/source/blender/imbuf/intern/bmp_decode.c @@ -0,0 +1,191 @@ +/** + * $Id$ + * + * ***** BEGIN GPL/BL DUAL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL/BL DUAL LICENSE BLOCK ***** + */ + +#ifdef _WIN32 +#include "BLI_winstuff.h" +#endif +#include "BLI_blenlib.h" + +#include "imbuf.h" +#include "imbuf_patch.h" + +#include "IMB_imbuf_types.h" +#include "IMB_imbuf.h" + +#include "IMB_allocimbuf.h" +#include "IMB_cmap.h" +#include "IMB_bmp.h" + + +// some code copied from article on microsoft.com, copied +// here for enhanced BMP support in the future +// http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0197/mfcp1/mfcp1.htm&nav=/msj/0197/newnav.htm + +/* +LPBYTE CDib::GetBits() + { + return (LPBYTE)m_pbmih + // start of bitmap + + m_pbmih->biSize + // size of header + + GetNumPaletteColors() // (num colors * + *sizeof(RGBQUAD); // size each entry) + } + +UINT CDib::GetNumPaletteColors() + { + UINT nColors=m_pbmih->biClrUsed; + if (nColors==0 && m_pbmih->biBitCount<=8) + nColors = 1<<m_pbmih->biBitCount; + return nColors; + } + +*/ + +typedef struct BMPINFOHEADER{ + unsigned int biSize; + int biWidth; + int biHeight; + unsigned short biPlanes; + unsigned short biBitCount; + unsigned int biCompression; + unsigned int biSizeImage; + int biXPelsPerMeter; + int biYPelsPerMeter; + unsigned int biClrUsed; + unsigned int biClrImportant; +} BMPINFOHEADER; + +#define BMP_FILEHEADER_SIZE 14 + +static int checkbmp(unsigned char *mem) +{ + int ret_val = 0; + BMPINFOHEADER bmi; + unsigned int u; + + if (mem) { + if ((mem[0] == 'B') && (mem[1] == 'M')) { + // skip fileheader + mem += BMP_FILEHEADER_SIZE; + } + + // for systems where an int needs to be 4 bytes aligned + memcpy(&bmi, mem, sizeof(bmi)); + + u = LITTLE_LONG(bmi.biSize); + // we only support uncompressed 24 or 32 bits images for now + if (u >= sizeof(BMPINFOHEADER)) { + if ((bmi.biCompression == 0) && (bmi.biClrUsed == 0)) { + u = LITTLE_SHORT(bmi.biBitCount); + if (u >= 16) { + ret_val = 1; + } + } + } + } + + return(ret_val); +} + +int imb_is_a_bmp(void *buf) { + + return checkbmp(buf); +} + +struct ImBuf *imb_bmp_decode(unsigned char *mem, int size, int flags) +{ + struct ImBuf *ibuf = 0; + BMPINFOHEADER bmi; + int x, y, depth, skip, i; + unsigned char *bmp, *rect; + unsigned short col; + + if (checkbmp(mem) == 0) return(0); + + if ((mem[0] == 'B') && (mem[1] == 'M')) { + // skip fileheader + mem += BMP_FILEHEADER_SIZE; + } + + // for systems where an int needs to be 4 bytes aligned + memcpy(&bmi, mem, sizeof(bmi)); + + skip = LITTLE_LONG(bmi.biSize); + x = LITTLE_LONG(bmi.biWidth); + y = LITTLE_LONG(bmi.biHeight); + depth = LITTLE_SHORT(bmi.biBitCount); + + // printf("skip: %d, x: %d y: %d, depth: %d (%x)\n", skip, x, y, depth, bmi.biBitCount); + if (flags & IB_test) { + ibuf = IMB_allocImBuf(x, y, depth, 0, 0); + } else { + ibuf = IMB_allocImBuf(x, y, depth, IB_rect, 0); + bmp = mem + skip; + rect = (unsigned char *) ibuf->rect; + + if (depth == 16) { + for (i = x * y; i > 0; i--) { + col = bmp[0] + (bmp[1] << 8); + rect[0] = ((col >> 10) & 0x1f) << 3; + rect[1] = ((col >> 5) & 0x1f) << 3; + rect[2] = ((col >> 0) & 0x1f) << 3; + + rect[3] = 255; + rect += 4; bmp += 2; + } + + } else if (depth == 24) { + for (i = x * y; i > 0; i--) { + rect[0] = bmp[2]; + rect[1] = bmp[1]; + rect[2] = bmp[0]; + + rect[3] = 255; + rect += 4; bmp += 3; + } + } else if (depth == 32) { + for (i = x * y; i > 0; i--) { + rect[0] = bmp[0]; + rect[1] = bmp[1]; + rect[2] = bmp[2]; + rect[3] = bmp[3]; + rect += 4; bmp += 4; + } + } + } + + if (ibuf) { + ibuf->ftype = BMP; + } + + return(ibuf); +} + |