Campbell Barton
de13d0a80c
While \file doesn't need an argument, it can't have another doxy command after it.
348 lines
8.4 KiB
C
348 lines
8.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*/
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/** \file
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* \ingroup imbuf
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*/
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#include "BLI_utildefines.h"
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#include "BLI_fileops.h"
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#include "imbuf.h"
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#include "IMB_imbuf_types.h"
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#include "IMB_imbuf.h"
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#include "IMB_filetype.h"
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#include "IMB_colormanagement.h"
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#include "IMB_colormanagement_intern.h"
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/* some code copied from article on microsoft.com, copied
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* here for enhanced BMP support in the future
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* http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0197/mfcp1/mfcp1.htm&nav=/msj/0197/newnav.htm
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*/
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typedef struct BMPINFOHEADER {
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unsigned int biSize;
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unsigned int biWidth;
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unsigned int biHeight;
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unsigned short biPlanes;
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unsigned short biBitCount;
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unsigned int biCompression;
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unsigned int biSizeImage;
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unsigned int biXPelsPerMeter;
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unsigned int biYPelsPerMeter;
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unsigned int biClrUsed;
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unsigned int biClrImportant;
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} BMPINFOHEADER;
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#if 0
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typedef struct BMPHEADER {
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unsigned short biType;
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unsigned int biSize;
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unsigned short biRes1;
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unsigned short biRes2;
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unsigned int biOffBits;
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} BMPHEADER;
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#endif
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#define BMP_FILEHEADER_SIZE 14
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#define CHECK_HEADER_FIELD(_mem, _field) ((_mem[0] == _field[0]) && (_mem[1] == _field[1]))
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#define CHECK_HEADER_FIELD_BMP(_mem) \
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(CHECK_HEADER_FIELD(_mem, "BM") || \
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CHECK_HEADER_FIELD(_mem, "BA") || \
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CHECK_HEADER_FIELD(_mem, "CI") || \
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CHECK_HEADER_FIELD(_mem, "CP") || \
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CHECK_HEADER_FIELD(_mem, "IC") || \
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CHECK_HEADER_FIELD(_mem, "PT"))
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static int checkbmp(const unsigned char *mem)
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{
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int ret_val = 0;
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BMPINFOHEADER bmi;
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unsigned int u;
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if (mem) {
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if (CHECK_HEADER_FIELD_BMP(mem)) {
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/* skip fileheader */
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mem += BMP_FILEHEADER_SIZE;
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}
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else {
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return 0;
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}
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/* for systems where an int needs to be 4 bytes aligned */
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memcpy(&bmi, mem, sizeof(bmi));
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u = LITTLE_LONG(bmi.biSize);
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/* we only support uncompressed images for now. */
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if (u >= sizeof(BMPINFOHEADER)) {
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if (bmi.biCompression == 0) {
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u = LITTLE_SHORT(bmi.biBitCount);
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if (u > 0 && u <= 32) {
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ret_val = 1;
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}
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}
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}
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}
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return(ret_val);
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}
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int imb_is_a_bmp(const unsigned char *buf)
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{
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return checkbmp(buf);
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}
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struct ImBuf *imb_bmp_decode(const unsigned char *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
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{
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struct ImBuf *ibuf = NULL;
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BMPINFOHEADER bmi;
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int x, y, depth, ibuf_depth, skip;
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const unsigned char *bmp;
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unsigned char *rect;
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unsigned short col;
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double xppm, yppm;
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bool top_to_bottom = false;
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(void)size; /* unused */
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if (checkbmp(mem) == 0) return(NULL);
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colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
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bmp = mem + LITTLE_LONG(*(int *)(mem + 10));
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if (CHECK_HEADER_FIELD_BMP(mem)) {
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/* skip fileheader */
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mem += BMP_FILEHEADER_SIZE;
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}
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else {
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return NULL;
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}
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/* for systems where an int needs to be 4 bytes aligned */
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memcpy(&bmi, mem, sizeof(bmi));
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skip = LITTLE_LONG(bmi.biSize);
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x = LITTLE_LONG(bmi.biWidth);
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y = LITTLE_LONG(bmi.biHeight);
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depth = LITTLE_SHORT(bmi.biBitCount);
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xppm = LITTLE_LONG(bmi.biXPelsPerMeter);
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yppm = LITTLE_LONG(bmi.biYPelsPerMeter);
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if (depth <= 8) {
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ibuf_depth = 24;
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}
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else {
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ibuf_depth = depth;
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}
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if (y < 0) {
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/* Negative height means bitmap is stored top-to-bottom... */
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y = -y;
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top_to_bottom = true;
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}
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#if 0
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printf("skip: %d, x: %d y: %d, depth: %d (%x)\n", skip, x, y, depth, bmi.biBitCount);
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#endif
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if (flags & IB_test) {
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ibuf = IMB_allocImBuf(x, y, ibuf_depth, 0);
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}
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else {
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ibuf = IMB_allocImBuf(x, y, ibuf_depth, IB_rect);
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if (!ibuf) {
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return NULL;
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}
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rect = (unsigned char *) ibuf->rect;
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if (depth <= 8) {
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const int rowsize = (depth * x + 31) / 32 * 4;
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const char (*palette)[4] = (void *)(mem + skip);
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const int startmask = ((1 << depth) - 1) << 8;
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for (size_t i = y; i > 0; i--) {
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int index;
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int bitoffs = 8;
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int bitmask = startmask;
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int nbytes = 0;
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const char *pcol;
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if (top_to_bottom) {
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rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
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}
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for (size_t j = x; j > 0; j--) {
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bitoffs -= depth;
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bitmask >>= depth;
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index = (bmp[0] & bitmask) >> bitoffs;
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pcol = palette[index];
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/* intentionally BGR -> RGB */
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rect[0] = pcol[2];
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rect[1] = pcol[1];
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rect[2] = pcol[0];
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rect[3] = 255;
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rect += 4;
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if (bitoffs == 0) {
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/* Advance to the next byte */
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bitoffs = 8;
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bitmask = startmask;
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nbytes += 1;
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bmp += 1;
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}
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}
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/* Advance to the next row */
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bmp += (rowsize - nbytes);
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}
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}
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else if (depth == 16) {
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for (size_t i = y; i > 0; i--) {
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if (top_to_bottom) {
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rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
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}
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for (size_t j = x; j > 0; j--) {
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col = bmp[0] + (bmp[1] << 8);
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rect[0] = ((col >> 10) & 0x1f) << 3;
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rect[1] = ((col >> 5) & 0x1f) << 3;
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rect[2] = ((col >> 0) & 0x1f) << 3;
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rect[3] = 255;
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rect += 4; bmp += 2;
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}
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}
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}
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else if (depth == 24) {
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const int x_pad = x % 4;
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for (size_t i = y; i > 0; i--) {
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if (top_to_bottom) {
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rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
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}
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for (size_t j = x; j > 0; j--) {
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rect[0] = bmp[2];
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rect[1] = bmp[1];
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rect[2] = bmp[0];
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rect[3] = 255;
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rect += 4; bmp += 3;
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}
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/* for 24-bit images, rows are padded to multiples of 4 */
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bmp += x_pad;
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}
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}
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else if (depth == 32) {
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for (size_t i = y; i > 0; i--) {
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if (top_to_bottom) {
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rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
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}
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for (size_t j = x; j > 0; j--) {
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rect[0] = bmp[2];
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rect[1] = bmp[1];
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rect[2] = bmp[0];
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rect[3] = bmp[3];
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rect += 4; bmp += 4;
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}
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}
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}
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}
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if (ibuf) {
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ibuf->ppm[0] = xppm;
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ibuf->ppm[1] = yppm;
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ibuf->ftype = IMB_FTYPE_BMP;
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}
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return(ibuf);
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}
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#undef CHECK_HEADER_FIELD_BMP
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#undef CHECK_HEADER_FIELD
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/* Couple of helper functions for writing our data */
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static int putIntLSB(unsigned int ui, FILE *ofile)
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{
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putc((ui >> 0) & 0xFF, ofile);
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putc((ui >> 8) & 0xFF, ofile);
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putc((ui >> 16) & 0xFF, ofile);
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return putc((ui >> 24) & 0xFF, ofile);
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}
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static int putShortLSB(unsigned short us, FILE *ofile)
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{
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putc((us >> 0) & 0xFF, ofile);
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return putc((us >> 8) & 0xFF, ofile);
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}
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/* Found write info at http://users.ece.gatech.edu/~slabaugh/personal/c/bitmapUnix.c */
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int imb_savebmp(struct ImBuf *ibuf, const char *name, int flags)
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{
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BMPINFOHEADER infoheader;
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size_t bytesize, extrabytes, ptr;
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uchar *data;
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FILE *ofile;
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(void)flags; /* unused */
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extrabytes = (4 - ibuf->x * 3 % 4) % 4;
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bytesize = (ibuf->x * 3 + extrabytes) * ibuf->y;
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data = (uchar *) ibuf->rect;
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ofile = BLI_fopen(name, "wb");
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if (!ofile) return 0;
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putShortLSB(19778, ofile); /* "BM" */
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putIntLSB(bytesize + BMP_FILEHEADER_SIZE + sizeof(infoheader), ofile); /* Total file size */
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putShortLSB(0, ofile); /* Res1 */
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putShortLSB(0, ofile); /* Res2 */
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putIntLSB(BMP_FILEHEADER_SIZE + sizeof(infoheader), ofile);
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putIntLSB(sizeof(infoheader), ofile);
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putIntLSB(ibuf->x, ofile);
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putIntLSB(ibuf->y, ofile);
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putShortLSB(1, ofile);
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putShortLSB(24, ofile);
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putIntLSB(0, ofile);
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putIntLSB(bytesize, ofile);
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putIntLSB((int)(ibuf->ppm[0] + 0.5), ofile);
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putIntLSB((int)(ibuf->ppm[1] + 0.5), ofile);
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putIntLSB(0, ofile);
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putIntLSB(0, ofile);
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/* Need to write out padded image data in bgr format */
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for (size_t y = 0; y < ibuf->y; y++) {
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for (size_t x = 0; x < ibuf->x; x++) {
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ptr = (x + y * ibuf->x) * 4;
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if (putc(data[ptr + 2], ofile) == EOF) return 0;
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if (putc(data[ptr + 1], ofile) == EOF) return 0;
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if (putc(data[ptr], ofile) == EOF) return 0;
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}
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/* add padding here */
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for (size_t t = 0; t < extrabytes; t++) {
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if (putc(0, ofile) == EOF) return 0;
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}
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}
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if (ofile) {
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fflush(ofile);
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fclose(ofile);
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}
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return 1;
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}
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