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/*
* ***** BEGIN GPL 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 LICENSE BLOCK *****
*/
/** \file blender/imbuf/intern/bmp.c
* \ingroup imbuf
*/
#include "BLI_utildefines.h"
#include "BLI_fileops.h"
#include "imbuf.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_filetype.h"
#include "IMB_colormanagement.h"
#include "IMB_colormanagement_intern.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
*/
typedef struct BMPINFOHEADER {
unsigned int biSize;
unsigned int biWidth;
unsigned int biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
unsigned int biXPelsPerMeter;
unsigned int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} BMPINFOHEADER;
#if 0
typedef struct BMPHEADER {
unsigned short biType;
unsigned int biSize;
unsigned short biRes1;
unsigned short biRes2;
unsigned int biOffBits;
} BMPHEADER;
#endif
#define BMP_FILEHEADER_SIZE 14
#define CHECK_HEADER_FIELD(_mem, _field) ((_mem[0] == _field[0]) && (_mem[1] == _field[1]))
#define CHECK_HEADER_FIELD_BMP(_mem) \
(CHECK_HEADER_FIELD(_mem, "BM") || \
CHECK_HEADER_FIELD(_mem, "BA") || \
CHECK_HEADER_FIELD(_mem, "CI") || \
CHECK_HEADER_FIELD(_mem, "CP") || \
CHECK_HEADER_FIELD(_mem, "IC") || \
CHECK_HEADER_FIELD(_mem, "PT"))
static int checkbmp(const unsigned char *mem)
{
int ret_val = 0;
BMPINFOHEADER bmi;
unsigned int u;
if (mem) {
if (CHECK_HEADER_FIELD_BMP(mem)) {
/* skip fileheader */
mem += BMP_FILEHEADER_SIZE;
}
else {
return 0;
}
/* 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 images for now. */
if (u >= sizeof(BMPINFOHEADER)) {
if (bmi.biCompression == 0) {
u = LITTLE_SHORT(bmi.biBitCount);
if (u > 0 && u <= 32) {
ret_val = 1;
}
}
}
}
return(ret_val);
}
int imb_is_a_bmp(const unsigned char *buf)
{
return checkbmp(buf);
}
struct ImBuf *imb_bmp_decode(const unsigned char *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
{
struct ImBuf *ibuf = NULL;
BMPINFOHEADER bmi;
int x, y, depth, ibuf_depth, skip, i, j;
const unsigned char *bmp;
unsigned char *rect;
unsigned short col;
double xppm, yppm;
bool top_to_bottom = false;
(void)size; /* unused */
if (checkbmp(mem) == 0) return(NULL);
colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
bmp = mem + LITTLE_LONG(*(int *)(mem + 10));
if (CHECK_HEADER_FIELD_BMP(mem)) {
/* skip fileheader */
mem += BMP_FILEHEADER_SIZE;
}
else {
return NULL;
}
/* 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);
xppm = LITTLE_LONG(bmi.biXPelsPerMeter);
yppm = LITTLE_LONG(bmi.biYPelsPerMeter);
if (depth <= 8) {
ibuf_depth = 24;
}
else {
ibuf_depth = depth;
}
if (y < 0) {
/* Negative height means bitmap is stored top-to-bottom... */
y = -y;
top_to_bottom = true;
}
#if 0
printf("skip: %d, x: %d y: %d, depth: %d (%x)\n", skip, x, y, depth, bmi.biBitCount);
#endif
if (flags & IB_test) {
ibuf = IMB_allocImBuf(x, y, ibuf_depth, 0);
}
else {
ibuf = IMB_allocImBuf(x, y, ibuf_depth, IB_rect);
rect = (unsigned char *) ibuf->rect;
if (depth <= 8) {
const int rowsize = (depth * x + 31) / 32 * 4;
const char (*palette)[4] = (void *)(mem + skip);
const int startmask = ((1 << depth) - 1) << 8;
for (i = y; i > 0; i--) {
int index;
int bitoffs = 8;
int bitmask = startmask;
int nbytes = 0;
const char *pcol;
if (top_to_bottom) {
rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
}
for (j = x; j > 0; j--) {
bitoffs -= depth;
bitmask >>= depth;
index = (bmp[0] & bitmask) >> bitoffs;
pcol = palette[index];
/* intentionally BGR -> RGB */
rect[0] = pcol[2];
rect[1] = pcol[1];
rect[2] = pcol[0];
rect[3] = 255;
rect += 4;
if (bitoffs == 0) {
/* Advance to the next byte */
bitoffs = 8;
bitmask = startmask;
nbytes += 1;
bmp += 1;
}
}
/* Advance to the next row */
bmp += (rowsize - nbytes);
}
}
else if (depth == 16) {
for (i = y; i > 0; i--) {
if (top_to_bottom) {
rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
}
for (j = x; j > 0; j--) {
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) {
const int x_pad = x % 4;
for (i = y; i > 0; i--) {
if (top_to_bottom) {
rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
}
for (j = x; j > 0; j--) {
rect[0] = bmp[2];
rect[1] = bmp[1];
rect[2] = bmp[0];
rect[3] = 255;
rect += 4; bmp += 3;
}
/* for 24-bit images, rows are padded to multiples of 4 */
bmp += x_pad;
}
}
else if (depth == 32) {
for (i = y; i > 0; i--) {
if (top_to_bottom) {
rect = (unsigned char *) &ibuf->rect[(i - 1) * x];
}
for (j = x; j > 0; j--) {
rect[0] = bmp[2];
rect[1] = bmp[1];
rect[2] = bmp[0];
rect[3] = bmp[3];
rect += 4; bmp += 4;
}
}
}
}
if (ibuf) {
ibuf->ppm[0] = xppm;
ibuf->ppm[1] = yppm;
ibuf->ftype = BMP;
}
return(ibuf);
}
#undef CHECK_HEADER_FIELD_BMP
#undef CHECK_HEADER_FIELD
/* Couple of helper functions for writing our data */
static int putIntLSB(unsigned int ui, FILE *ofile)
{
putc((ui >> 0) & 0xFF, ofile);
putc((ui >> 8) & 0xFF, ofile);
putc((ui >> 16) & 0xFF, ofile);
return putc((ui >> 24) & 0xFF, ofile);
}
static int putShortLSB(unsigned short us, FILE *ofile)
{
putc((us >> 0) & 0xFF, ofile);
return putc((us >> 8) & 0xFF, ofile);
}
/* Found write info at http://users.ece.gatech.edu/~slabaugh/personal/c/bitmapUnix.c */
int imb_savebmp(struct ImBuf *ibuf, const char *name, int flags)
{
BMPINFOHEADER infoheader;
int bytesize, extrabytes, x, y, t, ptr;
uchar *data;
FILE *ofile;
(void)flags; /* unused */
extrabytes = (4 - ibuf->x * 3 % 4) % 4;
bytesize = (ibuf->x * 3 + extrabytes) * ibuf->y;
data = (uchar *) ibuf->rect;
ofile = BLI_fopen(name, "wb");
if (!ofile) return 0;
putShortLSB(19778, ofile); /* "BM" */
putIntLSB(bytesize + BMP_FILEHEADER_SIZE + sizeof(infoheader), ofile); /* Total file size */
putShortLSB(0, ofile); /* Res1 */
putShortLSB(0, ofile); /* Res2 */
putIntLSB(BMP_FILEHEADER_SIZE + sizeof(infoheader), ofile);
putIntLSB(sizeof(infoheader), ofile);
putIntLSB(ibuf->x, ofile);
putIntLSB(ibuf->y, ofile);
putShortLSB(1, ofile);
putShortLSB(24, ofile);
putIntLSB(0, ofile);
putIntLSB(bytesize, ofile);
putIntLSB((int)(ibuf->ppm[0] + 0.5), ofile);
putIntLSB((int)(ibuf->ppm[1] + 0.5), ofile);
putIntLSB(0, ofile);
putIntLSB(0, ofile);
/* Need to write out padded image data in bgr format */
for (y = 0; y < ibuf->y; y++) {
for (x = 0; x < ibuf->x; x++) {
ptr = (x + y * ibuf->x) * 4;
if (putc(data[ptr + 2], ofile) == EOF) return 0;
if (putc(data[ptr + 1], ofile) == EOF) return 0;
if (putc(data[ptr], ofile) == EOF) return 0;
}
/* add padding here */
for (t = 0; t < extrabytes; t++) {
if (putc(0, ofile) == EOF) return 0;
}
}
if (ofile) {
fflush(ofile);
fclose(ofile);
}
return 1;
}
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