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/*
* radiance_hdr.c
*
* $Id:
*
* ***** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
/* ----------------------------------------------------------------------
Radiance High Dynamic Range image file IO
For description and code for reading/writing of radiance hdr files
by Greg Ward, refer to:
http://radsite.lbl.gov/radiance/refer/Notes/picture_format.html
----------------------------------------------------------------------
*/
#ifdef WIN32
#include <io.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_radiance_hdr.h"
/* needed constants */
#define MINELEN 8
#define MAXELEN 0x7fff
#define MINRUN 4 /* minimum run length */
#define RED 0
#define GRN 1
#define BLU 2
#define EXP 3
#define COLXS 128
#define STR_MAX 540
typedef unsigned char RGBE[4];
typedef float fCOLOR[3];
/* copy source -> dest */
#define copy_rgbe(c1, c2) (c2[RED]=c1[RED], c2[GRN]=c1[GRN], c2[BLU]=c1[BLU], c2[EXP]=c1[EXP])
#define copy_fcol(f1, f2) (f2[RED]=f1[RED], f2[GRN]=f1[GRN], f2[BLU]=f1[BLU])
/* read routines */
static unsigned char* oldreadcolrs(RGBE *scan, unsigned char *mem, int xmax)
{
int i, rshift = 0, len = xmax;
while (len > 0) {
scan[0][RED] = *mem++;
scan[0][GRN] = *mem++;
scan[0][BLU] = *mem++;
scan[0][EXP] = *mem++;
if (scan[0][RED] == 1 && scan[0][GRN] == 1 && scan[0][BLU] == 1) {
for (i=scan[0][EXP]<<rshift;i>0;i--) {
copy_rgbe(scan[-1], scan[0]);
scan++;
len--;
}
rshift += 8;
}
else {
scan++;
len--;
rshift = 0;
}
}
return mem;
}
static unsigned char* freadcolrs(RGBE *scan, unsigned char* mem, int xmax)
{
int i, j, code, val;
if ((xmax < MINELEN) | (xmax > MAXELEN)) return oldreadcolrs(scan, mem, xmax);
i = *mem++;
if (i != 2) return oldreadcolrs(scan, mem-1, xmax);
scan[0][GRN] = *mem++;
scan[0][BLU] = *mem++;
i = *mem++;
if (((scan[0][BLU] << 8) | i) != xmax) return NULL;
for (i=0;i<4;i++)
for (j=0;j<xmax;) {
code = *mem++;
if (code > 128) {
code &= 127;
val = *mem++;
while (code--)
scan[j++][i] = (unsigned char)val;
}
else
while (code--)
scan[j++][i] = *mem++;
}
return mem;
}
/* helper functions */
/* rgbe -> float color */
static void RGBE2FLOAT(RGBE rgbe, fCOLOR fcol)
{
if (rgbe[EXP]==0) {
fcol[RED] = fcol[GRN] = fcol[BLU] = 0;
}
else {
float f = ldexp(1.0, rgbe[EXP]-(COLXS+8));
fcol[RED] = f*(rgbe[RED] + 0.5f);
fcol[GRN] = f*(rgbe[GRN] + 0.5f);
fcol[BLU] = f*(rgbe[BLU] + 0.5f);
}
}
/* float color -> rgbe */
static void FLOAT2RGBE(fCOLOR fcol, RGBE rgbe)
{
int e;
float d = (fcol[RED]>fcol[GRN]) ? fcol[RED] : fcol[GRN];
if (fcol[BLU]>d) d = fcol[BLU];
if (d <= 1e-32f)
rgbe[RED] = rgbe[GRN] = rgbe[BLU] = rgbe[EXP] = 0;
else {
d = frexp(d, &e) * 256.f / d;
rgbe[RED] = (unsigned char)(fcol[RED] * d);
rgbe[GRN] = (unsigned char)(fcol[GRN] * d);
rgbe[BLU] = (unsigned char)(fcol[BLU] * d);
rgbe[EXP] = (unsigned char)(e + COLXS);
}
}
/* ImBuf read */
int imb_is_a_hdr(void *buf)
{
// For recognition, Blender only loads first 32 bytes, so use #?RADIANCE id instead
// update: actually, the 'RADIANCE' part is just an optional program name, the magic word is really only the '#?' part
//if (strstr((char*)buf, "#?RADIANCE")) return 1;
if (strstr((char*)buf, "#?")) return 1;
// if (strstr((char*)buf, "32-bit_rle_rgbe")) return 1;
return 0;
}
struct ImBuf *imb_loadhdr(unsigned char *mem, int size, int flags)
{
struct ImBuf* ibuf;
RGBE* sline;
fCOLOR fcol;
float* rect_float;
int found=0;
int width=0, height=0;
int x, y;
unsigned char* ptr;
unsigned char* rect;
char oriY[80], oriX[80];
if (imb_is_a_hdr((void*)mem))
{
/* find empty line, next line is resolution info */
for (x=1;x<size;x++) {
if ((mem[x-1]=='\n') && (mem[x]=='\n')) {
found = 1;
break;
}
}
if (found) {
if (sscanf((char *)&mem[x+1], "%80s %d %80s %d", (char*)&oriY, &height,
(char*)&oriX, &width) != 4) return NULL;
/* find end of this line, data right behind it */
ptr = (unsigned char *)strchr((char*)&mem[x+1], '\n');
ptr++;
if (flags & IB_test) ibuf = IMB_allocImBuf(width, height, 32, 0, 0);
else ibuf = IMB_allocImBuf(width, height, 32, IB_rect|IB_rectfloat, 0);
if (ibuf==NULL) return NULL;
ibuf->ftype = RADHDR;
ibuf->xorig = ibuf->yorig = 0;
if (flags & IB_test) return ibuf;
/* read in and decode the actual data */
sline = (RGBE*)MEM_mallocN(sizeof(RGBE)*width, "radhdr_read_tmpscan");
rect = (unsigned char*)ibuf->rect;
rect_float = (float *)ibuf->rect_float;
for (y=0;y<height;y++) {
ptr = freadcolrs(sline, ptr, width);
if (ptr==NULL) {
printf("HDR decode error\n");
MEM_freeN(sline);
return ibuf;
}
for (x=0;x<width;x++) {
/* convert to ldr */
RGBE2FLOAT(sline[x], fcol);
*rect_float++ = fcol[RED];
*rect_float++ = fcol[GRN];
*rect_float++ = fcol[BLU];
*rect_float++ = 1.0f;
/* Also old oldstyle for the rest of blender which is not using floats yet */
// e: changed to simpler tonemapping, previous code was rather slow (is this actually still relevant at all?)
fcol[RED] = fcol[RED]/(1.f + fcol[RED]);
fcol[GRN] = fcol[GRN]/(1.f + fcol[GRN]);
fcol[BLU] = fcol[BLU]/(1.f + fcol[BLU]);
*rect++ = (unsigned char)((fcol[RED] < 0.f) ? 0 : ((fcol[RED] > 1.f) ? 255 : (255.f*fcol[RED])));
*rect++ = (unsigned char)((fcol[GRN] < 0.f) ? 0 : ((fcol[GRN] > 1.f) ? 255 : (255.f*fcol[GRN])));
*rect++ = (unsigned char)((fcol[BLU] < 0.f) ? 0 : ((fcol[BLU] > 1.f) ? 255 : (255.f*fcol[BLU])));
*rect++ = 255;
}
}
MEM_freeN(sline);
if (oriY[0]=='-') IMB_flipy(ibuf);
return ibuf;
}
//else printf("Data not found!\n");
}
//else printf("Not a valid radiance HDR file!\n");
return NULL;
}
/* ImBuf write */
static int fwritecolrs(FILE* file, int width, unsigned char* ibufscan, float* fpscan)
{
int x, i, j, beg, c2, cnt=0;
fCOLOR fcol;
RGBE rgbe, *rgbe_scan;
if ((ibufscan==NULL) && (fpscan==NULL)) return 0;
rgbe_scan = (RGBE*)MEM_mallocN(sizeof(RGBE)*width, "radhdr_write_tmpscan");
/* convert scanline */
j= 0;
for (i=0;i<width;i++) {
if (fpscan) {
fcol[RED] = fpscan[j];
fcol[GRN] = fpscan[j+1];
fcol[BLU] = fpscan[j+2];
} else {
fcol[RED] = (float)ibufscan[j] / 255.f;
fcol[GRN] = (float)ibufscan[j+1] / 255.f;
fcol[BLU] = (float)ibufscan[j+2] /255.f;
}
FLOAT2RGBE(fcol, rgbe);
copy_rgbe(rgbe, rgbe_scan[i]);
j+=4;
}
if ((width < MINELEN) | (width > MAXELEN)) { /* OOBs, write out flat */
x=fwrite((char *)rgbe_scan, sizeof(RGBE), width, file) - width;
MEM_freeN(rgbe_scan);
return x;
}
/* put magic header */
putc(2, file);
putc(2, file);
putc((unsigned char)(width >> 8), file);
putc((unsigned char)(width & 255), file);
/* put components seperately */
for (i=0;i<4;i++) {
for (j=0;j<width;j+=cnt) { /* find next run */
for (beg=j;beg<width;beg+=cnt) {
for (cnt=1;(cnt<127) && ((beg+cnt)<width) && (rgbe_scan[beg+cnt][i] == rgbe_scan[beg][i]); cnt++);
if (cnt>=MINRUN) break; /* long enough */
}
if (((beg-j)>1) && ((beg-j) < MINRUN)) {
c2 = j+1;
while (rgbe_scan[c2++][i] == rgbe_scan[j][i])
if (c2 == beg) { /* short run */
putc((unsigned char)(128+beg-j), file);
putc((unsigned char)(rgbe_scan[j][i]), file);
j = beg;
break;
}
}
while (j < beg) { /* write out non-run */
if ((c2 = beg-j) > 128) c2 = 128;
putc((unsigned char)(c2), file);
while (c2--) putc(rgbe_scan[j++][i], file);
}
if (cnt >= MINRUN) { /* write out run */
putc((unsigned char)(128+cnt), file);
putc(rgbe_scan[beg][i], file);
}
else cnt = 0;
}
}
MEM_freeN(rgbe_scan);
return(ferror(file) ? -1 : 0);
}
static void writeHeader(FILE *file, int width, int height)
{
fprintf(file, "#?RADIANCE");
fputc(10, file);
fprintf(file, "# %s", "Created with Blender");
fputc(10, file);
fprintf(file, "EXPOSURE=%25.13f", 1.0);
fputc(10, file);
fprintf(file, "FORMAT=32-bit_rle_rgbe");
fputc(10, file);
fputc(10, file);
fprintf(file, "-Y %d +X %d", height, width);
fputc(10, file);
}
short imb_savehdr(struct ImBuf *ibuf, char *name, int flags)
{
FILE* file = fopen(name, "wb");
float *fp= NULL;
int y, width=ibuf->x, height=ibuf->y;
unsigned char *cp= NULL;
if (file==NULL) return 0;
writeHeader(file, width, height);
if(ibuf->rect)
cp= (unsigned char *)(ibuf->rect + (height-1)*width);
if(ibuf->rect_float)
fp= ibuf->rect_float + 4*(height-1)*width;
for (y=height-1;y>=0;y--) {
if (fwritecolrs(file, width, cp, fp) < 0) {
fclose(file);
printf("HDR write error\n");
return 0;
}
if(cp) cp-= 4*width;
if(fp) fp-= 4*width;
}
fclose(file);
return 1;
}
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