ref: e447c9fb929e61a40203b0193ee8d4cab8d72f7e
dir: /DoConfig/fltk/src/fl_draw_image.cxx/
//
// "$Id$"
//
// Image drawing routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// I hope a simple and portable method of drawing color and monochrome
// images. To keep this simple, only a single storage type is
// supported: 8 bit unsigned data, byte order RGB, and pixels are
// stored packed into rows with the origin at the top-left. It is
// possible to alter the size of pixels with the "delta" argument, to
// add alpha or other information per pixel. It is also possible to
// change the origin and direction of the image data by messing with
// the "delta" and "linedelta", making them negative, though this may
// defeat some of the shortcuts in translating the image for X.
#ifdef WIN32
# include "fl_draw_image_win32.cxx"
#elif defined(__APPLE__)
# include "fl_draw_image_mac.cxx"
#else
// A list of assumptions made about the X display:
// bits_per_pixel must be one of 8, 16, 24, 32.
// scanline_pad must be a power of 2 and greater or equal to 8.
// PsuedoColor visuals must have 8 bits_per_pixel (although the depth
// may be less than 8). This is the only limitation that affects any
// modern X displays, you can't use 12 or 16 bit colormaps.
// The mask bits in TrueColor visuals for each color are
// contiguous and have at least one bit of each color. This
// is not checked for.
// For 24 and 32 bit visuals there must be at least 8 bits of each color.
////////////////////////////////////////////////////////////////
# include <FL/Fl.H>
# include <FL/fl_draw.H>
# include <FL/x.H>
# include "Fl_XColor.H"
# include "flstring.h"
static XImage xi; // template used to pass info to X
static int bytes_per_pixel;
static int scanline_add;
static int scanline_mask;
static void (*converter)(const uchar *from, uchar *to, int w, int delta);
static void (*mono_converter)(const uchar *from, uchar *to, int w, int delta);
static int dir; // direction-alternator
static int ri,gi,bi; // saved error-diffusion value
# if USE_COLORMAP
////////////////////////////////////////////////////////////////
// 8-bit converter with error diffusion
static void color8_converter(const uchar *from, uchar *to, int w, int delta) {
int r=ri, g=gi, b=bi;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
to = to+(w-1);
d = -delta;
td = -1;
} else {
dir = 1;
d = delta;
td = 1;
}
for (; w--; from += d, to += td) {
r += from[0]; if (r < 0) r = 0; else if (r>255) r = 255;
g += from[1]; if (g < 0) g = 0; else if (g>255) g = 255;
b += from[2]; if (b < 0) b = 0; else if (b>255) b = 255;
Fl_Color i = fl_color_cube(r*FL_NUM_RED/256,g*FL_NUM_GREEN/256,b*FL_NUM_BLUE/256);
Fl_XColor& xmap = fl_xmap[0][i];
if (!xmap.mapped) {if (!fl_redmask) fl_xpixel(r,g,b); else fl_xpixel(i);}
r -= xmap.r;
g -= xmap.g;
b -= xmap.b;
*to = uchar(xmap.pixel);
}
ri = r; gi = g; bi = b;
}
static void mono8_converter(const uchar *from, uchar *to, int w, int delta) {
int r=ri, g=gi, b=bi;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
to = to+(w-1);
d = -delta;
td = -1;
} else {
dir = 1;
d = delta;
td = 1;
}
for (; w--; from += d, to += td) {
r += from[0]; if (r < 0) r = 0; else if (r>255) r = 255;
g += from[0]; if (g < 0) g = 0; else if (g>255) g = 255;
b += from[0]; if (b < 0) b = 0; else if (b>255) b = 255;
Fl_Color i = fl_color_cube(r*FL_NUM_RED/256,g*FL_NUM_GREEN/256,b*FL_NUM_BLUE/256);
Fl_XColor& xmap = fl_xmap[0][i];
if (!xmap.mapped) {if (!fl_redmask) fl_xpixel(r,g,b); else fl_xpixel(i);}
r -= xmap.r;
g -= xmap.g;
b -= xmap.b;
*to = uchar(xmap.pixel);
}
ri = r; gi = g; bi = b;
}
# endif
////////////////////////////////////////////////////////////////
// 16 bit TrueColor converters with error diffusion
// Cray computers have no 16-bit type, so we use character pointers
// (which may be slow)
# ifdef U16
# define OUTTYPE U16
# define OUTSIZE 1
# define OUTASSIGN(v) *t = v
# else
# define OUTTYPE uchar
# define OUTSIZE 2
# define OUTASSIGN(v) int tt=v; t[0] = uchar(tt>>8); t[1] = uchar(tt)
# endif
static void color16_converter(const uchar *from, uchar *to, int w, int delta) {
OUTTYPE *t = (OUTTYPE *)to;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
t = t+(w-1)*OUTSIZE;
d = -delta;
td = -OUTSIZE;
} else {
dir = 1;
d = delta;
td = OUTSIZE;
}
int r=ri, g=gi, b=bi;
for (; w--; from += d, t += td) {
r = (r&~fl_redmask) +from[0]; if (r>255) r = 255;
g = (g&~fl_greenmask)+from[1]; if (g>255) g = 255;
b = (b&~fl_bluemask) +from[2]; if (b>255) b = 255;
OUTASSIGN((
((r&fl_redmask)<<fl_redshift)+
((g&fl_greenmask)<<fl_greenshift)+
((b&fl_bluemask)<<fl_blueshift)
) >> fl_extrashift);
}
ri = r; gi = g; bi = b;
}
static void mono16_converter(const uchar *from,uchar *to,int w, int delta) {
OUTTYPE *t = (OUTTYPE *)to;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
t = t+(w-1)*OUTSIZE;
d = -delta;
td = -OUTSIZE;
} else {
dir = 1;
d = delta;
td = OUTSIZE;
}
uchar mask = fl_redmask & fl_greenmask & fl_bluemask;
int r=ri;
for (; w--; from += d, t += td) {
r = (r&~mask) + *from; if (r > 255) r = 255;
uchar m = r&mask;
OUTASSIGN((
(m<<fl_redshift)+
(m<<fl_greenshift)+
(m<<fl_blueshift)
) >> fl_extrashift);
}
ri = r;
}
// special-case the 5r6g5b layout used by XFree86:
static void c565_converter(const uchar *from, uchar *to, int w, int delta) {
OUTTYPE *t = (OUTTYPE *)to;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
t = t+(w-1)*OUTSIZE;
d = -delta;
td = -OUTSIZE;
} else {
dir = 1;
d = delta;
td = OUTSIZE;
}
int r=ri, g=gi, b=bi;
for (; w--; from += d, t += td) {
r = (r&7)+from[0]; if (r>255) r = 255;
g = (g&3)+from[1]; if (g>255) g = 255;
b = (b&7)+from[2]; if (b>255) b = 255;
OUTASSIGN(((r&0xf8)<<8) + ((g&0xfc)<<3) + (b>>3));
}
ri = r; gi = g; bi = b;
}
static void m565_converter(const uchar *from,uchar *to,int w, int delta) {
OUTTYPE *t = (OUTTYPE *)to;
int d, td;
if (dir) {
dir = 0;
from = from+(w-1)*delta;
t = t+(w-1)*OUTSIZE;
d = -delta;
td = -OUTSIZE;
} else {
dir = 1;
d = delta;
td = OUTSIZE;
}
int r=ri;
for (; w--; from += d, t += td) {
r = (r&7) + *from; if (r > 255) r = 255;
OUTASSIGN((r>>3) * 0x841);
}
ri = r;
}
////////////////////////////////////////////////////////////////
// 24bit TrueColor converters:
static void rgb_converter(const uchar *from, uchar *to, int w, int delta) {
int d = delta-3;
for (; w--; from += d) {
*to++ = *from++;
*to++ = *from++;
*to++ = *from++;
}
}
static void bgr_converter(const uchar *from, uchar *to, int w, int delta) {
for (; w--; from += delta) {
uchar r = from[0];
uchar g = from[1];
*to++ = from[2];
*to++ = g;
*to++ = r;
}
}
static void rrr_converter(const uchar *from, uchar *to, int w, int delta) {
for (; w--; from += delta) {
*to++ = *from;
*to++ = *from;
*to++ = *from;
}
}
////////////////////////////////////////////////////////////////
// 32bit TrueColor converters on a 32 or 64-bit machine:
# ifdef U64
# define STORETYPE U64
# if WORDS_BIGENDIAN
# define INNARDS32(f) \
U64 *t = (U64*)to; \
int w1 = w/2; \
for (; w1--; from += delta) {U64 i = f; from += delta; *t++ = (i<<32)|(f);} \
if (w&1) *t++ = (U64)(f)<<32;
# else
# define INNARDS32(f) \
U64 *t = (U64*)to; \
int w1 = w/2; \
for (; w1--; from += delta) {U64 i = f; from += delta; *t++ = ((U64)(f)<<32)|i;} \
if (w&1) *t++ = (U64)(f);
# endif
# else
# define STORETYPE U32
# define INNARDS32(f) \
U32 *t = (U32*)to; for (; w--; from += delta) *t++ = f
# endif
static void rgbx_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32((unsigned(from[0])<<24)+(from[1]<<16)+(from[2]<<8));
}
static void xbgr_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32((from[0])+(from[1]<<8)+(from[2]<<16));
}
static void xrgb_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32((from[0]<<16)+(from[1]<<8)+(from[2]));
}
static void argb_premul_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32((unsigned(from[3]) << 24) +
(((from[0] * from[3]) / 255) << 16) +
(((from[1] * from[3]) / 255) << 8) +
((from[2] * from[3]) / 255));
}
static void bgrx_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32((from[0]<<8)+(from[1]<<16)+(unsigned(from[2])<<24));
}
static void rrrx_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32(unsigned(*from) * 0x1010100U);
}
static void xrrr_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32(*from * 0x10101U);
}
static void
color32_converter(const uchar *from, uchar *to, int w, int delta) {
INNARDS32(
(from[0]<<fl_redshift)+(from[1]<<fl_greenshift)+(from[2]<<fl_blueshift));
}
static void
mono32_converter(const uchar *from,uchar *to,int w, int delta) {
INNARDS32(
(*from << fl_redshift)+(*from << fl_greenshift)+(*from << fl_blueshift));
}
////////////////////////////////////////////////////////////////
static void figure_out_visual() {
fl_xpixel(FL_BLACK); // setup fl_redmask, etc, in fl_color.cxx
fl_xpixel(FL_WHITE); // also make sure white is allocated
static XPixmapFormatValues *pfvlist;
static int FL_NUM_pfv;
if (!pfvlist) pfvlist = XListPixmapFormats(fl_display,&FL_NUM_pfv);
XPixmapFormatValues *pfv;
for (pfv = pfvlist; pfv < pfvlist+FL_NUM_pfv; pfv++)
if (pfv->depth == fl_visual->depth) break;
xi.format = ZPixmap;
xi.byte_order = ImageByteOrder(fl_display);
//i.bitmap_unit = 8;
//i.bitmap_bit_order = MSBFirst;
//i.bitmap_pad = 8;
xi.depth = fl_visual->depth;
xi.bits_per_pixel = pfv->bits_per_pixel;
if (xi.bits_per_pixel & 7) bytes_per_pixel = 0; // produce fatal error
else bytes_per_pixel = xi.bits_per_pixel/8;
unsigned int n = pfv->scanline_pad/8;
if (pfv->scanline_pad & 7 || (n&(n-1)))
Fl::fatal("Can't do scanline_pad of %d",pfv->scanline_pad);
if (n < sizeof(STORETYPE)) n = sizeof(STORETYPE);
scanline_add = n-1;
scanline_mask = -n;
# if USE_COLORMAP
if (bytes_per_pixel == 1) {
converter = color8_converter;
mono_converter = mono8_converter;
return;
}
if (!fl_visual->red_mask)
Fl::fatal("Can't do %d bits_per_pixel colormap",xi.bits_per_pixel);
# endif
// otherwise it is a TrueColor visual:
int rs = fl_redshift;
int gs = fl_greenshift;
int bs = fl_blueshift;
switch (bytes_per_pixel) {
case 2:
// All 16-bit TrueColor visuals are supported on any machine with
// 24 or more bits per integer.
# ifdef U16
xi.byte_order = WORDS_BIGENDIAN;
# else
xi.byte_order = 1;
# endif
if (rs == 11 && gs == 6 && bs == 0 && fl_extrashift == 3) {
converter = c565_converter;
mono_converter = m565_converter;
} else {
converter = color16_converter;
mono_converter = mono16_converter;
}
break;
case 3:
if (xi.byte_order) {rs = 16-rs; gs = 16-gs; bs = 16-bs;}
if (rs == 0 && gs == 8 && bs == 16) {
converter = rgb_converter;
mono_converter = rrr_converter;
} else if (rs == 16 && gs == 8 && bs == 0) {
converter = bgr_converter;
mono_converter = rrr_converter;
} else {
Fl::fatal("Can't do arbitrary 24bit color");
}
break;
case 4:
if ((xi.byte_order!=0) != WORDS_BIGENDIAN)
{rs = 24-rs; gs = 24-gs; bs = 24-bs;}
if (rs == 0 && gs == 8 && bs == 16) {
converter = xbgr_converter;
mono_converter = xrrr_converter;
} else if (rs == 24 && gs == 16 && bs == 8) {
converter = rgbx_converter;
mono_converter = rrrx_converter;
} else if (rs == 8 && gs == 16 && bs == 24) {
converter = bgrx_converter;
mono_converter = rrrx_converter;
} else if (rs == 16 && gs == 8 && bs == 0) {
converter = xrgb_converter;
mono_converter = xrrr_converter;
} else {
xi.byte_order = WORDS_BIGENDIAN;
converter = color32_converter;
mono_converter = mono32_converter;
}
break;
default:
Fl::fatal("Can't do %d bits_per_pixel",xi.bits_per_pixel);
}
}
# define MAXBUFFER 0x40000 // 256k
static void innards(const uchar *buf, int X, int Y, int W, int H,
int delta, int linedelta, int mono,
Fl_Draw_Image_Cb cb, void* userdata,
const bool alpha)
{
if (!linedelta) linedelta = W*abs(delta);
int dx, dy, w, h;
fl_clip_box(X,Y,W,H,dx,dy,w,h);
if (w<=0 || h<=0) return;
dx -= X;
dy -= Y;
if (!bytes_per_pixel) figure_out_visual();
const unsigned oldbpp = bytes_per_pixel;
const GC oldgc = fl_gc;
static GC gc32 = None;
xi.width = w;
xi.height = h;
void (*conv)(const uchar *from, uchar *to, int w, int delta) = converter;
if (mono) conv = mono_converter;
if (alpha) {
// This flag states the destination format is ARGB32 (big-endian), pre-multiplied.
bytes_per_pixel = 4;
conv = argb_premul_converter;
xi.depth = 32;
xi.bits_per_pixel = 32;
// Do we need a new GC?
if (fl_visual->depth != 32) {
if (gc32 == None)
gc32 = XCreateGC(fl_display, fl_window, 0, NULL);
fl_gc = gc32;
}
}
// See if the data is already in the right format. Unfortunately
// some 32-bit x servers (XFree86) care about the unknown 8 bits
// and they must be zero. I can't confirm this for user-supplied
// data, so the 32-bit shortcut is disabled...
// This can set bytes_per_line negative if image is bottom-to-top
// I tested it on Linux, but it may fail on other Xlib implementations:
if (buf && (
# if 0 // set this to 1 to allow 32-bit shortcut
delta == 4 &&
# if WORDS_BIGENDIAN
conv == rgbx_converter
# else
conv == xbgr_converter
# endif
||
# endif
conv == rgb_converter && delta==3
) && !(linedelta&scanline_add)) {
xi.data = (char *)(buf+delta*dx+linedelta*dy);
xi.bytes_per_line = linedelta;
} else {
int linesize = ((w*bytes_per_pixel+scanline_add)&scanline_mask)/sizeof(STORETYPE);
int blocking = h;
static STORETYPE *buffer; // our storage, always word aligned
static long buffer_size;
{int size = linesize*h;
if (size > MAXBUFFER) {
size = MAXBUFFER;
blocking = MAXBUFFER/linesize;
}
if (size > buffer_size) {
delete[] buffer;
buffer_size = size;
buffer = new STORETYPE[size];
}}
xi.data = (char *)buffer;
xi.bytes_per_line = linesize*sizeof(STORETYPE);
if (buf) {
buf += delta*dx+linedelta*dy;
for (int j=0; j<h; ) {
STORETYPE *to = buffer;
int k;
for (k = 0; j<h && k<blocking; k++, j++) {
conv(buf, (uchar*)to, w, delta);
buf += linedelta;
to += linesize;
}
XPutImage(fl_display,fl_window,fl_gc, &xi, 0, 0, X+dx, Y+dy+j-k, w, k);
}
} else {
STORETYPE* linebuf = new STORETYPE[(W*delta+(sizeof(STORETYPE)-1))/sizeof(STORETYPE)];
for (int j=0; j<h; ) {
STORETYPE *to = buffer;
int k;
for (k = 0; j<h && k<blocking; k++, j++) {
cb(userdata, dx, dy+j, w, (uchar*)linebuf);
conv((uchar*)linebuf, (uchar*)to, w, delta);
to += linesize;
}
XPutImage(fl_display,fl_window,fl_gc, &xi, 0, 0, X+dx, Y+dy+j-k, w, k);
}
delete[] linebuf;
}
}
if (alpha) {
bytes_per_pixel = oldbpp;
xi.depth = fl_visual->depth;
xi.bits_per_pixel = oldbpp * 8;
if (fl_visual->depth != 32) {
fl_gc = oldgc;
}
}
}
void Fl_Xlib_Graphics_Driver::draw_image(const uchar* buf, int x, int y, int w, int h, int d, int l){
const bool alpha = !!(abs(d) & FL_IMAGE_WITH_ALPHA);
if (alpha) d ^= FL_IMAGE_WITH_ALPHA;
const int mono = (d>-3 && d<3);
innards(buf,x,y,w,h,d,l,mono,0,0,alpha);
}
void Fl_Xlib_Graphics_Driver::draw_image(Fl_Draw_Image_Cb cb, void* data,
int x, int y, int w, int h,int d) {
const bool alpha = !!(abs(d) & FL_IMAGE_WITH_ALPHA);
if (alpha) d ^= FL_IMAGE_WITH_ALPHA;
const int mono = (d>-3 && d<3);
innards(0,x,y,w,h,d,0,mono,cb,data,alpha);
}
void Fl_Xlib_Graphics_Driver::draw_image_mono(const uchar* buf, int x, int y, int w, int h, int d, int l){
innards(buf,x,y,w,h,d,l,1,0,0,0);
}
void Fl_Xlib_Graphics_Driver::draw_image_mono(Fl_Draw_Image_Cb cb, void* data,
int x, int y, int w, int h,int d) {
innards(0,x,y,w,h,d,0,1,cb,data,0);
}
void fl_rectf(int x, int y, int w, int h, uchar r, uchar g, uchar b) {
if (fl_visual->depth > 16) {
fl_color(r,g,b);
fl_rectf(x,y,w,h);
} else {
uchar c[3];
c[0] = r; c[1] = g; c[2] = b;
innards(c,x,y,w,h,0,0,0,0,0,0);
}
}
#endif
//
// End of "$Id$".
//