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+// fl_draw_image.C
+
+// 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.C"
+#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"
+
+static XImage i; // 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
+
+// I make a 16x16x16 cube of the closest colors in the fltk colormap
+// we could allocate to each of the colors in a 4-bit image. This is
+// then used to find the pixel values and actual colors for error diffusion.
+static uchar cube[16*16*16];
+
+// calculate sum-of-squares error between 4-bit index and pixel colors:
+static int calc_error(int r, int g, int b, int i) {
+ int t; int s;
+ t = ((r<<4)+8)-fl_xmap[0][i].r; s = t*t;
+ t = ((g<<4)+8)-fl_xmap[0][i].g; s += t*t;
+ t = ((b<<4)+8)-fl_xmap[0][i].b; s += t*t;
+ return s;
+}
+
+// replace the color stored at a location with a better one:
+static void improve(uchar *p, int& e, int r, int g, int b, int i) {
+ if (i < FL_GRAY_RAMP || i > 255) return;
+ int e1 = calc_error(r,g,b,i);
+ if (e1 < e) {*p = i; e = e1;}
+}
+
+static int filled_color_cube;
+static void fill_color_cube() {
+ filled_color_cube = 1;
+ int i;
+ // allocate all the colors in the fltk color cube and gray ramp:
+ // allocate widely seperated values first so that the bad ones are
+ // distributed evenly through the colormap:
+ for (i=0;;) {
+ fl_xpixel((Fl_Color)(i+FL_COLOR_CUBE));
+ i = (i+109)%(FL_NUM_RED*FL_NUM_GREEN*FL_NUM_BLUE); if (!i) break;
+ }
+ for (i=0;;) {
+ fl_xpixel((Fl_Color)(i+FL_GRAY_RAMP));
+ i = (i+7)%FL_NUM_GRAY; if (!i) break;
+ }
+ // fill in the 16x16x16 cube:
+ uchar *p = cube;
+ for (int r = 0; r<16; r++) {
+ for (int g = 0; g<16; g++) {
+ for (int b = 0; b<16; b++, p++) {
+ // initial try is value from color cube:
+ Fl_Color i = fl_color_cube(r*FL_NUM_RED/16, g*FL_NUM_GREEN/16,
+ b*FL_NUM_BLUE/16);
+ int e = calc_error(r,g,b,i);
+ *p = uchar(i);
+ // try neighbor pixels in the cube to see if they are better:
+ improve(p,e,r,g,b,i+FL_NUM_RED*FL_NUM_GREEN);
+ improve(p,e,r,g,b,i-FL_NUM_RED*FL_NUM_GREEN);
+ improve(p,e,r,g,b,i+FL_NUM_GREEN);
+ improve(p,e,r,g,b,i-FL_NUM_GREEN);
+ improve(p,e,r,g,b,i+1);
+ improve(p,e,r,g,b,i-1);
+ // try the gray ramp:
+ i = fl_gray_ramp(g*FL_NUM_GRAY/15);
+ improve(p,e,r,g,b,i);
+ improve(p,e,r,g,b,i+1);
+ improve(p,e,r,g,b,i-1);
+ }
+ }
+ }
+}
+
+static void color8_converter(const uchar *from, uchar *to, int w, int delta) {
+ if (!filled_color_cube) fill_color_cube();
+ 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_XColor* x = fl_xmap[0] + cube[((r<<4)&0xf00)+(g&0xf0)+(b>>4)];
+ r -= x->r;
+ g -= x->g;
+ b -= x->b;
+ *to = uchar(x->pixel);
+ }
+ ri = r; gi = g; bi = b;
+}
+
+static void mono8_converter(const uchar *from, uchar *to, int w, int delta) {
+ if (!filled_color_cube) fill_color_cube();
+ int r=ri;
+ 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;
+ Fl_XColor* x = fl_xmap[0] + cube[(r>>4)*0x111];
+ r -= x->g;
+ *to = uchar(x->pixel);
+ }
+ ri = r;
+}
+
+#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+1)/2; \
+ for (; w1--; from += delta) {U64 i = f; from += delta; *t++ = (i<<32)|(f);}
+#else
+#define INNARDS32(f) \
+ U64 *t = (U64*)to; \
+ int w1 = (w+1)/2; \
+ for (; w1--; from += delta) {U64 i=f; from+= delta; *t++ = ((U64)(f)<<32)|i;}
+#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 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() {
+
+ 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;
+ i.format = ZPixmap;
+ i.byte_order = ImageByteOrder(fl_display);
+//i.bitmap_unit = 8;
+//i.bitmap_bit_order = MSBFirst;
+//i.bitmap_pad = 8;
+ i.depth = fl_visual->depth;
+ i.bits_per_pixel = pfv->bits_per_pixel;
+
+ if (i.bits_per_pixel & 7) bytes_per_pixel = 0; // produce fatal error
+ else bytes_per_pixel = i.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",i.bits_per_pixel);
+#endif
+
+ // otherwise it is a TrueColor visual:
+ fl_xpixel(0,0,0); // setup fl_redmask, etc, in fl_color.C
+
+ 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
+ ::i.byte_order = WORDS_BIGENDIAN;
+#else
+ ::i.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 (::i.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 ((::i.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 {
+ ::i.byte_order = WORDS_BIGENDIAN;
+ converter = color32_converter;
+ mono_converter = mono32_converter;
+ }
+ break;
+
+ default:
+ Fl::fatal("Can't do %d bits_per_pixel",i.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)
+{
+ if (!linedelta) linedelta = W*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();
+ i.width = w;
+ i.height = h;
+
+ void (*conv)(const uchar *from, uchar *to, int w, int delta) = converter;
+ if (mono) conv = mono_converter;
+
+ // 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)) {
+ i.data = (char *)(buf+delta*dx+linedelta*dy);
+ i.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];
+ }}
+ i.data = (char *)buffer;
+ i.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, &i, 0, 0, X+dx, Y+dy+j-k, w, k);
+ }
+ } else {
+#ifdef __GNUC__
+ STORETYPE linebuf[(W*delta+(sizeof(STORETYPE)-1))/sizeof(STORETYPE)];
+#else
+ STORETYPE* linebuf = new STORETYPE[(W*delta+(sizeof(STORETYPE)-1))/sizeof(STORETYPE)];
+#endif
+ 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, &i, 0, 0, X+dx, Y+dy+j-k, w, k);
+ }
+#ifndef __GNUC__
+ delete[] linebuf;
+#endif
+ }
+ }
+}
+
+void fl_draw_image(const uchar* buf, int x, int y, int w, int h, int d, int l){
+ innards(buf,x,y,w,h,d,l,(d<3&&d>-3),0,0);
+}
+void fl_draw_image(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,(d<3&&d>-3),cb,data);
+}
+void fl_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);
+}
+void fl_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);
+}
+
+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);
+ }
+}
+
+#endif
+// End of fl_draw_image.C
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