ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/fl_draw_pixmap.cxx/
//
// "$Id$"
//
// Pixmap drawing code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2012 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
//
// NOTE: I believe many of the following comments (between the dash markers)
// are no longer accurate:
// --------------------------------------------------------------------
// Implemented without using the xpm library (which I can't use because
// it interferes with the color cube used by fl_draw_image).
// Current implementation is cheap and slow, and works best on a full-color
// display. Transparency is not handled, and colors are dithered to
// the color cube. Color index is achieved by adding the id
// characters together! Also mallocs a lot of temporary memory!
// Notice that there is no pixmap file interface. This is on purpose,
// as I want to discourage programs that require support files to work.
// All data needed by a program ui should be compiled in!!!
// --------------------------------------------------------------------
// The above comments were checked in as r2, and much has changed since then;
// transparency added, color cube not required, etc. -erco Oct 20 2013
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/x.H>
#include <stdio.h>
#include "flstring.h"
static int ncolors, chars_per_pixel;
/**
Get the dimensions of a pixmap.
An XPM image contains the dimensions in its data. This function
returns the width and height.
\param[in] data pointer to XPM image data.
\param[out] w,h width and height of image
\returns non-zero if the dimensions were parsed OK
\returns 0 if there were any problems
*/
int fl_measure_pixmap(/*const*/ char* const* data, int &w, int &h) {
return fl_measure_pixmap((const char*const*)data,w,h);
}
/**
Get the dimensions of a pixmap.
\see fl_measure_pixmap(char* const* data, int &w, int &h)
*/
int fl_measure_pixmap(const char * const *cdata, int &w, int &h) {
int i = sscanf(cdata[0],"%d%d%d%d",&w,&h,&ncolors,&chars_per_pixel);
if (i<4 || w<=0 || h<=0 ||
(chars_per_pixel!=1 && chars_per_pixel!=2) ) return w=0;
return 1;
}
uchar **fl_mask_bitmap; // if non-zero, create bitmap and store pointer here
/**
Draw XPM image data, with the top-left corner at the given position.
The image is dithered on 8-bit displays so you won't lose color
space for programs displaying both images and pixmaps.
\param[in] data pointer to XPM image data
\param[in] x,y position of top-left corner
\param[in] bg background color
\returns 0 if there was any error decoding the XPM data.
*/
int fl_draw_pixmap(/*const*/ char* const* data, int x,int y,Fl_Color bg) {
return fl_draw_pixmap((const char*const*)data,x,y,bg);
}
#ifdef WIN32
// to compute an unused color to be used for the pixmap background
FL_EXPORT UINT win_pixmap_bg_color; // the RGB() of the pixmap background color
static int color_count; // # of non-transparent colors used in pixmap
typedef struct { uchar r; uchar g; uchar b; } UsedColor;
static UsedColor *used_colors;
// Makes an RGB triplet different from all the colors used in the pixmap
// and compute win_pixmap_bg_color from this triplet
static void make_unused_color(uchar &r, uchar &g, uchar &b) {
int i;
r = 2; g = 3; b = 4;
while (1) {
for ( i=0; i<color_count; i++ )
if ( used_colors[i].r == r &&
used_colors[i].g == g &&
used_colors[i].b == b )
break;
if (i >= color_count) {
free((void*)used_colors); used_colors = NULL;
win_pixmap_bg_color = RGB(r, g, b);
return;
}
if (r < 255) {
r++;
} else {
r = 0;
if (g < 255) {
g++;
} else {
g = 0;
b++;
}
}
}
}
#endif
int fl_convert_pixmap(const char*const* cdata, uchar* out, Fl_Color bg) {
int w, h;
const uchar*const* data = (const uchar*const*)(cdata+1);
if (!fl_measure_pixmap(cdata, w, h))
return 0;
if ((chars_per_pixel < 1) || (chars_per_pixel > 2))
return 0;
typedef uchar uchar4[4];
uchar4 *colors = new uchar4[1<<(chars_per_pixel*8)];
#ifdef WIN32
uchar *transparent_c = (uchar *)0; // such that transparent_c[0,1,2] are the RGB of the transparent color
color_count = 0;
used_colors = (UsedColor*)malloc(abs(ncolors) * sizeof(UsedColor));
#endif
if (ncolors < 0) { // FLTK (non standard) compressed colormap
ncolors = -ncolors;
const uchar *p = *data++;
// if first color is ' ' it is transparent (put it later to make
// it not be transparent):
if (*p == ' ') {
uchar* c = colors[(int)' '];
Fl::get_color(bg, c[0], c[1], c[2]); c[3] = 0;
#ifdef WIN32
transparent_c = c;
#endif
p += 4;
ncolors--;
}
// read all the rest of the colors:
for (int i=0; i < ncolors; i++) {
uchar* c = colors[*p++];
#ifdef WIN32
used_colors[color_count].r = *(p+0);
used_colors[color_count].g = *(p+1);
used_colors[color_count].b = *(p+2);
color_count++;
#endif
*c++ = *p++;
*c++ = *p++;
*c++ = *p++;
*c = 255;
}
} else { // normal XPM colormap with names
for (int i=0; i<ncolors; i++) {
const uchar *p = *data++;
// the first 1 or 2 characters are the color index:
int ind = *p++;
uchar* c;
if (chars_per_pixel>1)
ind = (ind<<8)|*p++;
c = colors[ind];
// look for "c word", or last word if none:
const uchar *previous_word = p;
for (;;) {
while (*p && isspace(*p)) p++;
uchar what = *p++;
while (*p && !isspace(*p)) p++;
while (*p && isspace(*p)) p++;
if (!*p) {p = previous_word; break;}
if (what == 'c') break;
previous_word = p;
while (*p && !isspace(*p)) p++;
}
int parse = fl_parse_color((const char*)p, c[0], c[1], c[2]);
c[3] = 255;
if (parse) {
#ifdef WIN32
used_colors[color_count].r = c[0];
used_colors[color_count].g = c[1];
used_colors[color_count].b = c[2];
color_count++;
#endif
} else {
// assume "None" or "#transparent" for any errors
// "bg" should be transparent...
Fl::get_color(bg, c[0], c[1], c[2]);
c[3] = 0;
#ifdef WIN32
transparent_c = c;
#endif
} // if parse
} // for ncolors
} // if ncolors
#ifdef WIN32
if (transparent_c) {
make_unused_color(transparent_c[0], transparent_c[1], transparent_c[2]);
} else {
uchar r, g, b;
make_unused_color(r, g, b);
}
#endif
U32 *q = (U32*)out;
for (int Y = 0; Y < h; Y++) {
const uchar* p = data[Y];
if (chars_per_pixel <= 1) {
for (int X = 0; X < w; X++)
memcpy(q++, colors[*p++], 4);
} else {
for (int X = 0; X < w; X++) {
int ind = (*p++)<<8;
ind |= *p++;
memcpy(q++, colors[ind], 4);
}
}
}
delete[] colors;
return 1;
}
/**
Draw XPM image data, with the top-left corner at the given position.
\see fl_draw_pixmap(char* const* data, int x, int y, Fl_Color bg)
*/
int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg) {
int w, h;
if (!fl_measure_pixmap(cdata, w, h))
return 0;
uchar *buffer = new uchar[w*h*4];
if (!fl_convert_pixmap(cdata, buffer, bg)) {
delete[] buffer;
return 0;
}
// FIXME: Hack until fl_draw_image() supports alpha properly
#ifdef __APPLE_QUARTZ__
if (Fl_Surface_Device::surface() == Fl_Display_Device::display_device()) {
Fl_RGB_Image* rgb = new Fl_RGB_Image(buffer, w, h, 4);
rgb->alloc_array = 1;
rgb->draw(x, y);
delete rgb;
return 1;
} else {
#endif // __APPLE_QUARTZ__
// build the mask bitmap used by Fl_Pixmap:
if (fl_mask_bitmap) {
int W = (w+7)/8;
uchar* bitmap = new uchar[W * h];
*fl_mask_bitmap = bitmap;
const uchar *p = &buffer[3];
uchar b = 0;
for (int Y = 0; Y < h; Y++) {
b = 0;
for (int X = 0, bit = 1; X < w; X++, p += 4) {
if (*p > 127)
b |= bit;
bit <<= 1;
if (bit > 0x80 || X == w-1) {
*bitmap++ = b;
bit = 1;
b = 0;
}
} // if chars_per_pixel
} // for Y
}
fl_draw_image(buffer, x, y, w, h, 4);
#ifdef __APPLE_QUARTZ__
}
#endif
delete[] buffer;
return 1;
}
//
// End of "$Id$".
//