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- //
- // "$Id: fl_draw_image_win32.cxx,v 1.4 1999/01/07 19:17:38 mike Exp $"
- //
- // WIN32 image drawing code for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-1999 by Bill Spitzak and others.
- //
- // This library is free software; you can redistribute it and/or
- // modify it under the terms of the GNU Library General Public
- // License as published by the Free Software Foundation; either
- // version 2 of the License, or (at your option) any later version.
- //
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // Library General Public License for more details.
- //
- // You should have received a copy of the GNU Library General Public
- // License along with this library; if not, write to the Free Software
- // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- // USA.
- //
- // Please report all bugs and problems to "fltk-bugs@easysw.com".
- //
-
- // I hope a simple and portable method of drawing color and monochrome
- // images. To keep this simple, only a single storage type is
- // supported: 8 bit unsigned data, byte order RGB, and pixels are
- // stored packed into rows with the origin at the top-left. It is
- // possible to alter the size of pixels with the "delta" argument, to
- // add alpha or other information per pixel. It is also possible to
- // change the origin and direction of the image data by messing with
- // the "delta" and "linedelta", making them negative, though this may
- // defeat some of the shortcuts in translating the image for X.
-
- // Unbelievably (since it conflicts with how most PC software works)
- // Micro$oft picked a bottom-up and BGR storage format for their
- // DIB images. I'm pretty certain there is a way around this, but
- // I can't find any other than the brute-force method of drawing
- // each line as a seperate image. This may also need to be done
- // if the delta is any amount other than 1, 3, or 4.
-
- ////////////////////////////////////////////////////////////////
-
- #include <config.h>
- #include <FL/Fl.H>
- #include <FL/fl_draw.H>
- #include <FL/x.H>
-
- #define MAXBUFFER 0x40000 // 256k
-
- #if USE_COLORMAP
-
- // error-diffusion dither into the fltk colormap
- static void dither(uchar* to, const uchar* from, int w, int delta) {
- static int ri, gi, bi, dir;
- 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;
- int rr = r*FL_NUM_RED/256;
- r -= rr*255/(FL_NUM_RED-1);
- g += from[1]; if (g < 0) g = 0; else if (g>255) g = 255;
- int gg = g*FL_NUM_GREEN/256;
- g -= gg*255/(FL_NUM_GREEN-1);
- b += from[2]; if (b < 0) b = 0; else if (b>255) b = 255;
- int bb = b*FL_NUM_BLUE/256;
- b -= bb*255/(FL_NUM_BLUE-1);
- *to = uchar(FL_COLOR_CUBE+(bb*FL_NUM_RED+rr)*FL_NUM_GREEN+gg);
- }
- ri = r; gi = g; bi = b;
- }
-
- // error-diffusion dither into the fltk colormap
- static void monodither(uchar* to, const uchar* from, int w, int delta) {
- static int ri,dir;
- 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; if (r < 0) r = 0; else if (r>255) r = 255;
- int rr = r*FL_NUM_GRAY/256;
- r -= rr*255/(FL_NUM_GRAY-1);
- *to = uchar(FL_GRAY_RAMP+rr);
- }
- ri = r;
- }
-
- #endif // USE_COLORMAP
-
- 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 USE_COLORMAP
- char indexed = (fl_palette != 0);
- #endif
-
- if (!linedelta) linedelta = W*delta;
-
- int x, y, w, h;
- fl_clip_box(X,Y,W,H,x,y,w,h);
- if (w<=0 || h<=0) return;
- if (buf) buf += (x-X)*delta + (y-Y)*linedelta;
-
- static U32 bmibuffer[256+12];
- BITMAPINFO &bmi = *((BITMAPINFO*)bmibuffer);
- if (!bmi.bmiHeader.biSize) {
- bmi.bmiHeader.biSize = sizeof(bmi)-4; // does it use this to determine type?
- bmi.bmiHeader.biPlanes = 1;
- bmi.bmiHeader.biCompression = BI_RGB;
- bmi.bmiHeader.biXPelsPerMeter = 0;
- bmi.bmiHeader.biYPelsPerMeter = 0;
- bmi.bmiHeader.biClrUsed = 0;
- bmi.bmiHeader.biClrImportant = 0;
- }
- #if USE_COLORMAP
- if (indexed) {
- for (int i=0; i<256; i++) {
- *((short*)(bmi.bmiColors)+i) = i;
- }
- } else
- #endif
- if (mono) {
- for (int i=0; i<256; i++) {
- bmi.bmiColors[i].rgbBlue = i;
- bmi.bmiColors[i].rgbGreen = i;
- bmi.bmiColors[i].rgbRed = i;
- bmi.bmiColors[i].rgbReserved = i;
- }
- }
- bmi.bmiHeader.biWidth = w;
- #if USE_COLORMAP
- bmi.bmiHeader.biBitCount = mono|indexed ? 8 : 24;
- int pixelsize = mono|indexed ? 1 : 3;
- #else
- bmi.bmiHeader.biBitCount = mono ? 8 : 24;
- int pixelsize = mono ? 1 : 3;
- #endif
- int linesize = (pixelsize*w+3)&~3;
-
- static U32* buffer;
- int blocking = h;
- {int size = linesize*h;
- if (size > MAXBUFFER) {
- size = MAXBUFFER;
- blocking = MAXBUFFER/linesize;
- }
- static long buffer_size;
- if (size > buffer_size) {
- delete[] buffer;
- buffer_size = size;
- buffer = new U32[(size+3)/4];
- }}
- bmi.bmiHeader.biHeight = blocking;
- static U32* line_buffer;
- if (!buf) {
- int size = W*delta;
- static int line_buf_size;
- if (size > line_buf_size) {
- delete[] line_buffer;
- line_buf_size = size;
- line_buffer = new U32[(size+3)/4];
- }
- }
- for (int j=0; j<h; ) {
- int k;
- for (k = 0; j<h && k<blocking; k++, j++) {
- const uchar* from;
- if (!buf) { // run the converter:
- cb(userdata, x-X, y-Y+j, w, (uchar*)line_buffer);
- from = (uchar*)line_buffer;
- } else {
- from = buf;
- buf += linedelta;
- }
- uchar *to = (uchar*)buffer+(blocking-k-1)*linesize;
- #if USE_COLORMAP
- if (indexed) {
- if (mono)
- monodither(to, from, w, delta);
- else
- dither(to, from, w, delta);
- to += w;
- } else
- #endif
- if (mono) {
- for (int i=w; i--; from += delta) *to++ = *from;
- } else {
- for (int i=w; i--; from += delta, to += 3) {
- uchar r = from[0];
- to[0] = from[2];
- to[1] = from[1];
- to[2] = r;
- }
- }
- }
- SetDIBitsToDevice(fl_gc, x, y+j-k, w, k, 0, 0, 0, k,
- (LPSTR)((uchar*)buffer+(blocking-k)*linesize),
- &bmi,
- #if USE_COLORMAP
- indexed ? DIB_PAL_COLORS : DIB_RGB_COLORS
- #else
- DIB_RGB_COLORS
- #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 USE_COLORMAP
- // use the error diffusion dithering code to produce a much nicer block:
- if (fl_palette) {
- uchar c[3];
- c[0] = r; c[1] = g; c[2] = b;
- innards(c,x,y,w,h,0,0,0,0,0);
- return;
- }
- #endif
- fl_color(r,g,b);
- fl_rectf(x,y,w,h);
- }
-
- //
- // End of "$Id: fl_draw_image_win32.cxx,v 1.4 1999/01/07 19:17:38 mike Exp $".
- //
-