ref: e447c9fb929e61a40203b0193ee8d4cab8d72f7e
dir: /DoConfig/fltk/src/fl_draw_image_win32.cxx/
//
// "$Id$"
//
// WIN32 image drawing code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 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.
// 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 separate 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_Printer.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 int fl_abs(int v) { return v<0 ? -v : v; }
static void innards(const uchar *buf, int X, int Y, int W, int H,
int delta, int linedelta, int depth,
Fl_Draw_Image_Cb cb, void* userdata)
{
char indexed = 0;
#if USE_COLORMAP
indexed = (fl_palette != 0);
#endif
if (depth==0) depth = 3;
if (indexed || !fl_can_do_alpha_blending())
depth = (depth-1)|1;
if (!linedelta) linedelta = W*fl_abs(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 (short i=0; i<256; i++) {
*((short*)(bmi.bmiColors)+i) = i;
}
} else
#endif
if (depth<3) {
RGBQUAD *bmi_colors = &bmi.bmiColors[0]; // suppress warning (STR #3199)
for (int i=0; i<256; i++) {
bmi_colors[i].rgbBlue = (uchar)i; // bmi.bmiColors[i]...
bmi_colors[i].rgbGreen = (uchar)i;
bmi_colors[i].rgbRed = (uchar)i;
bmi_colors[i].rgbReserved = (uchar)0; // must be zero
}
}
bmi.bmiHeader.biWidth = w;
#if USE_COLORMAP
bmi.bmiHeader.biBitCount = indexed ? 8 : depth*8;
int pixelsize = indexed ? 1 : depth;
#else
bmi.bmiHeader.biBitCount = depth*8;
int pixelsize = depth;
#endif
if (depth==2) { // special case: gray with alpha
bmi.bmiHeader.biBitCount = 32;
pixelsize = 4;
}
int linesize = (pixelsize*w+3)&~3;
static U32* buffer;
static long buffer_size;
int blocking = h;
{int size = linesize*h;
// when printing, don't limit buffer size not to get a crash in StretchDIBits
if (size > MAXBUFFER && Fl_Surface_Device::surface() == Fl_Display_Device::display_device()) {
size = MAXBUFFER;
blocking = MAXBUFFER/linesize;
}
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 (depth<3)
monodither(to, from, w, delta);
else
dither(to, from, w, delta);
to += w;
} else
#endif
{
int i;
switch (depth) {
case 1:
for (i=w; i--; from += delta) *to++ = *from;
break;
case 2:
for (i=w; i--; from += delta, to += 4) {
uchar a = from[1];
uchar gray = (from[0]*a)>>8;
to[0] = gray;
to[1] = gray;
to[2] = gray;
to[3] = a;
}
break;
case 3:
for (i=w; i--; from += delta, to += 3) {
uchar r = from[0];
to[0] = from[2];
to[1] = from[1];
to[2] = r;
}
break;
case 4:
for (i=w; i--; from += delta, to += 4) {
uchar a = from[3];
uchar r = from[0];
to[0] = (from[2]*a)>>8;
to[1] = (from[1]*a)>>8;
to[2] = (r*a)>>8;
to[3] = from[3];
}
break;
}
}
}
if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) {
// if print context, device and logical units are not equal, so SetDIBitsToDevice
// does not do the expected job, whereas StretchDIBits does it.
StretchDIBits(fl_gc, x, y+j-k, w, k, 0, 0, w, k,
(LPSTR)((uchar*)buffer+(blocking-k)*linesize),
&bmi,
#if USE_COLORMAP
indexed ? DIB_PAL_COLORS : DIB_RGB_COLORS
#else
DIB_RGB_COLORS
#endif
, SRCCOPY );
delete[] buffer;
buffer = NULL;
buffer_size = 0;
}
else {
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_GDI_Graphics_Driver::draw_image(const uchar* buf, int x, int y, int w, int h, int d, int l){
if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
d ^= FL_IMAGE_WITH_ALPHA;
innards(buf,x,y,w,h,d,l,fl_abs(d),0,0);
} else {
innards(buf,x,y,w,h,d,l,(d<3&&d>-3),0,0);
}
}
void Fl_GDI_Graphics_Driver::draw_image(Fl_Draw_Image_Cb cb, void* data,
int x, int y, int w, int h,int d) {
if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
d ^= FL_IMAGE_WITH_ALPHA;
innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data);
} else {
innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data);
}
}
void Fl_GDI_Graphics_Driver::draw_image_mono(const uchar* buf, int x, int y, int w, int h, int d, int l){
if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
d ^= FL_IMAGE_WITH_ALPHA;
innards(buf,x,y,w,h,d,l,1,0,0);
} else {
innards(buf,x,y,w,h,d,l,1,0,0);
}
}
void Fl_GDI_Graphics_Driver::draw_image_mono(Fl_Draw_Image_Cb cb, void* data,
int x, int y, int w, int h,int d) {
if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
d ^= FL_IMAGE_WITH_ALPHA;
innards(0,x,y,w,h,d,0,1,cb,data);
} else {
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$".
//