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fluxbox/src/FbTk/TextureRender.cc

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moved from fluxbox to fbtk
2003-01-09 21:09:49 +00:00
// TextureRender.cc for fluxbox
// Copyright (c) 2002 - 2003 Henrik Kinnunen (fluxgen at users.sourceforge.net)
//
// from Image.cc for Blackbox - an X11 Window manager
// Copyright (c) 1997 - 2000 Brad Hughes (bhughes at tcac.net)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
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// $Id: TextureRender.cc,v 1.3 2003/04/28 22:27:29 fluxgen Exp $
moved from fluxbox to fbtk
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#include "TextureRender.hh"
#include "ImageControl.hh"
#include "App.hh"
#include <iostream>
#include <string>
#include <cstdio>
using namespace std;
namespace FbTk {
TextureRender::TextureRender(ImageControl &imgctrl,
unsigned int w, unsigned int h,
XColor *_colors, size_t num_colors):
control(imgctrl),
colors(_colors),
ncolors(ncolors),
xtable(0), ytable(0) {
width = ((signed) w > 0) ? w : 1;
height = ((signed) h > 0) ? h : 1;
// clamp to "normal" size
if (width > 3200) {
cerr<<"TextureRender: Warning! Width > 3200 setting Width = 3200"<<endl;
width = 3200;
}
if (height > 3200) {
cerr<<"TextureRender: Warning! Height > 3200 setting Height = 3200"<<endl;
height = 3200;
}
red = new (nothrow) unsigned char[width * height];
if (red == 0) {
char sbuf[128];
sprintf(sbuf, "%d", width*height);
throw string("TextureRender::TextureRender(): Out of memory while allocating red buffer."+ string(sbuf));
}
green = new (nothrow) unsigned char[width * height];
if (green == 0) {
char sbuf[128];
sprintf(sbuf, "%d", width*height);
throw string("TextureRender::TextureRender(): Out of memory while allocating green buffer. size " + string(sbuf));
}
blue = new (nothrow) unsigned char[width * height];
if (blue == 0) {
char sbuf[128];
sprintf(sbuf, "%d", width*height);
throw string("TextureRender::TextureRender(): Out of memory while allocating blue buffer. size " + string(sbuf));
}
cpc = imgctrl.colorsPerChannel();
cpccpc = cpc * cpc;
imgctrl.colorTables(&red_table, &green_table, &blue_table,
&red_offset, &green_offset, &blue_offset,
&red_bits, &green_bits, &blue_bits);
}
TextureRender::~TextureRender() {
delete [] red;
delete [] green;
delete [] blue;
}
Pixmap TextureRender::render(const FbTk::Texture &texture) {
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if (texture.pixmap().drawable() != 0)
return renderPixmap(texture);
else if (texture.type() & FbTk::Texture::PARENTRELATIVE)
moved from fluxbox to fbtk
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return ParentRelative;
else if (texture.type() & FbTk::Texture::SOLID)
return renderSolid(texture);
else if (texture.type() & FbTk::Texture::GRADIENT)
return renderGradient(texture);
return None;
}
Pixmap TextureRender::renderSolid(const FbTk::Texture &texture) {
Display *disp = FbTk::App::instance()->display();
Pixmap pixmap = XCreatePixmap(disp,
RootWindow(disp, control.screenNum()), width,
height, control.depth());
if (pixmap == None) {
removed i18n
2003-01-10 01:02:02 +00:00
cerr<<"FbTk::TextureRender::render_solid(): error creating pixmap"<<endl;
moved from fluxbox to fbtk
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return None;
}
XGCValues gcv;
GC gc, hgc, lgc;
gcv.foreground = texture.color().pixel();
gcv.fill_style = FillSolid;
gc = XCreateGC(disp, pixmap, GCForeground | GCFillStyle, &gcv);
gcv.foreground = texture.hiColor().pixel();
hgc = XCreateGC(disp, pixmap, GCForeground, &gcv);
gcv.foreground = texture.loColor().pixel();
lgc = XCreateGC(disp, pixmap, GCForeground, &gcv);
XFillRectangle(disp, pixmap, gc, 0, 0, width, height);
using namespace FbTk;
if (texture.type() & Texture::INTERLACED) {
gcv.foreground = texture.colorTo().pixel();
GC igc = XCreateGC(disp, pixmap,
GCForeground, &gcv);
register unsigned int i = 0;
for (; i < height; i += 2)
XDrawLine(disp, pixmap, igc, 0, i, width, i);
XFreeGC(disp, igc);
}
if (texture.type() & Texture::BEVEL1) {
if (texture.type() & Texture::RAISED) {
XDrawLine(disp, pixmap, lgc,
0, height - 1, width - 1, height - 1);
XDrawLine(disp, pixmap, lgc,
width - 1, height - 1, width - 1, 0);
XDrawLine(disp, pixmap, hgc,
0, 0, width - 1, 0);
XDrawLine(disp, pixmap, hgc,
0, height - 1, 0, 0);
} else if (texture.type() & Texture::SUNKEN) {
XDrawLine(disp, pixmap, hgc,
0, height - 1, width - 1, height - 1);
XDrawLine(disp, pixmap, hgc,
width - 1, height - 1, width - 1, 0);
XDrawLine(disp, pixmap, lgc,
0, 0, width - 1, 0);
XDrawLine(disp, pixmap, lgc,
0, height - 1, 0, 0);
}
} else if (texture.type() & Texture::BEVEL2) {
if (texture.type() & Texture::RAISED) {
XDrawLine(disp, pixmap, lgc,
1, height - 3, width - 3, height - 3);
XDrawLine(disp, pixmap, lgc,
width - 3, height - 3, width - 3, 1);
XDrawLine(disp, pixmap, hgc,
1, 1, width - 3, 1);
XDrawLine(disp, pixmap, hgc,
1, height - 3, 1, 1);
} else if (texture.type() & Texture::SUNKEN) {
XDrawLine(disp, pixmap, hgc,
1, height - 3, width - 3, height - 3);
XDrawLine(disp, pixmap, hgc,
width - 3, height - 3, width - 3, 1);
XDrawLine(disp, pixmap, lgc,
1, 1, width - 3, 1);
XDrawLine(disp, pixmap, lgc,
1, height - 3, 1, 1);
}
}
XFreeGC(disp, gc);
XFreeGC(disp, hgc);
XFreeGC(disp, lgc);
return pixmap;
}
Pixmap TextureRender::renderGradient(const FbTk::Texture &texture) {
bool inverted = false;
using namespace FbTk;
interlaced = texture.type() & Texture::INTERLACED;
if (texture.type() & Texture::SUNKEN) {
from = &(texture.colorTo());
to = &(texture.color());
if (! (texture.type() & Texture::INVERT))
inverted = true;
} else {
from = &(texture.color());
to = &(texture.colorTo());
if (texture.type() & Texture::INVERT)
inverted = true;
}
control.getGradientBuffers(width, height, &xtable, &ytable);
if (texture.type() & Texture::DIAGONAL)
dgradient();
else if (texture.type() & Texture::ELLIPTIC)
egradient();
else if (texture.type() & Texture::HORIZONTAL)
hgradient();
else if (texture.type() & Texture::PYRAMID)
pgradient();
else if (texture.type() & Texture::RECTANGLE)
rgradient();
else if (texture.type() & Texture::VERTICAL)
vgradient();
else if (texture.type() & Texture::CROSSDIAGONAL)
cdgradient();
else if (texture.type() & Texture::PIPECROSS)
pcgradient();
if (texture.type() & Texture::BEVEL1)
bevel1();
else if (texture.type() & Texture::BEVEL2)
bevel2();
if (inverted)
invert();
return renderPixmap();
}
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Pixmap TextureRender::renderPixmap(const FbTk::Texture &src_texture) {
if (width != src_texture.pixmap().width() ||
height != src_texture.pixmap().height()) {
// copy src_texture's pixmap and
// scale to fit our size
FbPixmap new_pm(src_texture.pixmap());
new_pm.scale(width, height);
return new_pm.release();
}
// return copy of pixmap
return FbPixmap(src_texture.pixmap()).release();
}
moved from fluxbox to fbtk
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XImage *TextureRender::renderXImage() {
Display *disp = FbTk::App::instance()->display();
XImage *image =
XCreateImage(disp,
DefaultVisual(disp, control.screenNum()), control.depth(), ZPixmap, 0, 0,
width, height, 32, 0);
if (! image) {
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cerr<<"FbTk::TextureRender::renderXImage(): error creating XImage"<<endl;
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return 0;
}
image->data = 0;
unsigned char *d = new unsigned char[image->bytes_per_line * (height + 1)];
register unsigned int x, y, dithx, dithy, r, g, b, o, er, eg, eb, offset;
unsigned char *pixel_data = d, *ppixel_data = d;
unsigned long pixel;
o = image->bits_per_pixel + ((image->byte_order == MSBFirst) ? 1 : 0);
if (control.doDither() && width > 1 && height > 1) {
unsigned char dither4[4][4] = {
{0, 4, 1, 5},
{6, 2, 7, 3},
{1, 5, 0, 4},
{7, 3, 6, 2} };
#ifdef ORDEREDPSEUDO
unsigned char dither8[8][8] = {
{ 0, 32, 8, 40, 2, 34, 10, 42 },
{ 48, 16, 56, 24, 50, 18, 58, 26 },
{ 12, 44, 4, 36, 14, 46, 6, 38 },
{ 60, 28, 52, 20, 62, 30, 54, 22 },
{ 3, 35, 11, 43, 1, 33, 9, 41 },
{ 51, 19, 59, 27, 49, 17, 57, 25 },
{ 15, 47, 7, 39, 13, 45, 5, 37 },
{ 63, 31, 55, 23, 61, 29, 53, 21 } };
#endif // ORDEREDPSEUDO
switch (control.visual()->c_class) {
case TrueColor:
// algorithm: ordered dithering... many many thanks to rasterman
// (raster@rasterman.com) for telling me about this... portions of this
// code is based off of his code in Imlib
for (y = 0, offset = 0; y < height; y++) {
dithy = y & 0x3;
for (x = 0; x < width; x++, offset++) {
dithx = x & 0x3;
r = red[offset];
g = green[offset];
b = blue[offset];
er = r & (red_bits - 1);
eg = g & (green_bits - 1);
eb = b & (blue_bits - 1);
r = red_table[r];
g = green_table[g];
b = blue_table[b];
if ((dither4[dithy][dithx] < er) && (r < red_table[255])) r++;
if ((dither4[dithy][dithx] < eg) && (g < green_table[255])) g++;
if ((dither4[dithy][dithx] < eb) && (b < blue_table[255])) b++;
pixel = (r << red_offset) | (g << green_offset) | (b << blue_offset);
switch (o) {
case 8: // 8bpp
*pixel_data++ = pixel;
break;
case 16: // 16bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
break;
case 17: // 16bpp MSB
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
case 24: // 24bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel >> 16;
break;
case 25: // 24bpp MSB
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
case 32: // 32bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 24;
break;
case 33: // 32bpp MSB
*pixel_data++ = pixel >> 24;
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
}
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
break;
case StaticColor:
case PseudoColor: {
#ifndef ORDEREDPSEUDO
short *terr,
*rerr = new short[width + 2],
*gerr = new short[width + 2],
*berr = new short[width + 2],
*nrerr = new short[width + 2],
*ngerr = new short[width + 2],
*nberr = new short[width + 2];
int rr, gg, bb, rer, ger, ber;
int dd = 255 / control.colorsPerChannel();
for (x = 0; x < width; x++) {
*(rerr + x) = *(red + x);
*(gerr + x) = *(green + x);
*(berr + x) = *(blue + x);
}
*(rerr + x) = *(gerr + x) = *(berr + x) = 0;
#endif // ORDEREDPSEUDO
for (y = 0, offset = 0; y < height; y++) {
#ifdef ORDEREDPSEUDO
dithy = y & 7;
for (x = 0; x < width; x++, offset++) {
dithx = x & 7;
r = red[offset];
g = green[offset];
b = blue[offset];
er = r & (red_bits - 1);
eg = g & (green_bits - 1);
eb = b & (blue_bits - 1);
r = red_table[r];
g = green_table[g];
b = blue_table[b];
if ((dither8[dithy][dithx] < er) && (r < red_table[255])) r++;
if ((dither8[dithy][dithx] < eg) && (g < green_table[255])) g++;
if ((dither8[dithy][dithx] < eb) && (b < blue_table[255])) b++;
pixel = (r * cpccpc) + (g * cpc) + b;
*(pixel_data++) = colors[pixel].pixel;
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
#else // !ORDEREDPSEUDO
if (y < (height - 1)) {
int i = offset + width;
for (x = 0; x < width; x++, i++) {
*(nrerr + x) = *(red + i);
*(ngerr + x) = *(green + i);
*(nberr + x) = *(blue + i);
}
*(nrerr + x) = *(red + (--i));
*(ngerr + x) = *(green + i);
*(nberr + x) = *(blue + i);
}
for (x = 0; x < width; x++) {
rr = rerr[x];
gg = gerr[x];
bb = berr[x];
if (rr > 255) rr = 255; else if (rr < 0) rr = 0;
if (gg > 255) gg = 255; else if (gg < 0) gg = 0;
if (bb > 255) bb = 255; else if (bb < 0) bb = 0;
r = red_table[rr];
g = green_table[gg];
b = blue_table[bb];
rer = rerr[x] - r*dd;
ger = gerr[x] - g*dd;
ber = berr[x] - b*dd;
pixel = (r * cpccpc) + (g * cpc) + b;
*pixel_data++ = colors[pixel].pixel;
r = rer >> 1;
g = ger >> 1;
b = ber >> 1;
rerr[x+1] += r;
gerr[x+1] += g;
berr[x+1] += b;
nrerr[x] += r;
ngerr[x] += g;
nberr[x] += b;
}
offset += width;
pixel_data = (ppixel_data += image->bytes_per_line);
terr = rerr;
rerr = nrerr;
nrerr = terr;
terr = gerr;
gerr = ngerr;
ngerr = terr;
terr = berr;
berr = nberr;
nberr = terr;
}
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delete [] rerr;
delete [] gerr;
delete [] berr;
delete [] nrerr;
delete [] ngerr;
delete [] nberr;
moved from fluxbox to fbtk
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#endif // ORDEREDPSUEDO
} break;
/*
case StaticGray:
case GrayScale:
for (y = 0, offset = 0; y < height; y++) {
dithy = y & 0x3;
for (x = 0; x < width; x++, offset++) {
dithx = x & 0x3;
r = *(red + offset);
g = *(green + offset);
b = *(blue + offset);
er = r & 0x7;
eg = g & 0x7;
eb = b & 0x7;
if ((dither[dithy][dithx] < er) && (r < (256 - 8)))
r += 8;
if ((dither[dithy][dithx] < (eg << 1)) && (g < (256 - 4)))
g += 4;
if ((dither[dithy][dithx] < eb) && (b < (256 - 8)))
b += 8;
r = *(red_table + r);
g = *(green_table + g);
b = *(blue_table + b);
g = ((r * 30) + (g * 59) + (b * 11)) / 100;
*pixel_data++ = colors[g].pixel;
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
break;
*/
default:
removed i18n
2003-01-10 01:02:02 +00:00
cerr<<"TextureRender::renderXImage(): unsupported visual"<<endl;
moved from fluxbox to fbtk
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delete [] d;
XDestroyImage(image);
return (XImage *) 0;
}
} else {
switch (control.visual()->c_class) {
case StaticColor:
case PseudoColor:
for (y = 0, offset = 0; y < height; y++) {
for (x = 0; x < width; x++, offset++) {
r = red_table[red[offset]];
g = green_table[green[offset]];
b = blue_table[blue[offset]];
pixel = (r * cpccpc) + (g * cpc) + b;
*pixel_data++ = colors[pixel].pixel;
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
break;
case TrueColor:
for (y = 0, offset = 0; y < height; y++) {
for (x = 0; x < width; x++, offset++) {
r = red_table[red[offset]];
g = green_table[green[offset]];
b = blue_table[blue[offset]];
pixel = (r << red_offset) | (g << green_offset) | (b << blue_offset);
switch (o) {
case 8: // 8bpp
*pixel_data++ = pixel;
break;
case 16: // 16bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
break;
case 17: // 16bpp MSB
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
case 24: // 24bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel >> 16;
break;
case 25: // 24bpp MSB
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
case 32: // 32bpp LSB
*pixel_data++ = pixel;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 24;
break;
case 33: // 32bpp MSB
*pixel_data++ = pixel >> 24;
*pixel_data++ = pixel >> 16;
*pixel_data++ = pixel >> 8;
*pixel_data++ = pixel;
break;
}
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
break;
case StaticGray:
case GrayScale:
for (y = 0, offset = 0; y < height; y++) {
for (x = 0; x < width; x++, offset++) {
r = *(red_table + *(red + offset));
g = *(green_table + *(green + offset));
b = *(blue_table + *(blue + offset));
g = ((r * 30) + (g * 59) + (b * 11)) / 100;
*pixel_data++ = colors[g].pixel;
}
pixel_data = (ppixel_data += image->bytes_per_line);
}
break;
default:
removed i18n
2003-01-10 01:02:02 +00:00
cerr<<"TextureRender::renderXImage(): unsupported visual"<<endl;
moved from fluxbox to fbtk
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delete [] d;
XDestroyImage(image);
return (XImage *) 0;
}
}
image->data = (char *) d;
return image;
}
Pixmap TextureRender::renderPixmap() {
Display *disp = FbTk::App::instance()->display();
Pixmap pixmap =
XCreatePixmap(disp,
RootWindow(disp, control.screenNum()), width, height, control.depth());
if (pixmap == None) {
removed i18n
2003-01-10 01:02:02 +00:00
cerr<<"TextureRender::renderPixmap(): error creating pixmap"<<endl;
moved from fluxbox to fbtk
2003-01-09 21:09:49 +00:00
return None;
}
XImage *image = renderXImage();
if (! image) {
XFreePixmap(disp, pixmap);
return None;
} else if (! image->data) {
XDestroyImage(image);
XFreePixmap(disp, pixmap);
return None;
}
XPutImage(disp, pixmap,
DefaultGC(disp, control.screenNum()),
image, 0, 0, 0, 0, width, height);
if (image->data != 0) {
delete [] image->data;
image->data = 0;
}
XDestroyImage(image);
return pixmap;
}
void TextureRender::bevel1() {
if (! (width > 2 && height > 2))
return;
unsigned char *pr = red, *pg = green, *pb = blue;
register unsigned char r, g, b, rr ,gg ,bb;
register unsigned int w = width, h = height - 1, wh = w * h;
while (--w) {
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*pr = rr;
*pg = gg;
*pb = bb;
r = *(pr + wh);
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *(pg + wh);
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *(pb + wh);
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*((pr++) + wh) = rr;
*((pg++) + wh) = gg;
*((pb++) + wh) = bb;
}
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*pr = rr;
*pg = gg;
*pb = bb;
r = *(pr + wh);
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *(pg + wh);
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *(pb + wh);
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*(pr + wh) = rr;
*(pg + wh) = gg;
*(pb + wh) = bb;
pr = red + width;
pg = green + width;
pb = blue + width;
while (--h) {
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*pr = rr;
*pg = gg;
*pb = bb;
pr += width - 1;
pg += width - 1;
pb += width - 1;
r = *pr;
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *pg;
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *pb;
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*(pr++) = rr;
*(pg++) = gg;
*(pb++) = bb;
}
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*pr = rr;
*pg = gg;
*pb = bb;
pr += width - 1;
pg += width - 1;
pb += width - 1;
r = *pr;
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *pg;
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *pb;
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*pr = rr;
*pg = gg;
*pb = bb;
}
void TextureRender::bevel2() {
if (! (width > 4 && height > 4))
return;
unsigned char r, g, b, rr ,gg ,bb, *pr = red + width + 1,
*pg = green + width + 1, *pb = blue + width + 1;
unsigned int w = width - 2, h = height - 1, wh = width * (height - 3);
while (--w) {
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*pr = rr;
*pg = gg;
*pb = bb;
r = *(pr + wh);
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *(pg + wh);
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *(pb + wh);
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*((pr++) + wh) = rr;
*((pg++) + wh) = gg;
*((pb++) + wh) = bb;
}
pr = red + width;
pg = green + width;
pb = blue + width;
while (--h) {
r = *pr;
rr = r + (r >> 1);
if (rr < r) rr = ~0;
g = *pg;
gg = g + (g >> 1);
if (gg < g) gg = ~0;
b = *pb;
bb = b + (b >> 1);
if (bb < b) bb = ~0;
*(++pr) = rr;
*(++pg) = gg;
*(++pb) = bb;
pr += width - 3;
pg += width - 3;
pb += width - 3;
r = *pr;
rr = (r >> 2) + (r >> 1);
if (rr > r) rr = 0;
g = *pg;
gg = (g >> 2) + (g >> 1);
if (gg > g) gg = 0;
b = *pb;
bb = (b >> 2) + (b >> 1);
if (bb > b) bb = 0;
*(pr++) = rr;
*(pg++) = gg;
*(pb++) = bb;
pr++; pg++; pb++;
}
}
void TextureRender::invert() {
register unsigned int i, j, wh = (width * height) - 1;
unsigned char tmp;
for (i = 0, j = wh; j > i; j--, i++) {
tmp = *(red + j);
*(red + j) = *(red + i);
*(red + i) = tmp;
tmp = *(green + j);
*(green + j) = *(green + i);
*(green + i) = tmp;
tmp = *(blue + j);
*(blue + j) = *(blue + i);
*(blue + i) = tmp;
}
}
void TextureRender::dgradient() {
// diagonal gradient code was written by Mike Cole <mike@mydot.com>
// modified for interlacing by Brad Hughes
float drx, dgx, dbx, dry, dgy, dby, yr = 0.0, yg = 0.0, yb = 0.0,
xr = (float) from->red(),
xg = (float) from->green(),
xb = (float) from->blue();
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int w = width * 2, h = height * 2;
unsigned int *xt = xtable, *yt = ytable;
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
// Create X table
drx /= w;
dgx /= w;
dbx /= w;
for (x = 0; x < width; x++) {
*(xt++) = (unsigned char) (xr);
*(xt++) = (unsigned char) (xg);
*(xt++) = (unsigned char) (xb);
xr += drx;
xg += dgx;
xb += dbx;
}
// Create Y table
dry /= h;
dgy /= h;
dby /= h;
for (y = 0; y < height; y++) {
*(yt++) = ((unsigned char) yr);
*(yt++) = ((unsigned char) yg);
*(yt++) = ((unsigned char) yb);
yr += dry;
yg += dgy;
yb += dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal dgradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = *(xt++) + *(yt);
*(pg++) = *(xt++) + *(yt + 1);
*(pb++) = *(xt++) + *(yt + 2);
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = *(xt++) + *(yt);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = *(xt++) + *(yt + 1);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = *(xt++) + *(yt + 2);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = *(xt++) + *(yt);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = *(xt++) + *(yt + 1);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = *(xt++) + *(yt + 2);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
void TextureRender::hgradient() {
float drx, dgx, dbx,
xr = (float) from->red(),
xg = (float) from->green(),
xb = (float) from->blue();
unsigned char *pr = red, *pg = green, *pb = blue;
register unsigned int x, y;
drx = (float) (to->red() - from->red());
dgx = (float) (to->green() - from->green());
dbx = (float) (to->blue() - from->blue());
drx /= width;
dgx /= width;
dbx /= width;
if (interlaced && height > 2) {
// faked interlacing effect
unsigned char channel, channel2;
for (x = 0; x < width; x++, pr++, pg++, pb++) {
channel = (unsigned char) xr;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*pr = channel2;
channel = (unsigned char) xg;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*pg = channel2;
channel = (unsigned char) xb;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*pb = channel2;
channel = (unsigned char) xr;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr + width) = channel2;
channel = (unsigned char) xg;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg + width) = channel2;
channel = (unsigned char) xb;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb + width) = channel2;
xr += drx;
xg += dgx;
xb += dbx;
}
pr += width;
pg += width;
pb += width;
int offset;
for (y = 2; y < height; y++, pr += width, pg += width, pb += width) {
if (y & 1) offset = width; else offset = 0;
memcpy(pr, (red + offset), width);
memcpy(pg, (green + offset), width);
memcpy(pb, (blue + offset), width);
}
} else {
// normal hgradient
for (x = 0; x < width; x++) {
*(pr++) = (unsigned char) (xr);
*(pg++) = (unsigned char) (xg);
*(pb++) = (unsigned char) (xb);
xr += drx;
xg += dgx;
xb += dbx;
}
for (y = 1; y < height; y++, pr += width, pg += width, pb += width) {
memcpy(pr, red, width);
memcpy(pg, green, width);
memcpy(pb, blue, width);
}
}
}
void TextureRender::vgradient() {
float dry, dgy, dby,
yr = (float) from->red(),
yg = (float) from->green(),
yb = (float) from->blue();
unsigned char *pr = red, *pg = green, *pb = blue;
register unsigned int y;
dry = (float) (to->red() - from->red());
dgy = (float) (to->green() - from->green());
dby = (float) (to->blue() - from->blue());
dry /= height;
dgy /= height;
dby /= height;
if (interlaced) {
// faked interlacing effect
unsigned char channel, channel2;
for (y = 0; y < height; y++, pr += width, pg += width, pb += width) {
if (y & 1) {
channel = (unsigned char) yr;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
memset(pr, channel2, width);
channel = (unsigned char) yg;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
memset(pg, channel2, width);
channel = (unsigned char) yb;
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
memset(pb, channel2, width);
} else {
channel = (unsigned char) yr;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
memset(pr, channel2, width);
channel = (unsigned char) yg;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
memset(pg, channel2, width);
channel = (unsigned char) yb;
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
memset(pb, channel2, width);
}
yr += dry;
yg += dgy;
yb += dby;
}
} else {
// normal vgradient
for (y = 0; y < height; y++, pr += width, pg += width, pb += width) {
memset(pr, (unsigned char) yr, width);
memset(pg, (unsigned char) yg, width);
memset(pb, (unsigned char) yb, width);
yr += dry;
yg += dgy;
yb += dby;
}
}
}
void TextureRender::pgradient() {
// pyramid gradient - based on original dgradient, written by
// Mosfet (mosfet@kde.org)
// adapted from kde sources for Blackbox by Brad Hughes
float yr, yg, yb, drx, dgx, dbx, dry, dgy, dby,
xr, xg, xb;
int rsign, gsign, bsign;
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int tr = to->red(), tg = to->green(), tb = to->blue();
unsigned int *xt = xtable, *yt = ytable;
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
rsign = (drx < 0) ? -1 : 1;
gsign = (dgx < 0) ? -1 : 1;
bsign = (dbx < 0) ? -1 : 1;
xr = yr = (drx / 2);
xg = yg = (dgx / 2);
xb = yb = (dbx / 2);
// Create X table
drx /= width;
dgx /= width;
dbx /= width;
for (x = 0; x < width; x++) {
*(xt++) = (unsigned char) ((xr < 0) ? -xr : xr);
*(xt++) = (unsigned char) ((xg < 0) ? -xg : xg);
*(xt++) = (unsigned char) ((xb < 0) ? -xb : xb);
xr -= drx;
xg -= dgx;
xb -= dbx;
}
// Create Y table
dry /= height;
dgy /= height;
dby /= height;
for (y = 0; y < height; y++) {
*(yt++) = ((unsigned char) ((yr < 0) ? -yr : yr));
*(yt++) = ((unsigned char) ((yg < 0) ? -yg : yg));
*(yt++) = ((unsigned char) ((yb < 0) ? -yb : yb));
yr -= dry;
yg -= dgy;
yb -= dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal pgradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = (unsigned char) (tr - (rsign * (*(xt++) + *(yt))));
*(pg++) = (unsigned char) (tg - (gsign * (*(xt++) + *(yt + 1))));
*(pb++) = (unsigned char) (tb - (bsign * (*(xt++) + *(yt + 2))));
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = (unsigned char) (tr - (rsign * (*(xt++) + *(yt))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (gsign * (*(xt++) + *(yt + 1))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (bsign * (*(xt++) + *(yt + 2))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = (unsigned char) (tr - (rsign * (*(xt++) + *(yt))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (gsign * (*(xt++) + *(yt + 1))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (bsign * (*(xt++) + *(yt + 2))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
void TextureRender::rgradient() {
// rectangle gradient - based on original dgradient, written by
// Mosfet (mosfet@kde.org)
// adapted from kde sources for Blackbox by Brad Hughes
float drx, dgx, dbx, dry, dgy, dby, xr, xg, xb, yr, yg, yb;
int rsign, gsign, bsign;
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int tr = to->red(), tg = to->green(), tb = to->blue();
unsigned int *xt = xtable, *yt = ytable;
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
rsign = (drx < 0) ? -2 : 2;
gsign = (dgx < 0) ? -2 : 2;
bsign = (dbx < 0) ? -2 : 2;
xr = yr = (drx / 2);
xg = yg = (dgx / 2);
xb = yb = (dbx / 2);
// Create X table
drx /= width;
dgx /= width;
dbx /= width;
for (x = 0; x < width; x++) {
*(xt++) = (unsigned char) ((xr < 0) ? -xr : xr);
*(xt++) = (unsigned char) ((xg < 0) ? -xg : xg);
*(xt++) = (unsigned char) ((xb < 0) ? -xb : xb);
xr -= drx;
xg -= dgx;
xb -= dbx;
}
// Create Y table
dry /= height;
dgy /= height;
dby /= height;
for (y = 0; y < height; y++) {
*(yt++) = ((unsigned char) ((yr < 0) ? -yr : yr));
*(yt++) = ((unsigned char) ((yg < 0) ? -yg : yg));
*(yt++) = ((unsigned char) ((yb < 0) ? -yb : yb));
yr -= dry;
yg -= dgy;
yb -= dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal rgradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = (unsigned char) (tr - (rsign * std::max(*(xt++), *(yt))));
*(pg++) = (unsigned char) (tg - (gsign * std::max(*(xt++), *(yt + 1))));
*(pb++) = (unsigned char) (tb - (bsign * std::max(*(xt++), *(yt + 2))));
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = (unsigned char) (tr - (rsign * std::max(*(xt++), *(yt))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (gsign * std::max(*(xt++), *(yt + 1))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (bsign * std::max(*(xt++), *(yt + 2))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = (unsigned char) (tr - (rsign * std::max(*(xt++), *(yt))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (gsign * std::max(*(xt++), *(yt + 1))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (bsign * std::max(*(xt++), *(yt + 2))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
void TextureRender::egradient() {
// elliptic gradient - based on original dgradient, written by
// Mosfet (mosfet@kde.org)
// adapted from kde sources for Blackbox by Brad Hughes
float drx, dgx, dbx, dry, dgy, dby, yr, yg, yb, xr, xg, xb;
int rsign, gsign, bsign;
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int *xt = xtable, *yt = ytable;
unsigned int tr = (unsigned long) to->red(),
tg = (unsigned long) to->green(),
tb = (unsigned long) to->blue();
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
rsign = (drx < 0) ? -1 : 1;
gsign = (dgx < 0) ? -1 : 1;
bsign = (dbx < 0) ? -1 : 1;
xr = yr = (drx / 2);
xg = yg = (dgx / 2);
xb = yb = (dbx / 2);
// Create X table
drx /= width;
dgx /= width;
dbx /= width;
for (x = 0; x < width; x++) {
*(xt++) = (unsigned long) (xr * xr);
*(xt++) = (unsigned long) (xg * xg);
*(xt++) = (unsigned long) (xb * xb);
xr -= drx;
xg -= dgx;
xb -= dbx;
}
// Create Y table
dry /= height;
dgy /= height;
dby /= height;
for (y = 0; y < height; y++) {
*(yt++) = (unsigned long) (yr * yr);
*(yt++) = (unsigned long) (yg * yg);
*(yt++) = (unsigned long) (yb * yb);
yr -= dry;
yg -= dgy;
yb -= dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal egradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = (unsigned char)
(tr - (rsign * control.getSqrt(*(xt++) + *(yt))));
*(pg++) = (unsigned char)
(tg - (gsign * control.getSqrt(*(xt++) + *(yt + 1))));
*(pb++) = (unsigned char)
(tb - (bsign * control.getSqrt(*(xt++) + *(yt + 2))));
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = (unsigned char)
(tr - (rsign * control.getSqrt(*(xt++) + *(yt))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = (unsigned char)
(tg - (gsign * control.getSqrt(*(xt++) + *(yt + 1))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = (unsigned char)
(tb - (bsign * control.getSqrt(*(xt++) + *(yt + 2))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = (unsigned char)
(tr - (rsign * control.getSqrt(*(xt++) + *(yt))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = (unsigned char)
(tg - (gsign * control.getSqrt(*(xt++) + *(yt + 1))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = (unsigned char)
(tb - (bsign * control.getSqrt(*(xt++) + *(yt + 2))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
void TextureRender::pcgradient() {
// pipe cross gradient - based on original dgradient, written by
// Mosfet (mosfet@kde.org)
// adapted from kde sources for Blackbox by Brad Hughes
float drx, dgx, dbx, dry, dgy, dby, xr, xg, xb, yr, yg, yb;
int rsign, gsign, bsign;
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int *xt = xtable, *yt = ytable;
unsigned int tr = to->red(),
tg = to->green(),
tb = to->blue();
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
rsign = (drx < 0) ? -2 : 2;
gsign = (dgx < 0) ? -2 : 2;
bsign = (dbx < 0) ? -2 : 2;
xr = yr = (drx / 2);
xg = yg = (dgx / 2);
xb = yb = (dbx / 2);
// Create X table
drx /= width;
dgx /= width;
dbx /= width;
for (x = 0; x < width; x++) {
*(xt++) = (unsigned char) ((xr < 0) ? -xr : xr);
*(xt++) = (unsigned char) ((xg < 0) ? -xg : xg);
*(xt++) = (unsigned char) ((xb < 0) ? -xb : xb);
xr -= drx;
xg -= dgx;
xb -= dbx;
}
// Create Y table
dry /= height;
dgy /= height;
dby /= height;
for (y = 0; y < height; y++) {
*(yt++) = ((unsigned char) ((yr < 0) ? -yr : yr));
*(yt++) = ((unsigned char) ((yg < 0) ? -yg : yg));
*(yt++) = ((unsigned char) ((yb < 0) ? -yb : yb));
yr -= dry;
yg -= dgy;
yb -= dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal pcgradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = (unsigned char) (tr - (rsign * std::min(*(xt++), *(yt))));
*(pg++) = (unsigned char) (tg - (gsign * std::min(*(xt++), *(yt + 1))));
*(pb++) = (unsigned char) (tb - (bsign * std::min(*(xt++), *(yt + 2))));
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = (unsigned char) (tr - (rsign * std::min(*(xt++), *(yt))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (bsign * std::min(*(xt++), *(yt + 1))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (gsign * std::min(*(xt++), *(yt + 2))));
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = (unsigned char) (tr - (rsign * std::min(*(xt++), *(yt))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = (unsigned char) (tg - (gsign * std::min(*(xt++), *(yt + 1))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = (unsigned char) (tb - (bsign * std::min(*(xt++), *(yt + 2))));
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
void TextureRender::cdgradient() {
// cross diagonal gradient - based on original dgradient, written by
// Mosfet (mosfet@kde.org)
// adapted from kde sources for Blackbox by Brad Hughes
float drx, dgx, dbx, dry, dgy, dby, yr = 0.0, yg = 0.0, yb = 0.0,
xr = (float) from->red(),
xg = (float) from->green(),
xb = (float) from->blue();
unsigned char *pr = red, *pg = green, *pb = blue;
unsigned int w = width * 2, h = height * 2, *xt, *yt;
register unsigned int x, y;
dry = drx = (float) (to->red() - from->red());
dgy = dgx = (float) (to->green() - from->green());
dby = dbx = (float) (to->blue() - from->blue());
// Create X table
drx /= w;
dgx /= w;
dbx /= w;
for (xt = (xtable + (width * 3) - 1), x = 0; x < width; x++) {
*(xt--) = (unsigned char) xb;
*(xt--) = (unsigned char) xg;
*(xt--) = (unsigned char) xr;
xr += drx;
xg += dgx;
xb += dbx;
}
// Create Y table
dry /= h;
dgy /= h;
dby /= h;
for (yt = ytable, y = 0; y < height; y++) {
*(yt++) = (unsigned char) yr;
*(yt++) = (unsigned char) yg;
*(yt++) = (unsigned char) yb;
yr += dry;
yg += dgy;
yb += dby;
}
// Combine tables to create gradient
if (! interlaced) {
// normal cdgradient
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
*(pr++) = *(xt++) + *(yt);
*(pg++) = *(xt++) + *(yt + 1);
*(pb++) = *(xt++) + *(yt + 2);
}
}
} else {
// faked interlacing effect
unsigned char channel, channel2;
for (yt = ytable, y = 0; y < height; y++, yt += 3) {
for (xt = xtable, x = 0; x < width; x++) {
if (y & 1) {
channel = *(xt++) + *(yt);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pr++) = channel2;
channel = *(xt++) + *(yt + 1);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pg++) = channel2;
channel = *(xt++) + *(yt + 2);
channel2 = (channel >> 1) + (channel >> 2);
if (channel2 > channel) channel2 = 0;
*(pb++) = channel2;
} else {
channel = *(xt++) + *(yt);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pr++) = channel2;
channel = *(xt++) + *(yt + 1);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pg++) = channel2;
channel = *(xt++) + *(yt + 2);
channel2 = channel + (channel >> 3);
if (channel2 < channel) channel2 = ~0;
*(pb++) = channel2;
}
}
}
}
}
}; // end namespace FbTk
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