mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-12-25 16:18:53 +01:00
323 lines
8.7 KiB
C++
323 lines
8.7 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
|
|
* Copyright 2014-2017 Pierre Ossman for Cendio AB
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This software 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this software; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
* USA.
|
|
*/
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <rfb/Cursor.h>
|
|
#include <rfb/LogWriter.h>
|
|
#include <rfb/Exception.h>
|
|
|
|
using namespace rfb;
|
|
|
|
static LogWriter vlog("Cursor");
|
|
|
|
Cursor::Cursor(int width, int height, const Point& hotspot,
|
|
const rdr::U8* data) :
|
|
width_(width), height_(height), hotspot_(hotspot)
|
|
{
|
|
this->data = new rdr::U8[width_*height_*4];
|
|
memcpy(this->data, data, width_*height_*4);
|
|
}
|
|
|
|
Cursor::Cursor(const Cursor& other) :
|
|
width_(other.width_), height_(other.height_),
|
|
hotspot_(other.hotspot_)
|
|
{
|
|
data = new rdr::U8[width_*height_*4];
|
|
memcpy(data, other.data, width_*height_*4);
|
|
}
|
|
|
|
Cursor::~Cursor()
|
|
{
|
|
delete [] data;
|
|
}
|
|
|
|
static unsigned short pow223[] = { 0, 30, 143, 355, 676, 1113, 1673,
|
|
2361, 3181, 4139, 5237, 6479, 7869,
|
|
9409, 11103, 12952, 14961, 17130,
|
|
19462, 21960, 24626, 27461, 30467,
|
|
33647, 37003, 40535, 44245, 48136,
|
|
52209, 56466, 60907, 65535 };
|
|
|
|
static unsigned short ipow(unsigned short val, unsigned short lut[])
|
|
{
|
|
int idx = val >> (16-5);
|
|
int a, b;
|
|
|
|
if (val < 0x8000) {
|
|
a = lut[idx];
|
|
b = lut[idx+1];
|
|
} else {
|
|
a = lut[idx-1];
|
|
b = lut[idx];
|
|
}
|
|
|
|
return (val & 0x7ff) * (b-a) / 0x7ff + a;
|
|
}
|
|
|
|
static unsigned short srgb_to_lin(unsigned char srgb)
|
|
{
|
|
return ipow((unsigned)srgb * 65535 / 255, pow223);
|
|
}
|
|
|
|
// Floyd-Steinberg dithering
|
|
static void dither(int width, int height, int* data)
|
|
{
|
|
for (int y = 0; y < height; y++) {
|
|
for (int x_ = 0; x_ < width; x_++) {
|
|
int x = (y & 1) ? (width - x_ - 1) : x_;
|
|
int error;
|
|
|
|
if (data[x] > 32767) {
|
|
error = data[x] - 65535;
|
|
data[x] = 65535;
|
|
} else {
|
|
error = data[x] - 0;
|
|
data[x] = 0;
|
|
}
|
|
|
|
if (y & 1) {
|
|
if (x > 0) {
|
|
data[x - 1] += error * 7 / 16;
|
|
}
|
|
if ((y + 1) < height) {
|
|
if (x > 0)
|
|
data[x - 1 + width] += error * 3 / 16;
|
|
data[x + width] += error * 5 / 16;
|
|
if ((x + 1) < width)
|
|
data[x + 1] += error * 1 / 16;
|
|
}
|
|
} else {
|
|
if ((x + 1) < width) {
|
|
data[x + 1] += error * 7 / 16;
|
|
}
|
|
if ((y + 1) < height) {
|
|
if ((x + 1) < width)
|
|
data[x + 1 + width] += error * 3 / 16;
|
|
data[x + width] += error * 5 / 16;
|
|
if (x > 0)
|
|
data[x - 1] += error * 1 / 16;
|
|
}
|
|
}
|
|
}
|
|
data += width;
|
|
}
|
|
}
|
|
|
|
rdr::U8* Cursor::getBitmap() const
|
|
{
|
|
// First step is converting to luminance
|
|
int luminance[width()*height()];
|
|
int *lum_ptr = luminance;
|
|
const rdr::U8 *data_ptr = data;
|
|
for (int y = 0; y < height(); y++) {
|
|
for (int x = 0; x < width(); x++) {
|
|
// Use BT.709 coefficients for grayscale
|
|
*lum_ptr = 0;
|
|
*lum_ptr += (int)srgb_to_lin(data_ptr[0]) * 6947; // 0.2126
|
|
*lum_ptr += (int)srgb_to_lin(data_ptr[1]) * 23436; // 0.7152
|
|
*lum_ptr += (int)srgb_to_lin(data_ptr[2]) * 2366; // 0.0722
|
|
*lum_ptr /= 32768;
|
|
|
|
lum_ptr++;
|
|
data_ptr += 4;
|
|
}
|
|
}
|
|
|
|
// Then diterhing
|
|
dither(width(), height(), luminance);
|
|
|
|
// Then conversion to a bit mask
|
|
rdr::U8Array source((width()+7)/8*height());
|
|
memset(source.buf, 0, (width()+7)/8*height());
|
|
int maskBytesPerRow = (width() + 7) / 8;
|
|
lum_ptr = luminance;
|
|
data_ptr = data;
|
|
for (int y = 0; y < height(); y++) {
|
|
for (int x = 0; x < width(); x++) {
|
|
int byte = y * maskBytesPerRow + x / 8;
|
|
int bit = 7 - x % 8;
|
|
if (*lum_ptr > 32767)
|
|
source.buf[byte] |= (1 << bit);
|
|
lum_ptr++;
|
|
data_ptr += 4;
|
|
}
|
|
}
|
|
|
|
return source.takeBuf();
|
|
}
|
|
|
|
rdr::U8* Cursor::getMask() const
|
|
{
|
|
// First step is converting to integer array
|
|
int alpha[width()*height()];
|
|
int *alpha_ptr = alpha;
|
|
const rdr::U8 *data_ptr = data;
|
|
for (int y = 0; y < height(); y++) {
|
|
for (int x = 0; x < width(); x++) {
|
|
*alpha_ptr = (int)data_ptr[3] * 65535 / 255;
|
|
alpha_ptr++;
|
|
data_ptr += 4;
|
|
}
|
|
}
|
|
|
|
// Then diterhing
|
|
dither(width(), height(), alpha);
|
|
|
|
// Then conversion to a bit mask
|
|
rdr::U8Array mask((width()+7)/8*height());
|
|
memset(mask.buf, 0, (width()+7)/8*height());
|
|
int maskBytesPerRow = (width() + 7) / 8;
|
|
alpha_ptr = alpha;
|
|
data_ptr = data;
|
|
for (int y = 0; y < height(); y++) {
|
|
for (int x = 0; x < width(); x++) {
|
|
int byte = y * maskBytesPerRow + x / 8;
|
|
int bit = 7 - x % 8;
|
|
if (*alpha_ptr > 32767)
|
|
mask.buf[byte] |= (1 << bit);
|
|
alpha_ptr++;
|
|
data_ptr += 4;
|
|
}
|
|
}
|
|
|
|
return mask.takeBuf();
|
|
}
|
|
|
|
// crop() determines the "busy" rectangle for the cursor - the minimum bounding
|
|
// rectangle containing actual pixels. This isn't the most efficient algorithm
|
|
// but it's short. For sanity, we make sure that the busy rectangle always
|
|
// includes the hotspot (the hotspot is unsigned on the wire so otherwise it
|
|
// would cause problems if it was above or left of the actual pixels)
|
|
|
|
void Cursor::crop()
|
|
{
|
|
Rect busy = Rect(0, 0, width_, height_);
|
|
busy = busy.intersect(Rect(hotspot_.x, hotspot_.y,
|
|
hotspot_.x+1, hotspot_.y+1));
|
|
int x, y;
|
|
rdr::U8 *data_ptr = data;
|
|
for (y = 0; y < height(); y++) {
|
|
for (x = 0; x < width(); x++) {
|
|
if (data_ptr[3] > 0) {
|
|
if (x < busy.tl.x) busy.tl.x = x;
|
|
if (x+1 > busy.br.x) busy.br.x = x+1;
|
|
if (y < busy.tl.y) busy.tl.y = y;
|
|
if (y+1 > busy.br.y) busy.br.y = y+1;
|
|
}
|
|
data_ptr += 4;
|
|
}
|
|
}
|
|
|
|
if (width() == busy.width() && height() == busy.height()) return;
|
|
|
|
// Copy the pixel data
|
|
int newDataLen = busy.area() * 4;
|
|
rdr::U8* newData = new rdr::U8[newDataLen];
|
|
data_ptr = newData;
|
|
for (y = busy.tl.y; y < busy.br.y; y++) {
|
|
memcpy(data_ptr, data + y*width()*4 + busy.tl.x*4, busy.width()*4);
|
|
data_ptr += busy.width()*4;
|
|
}
|
|
|
|
// Set the size and data to the new, cropped cursor.
|
|
width_ = busy.width();
|
|
height_ = busy.height();
|
|
hotspot_ = hotspot_.subtract(busy.tl);
|
|
delete [] data;
|
|
data = newData;
|
|
}
|
|
|
|
RenderedCursor::RenderedCursor()
|
|
{
|
|
}
|
|
|
|
const rdr::U8* RenderedCursor::getBuffer(const Rect& _r, int* stride) const
|
|
{
|
|
Rect r;
|
|
|
|
r = _r.translate(offset.negate());
|
|
if (!r.enclosed_by(buffer.getRect()))
|
|
throw Exception("RenderedCursor: Invalid area requested");
|
|
|
|
return buffer.getBuffer(r, stride);
|
|
}
|
|
|
|
void RenderedCursor::update(PixelBuffer* framebuffer,
|
|
Cursor* cursor, const Point& pos)
|
|
{
|
|
Point rawOffset, diff;
|
|
Rect clippedRect;
|
|
|
|
const rdr::U8* data;
|
|
int stride;
|
|
|
|
assert(framebuffer);
|
|
assert(cursor);
|
|
|
|
format = framebuffer->getPF();
|
|
width_ = framebuffer->width();
|
|
height_ = framebuffer->height();
|
|
|
|
rawOffset = pos.subtract(cursor->hotspot());
|
|
clippedRect = Rect(0, 0, cursor->width(), cursor->height())
|
|
.translate(rawOffset)
|
|
.intersect(framebuffer->getRect());
|
|
offset = clippedRect.tl;
|
|
|
|
buffer.setPF(format);
|
|
buffer.setSize(clippedRect.width(), clippedRect.height());
|
|
|
|
// Bail out early to avoid pestering the framebuffer with
|
|
// bogus coordinates
|
|
if (clippedRect.area() == 0)
|
|
return;
|
|
|
|
data = framebuffer->getBuffer(buffer.getRect(offset), &stride);
|
|
buffer.imageRect(buffer.getRect(), data, stride);
|
|
|
|
diff = offset.subtract(rawOffset);
|
|
for (int y = 0;y < buffer.height();y++) {
|
|
for (int x = 0;x < buffer.width();x++) {
|
|
size_t idx;
|
|
rdr::U8 bg[4], fg[4];
|
|
rdr::U8 rgb[3];
|
|
|
|
idx = (y+diff.y)*cursor->width() + (x+diff.x);
|
|
memcpy(fg, cursor->getBuffer() + idx*4, 4);
|
|
|
|
if (fg[3] == 0x00)
|
|
continue;
|
|
else if (fg[3] == 0xff) {
|
|
memcpy(rgb, fg, 3);
|
|
} else {
|
|
buffer.getImage(bg, Rect(x, y, x+1, y+1));
|
|
format.rgbFromBuffer(rgb, bg, 1);
|
|
// FIXME: Gamma aware blending
|
|
for (int i = 0;i < 3;i++) {
|
|
rgb[i] = (unsigned)rgb[i]*(255-fg[3])/255 +
|
|
(unsigned)fg[i]*fg[3]/255;
|
|
}
|
|
}
|
|
|
|
format.bufferFromRGB(bg, rgb, 1);
|
|
buffer.imageRect(Rect(x, y, x+1, y+1), bg);
|
|
}
|
|
}
|
|
}
|