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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2014 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");
void Cursor::setSize(int w, int h) {
int oldMaskLen = maskLen();
ManagedPixelBuffer::setSize(w, h);
if (maskLen() > oldMaskLen) {
delete [] mask.buf;
mask.buf = new rdr::U8[maskLen()];
}
}
void Cursor::drawOutline(const Pixel& c)
{
Cursor outlined;
// Create a mirror of the existing cursor
outlined.setPF(getPF());
outlined.setSize(width(), height());
outlined.hotspot = hotspot;
// Clear the mirror's background to the outline colour
outlined.fillRect(getRect(), c);
// Blit the existing cursor, using its mask
outlined.maskRect(getRect(), data, mask.buf);
// Now just adjust the mask to add the outline. The outline pixels
// will already be the right colour. :)
int maskBytesPerRow = (width() + 7) / 8;
for (int y = 0; y < height(); y++) {
for (int byte=0; byte<maskBytesPerRow; byte++) {
rdr::U8 m8 = mask.buf[y*maskBytesPerRow + byte];
// Handle above & below outline
if (y > 0) m8 |= mask.buf[(y-1)*maskBytesPerRow + byte];
if (y < height()-1) m8 |= mask.buf[(y+1)*maskBytesPerRow + byte];
// Left outline
m8 |= mask.buf[y*maskBytesPerRow + byte] << 1;
if (byte < maskBytesPerRow-1)
m8 |= (mask.buf[y*maskBytesPerRow + byte + 1] >> 7) & 1;
// Right outline
m8 |= mask.buf[y*maskBytesPerRow + byte] >> 1;
if (byte > 0)
m8 |= (mask.buf[y*maskBytesPerRow + byte - 1] << 7) & 128;
outlined.mask.buf[y*maskBytesPerRow + byte] = m8;
}
}
// Replace the existing cursor & mask with the new one
delete [] data;
delete [] mask.buf;
data = outlined.data; outlined.data = 0;
mask.buf = outlined.mask.buf; outlined.mask.buf = 0;
}
rdr::U8* Cursor::getBitmap(Pixel* pix0, Pixel* pix1) const
{
bool gotPix0 = false;
bool gotPix1 = false;
*pix0 = *pix1 = 0;
rdr::U8Array source(maskLen());
memset(source.buf, 0, maskLen());
int maskBytesPerRow = (width() + 7) / 8;
const rdr::U8 *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 (mask.buf[byte] & (1 << bit)) {
Pixel pix = getPF().pixelFromBuffer(data_ptr);
if (!gotPix0 || pix == *pix0) {
gotPix0 = true;
*pix0 = pix;
} else if (!gotPix1 || pix == *pix1) {
gotPix1 = true;
*pix1 = pix;
source.buf[byte] |= (1 << bit);
} else {
// not a bitmap
return 0;
}
}
data_ptr += getPF().bpp/8;
}
}
return source.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 = getRect().intersect(Rect(hotspot.x, hotspot.y,
hotspot.x+1, hotspot.y+1));
int maskBytesPerRow = (width() + 7) / 8;
int x, y;
for (y = 0; y < height(); y++) {
for (x = 0; x < width(); x++) {
int byte = y * maskBytesPerRow + x / 8;
int bit = 7 - x % 8;
if (mask.buf[byte] & (1 << bit)) {
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;
}
}
}
if (width() == busy.width() && height() == busy.height()) return;
vlog.debug("cropping %dx%d to %dx%d", width(), height(),
busy.width(), busy.height());
// Copy the pixel data
int newDataLen = busy.area() * (getPF().bpp/8);
rdr::U8* newData = new rdr::U8[newDataLen];
getImage(newData, busy);
// Copy the mask
int newMaskBytesPerRow = (busy.width()+7)/8;
int newMaskLen = newMaskBytesPerRow * busy.height();
rdr::U8* newMask = new rdr::U8[newMaskLen];
memset(newMask, 0, newMaskLen);
for (y = 0; y < busy.height(); y++) {
int newByte, newBit;
for (x = 0; x < busy.width(); x++) {
int oldByte = (y+busy.tl.y) * maskBytesPerRow + (x+busy.tl.x) / 8;
int oldBit = 7 - (x+busy.tl.x) % 8;
newByte = y * newMaskBytesPerRow + x / 8;
newBit = 7 - x % 8;
if (mask.buf[oldByte] & (1 << oldBit))
newMask[newByte] |= (1 << newBit);
}
}
// Set the size and data to the new, cropped cursor.
setSize(busy.width(), busy.height());
hotspot = hotspot.subtract(busy.tl);
delete [] data;
delete [] mask.buf;
datasize = newDataLen;
data = newData;
mask.buf = newMask;
}
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;
Rect clippedRect;
const rdr::U8* data;
int stride;
assert(framebuffer);
assert(cursor);
if (!framebuffer->getPF().equal(cursor->getPF()))
throw Exception("RenderedCursor: Trying to render cursor on incompatible frame buffer");
format = framebuffer->getPF();
width_ = framebuffer->width();
height_ = framebuffer->height();
rawOffset = pos.subtract(cursor->hotspot);
clippedRect = cursor->getRect(rawOffset).intersect(framebuffer->getRect());
offset = clippedRect.tl;
buffer.setPF(cursor->getPF());
buffer.setSize(clippedRect.width(), clippedRect.height());
data = framebuffer->getBuffer(buffer.getRect(offset), &stride);
buffer.imageRect(buffer.getRect(), data, stride);
data = cursor->getBuffer(cursor->getRect(), &stride);
buffer.maskRect(cursor->getRect(rawOffset.subtract(offset)),
data, cursor->mask.buf);
}
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