mirror of
https://github.com/kasmtech/KasmVNC.git
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374 lines
9.9 KiB
C++
374 lines
9.9 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright 2014 Pierre Ossman for Cendio AB
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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// -=- PixelBuffer.cxx
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//
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// The PixelBuffer class encapsulates the PixelFormat and dimensions
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// of a block of pixel data.
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#include <rfb/Exception.h>
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#include <rfb/LogWriter.h>
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#include <rfb/PixelBuffer.h>
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using namespace rfb;
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using namespace rdr;
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static LogWriter vlog("PixelBuffer");
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// -=- Generic pixel buffer class
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PixelBuffer::PixelBuffer(const PixelFormat& pf, int w, int h)
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: format(pf), width_(w), height_(h) {}
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PixelBuffer::PixelBuffer() : width_(0), height_(0) {}
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PixelBuffer::~PixelBuffer() {}
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void
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PixelBuffer::getImage(void* imageBuf, const Rect& r, int outStride) const
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{
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int inStride;
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const U8* data;
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int bytesPerPixel, inBytesPerRow, outBytesPerRow, bytesPerMemCpy;
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U8* imageBufPos;
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const U8* end;
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Source rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(),
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r.tl.x, r.tl.y, width_, height_);
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data = getBuffer(r, &inStride);
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bytesPerPixel = format.bpp/8;
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inBytesPerRow = inStride * bytesPerPixel;
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if (!outStride)
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outStride = r.width();
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outBytesPerRow = outStride * bytesPerPixel;
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bytesPerMemCpy = r.width() * bytesPerPixel;
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imageBufPos = (U8*)imageBuf;
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end = data + (inBytesPerRow * r.height());
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while (data < end) {
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memcpy(imageBufPos, data, bytesPerMemCpy);
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imageBufPos += outBytesPerRow;
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data += inBytesPerRow;
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}
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}
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void PixelBuffer::getImage(const PixelFormat& pf, void* imageBuf,
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const Rect& r, int stride) const
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{
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const rdr::U8* srcBuffer;
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int srcStride;
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if (format.equal(pf)) {
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getImage(imageBuf, r, stride);
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return;
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}
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Source rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(),
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r.tl.x, r.tl.y, width_, height_);
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if (stride == 0)
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stride = r.width();
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srcBuffer = getBuffer(r, &srcStride);
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pf.bufferFromBuffer((U8*)imageBuf, format, srcBuffer, r.width(), r.height(),
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stride, srcStride);
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}
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// -=- Modifiable generic pixel buffer class
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ModifiablePixelBuffer::ModifiablePixelBuffer(const PixelFormat& pf,
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int w, int h)
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: PixelBuffer(pf, w, h)
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{
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}
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ModifiablePixelBuffer::ModifiablePixelBuffer()
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{
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}
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ModifiablePixelBuffer::~ModifiablePixelBuffer()
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{
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}
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void ModifiablePixelBuffer::fillRect(const Rect& r, const void* pix)
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{
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int stride;
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U8 *buf;
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int w, h, b;
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Destination rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(), r.tl.x, r.tl.y, width_, height_);
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w = r.width();
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h = r.height();
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b = format.bpp/8;
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if (h == 0)
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return;
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buf = getBufferRW(r, &stride);
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if (b == 1) {
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while (h--) {
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memset(buf, *(const U8*)pix, w);
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buf += stride * b;
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}
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} else {
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U8 *start;
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int w1;
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start = buf;
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w1 = w;
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while (w1--) {
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memcpy(buf, pix, b);
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buf += b;
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}
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buf += (stride - w) * b;
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h--;
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while (h--) {
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memcpy(buf, start, w * b);
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buf += stride * b;
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}
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}
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commitBufferRW(r);
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}
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void ModifiablePixelBuffer::imageRect(const Rect& r,
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const void* pixels, int srcStride)
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{
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U8* dest;
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int destStride;
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int bytesPerPixel, bytesPerDestRow, bytesPerSrcRow, bytesPerFill;
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const U8* src;
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U8* end;
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Destination rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(),
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r.tl.x, r.tl.y, width_, height_);
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bytesPerPixel = getPF().bpp/8;
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dest = getBufferRW(r, &destStride);
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bytesPerDestRow = bytesPerPixel * destStride;
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if (!srcStride)
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srcStride = r.width();
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bytesPerSrcRow = bytesPerPixel * srcStride;
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bytesPerFill = bytesPerPixel * r.width();
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src = (const U8*)pixels;
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end = dest + (bytesPerDestRow * r.height());
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while (dest < end) {
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memcpy(dest, src, bytesPerFill);
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dest += bytesPerDestRow;
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src += bytesPerSrcRow;
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}
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commitBufferRW(r);
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}
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void ModifiablePixelBuffer::copyRect(const Rect &rect,
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const Point &move_by_delta)
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{
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int srcStride, dstStride;
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int bytesPerPixel;
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const U8* srcData;
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U8* dstData;
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Rect drect, srect;
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drect = rect;
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if (!drect.enclosed_by(getRect()))
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throw rfb::Exception("Destination rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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drect.width(), drect.height(),
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drect.tl.x, drect.tl.y, width_, height_);
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srect = drect.translate(move_by_delta.negate());
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if (!srect.enclosed_by(getRect()))
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throw rfb::Exception("Source rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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srect.width(), srect.height(),
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srect.tl.x, srect.tl.y, width_, height_);
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bytesPerPixel = format.bpp/8;
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srcData = getBuffer(srect, &srcStride);
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dstData = getBufferRW(drect, &dstStride);
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if (move_by_delta.y == 0) {
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// Possible overlap. Be careful and use memmove().
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int h = drect.height();
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while (h--) {
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memmove(dstData, srcData, drect.width() * bytesPerPixel);
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dstData += dstStride * bytesPerPixel;
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srcData += srcStride * bytesPerPixel;
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}
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} else if (move_by_delta.y < 0) {
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// The data shifted upwards. Copy from top to bottom.
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int h = drect.height();
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while (h--) {
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memcpy(dstData, srcData, drect.width() * bytesPerPixel);
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dstData += dstStride * bytesPerPixel;
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srcData += srcStride * bytesPerPixel;
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}
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} else {
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// The data shifted downwards. Copy from bottom to top.
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int h = drect.height();
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dstData += (h-1) * dstStride * bytesPerPixel;
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srcData += (h-1) * srcStride * bytesPerPixel;
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while (h--) {
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memcpy(dstData, srcData, drect.width() * bytesPerPixel);
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dstData -= dstStride * bytesPerPixel;
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srcData -= srcStride * bytesPerPixel;
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}
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}
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commitBufferRW(drect);
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}
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void ModifiablePixelBuffer::fillRect(const PixelFormat& pf, const Rect &dest,
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const void* pix)
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{
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rdr::U8 buf[4];
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format.bufferFromBuffer(buf, pf, (const rdr::U8*)pix, 1);
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fillRect(dest, buf);
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}
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void ModifiablePixelBuffer::imageRect(const PixelFormat& pf, const Rect &dest,
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const void* pixels, int stride)
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{
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rdr::U8* dstBuffer;
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int dstStride;
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if (!dest.enclosed_by(getRect()))
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throw rfb::Exception("Destination rect %dx%d at %d,%d exceeds framebuffer %dx%d",
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dest.width(), dest.height(),
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dest.tl.x, dest.tl.y, width_, height_);
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if (stride == 0)
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stride = dest.width();
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dstBuffer = getBufferRW(dest, &dstStride);
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format.bufferFromBuffer(dstBuffer, pf, (const rdr::U8*)pixels,
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dest.width(), dest.height(),
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dstStride, stride);
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commitBufferRW(dest);
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}
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// -=- Simple pixel buffer with a continuous block of memory
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FullFramePixelBuffer::FullFramePixelBuffer(const PixelFormat& pf, int w, int h,
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rdr::U8* data_, int stride_)
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: ModifiablePixelBuffer(pf, w, h), data(data_), stride(stride_)
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{
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}
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FullFramePixelBuffer::FullFramePixelBuffer() : data(0) {}
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FullFramePixelBuffer::~FullFramePixelBuffer() {}
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rdr::U8* FullFramePixelBuffer::getBufferRW(const Rect& r, int* stride_)
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{
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Pixel buffer request %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(),
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r.tl.x, r.tl.y, width_, height_);
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*stride_ = stride;
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return &data[(r.tl.x + (r.tl.y * stride)) * (format.bpp/8)];
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}
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void FullFramePixelBuffer::commitBufferRW(const Rect& r)
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{
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}
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const rdr::U8* FullFramePixelBuffer::getBuffer(const Rect& r, int* stride_) const
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{
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if (!r.enclosed_by(getRect()))
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throw rfb::Exception("Pixel buffer request %dx%d at %d,%d exceeds framebuffer %dx%d",
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r.width(), r.height(),
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r.tl.x, r.tl.y, width_, height_);
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*stride_ = stride;
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return &data[(r.tl.x + (r.tl.y * stride)) * (format.bpp/8)];
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}
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// -=- Managed pixel buffer class
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// Automatically allocates enough space for the specified format & area
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ManagedPixelBuffer::ManagedPixelBuffer()
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: datasize(0)
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{
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checkDataSize();
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};
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ManagedPixelBuffer::ManagedPixelBuffer(const PixelFormat& pf, int w, int h)
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: FullFramePixelBuffer(pf, w, h, NULL, w), datasize(0)
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{
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checkDataSize();
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};
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ManagedPixelBuffer::~ManagedPixelBuffer() {
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if (data) delete [] data;
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};
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void
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ManagedPixelBuffer::setPF(const PixelFormat &pf) {
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format = pf; checkDataSize();
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};
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void
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ManagedPixelBuffer::setSize(int w, int h) {
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width_ = w; height_ = h; stride = w; checkDataSize();
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};
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inline void
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ManagedPixelBuffer::checkDataSize() {
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unsigned long new_datasize = width_ * height_ * (format.bpp/8);
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if (datasize < new_datasize) {
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if (data) {
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delete [] data;
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datasize = 0; data = 0;
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}
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if (new_datasize) {
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data = new U8[new_datasize];
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if (!data)
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throw Exception("rfb::ManagedPixelBuffer unable to allocate buffer");
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datasize = new_datasize;
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}
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}
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};
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