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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 <rfb_win32/DeviceContext.h>
#include <rfb_win32/CompatibleBitmap.h>
#include <rfb_win32/BitmapInfo.h>
#include <rdr/Exception.h>
#include <rfb/LogWriter.h>
using namespace rfb;
using namespace win32;
static LogWriter vlog("DeviceContext");
PixelFormat DeviceContext::getPF() const {
return getPF(dc);
}
PixelFormat DeviceContext::getPF(HDC dc) {
bool trueColour, bigEndian;
int bpp, depth;
int redMax, greenMax, blueMax;
int redShift, greenShift, blueShift;
CompatibleBitmap bitmap(dc, 1, 1);
// -=- Get the bitmap format information
BitmapInfo bi;
memset(&bi, 0, sizeof(bi));
bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bi.bmiHeader.biBitCount = 0;
if (!::GetDIBits(dc, bitmap, 0, 1, NULL, (BITMAPINFO*)&bi, DIB_RGB_COLORS)) {
throw rdr::SystemException("unable to determine device pixel format", GetLastError());
}
if (!::GetDIBits(dc, bitmap, 0, 1, NULL, (BITMAPINFO*)&bi, DIB_RGB_COLORS)) {
throw rdr::SystemException("unable to determine pixel shifts/palette", GetLastError());
}
// Set the initial format information
trueColour = bi.bmiHeader.biBitCount > 8;
bigEndian = 0;
bpp = bi.bmiHeader.biBitCount;
if (trueColour) {
DWORD rMask=0, gMask=0, bMask=0;
// Which true colour format is the DIB section using?
switch (bi.bmiHeader.biCompression) {
case BI_RGB:
// Default RGB layout
switch (bi.bmiHeader.biBitCount) {
case 16:
// RGB 555 - High Colour
vlog.info("16-bit High Colour");
rMask = 0x7c00;
bMask = 0x001f;
gMask = 0x03e0;
break;
case 24:
case 32:
// RGB 888 - True Colour
vlog.info("24/32-bit High Colour");
rMask = 0xff0000;
gMask = 0x00ff00;
bMask = 0x0000ff;
break;
default:
vlog.error("bits per pixel %u not supported", bi.bmiHeader.biBitCount);
throw rdr::Exception("unknown bits per pixel specified");
};
break;
case BI_BITFIELDS:
// Custom RGB layout
rMask = bi.mask.red;
gMask = bi.mask.green;
bMask = bi.mask.blue;
vlog.info("%lu-bit BitFields: (%lx, %lx, %lx)",
bi.bmiHeader.biBitCount, rMask, gMask, bMask);
break;
};
// Convert the data we just retrieved
initMaxAndShift(rMask, &redMax, &redShift);
initMaxAndShift(gMask, &greenMax, &greenShift);
initMaxAndShift(bMask, &blueMax, &blueShift);
// Calculate the depth from the colour shifts
depth = 0;
Pixel bits = rMask | gMask | bMask;
while (bits) {
depth++;
bits = bits >> 1;
}
// Check that the depth & bpp are valid
if (depth > bpp) {
vlog.error("depth exceeds bits per pixel!");
bpp = depth;
}
// Correct the bits-per-pixel to something we're happy with
if (bpp <= 16)
bpp = 16;
else if (bpp <= 32)
bpp = 32;
} else {
// Palettised format - depth reflects number of colours,
// but bits-per-pixel is ALWAYS 8
depth = bpp;
if (bpp < 8)
bpp = 8;
vlog.info("%d-colour palettised", 1<<depth);
}
return PixelFormat(bpp, depth, bigEndian, trueColour,
redMax, greenMax, blueMax,
redShift, greenShift, blueShift);
}
Rect DeviceContext::getClipBox() const {
return getClipBox(dc);
}
Rect DeviceContext::getClipBox(HDC dc) {
// Get the display dimensions
RECT cr;
if (!GetClipBox(dc, &cr))
throw rdr::SystemException("GetClipBox", GetLastError());
return Rect(cr.left, cr.top, cr.right, cr.bottom);
}
DeviceDC::DeviceDC(const TCHAR* deviceName) {
dc = ::CreateDC(_T("DISPLAY"), deviceName, NULL, NULL);
if (!dc)
throw rdr::SystemException("failed to create DeviceDC", GetLastError());
}
DeviceDC::~DeviceDC() {
if (dc)
DeleteDC(dc);
}
WindowDC::WindowDC(HWND wnd) : hwnd(wnd) {
dc = GetDC(wnd);
if (!dc)
throw rdr::SystemException("GetDC failed", GetLastError());
}
WindowDC::~WindowDC() {
if (dc)
ReleaseDC(hwnd, dc);
}
CompatibleDC::CompatibleDC(HDC existing) {
dc = CreateCompatibleDC(existing);
if (!dc)
throw rdr::SystemException("CreateCompatibleDC failed", GetLastError());
}
CompatibleDC::~CompatibleDC() {
if (dc)
DeleteDC(dc);
}
BitmapDC::BitmapDC(HDC hdc, HBITMAP hbitmap) : CompatibleDC(hdc){
oldBitmap = (HBITMAP)SelectObject(dc, hbitmap);
if (!oldBitmap)
throw rdr::SystemException("SelectObject to CompatibleDC failed",
GetLastError());
}
BitmapDC::~BitmapDC() {
SelectObject(dc, oldBitmap);
}
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