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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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <rfb_win32/DIBSectionBuffer.h>
#include <rfb_win32/DeviceContext.h>
#include <rfb_win32/BitmapInfo.h>
#include <rfb/LogWriter.h>
using namespace rfb;
using namespace win32;
static LogWriter vlog("DIBSectionBuffer");
DIBSectionBuffer::DIBSectionBuffer(HWND window_)
: bitmap(nullptr), window(window_), device(nullptr) {
}
DIBSectionBuffer::DIBSectionBuffer(HDC device_)
: bitmap(nullptr), window(nullptr), device(device_) {
}
DIBSectionBuffer::~DIBSectionBuffer() {
if (bitmap)
DeleteObject(bitmap);
}
inline void initMaxAndShift(DWORD mask, int* max, int* shift) {
for ((*shift) = 0; (mask & 1) == 0; (*shift)++) mask >>= 1;
(*max) = (uint16_t)mask;
}
void DIBSectionBuffer::initBuffer(const PixelFormat& pf, int w, int h) {
HBITMAP new_bitmap = nullptr;
uint8_t* new_data = nullptr;
if (!pf.trueColour)
throw rfb::Exception("palette format not supported");
format = pf;
if (w && h && (format.depth != 0)) {
BitmapInfo bi;
memset(&bi, 0, sizeof(bi));
UINT iUsage = DIB_RGB_COLORS;
bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bi.bmiHeader.biBitCount = format.bpp;
bi.bmiHeader.biSizeImage = (format.bpp / 8) * w * h;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biWidth = w;
bi.bmiHeader.biHeight = -h;
bi.bmiHeader.biCompression = (format.bpp > 8) ? BI_BITFIELDS : BI_RGB;
bi.mask.red = format.pixelFromRGB((uint16_t)~0, 0, 0);
bi.mask.green = format.pixelFromRGB(0, (uint16_t)~0, 0);
bi.mask.blue = format.pixelFromRGB(0, 0, (uint16_t)~0);
// Create a DIBSection to draw into
if (device)
new_bitmap = ::CreateDIBSection(device, (BITMAPINFO*)&bi.bmiHeader, iUsage,
(void**)&new_data, nullptr, 0);
else
new_bitmap = ::CreateDIBSection(WindowDC(window), (BITMAPINFO*)&bi.bmiHeader, iUsage,
(void**)&new_data, nullptr, 0);
if (!new_bitmap) {
int err = GetLastError();
throw rdr::Win32Exception("unable to create DIB section", err);
}
vlog.debug("recreateBuffer()");
} else {
vlog.debug("one of area or format not set");
}
if (new_bitmap && bitmap) {
vlog.debug("preserving bitmap contents");
// Copy the contents across
if (device) {
BitmapDC src_dev(device, bitmap);
BitmapDC dest_dev(device, new_bitmap);
BitBlt(dest_dev, 0, 0, w, h, src_dev, 0, 0, SRCCOPY);
} else {
WindowDC wndDC(window);
BitmapDC src_dev(wndDC, bitmap);
BitmapDC dest_dev(wndDC, new_bitmap);
BitBlt(dest_dev, 0, 0, w, h, src_dev, 0, 0, SRCCOPY);
}
}
if (bitmap) {
// Delete the old bitmap
DeleteObject(bitmap);
bitmap = nullptr;
setBuffer(0, 0, nullptr, 0);
}
if (new_bitmap) {
int bpp, depth;
int redMax, greenMax, blueMax;
int redShift, greenShift, blueShift;
int new_stride;
// Set up the new bitmap
bitmap = new_bitmap;
// Determine the *actual* DIBSection format
DIBSECTION ds;
if (!GetObject(bitmap, sizeof(ds), &ds))
throw rdr::Win32Exception("GetObject", GetLastError());
// Correct the "stride" of the DIB
// *** This code DWORD aligns each row - is that right???
new_stride = w;
int bytesPerRow = new_stride * format.bpp/8;
if (bytesPerRow % 4) {
bytesPerRow += 4 - (bytesPerRow % 4);
new_stride = (bytesPerRow * 8) / format.bpp;
vlog.info("adjusting DIB stride: %d to %d", w, new_stride);
}
setBuffer(w, h, new_data, new_stride);
// Calculate the PixelFormat for the DIB
bpp = depth = ds.dsBm.bmBitsPixel;
// Get the truecolour format used by the DIBSection
initMaxAndShift(ds.dsBitfields[0], &redMax, &redShift);
initMaxAndShift(ds.dsBitfields[1], &greenMax, &greenShift);
initMaxAndShift(ds.dsBitfields[2], &blueMax, &blueShift);
// Calculate the effective depth
depth = 0;
Pixel bits = ds.dsBitfields[0] | ds.dsBitfields[1] | ds.dsBitfields[2];
while (bits) {
depth++;
bits = bits >> 1;
}
if (depth > bpp)
throw Exception("Bad DIBSection format (depth exceeds bpp)");
format = PixelFormat(bpp, depth, false, true,
redMax, greenMax, blueMax,
redShift, greenShift, blueShift);
}
}
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