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struct VideoGDI : Video {
VideoGDI() { initialize(); }
~VideoGDI() { terminate(); }
auto ready() -> bool { return _ready; }
auto context() -> uintptr { return _context; }
auto setContext(uintptr context) -> bool {
if(_context == context) return true;
_context = context;
return initialize();
}
auto clear() -> void {
if(!ready()) return;
}
auto lock(uint32_t*& data, uint& pitch, uint width, uint height) -> bool {
if(!ready()) return false;
if(!_buffer || _width != width || _height != height) {
if(_buffer) delete[] _buffer;
if(_bitmap) DeleteObject(_bitmap);
if(_dc) DeleteObject(_dc);
_buffer = new uint32_t[width * height]();
_width = width;
_height = height;
HDC hdc = GetDC((HWND)_context);
_dc = CreateCompatibleDC(hdc);
_bitmap = CreateCompatibleBitmap(hdc, width, height);
SelectObject(_dc, _bitmap);
ReleaseDC((HWND)_context, hdc);
memory::fill(&_info, sizeof(BITMAPINFO));
_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
_info.bmiHeader.biWidth = width;
_info.bmiHeader.biHeight = -height;
_info.bmiHeader.biPlanes = 1;
_info.bmiHeader.biBitCount = 32;
_info.bmiHeader.biCompression = BI_RGB;
_info.bmiHeader.biSizeImage = width * height * sizeof(uint32_t);
}
pitch = _width * sizeof(uint32_t);
return data = _buffer;
}
auto unlock() -> void {
if(!ready()) return;
}
auto output() -> void {
if(!ready()) return;
RECT rc;
GetClientRect((HWND)_context, &rc);
SetDIBits(_dc, _bitmap, 0, _height, (void*)_buffer, &_info, DIB_RGB_COLORS);
HDC hdc = GetDC((HWND)_context);
StretchBlt(hdc, rc.left, rc.top, rc.right, rc.bottom, _dc, 0, 0, _width, _height, SRCCOPY);
ReleaseDC((HWND)_context, hdc);
}
private:
auto initialize() -> bool {
terminate();
if(!_context) return false;
_width = 0;
_height = 0;
return _ready = true;
}
auto terminate() -> void {
_ready = false;
if(_buffer) { delete[] _buffer; _buffer = nullptr; }
if(_bitmap) { DeleteObject(_bitmap); _bitmap = nullptr; }
if(_dc) { DeleteDC(_dc); _dc = nullptr; }
}
bool _ready = false;
uintptr _context = 0;
uint32_t* _buffer = nullptr;
uint _width = 0;
uint _height = 0;
HBITMAP _bitmap = nullptr;
HDC _dc = nullptr;
BITMAPINFO _info = {};
};
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