https://github.com/sakura-editor/sakura/pull/765

FillRect_speed_test.cpp

#include <Windows.h>
#include <stdio.h>
#include <algorithm>

struct CStopWatch final
{
	const char* title;
	const char* type;
	LARGE_INTEGER frequency;
	LARGE_INTEGER startTime;

	CStopWatch( const char* pszTitle, const char* pszType )
		: title( pszTitle ), type( pszType )
	{
		::QueryPerformanceFrequency( &frequency );
		::QueryPerformanceCounter( &startTime );
	}
	~CStopWatch( void )
	{
		LARGE_INTEGER endTime;
		::QueryPerformanceCounter( &endTime );
		double elapsedSec = 1000 * (endTime.QuadPart - startTime.QuadPart) / (double)frequency.QuadPart;
		char buf[128];
		::sprintf_s( buf, "%.3f msec, %s, %s\n", elapsedSec, title, type );
		::OutputDebugStringA( buf );
	}
};

constexpr size_t MAX_COUNT = 60;

void case_FillRect(HDC hDC, const RECT& rc, const char* pszType)
{
	CStopWatch sw( __FUNCTION__, pszType );
	for ( size_t n = 0; n < MAX_COUNT; n++ ) {
		COLORREF color = RGB(n, n, n);
		HBRUSH brush = ::CreateSolidBrush( color );
		::FillRect( hDC, &rc, brush );
		::DeleteObject( brush );
	}
}

void case_ExtTextOut(HDC hDC, const RECT& rc, const char* pszType)
{
	CStopWatch sw( __FUNCTION__, pszType );
	for ( size_t n = 0; n < MAX_COUNT; n++ ) {
		COLORREF color = RGB(n, n, n);
		COLORREF bkColorOld = ::SetBkColor( hDC, color );
		::ExtTextOutW( hDC, rc.left, rc.top, ETO_OPAQUE, &rc, L"", 0, NULL );
		::SetBkColor( hDC, bkColorOld );
	}
}

void case_PatBlt(HDC hDC, const RECT& rc, const char* pszType)
{
	CStopWatch sw( __FUNCTION__, pszType );
	for ( size_t n = 0; n < MAX_COUNT; n++ ) {
		COLORREF color = RGB(n, n, n);
		HBRUSH brush = ::CreateSolidBrush( color );
		HGDIOBJ brushOld = ::SelectObject( hDC, brush );
		::PatBlt( hDC, rc.left, rc.top, rc.right, rc.bottom, PATCOPY );
		::SelectObject( hDC, brushOld );
		::DeleteObject( brush );
	}
}

static void FillRect_DIB(DWORD* pDIBPixels, RECT rc, int cx, int cy, COLORREF color)
{
	LONG width = rc.right - rc.left;
	LONG height = rc.bottom - rc.top;

	if (rc.top < 0)
	{
		height += rc.top;
		rc.top = 0;
	}
	if (rc.left < 0)
	{
		width += rc.left;
		rc.left = 0;
	}
	if (rc.top >= cy || rc.left >= cx || height < 1 || width < 1)
	{
		return;
	}
	if (rc.left + width > cx)
	{
		width = cx - rc.left;
	}
	if (rc.top + height > cy)
	{
		height = cy - rc.top;
	}

	BYTE r = GetRValue(color);
	BYTE g = GetGValue(color);
	BYTE b = GetBValue(color);
	DWORD dwColor = (r << 16) | (g << 8) | b;

	pDIBPixels += cx * rc.top + rc.left;

	if (width == cx)
	{
		std::fill_n(pDIBPixels, cx * height, dwColor);
	}
	else
	{
		for (LONG i = 0; i < height; ++i)
		{
			std::fill_n(pDIBPixels, width, dwColor);
			pDIBPixels += cx;
		}
	}
}

void case_std_fill(DWORD* pDIBPixels, const RECT& rc, int cx, int cy)
{
	CStopWatch sw( __FUNCTION__, "DIB" );
	for ( size_t n = 0; n < MAX_COUNT; n++ ) {
		COLORREF color = RGB(n, n, n);
		::FillRect_DIB( pDIBPixels, rc, cx, cy, color );
	}
}

//! Main関数
int WINAPI wWinMain(
	HINSTANCE	hInstance,		//!< handle to current instance
	HINSTANCE	hPrevInstance,	//!< handle to previous instance
	LPWSTR		lpCmdLine,		//!< pointer to command line
	int			nCmdShow		//!< show state of window
)
{
	::SetProcessDPIAware();

	HWND hDesktopWnd = ::GetDesktopWindow();
	RECT rc;
	::GetWindowRect( hDesktopWnd, &rc );
	int cx = rc.right - rc.left;
	int cy = rc.bottom - rc.top;

	HDC hDesktopDC = ::GetDC( hDesktopWnd );
	HDC hCompatibleDC_DDB = ::CreateCompatibleDC( NULL );
	HDC hCompatibleDC_DIB = ::CreateCompatibleDC( NULL );
	HBITMAP hDDB = ::CreateBitmap( cx, cy, 3, 32, NULL );
	::SelectObject( hCompatibleDC_DDB, hDDB );

	BITMAPINFO bmi = {0};
	BITMAPINFOHEADER& bmih = bmi.bmiHeader;
	bmih.biSize = sizeof(bmih);
	bmih.biBitCount = 32;
	bmih.biWidth = cx;
	bmih.biHeight = -cy;
	bmih.biPlanes = 1;
	bmih.biCompression = BI_RGB;
	bmih.biSizeImage = 0;
	bmih.biXPelsPerMeter = 0;
	bmih.biYPelsPerMeter = 0;
	bmih.biClrUsed = 0;
	bmih.biClrImportant = 0;
	void* pvBits = nullptr;
	HBITMAP hDIB = CreateDIBSection(
		NULL,
		&bmi,
		DIB_RGB_COLORS,
		&pvBits,
		NULL,
		0
	);
	::SelectObject( hCompatibleDC_DIB, hDIB );

	for (int i = 0; i < 8; ++i)
	{
		char buff[64];
		sprintf_s(buff, "x, y, w, h : %d, %d, %d, %d\n", rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
		::OutputDebugStringA(buff);

		case_FillRect( hCompatibleDC_DDB, rc, "DDB" );
		case_ExtTextOut( hCompatibleDC_DDB, rc, "DDB" );
		case_PatBlt( hCompatibleDC_DDB, rc, "DDB" );

		case_FillRect( hCompatibleDC_DIB, rc, "DIB" );
		case_ExtTextOut( hCompatibleDC_DIB, rc, "DIB" );
		case_PatBlt( hCompatibleDC_DIB, rc, "DIB" );
		case_std_fill( (DWORD*)pvBits, rc, cx, cy );
		rc.right >>= 1;
		rc.bottom >>= 1;
	}

	::DeleteObject( hDDB );
	::DeleteObject( hDIB );
	::DeleteDC( hCompatibleDC_DDB );
	::DeleteDC( hCompatibleDC_DIB );
	::ReleaseDC( hDesktopWnd, hDesktopDC );
	return 0;
}

実行環境

OS : Windows 10 バージョン 1803
CPU : Core i5-4670
GPU : NVIDIA GeForce GTX 1070

実行結果

x, y, w, h : 0, 0, 3840, 2160
0.229 msec, case_FillRect, DDB
0.037 msec, case_ExtTextOut, DDB
0.101 msec, case_PatBlt, DDB
246.221 msec, case_FillRect, DIB
229.643 msec, case_ExtTextOut, DIB
226.226 msec, case_PatBlt, DIB
97.882 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 1920, 1080
0.416 msec, case_FillRect, DDB
0.022 msec, case_ExtTextOut, DDB
0.125 msec, case_PatBlt, DDB
57.648 msec, case_FillRect, DIB
56.706 msec, case_ExtTextOut, DIB
66.966 msec, case_PatBlt, DIB
19.206 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 960, 540
0.301 msec, case_FillRect, DDB
0.023 msec, case_ExtTextOut, DDB
0.188 msec, case_PatBlt, DDB
8.992 msec, case_FillRect, DIB
8.079 msec, case_ExtTextOut, DIB
8.232 msec, case_PatBlt, DIB
4.418 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 480, 270
0.773 msec, case_FillRect, DDB
0.023 msec, case_ExtTextOut, DDB
0.185 msec, case_PatBlt, DDB
2.385 msec, case_FillRect, DIB
2.401 msec, case_ExtTextOut, DIB
2.793 msec, case_PatBlt, DIB
1.148 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 240, 135
0.537 msec, case_FillRect, DDB
0.023 msec, case_ExtTextOut, DDB
0.133 msec, case_PatBlt, DDB
0.918 msec, case_FillRect, DIB
0.982 msec, case_ExtTextOut, DIB
0.822 msec, case_PatBlt, DIB
0.337 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 120, 67
0.492 msec, case_FillRect, DDB
0.030 msec, case_ExtTextOut, DDB
0.384 msec, case_PatBlt, DDB
0.464 msec, case_FillRect, DIB
0.308 msec, case_ExtTextOut, DIB
0.392 msec, case_PatBlt, DIB
0.109 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 60, 33
0.290 msec, case_FillRect, DDB
0.030 msec, case_ExtTextOut, DDB
0.236 msec, case_PatBlt, DDB
0.320 msec, case_FillRect, DIB
0.146 msec, case_ExtTextOut, DIB
0.304 msec, case_PatBlt, DIB
0.039 msec, case_std_fill, DIB
x, y, w, h : 0, 0, 30, 16
0.283 msec, case_FillRect, DDB
0.037 msec, case_ExtTextOut, DDB
0.165 msec, case_PatBlt, DDB
0.441 msec, case_FillRect, DIB
0.189 msec, case_ExtTextOut, DIB
0.289 msec, case_PatBlt, DIB
0.011 msec, case_std_fill, DIB