使用 devc++ 开发 easyx 实现 Direct2D 交互

代码为 codebus 另一先生的文案 EasyX 的三种绘图抗锯齿方法 - CodeBus

这里移植到 devc++

移植操作如下：

调用dev++ 的链接库方式：

project -> project option -> 如图所示

稍作修改的代码。

cpp 复制代码

#include <graphics.h>
#include <d2d1.h>
#include <wincodec.h>

#include <stdio.h>

#pragma comment(lib, "d2d1.lib")
#pragma comment(lib, "dwrite.lib")

// D2D 对象的安全释放
template <class T> void DxObjectSafeRelease(T** ppT)
{
	if (*ppT)
	{
		(*ppT)->Release();
		*ppT = NULL;
	}
}

int main()
{
	// 创建 EasyX 窗口
	initgraph(340, 206);
	SetWindowText(GetHWnd(), "D2D 硬件加速抗锯齿演示");

	setlinestyle(PS_SOLID, 2);

	// 创建 D2D 工厂
	ID2D1Factory* Facotry = NULL;
	HRESULT ResultHandle = D2D1CreateFactory(
		D2D1_FACTORY_TYPE_SINGLE_THREADED,
		&Facotry
	);

	// 创建 DC Render 并指定硬件加速
	auto Property = D2D1::RenderTargetProperties(
		D2D1_RENDER_TARGET_TYPE::D2D1_RENDER_TARGET_TYPE_HARDWARE,
		D2D1::PixelFormat(
			DXGI_FORMAT_B8G8R8A8_UNORM,
			D2D1_ALPHA_MODE_IGNORE
		), 0.0, 0.0, D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE, D2D1_FEATURE_LEVEL_DEFAULT
	);

	// 创建 EasyX 兼容的 DC Render Target
	ID2D1DCRenderTarget* DCRenderTarget;
	HRESULT Result = Facotry->CreateDCRenderTarget(
		&Property,
		&DCRenderTarget
	);

	// 绑定 EasyX DC
	RECT EasyXWindowRect = { 0, 0, 640, 480 };
	DCRenderTarget->BindDC(GetImageHDC(), &EasyXWindowRect);

	if (FAILED(Result))
	{
		printf("D2D Facotry Created Failed\n");

		return -1;
	}

	// 创建画笔
	ID2D1SolidColorBrush* WhiteBrush = NULL;
	DCRenderTarget->CreateSolidColorBrush(
		D2D1::ColorF(D2D1::ColorF::White),
		&WhiteBrush
	);

	if (!WhiteBrush)
	{
		printf("D2D Brush Created Failed\n");

		return -1;
	}

	BeginBatchDraw();

	// 设置抗锯齿
	DCRenderTarget->SetAntialiasMode(D2D1_ANTIALIAS_MODE::D2D1_ANTIALIAS_MODE_PER_PRIMITIVE);

	// 调用 D2D 进行绘图
	DCRenderTarget->BeginDraw();

	DCRenderTarget->Clear(D2D_COLOR_F(D3DCOLORVALUE{ 0, 0, 0 }));
	DCRenderTarget->DrawLine(D2D1_POINT_2F{ 200, 0 }, D2D1_POINT_2F{ 280, 80 }, WhiteBrush, 2.f);
	DCRenderTarget->DrawEllipse(D2D1_ELLIPSE{ D2D1_POINT_2F{ 240, 140 }, 40, 40 }, WhiteBrush, 2.f);

	DCRenderTarget->EndDraw();

	// EasyX 对比绘图
	line(0, 0, 80, 80);
	ellipse(0, 100, 80, 180);

	outtextxy(0, 80, "无抗锯齿画线");
	outtextxy(165, 80, "D2D 硬件加速抗锯齿画线");

	outtextxy(0, 184, "无抗锯齿画圆");
	outtextxy(165, 184, "D2D 硬件加速抗锯齿画圆");

	// 以约为 60fps 的帧率更新界面
	while (true)
	{
		FlushBatchDraw();

		Sleep(14);
	}

	EndBatchDraw();

	// 释放 D2D 对象
	DxObjectSafeRelease(&DCRenderTarget);
	DxObjectSafeRelease(&WhiteBrush);
	DxObjectSafeRelease(&Facotry);

	return 0;
}