用gdi32绘制像素 [英] Draw pixels with gdi32

问题描述

我需要使用gdi32和c ++绘制和着色像素的帮助.有人可以帮忙吗?

I need help drawing and shading pixels with gdi32 and c++. Can anybody help?

推荐答案

这是一个想法

Here''s a thought

#define RGB_GETBLUE(rgb)  (((rgb) >> 16) & 0xff)
#define RGB_GETGREEN(rgb) (((rgb) >> 8) & 0xff)
#define RGB_GETRED(rgb)   ((rgb) & 0xff)

COLORREF pix = ::GetPixel(hDC, x, y);

int red   = RGB_GETRED(pix);
int green = RGB_GETGREEN(pix);
int blue  = RGB_GETBLUE(pix);

float shadowEffect = 0.5f;

red   = static_cast<int>(red * shadowEffect);
green = static_cast<int>(green * shadowEffect);
blue  = static_cast<int>(blue * shadowEffect);

::SetPixel(hDC, x, y, RGB(red, green, blue));

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