61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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#pragma once
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class CDrawImg
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{
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public:
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CDrawImg(HWND wnd)
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{
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m_hbrush = CreateSolidBrush(RGB(0, 0, 0));
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pBmpInfo = (BITMAPINFO *)chBmpBuf;
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pBmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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pBmpInfo->bmiHeader.biPlanes = 1;
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pBmpInfo->bmiHeader.biCompression = BI_RGB;
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for (int i = 0; i < 256; i++)
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{
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pBmpInfo->bmiColors[i].rgbBlue = i;
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pBmpInfo->bmiColors[i].rgbGreen = i;
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pBmpInfo->bmiColors[i].rgbRed = i;
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pBmpInfo->bmiColors[i].rgbReserved = i;
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}
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GetClientRect(wnd, wrect);
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hdc = GetDC(wnd);
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}
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void Draw(int width, int height, int channels, uchar* data)
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{
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pBmpInfo->bmiHeader.biWidth = width;
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pBmpInfo->bmiHeader.biHeight = height;
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pBmpInfo->bmiHeader.biBitCount = 8 * channels;
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FillRect(hdc, wrect, m_hbrush);
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int DesX = 0;
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int DesY = wrect.Height();
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int DesWidth = wrect.Width();
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int DesHeight = wrect.Height();
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double ratio = width / (double)height;
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int WidthRequest = ratio * wrect.Height();
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int HeightRequest = wrect.Width() / ratio;
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if (wrect.Width() < WidthRequest)
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{
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DesHeight = DesWidth / ratio;
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DesY = (wrect.Height() - DesHeight) / 2 + DesHeight;
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}
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else if (wrect.Height() < HeightRequest)
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{
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DesWidth = DesHeight * ratio;
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DesX = (wrect.Width() - DesWidth) / 2;
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}
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::SetStretchBltMode(hdc, COLORONCOLOR);
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::StretchDIBits(hdc,
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DesX, DesY, DesWidth, -DesHeight,
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0, 0, width, height,
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data, pBmpInfo,
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DIB_RGB_COLORS, SRCCOPY);
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}
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private:
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char chBmpBuf[2048];
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BITMAPINFO *pBmpInfo;
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CRect wrect;
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HDC hdc;
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HBRUSH m_hbrush;
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};
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