41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
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//---------------------------------------------------------------------------
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// Gradient.h - gradient drawing support
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//---------------------------------------------------------------------------
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#pragma once
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//---------------------------------------------------------------------------
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#define SYSCOLOR(c) (c|0x80000000)
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#define RGBA2WINCOLOR(color) (color.bBlue << 16) | (color.bGreen << 8) | (color.bRed);
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#define FIXCOLORVAL(val) ((val > 255) ? 255 : ((val < 0) ? 0 : val))
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//---------------------------------------------------------------------------
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struct RGBA
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{
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BYTE bRed;
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BYTE bGreen;
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BYTE bBlue;
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BYTE bAlpha; // not currently supported
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};
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//---------------------------------------------------------------------------
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struct GRADIENTPART
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{
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BYTE Ratio; // 0-255 ratio for this color (sum of ratios must be <= 255)
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RGBA Color;
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};
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//---------------------------------------------------------------------------
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//---- public ----
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HRESULT PaintGradientRadialRect(HDC hdc, RECT &rcBounds, int iPartCount,
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GRADIENTPART *pGradientParts);
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HRESULT PaintHorzGradient(HDC hdc, RECT &rcBounds, int iPartCount,
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GRADIENTPART *pGradientParts);
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HRESULT PaintVertGradient(HDC hdc, RECT &rcBounds, int iPartCount,
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GRADIENTPART *pGradientParts);
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//---- helpers ----
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void PaintGradientVertBand(HDC hdc, RECT &rcBand, COLORREF color1, COLORREF color2);
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void PaintGradientHorzBand(HDC hdc, RECT &rcBand, COLORREF color1, COLORREF color2);
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void PaintGradientRadialBand(HDC hdc, RECT &rcBand, int radiusOffset,
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int radius, COLORREF color1, COLORREF color2);
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//---------------------------------------------------------------------------
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