245 lines
8.6 KiB
C++
245 lines
8.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// CDraw32 Class Interface
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//
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// Basic drawing routines for 32-bit per pixel buffer
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///////////////////////////////////////////////////////////////////////////////
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#if !defined(CM_DRAW_H_INC)
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#define CM_DRAW_H_INC
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// calc offset into image array for a pixel at (x,y)
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#define PIXPOS(x,y,stride) (((y)*(stride))+(x))
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#ifndef MIN
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// handy macros
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#define ABS(x) ((x)<0 ? -(x):(x))
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#define SIGN(x) (((x) < 0) ? -1 : (((x) > 0) ? 1 : 0))
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#endif
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#ifndef CLAMP
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#define SWAP(a,b) { a^=b; b^=a; a^=b; }
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#define SQR(a) ((a)*(a))
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#define CLAMP(v,l,h) ((v)<(l) ? (l) : (v) > (h) ? (h) : (v))
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#define LERP(t, a, b) (((b)-(a))*(t) + (a))
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// round a to nearest integer towards 0
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#define FLOOR(a) ((a)>0 ? (int)(a) : -(int)(-a))
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// round a to nearest integer away from 0
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#define CEILING(a) \
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((a)==(int)(a) ? (a) : (a)>0 ? 1+(int)(a) : -(1+(int)(-a)))
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#include <stdlib.h>
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#endif
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class CPixel32
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{
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public:
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byte r;
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byte g;
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byte b;
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byte a;
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CPixel32(byte R = 0, byte G = 0, byte B = 0, byte A = 255) : r(R), g(G), b(B), a(A) {}
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CPixel32(long l) {r = (l >> 24) & 0xff; g = (l >> 16) & 0xff; b = (l >> 8) & 0xff; a = l & 0xff;};
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~CPixel32()
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{}
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};
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#define PIX32_SIZE sizeof(CPixel32)
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// standard image operator macros
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#define IMAGE_SIZE(width,height) ((width)*(height)*(PIX32_SIZE))
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inline CPixel32 AVE_PIX (CPixel32 x, CPixel32 y)
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{ CPixel32 t; t.r = (byte)(((int)x.r + (int)y.r)>>1);
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t.g = (byte)(((int)x.g + (int)y.g)>>1);
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t.b = (byte)(((int)x.b + (int)y.b)>>1);
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t.a = (byte)(((int)x.a + (int)y.a)>>1); return t;}
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inline CPixel32 ALPHA_PIX (CPixel32 x, CPixel32 y, long alpha, long inv_alpha)
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{ CPixel32 t; t.r = (byte)((x.r*alpha + y.r*inv_alpha)>>8);
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t.g = (byte)((x.g*alpha + y.g*inv_alpha)>>8);
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t.b = (byte)((x.b*alpha + y.b*inv_alpha)>>8);
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// t.a = (byte)((x.a*alpha + y.a*inv_alpha)>>8); return t;}
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t.a = y.a; return t;}
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inline CPixel32 LIGHT_PIX (CPixel32 p, long light)
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{ CPixel32 t;
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t.r = (byte)CLAMP(((p.r * light)>>10) + p.r, 0, 255);
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t.g = (byte)CLAMP(((p.g * light)>>10) + p.g, 0, 255);
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t.b = (byte)CLAMP(((p.b * light)>>10) + p.b, 0, 255);
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t.a = p.a; return t;}
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// Colors are 32-bit RGBA
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// draw class
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class CDraw32
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{
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public: // static drawing context - static so we set only ONCE for many draw calls
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static CPixel32* buffer; // pointer to pixel buffer (one active)
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static long buf_width; // size of buffer
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static long buf_height; // size of buffer
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static long stride; // stride of buffer in pixels
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static long clip_min_x; // clip bounds
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static long clip_min_y; // clip bounds
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static long clip_max_x; // clip bounds
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static long clip_max_y; // clip bounds
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static long* row_off; // Table for quick Y calculations
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private:
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void BlitClip(long& dstX, long& dstY,
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long& width, long& height,
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long& srcX, long& srcY);
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protected:
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public:
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CDraw32(); // constructor
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~CDraw32(); // destructor
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// set the rect to clip drawing functions to
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static void SetClip(long min_x, long min_y,long max_x, long max_y)
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{clip_min_x = MAX(min_x,0); clip_max_x = MIN(max_x,buf_width-1);
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clip_min_y = MAX(min_y,0); clip_max_y = MIN(max_y,buf_height-1);}
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static void GetClip(long& min_x, long& min_y,long& max_x, long& max_y)
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{min_x = clip_min_x; min_y = clip_min_y;
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max_x = clip_max_x; max_y = clip_max_y; }
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// set the buffer to use for drawing off-screen
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static void SetBuffer(CPixel32* buf) {buffer = buf;};
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// set the dimensions of the off-screen buffer
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static bool SetBufferSize(long width,long height,long stride_len);
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// call this to free the table for quick y calcs before the program ends
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static void CleanUp(void)
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{if (row_off) delete [] row_off; row_off=NULL; buf_width=0; buf_height=0;}
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// set a pixel at (x,y) to color (no clipping)
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void PutPixNC(long x, long y, CPixel32 color)
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{buffer[row_off[y] + x] = color;}
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// set a pixel at (x,y) to color
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void PutPix(long x, long y, CPixel32 color)
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{ // clipping check
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if (x < clip_min_x || x > clip_max_x ||
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y < clip_min_y || y > clip_max_y)
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return;
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PutPixNC(x,y,color);
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}
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// get the color of a pixel at (x,y)
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CPixel32 GetPix(long x, long y)
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{return buffer[row_off[y] + x];}
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// set a pixel at (x,y) with 50% translucency (no clip)
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void PutPixAveNC(long x, long y, CPixel32 color)
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{ PutPixNC(x,y,AVE_PIX(GetPix(x, y), color)); }
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// set a pixel at (x,y) with 50% translucency
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void PutPixAve(long x, long y, CPixel32 color)
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{ // clipping check
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if (x < clip_min_x || x > clip_max_x ||
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y < clip_min_y || y > clip_max_y)
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return;
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PutPixNC(x,y,AVE_PIX(GetPix(x, y), color));
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}
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// set a pixel at (x,y) with translucency level (no clip)
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void PutPixAlphaNC(long x, long y, CPixel32 color)
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{ PutPixNC(x,y,ALPHA_PIX(color, GetPix(x, y), color.a, 256-color.a));}
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// set a pixel at (x,y) with translucency level
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void PutPixAlpha(long x, long y, CPixel32 color)
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{ // clipping check
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if (x < clip_min_x || x > clip_max_x ||
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y < clip_min_y || y > clip_max_y)
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return;
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PutPixNC(x,y,ALPHA_PIX(color, GetPix(x, y), color.a, 256-color.a));}
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// clear screen buffer to color from start to end line
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void ClearLines(CPixel32 color,long start,long end);
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// clear screen buffer to color provided
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void ClearBuffer(CPixel32 color)
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{ClearLines(color,0,buf_height-1);};
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// fill buffer alpha from start to end line
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void SetAlphaLines(byte alpha,long start,long end);
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// clear screen buffer to color provided
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void SetAlphaBuffer(byte alpha)
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{SetAlphaLines(alpha,0,buf_height-1);};
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// clip a line segment to the clip rect
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bool ClipLine(long& x1, long& y1, long& x2, long& y2);
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// draw a solid colored line, no clipping
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void DrawLineNC(long x1, long y1, long x2, long y2, CPixel32 color);
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// draw a solid color line
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void DrawLine(long x1, long y1, long x2, long y2, CPixel32 color)
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{ if (ClipLine(x1,y1,x2,y2)) DrawLineNC(x1,y1,x2,y2,color);}
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void DrawLineAveNC(long x1, long y1, long x2, long y2, CPixel32 color);
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// draw a translucent solid color line
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void DrawLineAve(long x1, long y1, long x2, long y2, CPixel32 color)
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{ if (ClipLine(x1,y1,x2,y2)) DrawLineAveNC(x1,y1,x2,y2,color);}
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// draw an anti-aliased line, no clipping
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void DrawLineAANC(long x0, long y0, long x1, long y1, CPixel32 color);
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// draw an anti-aliased line
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void DrawLineAA(long x1, long y1, long x2, long y2, CPixel32 color)
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{ if (ClipLine(x1,y1,x2,y2)) DrawLineAANC(x1,y1,x2,y2,color);}
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// draw a filled rectangle, no clipping
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void DrawRectNC(long ulx, long uly, long width, long height,CPixel32 color);
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// draw a filled rectangle
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void DrawRect(long ulx, long uly, long width, long height, CPixel32 color);
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// draw a filled rectangle
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void DrawRectAve(long ulx, long uly, long width, long height,CPixel32 color);
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// draw a box (unfilled rectangle) no clip
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void DrawBoxNC(long ulx, long uly, long width, long height, CPixel32 color);
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// draw a box (unfilled rectangle)
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void DrawBox(long ulx, long uly, long width, long height, CPixel32 color);
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// draw a box (unfilled rectangle)
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void DrawBoxAve(long ulx, long uly, long width, long height, CPixel32 color);
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// draw a circle with fill and edge colors
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void DrawCircle(long xc, long yc, long r, CPixel32 edge, CPixel32 fill);
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// draw a circle with fill and edge colors averaged with dest
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void DrawCircleAve(long xc, long yc, long r, CPixel32 edge, CPixel32 fill);
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// draw a polygon (complex) with fill and edge colors
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void DrawPolygon(long nvert, POINT *point, CPixel32 edge, CPixel32 fill);
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// simple blit function
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void BlitNC(long dstX, long dstY, long dstWidth, long dstHeight,
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CPixel32* srcImage, long srcX, long srcY, long srcStride);
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void Blit(long dstX, long dstY, long dstWidth, long dstHeight,
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CPixel32* srcImage, long srcX, long srcY, long srcStride);
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// blit image times color
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void BlitColor(long dstX, long dstY, long dstWidth, long dstHeight,
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CPixel32* srcImage, long srcX, long srcY, long srcStride, CPixel32 color);
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void Emboss(long dstX, long dstY, long width, long height,
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CPixel32* clrImage, long clrX, long clrY, long clrStride);
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};
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///////////////////////////////////////////////////////////////////////////////
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#endif
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