271 lines
4.9 KiB
C
271 lines
4.9 KiB
C
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#include "gb.h"
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//=========================
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void gb_pixel_set(GB_BMP *b, int x, int y, unsigned c)
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{
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// ïîñòàâèòü òî÷êó
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unsigned s;
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if ((x+1 > b->w )||(y+1 > b->h))
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return;
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if ((x < 0)||(y < 0))
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return;
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s = 3*( y*(b->w) + x );
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*( b -> bmp + s ) = c & 0xff;
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*( b -> bmp + s + 1) = (c >> 8) & 0xff;
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*( b -> bmp + s + 2) = (c >> 16)& 0xff;
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}
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//=========================
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int gb_pixel_get(GB_BMP *b, int x, int y, unsigned *c)
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{
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// ïîëó÷èòü òî÷êó
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unsigned red, green, blue, s;
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if ((x < 0) || (y < 0))
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return 0;
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if ((x+1 > b->w )||(y+1 > b->h))
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return 0;
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s = 3*( y*(b->w) + x );
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blue = *( b -> bmp + s );
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green = *( b -> bmp + s + 1);
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red = *( b -> bmp + s + 2);
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*c = ((red << 16) & 0xff0000) | ((green << 8) & 0xff00) | (blue & 0xff);
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return 1;
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}
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//=========================
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void gb_line(GB_BMP *b, int x1, int y1, int x2, int y2, unsigned c)
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{
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// ëèíèÿ çàäàííîãî öâåòà ñ èñïîëüçîâàíèåì
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// àëãîpèòìà Áðåçåíõýìà
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int t, dist;
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int xerr=0, yerr=0, delta_x, delta_y;
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int incx, incy;
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// âû÷èñëåíèå pàññòîÿíèÿ â îáîèõ íàïpàâëåíèÿõ
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delta_x = x2 - x1;
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delta_y = y2 - y1;
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// îïpåäåëåíèå íàïpàâëåíèÿ øàãà,
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// øàã âû÷èñëÿåòñÿ ëèáî ïî âåpòèêàëüíîé, ëèáî ãîpèçîíòàëüíîé
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// ëèíèè
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if (delta_x > 0)
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incx = 1;
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else
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if (0 == delta_x)
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incx = 0;
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else
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incx = -1;
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if (delta_y > 0)
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incy = 1;
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else
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if ( 0 == delta_y)
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incy = 0;
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else
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incy = -1;
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// îïpåäåëåíèå íàèáîëüøåãî pàññòîÿíèÿ
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if (delta_x < 0)
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delta_x *= -1;
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if (delta_y < 0)
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delta_y *= -1;
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if (delta_x > delta_y)
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dist = delta_x;
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else
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dist = delta_y;
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// âû÷åp÷èâàíèå ëèíèè
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for (t = 0; t <= dist+1; t++)
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{
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gb_pixel_set(b, x1, y1, c);
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xerr+=delta_x;
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yerr+=delta_y;
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if (xerr > dist)
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{
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xerr -= dist;
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x1 += incx;
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}
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if (yerr > dist)
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{
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yerr -= dist;
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y1 += incy;
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}
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}
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}
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//=========================
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void gb_rect(GB_BMP *b, int x, int y, int w, int h, unsigned c)
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{
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// ïðÿìîóãîëüíèê
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gb_line (b, x, y, x+w-1, y, c);
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gb_line (b, x, y+h-1, x+w-1, y+h-1, c);
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gb_line (b, x, y, x, y+h-1, c);
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gb_line (b, x+w-1, y, x+w-1, y+h-1, c);
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}
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//=========================
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void gb_circle(GB_BMP *b, int x, int y, int r, unsigned c)
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{
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int _x;
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int _y;
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int d;
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_x = 0;
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_y = r;
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d = 3-2*r;
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while( _y >= _x)
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{
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gb_pixel_set(b, _x + x, _y + y, c);
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gb_pixel_set(b, _x + x, -_y + y, c);
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gb_pixel_set(b, -_x + x, _y + y, c);
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gb_pixel_set(b, -_x + x, -_y + y, c);
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gb_pixel_set(b, _y + x, _x + y, c);
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gb_pixel_set(b, _y + x, -_x + y, c);
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gb_pixel_set(b, -_y + x, _x + y, c);
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gb_pixel_set(b, -_y + x, -_x + y, c);
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if( d<0 )
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d = d+4*_x+6;
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else
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{
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d = d+4*(_x-_y)+10;
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_y--;
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}
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_x++;
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}
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}
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//=========================
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void gb_bar(GB_BMP *b, int x, int y, int w, int h, unsigned c)
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{
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// çàêðàøåííûé ïðÿìîóãîëüíèê
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unsigned s;
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int i, j;
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if ((x > b->w)||(y > b->h))
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return;
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for (j = 0; j < w; j++)
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for (i = 0; i < h; i++)
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// gb_pixel_set(b, x+j, y+i, c);
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{
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s = 3*( (y+i)*(b->w) + x + j );
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*( b -> bmp + s ) = c & 0xff;
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*( b -> bmp + s + 1) = (c >> 8) & 0xff;
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*( b -> bmp + s + 2) = (c >> 16)& 0xff;
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}
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}
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//=========================
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void gb_image_set(GB_BMP *b_dest, int x_d, int y_d, GB_BMP *b_src, int x_s, int y_s, int w, int h)
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{
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// âûâîä èçîáðàæåíèÿ
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int x, y;
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unsigned d;
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if ((x_d > b_dest->w)||(y_d > b_dest->h))
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return;
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if ((x_s > b_src->w)||(y_s > b_src->h))
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return;
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for (y = 0; y < h; y++)
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for (x = 0; x < w; x++)
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if ( gb_pixel_get(b_src, x_s+x, y_s+y, &d) )
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gb_pixel_set(b_dest, x_d+x, y_d+y, d);
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}
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//=========================
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void gb_image_set_t(GB_BMP *b_dest, int x_d, int y_d, GB_BMP *b_src, int x_s, int y_s, int w, int h, unsigned c)
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{
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// âûâîä èçîáðàæåíèÿ ñ ïðîçðà÷íûì öâåòîì
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int x, y;
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unsigned d;
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if ((x_d > b_dest->w)||(y_d > b_dest->h))
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return;
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if ((x_s > b_src->w)||(y_s > b_src->h))
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return;
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for (y = 0; y < h; y++)
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for (x = 0; x < w; x++)
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if ( gb_pixel_get(b_src, x_s+x, y_s+y, &d) )
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if (c != d)
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gb_pixel_set(b_dest, x_d+x, y_d+y, d);
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}
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//=========================
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#define NULL ((void*)0)
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typedef struct
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{
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void *name;
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void *function;
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} export_t;
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//=========================
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char szGb_pixel_set[] = "gb_pixel_set";
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char szGb_pixel_get[] = "gb_pixel_get";
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char szGb_line[] = "gb_line";
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char szGb_rect[] = "gb_rect";
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char szGb_bar[] = "gb_bar";
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char szGb_circle[] = "gb_circle";
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char szGb_image_set[] = "gb_image_set";
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char szGb_image_set_t[] = "gb_image_set_t";
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export_t EXPORTS[] =
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{
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{ szGb_pixel_set, (void*) gb_pixel_set},
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{ szGb_pixel_get, (void*) gb_pixel_get},
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{ szGb_line, (void*) gb_line},
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{ szGb_rect, (void*) gb_rect},
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{ szGb_bar, (void*) gb_bar},
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{ szGb_circle, (void*) gb_circle},
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{ szGb_image_set, (void*) gb_image_set},
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{ szGb_image_set_t, (void*) gb_image_set_t},
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{ NULL, NULL },
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};
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