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