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Diffstat (limited to 'libwinnie/src/gfx.cc')
| -rw-r--r-- | libwinnie/src/gfx.cc | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/libwinnie/src/gfx.cc b/libwinnie/src/gfx.cc new file mode 100644 index 0000000..b72e43b --- /dev/null +++ b/libwinnie/src/gfx.cc @@ -0,0 +1,175 @@ +/* +winnie - an experimental window system + +Copyright (C) 2013 Eleni Maria Stea + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. + +Author: Eleni Maria Stea <elene.mst@gmail.com> +*/ + +#include <string.h> + +#include "geom.h" +#include "gfx.h" + +void clear_screen(int r, int g, int b) +{ + Rect screen_rect = get_screen_size(); + fill_rect(screen_rect, r, g, b); +} + +void fill_rect(const Rect &rect, int r, int g, int b) +{ + Rect drect = rect; + Rect screen_rect = get_screen_size(); + Rect clipping_rect = get_clipping_rect(); + + if(drect.x < clipping_rect.x) { + drect.width -= clipping_rect.x - drect.x; + drect.x = clipping_rect.x; + } + + if(drect.y < clipping_rect.y) { + drect.height -= clipping_rect.y - drect.y; + drect.y = clipping_rect.y; + } + + if(drect.x + drect.width >= clipping_rect.x + clipping_rect.width) { + drect.width = clipping_rect.width + clipping_rect.x - drect.x; + } + + if(drect.y + drect.height >= clipping_rect.y + clipping_rect.height) { + drect.height = clipping_rect.height + clipping_rect.y - drect.y; + } + + unsigned char *fb = get_framebuffer() + (drect.x + screen_rect.width * drect.y) * 4; + for(int i=0; i<drect.height; i++) { + for(int j=0; j<drect.width; j++) { + fb[j * 4] = b; + fb[j * 4 + 1] = g; + fb[j * 4 + 2] = r; + } + fb += screen_rect.width * 4; + } +} + +void blit(unsigned char *src_img, const Rect &src_rect, unsigned char* dest_img, + const Rect &dest_rect, int dest_x, int dest_y) +{ + int red_offs, green_offs, blue_offs; + get_rgb_order(&red_offs, &green_offs, &blue_offs); + + Rect irect = rect_intersection(get_clipping_rect(), dest_rect); + + int width = src_rect.width; + int height = src_rect.height; + + int xoffs = dest_x - irect.x; + if(xoffs < 0) { + dest_x = irect.x; + width += xoffs; + } + + int yoffs = dest_y - irect.y; + if(yoffs < 0) { + dest_y = irect.y; + height += yoffs; + } + + int xend = dest_x + width; + if(xend >= irect.width) { + width -= xend - irect.width; + } + + int yend = dest_y + height; + if(yend >= irect.height) { + height -= yend - irect.height; + } + + if(width <= 0 || height <= 0) { + return; + } + + unsigned char *sptr = src_img + (src_rect.y * src_rect.width + src_rect.x) * 4; + unsigned char *dptr = dest_img + (dest_y * dest_rect.width + dest_x) * 4; + + for(int i=0; i<height; i++) { + for(int j=0; j<width; j++) { + dptr[j * 4 + red_offs] = sptr[j * 4]; + dptr[j * 4 + green_offs] = sptr[j * 4 + 1]; + dptr[j * 4 + blue_offs] = sptr[j * 4 + 2]; + } + sptr += src_rect.width * 4; + dptr += dest_rect.width * 4; + } +} + +void blit_key(unsigned char *src_img, const Rect &src_rect, unsigned char* dest_img, + const Rect &dest_rect, int dest_x, int dest_y, int key_r, int key_g, int key_b) +{ + int red_offs, green_offs, blue_offs; + get_rgb_order(&red_offs, &green_offs, &blue_offs); + + Rect irect = rect_intersection(get_clipping_rect(), dest_rect); + + int width = src_rect.width; + int height = src_rect.height; + + int xoffs = dest_x - irect.x; + if(xoffs < 0) { + dest_x = irect.x; + width += xoffs; + } + + int yoffs = dest_y - irect.y; + if(yoffs < 0) { + dest_y = irect.y; + height += yoffs; + } + + int xend = dest_x + width; + if(xend >= irect.width) { + width -= xend - irect.width; + } + + int yend = dest_y + height; + if(yend >= irect.height) { + height -= yend - irect.height; + } + + if(width <= 0 || height <= 0) { + return; + } + + unsigned char *sptr = src_img + (src_rect.y * src_rect.width + src_rect.x) * 4; + unsigned char *dptr = dest_img + (dest_y * dest_rect.width + dest_x) * 4; + + for(int i=0; i<height; i++) { + for(int j=0; j<width; j++) { + int r = sptr[j * 4]; + int g = sptr[j * 4 + 1]; + int b = sptr[j * 4 + 2]; + + if(r != key_r || g != key_g || b != key_b) { + dptr[j * 4 + red_offs] = r; + dptr[j * 4 + green_offs] = g; + dptr[j * 4 + blue_offs] = b; + } + } + + sptr += src_rect.width * 4; + dptr += dest_rect.width * 4; + } +} |