X-Git-Url: http://git.mutantstargoat.com?p=winnie;a=blobdiff_plain;f=src%2Fgfx.cc;fp=src%2Fgfx.cc;h=1da29539767792a7823f303ad0bc70abed2473a9;hp=0000000000000000000000000000000000000000;hb=59cd3a77c4517e387f4c2e21e8b62a9017370116;hpb=695cf39b73ecc76cbbc39e54f844ae55f4a9f938

diff --git a/src/gfx.cc b/src/gfx.cc
new file mode 100644
index 0000000..1da2953
--- /dev/null
+++ b/src/gfx.cc
@@ -0,0 +1,155 @@
+#include <string.h>
+
+#include "geom.h"
+#include "gfx.h"
+
+static Rect clipping_rect;
+
+void set_clipping_rect(const Rect &rect)
+{
+	clipping_rect = rect_intersection(rect, get_screen_size());
+}
+
+const Rect &get_clipping_rect()
+{
+	return clipping_rect;
+}
+
+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();
+
+	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)
+{
+	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++) {
+		memcpy(dptr, sptr, width * 4);
+		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)
+{
+	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] = r;
+				dptr[j * 4 + 1] = g;
+				dptr[j * 4 + 2] = b;
+			}
+		}
+
+		sptr += src_rect.width * 4;
+		dptr += dest_rect.width * 4;
+	}
+}