cgol

commit 716f8e9da4dac2284e386ecf075e18dc9746a891
parent 86d0e88d78b87a1318c7728656f9ad26c5b847a8
Author: aabacchus <ben@bvnf.space>
Date:   Mon, 27 Sep 2021 02:40:47 +0100

start project proper

Diffstat:
A
.gitignore
 | 
3
+++
M
Makefile
 | 
19
++++++++++++-------
A
cgol.h
 | 
15
+++++++++++++++
A
image.c
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
main.c
 | 
19
+++++++++++++++++++

5 files changed, 107 insertions(+), 7 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+cgol
+out.png
diff --git a/Makefile b/Makefile
@@ -2,17 +2,22 @@
 
 DEBUG = -g
 XCFLAGS = $(CFLAGS) -Wall -Wextra -Wpedantic $(DEBUG)
-CAIROFLAGS = $$(pkgconf --cflags --libs cairo)
+CAIROCFLAGS = $$(pkgconf --cflags cairo)
+CAIROLFLAGS = -lcairo
 
-BINS = \
-	   stroke
+OBJS = \
+	   image.o \
+	   main.o \
 
-all: $(BINS)
+all: cgol
 
-$(BINS): $(BINS:=.c)
-	$(CC) $(XCFLAGS) $(CAIROFLAGS) -o $@ $<
+%.o: %.c cgol.h
+	$(CC) -c $(XCFLAGS) $(CAIROCFLAGS) $<
+
+cgol: $(OBJS)
+	$(CC) $(LDFLAGS) $(CAIROLFLAGS) $(OBJS) -o cgol
 
 clean:
-	rm -f $(BINS)
+	rm -f $(OBJS) cgol
 
 .PHONY: clean
diff --git a/cgol.h b/cgol.h
@@ -0,0 +1,15 @@
+#include <cairo.h>
+#include <stdio.h>
+
+struct rgb {
+    double r, g, b;
+};
+
+struct imgdata {
+    double width, height;
+    int ny, nx;           /* number of columns and rows */
+    struct rgb a, i, b;   /* RGB for active, inactive, background pixels */
+};
+
+/* cells[i][j] should match i = img->ny, j = img->nx */
+int png(struct imgdata *img, short *cells, char *fname);
diff --git a/image.c b/image.c
@@ -0,0 +1,58 @@
+/*
+ * image.c
+ * Copyright (c) 2021 Ben Fuller
+ */
+#include "cgol.h"
+
+/* cells[i][j]; i = img->ny; j = img->nx */
+int
+png(struct imgdata *img, short *cells, char *fname)
+{
+    double width, height, scale;
+    int nx, ny;
+    cairo_surface_t *surface;
+    cairo_t *cr;
+    scale = 1;
+
+    width = img->width;
+    height = img->height;
+    nx = img->nx;
+    ny = img->ny;
+
+    surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+    cr = cairo_create(surface);
+    cairo_scale(cr, scale, scale);
+
+    /* background fill */
+    cairo_set_source_rgb(cr, img->b.r, img->b.g, img->b.b);
+    cairo_rectangle(cr, 0, 0, width/scale, height/scale);
+    cairo_fill(cr);
+
+    for (int i = 0; i < ny; i++) {
+        for (int j = 0; j < nx; j++) {
+            if (*(cells + i * nx + j))
+                cairo_set_source_rgb(cr, img->a.r, img->a.g, img->a.b);
+            else
+                cairo_set_source_rgb(cr, img->i.r, img->i.g, img->i.b);
+            cairo_rectangle(cr, j * width/nx/scale, i * height/ny/scale,
+                    width/nx/scale * 0.9,
+                    height/ny/scale * 0.9);
+            cairo_fill(cr);
+        }
+    }
+    cairo_status_t crs;
+    crs = cairo_status(cr);
+    if (crs != CAIRO_STATUS_SUCCESS) {
+        fprintf(stderr, "cairo: %s\n", cairo_status_to_string(crs));
+        cairo_destroy(cr);
+        cairo_surface_destroy(surface);
+        return 1;
+    }
+
+    /* Write output and clean up */
+    cairo_surface_write_to_png(surface, fname);
+    cairo_destroy(cr);
+    cairo_surface_destroy(surface);
+
+    return 0;
+}
diff --git a/main.c b/main.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2021 Ben Fuller
+ */
+#include "cgol.h"
+
+int
+main(void) {
+    struct imgdata img = {
+        200, 200,
+        11, 10,
+        { 1, 1, 1, },
+        { 0.1, 0.1, 0.1 },
+        { 0, 0, 0 }
+    };
+    short cells[11][10] = { 0 };
+    if (png(&img, &cells[0][0], "out.png") != 0)
+        return 1;
+    return 0;
+}