initial commit, basic platform and rendering code.

1 files changed, 98 insertions, 0 deletions

diff --git a/convimg.c b/convimg.c
new file mode 100644
index 0000000..631a8b1
--- /dev/null
+++ b/convimg.c
@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+	unsigned char r, g, b, a;
+} Colour;
+
+int main(int argc, char** argv) {
+	FILE* outfile, * infile;
+	char bmp_magic[2];
+	int ret = 0;
+	unsigned bmp_offset;
+	int bmp_w, bmp_h, x, y, s, bs;
+	unsigned short bmp_bits;
+	unsigned* bitmap;
+	Colour pixel, * buffer;
+	unsigned char t;
+
+	if (argc < 3) {
+		fprintf(stderr, "Usage: %s infile outfile.\n", argv[0]);
+		return 1;
+	}
+
+	infile = fopen(argv[1], "rb");
+	if (!infile) {
+		fprintf(stderr, "Failed to open %s.\n", argv[1]);
+		return 2;
+	}
+
+	fread(bmp_magic, 2, 1, infile);
+	if (bmp_magic[0] != 'B' || bmp_magic[1] != 'M') {
+		ret = 3;
+		fprintf(stderr, "Not a valid bitmap file.\n");
+		goto end;
+	}
+	
+	fseek(infile, 10, SEEK_SET);
+	fread(&bmp_offset, 4, 1, infile);
+
+	fseek(infile, 18, SEEK_SET);
+	fread(&bmp_w,    4, 1, infile);
+	fread(&bmp_h,    4, 1, infile);
+	fseek(infile, 28, SEEK_SET);
+	fread(&bmp_bits, 2, 1, infile);
+
+	if (bmp_bits != 32) {
+		ret = 4;
+		fprintf(stderr, "Bitmap must have 32 bit pixels. %d\n", bmp_bits);
+		goto end;
+	}
+
+	fseek(infile, bmp_offset, SEEK_SET);
+
+	s = bmp_w * bmp_h;
+	buffer = malloc(s * 4);
+	/* Read & flip */
+	for (y = 0; y < bmp_h; y++) {
+		for (x = 0; x < bmp_w; x++) {
+			fread(&pixel, 1, 4, infile);
+			t = pixel.r;
+			pixel.r = pixel.b;
+			pixel.b = t;
+			if (pixel.a == 0) {
+				pixel.r = 0;
+				pixel.g = 0;
+				pixel.b = 0;
+			}
+			buffer[x + (bmp_h - y - 1) * bmp_w] = pixel;
+		}
+	}
+
+	outfile = fopen(argv[2], "wb");
+	if (!outfile) {
+		fprintf(stderr, "Failed to open %s.\n", argv[2]);
+		fclose(infile);
+		return 2;
+	}
+	bs = (bmp_w * bmp_h + 32) / 32 * 4;
+	bitmap = calloc(bs, 1);
+	for (y = 0; y < bmp_h; y++) {
+		for (x = 0; x < bmp_w; x++) {
+			int idx = x + y * bmp_w;
+			if (buffer[idx].r) {
+				bitmap[idx / 32] |= 1 << (idx % 32);
+			}
+		}
+	}
+	fwrite(&bmp_w, 1, 2, outfile);
+	fwrite(&bmp_h, 1, 2, outfile);
+	fwrite(bitmap, 1, bs, outfile);
+	free(buffer);
+
+end:
+	fclose(infile);
+	fclose(outfile);
+	return ret;
+}