From e9f94e36a82f4688aaac0e9837d9c566b47074b9 Mon Sep 17 00:00:00 2001
From: Andri Yngvason <andri@yngvason.is>
Date: Sun, 25 Aug 2019 17:36:25 +0000
Subject: [PATCH] Just saving this somewhere

---
 trle.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/trle.c b/trle.c
index 88ad047..452fa78 100644
--- a/trle.c
+++ b/trle.c
@@ -9,6 +9,103 @@ struct vnc_fb {
 	uint32_t height;
 };
 
+struct rgb_pixfmt {
+	int bits_per_pixel;
+	uint32_t red_mask;
+	uint32_t green_mask;
+	uint32_t blue_mask;
+};
+
+void convert_rgb_to_rgb(uint8_t * __restrict__ dst, const struct rgb_pixfmt *dstfmt,
+			const uint8_t * __restrict__ src, const struct rgb_pixfmt *srcfmt,
+			size_t len)
+{
+	int dst_bpp = dstfmt->bits_per_pixel / 8;
+	int src_bpp = srcfmt->bits_per_pixel / 8;
+
+	int sri = ffs(srcfmt->red_mask) - 1;
+	int sgi = ffs(srcfmt->green_mask) - 1;
+	int sbi = ffs(srcfmt->blue_mask) - 1;
+
+	int dri = ffs(dstfmt->red_mask) - 1;
+	int dgi = ffs(dstfmt->green_mask) - 1;
+	int dbi = ffs(dstfmt->blue_mask) - 1;
+
+	int srl = ffs(~(srcfmt->red_mask >> sri)) - 1;
+	int sgl = ffs(~(srcfmt->green_mask >> sgi)) - 1;
+	int sbl = ffs(~(srcfmt->blue_mask >> sbi)) - 1;
+
+	int drl = ffs(~(dstfmt->red_mask >> dri)) - 1;
+	int dgl = ffs(~(dstfmt->green_mask >> dgi)) - 1;
+	int dbl = ffs(~(dstfmt->blue_mask >> dbi)) - 1;
+
+	uint32_t dst_mask =
+		dstfmt->red_mask | dstfmt->green_mask | dstfmt->blue_mask;
+
+		const uint32_t * __restrict__ s = (const uint32_t*)(src);
+		uint32_t * __restrict__ d = (uint32_t*)(dst);
+	for (size_t i = 0; i < len; ++i) {
+		uint32_t x = s[i];
+
+		d[i] =
+			((((x & dstfmt->red_mask) >> sri) << drl >> srl) << dri) |
+			((((x & dstfmt->green_mask) >> sgi) << dgl >> sgl) << dgi) |
+			((((x & dstfmt->blue_mask) >> sbi) << dbl >> sbl) << dbi);
+
+	}
+
+	/*
+	for (size_t i = 0; i < len; ++i) {
+//		uint32_t *s = (uint32_t*)(src + i * src_bpp);
+//		uint32_t *d = (uint32_t*)(dst + i * dst_bpp);
+
+
+
+//		*d &= ~dst_mask;
+//		*d |= ((*s >> sri) * drm / srm) << dri;
+//		*d |= ((*s >> sgi) * dgm / sgm) << dgi;
+//		*d |= ((*s >> sbi) * dbm / sbm) << dbi;
+	}
+	*/
+}
+
+/*
+#define X(sname, dname, r, g, b) \
+void sname ## _to_ ## dname(uint8_t *dst, const uint8_t *src, size_t len) \
+{ \
+	for (int i = 0; i < len; ++i) { \
+		dst[i * 3 + 0] = src[i * 4 + r]; \
+		dst[i * 3 + 1] = src[i * 4 + g]; \
+		dst[i * 3 + 2] = src[i * 4 + b]; \
+	} \
+}
+
+X(RGBX8888, RGB888, 0, 1, 2)
+X(BGRX8888, RGB888, 2, 1, 0)
+X(XRGB8888, RGB888, 1, 2, 3)
+X(XBGR8888, RGB888, 3, 2, 1)
+#undef X
+
+#define X(sname, dname, r, g, b) \
+void sname ## _to_ ## dname(uint8_t *dst, const uint8_t *src, size_t len) \
+{ \
+	uint32_t *x = (uint32_t*)src; \
+ \
+	for (int i = 0; i < len; ++i) { \
+		dst[i * 3 + 0] = (x[i] >> (r + 2)) & 0xff; \
+		dst[i * 3 + 1] = (x[i] >> (g + 2)) & 0xff; \
+		dst[i * 3 + 2] = (x[i] >> (b + 2)) & 0xff; \
+	} \
+}
+
+X(RGBX1010102, RGB888, 22, 12, 2)
+X(BGRX1010102, RGB888, 2, 12, 22)
+X(XRGB1010102, RGB888, 20, 10, 0)
+X(XBGR1010102, RGB888, 0, 10, 20)
+
+#undef X
+*/
+
 void rfb_zrle_encode_tile(uint8_t *dst, uint32_t dst_pixfmt,
 			  const struct vnc_fb *src)
 {