--- st.h
+++ st.h
@@ -140,3 +156,69 @@ extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
 extern unsigned int defaultcs;
+
+// Accessors to decoration properties stored in `decor`.
+// The 25-th bit is used to indicate if it's a 24-bit color.
+static inline uint32_t tgetdecorcolor(Glyph *g) { return g->decor & 0x1ffffff; }
+static inline uint32_t tgetdecorstyle(Glyph *g) { return (g->decor >> 25) & 0x7; }
+static inline void tsetdecorcolor(Glyph *g, uint32_t color) {
+	g->decor = (g->decor & ~0x1ffffff) | (color & 0x1ffffff);
+}
+static inline void tsetdecorstyle(Glyph *g, uint32_t style) {
+	g->decor = (g->decor & ~(0x7 << 25)) | ((style & 0x7) << 25);
+}
+
+
+// Some accessors to image placeholder properties stored in `u`:
+// - row (1-base) - 9 bits
+// - column (1-base) - 9 bits
+// - most significant byte of the image id plus 1 - 9 bits (0 means unspecified,
+//   don't forget to subtract 1).
+// - the original number of diacritics (0, 1, 2, or 3) - 2 bits
+// - whether this is a classic (1) or Unicode (0) placeholder - 1 bit
+static inline uint32_t tgetimgrow(Glyph *g) { return g->u & 0x1ff; }
+static inline uint32_t tgetimgcol(Glyph *g) { return (g->u >> 9) & 0x1ff; }
+static inline uint32_t tgetimgid4thbyteplus1(Glyph *g) { return (g->u >> 18) & 0x1ff; }
+static inline uint32_t tgetimgdiacriticcount(Glyph *g) { return (g->u >> 27) & 0x3; }
+static inline uint32_t tgetisclassicplaceholder(Glyph *g) { return (g->u >> 29) & 0x1; }
+static inline void tsetimgrow(Glyph *g, uint32_t row) {
+	g->u = (g->u & ~0x1ff) | (row & 0x1ff);
+}
+static inline void tsetimgcol(Glyph *g, uint32_t col) {
+	g->u = (g->u & ~(0x1ff << 9)) | ((col & 0x1ff) << 9);
+}
+static inline void tsetimg4thbyteplus1(Glyph *g, uint32_t byteplus1) {
+	g->u = (g->u & ~(0x1ff << 18)) | ((byteplus1 & 0x1ff) << 18);
+}
+static inline void tsetimgdiacriticcount(Glyph *g, uint32_t count) {
+	g->u = (g->u & ~(0x3 << 27)) | ((count & 0x3) << 27);
+}
+static inline void tsetisclassicplaceholder(Glyph *g, uint32_t isclassic) {
+	g->u = (g->u & ~(0x1 << 29)) | ((isclassic & 0x1) << 29);
+}
+
+/// Returns the full image id. This is a naive implementation, if the most
+/// significant byte is not specified, it's assumed to be 0 instead of inferring
+/// it from the cells to the left.
+static inline uint32_t tgetimgid(Glyph *g) {
+	uint32_t msb = tgetimgid4thbyteplus1(g);
+	if (msb != 0)
+		--msb;
+	return (msb << 24) | (g->fg & 0xFFFFFF);
+}
+
+/// Sets the full image id.
+static inline void tsetimgid(Glyph *g, uint32_t id) {
+	g->fg = (id & 0xFFFFFF) | (1 << 24);
+	tsetimg4thbyteplus1(g, ((id >> 24) & 0xFF) + 1);
+}
+
+static inline uint32_t tgetimgplacementid(Glyph *g) {
+	if (tgetdecorcolor(g) == DECOR_DEFAULT_COLOR)
+		return 0;
+	return g->decor & 0xFFFFFF;
+}
+
+static inline void tsetimgplacementid(Glyph *g, uint32_t id) {
+	g->decor = (id & 0xFFFFFF) | (1 << 24);
+}