1 files changed, 38 insertions, 0 deletions
diff --git a/text/layout.h b/text/layout.h
new file mode 100644
index 0000000..9282536
--- /dev/null
+++ b/text/layout.h
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+#ifndef VEGA_LAYOUT_H
+#define VEGA_LAYOUT_H
+#include "shape.h"
+
+/* A paragraph set into lines (docs/design/004-text.md): its bidi levels
+ * (UAX #9), lines broken where UAX #14 allows and they fit (spaces at a
+ * line's end hang past it), and each line's runs (one level, one script)
+ * shaped and put in visual order. Positions are in the font's units: x
+ * from the paragraph's left edge, y up from the line's baseline. */
+typedef struct {
+    uint32_t glyph;   /* the font's: its symbol is VEGA_GLYPH_SYMBOLS + glyph */
+    uint32_t cluster; /* the paragraph index of the first character it came from */
+    int32_t x, y, advance;
+} VegaPlaced;
+typedef struct {
+    size_t first, count; /* its glyphs, left to right */
+    size_t start, end;   /* the characters it holds, [start, end) */
+    int32_t left, width; /* where it starts and how far what shows goes */
+} VegaLine;
+typedef struct {
+    VegaLine *lines;
+    size_t line_count;
+    VegaPlaced *glyphs;
+    size_t glyph_count;
+    int level;           /* the paragraph's: odd is right to left, and its lines align right */
+    int32_t width;       /* the widest line's */
+    /* what setting the paragraph works in, kept for the next */
+    void *work;
+    size_t work_size, lines_allocated, glyphs_allocated;
+} VegaLayout;
+
+/* Set count characters in lines of at most width (0: no limit) with the
+ * font's shaping; direction is VEGA_BIDI_AUTO, _LTR or _RTL. The layout
+ * holds the result until it is set again; false without memory. */
+bool vega_layout(VegaLayout *, VegaShaper *, const VegaShaping *, const uint32_t *codes, size_t count, int direction,
+                 int32_t width);
+void vega_layout_free(VegaLayout *);
+#endif