[draw] add ax_graphics in geom/graphics.h

src/geom/graphics.c

@@ -0,0 +1,40 @@
+#include "graphics.h"
+#include "../util/region.h"
+
+static size_t INITIAL_CAP = 32;
+
+struct ax_graphics* ax__graphics_new(struct rgn* dst_rgn)
+{
+    struct ax_graphics* gr =
+        ralloc_typed(dst_rgn, struct ax_graphics, 1);
+    gr->rgn = rgn_new(dst_rgn, MEDIUM);
+    gr->glyphs.siz = 0;
+    gr->glyphs.cap = 0;
+    ax__graphics_clear(gr, 0x000000);
+    return gr;
+}
+
+struct ax_glyph* ax__graphics_push(struct ax_graphics* gr)
+{
+    if (gr->glyphs.siz >= gr->glyphs.cap) {
+        size_t new_cap = gr->glyphs.cap * 2;
+        struct ax_glyph* new_data =
+            ralloc_typed(gr->rgn, struct ax_glyph, new_cap);
+        memcpy(new_data, gr->glyphs.data, gr->glyphs.siz * sizeof(struct ax_glyph));
+        gr->glyphs.cap = new_cap;
+        gr->glyphs.data = new_data;
+    }
+    return &gr->glyphs.data[gr->glyphs.siz++];
+}
+
+void ax__graphics_clear(struct ax_graphics* gr, uint64_t bg)
+{
+    size_t cap = (gr->glyphs.siz > (INITIAL_CAP / 2))
+        ? (gr->glyphs.cap * 2)
+        : INITIAL_CAP;
+    rgn_clear(gr->rgn);
+    gr->bg = bg;
+    gr->glyphs.siz = 0;
+    gr->glyphs.cap = cap;
+    gr->glyphs.data = ralloc_typed(gr->rgn, struct ax_glyph, cap);
+}

src/geom/graphics.enums

@@ -0,0 +1 @@
+[glyph (AX_GLYPH_RECT "rect")]

src/geom/graphics.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct rgn;
+
+enum ax_glyph_type {
+    AX_GLYPH_RECT = 0,
+    AX_GLYPH__COUNT,
+};
+
+struct ax_glyph_rect {
+    int32_t x, y;
+    uint32_t w, h;
+    uint64_t f;
+};
+
+struct ax_glyph {
+    enum ax_glyph_type ty;
+    union {
+        struct ax_glyph_rect rect;
+    } d;
+};
+
+struct ax_graphics {
+    struct rgn* rgn;
+
+    uint64_t bg;
+    struct {
+        size_t siz, cap;
+        struct ax_glyph* data;
+    } glyphs;
+};
+
+struct ax_graphics* ax__graphics_new(struct rgn* dst_rgn);
+void ax__graphics_clear(struct ax_graphics* gr, uint64_t bg);
+
+struct ax_glyph* ax__graphics_push(struct ax_graphics* gr);
+
+static inline
+size_t ax__graphics_glyph_count(const struct ax_graphics* gr) {
+    return gr->glyphs.siz;
+}
+
+static inline
+const struct ax_glyph* ax__graphics_glyph(const struct ax_graphics* gr,
+                                          size_t i) {
+    return &gr->glyphs.data[i];
+}