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-rw-r--r--buffer.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/buffer.c b/buffer.c
index 78fcc1a..8641eb1 100644
--- a/buffer.c
+++ b/buffer.c
@@ -3,7 +3,9 @@
// blocks of a few thousand bytes. Block boundaries are not necessarily
// on character boundaries, so one block might have part of a UTF-8 character
// with the next block having the rest.
+#include "unicode.h"
#include "util.c"
+#include "text.h"
#define TEXT_BLOCK_MAX_SIZE 400
// Once two adjacent blocks are at most this big, combine them into
@@ -114,3 +116,57 @@ void text_buffer_free(TextBuffer *buffer) {
}
free(blocks);
}
+
+// Render the text buffer in the given rectangle
+void text_buffer_render(TextBuffer *buffer, Font *font, float box_x, float box_y, float box_w, float box_h) {
+ mbstate_t mbstate = {0};
+ uint nblocks = buffer->nblocks;
+ TextBlock *blocks = buffer->blocks;
+ text_chars_begin(font);
+ TextRenderState text_state = {
+ .x = box_x, .y = box_y,
+ .edge_right = box_x+box_w,
+ .edge_bottom = box_y+box_h
+ };
+
+ for (uint block_idx = 0; block_idx < nblocks; ++block_idx) {
+ TextBlock *block = &blocks[block_idx];
+ char *p = block->contents, *end = p + block->len;
+ while (p != end) {
+ char32_t c;
+ size_t n = mbrtoc32(&c, p, (size_t)(end - p), &mbstate);
+ if (n == 0) {
+ // null character
+ c = UNICODE_BOX_CHARACTER;
+ ++p;
+ } else if (n == (size_t)(-3)) {
+ // no bytes consumed, but a character was produced
+ } else if (n == (size_t)(-2)) {
+ // incomplete character at end of block.
+ c = 0;
+ p = end;
+ } else if (n == (size_t)(-1)) {
+ // invalid UTF-8
+ c = UNICODE_BOX_CHARACTER;
+ ++p;
+ } else {
+ p += n;
+ }
+ switch (c) {
+ case L'\n':
+ text_state.x = box_x;
+ text_state.y -= text_font_char_height(font);
+ break;
+ case L'\r': break; // for CRLF line endings
+ case L'\t':
+ for (int i = 0; i < 4; ++i)
+ text_render_char(font, L' ', &text_state);
+ break;
+ default:
+ text_render_char(font, c, &text_state);
+ break;
+ }
+ }
+ }
+ text_chars_end(font);
+}