diff options
Diffstat (limited to 'buffer.c')
| -rw-r--r-- | buffer.c | 56 |
1 files changed, 56 insertions, 0 deletions
@@ -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); +} |