391 lines
14 KiB
C++
391 lines
14 KiB
C++
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/*
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4coder_layout_rule.cpp - Built in layout rules and layout rule helpers.
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*/
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// TOP
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function void
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layout_write(Arena *arena, Layout_Item_List *list,
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i64 index, u32 codepoint, Layout_Item_Flag flags, Rect_f32 rect){
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Temp_Memory restore_point = begin_temp(arena);
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Layout_Item *item = push_array(arena, Layout_Item, 1);
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Layout_Item_Block *block = list->first;
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if (block != 0){
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if (block->items + block->count == item){
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block->count += 1;
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}
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else{
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block = 0;
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}
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}
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if (block == 0){
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end_temp(restore_point);
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block = push_array(arena, Layout_Item_Block, 1);
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item = push_array(arena, Layout_Item, 1);
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sll_queue_push(list->first, list->last, block);
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list->node_count += 1;
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block->items = item;
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block->count = 1;
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}
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list->total_count += 1;
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if (index > list->index_range.max){
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block->character_count += 1;
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list->character_count += 1;
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list->index_range.max = index;
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}
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item->index = index;
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item->codepoint = codepoint;
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item->flags = flags;
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item->rect = rect;
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list->height = max(list->height, rect.y1);
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}
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function Layout_Item_List
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layout_wrap_anywhere(Application_Links *app, Arena *arena, Buffer_ID buffer,
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Range_i64 range, Face_ID face, f32 width){
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Scratch_Block scratch(app);
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Layout_Item_List list = {};
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list.index_range.first = range.first;
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list.index_range.one_past_last = range.first - 1;
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String_Const_u8 text = push_buffer_range(app, scratch, buffer, range);
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Face_Advance_Map advance_map = get_face_advance_map(app, face);
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Face_Metrics metrics = get_face_metrics(app, face);
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f32 line_height = metrics.line_height;
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f32 text_height = metrics.text_height;
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f32 line_to_text_shift = text_height - line_height;
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f32 space_advance = metrics.space_advance;
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if (text.size == 0){
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f32 next_x = space_advance;
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layout_write(arena, &list, range.first, ' ', 0,
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Rf32(V2(0.f, 0.f), V2f32(next_x, text_height)));
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}
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else{
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Vec2_f32 p = {};
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f32 line_y = line_height;
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f32 text_y = text_height;
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i64 index = range.first;
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b32 first_of_the_line = true;
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b32 consuming_newline_characters = false;
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i64 newline_character_index = -1;
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b32 prev_did_emit_newline = false;
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u8 *ptr = text.str;
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u8 *end_ptr = ptr + text.size;
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for (;ptr < end_ptr;){
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Character_Consume_Result consume = utf8_consume(ptr, (umem)(end_ptr - ptr));
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u32 render_codepoint = consume.codepoint;
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b32 emit_newline = false;
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switch (consume.codepoint){
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case '\t':
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{
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render_codepoint = ' ';
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}//fallthrough;
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default:
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{
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f32 advance = font_get_glyph_advance(&advance_map, &metrics,
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consume.codepoint);
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f32 next_x = p.x + advance;
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if (!first_of_the_line && next_x > width){
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p.y = line_y;
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p.x = 0.f;
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line_y += line_height;
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text_y = line_y + line_to_text_shift;
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next_x = advance;
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}
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layout_write(arena, &list, index,
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render_codepoint, 0,
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Rf32(p, V2f32(next_x, text_y)));
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p.x = next_x;
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ptr += consume.inc;
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index += consume.inc;
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first_of_the_line = false;
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}break;
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case '\r':
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{
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if (!consuming_newline_characters){
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consuming_newline_characters = true;
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newline_character_index = index;
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}
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ptr += 1;
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index += 1;
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}break;
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case '\n':
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{
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if (!consuming_newline_characters){
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consuming_newline_characters = true;
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newline_character_index = index;
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}
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emit_newline = true;
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ptr += 1;
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index += 1;
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}break;
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case max_u32:
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{
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f32 next_x = p.x + metrics.byte_advance;
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if (!first_of_the_line && next_x > width){
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p.y = line_y;
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p.x = 0.f;
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line_y += line_height;
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text_y = line_y + line_to_text_shift;
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next_x = p.x + metrics.byte_advance;
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}
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u32 v = *ptr;
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u32 lo = v&0xF;
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u32 hi = (v >> 4)&0xF;
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f32 advance = metrics.byte_sub_advances[0];
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layout_write(arena, &list, index, '\\', 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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advance = metrics.byte_sub_advances[1];
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layout_write(arena, &list, index, integer_symbols[hi], 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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advance = metrics.byte_sub_advances[2];
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layout_write(arena, &list, index, integer_symbols[lo], 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x = next_x;
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ptr += 1;
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index += 1;
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first_of_the_line = false;
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}break;
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}
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prev_did_emit_newline = false;
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if (emit_newline){
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f32 next_x = p.x + space_advance;
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layout_write(arena, &list, newline_character_index, ' ', 0,
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Rf32(p, V2f32(next_x, text_y)));
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p.y = line_y;
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p.x = 0.f;
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line_y += line_height;
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text_y = line_y + line_to_text_shift;
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first_of_the_line = true;
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prev_did_emit_newline = true;
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}
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}
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if (!prev_did_emit_newline){
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f32 next_x = p.x + space_advance;
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layout_write(arena, &list, index, ' ', 0,
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Rf32(p, V2f32(next_x, text_y)));
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}
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}
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list.bottom_extension = -line_to_text_shift;
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list.height += list.bottom_extension;
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return(list);
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}
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function Layout_Item_List
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layout_wrap_whitespace(Application_Links *app, Arena *arena, Buffer_ID buffer,
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Range_i64 range, Face_ID face, f32 width){
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Scratch_Block scratch(app);
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Layout_Item_List list = {};
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list.index_range.first = range.first;
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list.index_range.one_past_last = range.first - 1;
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String_Const_u8 text = push_buffer_range(app, scratch, buffer, range);
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Face_Advance_Map advance_map = get_face_advance_map(app, face);
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Face_Metrics metrics = get_face_metrics(app, face);
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f32 line_height = metrics.line_height;
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f32 text_height = metrics.text_height;
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f32 line_to_text_shift = text_height - line_height;
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f32 space_advance = metrics.space_advance;
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if (text.size == 0){
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f32 next_x = space_advance;
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layout_write(arena, &list, range.first, ' ', 0,
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Rf32(V2(0.f, 0.f), V2f32(next_x, text_height)));
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}
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else{
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Vec2_f32 p = {};
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f32 line_y = line_height;
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f32 text_y = text_height;
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b32 first_of_the_line = true;
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b32 consuming_newline_characters = false;
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i64 newline_character_index = -1;
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b32 prev_did_emit_newline = false;
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u8 *ptr = text.str;
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u8 *end_ptr = ptr + text.size;
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u8 *word_ptr = ptr;
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if (character_is_whitespace(*ptr)){
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goto consuming_whitespace;
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}
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consuming_non_whitespace:
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consuming_newline_characters = false;
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newline_character_index = -1;
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for (;ptr <= end_ptr; ptr += 1){
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if (ptr == end_ptr || character_is_whitespace(*ptr)){
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break;
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}
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}
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{
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String_Const_u8 word = SCu8(word_ptr, ptr);
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u8 *word_end = ptr;
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if (!first_of_the_line){
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f32 total_advance = 0.f;
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ptr = word.str;
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for (; ptr < word_end;){
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Character_Consume_Result consume =
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utf8_consume(ptr, (umem)(word_end - ptr));
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if (consume.codepoint != max_u32){
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f32 advance = font_get_glyph_advance(&advance_map, &metrics,
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consume.codepoint);
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total_advance += advance;
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}
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else{
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total_advance += metrics.byte_advance;
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}
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ptr += consume.inc;
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}
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f32 next_x = p.x + total_advance;
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if (next_x > width){
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p.y = line_y;
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p.x = 0.f;
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line_y += line_height;
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text_y = line_y + line_to_text_shift;
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next_x = total_advance;
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}
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}
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ptr = word.str;
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for (; ptr < word_end;){
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Character_Consume_Result consume =
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utf8_consume(ptr, (umem)(word_end - ptr));
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if (consume.codepoint != max_u32){
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f32 advance = font_get_glyph_advance(&advance_map, &metrics,
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consume.codepoint);
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i64 index = (i64)(ptr - text.str) + range.first;
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layout_write(arena, &list, index,
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consume.codepoint, 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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}
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else{
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u32 v = *ptr;
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u32 lo = v&0xF;
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u32 hi = (v >> 4)&0xF;
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i64 index = (i64)(ptr - text.str) + range.first;
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f32 advance = metrics.byte_sub_advances[0];
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layout_write(arena, &list, index, '\\', 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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advance = metrics.byte_sub_advances[1];
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layout_write(arena, &list, index, integer_symbols[hi], 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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advance = metrics.byte_sub_advances[2];
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layout_write(arena, &list, index, integer_symbols[lo], 0,
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Rf32(p, V2f32(p.x + advance, text_y)));
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p.x += advance;
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}
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ptr += consume.inc;
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}
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first_of_the_line = false;
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}
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consuming_whitespace:
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for (; ptr < end_ptr; ptr += 1){
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if (!character_is_whitespace(*ptr)){
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word_ptr = ptr;
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goto consuming_non_whitespace;
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}
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b32 emit_newline = false;
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switch (*ptr){
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default:
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{
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f32 advance = space_advance;
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if (*ptr == '\t'){
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advance *= 4.f;
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}
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f32 next_x = p.x + advance;
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if (!first_of_the_line && next_x > width){
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p.y = line_y;
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p.x = 0.f;
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line_y += line_height;
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text_y = line_y + line_to_text_shift;
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next_x = advance;
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}
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i64 index = (i64)(ptr - text.str) + range.first;
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layout_write(arena, &list, index,
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' ', 0,
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Rf32(p, V2f32(next_x, text_y)));
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p.x = next_x;
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first_of_the_line = false;
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}break;
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case '\r':
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{
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if (!consuming_newline_characters){
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consuming_newline_characters = true;
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newline_character_index = (i64)(ptr - text.str) + range.first;
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}
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}break;
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case '\n':
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{
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if (!consuming_newline_characters){
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consuming_newline_characters = true;
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newline_character_index = (i64)(ptr - text.str) + range.first;
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}
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emit_newline = true;
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}break;
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}
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if (emit_newline){
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f32 next_x = p.x + space_advance;
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layout_write(arena, &list, newline_character_index, ' ', 0,
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Rf32(p, V2f32(next_x, text_y)));
|
||
|
|
p.y = line_y;
|
||
|
|
p.x = 0.f;
|
||
|
|
line_y += line_height;
|
||
|
|
text_y = line_y + line_to_text_shift;
|
||
|
|
first_of_the_line = true;
|
||
|
|
}
|
||
|
|
prev_did_emit_newline = emit_newline;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!prev_did_emit_newline){
|
||
|
|
f32 next_x = p.x + space_advance;
|
||
|
|
i64 index = (i64)(ptr - text.str) + range.first;
|
||
|
|
layout_write(arena, &list, index, ' ', 0,
|
||
|
|
Rf32(p, V2f32(next_x, text_y)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
list.bottom_extension = -line_to_text_shift;
|
||
|
|
list.height += list.bottom_extension;
|
||
|
|
|
||
|
|
return(list);
|
||
|
|
}
|
||
|
|
|
||
|
|
// BOTTOM
|
||
|
|
|