4coder/buffer/4coder_shared.cpp

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2015-10-24 22:14:33 +00:00
/*
* Mr. 4th Dimention - Allen Webster
* Four Tech
*
* public domain -- no warranty is offered or implied; use this code at your own risk
*
* 23.10.2015
*
* Items shared by gap buffer types
*
*/
// TOP
#ifndef defines_4tech
#define inline_4tech inline
#define internal_4tech static
#define memset_4tech memset
#define memcpy_4tech memcpy
#define memmove_4tech memmove
#define defines_4tech 1
#define debug_4tech(x) x
#define assert_4tech assert
#define ceil_4tech CEIL32
#endif
inline_4tech float
measure_character(void *advance_data, int stride, char character){
char *advances;
float width;
advances = (char*)advance_data;
switch (character){
case 0: width = *(float*)(advances + stride * '\\') + *(float*)(advances + stride * '0'); break;
case '\n': width = 0; break;
case '\r': width = *(float*)(advances + stride * '\\') + *(float*)(advances + stride * '\r'); break;
default: width = *(float*)(advances + stride * character);
}
return(width);
}
typedef struct{
int str_start, len;
int start, end;
} Buffer_Edit;
typedef enum{
buffer_seek_pos,
buffer_seek_wrapped_xy,
buffer_seek_unwrapped_xy,
buffer_seek_line_char
} Buffer_Seek_Type;
typedef struct{
Buffer_Seek_Type type;
union{
struct { int pos; };
struct { int round_down; float x, y; };
struct { int line, character; };
};
} Buffer_Seek;
inline_4tech Buffer_Seek
seek_pos(int pos){
Buffer_Seek result;
result.type = buffer_seek_pos;
result.pos = pos;
return(result);
}
inline_4tech Buffer_Seek
seek_wrapped_xy(float x, float y, int round_down){
Buffer_Seek result;
result.type = buffer_seek_wrapped_xy;
result.x = x;
result.y = y;
result.round_down = round_down;
return(result);
}
inline_4tech Buffer_Seek
seek_unwrapped_xy(float x, float y, int round_down){
Buffer_Seek result;
result.type = buffer_seek_unwrapped_xy;
result.x = x;
result.y = y;
result.round_down = round_down;
return(result);
}
inline_4tech Buffer_Seek
seek_line_char(int line, int character){
Buffer_Seek result;
result.type = buffer_seek_line_char;
result.line = line;
result.character = character;
return(result);
}
typedef struct{
int pos;
int line, character;
float unwrapped_x, unwrapped_y;
float wrapped_x, wrapped_y;
} Full_Cursor;
typedef struct{
int index;
int glyphid;
float x0, y0;
float x1, y1;
} Buffer_Render_Item;
inline_4tech void
write_render_item(Buffer_Render_Item *item, int index, int glyphid,
float x, float y, float w, float h){
item->index = index;
item->glyphid = glyphid;
item->x0 = x;
item->y0 = y;
item->x1 = x + w;
item->y1 = y + h;
}
inline_4tech float
write_render_item_inline(Buffer_Render_Item *item, int index, int glyphid,
float x, float y, void *advance_data, int stride, float h){
float ch_width;
ch_width = measure_character(advance_data, stride, (char)glyphid);
write_render_item(item, index, glyphid, x, y, ch_width, h);
return(ch_width);
}
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inline_4tech Full_Cursor
make_cursor_hint(int line_index, int *starts, float *wrap_ys, float font_height){
Full_Cursor hint;
hint.pos = starts[line_index];
hint.line = line_index + 1;
hint.character = 1;
hint.unwrapped_y = (f32)(line_index * font_height);
hint.unwrapped_x = 0;
hint.wrapped_y = wrap_ys[line_index];
hint.wrapped_x = 0;
return(hint);
}
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typedef struct{
Full_Cursor cursor, prev_cursor;
} Seek_State;
internal_4tech int
cursor_seek_step(Seek_State *state, Buffer_Seek seek, int xy_seek, float max_width, float font_height,
char *advances, int stride, int size, char ch){
Full_Cursor cursor, prev_cursor;
float ch_width;
int result;
float x, px, y;
cursor = state->cursor;
prev_cursor = state->prev_cursor;
result = 1;
prev_cursor = cursor;
switch (ch){
case '\n':
++cursor.line;
cursor.unwrapped_y += font_height;
cursor.wrapped_y += font_height;
cursor.character = 1;
cursor.unwrapped_x = 0;
cursor.wrapped_x = 0;
break;
default:
++cursor.character;
if (ch == '\r') ch_width = *(float*)(advances + stride * '\\') + *(float*)(advances + stride * 'r');
else ch_width = *(float*)(advances + stride * ch);
if (cursor.wrapped_x + ch_width >= max_width){
cursor.wrapped_y += font_height;
cursor.wrapped_x = 0;
prev_cursor = cursor;
}
cursor.unwrapped_x += ch_width;
cursor.wrapped_x += ch_width;
break;
}
++cursor.pos;
if (cursor.pos > size){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
x = y = px = 0;
switch (seek.type){
case buffer_seek_pos:
if (cursor.pos > seek.pos){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
case buffer_seek_wrapped_xy:
x = cursor.wrapped_x; px = prev_cursor.wrapped_x;
y = cursor.wrapped_y; break;
case buffer_seek_unwrapped_xy:
x = cursor.unwrapped_x; px = prev_cursor.unwrapped_x;
y = cursor.unwrapped_y; break;
case buffer_seek_line_char:
if (cursor.line == seek.line && cursor.character >= seek.character){
result = 0;
goto cursor_seek_step_end;
}
else if (cursor.line > seek.line){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
}
if (xy_seek){
if (y > seek.y){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (y > seek.y - font_height && x >= seek.x){
if (!seek.round_down){
if (ch != '\n' && (seek.x - px) < (x - seek.x)) cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (x > seek.x){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
}
}
cursor_seek_step_end:
state->cursor = cursor;
state->prev_cursor = prev_cursor;
return(result);
}
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typedef struct{
int pos, index;
} Cursor_With_Index;
inline_4tech void
write_cursor_with_index(Cursor_With_Index *positions, int *count, int pos){
positions[*count].index = *count;
positions[*count].pos = pos;
++*count;
}
#define CursorSwap__(a,b) { Cursor_With_Index t = a; a = b; b = t; }
internal_4tech void
buffer_quick_sort_cursors(Cursor_With_Index *positions, int start, int pivot){
int i, mid;
int pivot_pos;
mid = start;
pivot_pos = positions[pivot].pos;
for (i = mid; i < pivot; ++i){
if (positions[i].pos < pivot_pos){
CursorSwap__(positions[mid], positions[i]);
++mid;
}
}
CursorSwap__(positions[mid], positions[pivot]);
if (start < mid - 1) buffer_quick_sort_cursors(positions, start, mid - 1);
if (mid + 1 < pivot) buffer_quick_sort_cursors(positions, mid + 1, pivot);
}
internal_4tech void
buffer_quick_unsort_cursors(Cursor_With_Index *positions, int start, int pivot){
int i, mid;
int pivot_index;
mid = start;
pivot_index = positions[pivot].index;
for (i = mid; i < pivot; ++i){
if (positions[i].index < pivot_index){
CursorSwap__(positions[mid], positions[i]);
++mid;
}
}
CursorSwap__(positions[mid], positions[pivot]);
if (start < mid - 1) buffer_quick_unsort_cursors(positions, start, mid - 1);
if (mid + 1 < pivot) buffer_quick_unsort_cursors(positions, mid + 1, pivot);
}
#undef CursorSwap__
inline_4tech void
buffer_sort_cursors(Cursor_With_Index *positions, int count){
assert_4tech(count > 0);
buffer_quick_sort_cursors(positions, 0, count-1);
}
inline_4tech void
buffer_unsort_cursors(Cursor_With_Index *positions, int count){
assert_4tech(count > 0);
buffer_quick_unsort_cursors(positions, 0, count-1);
}
internal_4tech void
buffer_update_cursors(Cursor_With_Index *sorted_positions, int count, int start, int end, int len){
Cursor_With_Index *position;
int shift_amount;
shift_amount = (len - (end - start));
position = sorted_positions + count - 1;
for (; position >= sorted_positions && position->pos >= end; --position) position->pos += shift_amount;
for (; position >= sorted_positions && position->pos >= start; --position) position->pos = start;
}
internal_4tech int
buffer_batch_debug_sort_check(Buffer_Edit *sorted_edits, int edit_count){
Buffer_Edit *edit;
int i, result, start_point;
result = 1;
start_point = 0;
edit = sorted_edits;
for (i = 0; i < edit_count; ++i, ++edit){
if (start_point > edit->start){
result = 0; break;
}
start_point = (edit->end < edit->start + 1)?edit->start + 1:edit->end;
}
return(result);
}
internal_4tech int
buffer_batch_edit_max_shift(Buffer_Edit *sorted_edits, int edit_count){
Buffer_Edit *edit;
int i, result;
int shift_total, shift_max;
result = 0;
shift_total = 0;
shift_max = 0;
edit = sorted_edits;
for (i = 0; i < edit_count; ++i, ++edit){
shift_total += (edit->len - (edit->end - edit->start));
if (shift_total > shift_max) shift_max = shift_total;
}
return(shift_max);
}
internal_4tech void
buffer_batch_edit_update_cursors(Cursor_With_Index *sorted_positions, int count, Buffer_Edit *sorted_edits, int edit_count){
Cursor_With_Index *position, *end_position;
Buffer_Edit *edit, *end_edit;
int start, end;
int shift_amount;
position = sorted_positions;
end_position = sorted_positions + count;
edit = sorted_edits;
end_edit = sorted_edits + edit_count;
shift_amount = 0;
for (; edit < end_edit && position < end_position; ++edit){
start = edit->start;
end = edit->end;
for (; position->pos < start && position < end_position; ++position){
position->pos += shift_amount;
}
for (; position->pos < end && position < end_position; ++position){
position->pos = start + shift_amount;
}
shift_amount += (edit->len - (end - start));
}
for (; position < end_position; ++position){
position->pos += shift_amount;
}
}
internal_4tech int
eol_convert_in(char *data, int size){
int i;
for (i = 0; i < size; ++i){
if (data[i] == '\r' && data[i+1] == '\n'){
memmove_4tech(data + i, data + i + 1, size - i);
size -= 1;
}
}
return(size);
}
internal_4tech int
eol_convert_out(char *data, int size, int max, int *size_out){
int result;
int i;
// TODO(allen): iterative memory check
result = 1;
i = 0;
for (; i < size; ++i){
if (data[i] == '\n'){
memmove_4tech(data + i + 1, data + i, size - i);
data[i] = '\r';
++i;
++size;
}
}
*size_out = size;
return(result);
}
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inline_4tech int
is_whitespace(char c){
int result;
result = (c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == '\f' || c == '\v');
return(result);
}
// BOTTOM