tStart work on textedit - ltkx - GUI toolkit for X11 (WIP)
HTML git clone git://lumidify.org/ltkx.git
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 05e4c9d086c3db2ad726f789cee1b9f8d7ea07b9
DIR parent 93dfd2ced8dc537d2a667857f39b07bcc8307892
HTML Author: lumidify <nobody@lumidify.org>
Date: Wed, 6 May 2020 20:59:25 +0200
Start work on textedit
Diffstat:
M NOTES | 6 ++++++
M test1.c | 3 ++-
M text-hb.c | 8 +++++++-
A textedit_wip.c | 798 ++++++++++++++++++++++++++++++
A textedit_wip.h | 175 +++++++++++++++++++++++++++++++
5 files changed, 988 insertions(+), 2 deletions(-)
---
DIR diff --git a/NOTES b/NOTES
t@@ -24,3 +24,9 @@ an abstract LtkTextLine that can be rendered without
caring about such details. This would easily allow
one file for shaping with harfbuzz, one for just
using the regular kerning with stb_truetype, etc.
+
+Text editor tags (highlight, etc.) - just store in
+linked list or something similar in sorted order;
+when looping over characters to draw them, keep a
+pointer to the current tag, then change it to the
+next one if the end of its bound comes
DIR diff --git a/test1.c b/test1.c
t@@ -34,7 +34,8 @@ int main(int argc, char *argv[])
LtkButton *button3 = ltk_create_button(window1, "I'm a button!", NULL);
ltk_grid_widget(button3, grid1, 1, 0, 1, 1, LTK_STICKY_TOP | LTK_STICKY_BOTTOM | LTK_STICKY_RIGHT);
//LtkButton *button4 = ltk_create_button(window1, "I'm a button!", NULL);
- LtkButton *button4 = ltk_create_button(window1, "ہمارے بارے میں blablabla", NULL);
+ //LtkButton *button4 = ltk_create_button(window1, "ہمارے بارے میں blablabla", NULL);
+ LtkButton *button4 = ltk_create_button(window1, "پَیدایش", NULL);
ltk_grid_widget(button4, grid1, 1, 1, 1, 1, LTK_STICKY_LEFT | LTK_STICKY_BOTTOM);
ltk_mainloop();
}
DIR diff --git a/text-hb.c b/text-hb.c
t@@ -500,7 +500,7 @@ ltk_create_text_segment(LtkTextManager *tm, uint32_t *text, unsigned int len, ui
hb_direction_t dir = hb_script_get_horizontal_direction(script);
hb_buffer_set_direction(buf, dir);
hb_buffer_set_script(buf, script);
- hb_buffer_add_codepoints(buf, ts->str, len, 0, len);
+ hb_buffer_add_codepoints(buf, ts->str, len, 1, len-1);
/* According to https://harfbuzz.github.io/the-distinction-between-levels-0-and-1.html
* this should be level 1 clustering instead of level 0 */
hb_buffer_set_cluster_level(buf, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
t@@ -511,11 +511,16 @@ ltk_create_text_segment(LtkTextManager *tm, uint32_t *text, unsigned int len, ui
float scale = stbtt_ScaleForMappingEmToPixels(&font->info, size);
LtkGlyph *last_glyph = NULL;
+ /* FIXME: read https://harfbuzz.github.io/harfbuzz-hb-buffer.html#hb-glyph-position-t-struct */
+
int x_min = INT_MAX, x_max = INT_MIN, y_min = INT_MAX, y_max = INT_MIN;
int x_abs = 0, y_abs = 0, x1_abs, y1_abs, x2_abs, y2_abs;
/* magic, do not touch */
LtkGlyph *glyph;
for (int i = 0; i < text_len; i++) {
+ if (len == 7) {
+ printf("%d\n", ginf[i].cluster);
+ }
gi = &ginf[i];
gp = &gpos[i];
glyph = malloc(sizeof(LtkGlyph));
t@@ -572,6 +577,7 @@ ltk_create_text_segment(LtkTextManager *tm, uint32_t *text, unsigned int len, ui
ts->y_max = y_max;
font->refs++;
+ /* FIXME: destroy hb_buffer */
return ts;
}
DIR diff --git a/textedit_wip.c b/textedit_wip.c
t@@ -0,0 +1,798 @@
+/*
+ * This file is part of the Lumidify ToolKit (LTK)
+ * Copyright (c) 2017, 2018, 2020 lumidify <nobody@lumidify.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include "stb_truetype.h" /* http://nothings.org/stb/stb_truetype.h */
+#include <fontconfig/fontconfig.h>
+#include "khash.h"
+#include <fribidi.h>
+#include <harfbuzz/hb.h>
+#include <harfbuzz/hb-ot.h>
+#include "text-hb.h"
+#include "ltk.h"
+
+extern Ltk *ltk_global;
+
+/* These unicode routines are taken from
+ * https://github.com/JeffBezanson/cutef8 */
+
+/* is c the start of a utf8 sequence? */
+#define isutf(c) (((c)&0xC0)!=0x80)
+
+static const uint32_t offsetsFromUTF8[6] = {
+ 0x00000000UL, 0x00003080UL, 0x000E2080UL,
+ 0x03C82080UL, 0xFA082080UL, 0x82082080UL
+};
+
+/* next character without NUL character terminator */
+uint32_t u8_nextmemchar(const char *s, size_t *i)
+{
+ uint32_t ch = 0;
+ size_t sz = 0;
+ do {
+ ch <<= 6;
+ ch += (unsigned char)s[(*i)++];
+ sz++;
+ } while (!isutf(s[*i]));
+ ch -= offsetsFromUTF8[sz-1];
+
+ return ch;
+}
+
+/* number of characters in NUL-terminated string */
+size_t u8_strlen(const char *s)
+{
+ size_t count = 0;
+ size_t i = 0, lasti;
+
+ while (1) {
+ lasti = i;
+ while (s[i] > 0)
+ i++;
+ count += (i-lasti);
+ if (s[i++]==0) break;
+ (void)(isutf(s[++i]) || isutf(s[++i]) || ++i);
+ count++;
+ }
+ return count;
+}
+
+size_t u8_wc_toutf8(char *dest, uint32_t ch)
+{
+ if (ch < 0x80) {
+ dest[0] = (char)ch;
+ return 1;
+ }
+ if (ch < 0x800) {
+ dest[0] = (ch>>6) | 0xC0;
+ dest[1] = (ch & 0x3F) | 0x80;
+ return 2;
+ }
+ if (ch < 0x10000) {
+ dest[0] = (ch>>12) | 0xE0;
+ dest[1] = ((ch>>6) & 0x3F) | 0x80;
+ dest[2] = (ch & 0x3F) | 0x80;
+ return 3;
+ }
+ if (ch < 0x110000) {
+ dest[0] = (ch>>18) | 0xF0;
+ dest[1] = ((ch>>12) & 0x3F) | 0x80;
+ dest[2] = ((ch>>6) & 0x3F) | 0x80;
+ dest[3] = (ch & 0x3F) | 0x80;
+ return 4;
+ }
+ return 0;
+}
+
+LtkTextManager *
+ltk_init_text(char *font_name)
+{
+ LtkTextManager *tm = malloc(sizeof(LtkTextManager));
+ if (!tm) {
+ (void)printf("Memory exhausted when trying to create text manager.");
+ exit(1);
+ }
+ tm->font_paths = kh_init(fontid);
+ tm->font_cache = kh_init(fontstruct);
+ tm->glyph_cache = kh_init(glyphcache);
+ tm->font_id_cur = 0;
+ ltk_load_default_font(tm, font_name);
+
+ return tm;
+}
+
+void
+ltk_destroy_text_manager(LtkTextManager *tm)
+{
+ int k;
+
+ kh_destroy(fontid, tm->font_paths);
+
+ for (k = kh_begin(tm->font_cache); k != kh_end(tm->font_cache); k++) {
+ if (kh_exist(tm->font_cache, k)) {
+ ltk_destroy_font(kh_value(tm->font_cache, k));
+ }
+ }
+ kh_destroy(fontstruct, tm->font_cache);
+
+ for (k = kh_begin(tm->glyph_cache); k != kh_end(tm->glyph_cache); k++) {
+ if (kh_exist(tm->glyph_cache, k)) {
+ ltk_destroy_glyph_cache(kh_value(tm->glyph_cache, k));
+ }
+ }
+ kh_destroy(glyphcache, tm->glyph_cache);
+
+ free(tm);
+}
+
+LtkGlyphInfo *
+ltk_create_glyph_info(LtkFont *font, unsigned int id, float scale)
+{
+ LtkGlyphInfo *glyph = malloc(sizeof(LtkGlyphInfo));
+ if (!glyph) {
+ (void)printf("Out of memory!\n");
+ exit(1);
+ }
+
+ glyph->id = id;
+ glyph->refs = 0;
+ glyph->alphamap = stbtt_GetGlyphBitmap(
+ &font->info, scale, scale, id, &glyph->w,
+ &glyph->h, &glyph->xoff, &glyph->yoff
+ );
+
+ return glyph;
+}
+
+void
+ltk_destroy_glyph_info(LtkGlyphInfo *gi)
+{
+ free(gi->alphamap);
+ free(gi);
+}
+
+LtkGlyphInfo *
+ltk_get_glyph_info(LtkFont *font, unsigned int id, float scale, khash_t(glyphinfo) *cache)
+{
+ int ret;
+ khint_t k;
+ LtkGlyphInfo *glyph;
+ k = kh_get(glyphinfo, cache, id);
+ if (k == kh_end(cache)) {
+ glyph = ltk_create_glyph_info(font, id, scale);
+ /* FIXME: error checking with ret */
+ k = kh_put(glyphinfo, cache, id, &ret);
+ kh_value(cache, k) = glyph;
+ } else {
+ glyph = kh_value(cache, k);
+ }
+
+ return glyph;
+}
+
+khint_t
+ltk_create_glyph_cache(LtkTextManager *tm, uint16_t font_id, uint16_t font_size)
+{
+ khash_t(glyphinfo) *cache = kh_init(glyphinfo);
+ int ret;
+ khint_t k;
+ /* I guess I can just ignore ret for now */
+ k = kh_put(glyphcache, tm->glyph_cache, font_id << 16 + font_size, &ret);
+ kh_value(tm->glyph_cache, k) = cache;
+
+ return k;
+}
+
+void
+ltk_destroy_glyph_cache(khash_t(glyphinfo) *cache)
+{
+ int k;
+ for (k = kh_begin(cache); k != kh_end(cache); k++) {
+ if (kh_exist(cache, k)) {
+ ltk_destroy_glyph_info(kh_value(cache, k));
+ }
+ }
+ kh_destroy(glyphinfo, cache);
+}
+
+void
+ltk_load_default_font(LtkTextManager *tm, char *name)
+{
+ FcPattern *match;
+ FcResult result;
+ char *file;
+ int index;
+ uint16_t font;
+
+ tm->fcpattern = FcNameParse(name);
+ FcPatternAddString(tm->fcpattern, FC_FONTFORMAT, "truetype");
+ FcConfigSubstitute(NULL, tm->fcpattern, FcMatchPattern);
+ FcDefaultSubstitute(tm->fcpattern);
+ match = FcFontMatch(NULL, tm->fcpattern, &result);
+
+ FcPatternGetString (match, FC_FILE, 0, (FcChar8 **) &file);
+ /* FIXME: Why is index never used? This is the index within the font file,
+ so it might be important, although I'm not sure if stb_truetype even
+ supports it */
+ FcPatternGetInteger (match, FC_INDEX, 0, &index);
+
+ tm->default_font = ltk_get_font(tm, file);
+
+ FcPatternDestroy (match);
+}
+
+LtkFont *
+ltk_create_font(char *path, uint16_t id)
+{
+ long len;
+ LtkFont *font = malloc(sizeof(LtkFont));
+ if (!font) {
+ (void)fprintf(stderr, "Out of memory!\n");
+ exit(1);
+ }
+ char *contents = ltk_read_file(path, &len);
+ if (!stbtt_InitFont(&font->info, contents, 0))
+ {
+ (void)fprintf(stderr, "Failed to load font %s\n", path);
+ exit(1);
+ }
+ /* FIXME: make use of the destroy function (last argument to hb_blob_create - see hb-blob.cc in harfbuzz source) */
+ hb_blob_t *blob = hb_blob_create(contents, len, HB_MEMORY_MODE_READONLY, NULL, NULL);
+ hb_face_t *face = hb_face_create(blob, 0);
+ /* FIXME: need to use destroy function in order for the original file data to be freed? */
+ hb_blob_destroy(blob);
+ font->hb = hb_font_create(face);
+ hb_face_destroy(face);
+ hb_ot_font_set_funcs(font->hb);
+ font->id = id;
+ font->refs = 0;
+
+ return font;
+}
+
+void
+ltk_destroy_font(LtkFont *font)
+{
+ free(font->info.data);
+ hb_font_destroy(font->hb);
+ free(font);
+}
+
+uint16_t
+ltk_load_font(LtkTextManager *tm, char *path)
+{
+ LtkFont *font = ltk_create_font(path, tm->font_id_cur++);
+ int ret;
+ khint_t k;
+ /* FIXME: does kh_destroy also free these copied strings properly? */
+ char *key = strdup(path);
+ k = kh_put(fontid, tm->font_paths, key, &ret);
+ kh_value(tm->font_paths, k) = font->id;
+ k = kh_put(fontstruct, tm->font_cache, (khint_t) font->id, &ret);
+ kh_value(tm->font_cache, k) = font;
+ k = kh_get(fontid, tm->font_paths, path);
+
+ return font->id;
+}
+
+uint16_t
+ltk_get_font(LtkTextManager *tm, char *path)
+{
+ int ret;
+ khint_t k;
+ uint16_t id;
+ k = kh_get(fontid, tm->font_paths, path);
+ if (k == kh_end(tm->font_paths)) {
+ id = ltk_load_font(tm, path);
+ } else {
+ id = kh_value(tm->font_paths, k);
+ }
+
+ return id;
+}
+
+/* FIXME: allow to either use fribidi for basic shaping and don't use harfbuzz then,
+ or just use harfbuzz (then fribidi doesn't need to do any shaping) */
+LtkTextLine *
+ltk_create_text_line(LtkTextManager *tm, char *text, uint16_t fontid, uint16_t size)
+{
+ /* NOTE: This doesn't actually take fontid into account right now - should it? */
+ LtkTextLine *tl = malloc(sizeof(LtkTextLine));
+ tl->start_segment = NULL;
+ LtkTextSegment *cur_ts = NULL;
+ LtkTextSegment *new_ts = NULL;
+ uint16_t cur_font_id = fontid;
+ int k;
+ LtkFont *font;
+
+ unsigned int ulen = u8_strlen(text);
+ FriBidiChar *log_str = malloc(sizeof(FriBidiChar) * ulen);
+ size_t inc = 0;
+ for (int i = 0; i < ulen; i++) {
+ log_str[i] = u8_nextmemchar(text, &inc);
+ }
+ FriBidiCharType *pbase_dir = malloc(sizeof(FriBidiCharType) * ulen);
+ for (int i = 0; i < ulen; i++) {
+ pbase_dir[i] = FRIBIDI_TYPE_ON;
+ }
+ FriBidiChar *vis_str = malloc(sizeof(FriBidiChar) * ulen);
+ ulen = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8, text, strlen(text), log_str);
+ fribidi_log2vis(log_str, ulen, pbase_dir, vis_str, NULL, NULL, NULL);
+
+ hb_unicode_funcs_t *ufuncs = hb_unicode_funcs_get_default();
+ hb_script_t cur_script = hb_unicode_script(ufuncs, vis_str[0]);
+ hb_script_t last_script = cur_script;
+ size_t pos = 0;
+ size_t last_pos = 0;
+ size_t start_pos = 0;
+ uint32_t ch;
+
+ for (int p = 0; p <= ulen; p++) {
+ cur_script = hb_unicode_script(ufuncs, vis_str[p]);
+ if (p == ulen ||
+ (last_script != cur_script &&
+ cur_script != HB_SCRIPT_INHERITED &&
+ cur_script != HB_SCRIPT_COMMON)) {
+ FcPattern *pat = FcPatternDuplicate(tm->fcpattern);
+ FcPattern *match;
+ FcResult result;
+ FcPatternAddBool(pat, FC_SCALABLE, 1);
+ FcConfigSubstitute(NULL, pat, FcMatchPattern);
+ FcDefaultSubstitute(pat);
+ FcCharSet *cs = FcCharSetCreate();
+ for (int i = start_pos; i < p; i++) {
+ FcCharSetAddChar(cs, vis_str[i]);
+ }
+ FcPatternAddCharSet(pat, FC_CHARSET, cs);
+ match = FcFontMatch(NULL, pat, &result);
+ char *file;
+ FcPatternGetString(match, FC_FILE, 0, &file);
+ cur_font_id = ltk_get_font(tm, file);
+ k = kh_get(fontstruct, tm->font_cache, cur_font_id);
+ font = kh_value(tm->font_cache, k);
+ FcPatternDestroy(match);
+ FcPatternDestroy(pat);
+ // handle case that this is the last character
+ if (p == ulen) {
+ last_script = cur_script;
+ }
+ /* FIXME: There should be better handling for cases
+ where an error occurs while creating the segment */
+ new_ts = ltk_create_text_segment(
+ tm, vis_str + start_pos,
+ p - start_pos, cur_font_id,
+ size, last_script
+ );
+ if (!new_ts) continue;
+ new_ts->next = NULL;
+ if (!tl->start_segment) tl->start_segment = new_ts;
+ if (cur_ts) cur_ts->next = new_ts;
+ cur_ts = new_ts;
+
+ start_pos = p;
+ last_script = cur_script;
+ }
+ }
+
+ free(vis_str);
+ free(log_str);
+ free(pbase_dir);
+
+ /* calculate width of text line
+ NOTE: doesn't work with mixed horizontal and vertical text */
+ LtkTextSegment *ts = tl->start_segment;
+ int is_hor = HB_DIRECTION_IS_HORIZONTAL(ts->dir);
+ tl->y_max = tl->x_max = INT_MIN;
+ tl->y_min = tl->x_min = INT_MAX;
+ tl->w = tl->h = 0;
+ while (ts) {
+ if (HB_DIRECTION_IS_HORIZONTAL(ts->dir) != is_hor) {
+ (void)fprintf(stderr, "WARNING: mixed horizontal/vertical text is not supported; ignoring\n");
+ continue;
+ }
+ if (is_hor) {
+ if (tl->y_max < ts->y_max) {
+ tl->y_max = ts->y_max;
+ }
+ if (tl->y_min > ts->y_min) {
+ tl->y_min = ts->y_min;
+ }
+ tl->w += ts->w;
+ } else {
+ if (tl->x_max < ts->x_max) {
+ tl->x_max = ts->x_max;
+ }
+ if (tl->x_min > ts->x_min) {
+ tl->x_min = ts->x_min;
+ }
+ tl->h += ts->h;
+ }
+ ts = ts->next;
+ }
+ if (is_hor) {
+ tl->h = tl->y_max - tl->y_min;
+ } else {
+ tl->w = tl->x_max - tl->x_min;
+ }
+
+ return tl;
+}
+
+void
+ltk_destroy_text_line(LtkTextLine *tl) {
+ LtkTextSegment *last_ts;
+ LtkTextSegment *cur_ts = tl->start_segment;
+ while (cur_ts) {
+ last_ts = cur_ts;
+ cur_ts = cur_ts->next;
+ ltk_destroy_text_segment(last_ts);
+ }
+}
+
+/* FIXME: could use unsigned int for fontid and size as long as there is code to check neither of them become too large
+ -> in case I want to get rid of uint_16_t, etc. */
+LtkTextSegment *
+ltk_create_text_segment(LtkTextManager *tm, uint32_t *text, unsigned int len, uint16_t fontid, uint16_t size, hb_script_t script)
+{
+ /* (x1*, y1*): top left corner (relative to origin and absolute)
+ (x2*, y2*): bottom right corner (relative to origin and absolute) */
+ LtkFont *font;
+ khash_t(glyphinfo) *glyph_cache;
+ khint_t k;
+
+ k = kh_get(fontstruct, tm->font_cache, fontid);
+ font = kh_value(tm->font_cache, k);
+
+ uint32_t attr = fontid << 16 + size;
+ /* FIXME: turn this into ltk_get_glyph_cache */
+ k = kh_get(glyphcache, tm->glyph_cache, attr);
+ if (k == kh_end(tm->glyph_cache)) {
+ k = ltk_create_glyph_cache(tm, fontid, size);
+ }
+ glyph_cache = kh_value(tm->glyph_cache, k);
+
+ LtkTextSegment *ts = malloc(sizeof(LtkTextSegment));
+ if (!ts) {
+ (void)fprintf(stderr, "Out of memory!\n");
+ exit(1);
+ }
+ ts->str = malloc(sizeof(uint32_t) * (len + 1));
+ memcpy(ts->str, text, len * sizeof(uint32_t));
+ ts->str[len] = '\0';
+ ts->font_id = fontid;
+ ts->font_size = size;
+
+ hb_buffer_t *buf;
+ hb_glyph_info_t *ginf, *gi;
+ hb_glyph_position_t *gpos, *gp;
+ unsigned int text_len = 0;
+ if (len < 1) {
+ (void)printf("WARNING: ltk_render_text_segment: length of text is less than 1.\n");
+ return NULL;
+ }
+
+ buf = hb_buffer_create();
+ hb_direction_t dir = hb_script_get_horizontal_direction(script);
+ hb_buffer_set_direction(buf, dir);
+ hb_buffer_set_script(buf, script);
+ hb_buffer_add_codepoints(buf, ts->str, len, 0, len);
+ /* According to https://harfbuzz.github.io/the-distinction-between-levels-0-and-1.html
+ * this should be level 1 clustering instead of level 0 */
+ hb_buffer_set_cluster_level(buf, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
+ hb_shape(font->hb, buf, NULL, 0);
+ ts->dir = hb_buffer_get_direction(buf);
+ ginf = hb_buffer_get_glyph_infos(buf, &text_len);
+ gpos = hb_buffer_get_glyph_positions(buf, &text_len);
+ float scale = stbtt_ScaleForMappingEmToPixels(&font->info, size);
+ LtkGlyph *last_glyph = NULL;
+
+ int x_min = INT_MAX, x_max = INT_MIN, y_min = INT_MAX, y_max = INT_MIN;
+ int x_abs = 0, y_abs = 0, x1_abs, y1_abs, x2_abs, y2_abs;
+ /* magic, do not touch */
+ LtkGlyph *glyph;
+ for (int i = 0; i < text_len; i++) {
+ gi = &ginf[i];
+ gp = &gpos[i];
+ glyph = malloc(sizeof(LtkGlyph));
+ glyph->info = ltk_get_glyph_info(font, gi->codepoint, scale, glyph_cache);
+ glyph->info->refs++;
+ /* FIXME: round instead of just casting */
+ glyph->x_offset = (int)(gp->x_offset * scale);
+ glyph->y_offset = (int)(gp->y_offset * scale);
+ glyph->x_advance = (int)(gp->x_advance * scale);
+ glyph->y_advance = (int)(gp->y_advance * scale);
+ glyph->next = NULL;
+ if (i == 0) {
+ ts->start_glyph = glyph;
+ } else {
+ last_glyph->next = glyph;
+ }
+ last_glyph = glyph;
+
+ /* Calculate position in order to determine full size of text segment */
+ x1_abs = x_abs + glyph->info->xoff + glyph->x_offset;
+ y1_abs = y_abs + glyph->info->yoff - glyph->y_offset;
+ /* Okay, wait, so should I check if the script is horizontal, and then add
+ x_advance instead of glyph->info->w? It seems that the glyph width is
+ usually smaller than x_advance, and spaces etc. are completely lost
+ because their glyph width is 0. I have to distinguish between horizontal
+ and vertical scripts, though because to calculate the maximum y position
+ for horizontal scripts, I still need to use the glyph height since
+ y_advance doesn't really do much there. I dunno, at least *something*
+ works now... */
+ /* FIXME: THIS PROBABLY DOESN'T REALLY WORK */
+ if (HB_DIRECTION_IS_HORIZONTAL(dir)) {
+ x2_abs = x1_abs + glyph->x_advance;
+ y2_abs = y1_abs + glyph->info->h;
+ } else {
+ x2_abs = x1_abs + glyph->info->w;
+ y2_abs = y1_abs - glyph->y_advance;
+ }
+ glyph->x_abs = x1_abs;
+ glyph->y_abs = y1_abs;
+ if (x1_abs < x_min) x_min = x1_abs;
+ if (y1_abs < y_min) y_min = y1_abs;
+ if (x2_abs > x_max) x_max = x2_abs;
+ if (y2_abs > y_max) y_max = y2_abs;
+ x_abs += glyph->x_advance;
+ y_abs -= glyph->y_advance;
+ }
+ ts->start_x = -x_min;
+ ts->start_y = -y_min;
+ ts->w = x_max - x_min;
+ ts->h = y_max - y_min;
+ ts->x_min = x_min;
+ ts->y_min = y_min;
+ ts->x_max = x_max;
+ ts->y_max = y_max;
+
+ font->refs++;
+
+ return ts;
+}
+
+void
+ltk_destroy_glyph(LtkGlyph *glyph, khash_t(glyphinfo) *cache)
+{
+ int k;
+ if (--glyph->info->refs < 1) {
+ k = kh_get(glyphinfo, cache, glyph->info->id);
+ kh_del(glyphinfo, cache, k);
+ ltk_destroy_glyph_info(glyph->info);
+ }
+ free(glyph);
+}
+
+void
+ltk_destroy_text_segment(LtkTextSegment *ts)
+{
+ LtkGlyph *glyph, *next_glyph;
+ khash_t(glyphinfo) *gcache;
+ LtkFont *font;
+ int k;
+ glyph = ts->start_glyph;
+ k = kh_get(glyphinfo, ltk_global->tm->glyph_cache, ts->font_id << 16 + ts->font_size);
+ gcache = kh_value(ltk_global->tm->glyph_cache, k);
+ do {
+ next_glyph = glyph->next;
+ ltk_destroy_glyph(glyph, gcache);
+ } while (glyph = next_glyph);
+ k = kh_get(fontstruct, ltk_global->tm->font_cache, ts->font_id);
+ font = kh_value(ltk_global->tm->font_cache, k);
+ if (--font->refs < 1) {
+ kh_del(fontstruct, ltk_global->tm->font_cache, k);
+ ltk_destroy_font(font);
+ }
+ free(ts->str);
+ free(ts);
+}
+
+/* based on http://codemadness.org/git/dwm-font/file/drw.c.html#l315 */
+XImage *
+ltk_render_text_line(
+ LtkTextLine *tl,
+ Display *dpy,
+ Window window,
+ GC gc,
+ Colormap colormap,
+ XColor fg,
+ XColor bg)
+{
+ XWindowAttributes attrs;
+ XGetWindowAttributes(dpy, window, &attrs);
+ int depth = attrs.depth;
+ XImage *img = XCreateImage(dpy, CopyFromParent, depth, ZPixmap, 0, NULL, tl->w, tl->h, 32, 0);
+ img->data = calloc(img->bytes_per_line, img->height);
+ XInitImage(img);
+ int b;
+ for (int i = 0; i < tl->h; i++) {
+ b = img->bytes_per_line * i;
+ for (int j = 0; j < tl->w; j++) {
+ img->data[b++] = bg.blue / 257;
+ img->data[b++] = bg.green / 257;
+ img->data[b++] = bg.red / 257;
+ b++;
+ }
+ }
+
+ LtkTextSegment *ts = tl->start_segment;
+ int x = 0;
+ int y = 0;
+ int is_hor = HB_DIRECTION_IS_HORIZONTAL(ts->dir);
+ do {
+ if (is_hor) {
+ y = tl->h - tl->y_max;
+ ltk_render_text_segment(ts, x + ts->start_x, y, img, fg);
+ x += ts->w;
+ } else {
+ x = tl->w - tl->x_max;
+ ltk_render_text_segment(ts, x, y + ts->start_y, img, fg);
+ y += ts->h;
+ }
+ } while (ts = ts->next);
+
+ return img;
+}
+
+void
+ltk_render_text_segment(
+ LtkTextSegment *ts,
+ unsigned int start_x,
+ unsigned int start_y,
+ XImage *img,
+ XColor fg)
+{
+ LtkGlyph *glyph = ts->start_glyph;
+ int x_cur = start_x;
+ int y_cur = start_y;
+ int x, y;
+ double a;
+ int b;
+ do {
+ x = x_cur + glyph->info->xoff + glyph->x_offset;
+ y = y_cur + glyph->info->yoff - glyph->y_offset;
+ for (int i = 0; i < glyph->info->h; i++) {
+ for (int j = 0; j < glyph->info->w; j++) {
+ b = (y + i) * img->bytes_per_line + (x + j) * 4;
+ a = glyph->info->alphamap[i * glyph->info->w + j] / 255.0;
+ img->data[b] = (fg.blue * a + (1 - a) * (uint16_t)img->data[b] * 257) / 257;
+ img->data[b + 1] = (fg.green * a + (1 - a) * (uint16_t)img->data[b + 1] * 257) / 257;
+ img->data[b + 2] = (fg.red * a + (1 - a) * (uint16_t)img->data[b + 2] * 257) / 257;
+ }
+ }
+ x_cur += glyph->x_advance;
+ y_cur -= glyph->y_advance;
+ } while (glyph = glyph->next);
+}
+
+/*
+Notes: When inserting a character, check what the direction of the surrounding
+script is - if it is the same (or a weak direction), then just insert the char
+without re-doing the bidi algorithm. Only redo the whole line/paragraph is the
+dir of the inserted character is different. Assume the text is LTR until a strong
+character is inserted, i.e. the line should keep a flag if it already has a strong
+dir set.
+When reordering, the cursor needs to be kept in the right place:
+a) The logical to visual mapping from FriBidi needs to be used to find the position
+of the cursor in the text that gets passed to Harfbuzz.
+b) The cluster values from Harfbuzz need to be used to figure out where the cursor
+is on the screen.
+Harfbuzz also should be given some context - maybe even completely reshape the
+text until the last and next space? That would only be a problem with weird very
+long words (mainly nonsense). At least maybe take up to five or so chars on each
+side and pass even more with the optional context-passing feature for hb_shape.
+Question: Does both the logical and visual text need to be stored? The logical text
+is technically the master copy, but the visual text is what gets passed to harfbuzz.
+-> Actually, since the visual text has to be split into script runs anyways, maybe
+just append text to that (and also add it to the master buffer simultaneously). As
+soon as a different script is inserted, everything has to be redone anyways. Also,
+when reshaping with context, only the text in the current run has to be passed at all.
+*/
+
+struct ltk_gap_buffer *
+ltk_gap_buffer_create(void) {
+ struct ltk_gap_buffer *gb = malloc(sizeof(struct ltk_gap_buffer));
+ if (!gb)
+ goto error;
+ gb->buf = malloc(4 * sizeof(uint32_t));
+ if (!gb->buf)
+ goto error;
+ gb->buf_size = 8;
+ gb->gap_left = 0;
+ gb->gap_size = 8;
+ gb->gap_end_left = 8;
+ return gb;
+error:
+ (void)fprintf(stderr, "Out of memory while trying to allocate gap buffer\n");
+ exit(1);
+}
+
+void
+ltk_gap_buffer_resize_gap(struct ltk_gap_buffer *gb, int len) {
+ /* FIXME: Should this use realloc? It's usually more efficient, but
+ in this case, I would still need to copy the part after the gap
+ manually, so it could potentially be copied twice, which really
+ wouldn't be good. Maybe use realloc if only a small part is after
+ the gap and just regular malloc otherwise? */
+ int new_size = gb->buf_size - gb->gap-size + len;
+ struct ltk_gap_buffer *new = malloc(new_size * sizeof(uint32_t));
+ if (!new) {
+ (void)fprintf(stderr, "Out of memory while trying to resize gap buffer\n");
+ exit(1);
+ }
+ for (int i = 0; i < gb->gap_left; i++) {
+ new[i] = gb->buf[i];
+ }
+ for (int i = gb->gap_left + gb->gap_size; i < gb->gap_end_left) {
+ new[i - gb->gap_size + len] = gb->buf[i];
+ }
+ free(gb->buf);
+ gb->buf = new;
+}
+
+void
+ltk_gap_buffer_insert(struct ltk_gap_buffer *gb, uint32_t *new, size_t start, size_t len) {
+ if (gb->gap_size < len)
+ ltk_gap_buffer_resize_gap(gb, len + 8);
+ for (int i = 0; i < len; i++) {
+ gb->buf[gb->gap_left + i] = new[start + i];
+ }
+ gb->gap_left = gb->gap_left + len;
+ gb->gap_size -= len;
+}
+
+void
+ltk_gap_buffer_insert_single(struct ltk_gap_buffer *gb, uint32_t new) {
+ ltk_gap_buffer_insert(gb, &new, 0, 1);
+}
+
+void
+ltk_gap_buffer_move_gap(struct ltk_gap_buffer *gb, size_t pos) {
+ if (pos == gb->gap_left)
+ return;
+ if (pos < 0 || pos >= gb->gap_end_left - gb->gap_size) {
+ (void)fprintf(stderr, "Index out of range while moving gap buffer gap\n");
+ return;
+ }
+ if (pos >= gb->gap_left) {
+ for (int i = gb->gap_left; i < pos) {
+ gb->buf[i] = gb->buf[i + gb->gap_size];
+ }
+ } else {
+ for (int i = gb->gap_left - 1; i >= pos; i--) {
+ gb->buf[i + gb->gap_size] = gb->buf[i];
+ }
+ }
+ gb->gap_left = pos;
+}
+
+void
+ltk_gap_buffer_destroy(struct ltk_gap_buffer *gb) {
+ free(gb->buf);
+ free(gb);
+}
DIR diff --git a/textedit_wip.h b/textedit_wip.h
t@@ -0,0 +1,175 @@
+/*
+ * This file is part of the Lumidify ToolKit (LTK)
+ * Copyright (c) 2017, 2018, 2020 lumidify <nobody@lumidify.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _TEXT_HB_H_
+#define _TEXT_HB_H_
+
+/*
+Requires the following includes:
+<X11/Xlib.h>, <X11/Xutil.h>, "stb_truetype.h",
+"khash.h", <harfbuzz/hb.h>, <fribidi.h>,
+<fontconfig/fontconfig.h>
+*/
+
+/* Contains glyph info specific to one run of text */
+typedef struct ltk_glyph {
+ LtkGlyphInfo *info;
+ int x_offset; /* additional x offset given by harfbuzz */
+ int y_offset; /* additional y offset given by harfbuzz */
+ int x_advance;
+ int y_advance;
+ int x_abs;
+ int y_abs;
+ uint32_t cluster; /* index of char in original text - from harfbuzz */
+};
+
+struct ltk_gap_buffer {
+ uint32_t *buf;
+ size_t buf_size;
+ size_t gap_left;
+ size_t gap_size;
+ size_t gap_end_left;
+};
+
+struct ltk_text_buffer {
+ uint32_t *buffer;
+ struct ltk_glyph *glyphs;
+ size_t buf_size;
+ size_t buf_left;
+ size_t buf_gap_size;
+ size_t glyphs_size;
+ size_t glyphs_left;
+ size_t glyphs_gap_size;
+};
+
+typedef struct {
+ stbtt_fontinfo info;
+ hb_font_t *hb;
+ uint16_t id;
+ unsigned int refs;
+} LtkFont;
+
+/* Contains general info on glyphs that doesn't change regardless of the context */
+typedef struct _LtkGlyphInfo {
+ unsigned int id;
+ unsigned char *alphamap;
+ unsigned int w;
+ unsigned int h;
+ unsigned int xoff; /* x offset from origin to top left corner of glyph */
+ unsigned int yoff; /* y offset from origin to top left corner of glyph */
+ unsigned int refs;
+ /* FIXME: does refs need to be long? It could cause problems if a
+ program tries to cache/"keep alive" a lot of pages of text. */
+} LtkGlyphInfo;
+
+/* Single segment of text with same font */
+typedef struct LtkTextSegment {
+ uint16_t font_id;
+ uint16_t font_size;
+ unsigned int w;
+ unsigned int h;
+ int start_x;
+ int start_y;
+ int x_min;
+ int y_min;
+ int x_max;
+ int y_max;
+ hb_direction_t dir;
+ uint32_t *str;
+ LtkGlyph *start_glyph;
+ struct LtkTextSegment *next;
+} LtkTextSegment;
+
+/* Single line of text */
+typedef struct {
+ unsigned int w;
+ unsigned int h;
+ int x_max;
+ int x_min;
+ int y_max;
+ int y_min;
+ FriBidiParType dir;
+ LtkTextSegment *start_segment;
+} LtkTextLine;
+
+/* Hash definitions */
+/* glyph id -> glyph info struct */
+KHASH_MAP_INIT_INT(glyphinfo, LtkGlyphInfo*)
+/* font path, size -> glyph cache hash */
+KHASH_MAP_INIT_INT(glyphcache, khash_t(glyphinfo)*)
+/* font path -> font id */
+KHASH_MAP_INIT_STR(fontid, uint16_t)
+/* font id -> font struct */
+KHASH_MAP_INIT_INT(fontstruct, LtkFont*)
+
+typedef struct LtkTextManager {
+ khash_t(fontid) *font_paths;
+ khash_t(fontstruct) *font_cache;
+ khash_t(glyphcache) *glyph_cache;
+ FcPattern *fcpattern;
+ uint16_t default_font;
+ uint16_t font_id_cur;
+} LtkTextManager;
+
+LtkTextManager *ltk_init_text(char *font_name);
+
+void ltk_destroy_text_manager(LtkTextManager *tm);
+
+LtkGlyphInfo *ltk_create_glyph_info(LtkFont *font, unsigned int id, float scale);
+
+void ltk_destroy_glyph_info(LtkGlyphInfo *gi);
+
+LtkGlyphInfo *ltk_get_glyph_info(LtkFont *font, unsigned int id, float scale, khash_t(glyphinfo) *cache);
+
+khint_t ltk_create_glyph_cache(LtkTextManager *tm, uint16_t font_id, uint16_t font_size);
+
+void ltk_destroy_glyph_cache(khash_t(glyphinfo) *cache);
+
+void ltk_load_default_font(LtkTextManager *tm, char *name);
+
+LtkFont *ltk_create_font(char *path, uint16_t id);
+
+void ltk_destroy_font(LtkFont *font);
+
+/* FIXME: need to figure out how exactly the whole font system is going to work, especially with default fonts, etc. */
+uint16_t ltk_load_font(LtkTextManager *tm, char *path);
+
+uint16_t ltk_get_font(LtkTextManager *tm, char *path);
+
+/* TODO: different sizes, colors, styles, etc. */
+LtkTextLine *ltk_create_text_line(LtkTextManager *tm, char *text, uint16_t fontid, uint16_t size);
+
+/* FIXME: could use unsigned int for fontid and size as long as there is code to check neither of them become too large
+ -> in case I want to get rid of uint_16_t, etc. */
+LtkTextSegment *ltk_create_text_segment(LtkTextManager *tm, uint32_t *text, unsigned int text_len, uint16_t fontid, uint16_t size, hb_script_t script);
+
+void ltk_destroy_glyph(LtkGlyph *glyph, khash_t(glyphinfo) *cache);
+
+void ltk_destroy_text_segment(LtkTextSegment *ts);
+
+XImage *ltk_render_text_line(LtkTextLine *tl, Display *dpy, Window window, GC gc, Colormap colormap, XColor fg, XColor bg);
+
+void ltk_render_text_segment(LtkTextSegment *ts, unsigned int start_x, unsigned int start_y, XImage *img, XColor fg);
+
+
+#endif