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311
drwl.h
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311
drwl.h
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/*
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* drwl - https://codeberg.org/sewn/drwl
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*
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* Copyright (c) 2023-2024 sewn <sewn@disroot.org>
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* Copyright (c) 2024 notchoc <notchoc@disroot.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The UTF-8 Decoder included is from Bjoern Hoehrmann:
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* Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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* See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
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*/
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#pragma once
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#include <stdlib.h>
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#include <fcft/fcft.h>
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#include <pixman-1/pixman.h>
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enum { ColFg, ColBg, ColBorder }; /* colorscheme index */
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typedef struct fcft_font Fnt;
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typedef pixman_image_t Img;
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typedef struct {
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Img *image;
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Fnt *font;
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uint32_t *scheme;
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} Drwl;
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#define UTF8_ACCEPT 0
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#define UTF8_REJECT 12
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#define UTF8_INVALID 0xFFFD
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static const uint8_t utf8d[] = {
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
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0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
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12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
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12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
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12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
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12,36,12,12,12,12,12,12,12,12,12,12,
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};
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static inline uint32_t
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utf8decode(uint32_t *state, uint32_t *codep, uint8_t byte)
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{
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uint32_t type = utf8d[byte];
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*codep = (*state != UTF8_ACCEPT) ?
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(byte & 0x3fu) | (*codep << 6) :
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(0xff >> type) & (byte);
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*state = utf8d[256 + *state + type];
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return *state;
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}
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static int
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drwl_init(void)
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{
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fcft_set_scaling_filter(FCFT_SCALING_FILTER_LANCZOS3);
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return fcft_init(FCFT_LOG_COLORIZE_AUTO, 0, FCFT_LOG_CLASS_ERROR);
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}
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static Drwl *
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drwl_create(void)
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{
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Drwl *drwl;
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if (!(drwl = calloc(1, sizeof(Drwl))))
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return NULL;
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return drwl;
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}
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static void
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drwl_setfont(Drwl *drwl, Fnt *font)
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{
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if (drwl)
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drwl->font = font;
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}
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static void
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drwl_setimage(Drwl *drwl, Img *image)
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{
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if (drwl)
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drwl->image = image;
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}
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static Fnt *
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drwl_font_create(Drwl *drwl, size_t count,
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const char *names[static count], const char *attributes)
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{
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Fnt *font = fcft_from_name(count, names, attributes);
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if (drwl)
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drwl_setfont(drwl, font);
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return font;
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}
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static void
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drwl_font_destroy(Fnt *font)
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{
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fcft_destroy(font);
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}
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static inline pixman_color_t
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convert_color(uint32_t clr)
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{
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return (pixman_color_t){
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((clr >> 24) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
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((clr >> 16) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
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((clr >> 8) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
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(clr & 0xFF) * 0x101
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};
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}
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static void
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drwl_setscheme(Drwl *drwl, uint32_t *scm)
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{
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if (drwl)
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drwl->scheme = scm;
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}
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static Img *
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drwl_image_create(Drwl *drwl, unsigned int w, unsigned int h, uint32_t *bits)
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{
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Img *image;
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pixman_region32_t clip;
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image = pixman_image_create_bits_no_clear(
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PIXMAN_a8r8g8b8, w, h, bits, w * 4);
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if (!image)
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return NULL;
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pixman_region32_init_rect(&clip, 0, 0, w, h);
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pixman_image_set_clip_region32(image, &clip);
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pixman_region32_fini(&clip);
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if (drwl)
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drwl_setimage(drwl, image);
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return image;
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}
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static void
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drwl_rect(Drwl *drwl,
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int x, int y, unsigned int w, unsigned int h,
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int filled, int invert)
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{
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pixman_color_t clr;
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if (!drwl || !drwl->scheme || !drwl->image)
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return;
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clr = convert_color(drwl->scheme[invert ? ColBg : ColFg]);
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if (filled)
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pixman_image_fill_rectangles(PIXMAN_OP_SRC, drwl->image, &clr, 1,
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&(pixman_rectangle16_t){x, y, w, h});
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else
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pixman_image_fill_rectangles(PIXMAN_OP_SRC, drwl->image, &clr, 4,
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(pixman_rectangle16_t[4]){
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{ x, y, w, 1 },
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{ x, y + h - 1, w, 1 },
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{ x, y, 1, h },
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{ x + w - 1, y, 1, h }});
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}
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static int
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drwl_text(Drwl *drwl,
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int x, int y, unsigned int w, unsigned int h,
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unsigned int lpad, const char *text, int invert)
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{
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int ty;
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int render = x || y || w || h;
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long x_kern;
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uint32_t cp = 0, last_cp = 0, state;
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pixman_color_t clr;
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pixman_image_t *fg_pix = NULL;
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int noellipsis = 0;
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const struct fcft_glyph *glyph, *eg = NULL;
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int fcft_subpixel_mode = FCFT_SUBPIXEL_DEFAULT;
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if (!drwl || (render && (!drwl->scheme || !w || !drwl->image)) || !text || !drwl->font)
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return 0;
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if (!render) {
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w = invert ? invert : ~invert;
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} else {
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clr = convert_color(drwl->scheme[invert ? ColBg : ColFg]);
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fg_pix = pixman_image_create_solid_fill(&clr);
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drwl_rect(drwl, x, y, w, h, 1, !invert);
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x += lpad;
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w -= lpad;
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}
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if (render && (drwl->scheme[ColBg] & 0xFF) != 0xFF)
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fcft_subpixel_mode = FCFT_SUBPIXEL_NONE;
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if (render)
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eg = fcft_rasterize_char_utf32(drwl->font, 0x2026 /* … */, fcft_subpixel_mode);
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for (const char *p = text, *pp; pp = p, *p; p++) {
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for (state = UTF8_ACCEPT; *p &&
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utf8decode(&state, &cp, *p) > UTF8_REJECT; p++)
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;
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if (!*p || state == UTF8_REJECT) {
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cp = UTF8_INVALID;
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if (p > pp)
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p--;
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}
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glyph = fcft_rasterize_char_utf32(drwl->font, cp, fcft_subpixel_mode);
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if (!glyph)
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continue;
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x_kern = 0;
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if (last_cp)
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fcft_kerning(drwl->font, last_cp, cp, &x_kern, NULL);
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last_cp = cp;
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ty = y + (h - drwl->font->height) / 2 + drwl->font->ascent;
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if (render && !noellipsis && x_kern + glyph->advance.x + eg->advance.x > w &&
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*(p + 1) != '\0') {
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/* cannot fit ellipsis after current codepoint */
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if (drwl_text(drwl, 0, 0, 0, 0, 0, pp, 0) + x_kern <= w) {
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noellipsis = 1;
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} else {
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w -= eg->advance.x;
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pixman_image_composite32(
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PIXMAN_OP_OVER, fg_pix, eg->pix, drwl->image, 0, 0, 0, 0,
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x + eg->x, ty - eg->y, eg->width, eg->height);
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}
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}
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if ((x_kern + glyph->advance.x) > w)
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break;
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x += x_kern;
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if (render && pixman_image_get_format(glyph->pix) == PIXMAN_a8r8g8b8)
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/* pre-rendered glyphs (eg. emoji) */
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pixman_image_composite32(
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PIXMAN_OP_OVER, glyph->pix, NULL, drwl->image, 0, 0, 0, 0,
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x + glyph->x, ty - glyph->y, glyph->width, glyph->height);
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else if (render)
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pixman_image_composite32(
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PIXMAN_OP_OVER, fg_pix, glyph->pix, drwl->image, 0, 0, 0, 0,
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x + glyph->x, ty - glyph->y, glyph->width, glyph->height);
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x += glyph->advance.x;
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w -= glyph->advance.x;
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}
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if (render)
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pixman_image_unref(fg_pix);
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return x + (render ? w : 0);
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}
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static unsigned int
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drwl_font_getwidth(Drwl *drwl, const char *text)
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{
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if (!drwl || !drwl->font || !text)
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return 0;
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return drwl_text(drwl, 0, 0, 0, 0, 0, text, 0);
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}
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static void
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drwl_image_destroy(Img *image)
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{
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pixman_image_unref(image);
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}
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static void
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drwl_destroy(Drwl *drwl)
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{
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if (drwl->font)
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drwl_font_destroy(drwl->font);
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if (drwl->image)
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drwl_image_destroy(drwl->image);
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free(drwl);
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}
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static void
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drwl_fini(void)
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{
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fcft_fini();
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}
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