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dwl/drwl.h
Zynh Ludwig dc6f1cab59 bar patch
2024-12-13 04:48:08 -08:00

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/*
* drwl - https://codeberg.org/sewn/drwl
*
* Copyright (c) 2023-2024 sewn <sewn@disroot.org>
* Copyright (c) 2024 notchoc <notchoc@disroot.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.
*
* The UTF-8 Decoder included is from Bjoern Hoehrmann:
* Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
* See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
*/
#pragma once
#include <stdlib.h>
#include <fcft/fcft.h>
#include <pixman-1/pixman.h>
enum { ColFg, ColBg, ColBorder }; /* colorscheme index */
typedef struct fcft_font Fnt;
typedef pixman_image_t Img;
typedef struct {
Img *image;
Fnt *font;
uint32_t *scheme;
} Drwl;
#define UTF8_ACCEPT 0
#define UTF8_REJECT 12
#define UTF8_INVALID 0xFFFD
static const uint8_t utf8d[] = {
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,
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,
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,
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,
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,
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,
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,
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,
0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
12,36,12,12,12,12,12,12,12,12,12,12,
};
static inline uint32_t
utf8decode(uint32_t *state, uint32_t *codep, uint8_t byte)
{
uint32_t type = utf8d[byte];
*codep = (*state != UTF8_ACCEPT) ?
(byte & 0x3fu) | (*codep << 6) :
(0xff >> type) & (byte);
*state = utf8d[256 + *state + type];
return *state;
}
static int
drwl_init(void)
{
fcft_set_scaling_filter(FCFT_SCALING_FILTER_LANCZOS3);
return fcft_init(FCFT_LOG_COLORIZE_AUTO, 0, FCFT_LOG_CLASS_ERROR);
}
static Drwl *
drwl_create(void)
{
Drwl *drwl;
if (!(drwl = calloc(1, sizeof(Drwl))))
return NULL;
return drwl;
}
static void
drwl_setfont(Drwl *drwl, Fnt *font)
{
if (drwl)
drwl->font = font;
}
static void
drwl_setimage(Drwl *drwl, Img *image)
{
if (drwl)
drwl->image = image;
}
static Fnt *
drwl_font_create(Drwl *drwl, size_t count,
const char *names[static count], const char *attributes)
{
Fnt *font = fcft_from_name(count, names, attributes);
if (drwl)
drwl_setfont(drwl, font);
return font;
}
static void
drwl_font_destroy(Fnt *font)
{
fcft_destroy(font);
}
static inline pixman_color_t
convert_color(uint32_t clr)
{
return (pixman_color_t){
((clr >> 24) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
((clr >> 16) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
((clr >> 8) & 0xFF) * 0x101 * (clr & 0xFF) / 0xFF,
(clr & 0xFF) * 0x101
};
}
static void
drwl_setscheme(Drwl *drwl, uint32_t *scm)
{
if (drwl)
drwl->scheme = scm;
}
static Img *
drwl_image_create(Drwl *drwl, unsigned int w, unsigned int h, uint32_t *bits)
{
Img *image;
pixman_region32_t clip;
image = pixman_image_create_bits_no_clear(
PIXMAN_a8r8g8b8, w, h, bits, w * 4);
if (!image)
return NULL;
pixman_region32_init_rect(&clip, 0, 0, w, h);
pixman_image_set_clip_region32(image, &clip);
pixman_region32_fini(&clip);
if (drwl)
drwl_setimage(drwl, image);
return image;
}
static void
drwl_rect(Drwl *drwl,
int x, int y, unsigned int w, unsigned int h,
int filled, int invert)
{
pixman_color_t clr;
if (!drwl || !drwl->scheme || !drwl->image)
return;
clr = convert_color(drwl->scheme[invert ? ColBg : ColFg]);
if (filled)
pixman_image_fill_rectangles(PIXMAN_OP_SRC, drwl->image, &clr, 1,
&(pixman_rectangle16_t){x, y, w, h});
else
pixman_image_fill_rectangles(PIXMAN_OP_SRC, drwl->image, &clr, 4,
(pixman_rectangle16_t[4]){
{ x, y, w, 1 },
{ x, y + h - 1, w, 1 },
{ x, y, 1, h },
{ x + w - 1, y, 1, h }});
}
static int
drwl_text(Drwl *drwl,
int x, int y, unsigned int w, unsigned int h,
unsigned int lpad, const char *text, int invert)
{
int ty;
int render = x || y || w || h;
long x_kern;
uint32_t cp = 0, last_cp = 0, state;
pixman_color_t clr;
pixman_image_t *fg_pix = NULL;
int noellipsis = 0;
const struct fcft_glyph *glyph, *eg = NULL;
int fcft_subpixel_mode = FCFT_SUBPIXEL_DEFAULT;
if (!drwl || (render && (!drwl->scheme || !w || !drwl->image)) || !text || !drwl->font)
return 0;
if (!render) {
w = invert ? invert : ~invert;
} else {
clr = convert_color(drwl->scheme[invert ? ColBg : ColFg]);
fg_pix = pixman_image_create_solid_fill(&clr);
drwl_rect(drwl, x, y, w, h, 1, !invert);
x += lpad;
w -= lpad;
}
if (render && (drwl->scheme[ColBg] & 0xFF) != 0xFF)
fcft_subpixel_mode = FCFT_SUBPIXEL_NONE;
if (render)
eg = fcft_rasterize_char_utf32(drwl->font, 0x2026 /* … */, fcft_subpixel_mode);
for (const char *p = text, *pp; pp = p, *p; p++) {
for (state = UTF8_ACCEPT; *p &&
utf8decode(&state, &cp, *p) > UTF8_REJECT; p++)
;
if (!*p || state == UTF8_REJECT) {
cp = UTF8_INVALID;
if (p > pp)
p--;
}
glyph = fcft_rasterize_char_utf32(drwl->font, cp, fcft_subpixel_mode);
if (!glyph)
continue;
x_kern = 0;
if (last_cp)
fcft_kerning(drwl->font, last_cp, cp, &x_kern, NULL);
last_cp = cp;
ty = y + (h - drwl->font->height) / 2 + drwl->font->ascent;
if (render && !noellipsis && x_kern + glyph->advance.x + eg->advance.x > w &&
*(p + 1) != '\0') {
/* cannot fit ellipsis after current codepoint */
if (drwl_text(drwl, 0, 0, 0, 0, 0, pp, 0) + x_kern <= w) {
noellipsis = 1;
} else {
w -= eg->advance.x;
pixman_image_composite32(
PIXMAN_OP_OVER, fg_pix, eg->pix, drwl->image, 0, 0, 0, 0,
x + eg->x, ty - eg->y, eg->width, eg->height);
}
}
if ((x_kern + glyph->advance.x) > w)
break;
x += x_kern;
if (render && pixman_image_get_format(glyph->pix) == PIXMAN_a8r8g8b8)
/* pre-rendered glyphs (eg. emoji) */
pixman_image_composite32(
PIXMAN_OP_OVER, glyph->pix, NULL, drwl->image, 0, 0, 0, 0,
x + glyph->x, ty - glyph->y, glyph->width, glyph->height);
else if (render)
pixman_image_composite32(
PIXMAN_OP_OVER, fg_pix, glyph->pix, drwl->image, 0, 0, 0, 0,
x + glyph->x, ty - glyph->y, glyph->width, glyph->height);
x += glyph->advance.x;
w -= glyph->advance.x;
}
if (render)
pixman_image_unref(fg_pix);
return x + (render ? w : 0);
}
static unsigned int
drwl_font_getwidth(Drwl *drwl, const char *text)
{
if (!drwl || !drwl->font || !text)
return 0;
return drwl_text(drwl, 0, 0, 0, 0, 0, text, 0);
}
static void
drwl_image_destroy(Img *image)
{
pixman_image_unref(image);
}
static void
drwl_destroy(Drwl *drwl)
{
if (drwl->font)
drwl_font_destroy(drwl->font);
if (drwl->image)
drwl_image_destroy(drwl->image);
free(drwl);
}
static void
drwl_fini(void)
{
fcft_fini();
}
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