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306
drwl.h
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306
drwl.h
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/*
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* drwl - https://codeberg.org/sewn/drwl
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* See LICENSE file for copyright and license 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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#define BETWEEN(X, A, B) ((A) <= (X) && (X) <= (B))
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enum { ColFg, ColBg }; /* colorscheme index */
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typedef struct {
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pixman_image_t *pix;
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struct fcft_font *font;
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uint32_t *scheme;
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} Drwl;
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#define UTF_INVALID 0xFFFD
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#define UTF_SIZ 4
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static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
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static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
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static const uint32_t utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
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static const uint32_t utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
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static inline uint32_t
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utf8decodebyte(const char c, size_t *i)
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{
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for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
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if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
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return (unsigned char)c & ~utfmask[*i];
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return 0;
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}
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static inline size_t
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utf8decode(const char *c, uint32_t *u)
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{
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size_t i, j, len, type;
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uint32_t udecoded;
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*u = UTF_INVALID;
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udecoded = utf8decodebyte(c[0], &len);
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if (!BETWEEN(len, 1, UTF_SIZ))
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return 1;
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for (i = 1, j = 1; i < UTF_SIZ && j < len; ++i, ++j) {
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udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
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if (type)
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return j;
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}
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if (j < len)
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return 0;
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*u = udecoded;
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if (!BETWEEN(*u, utfmin[len], utfmax[len]) || BETWEEN(*u, 0xD800, 0xDFFF))
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*u = UTF_INVALID;
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for (i = 1; *u > utfmax[i]; ++i)
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;
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return len;
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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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/*
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* Caller must call drwl_init before drwl_create, and
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* drwl_destroy on returned context after finalizing usage.
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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, struct fcft_font *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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/*
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* Returned font is set within the drawing context if given.
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* Caller must call drwl_destroy_font on returned font when done using it,
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* otherwise use drwl_destroy when instead given a drwl context.
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*/
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static struct fcft_font *
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drwl_load_font(Drwl *drwl, size_t fontcount,
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const char *fonts[static fontcount], const char *attributes)
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{
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struct fcft_font *font = fcft_from_name(fontcount, fonts, 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_destroy_font(struct fcft_font *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,
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((clr >> 16) & 0xFF) * 0x101,
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((clr >> 8) & 0xFF) * 0x101,
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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 inline int
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drwl_stride(unsigned int width)
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{
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return (((PIXMAN_FORMAT_BPP(PIXMAN_a8r8g8b8) * width + 7) / 8 + 4 - 1) & -4);
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}
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/*
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* Caller must call drwl_finish_drawing when finished drawing.
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* Parameter stride can be calculated using drwl_stride.
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*/
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static void
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drwl_prepare_drawing(Drwl *drwl, unsigned int w, unsigned int h,
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uint32_t *bits, int stride)
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{
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pixman_region32_t clip;
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if (!drwl)
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return;
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drwl->pix = pixman_image_create_bits_no_clear(
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PIXMAN_a8r8g8b8, w, h, bits, stride);
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pixman_region32_init_rect(&clip, 0, 0, w, h);
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pixman_image_set_clip_region32(drwl->pix, &clip);
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pixman_region32_fini(&clip);
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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->pix)
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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->pix, &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->pix, &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 utf8charlen, render = x || y || w || h;
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long x_kern;
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uint32_t cp = 0, last_cp = 0;
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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;
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int fcft_subpixel_mode = FCFT_SUBPIXEL_DEFAULT;
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if (!drwl || (render && (!drwl->scheme || !w || !drwl->pix)) || !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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// U+2026 == …
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eg = fcft_rasterize_char_utf32(drwl->font, 0x2026, fcft_subpixel_mode);
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while (*text) {
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utf8charlen = utf8decode(text, &cp);
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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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/* draw ellipsis if remaining text doesn't fit */
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if (!noellipsis && x_kern + glyph->advance.x + eg->advance.x > w && *(text + 1) != '\0') {
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if (drwl_text(drwl, 0, 0, 0, 0, 0, text, 0)
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- glyph->advance.x < eg->advance.x) {
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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->pix, 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->pix, 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->pix, 0, 0, 0, 0,
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x + glyph->x, ty - glyph->y, glyph->width, glyph->height);
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text += utf8charlen;
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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 unsigned int
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drwl_font_getwidth_clamp(Drwl *drwl, const char *text, unsigned int n)
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{
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unsigned int tmp = 0;
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if (drwl && drwl->font && text && n)
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tmp = drwl_text(drwl, 0, 0, 0, 0, 0, text, n);
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return tmp < n ? tmp : n;
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}
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static void
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drwl_finish_drawing(Drwl *drwl)
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{
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if (drwl && drwl->pix)
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pixman_image_unref(drwl->pix);
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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->pix)
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pixman_image_unref(drwl->pix);
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if (drwl->font)
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drwl_destroy_font(drwl->font);
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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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