diff options
Diffstat (limited to 'src/lib/libkogata/draw.c')
| -rw-r--r-- | src/lib/libkogata/draw.c | 119 |
1 files changed, 113 insertions, 6 deletions
diff --git a/src/lib/libkogata/draw.c b/src/lib/libkogata/draw.c index f11903d..662b0d5 100644 --- a/src/lib/libkogata/draw.c +++ b/src/lib/libkogata/draw.c @@ -15,6 +15,9 @@ #define STBI_NO_HDR #include "stb/stb_image.h" +#define STB_TRUETYPE_IMPLEMENTATION +#include "stb/stb_truetype.h" + // ---- fb_t *g_fb_from_file(fd_t file, fb_info_t *geom) { @@ -319,6 +322,7 @@ void g_scroll_up(fb_t *dst, int l) { // ---- Text manipulation #define FONT_ASCII_BITMAP 1 +#define FONT_STBTT 2 // more font types to come typedef struct font { @@ -329,11 +333,19 @@ typedef struct font { uint8_t cw, ch; // width, height of a character uint32_t nchars; } ascii_bitmap; + struct { + uint8_t* data; + stbtt_fontinfo info; + float scale; + } stbtt; }; int nrefs; } font_t; -font_t *g_load_ascii_bitmap_font(fd_t f) { +font_t *g_load_ascii_bitmap_font(const char* filename) { + fd_t f = sc_open(filename, FM_READ); + if (f == 0) return NULL; + font_t *font = 0; ascii_bitmap_font_header h; @@ -367,14 +379,43 @@ error: if (font && font->ascii_bitmap.data) free(font->ascii_bitmap.data); if (font) free(font); sc_close(f); - return 0; + return NULL; } -font_t *g_load_font(const char* filename) { +font_t *g_load_ttf_font(const char* filename) { fd_t f = sc_open(filename, FM_READ); - if (f != 0) return g_load_ascii_bitmap_font(f); + if (f == 0) return NULL; - return 0; + font_t *font = 0; + font = malloc(sizeof(font_t)); + if (font == 0) goto error; + + font->type = FONT_STBTT; + font->stbtt.data = NULL; + + stat_t st; + bool ok = sc_stat_open(f, &st); + if (!ok) goto error; + + font->stbtt.data = malloc(st.size); + if (font->stbtt.data == NULL) goto error; + + size_t ret = sc_read(f, 0, st.size, (void*)font->stbtt.data); + if (ret < st.size) goto error; + + if (!stbtt_InitFont(&font->stbtt.info, font->stbtt.data, 0)) { + goto error; + } + + font->nrefs = 1; + return font; + + +error: + if (font->stbtt.data) free(font->stbtt.data); + if (font) free(font); + sc_close(f); + return NULL; } void g_incref_font(font_t *f) { @@ -406,7 +447,7 @@ int g_text_height(font_t *font, const char* text) { return 0; } -void g_write(fb_t *fb, int x, int y, const char* text, font_t *font, color_t c) { +void g_write(fb_t *fb, int x, int y, const char* text, font_t *font, int size, color_t c) { if (font->type == FONT_ASCII_BITMAP) { while (*text != 0) { uint8_t id = (uint8_t)*text; @@ -425,6 +466,72 @@ void g_write(fb_t *fb, int x, int y, const char* text, font_t *font, color_t c) text++; x += font->ascii_bitmap.cw; } + } else if (font->type == FONT_STBTT) { + float scale = stbtt_ScaleForPixelHeight(&font->stbtt.info, size); + float xpos = 1; + + dbg_printf("Write TTF %s %d\n", text, size); + + uint8_t *tmp = (uint8_t*)malloc(size*size*2); + size_t tmp_size = size*size*2; + if (tmp == NULL) return; + + while (*text != 0) { + int codepoint = *text; // TODO utf8 + text++; + + int advance, lsb; + int x0, y0, x1, y1; + float x_shift = xpos - (float)floor(xpos); + stbtt_GetCodepointHMetrics(&font->stbtt.info, codepoint, &advance, &lsb); + stbtt_GetCodepointBitmapBoxSubpixel(&font->stbtt.info, codepoint, scale, scale, x_shift, 0, &x0, &y0, &x1, &y1); + + int w = x1 - x0, h = y1 - y0; + dbg_printf("%d %d %d %d\n", x0, y0, x1, y1); + + if (tmp_size < (size_t)w*h) { + free(tmp); + tmp_size = 2*w*h; + tmp = (uint8_t*)malloc(tmp_size); + if (tmp == NULL) return; + } + + stbtt_MakeCodepointBitmapSubpixel(&font->stbtt.info, tmp, w, h, w, scale, scale, x_shift, 0, codepoint); + if (fb->geom.memory_model == FB_MM_RGB32 || fb->geom.memory_model == FB_MM_RGB24) { + int sx = (fb->geom.memory_model == FB_MM_RGB32 ? 4 : 3); + + for (int i = 0; i < h; i++) { + int yy = y + y0 + i; + if (yy < 0) continue; + if (yy >= fb->geom.height) continue; + uint8_t *line = fb->data + yy * fb->geom.pitch; + + for (int j = 0; j < w; j++) { + int xx = x + x0 + (int)xpos + j; + if (xx < 0) continue; + if (xx >= fb->geom.width) continue; + + uint8_t a = tmp[i*w+j]; + uint8_t *px = line + sx * xx; + if (a == 0xFF) { + g_plot24(px, c); + } else if (a > 0) { + uint16_t r = a * (c & 0xFF) + (0x100 - a) * px[0]; + uint16_t g = a * ((c>>8) & 0xFF) + (0x100 - a) * px[1]; + uint16_t b = a * ((c>>16) & 0xFF) + (0x100 - a) * px[2]; + px[0] = r>>8; + px[1] = g>>8; + px[2] = b>>8; + } + } + } + } + xpos += scale * advance; + if (*(text+1)) + xpos += scale * stbtt_GetCodepointKernAdvance(&font->stbtt.info, *text, *(text+1)); + } + + free(tmp); } } |