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- /* See LICENSE file for copyright and license details. */
- #include <errno.h>
- #include <stdint.h>
- #include <ft2build.h>
- #include FT_FREETYPE_H
- #include <X11/Xlib.h>
- #include <X11/extensions/Xrender.h>
- #include "dtext.h"
- static dt_error load_char(dt_context *ctx, dt_font *fnt, char c);
- dt_error
- dt_init(dt_context **res, Display *dpy, Window win)
- {
- dt_error err;
- dt_context *ctx;
- Visual *visual;
- Pixmap pix;
- XRenderPictureAttributes attrs;
- if (!(ctx = malloc(sizeof(*ctx))))
- return -ENOMEM;
- if ((err = FT_Init_FreeType(&ctx->ft_lib)))
- goto fail_init_ft;
- visual = XDefaultVisual(dpy, XDefaultScreen(dpy));
- ctx->win_format = XRenderFindVisualFormat(dpy, visual);
- XFree(visual);
- ctx->argb32_format = XRenderFindStandardFormat(dpy, PictStandardARGB32);
- ctx->dpy = dpy;
- ctx->pic = XRenderCreatePicture(dpy, win, ctx->win_format, 0, &attrs);
- pix = XCreatePixmap(dpy, DefaultRootWindow(dpy), 1, 1, 32);
- attrs.repeat = 1;
- ctx->fill = XRenderCreatePicture(ctx->dpy, pix, ctx->argb32_format,
- CPRepeat, &attrs);
- XFreePixmap(dpy, pix);
- *res = ctx;
- return 0;
- fail_init_ft:
- free(ctx);
- return err;
- }
- dt_error
- dt_quit(dt_context *ctx)
- {
- dt_error err = 0;
- XRenderFreePicture(ctx->dpy, ctx->fill);
- XRenderFreePicture(ctx->dpy, ctx->pic);
- XFree(ctx->argb32_format);
- XFree(ctx->win_format);
- err = FT_Done_FreeType(ctx->ft_lib);
- free(ctx);
- return err;
- }
- dt_error
- dt_load(dt_context *ctx, dt_font **res, uint8_t size, char const *name)
- {
- dt_error err;
- dt_font *fnt;
- if (!(fnt = malloc(sizeof(*fnt))))
- return -ENOMEM;
- if ((err = FT_New_Face(ctx->ft_lib, name, 0, &fnt->face)))
- goto fail_new_face;
- if ((err = FT_Set_Char_Size(fnt->face, size << 6, 0, 0, 0)))
- goto fail_char_size;
- fnt->gs = XRenderCreateGlyphSet(ctx->dpy, ctx->argb32_format);
- memset(fnt->loaded, 0, 256);
- *res = fnt;
- return 0;
- fail_char_size:
- FT_Done_Face(fnt->face); // if this fails... just ignore
- fail_new_face:
- free(fnt);
- return err;
- }
- dt_error
- dt_free(dt_context *ctx, dt_font *fnt)
- {
- dt_error err = 0;
- XRenderFreeGlyphSet(ctx->dpy, fnt->gs);
- err = FT_Done_Face(fnt->face);
- free(fnt);
- return err;
- }
- dt_error
- dt_draw(dt_context *ctx, dt_font *fnt, dt_style const *style,
- uint32_t x, uint32_t y, char const *txt)
- {
- dt_error err;
- XRenderColor col;
- size_t len;
- size_t i;
- col.red = (style->red << 8) + style->red;
- col.green = (style->green << 8) + style->green;
- col.blue = (style->blue << 8) + style->blue;
- col.alpha = 0xFFFF - ((style->alpha << 8) + style->alpha);
- XRenderFillRectangle(ctx->dpy, PictOpSrc, ctx->fill, &col, 0, 0, 1, 1);
- len = strlen(txt);
- for (i = 0; i < len; ++i)
- if ((err = load_char(ctx, fnt, txt[i])))
- return err;
- XRenderCompositeString8(ctx->dpy, PictOpOver, ctx->fill, ctx->pic,
- ctx->argb32_format, fnt->gs, 0, 0, x, y,
- txt, len);
- return 0;
- }
- static dt_error
- load_char(dt_context *ctx, dt_font *fnt, char c)
- {
- dt_error err;
- FT_GlyphSlot slot;
- Glyph gid;
- XGlyphInfo g;
- char *img;
- size_t x, y, i;
- if (fnt->loaded[(uint8_t) c])
- return 0;
- if ((err = FT_Load_Char(fnt->face, c, FT_LOAD_RENDER)))
- return err;
- slot = fnt->face->glyph;
- gid = c;
- g.width = slot->bitmap.width;
- g.height = slot->bitmap.rows;
- g.x = - slot->bitmap_left;
- g.y = slot->bitmap_top;
- g.xOff = slot->advance.x >> 6;
- g.yOff = slot->advance.y >> 6;
- if (!(img = malloc(4 * g.width * g.height)))
- return -ENOMEM;
- for (y = 0; y < g.height; ++y)
- for (x = 0; x < g.width; ++x)
- for (i = 0; i < 4; ++i)
- img[4 * (y * g.width + x) + i] =
- slot->bitmap.buffer[y * g.width + x];
- XRenderAddGlyphs(ctx->dpy, fnt->gs, &gid, &g, 1,
- img, 4 * g.width * g.height);
- free(img);
- fnt->loaded[(uint8_t) c] = 1;
- return 0;
- }
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