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@@ -0,0 +1,836 @@
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+/*****************************************************************************
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+ *
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+ * Nuklear XCB/Cairo Render Backend - v0.0.2
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+ * Copyright 2021 Richard Gill
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+ *
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+ * Grabbed and adapted from https://github.com/griebd/nuklear_xcb
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+ * Copyright 2017 Adriano Grieb
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * 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, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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+ * DEALINGS IN THE SOFTWARE.
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+ *
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+ ****************************************************************************/
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+
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+/*****************************************************************************
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+ *
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+ * API
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+ *
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+ ****************************************************************************/
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+
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+#ifndef NK_XCB_CAIRO_H
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+#define NK_XCB_CAIRO_H
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+
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+struct nk_xcb_context;
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+struct nk_cairo_context;
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+
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+/* With Xcb, we work mostly on events, so to do something only when
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+ * needed it's good to know what kind of events pulled us from sleep
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+ */
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+enum nk_xcb_event_type {
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+ NK_XCB_EVENT_PAINT = 0x02,
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+ NK_XCB_EVENT_RESIZED = 0x04,
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+ NK_XCB_EVENT_STOP = 0x08
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+};
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+
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+/* Xcb part: work on windows */
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+NK_API struct nk_xcb_context *nk_xcb_init(const char *title, int pos_x, int pos_y, int width, int height);
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+NK_API void nk_xcb_free(struct nk_xcb_context *xcb_ctx);
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+
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+NK_API int nk_xcb_handle_event(struct nk_xcb_context *xcb_ctx, struct nk_context *nk_ctx);
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+NK_API void nk_xcb_render(struct nk_xcb_context *xcb_ctx);
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+NK_API void nk_xcb_size(struct nk_xcb_context *xcb_ctx, int *width, int *height);
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+
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+/* TODO: copy/paste */
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+
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+/* Cairo part: work on painting */
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+NK_API struct nk_cairo_context *nk_cairo_init(struct nk_color *bg, const char *font_file, double font_size, void *surface);
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+NK_API void nk_cairo_free(struct nk_cairo_context *cairo_ctx);
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+
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+NK_API struct nk_user_font *nk_cairo_default_font(struct nk_cairo_context *cairo_ctx);
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+NK_API void nk_cairo_damage(struct nk_cairo_context *cairo_ctx);
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+NK_API int nk_cairo_render(struct nk_cairo_context *cairo_ctx, struct nk_context *ctx);
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+
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+/* Bridge between xcb and cairo (so it's possible to use them like legos) */
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+NK_API void *nk_xcb_create_cairo_surface(struct nk_xcb_context *xcb_ctx);
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+NK_API void nk_xcb_resize_cairo_surface(struct nk_xcb_context *xcb_ctx, void *surface);
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+
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+
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+#endif /* NK_XCB_CAIRO_H */
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+
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+/*****************************************************************************
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+ *
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+ * IMPLEMENTATION
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+ *
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+ ****************************************************************************/
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+
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+#ifdef NK_XCB_CAIRO_IMPLEMENTATION
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+
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+#include <xcb/xcb.h>
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+#include <xcb/xcb_util.h>
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+#include <xcb/xcb_keysyms.h>
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+#include <X11/keysym.h>
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+#include <cairo/cairo-xcb.h>
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+#include <cairo/cairo-ft.h>
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+
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+#if defined _XOPEN_SOURCE && _XOPEN_SOURCE >= 600 || \
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+ defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 200112L
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+#include <time.h>
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+#include <errno.h>
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+#ifndef NK_XCB_FPS
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+#define NK_XCB_FPS 30
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+#endif /* NK_XCB_FPS */
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+#define NK_XCB_NSEC 1000000000
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+#define NK_XCB_MIN_FRAME_TIME (NK_XCB_NSEC / NK_XCB_FPS)
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+#endif
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+
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+#include <math.h>
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+#ifdef __USE_GNU
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+#define NK_XCB_PI M_PIl
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+#elif defined __USE_BSD || defined __USE_XOPEN
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+#define NK_XCB_PI M_PI
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+#else
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+#define NK_XCB_PI acos(-1.0)
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+#endif
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+
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+#define NK_XCB_TO_CAIRO(x) ((double) x / 255.0)
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+#define NK_XCB_DEG_TO_RAD(x) ((double) x * NK_XCB_PI / 180.0)
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+
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+struct nk_cairo_context {
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+ cairo_surface_t *surface;
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+ cairo_t *cr;
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+
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+ struct nk_user_font *font;
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+ struct nk_color *bg;
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+
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+ void *last_buffer;
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+ nk_size buffer_size;
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+ int repaint;
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+};
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+
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+struct nk_xcb_context {
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+ xcb_connection_t *conn;
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+ int screennum;
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+ xcb_window_t window;
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+ xcb_key_symbols_t *key_symbols;
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+#ifdef NK_XCB_MIN_FRAME_TIME
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+ unsigned long last_render;
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+#endif /* NK_XCB_MIN_FRAME_TIME */
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+ int events;
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+ xcb_intern_atom_reply_t* del_atom;
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+ int width, height;
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+};
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+
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+NK_API struct nk_xcb_context *nk_xcb_init(const char *title, int pos_x, int pos_y, int width, int height)
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+{
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+ int screenNum;
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+ xcb_connection_t *conn;
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+ xcb_screen_t *screen;
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+ xcb_window_t window;
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+ uint32_t values[1];
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+ struct nk_xcb_context *xcb_ctx;
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+ xcb_intern_atom_cookie_t cookie;
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+ xcb_intern_atom_reply_t *reply, *del_atom;
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+
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+ conn = xcb_connect(NULL, &screenNum);
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+ if (xcb_connection_has_error(conn)) {
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+ xcb_disconnect(conn);
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+ return NULL;
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+ }
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+ screen = xcb_aux_get_screen(conn, screenNum);
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+
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+ window = xcb_generate_id(conn);
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+ values[0] = XCB_EVENT_MASK_KEY_PRESS
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+ | XCB_EVENT_MASK_KEY_RELEASE
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+ | XCB_EVENT_MASK_BUTTON_PRESS
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+ | XCB_EVENT_MASK_BUTTON_RELEASE
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+ | XCB_EVENT_MASK_POINTER_MOTION
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+ | XCB_EVENT_MASK_BUTTON_1_MOTION
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+ | XCB_EVENT_MASK_BUTTON_2_MOTION
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+ | XCB_EVENT_MASK_BUTTON_3_MOTION
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+ | XCB_EVENT_MASK_BUTTON_4_MOTION
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+ | XCB_EVENT_MASK_BUTTON_5_MOTION
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+ | XCB_EVENT_MASK_BUTTON_MOTION
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+ | XCB_EVENT_MASK_KEYMAP_STATE
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+ | XCB_EVENT_MASK_EXPOSURE
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+ | XCB_EVENT_MASK_STRUCTURE_NOTIFY
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+ ;
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+ xcb_create_window(conn, XCB_COPY_FROM_PARENT, window, screen->root,
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+ pos_x, pos_y, width, height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
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+ XCB_COPY_FROM_PARENT, XCB_CW_EVENT_MASK, values);
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+
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+ cookie = xcb_intern_atom(conn, 1, 12, "WM_PROTOCOLS");
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+ reply = xcb_intern_atom_reply(conn, cookie, 0);
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+ cookie = xcb_intern_atom(conn, 0, 16, "WM_DELETE_WINDOW");
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+ del_atom = xcb_intern_atom_reply(conn, cookie, 0);
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+ xcb_change_property(conn, XCB_PROP_MODE_REPLACE, window, reply->atom, 4, 32, 1, &del_atom->atom);
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+ free(reply);
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+
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+ xcb_map_window(conn, window);
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+ xcb_flush(conn);
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+
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+ xcb_ctx = malloc(sizeof (struct nk_xcb_context));
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+ xcb_ctx->conn = conn;
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+ xcb_ctx->screennum = screenNum;
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+ xcb_ctx->window = window;
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+ xcb_ctx->key_symbols = xcb_key_symbols_alloc(xcb_ctx->conn);
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+ xcb_ctx->del_atom = del_atom;
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+ xcb_ctx->width = width;
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+ xcb_ctx->height = height;
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+
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+ return xcb_ctx;
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+}
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+
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+NK_API void nk_xcb_free(struct nk_xcb_context *xcb_ctx)
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+{
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+ free(xcb_ctx->del_atom);
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+ xcb_key_symbols_free(xcb_ctx->key_symbols);
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+ xcb_disconnect(xcb_ctx->conn);
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+ free(xcb_ctx);
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+}
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+
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+NK_API int nk_xcb_handle_event(struct nk_xcb_context *xcb_ctx, struct nk_context *nk_ctx)
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+{
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+ int events = 0;
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+ xcb_generic_event_t *event;
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+
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+#ifdef NK_XCB_MIN_FRAME_TIME
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+ struct timespec tp;
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+
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+ clock_gettime(CLOCK_MONOTONIC_COARSE, &tp);
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+ xcb_ctx->last_render = tp.tv_sec * NK_XCB_NSEC + tp.tv_nsec;
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+#endif /* NK_XCB_MIN_FRAME_TIME */
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+
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+ event = xcb_wait_for_event(xcb_ctx->conn);
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+
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+ nk_input_begin(nk_ctx);
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+ do {
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+ switch (XCB_EVENT_RESPONSE_TYPE(event)) {
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+ case XCB_KEY_PRESS:
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+ case XCB_KEY_RELEASE:
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+ {
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+ int press = (XCB_EVENT_RESPONSE_TYPE(event)) == XCB_KEY_PRESS;
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+ xcb_key_press_event_t *kp = (xcb_key_press_event_t *)event;
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+ xcb_keysym_t sym = xcb_key_symbols_get_keysym(xcb_ctx->key_symbols, kp->detail, kp->state);
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+ switch (sym) {
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+ case XK_Shift_L:
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+ case XK_Shift_R:
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+ nk_input_key(nk_ctx, NK_KEY_SHIFT, press);
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+ break;
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+ case XK_Control_L:
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+ case XK_Control_R:
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+ nk_input_key(nk_ctx, NK_KEY_CTRL, press);
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+ break;
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+ case XK_Delete:
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+ nk_input_key(nk_ctx, NK_KEY_DEL, press);
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+ break;
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+ case XK_Return:
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+ nk_input_key(nk_ctx, NK_KEY_ENTER, press);
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+ break;
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+ case XK_Tab:
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+ nk_input_key(nk_ctx, NK_KEY_TAB, press);
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+ break;
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+ case XK_BackSpace:
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+ nk_input_key(nk_ctx, NK_KEY_BACKSPACE, press);
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+ break;
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+ /* case NK_KEY_COPY */
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+ /* case NK_KEY_CUT */
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+ /* case NK_KEY_PASTE */
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+ case XK_Up:
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+ nk_input_key(nk_ctx, NK_KEY_UP, press);
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+ break;
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+ case XK_Down:
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+ nk_input_key(nk_ctx, NK_KEY_DOWN, press);
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+ break;
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+ case XK_Left:
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+ nk_input_key(nk_ctx, NK_KEY_LEFT, press);
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+ break;
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+ case XK_Right:
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+ nk_input_key(nk_ctx, NK_KEY_RIGHT, press);
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+ break;
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+ /* NK_KEY_TEXT_INSERT_MODE, */
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+ /* NK_KEY_TEXT_REPLACE_MODE, */
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+ case XK_Escape:
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+ nk_input_key(nk_ctx, NK_KEY_TEXT_RESET_MODE, press);
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+ break;
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+ /* NK_KEY_TEXT_LINE_START, */
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+ /* NK_KEY_TEXT_LINE_END, */
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+ case XK_Home:
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+ {
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+ nk_input_key(nk_ctx, NK_KEY_TEXT_START, press);
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+ nk_input_key(nk_ctx, NK_KEY_SCROLL_START, press);
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+ }
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+ break;
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+ case XK_End:
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+ {
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+ nk_input_key(nk_ctx, NK_KEY_TEXT_END, press);
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+ nk_input_key(nk_ctx, NK_KEY_SCROLL_END, press);
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+ }
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+ break;
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+ /* NK_KEY_TEXT_UNDO, */
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+ /* NK_KEY_TEXT_REDO, */
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+ /* NK_KEY_TEXT_SELECT_ALL, */
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+ /* NK_KEY_TEXT_WORD_LEFT, */
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+ /* NK_KEY_TEXT_WORD_RIGHT, */
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+ case XK_Page_Down:
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+ nk_input_key(nk_ctx, NK_KEY_SCROLL_DOWN, press);
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+ break;
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+ case XK_Page_Up:
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+ nk_input_key(nk_ctx, NK_KEY_SCROLL_UP, press);
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+ break;
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+ default:
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+ if (press &&
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+ !xcb_is_keypad_key(sym) &&
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+ !xcb_is_private_keypad_key(sym) &&
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+ !xcb_is_cursor_key(sym) &&
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+ !xcb_is_pf_key(sym) &&
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+ !xcb_is_function_key(sym) &&
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+ !xcb_is_misc_function_key(sym) &&
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+ !xcb_is_modifier_key(sym)
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+ ) {
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+ nk_input_char(nk_ctx, sym);
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+ }
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+ else {
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+ printf("state: %x code: %x sum: %x\n", kp->state, kp->detail, sym);
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+ }
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+ break;
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+ }
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+ }
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+ break;
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+ case XCB_BUTTON_PRESS:
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+ case XCB_BUTTON_RELEASE:
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+ {
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+ int press = (XCB_EVENT_RESPONSE_TYPE(event)) == XCB_BUTTON_PRESS;
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+ xcb_button_press_event_t *bp = (xcb_button_press_event_t *)event;
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+ switch (bp->detail) {
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+ case XCB_BUTTON_INDEX_1:
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+ nk_input_button(nk_ctx, NK_BUTTON_LEFT, bp->event_x, bp->event_y, press);
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+ break;
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+ case XCB_BUTTON_INDEX_2:
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+ nk_input_button(nk_ctx, NK_BUTTON_MIDDLE, bp->event_x, bp->event_y, press);
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+ break;
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+ case XCB_BUTTON_INDEX_3:
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+ nk_input_button(nk_ctx, NK_BUTTON_RIGHT, bp->event_x, bp->event_y, press);
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+ break;
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+ case XCB_BUTTON_INDEX_4:
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+ nk_input_scroll(nk_ctx, nk_vec2(0, 1.0f));
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+ break;
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+ case XCB_BUTTON_INDEX_5:
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+ nk_input_scroll(nk_ctx, nk_vec2(0, -1.0f));
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+ break;
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+ default: break;
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+ }
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+ }
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+ break;
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+ case XCB_MOTION_NOTIFY:
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+ {
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+ xcb_motion_notify_event_t *mn = (xcb_motion_notify_event_t *)event;
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+ nk_input_motion(nk_ctx, mn->event_x, mn->event_y);
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+ }
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+ break;
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+ case XCB_SELECTION_CLEAR:
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+ {
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+ printf("Unhandled event: %s\n", xcb_event_get_label(event->response_type));
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+ }
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+ break;
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+ case XCB_SELECTION_REQUEST:
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+ {
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+ printf("Unhandled event: %s\n", xcb_event_get_label(event->response_type));
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+ }
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+ break;
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+ case XCB_SELECTION_NOTIFY:
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+ {
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+ printf("Unhandled event: %s\n", xcb_event_get_label(event->response_type));
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+ }
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+ break;
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+ case XCB_CONFIGURE_NOTIFY:
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+ {
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+ xcb_configure_notify_event_t *cn = (xcb_configure_notify_event_t *)event;
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|
|
+ xcb_ctx->width = cn->width;
|
|
|
+ xcb_ctx->height = cn->height;
|
|
|
+ events |= NK_XCB_EVENT_RESIZED;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case XCB_KEYMAP_NOTIFY:
|
|
|
+ xcb_refresh_keyboard_mapping(xcb_ctx->key_symbols, (xcb_mapping_notify_event_t *)event);
|
|
|
+ break;
|
|
|
+ case XCB_EXPOSE:
|
|
|
+ case XCB_REPARENT_NOTIFY:
|
|
|
+ case XCB_MAP_NOTIFY:
|
|
|
+ events |= NK_XCB_EVENT_PAINT;
|
|
|
+ break;
|
|
|
+ case XCB_CLIENT_MESSAGE:
|
|
|
+ {
|
|
|
+ xcb_client_message_event_t *cm = (xcb_client_message_event_t *)event;
|
|
|
+ if (cm->data.data32[0] == xcb_ctx->del_atom->atom)
|
|
|
+ {
|
|
|
+ return NK_XCB_EVENT_STOP;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ printf ("Unhandled event: %s\n", xcb_event_get_label(event->response_type));
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ free(event);
|
|
|
+ }
|
|
|
+ while ((event = xcb_poll_for_event(xcb_ctx->conn)));
|
|
|
+ nk_input_end(nk_ctx);
|
|
|
+
|
|
|
+ return events;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void nk_xcb_render(struct nk_xcb_context *xcb_ctx)
|
|
|
+{
|
|
|
+ xcb_flush (xcb_ctx->conn);
|
|
|
+
|
|
|
+#ifdef NK_XCB_MIN_FRAME_TIME
|
|
|
+ {
|
|
|
+ struct timespec tp;
|
|
|
+ unsigned long spent;
|
|
|
+ clock_gettime(CLOCK_MONOTONIC_COARSE, &tp);
|
|
|
+ spent = tp.tv_sec * NK_XCB_NSEC + tp.tv_nsec - xcb_ctx->last_render;
|
|
|
+ if (NK_XCB_MIN_FRAME_TIME > spent) {
|
|
|
+ tp.tv_sec = 0;
|
|
|
+ tp.tv_nsec = NK_XCB_MIN_FRAME_TIME - spent;
|
|
|
+ while (clock_nanosleep(CLOCK_MONOTONIC, 0, &tp, &tp) == EINTR);
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif /* NK_XCB_MIN_FRAME_TIME */
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void nk_xcb_size(struct nk_xcb_context *xcb_ctx, int *width, int *height)
|
|
|
+{
|
|
|
+ *width = xcb_ctx->width;
|
|
|
+ *height = xcb_ctx->height;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void *nk_xcb_create_cairo_surface(struct nk_xcb_context *xcb_ctx)
|
|
|
+{
|
|
|
+ xcb_screen_t *screen;
|
|
|
+ xcb_visualtype_t *visual;
|
|
|
+
|
|
|
+ screen = xcb_aux_get_screen(xcb_ctx->conn, xcb_ctx->screennum);
|
|
|
+ visual = xcb_aux_get_visualtype(xcb_ctx->conn, xcb_ctx->screennum, screen->root_visual);
|
|
|
+ return cairo_xcb_surface_create(xcb_ctx->conn, xcb_ctx->window, visual, xcb_ctx->width, xcb_ctx->height);
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void nk_xcb_resize_cairo_surface(struct nk_xcb_context *xcb_ctx, void *surface)
|
|
|
+{
|
|
|
+ cairo_xcb_surface_set_size((cairo_surface_t *)surface, xcb_ctx->width, xcb_ctx->height);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+#define NK_TO_CAIRO(x) ((double) x / 255.0)
|
|
|
+
|
|
|
+
|
|
|
+NK_INTERN float nk_cairo_text_width(nk_handle handle, float height __attribute__ ((__unused__)), const char *text, int len)
|
|
|
+{
|
|
|
+ cairo_scaled_font_t *font = handle.ptr;
|
|
|
+ cairo_glyph_t *glyphs = NULL;
|
|
|
+ int num_glyphs;
|
|
|
+ cairo_text_extents_t extents;
|
|
|
+
|
|
|
+ cairo_scaled_font_text_to_glyphs(font, 0, 0, text, len, &glyphs, &num_glyphs, NULL, NULL, NULL);
|
|
|
+ cairo_scaled_font_glyph_extents(font, glyphs, num_glyphs, &extents);
|
|
|
+ cairo_glyph_free(glyphs);
|
|
|
+
|
|
|
+ return extents.x_advance;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API struct nk_cairo_context *nk_cairo_init(struct nk_color *bg, const char *font_file, double font_size, void *surf)
|
|
|
+{
|
|
|
+ cairo_surface_t *surface = surf;
|
|
|
+ struct nk_cairo_context *cairo_ctx;
|
|
|
+ cairo_t *cr;
|
|
|
+ cairo_font_extents_t extents;
|
|
|
+ cairo_scaled_font_t *default_font;
|
|
|
+ struct nk_user_font *font;
|
|
|
+
|
|
|
+ cr = cairo_create(surface);
|
|
|
+ font = malloc(sizeof (struct nk_user_font));
|
|
|
+ if (font_file != NULL) {
|
|
|
+ FT_Library library;
|
|
|
+ FT_Face face;
|
|
|
+ cairo_font_face_t *font_face;
|
|
|
+ static const cairo_user_data_key_t key;
|
|
|
+
|
|
|
+ FT_Init_FreeType(&library);
|
|
|
+ FT_New_Face(library, font_file, 0, &face);
|
|
|
+ font_face = cairo_ft_font_face_create_for_ft_face(face, 0);
|
|
|
+ cairo_font_face_set_user_data(font_face, &key, face, (cairo_destroy_func_t)FT_Done_Face);
|
|
|
+ cairo_set_font_face(cr, font_face);
|
|
|
+ }
|
|
|
+ if (font_size < 0.01) {
|
|
|
+ font_size = 11.0;
|
|
|
+ }
|
|
|
+ cairo_set_font_size(cr, font_size);
|
|
|
+ default_font = cairo_get_scaled_font(cr);
|
|
|
+ cairo_scaled_font_extents(default_font, &extents);
|
|
|
+ font->userdata.ptr = default_font;
|
|
|
+ font->height = extents.height;
|
|
|
+ font->width = nk_cairo_text_width;
|
|
|
+
|
|
|
+ cairo_ctx = malloc(sizeof(struct nk_cairo_context));
|
|
|
+ cairo_ctx->surface = (cairo_surface_t *)surface;
|
|
|
+ cairo_ctx->cr = cr;
|
|
|
+ cairo_ctx->font = font;
|
|
|
+ cairo_ctx->bg = bg;
|
|
|
+ cairo_ctx->last_buffer = NULL;
|
|
|
+ cairo_ctx->buffer_size = 0;
|
|
|
+ cairo_ctx->repaint = nk_false;
|
|
|
+
|
|
|
+ return cairo_ctx;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API cairo_surface_t *nk_cairo_surface(struct nk_cairo_context *cairo_ctx)
|
|
|
+{
|
|
|
+ return cairo_ctx->surface;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API struct nk_user_font *nk_cairo_default_font(struct nk_cairo_context *cairo_ctx)
|
|
|
+{
|
|
|
+ return cairo_ctx->font;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void nk_cairo_free(struct nk_cairo_context *cairo_ctx)
|
|
|
+{
|
|
|
+ free (cairo_ctx->last_buffer);
|
|
|
+ cairo_destroy(cairo_ctx->cr);
|
|
|
+ cairo_surface_destroy(cairo_ctx->surface);
|
|
|
+ free(cairo_ctx->font);
|
|
|
+ free(cairo_ctx);
|
|
|
+}
|
|
|
+
|
|
|
+NK_API void nk_cairo_damage(struct nk_cairo_context *cairo_ctx)
|
|
|
+{
|
|
|
+ cairo_ctx->repaint = nk_true;
|
|
|
+}
|
|
|
+
|
|
|
+NK_API int nk_cairo_render(struct nk_cairo_context *cairo_ctx, struct nk_context *nk_ctx)
|
|
|
+{
|
|
|
+ cairo_t *cr;
|
|
|
+ const struct nk_command *cmd = NULL;
|
|
|
+ void *cmds = nk_buffer_memory(&nk_ctx->memory);
|
|
|
+
|
|
|
+ if (cairo_ctx->buffer_size != nk_ctx->memory.allocated) {
|
|
|
+ cairo_ctx->buffer_size = nk_ctx->memory.allocated;
|
|
|
+ cairo_ctx->last_buffer = realloc(cairo_ctx->last_buffer, cairo_ctx->buffer_size);
|
|
|
+ memcpy(cairo_ctx->last_buffer, cmds, cairo_ctx->buffer_size);
|
|
|
+ }
|
|
|
+ else if (!memcmp(cmds, cairo_ctx->last_buffer, cairo_ctx->buffer_size)) {
|
|
|
+ if (!cairo_ctx->repaint) {
|
|
|
+ return nk_false;
|
|
|
+ }
|
|
|
+ cairo_ctx->repaint = nk_false;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ memcpy(cairo_ctx->last_buffer, cmds, cairo_ctx->buffer_size);
|
|
|
+ }
|
|
|
+
|
|
|
+ cr = cairo_ctx->cr;
|
|
|
+ cairo_push_group(cr);
|
|
|
+
|
|
|
+ cairo_set_source_rgb(cr, NK_TO_CAIRO(cairo_ctx->bg->r), NK_TO_CAIRO(cairo_ctx->bg->g), NK_TO_CAIRO(cairo_ctx->bg->b));
|
|
|
+ cairo_paint(cr);
|
|
|
+
|
|
|
+ nk_foreach(cmd, nk_ctx) {
|
|
|
+ switch (cmd->type) {
|
|
|
+ case NK_COMMAND_NOP:
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_SCISSOR:
|
|
|
+ {
|
|
|
+ const struct nk_command_scissor *s = (const struct nk_command_scissor *)cmd;
|
|
|
+ cairo_reset_clip(cr);
|
|
|
+ if (s->x >= 0) {
|
|
|
+ cairo_rectangle(cr, s->x - 1, s->y - 1, s->w + 2, s->h + 2);
|
|
|
+ cairo_clip(cr);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_LINE:
|
|
|
+ {
|
|
|
+ const struct nk_command_line *l = (const struct nk_command_line *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(l->color.r), NK_TO_CAIRO(l->color.g), NK_TO_CAIRO(l->color.b), NK_TO_CAIRO(l->color.a));
|
|
|
+ cairo_set_line_width(cr, l->line_thickness);
|
|
|
+ cairo_move_to(cr, l->begin.x, l->begin.y);
|
|
|
+ cairo_line_to(cr, l->end.x, l->end.y);
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_CURVE:
|
|
|
+ {
|
|
|
+ const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(q->color.r), NK_TO_CAIRO(q->color.g), NK_TO_CAIRO(q->color.b), NK_TO_CAIRO(q->color.a));
|
|
|
+ cairo_set_line_width(cr, q->line_thickness);
|
|
|
+ cairo_move_to(cr, q->begin.x, q->begin.y);
|
|
|
+ cairo_curve_to(cr, q->ctrl[0].x, q->ctrl[0].y, q->ctrl[1].x, q->ctrl[1].y, q->end.x, q->end.y);
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_RECT:
|
|
|
+ {
|
|
|
+ const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(r->color.r), NK_TO_CAIRO(r->color.g), NK_TO_CAIRO(r->color.b), NK_TO_CAIRO(r->color.a));
|
|
|
+ cairo_set_line_width(cr, r->line_thickness);
|
|
|
+ if (r->rounding == 0) {
|
|
|
+ cairo_rectangle(cr, r->x, r->y, r->w, r->h);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ int xl = r->x + r->w - r->rounding;
|
|
|
+ int xr = r->x + r->rounding;
|
|
|
+ int yl = r->y + r->h - r->rounding;
|
|
|
+ int yr = r->y + r->rounding;
|
|
|
+ cairo_new_sub_path(cr);
|
|
|
+ cairo_arc(cr, xl, yr, r->rounding, NK_XCB_DEG_TO_RAD(-90), NK_XCB_DEG_TO_RAD(0));
|
|
|
+ cairo_arc(cr, xl, yl, r->rounding, NK_XCB_DEG_TO_RAD(0), NK_XCB_DEG_TO_RAD(90));
|
|
|
+ cairo_arc(cr, xr, yl, r->rounding, NK_XCB_DEG_TO_RAD(90), NK_XCB_DEG_TO_RAD(180));
|
|
|
+ cairo_arc(cr, xr, yr, r->rounding, NK_XCB_DEG_TO_RAD(180), NK_XCB_DEG_TO_RAD(270));
|
|
|
+ cairo_close_path(cr);
|
|
|
+ }
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_RECT_FILLED:
|
|
|
+ {
|
|
|
+ const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(r->color.r), NK_TO_CAIRO(r->color.g), NK_TO_CAIRO(r->color.b), NK_TO_CAIRO(r->color.a));
|
|
|
+ if (r->rounding == 0) {
|
|
|
+ cairo_rectangle(cr, r->x, r->y, r->w, r->h);
|
|
|
+ } else {
|
|
|
+ int xl = r->x + r->w - r->rounding;
|
|
|
+ int xr = r->x + r->rounding;
|
|
|
+ int yl = r->y + r->h - r->rounding;
|
|
|
+ int yr = r->y + r->rounding;
|
|
|
+ cairo_new_sub_path(cr);
|
|
|
+ cairo_arc(cr, xl, yr, r->rounding, NK_XCB_DEG_TO_RAD(-90), NK_XCB_DEG_TO_RAD(0));
|
|
|
+ cairo_arc(cr, xl, yl, r->rounding, NK_XCB_DEG_TO_RAD(0), NK_XCB_DEG_TO_RAD(90));
|
|
|
+ cairo_arc(cr, xr, yl, r->rounding, NK_XCB_DEG_TO_RAD(90), NK_XCB_DEG_TO_RAD(180));
|
|
|
+ cairo_arc(cr, xr, yr, r->rounding, NK_XCB_DEG_TO_RAD(180), NK_XCB_DEG_TO_RAD(270));
|
|
|
+ cairo_close_path(cr);
|
|
|
+ }
|
|
|
+ cairo_fill(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_RECT_MULTI_COLOR:
|
|
|
+ {
|
|
|
+ /* from https://github.com/taiwins/twidgets/blob/master/src/nk_wl_cairo.c */
|
|
|
+ const struct nk_command_rect_multi_color *r = (const struct nk_command_rect_multi_color *)cmd;
|
|
|
+ cairo_pattern_t *pat = cairo_pattern_create_mesh();
|
|
|
+ if (pat) {
|
|
|
+ cairo_mesh_pattern_begin_patch(pat);
|
|
|
+ cairo_mesh_pattern_move_to(pat, r->x, r->y);
|
|
|
+ cairo_mesh_pattern_line_to(pat, r->x, r->y + r->h);
|
|
|
+ cairo_mesh_pattern_line_to(pat, r->x + r->w, r->y + r->h);
|
|
|
+ cairo_mesh_pattern_line_to(pat, r->x + r->w, r->y);
|
|
|
+ cairo_mesh_pattern_set_corner_color_rgba(pat, 0, NK_TO_CAIRO(r->left.r), NK_TO_CAIRO(r->left.g), NK_TO_CAIRO(r->left.b), NK_TO_CAIRO(r->left.a));
|
|
|
+ cairo_mesh_pattern_set_corner_color_rgba(pat, 1, NK_TO_CAIRO(r->bottom.r), NK_TO_CAIRO(r->bottom.g), NK_TO_CAIRO(r->bottom.b), NK_TO_CAIRO(r->bottom.a));
|
|
|
+ cairo_mesh_pattern_set_corner_color_rgba(pat, 2, NK_TO_CAIRO(r->right.r), NK_TO_CAIRO(r->right.g), NK_TO_CAIRO(r->right.b), NK_TO_CAIRO(r->right.a));
|
|
|
+ cairo_mesh_pattern_set_corner_color_rgba(pat, 3, NK_TO_CAIRO(r->top.r), NK_TO_CAIRO(r->top.g), NK_TO_CAIRO(r->top.b), NK_TO_CAIRO(r->top.a));
|
|
|
+ cairo_mesh_pattern_end_patch(pat);
|
|
|
+
|
|
|
+ cairo_rectangle(cr, r->x, r->y, r->w, r->h);
|
|
|
+ cairo_set_source(cr, pat);
|
|
|
+ cairo_fill(cr);
|
|
|
+ cairo_pattern_destroy(pat);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_CIRCLE:
|
|
|
+ {
|
|
|
+ const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(c->color.r), NK_TO_CAIRO(c->color.g), NK_TO_CAIRO(c->color.b), NK_TO_CAIRO(c->color.a));
|
|
|
+ cairo_set_line_width(cr, c->line_thickness);
|
|
|
+ cairo_save(cr);
|
|
|
+ cairo_translate(cr, c->x + c->w / 2.0, c->y + c->h / 2.0);
|
|
|
+ cairo_scale(cr, c->w / 2.0, c->h / 2.0);
|
|
|
+ cairo_arc(cr, 0, 0, 1, NK_XCB_DEG_TO_RAD(0), NK_XCB_DEG_TO_RAD(360));
|
|
|
+ cairo_restore(cr);
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_CIRCLE_FILLED:
|
|
|
+ {
|
|
|
+ const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(c->color.r), NK_TO_CAIRO(c->color.g), NK_TO_CAIRO(c->color.b), NK_TO_CAIRO(c->color.a));
|
|
|
+ cairo_save(cr);
|
|
|
+ cairo_translate(cr, c->x + c->w / 2.0, c->y + c->h / 2.0);
|
|
|
+ cairo_scale(cr, c->w / 2.0, c->h / 2.0);
|
|
|
+ cairo_arc(cr, 0, 0, 1, NK_XCB_DEG_TO_RAD(0), NK_XCB_DEG_TO_RAD(360));
|
|
|
+ cairo_restore(cr);
|
|
|
+ cairo_fill(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_ARC:
|
|
|
+ {
|
|
|
+ const struct nk_command_arc *a = (const struct nk_command_arc*) cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(a->color.r), NK_TO_CAIRO(a->color.g), NK_TO_CAIRO(a->color.b), NK_TO_CAIRO(a->color.a));
|
|
|
+ cairo_set_line_width(cr, a->line_thickness);
|
|
|
+ cairo_arc(cr, a->cx, a->cy, a->r, NK_XCB_DEG_TO_RAD(a->a[0]), NK_XCB_DEG_TO_RAD(a->a[1]));
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_ARC_FILLED:
|
|
|
+ {
|
|
|
+ const struct nk_command_arc_filled *a = (const struct nk_command_arc_filled*)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(a->color.r), NK_TO_CAIRO(a->color.g), NK_TO_CAIRO(a->color.b), NK_TO_CAIRO(a->color.a));
|
|
|
+ cairo_arc(cr, a->cx, a->cy, a->r, NK_XCB_DEG_TO_RAD(a->a[0]), NK_XCB_DEG_TO_RAD(a->a[1]));
|
|
|
+ cairo_fill(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_TRIANGLE:
|
|
|
+ {
|
|
|
+ const struct nk_command_triangle *t = (const struct nk_command_triangle *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(t->color.r), NK_TO_CAIRO(t->color.g), NK_TO_CAIRO(t->color.b), NK_TO_CAIRO(t->color.a));
|
|
|
+ cairo_set_line_width(cr, t->line_thickness);
|
|
|
+ cairo_move_to(cr, t->a.x, t->a.y);
|
|
|
+ cairo_line_to(cr, t->b.x, t->b.y);
|
|
|
+ cairo_line_to(cr, t->c.x, t->c.y);
|
|
|
+ cairo_close_path(cr);
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_TRIANGLE_FILLED:
|
|
|
+ {
|
|
|
+ const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(t->color.r), NK_TO_CAIRO(t->color.g), NK_TO_CAIRO(t->color.b), NK_TO_CAIRO(t->color.a));
|
|
|
+ cairo_move_to(cr, t->a.x, t->a.y);
|
|
|
+ cairo_line_to(cr, t->b.x, t->b.y);
|
|
|
+ cairo_line_to(cr, t->c.x, t->c.y);
|
|
|
+ cairo_close_path(cr);
|
|
|
+ cairo_fill(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_POLYGON:
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+ const struct nk_command_polygon *p = (const struct nk_command_polygon *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(p->color.r), NK_TO_CAIRO(p->color.g), NK_TO_CAIRO(p->color.b), NK_TO_CAIRO(p->color.a));
|
|
|
+ cairo_set_line_width(cr, p->line_thickness);
|
|
|
+ cairo_move_to(cr, p->points[0].x, p->points[0].y);
|
|
|
+ for (i = 1; i < p->point_count; ++i) {
|
|
|
+ cairo_line_to(cr, p->points[i].x, p->points[i].y);
|
|
|
+ }
|
|
|
+ cairo_close_path(cr);
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_POLYGON_FILLED:
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+ const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
|
|
|
+ cairo_set_source_rgba (cr, NK_TO_CAIRO(p->color.r), NK_TO_CAIRO(p->color.g), NK_TO_CAIRO(p->color.b), NK_TO_CAIRO(p->color.a));
|
|
|
+ cairo_move_to(cr, p->points[0].x, p->points[0].y);
|
|
|
+ for (i = 1; i < p->point_count; ++i) {
|
|
|
+ cairo_line_to(cr, p->points[i].x, p->points[i].y);
|
|
|
+ }
|
|
|
+ cairo_close_path(cr);
|
|
|
+ cairo_fill(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_POLYLINE:
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+ const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(p->color.r), NK_TO_CAIRO(p->color.g), NK_TO_CAIRO(p->color.b), NK_TO_CAIRO(p->color.a));
|
|
|
+ cairo_set_line_width(cr, p->line_thickness);
|
|
|
+ cairo_move_to(cr, p->points[0].x, p->points[0].y);
|
|
|
+ for (i = 1; i < p->point_count; ++i) {
|
|
|
+ cairo_line_to(cr, p->points[i].x, p->points[i].y);
|
|
|
+ }
|
|
|
+ cairo_stroke(cr);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_TEXT:
|
|
|
+ {
|
|
|
+ const struct nk_command_text *t = (const struct nk_command_text *)cmd;
|
|
|
+ cairo_glyph_t *glyphs = NULL;
|
|
|
+ int num_glyphs;
|
|
|
+ cairo_text_cluster_t *clusters = NULL;
|
|
|
+ int num_clusters;
|
|
|
+ cairo_text_cluster_flags_t cluster_flags;
|
|
|
+ cairo_font_extents_t extents;
|
|
|
+
|
|
|
+ cairo_set_source_rgba(cr, NK_TO_CAIRO(t->foreground.r), NK_TO_CAIRO(t->foreground.g), NK_TO_CAIRO(t->foreground.b), NK_TO_CAIRO(t->foreground.a));
|
|
|
+ cairo_scaled_font_extents(t->font->userdata.ptr, &extents);
|
|
|
+ cairo_scaled_font_text_to_glyphs(t->font->userdata.ptr,
|
|
|
+ t->x, t->y + extents.ascent, t->string, t->length,
|
|
|
+ &glyphs, &num_glyphs, &clusters, &num_clusters,
|
|
|
+ &cluster_flags);
|
|
|
+ cairo_show_text_glyphs(cr, t->string, t->length, glyphs,
|
|
|
+ num_glyphs, clusters, num_clusters,
|
|
|
+ cluster_flags);
|
|
|
+ cairo_glyph_free(glyphs);
|
|
|
+ cairo_text_cluster_free(clusters);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_IMAGE:
|
|
|
+ {
|
|
|
+ /* from https://github.com/taiwins/twidgets/blob/master/src/nk_wl_cairo.c */
|
|
|
+ const struct nk_command_image *im = (const struct nk_command_image *)cmd;
|
|
|
+ cairo_surface_t *img_surf;
|
|
|
+ double sw = (double)im->w / (double)im->img.region[2];
|
|
|
+ double sh = (double)im->h / (double)im->img.region[3];
|
|
|
+ cairo_format_t format = CAIRO_FORMAT_ARGB32;
|
|
|
+ int stride = cairo_format_stride_for_width(format, im->img.w);
|
|
|
+
|
|
|
+ if (!im->img.handle.ptr) return;
|
|
|
+ img_surf = cairo_image_surface_create_for_data(im->img.handle.ptr, format, im->img.w, im->img.h, stride);
|
|
|
+ if (!img_surf) return;
|
|
|
+ cairo_save(cr);
|
|
|
+
|
|
|
+ cairo_rectangle(cr, im->x, im->y, im->w, im->h);
|
|
|
+ /* scale here, if after source set, the scale would not apply to source
|
|
|
+ * surface
|
|
|
+ */
|
|
|
+ cairo_scale(cr, sw, sh);
|
|
|
+ /* the coordinates system in cairo is not intuitive, scale, translate,
|
|
|
+ * are applied to source. Refer to
|
|
|
+ * "https://www.cairographics.org/FAQ/#paint_from_a_surface" for details
|
|
|
+ *
|
|
|
+ * if you set source_origin to (0,0), it would be like source origin
|
|
|
+ * aligned to dest origin, then if you draw a rectangle on (x, y, w, h).
|
|
|
+ * it would clip out the (x, y, w, h) of the source on you dest as well.
|
|
|
+ */
|
|
|
+ cairo_set_source_surface(cr, img_surf, im->x/sw - im->img.region[0], im->y/sh - im->img.region[1]);
|
|
|
+ cairo_fill(cr);
|
|
|
+
|
|
|
+ cairo_restore(cr);
|
|
|
+ cairo_surface_destroy(img_surf);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case NK_COMMAND_CUSTOM:
|
|
|
+ {
|
|
|
+ const struct nk_command_custom *cu = (const struct nk_command_custom *)cmd;
|
|
|
+ if (cu->callback) {
|
|
|
+ cu->callback(cr, cu->x, cu->y, cu->w, cu->h, cu->callback_data);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ cairo_pop_group_to_source(cr);
|
|
|
+ cairo_paint(cr);
|
|
|
+ cairo_surface_flush(cairo_ctx->surface);
|
|
|
+
|
|
|
+ return nk_true;
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* NK_XCB_CAIRO_IMPLEMENTATION */
|
Rob Loach