tip/ui/gtk/draw_gdk.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "container.h"

#include "draw_gdk.h"


gboolean ui_drawingarea_expose(GtkWidget *w, GdkEventExpose *e, void *data) {
    UiGdkGraphics g;
    g.g.width = w->allocation.width;
    g.g.height = w->allocation.height;
    g.widget = w;
    g.gc = gdk_gc_new(w->window);
    
    UiDrawEvent *event = data;
    UiEvent ev;
    ev.obj = event->obj;
    ev.window = event->obj->window;
    ev.document = event->obj->ctx->document;
    
    event->callback(&ev, &g.g, event->userdata);
    
    return FALSE;
}

// function from graphics.h

void ui_connect_draw_handler(GtkWidget *widget, UiDrawEvent *event) {
    g_signal_connect(G_OBJECT(widget),
            "expose_event",
            G_CALLBACK(ui_drawingarea_expose),
            event);
}

PangoContext *ui_get_pango_context(UiGraphics *g) {
    UiGdkGraphics *gr = (UiGdkGraphics*)g;
    return gtk_widget_get_pango_context(gr->widget);
}

// drawing functions
void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
    UiGdkGraphics *gr = (UiGdkGraphics*)g;
    GdkColor color;
    color.red = red * 257;
    color.green = green * 257;
    color.blue = blue * 257;
    gdk_gc_set_rgb_fg_color(gr->gc, &color);
    //gdk_gc_set_rgb_bg_color(g->gc, &color);
}

void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
    gdk_draw_line(gr->widget->window, gr->gc, x1, y1, x2, y2);
}

void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
    gdk_draw_rectangle(gr->widget->window, gr->gc, fill, x, y, w, h);
}

void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
    gdk_draw_layout(gr->widget->window, gr->gc, x, y, text->layout);
}