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Initial commit.

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This commit adds some basic components.
Currently, there is an issue with the drawing order of the text.
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hippoz 2022-01-22 17:51:54 +02:00
commit 1b53572480
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meson.build Normal file
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project('blit', 'cpp')
cairomm_dep = dependency('cairomm-1.0')
pangocairo_dep = dependency('pangocairo')
xlib_dep = dependency('x11')
executable('blit_app', './src/main.cpp', dependencies : [cairomm_dep, xlib_dep, pangocairo_dep])

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src/main.cpp Normal file
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#include <string>
#include <vector>
#include <iostream>
#include <cairomm-1.0/cairomm/xlib_surface.h>
#include <cairomm-1.0/cairomm/context.h>
#include <cairomm-1.0/cairomm/surface.h>
#include <pango/pangocairo.h>
void panic(int exit_code, const char *message) {
fputs(message, stderr);
exit(exit_code);
}
namespace Blit {
bool collide_point_rect(double x, double y, double w, double h, double x1, double y1) {
return x1 >= x && x + w >= x1 &&
y1 >= y && y + h >= y1;
}
enum TextAlign {
TEXT_ALIGN_NONE,
TEXT_ALIGN_CENTER_LEFT,
TEXT_ALIGN_CENTER
};
class RGB {
public:
double r, g, b;
public:
RGB(double r, double g, double b) : r(r), g(g), b(b) {
}
};
class BaseElement {
public:
BaseElement() {}
virtual ~BaseElement() {}
bool should_get_x_events = true;
virtual void draw() = 0;
virtual void handle_event(XEvent *e) = 0;
};
class Window {
public:
Cairo::RefPtr<Cairo::Context> cr;
Display *dsp;
private:
std::vector<Blit::BaseElement *> m_attached_elements;
public:
Window(int x, int y)
{
Drawable da;
int screen;
if ((dsp = XOpenDisplay(NULL)) == NULL)
panic(1, "Failed to open display");
screen = DefaultScreen(dsp);
da = XCreateSimpleWindow(dsp, DefaultRootWindow(dsp), 0, 0, x, y, 0, 0, 0);
XSelectInput(dsp, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask | PointerMotionMask);
XMapWindow(dsp, da);
auto x_surface = Cairo::XlibSurface::create(
dsp,
da,
DefaultVisual(dsp, screen),
x,
y
);
cr = Cairo::Context::create(x_surface);
}
void attach_element_init(Blit::BaseElement *element) {
m_attached_elements.push_back(element);
}
void attach_element(Blit::BaseElement *element) {
m_attached_elements.push_back(element);
element->draw();
}
void redraw_all() {
for (Blit::BaseElement * element : m_attached_elements) {
element->draw();
}
}
void handle_x_event(XEvent *e) {
for (Blit::BaseElement * element : m_attached_elements) {
if (element->should_get_x_events)
element->handle_event(e);
}
}
};
class Text : public BaseElement {
public:
PangoFontDescription *font_description;
bool should_get_x_events = false;
Blit::TextAlign text_align = Blit::TextAlign::TEXT_ALIGN_NONE;
double x, y, box_x, box_y, box_w, box_h = 0;
std::string text;
Blit::RGB fg;
Cairo::RefPtr<Cairo::Context> cr;
public:
Text(Cairo::RefPtr<Cairo::Context> cr, std::string& text, PangoFontDescription *font_description) :
cr(cr),
text(text),
font_description(font_description),
fg(0.0, 0.0, 0.0)
{}
virtual ~Text() {}
void draw() {
cr->save();
cr->set_source_rgb(fg.r, fg.g, fg.b);
if (text_align == Blit::TextAlign::TEXT_ALIGN_NONE) {
PangoLayout *layout = pango_cairo_create_layout(cr->cobj());
pango_layout_set_font_description(layout, font_description);
pango_layout_set_text(layout, text.c_str(), -1);
cr->move_to(x, y);
pango_cairo_show_layout(cr->cobj(), layout);
g_object_unref(layout);
} else if (text_align == Blit::TextAlign::TEXT_ALIGN_CENTER_LEFT) {
PangoLayout *layout = pango_cairo_create_layout(cr->cobj());
int font_width;
int font_height;
pango_layout_set_font_description(layout, font_description);
pango_layout_set_text(layout, text.c_str(), -1);
pango_layout_get_pixel_size(layout, &font_width, &font_height);
double x = box_x + ((box_w - font_width) / 2);
double y = box_y + ((box_h - font_height) / 2);
// TODO: unhardcode the padding
x = box_x + 4;
cr->move_to(x, y);
pango_cairo_show_layout(cr->cobj(), layout);
g_object_unref(layout);
} else if (text_align == Blit::TextAlign::TEXT_ALIGN_CENTER) {
PangoLayout *layout = pango_cairo_create_layout(cr->cobj());
int font_width;
int font_height;
pango_layout_set_font_description(layout, font_description);
pango_layout_set_text(layout, text.c_str(), -1);
pango_layout_get_pixel_size(layout, &font_width, &font_height);
double x = box_x + ((box_w - font_width) / 2);
double y = box_y + ((box_h - font_height) / 2);
cr->move_to(x, y);
pango_cairo_show_layout(cr->cobj(), layout);
g_object_unref(layout);
}
cr->fill();
cr->restore();
}
void handle_event(XEvent *e) {}
void set_x(double val) {
x = val;
draw();
}
void set_y(double val) {
y = val;
draw();
}
void set_box_x(double val) {
box_x = val;
draw();
}
void set_box_y(double val) {
box_y = val;
draw();
}
void set_box_w(double val) {
box_w = val;
draw();
}
void set_box_h(double val) {
box_h = val;
draw();
}
void set_text(std::string& text) {
text = text;
draw();
}
void set_text_align(Blit::TextAlign val) {
text_align = val;
draw();
}
void set_current_fg(Blit::RGB val) {
fg = val;
draw();
}
};
class Button : public BaseElement {
public:
bool should_get_x_events = true;
double x, y, w, h, border_radius = 0;
Blit::RGB current_bg, bg, sel_bg;
bool is_hot, is_active = false;
Cairo::RefPtr<Cairo::Context> cr;
public:
Button(Cairo::RefPtr<Cairo::Context> cr) :
should_get_x_events(true),
current_bg(0.0, 0.0, 0.0),
sel_bg(0.0, 0.0, 0.0),
bg(0.0, 0.0, 0.0),
cr(cr)
{}
virtual ~Button() {}
void draw() {
cr->save();
cr->set_source_rgb(current_bg.r, current_bg.g, current_bg.b);
if (border_radius > 0) {
double aspect = 1.0;
double radius = border_radius / aspect;
double degrees = M_PI / 180.0;
cr->begin_new_sub_path();
cr->arc(x + w - radius, y + radius, radius, -90 * degrees, 0 * degrees);
cr->arc(x + w - radius, y + h - radius, radius, 0 * degrees, 90 * degrees);
cr->arc(x + radius, y + h - radius, radius, 90 * degrees, 180 * degrees);
cr->arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
cr->close_path();
} else {
cr->rectangle(x, y, w, h);
}
cr->fill();
cr->restore();
}
void handle_event(XEvent *e) {
char keybuf[8];
KeySym key;
switch (e->type) {
case MotionNotify:
bool is_hot_now = Blit::collide_point_rect(x, y, w, h, e->xmotion.x, e->xmotion.y);
if (!is_hot && is_hot_now) { // just became hot
set_current_bg(sel_bg);
is_hot = true;
} else if (is_hot && !is_hot_now) { // just became not hot
set_current_bg(bg);
is_hot = false;
}
break;
}
}
void set_x(double val) {
x = val;
draw();
}
void set_y(double val) {
y = val;
draw();
}
void set_w(double val) {
w = val;
draw();
}
void set_h(double val) {
h = val;
draw();
}
void set_border_radius(double val) {
border_radius = val;
draw();
}
void set_current_bg(Blit::RGB val) {
current_bg = val;
draw();
}
};
}
int main() {
std::string text = "click me now";
XEvent e;
PangoFontDescription *font_description = pango_font_description_new();
pango_font_description_set_family(font_description, "sans-serif");
pango_font_description_set_weight(font_description, PANGO_WEIGHT_NORMAL);
pango_font_description_set_absolute_size(font_description, 16 * PANGO_SCALE);
Blit::Window window(800, 600);
Blit::Button button(window.cr);
Blit::Text button_text(window.cr, text, font_description);
button.x = 20.0;
button.y = 20.0;
button.w = 100.0;
button.h = 30.0;
button.border_radius = 0.0;
button.bg = Blit::RGB(1.0, 0.0, 0.0);
button.sel_bg = Blit::RGB(0.0, 1.0, 0.0);
button_text.x = button.x;
button_text.y = button.y;
button_text.box_x = button.x;
button_text.box_y = button.y;
button_text.box_w = button.w;
button_text.box_h = button.h;
button_text.fg = Blit::RGB(1.0, 1.0, 1.0);
button_text.text_align = Blit::TextAlign::TEXT_ALIGN_CENTER;
window.attach_element(&button);
window.attach_element(&button_text);
for (;;) {
XNextEvent(window.dsp, &e);
window.handle_x_event(&e);
}
return 0;
}