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Cairo backport enhancements #21

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Cairo backport enhancements #21

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208a80f
Implement missing canvas functions
eakoli Dec 13, 2023
24a8ae6
basic implementation of font based on elements Cairo implementation
eakoli Dec 13, 2023
b79bcdf
Implement offscreen_image and image fixes
eakoli Dec 13, 2023
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34 changes: 33 additions & 1 deletion lib/impl/cairo/canvas.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
#include <cairo.h>
#include <stack>

#include "font_impl.h"

namespace cycfi::artist
{
class canvas::canvas_state
Expand All @@ -25,6 +27,7 @@ namespace cycfi::artist

void apply_fill_style();
void apply_stroke_style();
float pre_scale = 1.0f;

using state_stack = std::stack<info>;

Expand Down Expand Up @@ -60,8 +63,10 @@ namespace cycfi::artist
{
}

void canvas::pre_scale(float scale)
void canvas::pre_scale(float sc)
{
scale({sc,sc});
_state->pre_scale = sc;
}

void canvas::translate(point p)
Expand All @@ -79,6 +84,20 @@ namespace cycfi::artist
cairo_scale(_context, p.x, p.y);
}

point canvas::device_to_user(point p) {
double x = p.x * _state->pre_scale;
double y = p.y * _state->pre_scale;
cairo_device_to_user_distance(_context, &x, &y);
return {float(x),float(y)};
}

point canvas::user_to_device(point p) {
double x = p.x;
double y = p.y;
cairo_user_to_device_distance(_context, &x, &y);
return {float(x / _state->pre_scale),float(y / _state->pre_scale)};
}

void canvas::save()
{
cairo_save(_context);
Expand All @@ -102,6 +121,10 @@ namespace cycfi::artist
cairo_close_path(_context);
}

void canvas::fill_rule(path::fill_rule_enum rule) {
//TODO
}

void canvas::fill()
{
_state->apply_fill_style();
Expand Down Expand Up @@ -131,6 +154,11 @@ namespace cycfi::artist
cairo_clip(_context);
}

bool canvas::point_in_path(point p) const {
// not sure how to implement this on cairo
return false;
}

void canvas::move_to(point p)
{
cairo_move_to(_context, p.x, p.y);
Expand Down Expand Up @@ -399,6 +427,10 @@ namespace cycfi::artist

void canvas::font(class font const& font_)
{
if( font_.impl() ) {
cairo_set_font_face(_context,font_.impl()->font_face);
cairo_set_font_size(_context,font_.impl()->size);
}
}

namespace
Expand Down
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