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svgwidget: greatly improve performance by caching render result

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hippoz 2022-07-27 03:19:20 +03:00
parent bbec75f451
commit 2b1706a41a
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GPG key ID: 7C52899193467641
2 changed files with 38 additions and 6 deletions
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35
src/SvgWidget.cpp
View file

@ -1,4 +1,7 @@
#include "SvgWidget.hpp"
#include "cairomm/context.h"
#include "cairomm/enums.h"
#include "cairomm/surface.h"
void SvgWidget::on_init() {
m_file = g_file_new_for_path(m_path.c_str());
@ -6,8 +9,7 @@ void SvgWidget::on_init() {
set_style(&Raven::clear_widget_style);
if (!m_handle)
{
if (!m_handle) {
std::cerr << "could not load svg file: " << m_path << std::endl;
exit(EXIT_FAILURE);
}
@ -15,15 +17,36 @@ void SvgWidget::on_init() {
set_did_init(true);
}
void SvgWidget::on_paint() {
void SvgWidget::on_after_layout() {
auto width = rect().width();
auto height = rect().height();
if (width == m_known_width && height == m_known_height) {
return;
}
m_known_width = width;
m_known_height = height;
RsvgRectangle viewport = {
.x = 0.0,
.y = 0.0,
.width = rect().width(),
.height = rect().height(),
.width = width,
.height = height,
};
rsvg_handle_render_document(m_handle, painter()->cairo()->cobj(), &viewport, NULL);
m_image_surface = Cairo::ImageSurface::create(Cairo::Format::FORMAT_ARGB32, width, height);
m_image_context = Cairo::Context::create(m_image_surface);
rsvg_handle_render_document(m_handle, m_image_context->cobj(), &viewport, NULL);
}
void SvgWidget::on_paint() {
if (!m_image_surface)
return;
painter()->cairo()->set_source(m_image_surface, 0, 0);
painter()->cairo()->paint();
}
SvgWidget::~SvgWidget() {

9
src/SvgWidget.hpp
View file

@ -1,6 +1,10 @@
#pragma once
#include <string>
#include "cairomm/context.h"
#include "cairomm/enums.h"
#include "cairomm/refptr.h"
#include "cairomm/surface.h"
#include "raven/Widget.hpp"
#include "librsvg/rsvg.h"
@ -17,9 +21,14 @@ public:
void set_path(std::string path) { m_path = path; repaint(); }
protected:
void on_init();
void on_after_layout();
void on_paint();
private:
std::string m_path;
RsvgHandle *m_handle;
GFile *m_file;
Cairo::RefPtr<Cairo::Context> m_image_context;
Cairo::RefPtr<Cairo::ImageSurface> m_image_surface;
double m_known_width { 0.0 };
double m_known_height { 0.0 };
};