mirror of
https://github.com/elementary/gala.git
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164 lines
4.7 KiB
Vala
164 lines
4.7 KiB
Vala
/*
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* Copyright 2024 elementary, Inc. (https://elementary.io)
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* SPDX-License-Identifier: LGPL-2.0-or-later
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*/
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#if HAS_MUTTER46
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public class Gala.Drawing.Canvas : GLib.Object, Clutter.Content {
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private int width = -1;
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private int height = -1;
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private float scale_factor = 1.0f;
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private Cogl.Texture? texture = null;
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private Cogl.Bitmap? bitmap = null;
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private bool dirty = false;
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public signal void draw (Cairo.Context cr, int width, int height);
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private void emit_draw () requires (width > 0 && height > 0) {
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dirty = true;
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int real_width = (int) Math.ceilf (width * scale_factor);
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int real_height = (int) Math.ceilf (height * scale_factor);
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if (bitmap == null) {
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unowned Cogl.Context ctx = Clutter.get_default_backend ().get_cogl_context ();
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bitmap = new Cogl.Bitmap.with_size (ctx, real_width, real_height, Cogl.PixelFormat.CAIRO_ARGB32_COMPAT);
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}
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unowned Cogl.Buffer? buffer = bitmap.get_buffer ();
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if (buffer == null) {
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return;
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}
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buffer.set_update_hint (Cogl.BufferUpdateHint.DYNAMIC);
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void* data = buffer.map (Cogl.BufferAccess.READ_WRITE, Cogl.BufferMapHint.DISCARD);
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Cairo.ImageSurface surface;
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bool mapped_buffer;
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if (data != null) {
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var bitmap_stride = bitmap.get_rowstride ();
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surface = new Cairo.ImageSurface.for_data ((uchar[]) data, Cairo.Format.ARGB32, real_width, real_height, bitmap_stride);
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mapped_buffer = true;
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} else {
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surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, real_width, real_height);
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mapped_buffer = false;
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}
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surface.set_device_scale (scale_factor, scale_factor);
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var cr = new Cairo.Context (surface);
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draw ((owned) cr, width, height);
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if (mapped_buffer) {
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buffer.unmap ();
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} else {
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int size = surface.get_stride () * height;
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buffer.set_data (0, surface.get_data (), size);
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}
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}
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public bool get_preferred_size (out float out_width, out float out_height) {
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if (width < 0 || width < 0) {
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out_width = 0;
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out_height = 0;
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return false;
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}
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out_width = Math.ceilf (width * scale_factor);
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out_height = Math.ceilf (height * scale_factor);
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return true;
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}
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public void invalidate () {
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if (width <= 0 || height <= 0) {
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return;
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}
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emit_draw ();
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}
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public void invalidate_size () { }
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public void paint_content (Clutter.Actor actor, Clutter.PaintNode root, Clutter.PaintContext paint_context) {
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if (bitmap == null) {
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return;
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}
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if (dirty) {
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texture = null;
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}
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if (texture == null) {
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texture = new Cogl.Texture2D.from_bitmap (bitmap);
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}
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if (texture == null) {
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return;
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}
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var node = actor.create_texture_paint_node (texture);
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root.add_child (node);
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dirty = false;
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}
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public void set_size (int new_width, int new_height) requires (new_width >= -1 && new_height >= -1) {
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if (new_width == width && new_height == height) {
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return;
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}
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width = new_width;
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height = new_height;
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invalidate ();
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}
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public void set_scale_factor (float new_scale_factor) requires (new_scale_factor > 0.0f) {
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if (new_scale_factor != scale_factor) {
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scale_factor = new_scale_factor;
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invalidate ();
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}
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}
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}
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#else
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public class Gala.Drawing.Canvas : GLib.Object, Clutter.Content {
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public Clutter.Canvas canvas;
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construct {
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canvas = new Clutter.Canvas ();
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canvas.draw.connect (on_draw);
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}
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public signal void draw (Cairo.Context cr, int width, int height);
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public bool get_preferred_size (out float out_width, out float out_height) {
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return canvas.get_preferred_size (out out_width, out out_height);
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}
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public void invalidate () {
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canvas.invalidate ();
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}
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public void invalidate_size () {
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canvas.invalidate_size ();
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}
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public void paint_content (Clutter.Actor actor, Clutter.PaintNode root, Clutter.PaintContext paint_context) {
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canvas.paint_content (actor, root, paint_context);
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}
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public void set_size (int new_width, int new_height) requires (new_width >= -1 && new_height >= -1) {
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canvas.set_size (new_width, new_height);
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}
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public void set_scale_factor (float new_scale_factor) requires (new_scale_factor > 0.0f) {
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canvas.set_scale_factor (new_scale_factor);
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}
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private bool on_draw (Cairo.Context cr, int width, int height) {
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draw (cr, width, height);
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return true;
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}
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}
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#endif
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