mirror of
https://github.com/hajimehoshi/ebiten.git
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71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
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// Copyright 2022 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ui
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import (
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"sync/atomic"
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)
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type Context interface {
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UpdateFrame() error
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ForceUpdateFrame() error
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Layout(outsideWidth, outsideHeight float64)
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// AdjustPosition can be called from a different goroutine from Update's or Layout's.
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AdjustPosition(x, y float64, deviceScaleFactor float64) (float64, float64)
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}
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type contextImpl struct {
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context Context
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err atomic.Value
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}
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func (c *contextImpl) updateFrame() error {
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if err, ok := c.err.Load().(error); ok && err != nil {
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return err
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}
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return c.context.UpdateFrame()
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}
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func (c *contextImpl) forceUpdateFrame() error {
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if err, ok := c.err.Load().(error); ok && err != nil {
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return err
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}
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return c.context.ForceUpdateFrame()
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}
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func (c *contextImpl) layout(outsideWidth, outsideHeight float64) {
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// The given outside size can be 0 e.g. just after restoring from the fullscreen mode on Windows (#1589)
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// Just ignore such cases. Otherwise, creating a zero-sized framebuffer causes a panic.
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if outsideWidth == 0 || outsideHeight == 0 {
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return
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}
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c.context.Layout(outsideWidth, outsideHeight)
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}
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func (c *contextImpl) adjustPosition(x, y float64, deviceScaleFactor float64) (float64, float64) {
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return c.context.AdjustPosition(x, y, deviceScaleFactor)
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}
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func (c *contextImpl) setError(err error) {
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c.err.Store(err)
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}
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func SetError(err error) {
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Get().context.setError(err)
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}
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