doodle/pkg/level/screenshot.go

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package level
import (
"bytes"
"image"
"image/png"
"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
"git.kirsle.net/go/ui"
)
// Helper functions to get a level's embedded screenshot PNGs as textures.
// HasScreenshot returns whether screenshots exist for the level.
func (lvl *Level) HasScreenshot() bool {
var filenames = []string{
balance.LevelScreenshotLargeFilename,
balance.LevelScreenshotMediumFilename,
balance.LevelScreenshotSmallFilename,
}
for _, filename := range filenames {
if lvl.Files.Exists("assets/screenshots/" + filename) {
return true
}
}
return false
}
// GetScreenshotImage returns a screenshot from the level's data as a Go Image.
// The filename is like "large.png" or "medium.png" and is appended to "assets/screenshots"
func (lvl *Level) GetScreenshotImage(filename string) (image.Image, error) {
data, err := lvl.Files.Get("assets/screenshots/" + filename)
if err != nil {
return nil, err
}
return png.Decode(bytes.NewBuffer(data))
}
// GetScreenshotImageAsUIImage returns a ui.Image texture of a screenshot.
func (lvl *Level) GetScreenshotImageAsUIImage(filename string) (*ui.Image, error) {
// Have it cached recently?
if lvl.cacheImages == nil {
lvl.cacheImages = map[string]*ui.Image{}
} else if img, ok := lvl.cacheImages[filename]; ok {
return img, nil
}
img, err := lvl.GetScreenshotImage(filename)
if err != nil {
return nil, err
}
result, err := ui.ImageFromImage(img)
if err != nil {
return nil, err
}
lvl.cacheImages[filename] = result
return result, nil
}