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mediaapi/thumbnailer: Rename metrics to fitness

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Metrics is used in the context of monitoring with Prometheus so renaming
to avoid confusion.
This commit is contained in:
Robert Swain 2017-06-05 16:47:08 +02:00
parent 7af3bdf04a
commit 2cd886656f
1 changed files with 19 additions and 19 deletions
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38
src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer.go
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@ -28,7 +28,7 @@ import (
"gopkg.in/h2non/bimg.v1"
)
type thumbnailMetrics struct {
type thumbnailFitness struct {
isSmaller int
aspect float64
size float64
@ -97,15 +97,15 @@ func GetThumbnailPath(src types.Path, config types.ThumbnailSize) types.Path {
func SelectThumbnail(desired types.ThumbnailSize, thumbnails []*types.ThumbnailMetadata, thumbnailSizes []types.ThumbnailSize) (*types.ThumbnailMetadata, *types.ThumbnailSize) {
var chosenThumbnail *types.ThumbnailMetadata
var chosenThumbnailSize *types.ThumbnailSize
chosenMetrics := newThumbnailMetrics()
bestFit := newThumbnailFitness()
for _, thumbnail := range thumbnails {
if desired.ResizeMethod == "scale" && thumbnail.ThumbnailSize.ResizeMethod != "scale" {
continue
}
metrics := calcThumbnailMetrics(thumbnail.ThumbnailSize, thumbnail.MediaMetadata, desired)
if isBetter := metrics.betterThan(chosenMetrics, desired.ResizeMethod == "crop"); isBetter {
chosenMetrics = metrics
fitness := calcThumbnailFitness(thumbnail.ThumbnailSize, thumbnail.MediaMetadata, desired)
if isBetter := fitness.betterThan(bestFit, desired.ResizeMethod == "crop"); isBetter {
bestFit = fitness
chosenThumbnail = thumbnail
}
}
@ -114,9 +114,9 @@ func SelectThumbnail(desired types.ThumbnailSize, thumbnails []*types.ThumbnailM
if desired.ResizeMethod == "scale" && thumbnailSize.ResizeMethod != "scale" {
continue
}
metrics := calcThumbnailMetrics(thumbnailSize, nil, desired)
if isBetter := metrics.betterThan(chosenMetrics, desired.ResizeMethod == "crop"); isBetter {
chosenMetrics = metrics
fitness := calcThumbnailFitness(thumbnailSize, nil, desired)
if isBetter := fitness.betterThan(bestFit, desired.ResizeMethod == "crop"); isBetter {
bestFit = fitness
chosenThumbnailSize = &types.ThumbnailSize{
Width: thumbnailSize.Width,
Height: thumbnailSize.Height,
@ -307,8 +307,8 @@ func resize(dst types.Path, buffer []byte, w, h int, crop bool, logger *log.Entr
}
// init with worst values
func newThumbnailMetrics() thumbnailMetrics {
return thumbnailMetrics{
func newThumbnailFitness() thumbnailFitness {
return thumbnailFitness{
isSmaller: 1,
aspect: float64(16384 * 16384),
size: float64(16384 * 16384),
@ -317,28 +317,28 @@ func newThumbnailMetrics() thumbnailMetrics {
}
}
func calcThumbnailMetrics(size types.ThumbnailSize, metadata *types.MediaMetadata, desired types.ThumbnailSize) thumbnailMetrics {
func calcThumbnailFitness(size types.ThumbnailSize, metadata *types.MediaMetadata, desired types.ThumbnailSize) thumbnailFitness {
dW := desired.Width
dH := desired.Height
tW := size.Width
tH := size.Height
metrics := newThumbnailMetrics()
fitness := newThumbnailFitness()
// In all cases, a larger metric value is a worse fit.
// compare size: thumbnail smaller is true and gives 1, larger is false and gives 0
metrics.isSmaller = boolToInt(tW < dW || tH < dH)
fitness.isSmaller = boolToInt(tW < dW || tH < dH)
// comparison of aspect ratios only makes sense for a request for desired cropped
metrics.aspect = math.Abs(float64(dW*tH - dH*tW))
fitness.aspect = math.Abs(float64(dW*tH - dH*tW))
// compare sizes
metrics.size = math.Abs(float64((dW - tW) * (dH - tH)))
fitness.size = math.Abs(float64((dW - tW) * (dH - tH)))
// compare resize method
metrics.methodMismatch = boolToInt(size.ResizeMethod != desired.ResizeMethod)
fitness.methodMismatch = boolToInt(size.ResizeMethod != desired.ResizeMethod)
if metadata != nil {
// file size
metrics.fileSize = metadata.FileSizeBytes
fitness.fileSize = metadata.FileSizeBytes
}
return metrics
return fitness
}
func boolToInt(b bool) int {
@ -348,7 +348,7 @@ func boolToInt(b bool) int {
return 0
}
func (a thumbnailMetrics) betterThan(b thumbnailMetrics, desiredCrop bool) bool {
func (a thumbnailFitness) betterThan(b thumbnailFitness, desiredCrop bool) bool {
// preference means returning -1
// prefer images that are not smaller