72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package images
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const (
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UNKNOWN ImageType = 1 + iota
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// Raster image types
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JPEG
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PNG
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GIF
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WEBP
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)
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const (
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MaxJpegQuality = 80
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MinJpegQuality = 50
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SmallDim = ResizeDimension(80)
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LargeDim = ResizeDimension(240)
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BannerDim = ResizeDimension(800)
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SmallDimName = "thumbnail"
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LargeDimName = "large"
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BannerIdentityName = "banner"
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)
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var (
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// ResizeDimensions list of all available image resize sizes
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ResizeDimensions = []ResizeDimension{SmallDim, LargeDim}
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// DimensionSizeLimit the size limits imposed on each resize dimension
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// Figures are based on the following sample data https://github.com/status-im/status-mobile/issues/11047#issuecomment-694970473
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DimensionSizeLimit = map[ResizeDimension]FileSizeLimits{
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SmallDim: {
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Ideal: 2560, // Base on the largest sample image at quality 60% (2,554 bytes ∴ 1024 * 2.5)
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Max: 5632, // Base on the largest sample image at quality 80% + 50% margin (3,683 bytes * 1.5 ≈ 5500 ∴ 1024 * 5.5)
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},
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LargeDim: {
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Ideal: 16384, // Base on the largest sample image at quality 60% (16,143 bytes ∴ 1024 * 16)
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Max: 38400, // Base on the largest sample image at quality 80% + 50% margin (24,290 bytes * 1.5 ≈ 37500 ∴ 1024 * 37.5)
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},
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}
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// ResizeDimensionToName maps a ResizeDimension to its assigned string name
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ResizeDimensionToName = map[ResizeDimension]string{
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SmallDim: SmallDimName,
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LargeDim: LargeDimName,
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}
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// NameToResizeDimension maps a string name to its assigned ResizeDimension
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NameToResizeDimension = map[string]ResizeDimension{
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SmallDimName: SmallDim,
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LargeDimName: LargeDim,
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}
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)
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type FileSizeLimits struct {
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Ideal int
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Max int
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}
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type ImageType uint
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type ResizeDimension uint
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func GetBannerDimensionLimits() FileSizeLimits {
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return FileSizeLimits{
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Ideal: 307200, // We want to save space and traffic but keep to maximum compression
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Max: 460800, // Can't go bigger than 450 KB
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}
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}
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