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