58 lines
2.3 KiB
Swift
58 lines
2.3 KiB
Swift
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internal import CPlaydate
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extension Graphics {
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/// A collection of bitmaps loaded from an image table. Wraps `LCDBitmapTable`.
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public final class BitmapTable {
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let pointer: OpaquePointer
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init(pointer: OpaquePointer) {
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self.pointer = pointer
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}
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/// Allocates a table with room for `count` bitmaps of the given size.
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public convenience init(count: Int, width: Int, height: Int) {
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let pointer = gfx.pointee.newBitmapTable.unsafelyUnwrapped(Int32(count), Int32(width), Int32(height))
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self.init(pointer: pointer.unsafelyUnwrapped)
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}
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/// Loads an image table from a file.
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public convenience init(path: String) throws(PlaydateError) {
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var error: UnsafePointer<CChar>?
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let pointer = path.withPlaydateCString { gfx.pointee.loadBitmapTable.unsafelyUnwrapped($0, &error) }
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guard let pointer else { throw PlaydateError(cString: error) }
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self.init(pointer: pointer)
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}
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deinit {
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gfx.pointee.freeBitmapTable.unsafelyUnwrapped(pointer)
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}
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/// Replaces the table's contents with the image table at `path`.
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public func load(path: String) throws(PlaydateError) {
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var error: UnsafePointer<CChar>?
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path.withPlaydateCString { gfx.pointee.loadIntoBitmapTable.unsafelyUnwrapped($0, pointer, &error) }
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if let error { throw PlaydateError(cString: error) }
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}
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/// The bitmap at `index`, or `nil` if out of range. The bitmap
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/// references storage owned by the table; keep the table alive while
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/// using it.
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public func bitmap(at index: Int) -> Bitmap? {
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guard let bitmap = gfx.pointee.getTableBitmap.unsafelyUnwrapped(pointer, Int32(index)) else {
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return nil
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}
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return Bitmap(pointer: bitmap, isOwned: false)
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}
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/// The number of bitmaps in the table and the number of cells per row
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/// of the source image.
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public var info: (count: Int, cellsWide: Int) {
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var count: Int32 = 0, width: Int32 = 0
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gfx.pointee.getBitmapTableInfo.unsafelyUnwrapped(pointer, &count, &width)
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return (Int(count), Int(width))
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}
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public var count: Int { info.count }
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}
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}
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