note description: "An internal array of pixels." author: "Louis Marchand" date: "Sat, 02 Jan 2016 21:31:37 +0000" revision: "2.1" class interface GAME_PIXEL_BUFFER create make (a_item: POINTER; a_format: GAME_PIXEL_FORMAT_READABLE; a_width, a_height, a_pitch: INTEGER_32) -- Initialization for Current using a_item as item, a_format as pixel_format, -- a_width as width, a_height as height and a_pitch as pitch require exists: not a_item.is_default_pointer ensure item_not_null: not item.is_default_pointer item_set: item ~ a_item item_valid: is_valid feature -- Access generating_type: TYPE [detachable GAME_PIXEL_BUFFER] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty has_error: BOOLEAN -- Is the library has generate an error -- (from GAME_ERROR_MANAGER) height: INTEGER_32 -- Dimensions of the pixel array item: POINTER -- Memory pointer to the pixels array require pointer_valid: is_valid last_error: READABLE_STRING_GENERAL -- The last error generate by the library -- (from GAME_SDL_ANY) pitch: INTEGER_32 -- Length of a row of pixels in bytes pixel_format: GAME_PIXEL_FORMAT_READABLE width: INTEGER_32 -- Dimensions of the pixel array feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal alias "≡≡≡" (other: GAME_PIXEL_BUFFER): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: GAME_PIXEL_BUFFER): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal alias "≜" (other: GAME_PIXEL_BUFFER): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void is_valid: BOOLEAN -- item can be accessed same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) feature -- Duplication copy (other: GAME_PIXEL_BUFFER) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: GAME_PIXEL_BUFFER) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: GAME_PIXEL_BUFFER -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: GAME_PIXEL_BUFFER) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: GAME_PIXEL_BUFFER -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: GAME_PIXEL_BUFFER -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable GAME_PIXEL_BUFFER -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Access bits size boolean_bits: INTEGER_32 -- Number of bits in a value of type BOOLEAN -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Character_32_bits: INTEGER_32 = 32 -- Number of bits in a value of type CHARACTER_32 -- (from PLATFORM) Character_8_bits: INTEGER_32 = 8 -- Number of bits in a value of type CHARACTER_8 -- (from PLATFORM) Integer_16_bits: INTEGER_32 = 16 -- Number of bits in a value of type INTEGER_16 -- (from PLATFORM) Integer_32_bits: INTEGER_32 = 32 -- Number of bits in a value of type INTEGER_32 -- (from PLATFORM) Integer_64_bits: INTEGER_32 = 64 -- Number of bits in a value of type INTEGER_64 -- (from PLATFORM) Integer_8_bits: INTEGER_32 = 8 -- Number of bits in a value of type INTEGER_8 -- (from PLATFORM) Natural_16_bits: INTEGER_32 = 16 -- Number of bits in a value of type NATURAL_16 -- (from PLATFORM) Natural_32_bits: INTEGER_32 = 32 -- Number of bits in a value of type NATURAL_32 -- (from PLATFORM) Natural_64_bits: INTEGER_32 = 64 -- Number of bits in a value of type NATURAL_64 -- (from PLATFORM) Natural_8_bits: INTEGER_32 = 8 -- Number of bits in a value of type NATURAL_8 -- (from PLATFORM) pointer_bits: INTEGER_32 -- Number of bits in a value of type POINTER -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Real_32_bits: INTEGER_32 = 32 -- Number of bits in a value of type REAL_32 -- (from PLATFORM) Real_64_bits: INTEGER_32 = 64 -- Number of bits in a value of type REAL_64 -- (from PLATFORM) feature -- Access bytes size boolean_bytes: INTEGER_32 -- Number of bytes in a value of type BOOLEAN -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Character_32_bytes: INTEGER_32 = 4 -- Number of bytes in a value of type CHARACTER_32 -- (from PLATFORM) Character_8_bytes: INTEGER_32 = 1 -- Number of bytes in a value of type CHARACTER_8 -- (from PLATFORM) Integer_16_bytes: INTEGER_32 = 2 -- Number of bytes in a value of type INTEGER_16 -- (from PLATFORM) Integer_32_bytes: INTEGER_32 = 4 -- Number of bytes in a value of type INTEGER_32 -- (from PLATFORM) Integer_64_bytes: INTEGER_32 = 8 -- Number of bytes in a value of type INTEGER_64 -- (from PLATFORM) Integer_8_bytes: INTEGER_32 = 1 -- Number of bytes in a value of type INTEGER_8 -- (from PLATFORM) Natural_16_bytes: INTEGER_32 = 2 -- Number of bytes in a value of type NATURAL_16 -- (from PLATFORM) Natural_32_bytes: INTEGER_32 = 4 -- Number of bytes in a value of type NATURAL_32 -- (from PLATFORM) Natural_64_bytes: INTEGER_32 = 8 -- Number of bytes in a value of type NATURAL_64 -- (from PLATFORM) Natural_8_bytes: INTEGER_32 = 1 -- Number of bytes in a value of type NATURAL_8 -- (from PLATFORM) pointer_bytes: INTEGER_32 -- Number of bytes in a value of type POINTER -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Real_32_bytes: INTEGER_32 = 4 -- Number of bytes in a value of type REAL_32 -- (from PLATFORM) Real_64_bytes: INTEGER_32 = 8 -- Number of bytes in a value of type REAL_64 -- (from PLATFORM) feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform is_64_bits: BOOLEAN -- Is the current process runing in 64-bit mode -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_dotnet: BOOLEAN -- Are we targetting .NET? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Is_little_endian: BOOLEAN -- Is current platform a little endian one? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_mac: BOOLEAN -- Are we running on Mac OS? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_scoop_capable: BOOLEAN -- Is current platform capable of SCOOP? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_thread_capable: BOOLEAN -- Is current platform capable of multi-threading? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_unix: BOOLEAN -- Are we running on a Unix like platform? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_vms: BOOLEAN -- Are we running on VMS? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_vxworks: BOOLEAN -- Are we running on VxWorks? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class is_windows: BOOLEAN -- Are we running on Windows platform? -- (from PLATFORM) ensure -- from PLATFORM instance_free: class Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant exists: not has_error implies not item.is_default_pointer -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) end -- class GAME_PIXEL_BUFFER
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