PNGText

calculateOptimumDensity ubyte calculateOptimumDensity(int n): Calculates the least density that can be used to store n bytes into loaded image.
capacity int capacity(ubyte density)
decode void decode(): decodes data from loaded image
encode void encode(): encodes data into loaded image.
load void load(): Loads an image.
save void save(): Saves an image

Properties

data ubyte[] data [@property getter]
ubyte[] data [@property setter]
filename string filename [@property getter]
string filename [@property setter]
imageLoaded bool imageLoaded [@property getter]

Static functions

densityName string densityName(ubyte density)
isValidDensity bool isValidDensity(ubyte density): Checks if a number is a valid value for use as storage density
qualityName string qualityName(ubyte density)

Examples

writeln("pngtext.d unittests:");
import std.stdio : writeln;
import std.conv : to;
writeln("unittests for PNGText.splitByte and PNGText.joinByte started");
// splitByte
ubyte[] bytes;
bytes.length = 8;
bytes[] = 128;
PNGText.splitByte(cast(ubyte)0B10101010, cast(ubyte)0, bytes);
assert(bytes == [128, 129, 128, 129, 128, 129, 128, 129]);
assert(PNGText.joinByte(bytes, cast(ubyte)0) == 0B10101010);

PNGText.splitByte(cast(ubyte)0B10101010, cast(ubyte)1, bytes);
assert(bytes[0 .. 4] == [130, 130, 130, 130]);
assert(PNGText.joinByte(bytes[0 .. 4], cast(ubyte)1) == 0B10101010);

PNGText.splitByte(cast(ubyte)0B10101010, cast(ubyte)2, bytes);
assert(bytes[0 .. 2] == [0B10001010, 0B10001010]);
assert(PNGText.joinByte(bytes[0 .. 2], cast(ubyte)2) == 0B10101010);

PNGText.splitByte(cast(ubyte)0B10101010, cast(ubyte)3, bytes);
assert(bytes[0] == 0B10101010);
assert(PNGText.joinByte(bytes[0 .. 1], cast(ubyte)3) == 0B10101010);

writeln("unittests for PNGText.writeHeader and PNGText.readHeader started");
// write some stuff
PNGText obj = new PNGText();
obj.createDummyStream(1024);
obj._stream[] = 0B01011100;
bytes.length = HEADER_LENGTH;
bytes = [215, 1, 0];
obj.writeHeader(bytes);
assert (obj.readHeader == bytes);
// write some more stuff
bytes[] = 0B00111100;
obj.writeHeader(bytes);
assert(obj.readHeader == [0B00111100, 0B00111100, 0B00111100]);

writeln("unittests for PNGText.encodeDataToStream and PNGText.decodeDataFromStream started");
bytes.length = 100;
foreach (i; 0 .. bytes.length){
	bytes[i] = cast(ubyte)i;
}
foreach (density; DENSITIES){
	obj._data = bytes.dup;
	writeln("\tencoding with density=",density);
	obj.encodeDataToStream(density);
	obj._data[] = 0;
	writeln("\tdecoding with density=",density);
	obj.decodeDataFromStream(density, 100);
	assert(obj._data == bytes);
}
writeln("pngtext.d unittests over");

PNGText

Constructors

Destructor

Members

Functions

Properties

Static functions

Examples

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