/// <summary>
/// Writes the specified metadata to the <see cref="TextLayoutCommandType.LineInfo"/> command for this text.
/// </summary>
/// <param name="output">The command stream to which commands are being written.</param>
/// <param name="lineWidth">The width of the line in pixels.</param>
/// <param name="lineHeight">The height of the line in pixels.</param>
/// <param name="lengthInCommands">The length of the line of text in commands.</param>
/// <param name="lengthInGlyphs">The length of the line of text in glyphs.</param>
/// <param name="terminatedByLineBreak">A value indicating whether the line is terminated by a line break.</param>
/// <param name="settings">The layout settings.</param>
public void WriteLineInfo(TextLayoutCommandStream output,
Int32 lineWidth, Int32 lineHeight, Int32 lengthInCommands, Int32 lengthInGlyphs, Boolean terminatedByLineBreak, ref TextLayoutSettings settings)
{
var offset = 0;
if (settings.Width.HasValue)
{
if ((settings.Flags & TextFlags.AlignRight) == TextFlags.AlignRight)
{
offset = (settings.Width.Value - lineWidth);
}
else if ((settings.Flags & TextFlags.AlignCenter) == TextFlags.AlignCenter)
{
offset = (settings.Width.Value - lineWidth) / 2;
}
}
var outputStreamPosition = output.StreamPositionInObjects;
output.Seek(lineInfoCommandIndex);
unsafe
{
var ptr = (TextLayoutLineInfoCommand *)output.Data;
ptr->Offset = offset;
ptr->LineWidth = lineWidth;
ptr->LineHeight = lineHeight;
ptr->LengthInCommands = lengthInCommands;
ptr->LengthInGlyphs = lengthInGlyphs;
ptr->TerminatedByLineBreak = terminatedByLineBreak;
}
output.Seek(outputStreamPosition);
minLineOffset = (minLineOffset.HasValue) ? Math.Min(minLineOffset.Value, offset) : offset;
}
/// <summary>
/// Writes the specified metadata to the <see cref="TextLayoutCommandType.BlockInfo"/> command for this text.
/// </summary>
/// <param name="output">The command stream to which commands are being written.</param>
/// <param name="blockWidth">The width of the block in pixels.</param>
/// <param name="blockHeight">The height of the block in pixels.</param>
/// <param name="lengthInLines">The length of the block of text in lines.</param>
/// <param name="settings">The layout settings.</param>
public void WriteBlockInfo(TextLayoutCommandStream output, Int32 blockWidth, Int32 blockHeight, Int32 lengthInLines, ref TextLayoutSettings settings)
{
var offset = 0;
if (settings.Height.HasValue)
{
if ((settings.Flags & TextFlags.AlignBottom) == TextFlags.AlignBottom)
{
offset = (settings.Height.Value - blockHeight);
}
else if ((settings.Flags & TextFlags.AlignMiddle) == TextFlags.AlignMiddle)
{
offset = (settings.Height.Value - blockHeight) / 2;
}
}
output.Seek(0);
unsafe
{
var ptr = (TextLayoutBlockInfoCommand *)output.Data;
ptr->Offset = offset;
ptr->LengthInLines = lengthInLines;
}
output.Seek(output.Count);
minBlockOffset = (minBlockOffset.HasValue) ? Math.Min(minBlockOffset.Value, offset) : offset;
}
/// <summary>
/// This method corrects the offsets of lines in a layout which is right- or center-aligned but which
/// did not have a constrained horizontal layout space.
/// </summary>
private unsafe void FixHorizontalAlignmentForUnconstrainedLayout(TextLayoutCommandStream output, ref TextLayoutSettings settings)
{
output.Seek(0);
while (output.SeekNextLine())
{
var lineInfo = (TextLayoutLineInfoCommand *)output.InternalObjectStream.Data;
if ((settings.Flags & TextFlags.AlignRight) == TextFlags.AlignRight)
{
lineInfo->Offset = (output.ActualWidth - lineInfo->LineWidth);
}
else if ((settings.Flags & TextFlags.AlignCenter) == TextFlags.AlignCenter)
{
lineInfo->Offset = (output.ActualWidth - lineInfo->LineWidth) / 2;
}
}
}
/// <summary>
/// Replaces the last breaking space on the current line with a line break.
/// </summary>
/// <param name="output">The <see cref="TextLayoutCommandStream"/> which is being populated.</param>
/// <param name="settings">The current layout settings.</param>
public unsafe Boolean ReplaceLastBreakingSpaceWithLineBreak(TextLayoutCommandStream output, ref TextLayoutSettings settings)
{
if (!lineBreakCommand.HasValue || !lineBreakOffset.HasValue)
{
return(false);
}
var sizeBeforeBreak = brokenTextSizeBeforeBreak.Value;
var sizeAfterBreak = brokenTextSizeAfterBreak.Value;
var brokenCommandSize = Size2.Zero;
var brokenCommandOffset = 0;
var brokenCommandLength = 0;
var newLineHeight = sizeAfterBreak.Height;
if (newLineHeight == 0)
{
newLineHeight = settings.Font.GetFace(UltravioletFontStyle.Regular).LineSpacing;
}
// Truncate the command which is being broken.
output.Seek(lineBreakCommand.Value);
unsafe
{
var cmd = (TextLayoutTextCommand *)output.Data;
brokenCommandOffset = cmd->TextOffset;
brokenCommandLength = cmd->TextLength;
brokenCommandSize = cmd->Bounds.Size;
cmd->TextLength = lineBreakOffset.Value;
cmd->TextWidth = (Int16)sizeBeforeBreak.Width;
cmd->TextHeight = (Int16)sizeBeforeBreak.Height;
}
output.SeekNextCommand();
// Insert a line break, a new line, and the second half of the truncated text.
var part1Length = lineBreakOffset.Value;
var part2Offset = brokenCommandOffset + (lineBreakOffset.Value + 1);
var part2Length = brokenCommandLength - (part1Length + 1);
var part2IsNotDegenerate = (part2Length > 0);
var numberOfObjects = part2IsNotDegenerate ? 3 : 2;
var numberOfBytes =
sizeof(TextLayoutLineBreakCommand) +
sizeof(TextLayoutLineInfoCommand) +
(part2IsNotDegenerate ? sizeof(TextLayoutTextCommand) : 0);
var insertionPosition = output.InternalObjectStream.PositionInObjects;
output.InternalObjectStream.ReserveInsert(numberOfObjects, numberOfBytes);
*(TextLayoutLineBreakCommand *)output.Data = new TextLayoutLineBreakCommand(1);
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutLineBreakCommand));
*(TextLayoutCommandType *)output.Data = TextLayoutCommandType.LineInfo;
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutLineInfoCommand));
if (part2IsNotDegenerate)
{
var textOffset = part2Offset;
var textLength = part2Length;
*(TextLayoutTextCommand *)output.InternalObjectStream.Data = new TextLayoutTextCommand(textOffset, textLength,
0, positionY + lineHeight, (Int16)sizeAfterBreak.Width, (Int16)sizeAfterBreak.Height);
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutTextCommand));
}
// Add the line break command to the broken line.
AdvanceLineToNextCommand(0, 0, 1, 1);
// Recalculate the parameters for the broken line.
output.Seek(LineInfoCommandIndex + 1);
var brokenLineWidth = 0;
var brokenLineHeight = 0;
var brokenLineLengthInText = 0;
var brokenLineLengthInCommands = 0;
var cmdType = TextLayoutCommandType.None;
while ((cmdType = *(TextLayoutCommandType *)output.Data) != TextLayoutCommandType.LineInfo)
{
switch (cmdType)
{
case TextLayoutCommandType.Text:
{
var cmd = (TextLayoutTextCommand *)output.Data;
brokenLineWidth += cmd->TextWidth;
brokenLineHeight = Math.Max(brokenLineHeight, cmd->TextHeight);
brokenLineLengthInText += cmd->TextLength;
}
break;
case TextLayoutCommandType.Icon:
{
var cmd = (TextLayoutIconCommand *)output.Data;
brokenLineWidth += cmd->Bounds.Width;
brokenLineHeight = Math.Max(brokenLineHeight, cmd->Bounds.Height);
brokenLineLengthInText += 1;
}
break;
case TextLayoutCommandType.LineBreak:
{
var cmd = (TextLayoutLineBreakCommand *)output.Data;
brokenLineLengthInText += cmd->Length;
}
break;
}
brokenLineLengthInCommands++;
output.SeekNextCommand();
}
// Finalize the broken line.
totalLength = (totalLength - lineLengthInText) + brokenLineLengthInText;
lineWidth = brokenLineWidth;
lineHeight = brokenLineHeight;
lineLengthInText = brokenLineLengthInText;
lineLengthInCommands = brokenLineLengthInCommands;
FinalizeLine(output, ref settings);
// Fixup token bounds and update parameters for new line.
LineInfoCommandIndex = insertionPosition + 1;
while (output.StreamPositionInObjects < output.Count)
{
var width = 0;
var height = 0;
var lengthInCommands = 0;
var lengthInText = 0;
switch (*(TextLayoutCommandType *)output.Data)
{
case TextLayoutCommandType.Text:
{
var cmd = (TextLayoutTextCommand *)output.Data;
width = cmd->TextWidth;
height = cmd->TextHeight;
lengthInCommands = 1;
lengthInText = cmd->TextLength;
cmd->TextX = PositionX;
cmd->TextY = PositionY;
}
break;
case TextLayoutCommandType.Icon:
{
var cmd = (TextLayoutIconCommand *)output.Data;
width = cmd->IconWidth;
height = cmd->IconHeight;
lengthInCommands = 1;
lengthInText = 1;
cmd->IconX = PositionX;
cmd->IconY = PositionY;
}
break;
case TextLayoutCommandType.LineBreak:
{
var cmd = (TextLayoutLineBreakCommand *)output.Data;
lengthInText += cmd->Length;
}
break;
}
AdvanceLineToNextCommand(width, height, lengthInCommands, lengthInText);
output.SeekNextCommand();
}
return(true);
}
/// <summary>
/// Replaces the last breaking space on the current line with a line break.
/// </summary>
/// <param name="output">The <see cref="TextLayoutCommandStream"/> which is being populated.</param>
/// <param name="settings">The current layout settings.</param>
public unsafe Boolean ReplaceLastBreakingSpaceWithLineBreak(TextLayoutCommandStream output, ref TextLayoutSettings settings)
{
if (!LineBreakCommand.HasValue || !LineBreakOffsetInput.HasValue || !LineBreakOffsetOutput.HasValue)
{
return(false);
}
var sizeBeforeBreak = BrokenTextSizeBeforeBreak.Value;
var sizeAfterBreak = BrokenTextSizeAfterBreak.Value;
var brokenCommandSize = Size2.Zero;
var brokenCommandGlyphOffset = 0;
var brokenCommandGlyphLength = 0;
var brokenCommandSourceOffset = 0;
var brokenCommandSourceLength = 0;
var brokenCommandShapedOffset = 0;
var brokenCommandShapedLength = 0;
var newLineHeight = sizeAfterBreak.Height;
if (newLineHeight == 0)
{
newLineHeight = settings.Font.GetFace(UltravioletFontStyle.Regular).LineSpacing;
}
// Truncate the command which is being broken.
output.Seek(LineBreakCommand.Value);
unsafe
{
var cmd = (TextLayoutTextCommand *)output.Data;
var shape = (settings.Options & TextLayoutOptions.Shape) == TextLayoutOptions.Shape;
brokenCommandGlyphOffset = cmd->GlyphOffset;
brokenCommandGlyphLength = cmd->GlyphLength;
brokenCommandSourceOffset = cmd->SourceOffset;
brokenCommandSourceLength = cmd->SourceLength;
brokenCommandShapedOffset = cmd->ShapedOffset;
brokenCommandShapedLength = cmd->ShapedLength;
brokenCommandSize = cmd->Bounds.Size;
cmd->GlyphLength = LineBreakOffsetOutput.Value;
cmd->SourceLength = LineBreakOffsetInput.Value;
cmd->ShapedOffset = (shape && settings.Direction == TextDirection.RightToLeft) ? cmd->ShapedOffset + 1 : cmd->ShapedOffset;
cmd->ShapedLength = LineBreakOffsetOutput.Value;
cmd->TextWidth = (Int16)sizeBeforeBreak.Width;
cmd->TextHeight = (Int16)sizeBeforeBreak.Height;
}
output.SeekNextCommand();
// Insert a line break, a new line, and the second half of the truncated text.
var part1GlyphLength = LineBreakOffsetOutput.Value;
var part1SourceLength = LineBreakOffsetInput.Value;
var part1ShapedLength = LineBreakOffsetOutput.Value;
var part2GlyphOffset = brokenCommandGlyphOffset + (LineBreakOffsetOutput.Value + 1);
var part2GlyphLength = brokenCommandGlyphLength - (part1GlyphLength + 1);
var part2SourceOffset = brokenCommandSourceOffset + (LineBreakOffsetInput.Value + 1);
var part2SourceLength = brokenCommandSourceLength - (part1SourceLength + 1);
var part2ShapedOffset = brokenCommandShapedOffset + (LineBreakOffsetOutput.Value + 1);
var part2ShapedLength = brokenCommandShapedLength - (part1ShapedLength + 1);
var part2IsNotDegenerate = (part2GlyphLength > 0);
var numberOfObjects = part2IsNotDegenerate ? 3 : 2;
var numberOfBytes =
sizeof(TextLayoutLineBreakCommand) +
sizeof(TextLayoutLineInfoCommand) +
(part2IsNotDegenerate ? sizeof(TextLayoutTextCommand) : 0);
var insertionPosition = output.InternalObjectStream.PositionInObjects;
output.InternalObjectStream.ReserveInsert(numberOfObjects, numberOfBytes);
*(TextLayoutLineBreakCommand *)output.Data = new TextLayoutLineBreakCommand(part2GlyphOffset - 1, 1, brokenCommandSourceOffset + part1SourceLength, 1);
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutLineBreakCommand));
*(TextLayoutCommandType *)output.Data = TextLayoutCommandType.LineInfo;
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutLineInfoCommand));
if (part2IsNotDegenerate)
{
var glyphOffset = part2GlyphOffset;
var glyphLength = part2GlyphLength;
var sourceOffset = part2SourceOffset;
var sourceLength = part2SourceLength;
var shapedOffset = part2ShapedOffset;
var shapedLength = part2ShapedLength;
*(TextLayoutTextCommand *)output.InternalObjectStream.Data = new TextLayoutTextCommand(
glyphOffset, glyphLength, sourceOffset, sourceLength, shapedOffset, shapedLength,
0, PositionY + LineHeight, (Int16)sizeAfterBreak.Width, (Int16)sizeAfterBreak.Height);
output.InternalObjectStream.FinalizeObject(sizeof(TextLayoutTextCommand));
}
// Add the line break command to the broken line.
AdvanceLineToNextCommand(0, 0, 1, 1, 1, 1);
// Recalculate the parameters for the broken line.
output.Seek(LineInfoCommandIndex + 1);
var brokenLineWidth = 0;
var brokenLineHeight = 0;
var brokenLineLengthInGlyphs = 0;
var brokenLineLengthInSource = 0;
var brokenLineLengthInShaped = 0;
var brokenLineLengthInCommands = 0;
var cmdType = TextLayoutCommandType.None;
while ((cmdType = *(TextLayoutCommandType *)output.Data) != TextLayoutCommandType.LineInfo)
{
switch (cmdType)
{
case TextLayoutCommandType.Text:
{
var cmd = (TextLayoutTextCommand *)output.Data;
brokenLineWidth += cmd->TextWidth;
brokenLineHeight = Math.Max(brokenLineHeight, cmd->TextHeight);
brokenLineLengthInGlyphs += cmd->GlyphLength;
brokenLineLengthInSource += cmd->SourceLength;
brokenLineLengthInShaped += cmd->ShapedLength;
}
break;
case TextLayoutCommandType.Icon:
{
var cmd = (TextLayoutIconCommand *)output.Data;
brokenLineWidth += cmd->Bounds.Width;
brokenLineHeight = Math.Max(brokenLineHeight, cmd->Bounds.Height);
brokenLineLengthInGlyphs += 1;
brokenLineLengthInSource += cmd->SourceLength;
}
break;
case TextLayoutCommandType.LineBreak:
{
var cmd = (TextLayoutLineBreakCommand *)output.Data;
brokenLineLengthInGlyphs += cmd->GlyphLength;
brokenLineLengthInShaped += 1;
brokenLineLengthInSource += cmd->SourceLength;
}
break;
}
brokenLineLengthInCommands++;
output.SeekNextCommand();
}
// Finalize the broken line.
terminatingLineBreakLength = 1;
TotalSourceLength = (TotalSourceLength - LineLengthInSource) + brokenLineLengthInSource;
TotalShapedLength = (TotalShapedLength - LineLengthInShaped) + brokenLineLengthInShaped;
TotalGlyphLength = (TotalGlyphLength - LineLengthInGlyphs) + brokenLineLengthInGlyphs;
LineWidth = brokenLineWidth;
LineHeight = brokenLineHeight;
LineLengthInSource = brokenLineLengthInSource;
LineLengthInShaped = brokenLineLengthInShaped;
LineLengthInGlyphs = brokenLineLengthInGlyphs;
LineLengthInCommands = brokenLineLengthInCommands;
FinalizeLine(output, ref settings);
// Fixup token bounds and update parameters for new line.
LineInfoCommandIndex = insertionPosition + 1;
while (output.StreamPositionInObjects < output.Count)
{
var width = 0;
var height = 0;
var lengthInCommands = 0;
var lengthInGlyphs = 0;
var lengthInSource = 0;
var lengthInShaped = 0;
switch (*(TextLayoutCommandType *)output.Data)
{
case TextLayoutCommandType.Text:
{
var cmd = (TextLayoutTextCommand *)output.Data;
width = cmd->TextWidth;
height = cmd->TextHeight;
lengthInCommands = 1;
lengthInGlyphs = cmd->GlyphLength;
lengthInSource = cmd->SourceLength;
lengthInShaped = cmd->ShapedLength;
cmd->TextX = PositionX;
cmd->TextY = PositionY;
}
break;
case TextLayoutCommandType.Icon:
{
var cmd = (TextLayoutIconCommand *)output.Data;
width = cmd->IconWidth;
height = cmd->IconHeight;
lengthInCommands = 1;
lengthInGlyphs = 1;
lengthInSource = cmd->SourceLength;
lengthInShaped = 0;
cmd->IconX = PositionX;
cmd->IconY = PositionY;
}
break;
case TextLayoutCommandType.LineBreak:
{
var cmd = (TextLayoutLineBreakCommand *)output.Data;
lengthInGlyphs = cmd->GlyphLength;
lengthInSource = cmd->SourceLength;
lengthInShaped = 0;
}
break;
}
AdvanceLineToNextCommand(width, height, lengthInCommands, lengthInGlyphs, lengthInSource, lengthInShaped);
output.SeekNextCommand();
}
return(true);
}