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simplify line rendering
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@poderosaproject
poderosaproject committed Feb 22, 2023
1 parent 9ca6e68 commit 9265d5e
Showing 1 changed file with 51 additions and 78 deletions.
129 changes: 51 additions & 78 deletions Core/GLine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -595,6 +595,8 @@ public sealed class GLine {

[ThreadStatic]
private static char[] _copyTempBuff;
[ThreadStatic]
private static int[] _copyDxBuff;

// Returns thread-local temporary buffer for internal use.
private char[] GetInternalTemporaryCharBuffer(int minLen) {
Expand All @@ -611,6 +613,15 @@ private char[] GetInternalTemporaryBufferForCopy() {
return GetInternalTemporaryCharBuffer(_cell.Length * 2);
}

// Returns thread-local temporary buffer for internal use.
private int[] GetInternalTemporaryDxBuffer(int minLen) {
int[] buff = _copyDxBuff;
if (buff == null || buff.Length < minLen) {
buff = _copyDxBuff = new int[minLen];
}
return buff;
}

/// <summary>
/// Length of the content in this line.
/// </summary>
Expand Down Expand Up @@ -1010,7 +1021,6 @@ public bool IsPeriodicRedrawRequired() {
/// <param name="y">top coordinate to paint the line</param>
internal void Render(IntPtr hdc, RenderProfile prof, Caret caret, Color baseBackColor, int x, int y) {
float fx0 = (float)x;
float fx1 = fx0;
int y1 = y;
int y2 = y1 + (int)prof.Pitch.Height;

Expand All @@ -1019,6 +1029,7 @@ internal void Render(IntPtr hdc, RenderProfile prof, Caret caret, Color baseBack
Win32.SetBkMode(hdc, Win32.TRANSPARENT);

int cellStart = 0;
float fx1 = fx0;

lock (this) {
// Note:
Expand Down Expand Up @@ -1055,110 +1066,72 @@ internal void Render(IntPtr hdc, RenderProfile prof, Caret caret, Color baseBack
Win32.SetBkColor(hdc, bkColorRef);
}

// If background fill is required, we call ExtTextOut() with ETO_OPAQUE to draw the first character.
float fx2 = fx0 + pitch * cellEnd;
Win32.RECT rect = new Win32.RECT((int)fx1, y1, (int)fx2, y2);

if (prof.DetermineBold(attr) || attr.Has(GAttrFlags.UseCjkFont)) {
// It is not always true that width of a character in the CJK font is twice of a character in the ASCII font.
// Characters are drawn one by one to adjust pitch.
char[] tmpCharBuf = GetInternalTemporaryCharBuffer((cellEnd - cellStart) * 2);
int tmpCharBufLen = 0;

char[] tmpCharBuf = GetInternalTemporaryCharBuffer(2);
if (isTextOpaque) {
int[] dxBuf = GetInternalTemporaryDxBuffer((cellEnd - cellStart) * 2);
int dxBufIndex = 0;

float curPosF = fx1;
int prevPos = (int)curPosF;
int cellIndex = cellStart;
float fx = fx1;

if (isBackgroundOpaque) {
// If background fill is required, we call ExtTextOut() with ETO_OPAQUE to draw the first character.
Win32.RECT rect = new Win32.RECT((int)fx1, y1, (int)fx2, y2);
if (isTextOpaque) {
GChar ch = NulToSpace(_cell[cellIndex].Char);
int len = ch.WriteTo(tmpCharBuf, 0);
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, len, null);
}
}

while (cellIndex < cellEnd) {
GChar ch = NulToSpace(_cell[cellIndex].Char);
int addedChars = ch.WriteTo(tmpCharBuf, tmpCharBufLen);
tmpCharBufLen += addedChars;
if (ch.IsWideWidth) {
if (ch.IsLeftHalf) {
cellIndex += 2;
fx = fx + pitch + pitch;
curPosF = curPosF + pitch + pitch;
}
else {
cellIndex += 1;
fx = fx + pitch;
cellIndex++;
curPosF += pitch;
}
}
else {
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, 0, null);
}
}
cellIndex++;
curPosF += pitch;
}
int nextPos = (int)curPosF;
dxBuf[dxBufIndex++] = nextPos - prevPos;
while (--addedChars > 0) {
dxBuf[dxBufIndex++] = 0;
}
prevPos = nextPos;
}

if (isTextOpaque) {
while (cellIndex < cellEnd) {
GChar ch = NulToSpace(_cell[cellIndex].Char);
int len = ch.WriteTo(tmpCharBuf, 0);
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, (int)fx, y1, 0, null, p, len, null);
}
}

if (ch.IsLeftHalf) {
cellIndex += 2;
fx = fx + pitch + pitch;
unsafe {
fixed (int* pDx = dxBuf)
fixed (char* p = tmpCharBuf) {
if (isBackgroundOpaque) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, tmpCharBufLen, pDx);
}
else {
cellIndex += 1;
fx = fx + pitch;
Win32.ExtTextOut(hdc, rect.left, rect.top, 0, null, p, tmpCharBufLen, pDx);
}
}
}
}
else {
char[] tmpCharBuf = GetInternalTemporaryCharBuffer((cellEnd - cellStart) * 2);
int bufLen = 0;
for (int i = cellStart; i < cellEnd; i++) {
bufLen += NulToSpace(_cell[i].Char).WriteTo(tmpCharBuf, bufLen);
}

if (isBackgroundOpaque) {
Win32.RECT rect = new Win32.RECT((int)fx1, y1, (int)fx2, y2);
if (isTextOpaque) {
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, bufLen, null);
}
}
}
else {
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, 0, null);
}
}
}
if (attr.Has(GAttrFlags.Underlined)) {
DrawUnderline(hdc, foreColorRef, (int)fx1, y2 - 1, (int)fx2 - (int)fx1);
}
else {
if (isTextOpaque) {
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, (int)fx1, y1, 0, null, p, bufLen, null);
}
}
}
else if (isBackgroundOpaque) {
unsafe {
fixed (char* p = tmpCharBuf) {
Win32.ExtTextOut(hdc, rect.left, rect.top, Win32.ETO_OPAQUE, &rect, p, 0, null);
}
}
}

if (attr.Has(GAttrFlags.Underlined) && isTextOpaque) {
DrawUnderline(hdc, foreColorRef, (int)fx1, y2 - 1, (int)fx2 - (int)fx1);
}

fx1 = fx2;

cellStart = cellEnd;
fx1 = fx2;
}
}
}
Expand Down

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