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[rtextures] ImageTextEx(): use MeasureTextEx() line spacing, fix multiline scaling #6311

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Merged
raysan5 merged 2 commits into from
Oct 22, 2026
+19 −8
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[rtextures] ImageTextEx(): use MeasureTextEx() line spacing, fix multiline scaling #6311

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[rtextures] ImageTextEx(): use MeasureTextEx() line spacing, fix mult…
drgropp Oct 20, 2026
3d97fed
Keep ImageTextEx offsets as integers
drgropp Oct 21, 2026
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27 changes: 19 additions & 8 deletions src/rtextures.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1556,13 +1556,25 @@
int textLength = (int)strlen(text); // Get length of text in bytes
int textOffsetX = 0; // Image drawing position X
int textOffsetY = 0; // Offset between lines (on linebreak '\n')
int lineIndex = 0; // Current line index (on linebreak '\n')

// NOTE: Text image is generated at font base size, later scaled to desired font size
Vector2 imSize = MeasureTextEx(font, text, (float)font.baseSize, spacing); // WARNING: Module required: rtext
Vector2 textSize = MeasureTextEx(font, text, fontSize, spacing);

int lineBreakCount = 0; // Number of line breaks ('\n') in text
for (int i = 0; i < textLength; i++)
{
if (text[i] == '\n') lineBreakCount++;
}

float lineSpacing = 0.0f; // Line spacing, as used by MeasureTextEx()
if (lineBreakCount > 0) lineSpacing = (textSize.y - fontSize)/lineBreakCount - fontSize;

float lineStep = (float)font.baseSize + lineSpacing*(float)font.baseSize/fontSize; // Line advance at base size

// Create image to store text
imText = GenImageColor((int)imSize.x, (int)imSize.y, BLANK);
imText = GenImageColor((int)imSize.x, font.baseSize + (int)(lineBreakCount*lineStep), BLANK);

for (int i = 0; i < textLength;)
{
Expand All @@ -1573,9 +1585,8 @@

if (codepoint == '\n')
{
// NOTE: Fixed line spacing of 1.5 line-height
// TODO: Support custom line spacing defined by user
textOffsetY += (font.baseSize + font.baseSize/2);
lineIndex++;
textOffsetY = (int)(lineIndex*lineStep);
textOffsetX = 0;
}
else
Expand All @@ -1595,15 +1606,15 @@
}

// Scale image depending on text size
if (textSize.y != imSize.y)
if (fontSize != (float)font.baseSize)
{
float scaleFactor = textSize.y/imSize.y;
float scaleFactor = fontSize/(float)font.baseSize;
TRACELOG(LOG_INFO, "IMAGE: Text scaled by factor: %f", scaleFactor);

// Using nearest-neighbor scaling algorithm for default font
// TODO: Support other scaling mechanism, use flag?
if (font.texture.id == GetFontDefault().texture.id) ImageResizeNN(&imText, (int)(imSize.x*scaleFactor), (int)(imSize.y*scaleFactor));
else ImageResize(&imText, (int)(imSize.x*scaleFactor), (int)(imSize.y*scaleFactor));
if (font.texture.id == GetFontDefault().texture.id) ImageResizeNN(&imText, (int)(imText.width*scaleFactor), (int)(imText.height*scaleFactor));
else ImageResize(&imText, (int)(imText.width*scaleFactor), (int)(imText.height*scaleFactor));
}
#else
imText = GenImageColor(200, 60, BLACK); // Generating placeholder black image rectangle
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