Function blitShade

src/utils/ansiToPng.ts:181–205

(
  px: Uint8Array,
  width: number,
  x: number,
  y: number,
  fg: AnsiColor,
  bg: AnsiColor,
  alpha: number,
  scale: number,
)

}

function blitShade(
  px: Uint8Array,
  width: number,
  x: number,
  y: number,
  fg: AnsiColor,
  bg: AnsiColor,
  alpha: number,
  scale: number,
): void {
  const r = Math.round(fg.r * alpha + bg.r * (1 - alpha))
  const g = Math.round(fg.g * alpha + bg.g * (1 - alpha))
  const b = Math.round(fg.b * alpha + bg.b * (1 - alpha))
  const cellW = GLYPH_W * scale
  const cellH = GLYPH_H * scale
  for (let dy = 0; dy < cellH; dy++) {
    const rowBase = ((y + dy) * width + x) * 4
    for (let dx = 0; dx < cellW; dx++) {
      const i = rowBase + dx * 4
      px[i] = r
      px[i + 1] = g
      px[i + 2] = b
    }
  }
}

/**
 * Blit one glyph into the RGBA buffer at (x,y), scaled by `scale`