Function compressImageBlock

src/utils/imageResizer.ts:615–643

(
  imageBlock: ImageBlockParam,
  maxBytes: number = IMAGE_TARGET_RAW_SIZE,
)

 * Wrapper around compressImageBuffer for ImageBlockParam.
 */
export async function compressImageBlock(
  imageBlock: ImageBlockParam,
  maxBytes: number = IMAGE_TARGET_RAW_SIZE,
): Promise<ImageBlockParam> {
  // Only process base64 images
  if (imageBlock.source.type !== 'base64') {
    return imageBlock
  }

  // Decode base64 to buffer
  const imageBuffer = Buffer.from(imageBlock.source.data, 'base64')

  // Check if already within size limit
  if (imageBuffer.length <= maxBytes) {
    return imageBlock
  }

  // Compress the image
  const compressed = await compressImageBuffer(imageBuffer, maxBytes)

  return {
    type: 'image',
    source: {
      type: 'base64',
      media_type: compressed.mediaType,
      data: compressed.base64,
    },
  }
}

// Helper functions for compression pipeline