Module: SafeImage::Native

Defined in:
ext/safe_image_native/safe_image_native.c

Class Method Summary collapse

Class Method Details

.crop_north(input_val, output_val, width_val, height_val, format_val, quality_val, max_pixels_val) ⇒ Object 



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# File 'ext/safe_image_native/safe_image_native.c', line 306

static VALUE rb_crop_north(VALUE self, VALUE input_val, VALUE output_val, VALUE width_val, VALUE height_val, VALUE format_val, VALUE quality_val, VALUE max_pixels_val) {
  Check_Type(input_val, T_STRING);
  Check_Type(output_val, T_STRING);
  Check_Type(format_val, T_STRING);
  int width = NUM2INT(width_val);
  int height = NUM2INT(height_val);
  int quality = NUM2INT(quality_val);
  validate_dimensions_or_raise(width, height);
  validate_quality_or_raise(quality);
  const char *out_fmt = normalized_format(StringValueCStr(format_val));
  if (!out_fmt || strcmp(out_fmt, "heic") == 0) rb_raise(eUnsupported, "unsupported output format");

  double start = now_ms();
  const char *input_fmt = NULL;
  VipsImage *in = load_explicit(StringValueCStr(input_val), &input_fmt);
  long long pixels = 0, max_pixels = 0;
  if (pixels_exceed_limit(in, max_pixels_val, &pixels, &max_pixels)) {
    g_object_unref(in);
    raise_pixels_limit(pixels, max_pixels);
  }

  VipsImage *rot = NULL;
  if (vips_autorot(in, &rot, NULL) != 0) {
    g_object_unref(in);
    raise_vips();
  }

  double sx = (double)width / (double)rot->Xsize;
  double sy = (double)height / (double)rot->Ysize;
  double scale = sx > sy ? sx : sy;
  scale *= 1.0000001;

  VipsImage *resized = NULL;
  if (vips_resize(rot, &resized, scale, NULL) != 0) {
    g_object_unref(rot);
    g_object_unref(in);
    raise_vips();
  }

  int left = (resized->Xsize - width) / 2;
  if (left < 0) left = 0;

  VipsImage *crop = NULL;
  if (vips_extract_area(resized, &crop, left, 0, width, height, NULL) != 0) {
    g_object_unref(resized);
    g_object_unref(rot);
    g_object_unref(in);
    raise_vips();
  }

  if (save_explicit(crop, StringValueCStr(output_val), out_fmt, quality) != 0) {
    g_object_unref(crop);
    g_object_unref(resized);
    g_object_unref(rot);
    g_object_unref(in);
    raise_vips();
  }

  int out_width = crop->Xsize;
  int out_height = crop->Ysize;
  double duration_ms = now_ms() - start;
  g_object_unref(crop);
  g_object_unref(resized);
  g_object_unref(rot);
  g_object_unref(in);

  VALUE hash = rb_hash_new();
  rb_hash_aset(hash, ID2SYM(rb_intern("input_format")), rb_str_new_cstr(input_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("output_format")), rb_str_new_cstr(out_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("width")), INT2NUM(out_width));
  rb_hash_aset(hash, ID2SYM(rb_intern("height")), INT2NUM(out_height));
  rb_hash_aset(hash, ID2SYM(rb_intern("duration_ms")), DBL2NUM(duration_ms));
  return hash;
}

.probe(path_val) ⇒ Object 



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# File 'ext/safe_image_native/safe_image_native.c', line 171

static VALUE rb_probe(VALUE self, VALUE path_val) {
  Check_Type(path_val, T_STRING);
  double start = now_ms();
  const char *fmt = NULL;
  VipsImage *image = load_explicit(StringValueCStr(path_val), &fmt);
  int width = image->Xsize;
  int height = image->Ysize;
  double duration_ms = now_ms() - start;
  g_object_unref(image);

  VALUE hash = rb_hash_new();
  rb_hash_aset(hash, ID2SYM(rb_intern("format")), rb_str_new_cstr(fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("width")), INT2NUM(width));
  rb_hash_aset(hash, ID2SYM(rb_intern("height")), INT2NUM(height));
  rb_hash_aset(hash, ID2SYM(rb_intern("duration_ms")), DBL2NUM(duration_ms));
  return hash;
}

.resize(input_val, output_val, scale_val, format_val, quality_val, max_pixels_val) ⇒ Object 



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# File 'ext/safe_image_native/safe_image_native.c', line 250

static VALUE rb_resize(VALUE self, VALUE input_val, VALUE output_val, VALUE scale_val, VALUE format_val, VALUE quality_val, VALUE max_pixels_val) {
  Check_Type(input_val, T_STRING);
  Check_Type(output_val, T_STRING);
  Check_Type(format_val, T_STRING);
  double scale = NUM2DBL(scale_val);
  int quality = NUM2INT(quality_val);
  validate_scale_or_raise(scale);
  validate_quality_or_raise(quality);
  const char *out_fmt = normalized_format(StringValueCStr(format_val));
  if (!out_fmt || strcmp(out_fmt, "heic") == 0) rb_raise(eUnsupported, "unsupported output format");

  double start = now_ms();
  const char *input_fmt = NULL;
  VipsImage *in = load_explicit(StringValueCStr(input_val), &input_fmt);
  long long pixels = 0, max_pixels = 0;
  if (pixels_exceed_limit(in, max_pixels_val, &pixels, &max_pixels)) {
    g_object_unref(in);
    raise_pixels_limit(pixels, max_pixels);
  }

  VipsImage *rot = NULL;
  if (vips_autorot(in, &rot, NULL) != 0) {
    g_object_unref(in);
    raise_vips();
  }

  VipsImage *out = NULL;
  if (vips_resize(rot, &out, scale, NULL) != 0) {
    g_object_unref(rot);
    g_object_unref(in);
    raise_vips();
  }

  if (save_explicit(out, StringValueCStr(output_val), out_fmt, quality) != 0) {
    g_object_unref(out);
    g_object_unref(rot);
    g_object_unref(in);
    raise_vips();
  }

  int out_width = out->Xsize;
  int out_height = out->Ysize;
  double duration_ms = now_ms() - start;
  g_object_unref(out);
  g_object_unref(rot);
  g_object_unref(in);

  VALUE hash = rb_hash_new();
  rb_hash_aset(hash, ID2SYM(rb_intern("input_format")), rb_str_new_cstr(input_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("output_format")), rb_str_new_cstr(out_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("width")), INT2NUM(out_width));
  rb_hash_aset(hash, ID2SYM(rb_intern("height")), INT2NUM(out_height));
  rb_hash_aset(hash, ID2SYM(rb_intern("duration_ms")), DBL2NUM(duration_ms));
  return hash;
}

.thumbnail(input_val, output_val, width_val, height_val, format_val, quality_val, max_pixels_val) ⇒ Object 



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# File 'ext/safe_image_native/safe_image_native.c', line 189

static VALUE rb_thumbnail(VALUE self, VALUE input_val, VALUE output_val, VALUE width_val, VALUE height_val, VALUE format_val, VALUE quality_val, VALUE max_pixels_val) {
  Check_Type(input_val, T_STRING);
  Check_Type(output_val, T_STRING);
  Check_Type(format_val, T_STRING);
  int width = NUM2INT(width_val);
  int height = NUM2INT(height_val);
  int quality = NUM2INT(quality_val);
  validate_dimensions_or_raise(width, height);
  validate_quality_or_raise(quality);
  const char *out_fmt = normalized_format(StringValueCStr(format_val));
  if (!out_fmt || strcmp(out_fmt, "heic") == 0) rb_raise(eUnsupported, "unsupported output format");

  const char *input_path = StringValueCStr(input_val);
  double start = now_ms();

  /* Read the header through an explicit allowlisted loader. This validates the
   * input format (the loader fails on mismatched bytes) and lets us enforce the
   * pixel-count limit before any full decode happens. */
  const char *input_fmt = NULL;
  VipsImage *header = load_explicit(input_path, &input_fmt);
  long long pixels = 0, max_pixels = 0;
  if (pixels_exceed_limit(header, max_pixels_val, &pixels, &max_pixels)) {
    g_object_unref(header);
    raise_pixels_limit(pixels, max_pixels);
  }
  g_object_unref(header);

  /* Thumbnail straight from the file so libvips can shrink on load (e.g.
   * libjpeg DCT downscaling) instead of decoding the source at full
   * resolution. vips_thumbnail auto-rotates from the orientation tag by
   * default. ImageMagick loader classes are blocked globally in
   * init_vips_once, so this still cannot reach an ImageMagick delegate. */
  VipsImage *thumb = NULL;
  if (vips_thumbnail(input_path, &thumb, width,
      "height", height,
      "size", VIPS_SIZE_BOTH,
      "crop", VIPS_INTERESTING_CENTRE,
      "fail_on", VIPS_FAIL_ON_ERROR,
      NULL) != 0) {
    raise_vips();
  }

  if (save_explicit(thumb, StringValueCStr(output_val), out_fmt, quality) != 0) {
    g_object_unref(thumb);
    raise_vips();
  }

  int out_width = thumb->Xsize;
  int out_height = thumb->Ysize;
  double duration_ms = now_ms() - start;
  g_object_unref(thumb);

  VALUE hash = rb_hash_new();
  rb_hash_aset(hash, ID2SYM(rb_intern("input_format")), rb_str_new_cstr(input_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("output_format")), rb_str_new_cstr(out_fmt));
  rb_hash_aset(hash, ID2SYM(rb_intern("width")), INT2NUM(out_width));
  rb_hash_aset(hash, ID2SYM(rb_intern("height")), INT2NUM(out_height));
  rb_hash_aset(hash, ID2SYM(rb_intern("duration_ms")), DBL2NUM(duration_ms));
  return hash;
}