1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/modular/transform/enc_transform.cc b/third_party/jpeg-xl/lib/jxl/modular/transform/enc_transform.cc
new file mode 100644
index 0000000000..bdaaf9f87e
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/modular/transform/enc_transform.cc
@@ -0,0 +1,46 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/modular/transform/enc_transform.h"
+
+#include "lib/jxl/modular/transform/enc_palette.h"
+#include "lib/jxl/modular/transform/enc_rct.h"
+#include "lib/jxl/modular/transform/enc_squeeze.h"
+
+namespace jxl {
+
+Status TransformForward(Transform &t, Image &input,
+                        const weighted::Header &wp_header, ThreadPool *pool) {
+  switch (t.id) {
+    case TransformId::kRCT:
+      return FwdRCT(input, t.begin_c, t.rct_type, pool);
+    case TransformId::kSqueeze:
+      return FwdSqueeze(input, t.squeezes, pool);
+    case TransformId::kPalette:
+      return FwdPalette(input, t.begin_c, t.begin_c + t.num_c - 1, t.nb_colors,
+                        t.nb_deltas, t.ordered_palette, t.lossy_palette,
+                        t.predictor, wp_header);
+    default:
+      return JXL_FAILURE("Unknown transformation (ID=%u)",
+                         static_cast<unsigned int>(t.id));
+  }
+}
+
+void compute_minmax(const Channel &ch, pixel_type *min, pixel_type *max) {
+  pixel_type realmin = std::numeric_limits<pixel_type>::max();
+  pixel_type realmax = std::numeric_limits<pixel_type>::min();
+  for (size_t y = 0; y < ch.h; y++) {
+    const pixel_type *JXL_RESTRICT p = ch.Row(y);
+    for (size_t x = 0; x < ch.w; x++) {
+      if (p[x] < realmin) realmin = p[x];
+      if (p[x] > realmax) realmax = p[x];
+    }
+  }
+
+  if (min) *min = realmin;
+  if (max) *max = realmax;
+}
+
+}  // namespace jxl