Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/third_party/jpeg-xl/lib/extras/alpha_blend.cc b/third_party/jpeg-xl/lib/extras/alpha_blend.cc
new file mode 100644
index 0000000000..50c141c6fb
--- /dev/null
+++ b/third_party/jpeg-xl/lib/extras/alpha_blend.cc
@@ -0,0 +1,63 @@
+// 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/extras/alpha_blend.h"
+
+#include "lib/extras/packed_image.h"
+
+namespace jxl {
+namespace extras {
+
+namespace {
+
+void AlphaBlend(PackedFrame* frame, float background[3]) {
+  if (!frame) return;
+  const PackedImage& im = frame->color;
+  JxlPixelFormat format = im.format;
+  if (format.num_channels != 2 && format.num_channels != 4) {
+    return;
+  }
+  --format.num_channels;
+  PackedImage blended(im.xsize, im.ysize, format);
+  // TODO(szabadka) SIMDify this and make it work for float16.
+  for (size_t y = 0; y < im.ysize; ++y) {
+    for (size_t x = 0; x < im.xsize; ++x) {
+      if (format.num_channels == 2) {
+        float g = im.GetPixelValue(y, x, 0);
+        float a = im.GetPixelValue(y, x, 1);
+        float out = g * a + background[0] * (1 - a);
+        blended.SetPixelValue(y, x, 0, out);
+      } else {
+        float r = im.GetPixelValue(y, x, 0);
+        float g = im.GetPixelValue(y, x, 1);
+        float b = im.GetPixelValue(y, x, 2);
+        float a = im.GetPixelValue(y, x, 3);
+        float out_r = r * a + background[0] * (1 - a);
+        float out_g = g * a + background[1] * (1 - a);
+        float out_b = b * a + background[2] * (1 - a);
+        blended.SetPixelValue(y, x, 0, out_r);
+        blended.SetPixelValue(y, x, 1, out_g);
+        blended.SetPixelValue(y, x, 2, out_b);
+      }
+    }
+  }
+  frame->color = blended.Copy();
+}
+
+}  // namespace
+
+void AlphaBlend(PackedPixelFile* ppf, float background[3]) {
+  if (!ppf || ppf->info.alpha_bits == 0) {
+    return;
+  }
+  ppf->info.alpha_bits = 0;
+  AlphaBlend(ppf->preview_frame.get(), background);
+  for (auto& frame : ppf->frames) {
+    AlphaBlend(&frame, background);
+  }
+}
+
+}  // namespace extras
+}  // namespace jxl