Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/scene/image_loader.h

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+/* SPDX-FileCopyrightText: 2011-2026 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include <atomic>
+
+#include "util/param.h"
+#include "util/string.h"
+#include "util/types_image.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Progress;
+class ImageMetaData;
+
+/* Parameters for image loading. */
+struct ImageLoaderParams {
+  bool use_texture_cache = true;
+  bool auto_texture_cache = true;
+  string texture_cache_path;
+  ustring colorspace;
+  ImageAlphaType alpha_type;
+
+  /* Error reporting. */
+  std::atomic<int> &load_failure_num;
+  std::atomic<int> &tx_failure_num;
+};
+
+/* Image loader base class, that can be subclassed to load image data
+ * from custom sources (file, memory, procedurally generated, etc). */
+class ImageLoader {
+ public:
+  ImageLoader();
+  virtual ~ImageLoader() = default;
+
+  /* Load metadata without actual image yet, should be fast. */
+  virtual bool load_metadata(ImageMetaData &metadata,
+                             const ImageLoaderParams &params,
+                             Progress &progress) = 0;
+
+  /* Load full image pixels.
+   * This is expected to call metadata.conform_pixels(). */
+  virtual bool load_pixels(const ImageMetaData &metadata, void *pixels) = 0;
+
+  /* Load pixels for a single tile, if ImageMetaData.tile_size is set.
+   * This is expected to call metadata.conform_pixels(). */
+  virtual bool load_pixels_tile(const ImageMetaData & /*metadata*/,
+                                const int /*miplevel*/,
+                                const int64_t /*x*/,
+                                const int64_t /*y*/,
+                                const int64_t /*w*/,
+                                const int64_t /*h*/,
+                                const int64_t /*x_stride*/,
+                                const int64_t /*y_stride*/,
+                                const int64_t /*padding*/,
+                                const ExtensionType /*extension*/,
+                                uint8_t * /*pixels*/)
+  {
+    return false;
+  }
+
+  /* Name for logs and stats. */
+  virtual string name() const = 0;
+
+  /* Optional for tiled textures loaded externally. */
+  virtual int get_tile_number() const;
+
+  /* Free any memory used for loading metadata and pixels. */
+  virtual void cleanup() {};
+
+  /* Compare avoid loading the same image multiple times. */
+  virtual bool equals(const ImageLoader &other) const = 0;
+  static bool equals(const ImageLoader *a, const ImageLoader *b);
+
+  /* Test if this loader will load NanoVDB. */
+  virtual bool is_vdb_loader() const;
+};
+
+CCL_NAMESPACE_END