Move export snapshot target support to app core

src/app_core/document_export.h

@@ -424,6 +424,71 @@ public:
     return "Document export failed";
 }
 
+[[nodiscard]] constexpr bool ascii_iequals(std::string_view left, std::string_view right) noexcept
+{
+    if (left.size() != right.size()) {
+        return false;
+    }
+
+    for (std::size_t i = 0; i < left.size(); ++i) {
+        auto lhs = left[i];
+        if (lhs >= 'A' && lhs <= 'Z') {
+            lhs = static_cast<char>(lhs - 'A' + 'a');
+        }
+        auto rhs = right[i];
+        if (rhs >= 'A' && rhs <= 'Z') {
+            rhs = static_cast<char>(rhs - 'A' + 'a');
+        }
+        if (lhs != rhs) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+[[nodiscard]] constexpr bool document_export_path_has_extension(
+    std::string_view path,
+    std::string_view extension) noexcept
+{
+    return path.size() >= extension.size()
+        && ascii_iequals(path.substr(path.size() - extension.size()), extension);
+}
+
+[[nodiscard]] constexpr bool document_export_path_is_png_target(std::string_view path) noexcept
+{
+    return document_export_path_has_extension(path, ".png");
+}
+
+[[nodiscard]] constexpr bool document_export_path_is_jpeg_target(std::string_view path) noexcept
+{
+    return document_export_path_has_extension(path, ".jpg")
+        || document_export_path_has_extension(path, ".jpeg");
+}
+
+[[nodiscard]] constexpr bool document_export_snapshot_target_supported(
+    DocumentExportExecutionKind kind,
+    std::string_view target_path = {}) noexcept
+{
+    switch (kind) {
+    case DocumentExportExecutionKind::equirectangular_file:
+        return document_export_path_is_png_target(target_path)
+            || document_export_path_is_jpeg_target(target_path);
+    case DocumentExportExecutionKind::layers_collection:
+    case DocumentExportExecutionKind::layers_stem:
+    case DocumentExportExecutionKind::animation_frames_collection:
+    case DocumentExportExecutionKind::animation_frames_stem:
+    case DocumentExportExecutionKind::cube_faces:
+        return true;
+    case DocumentExportExecutionKind::depth:
+    case DocumentExportExecutionKind::animation_mp4:
+    case DocumentExportExecutionKind::timelapse:
+        return false;
+    }
+
+    return false;
+}
+
 [[nodiscard]] constexpr DocumentExportSnapshotRoutePlan plan_document_export_snapshot_route(
     DocumentExportExecutionKind kind,
     DocumentCanvasSaveSnapshotReport report,
@@ -456,6 +521,19 @@ public:
     return plan;
 }
 
+[[nodiscard]] constexpr DocumentExportSnapshotRoutePlan plan_document_export_snapshot_route_for_target(
+    DocumentExportExecutionKind kind,
+    DocumentCanvasSaveSnapshotReport report,
+    std::string_view target_path,
+    bool platform_supported) noexcept
+{
+    return plan_document_export_snapshot_route(
+        kind,
+        report,
+        document_export_snapshot_target_supported(kind, target_path),
+        platform_supported);
+}
+
 [[nodiscard]] constexpr DocumentExportCollectionTargetPlan plan_document_export_collection_target(
     DocumentExportCollectionKind kind,
     bool use_work_directory_collection) noexcept