1 files changed, 96 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/pdf/SkPDFResourceDict.cpp b/gfx/skia/skia/src/pdf/SkPDFResourceDict.cpp
new file mode 100644
index 0000000000..a4eeed3029
--- /dev/null
+++ b/gfx/skia/skia/src/pdf/SkPDFResourceDict.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "include/core/SkStream.h"
+#include "src/pdf/SkPDFResourceDict.h"
+#include "src/pdf/SkPDFTypes.h"
+
+// Verify that the values of enum ResourceType correspond to the expected values
+// as defined in the arrays below.
+// If these are failing, you may need to update the kResourceTypePrefixes
+// and kResourceTypeNames arrays below.
+static_assert(0 == (int)SkPDFResourceType::kExtGState, "resource_type_mismatch");
+static_assert(1 == (int)SkPDFResourceType::kPattern,   "resource_type_mismatch");
+static_assert(2 == (int)SkPDFResourceType::kXObject,   "resource_type_mismatch");
+static_assert(3 == (int)SkPDFResourceType::kFont,      "resource_type_mismatch");
+
+// One extra character for the Prefix.
+constexpr size_t kMaxResourceNameLength = 1 + kSkStrAppendS32_MaxSize;
+
+// returns pointer just past end of what's written into `dst`.
+static char* get_resource_name(char dst[kMaxResourceNameLength], SkPDFResourceType type, int key) {
+    static const char kResourceTypePrefixes[] = {
+        'G',  // kExtGState
+        'P',  // kPattern
+        'X',  // kXObject
+        'F'   // kFont
+    };
+    SkASSERT((unsigned)type < std::size(kResourceTypePrefixes));
+    dst[0] = kResourceTypePrefixes[(unsigned)type];
+    return SkStrAppendS32(dst + 1, key);
+}
+
+void SkPDFWriteResourceName(SkWStream* dst, SkPDFResourceType type, int key) {
+    // One extra character for the leading '/'.
+    char buffer[1 + kMaxResourceNameLength];
+    buffer[0] = '/';
+    char* end = get_resource_name(buffer + 1, type, key);
+    dst->write(buffer, (size_t)(end - buffer));
+}
+
+static const char* resource_name(SkPDFResourceType type) {
+    static const char* kResourceTypeNames[] = {
+        "ExtGState",
+        "Pattern",
+        "XObject",
+        "Font"
+    };
+    SkASSERT((unsigned)type < std::size(kResourceTypeNames));
+    return kResourceTypeNames[(unsigned)type];
+}
+
+static SkString resource(SkPDFResourceType type, int index) {
+    char buffer[kMaxResourceNameLength];
+    char* end = get_resource_name(buffer, type, index);
+    return SkString(buffer, (size_t)(end - buffer));
+}
+
+static void add_subdict(const std::vector<SkPDFIndirectReference>& resourceList,
+                        SkPDFResourceType type,
+                        SkPDFDict* dst) {
+    if (!resourceList.empty()) {
+        auto resources = SkPDFMakeDict();
+        for (SkPDFIndirectReference ref : resourceList) {
+            resources->insertRef(resource(type, ref.fValue), ref);
+        }
+        dst->insertObject(resource_name(type), std::move(resources));
+    }
+}
+
+static std::unique_ptr<SkPDFArray> make_proc_set() {
+    auto procSets = SkPDFMakeArray();
+    static const char kProcs[][7] = { "PDF", "Text", "ImageB", "ImageC", "ImageI"};
+    procSets->reserve(std::size(kProcs));
+    for (const char* proc : kProcs) {
+        procSets->appendName(proc);
+    }
+    return procSets;
+}
+
+std::unique_ptr<SkPDFDict> SkPDFMakeResourceDict(
+        const std::vector<SkPDFIndirectReference>& graphicStateResources,
+        const std::vector<SkPDFIndirectReference>& shaderResources,
+        const std::vector<SkPDFIndirectReference>& xObjectResources,
+        const std::vector<SkPDFIndirectReference>& fontResources) {
+    auto dict = SkPDFMakeDict();
+    dict->insertObject("ProcSet", make_proc_set());
+    add_subdict(graphicStateResources, SkPDFResourceType::kExtGState, dict.get());
+    add_subdict(shaderResources,       SkPDFResourceType::kPattern,   dict.get());
+    add_subdict(xObjectResources,      SkPDFResourceType::kXObject,   dict.get());
+    add_subdict(fontResources,         SkPDFResourceType::kFont,      dict.get());
+    return dict;
+}