blob: 6a3562492b8358854c78331f0f3756d975c9f6f5 [file] [log] [blame]
/*
* 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"
// Sanity check 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 + SkStrAppendS32_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 < SK_ARRAY_COUNT(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 < SK_ARRAY_COUNT(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(SK_ARRAY_COUNT(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("ProcSets", 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;
}