pdf: write only ToUnicode mappings needed by the font, trimming anything out of [firstChar, lastCha…

tests/ToUnicode.cpp

 
 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "Test.h"
 #include "SkData.h"
 #include "SkPDFTypes.h"
 #include "SkPDFFont.h"
 #include "SkStream.h"
 
 static bool stream_equals(const SkDynamicMemoryWStream& stream, size_t offset,
                           const char* buffer, size_t len) {
     SkAutoDataUnref data(stream.copyToData());
     if (offset + len > data->size()) {
         return false;
     }
     if (len != strlen(buffer)) {
         return false;
     }
     return memcmp(data->bytes() + offset, buffer, len) == 0;
 }
 
 void append_cmap_sections(const SkTDArray<SkUnichar>& glyphToUnicode,
                           const SkPDFGlyphSet* subset,
-                          SkDynamicMemoryWStream* cmap);
+                          SkDynamicMemoryWStream* cmap,
+                          uint16_t firstGlypthID,
+                          uint16_t lastGlypthID);
 
 static void TestToUnicode(skiatest::Reporter* reporter) {
     SkTDArray<SkUnichar> glyphToUnicode;
     SkTDArray<uint16_t> glyphsInSubset;
     SkPDFGlyphSet subset;
 
     glyphToUnicode.push(0);  // 0
     glyphToUnicode.push(0);  // 1
     glyphToUnicode.push(0);  // 2
     glyphsInSubset.push(3);
@@ skipping 22 matching lines @@
     glyphToUnicode.push(0x1010);
     glyphsInSubset.push(0xFF);
     glyphToUnicode.push(0x1011);
     glyphsInSubset.push(0x100);
     glyphToUnicode.push(0x1012);
     glyphsInSubset.push(0x101);
     glyphToUnicode.push(0x1013);
 
     SkDynamicMemoryWStream buffer;
     subset.set(glyphsInSubset.begin(), glyphsInSubset.count());
-    append_cmap_sections(glyphToUnicode, &subset, &buffer);
+    append_cmap_sections(glyphToUnicode, &subset, &buffer, 0, 0xFFFF);
 
     char expectedResult[] =
 "4 beginbfchar\n\
 <0003> <0020>\n\
 <0004> <0025>\n\
 <0008> <002F>\n\
 <0009> <0033>\n\
 endbfchar\n\
 4 beginbfrange\n\
 <0005> <0007> <0027>\n\
 <000B> <000C> <0035>\n\
 <00FE> <00FF> <1010>\n\
 <0100> <0101> <1012>\n\
 endbfrange\n";
 
     REPORTER_ASSERT(reporter, stream_equals(buffer, 0, expectedResult,
                                             buffer.getOffset()));
 
+    // Remove characters and ranges.
+    buffer.reset();
+
+    append_cmap_sections(glyphToUnicode, &subset, &buffer, 8, 0x00FF);
+
+    char expectedResultChop1[] =
+"2 beginbfchar\n\
+<0008> <002F>\n\
+<0009> <0033>\n\
+endbfchar\n\
+2 beginbfrange\n\
+<000B> <000C> <0035>\n\
+<00FE> <00FF> <1010>\n\
+endbfrange\n";
+
+    REPORTER_ASSERT(reporter, stream_equals(buffer, 0, expectedResultChop1,
+                                            buffer.getOffset()));
+
+    // Remove characters from range to downdrade it to one char.
+    buffer.reset();
+
+    append_cmap_sections(glyphToUnicode, &subset, &buffer, 0x00C, 0x00FE);
+
+    char expectedResultChop2[] =
+"2 beginbfchar\n\
+<000C> <0035>\n\
+<00FE> <1010>\n\
+endbfchar\n";
+
+    REPORTER_ASSERT(reporter, stream_equals(buffer, 0, expectedResultChop2,
+                                            buffer.getOffset()));
+
     glyphToUnicode.reset();
     glyphsInSubset.reset();
     SkPDFGlyphSet subset2;
 
     // Test mapping:
     //           I  n  s  t  a  l
     // Glyph id 2c 51 56 57 44 4f
     // Unicode  49 6e 73 74 61 6c
     for (size_t i = 0; i < 100; ++i) {
       glyphToUnicode.push(i + 29);
     }
 
     glyphsInSubset.push(0x2C);
     glyphsInSubset.push(0x44);
     glyphsInSubset.push(0x4F);
     glyphsInSubset.push(0x51);
     glyphsInSubset.push(0x56);
     glyphsInSubset.push(0x57);
 
     SkDynamicMemoryWStream buffer2;
     subset2.set(glyphsInSubset.begin(), glyphsInSubset.count());
-    append_cmap_sections(glyphToUnicode, &subset2, &buffer2);
+    append_cmap_sections(glyphToUnicode, &subset2, &buffer2, 0, 0xffff);
 
     char expectedResult2[] =
 "4 beginbfchar\n\
 <002C> <0049>\n\
 <0044> <0061>\n\
 <004F> <006C>\n\
 <0051> <006E>\n\
 endbfchar\n\
 1 beginbfrange\n\
 <0056> <0057> <0073>\n\
 endbfrange\n";
 
     REPORTER_ASSERT(reporter, stream_equals(buffer2, 0, expectedResult2,
                                             buffer2.getOffset()));
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("ToUnicode", ToUnicodeTestClass, TestToUnicode)