Supply separate flags for onBuildTileIndex

src/images/SkJpegUtility.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 "SkJpegUtility.h"
 
+#if defined(SK_BUILD_FOR_ANDROID) && !defined(SK_JPEG_NO_INDEX_SUPPORTED)
+#define SK_JPEG_INDEX_SUPPORTED
+#endif
+
 /////////////////////////////////////////////////////////////////////
 static void sk_init_source(j_decompress_ptr cinfo) {
     skjpeg_source_mgr*  src = (skjpeg_source_mgr*)cinfo->src;
     src->next_input_byte = (const JOCTET*)src->fBuffer;
     src->bytes_in_buffer = 0;
-#ifdef SK_BUILD_FOR_ANDROID
+#ifdef SK_JPEG_INDEX_SUPPORTED
     src->current_offset = 0;
 #endif
     if (!src->fStream->rewind()) {
         SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
         cinfo->err->error_exit((j_common_ptr)cinfo);
     }
 }
 
-#ifdef SK_BUILD_FOR_ANDROID
+#ifdef SK_JPEG_INDEX_SUPPORTED
 static boolean sk_seek_input_data(j_decompress_ptr cinfo, long byte_offset) {
     skjpeg_source_mgr* src = (skjpeg_source_mgr*)cinfo->src;
     size_t bo = (size_t) byte_offset;
 
     if (bo > src->current_offset) {
         (void)src->fStream->skip(bo - src->current_offset);
     } else {
         if (!src->fStream->rewind()) {
             SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
             cinfo->err->error_exit((j_common_ptr)cinfo);
@@ skipping 14 matching lines @@
     if (src->fDecoder != nullptr && src->fDecoder->shouldCancelDecode()) {
         return FALSE;
     }
     size_t bytes = src->fStream->read(src->fBuffer, skjpeg_source_mgr::kBufferSize);
     // note that JPEG is happy with less than the full read,
     // as long as the result is non-zero
     if (bytes == 0) {
         return FALSE;
     }
 
-#ifdef SK_BUILD_FOR_ANDROID
+#ifdef SK_JPEG_INDEX_SUPPORTED
     src->current_offset += bytes;
 #endif
     src->next_input_byte = (const JOCTET*)src->fBuffer;
     src->bytes_in_buffer = bytes;
     return TRUE;
 }
 
 static void sk_skip_input_data(j_decompress_ptr cinfo, long num_bytes) {
     skjpeg_source_mgr*  src = (skjpeg_source_mgr*)cinfo->src;
 
     if (num_bytes > (long)src->bytes_in_buffer) {
         size_t bytesToSkip = num_bytes - src->bytes_in_buffer;
         while (bytesToSkip > 0) {
             size_t bytes = src->fStream->skip(bytesToSkip);
             if (bytes <= 0 || bytes > bytesToSkip) {
 //              SkDebugf("xxxxxxxxxxxxxx failure to skip request %d returned %d\n", bytesToSkip, bytes);
                 cinfo->err->error_exit((j_common_ptr)cinfo);
                 return;
             }
-#ifdef SK_BUILD_FOR_ANDROID
+#ifdef SK_JPEG_INDEX_SUPPORTED
             src->current_offset += bytes;
 #endif
             bytesToSkip -= bytes;
         }
         src->next_input_byte = (const JOCTET*)src->fBuffer;
         src->bytes_in_buffer = 0;
     } else {
         src->next_input_byte += num_bytes;
         src->bytes_in_buffer -= num_bytes;
     }
 }
 
 static void sk_term_source(j_decompress_ptr /*cinfo*/) {}
 
 
 ///////////////////////////////////////////////////////////////////////////////
 
 skjpeg_source_mgr::skjpeg_source_mgr(SkStream* stream, SkImageDecoder* decoder)
     : fStream(stream)
     , fDecoder(decoder) {
 
     init_source = sk_init_source;
     fill_input_buffer = sk_fill_input_buffer;
     skip_input_data = sk_skip_input_data;
     resync_to_restart = jpeg_resync_to_restart;
     term_source = sk_term_source;
-#ifdef SK_BUILD_FOR_ANDROID
+#ifdef SK_JPEG_INDEX_SUPPORTED
     seek_input_data = sk_seek_input_data;
 #endif
 //    SkDebugf("**************** use memorybase %p %d\n", fMemoryBase, fMemoryBaseSize);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static void sk_init_destination(j_compress_ptr cinfo) {
     skjpeg_destination_mgr* dest = (skjpeg_destination_mgr*)cinfo->dest;
 
@@ skipping 39 matching lines @@
 void skjpeg_error_exit(j_common_ptr cinfo) {
     skjpeg_error_mgr* error = (skjpeg_error_mgr*)cinfo->err;
 
     (*error->output_message) (cinfo);
 
     /* Let the memory manager delete any temp files before we die */
     jpeg_destroy(cinfo);
 
     longjmp(error->fJmpBuf, -1);
 }