Revert "Remove CFX_FixedBufGrow"

This reverts commit 55d1d0191ea8316df32858d8cc62fb7c620e8613.

Reason for revert: Slowing down corpus tests by a lot on Mac/Win

Original change's description:
> Remove CFX_FixedBufGrow
> 
> This Cl replaces the CFX_FixedBufGrow class with std::vector.
> 
> Change-Id: I85c85b7a8de4794840b561e09841bb464cfa9dfe
> Reviewed-on: https://pdfium-review.googlesource.com/3138
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Commit-Queue: dsinclair <dsinclair@chromium.org>
> 

TBR=tsepez@chromium.org,dsinclair@chromium.org,pdfium-reviews@googlegroups.com
# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Iaee27570f140b2033b5d8fb8f3077fc839558d64
Reviewed-on: https://pdfium-review.googlesource.com/3158
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp
index b12b2863fe..30f3b895d4 100644
--- a/core/fpdfapi/page/fpdf_page_func.cpp
+++ b/core/fpdfapi/page/fpdf_page_func.cpp
@@ -529,9 +529,11 @@ bool CPDF_SampledFunc::v_Init(CPDF_Object* pObj) {
 
 bool CPDF_SampledFunc::v_Call(float* inputs, float* results) const {
   int pos = 0;
-  std::vector<float> encoded_input(std::max(16U, m_nInputs));
-  std::vector<uint32_t> index(std::max(32U, m_nInputs * 2));
-  uint32_t* blocksize = index.data() + m_nInputs;
+  CFX_FixedBufGrow<float, 16> encoded_input_buf(m_nInputs);
+  float* encoded_input = encoded_input_buf;
+  CFX_FixedBufGrow<uint32_t, 32> int_buf(m_nInputs * 2);
+  uint32_t* index = int_buf;
+  uint32_t* blocksize = index + m_nInputs;
   for (uint32_t i = 0; i < m_nInputs; i++) {
     if (i == 0)
       blocksize[i] = 1;