Add pdfium::clamp() as a placeholder for std::clamp().chromium/3046

Ue it to fix a typo as well.

BUG=pdfium:634

Change-Id: I2d686242ffb841aedc2fae6a3cf7a00bea667404
Reviewed-on: https://pdfium-review.googlesource.com/3113
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

4 files changed, 25 insertions, 29 deletions

diff --git a/core/fpdfapi/page/cpdf_allstates.cpp b/core/fpdfapi/page/cpdf_allstates.cpp
index a30696e8b7..c67d3152c0 100644
--- a/core/fpdfapi/page/cpdf_allstates.cpp
+++ b/core/fpdfapi/page/cpdf_allstates.cpp
@@ -14,14 +14,7 @@
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fxge/cfx_graphstatedata.h"
-
-namespace {
-
-float ClipFloat(float f) {
-  return std::max(0.0f, std::min(1.0f, f));
-}
-
-}  // namespace
+#include "third_party/base/stl_util.h"
 
 CPDF_AllStates::CPDF_AllStates()
     : m_TextLeading(0), m_TextRise(0), m_TextHorzScale(1.0f) {}
@@ -117,10 +110,12 @@ void CPDF_AllStates::ProcessExtGS(CPDF_Dictionary* pGS,
         }
         break;
       case FXBSTR_ID('C', 'A', 0, 0):
-        m_GeneralState.SetStrokeAlpha(ClipFloat(pObject->GetNumber()));
+        m_GeneralState.SetStrokeAlpha(
+            pdfium::clamp(pObject->GetNumber(), 0.0f, 1.0f));
         break;
       case FXBSTR_ID('c', 'a', 0, 0):
-        m_GeneralState.SetFillAlpha(ClipFloat(pObject->GetNumber()));
+        m_GeneralState.SetFillAlpha(
+            pdfium::clamp(pObject->GetNumber(), 0.0f, 1.0f));
         break;
       case FXBSTR_ID('O', 'P', 0, 0):
         m_GeneralState.SetStrokeOP(!!pObject->GetInteger());
diff --git a/core/fpdfapi/page/cpdf_colorspace.cpp b/core/fpdfapi/page/cpdf_colorspace.cpp
index 1aaa1440a4..cc4afa55c9 100644
--- a/core/fpdfapi/page/cpdf_colorspace.cpp
+++ b/core/fpdfapi/page/cpdf_colorspace.cpp
@@ -24,6 +24,7 @@
 #include "core/fxcodec/fx_codec.h"
 #include "core/fxcrt/cfx_maybe_owned.h"
 #include "core/fxcrt/fx_memory.h"
+#include "third_party/base/stl_util.h"
 
 namespace {
 
@@ -227,7 +228,7 @@ class CPDF_DeviceNCS : public CPDF_ColorSpace {
 };
 
 float RGB_Conversion(float colorComponent) {
-  colorComponent = std::min(std::max(colorComponent, 0.0f), 1.0f);
+  colorComponent = pdfium::clamp(colorComponent, 0.0f, 1.0f);
   int scale = std::max(static_cast<int>(colorComponent * 1023), 0);
   if (scale < 192)
     return g_sRGBSamples1[scale] / 255.0f;
@@ -686,11 +687,12 @@ void CPDF_LabCS::GetDefaultValue(int iComponent,
     *min = 0.0f;
     *max = 100 * 1.0f;
     *value = 0.0f;
-  } else {
-    *min = m_Ranges[iComponent * 2 - 2];
-    *max = m_Ranges[iComponent * 2 - 1];
-    *value = std::min(std::max(0.0f, *min), *max);
+    return;
   }
+
+  *min = m_Ranges[iComponent * 2 - 2];
+  *max = m_Ranges[iComponent * 2 - 1];
+  *value = pdfium::clamp(0.0f, *min, *max);
 }
 
 bool CPDF_LabCS::v_Load(CPDF_Document* pDoc, CPDF_Array* pArray) {
diff --git a/core/fpdfapi/page/fpdf_page_colors.cpp b/core/fpdfapi/page/fpdf_page_colors.cpp
index e69620ea9a..adee5ff84b 100644
--- a/core/fpdfapi/page/fpdf_page_colors.cpp
+++ b/core/fpdfapi/page/fpdf_page_colors.cpp
@@ -18,11 +18,12 @@
 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
 #include "core/fpdfapi/parser/cpdf_string.h"
 #include "core/fxcodec/fx_codec.h"
+#include "third_party/base/stl_util.h"
 
 namespace {
 
 float NormalizeChannel(float fVal) {
-  return std::min(std::max(fVal, 0.0f), 1.0f);
+  return pdfium::clamp(fVal, 0.0f, 1.0f);
 }
 
 bool DetectSRGB(const uint8_t* pData, uint32_t dwSize) {
diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp
index 94695daca2..30f3b895d4 100644
--- a/core/fpdfapi/page/fpdf_page_func.cpp
+++ b/core/fpdfapi/page/fpdf_page_func.cpp
@@ -21,6 +21,7 @@
 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
 #include "core/fxcrt/fx_safe_types.h"
 #include "third_party/base/ptr_util.h"
+#include "third_party/base/stl_util.h"
 
 namespace {
 
@@ -541,8 +542,8 @@ bool CPDF_SampledFunc::v_Call(float* inputs, float* results) const {
     encoded_input[i] =
         PDF_Interpolate(inputs[i], m_pDomains[i * 2], m_pDomains[i * 2 + 1],
                         m_EncodeInfo[i].encode_min, m_EncodeInfo[i].encode_max);
-    index[i] = std::min((uint32_t)std::max(0.f, encoded_input[i]),
-                        m_EncodeInfo[i].sizes - 1);
+    index[i] = pdfium::clamp(static_cast<uint32_t>(encoded_input[i]), 0U,
+                             m_EncodeInfo[i].sizes - 1);
     pos += index[i] * blocksize[i];
   }
   FX_SAFE_INT32 bits_to_output = m_nOutputs;
@@ -816,19 +817,16 @@ bool CPDF_Function::Call(float* inputs,
 
   *nresults = m_nOutputs;
   for (uint32_t i = 0; i < m_nInputs; i++) {
-    if (inputs[i] < m_pDomains[i * 2])
-      inputs[i] = m_pDomains[i * 2];
-    else if (inputs[i] > m_pDomains[i * 2 + 1])
-      inputs[i] = m_pDomains[i * 2] + 1;
+    inputs[i] =
+        pdfium::clamp(inputs[i], m_pDomains[i * 2], m_pDomains[i * 2 + 1]);
   }
   v_Call(inputs, results);
-  if (m_pRanges) {
-    for (uint32_t i = 0; i < m_nOutputs; i++) {
-      if (results[i] < m_pRanges[i * 2])
-        results[i] = m_pRanges[i * 2];
-      else if (results[i] > m_pRanges[i * 2 + 1])
-        results[i] = m_pRanges[i * 2 + 1];
-    }
+  if (!m_pRanges)
+    return true;
+
+  for (uint32_t i = 0; i < m_nOutputs; i++) {
+    results[i] =
+        pdfium::clamp(results[i], m_pRanges[i * 2], m_pRanges[i * 2 + 1]);
   }
   return true;
 }