Revert "Fix a problem that JP2 image is not displayed because index color space is used"

This reverts commit 5a0e504d53195892458d819e52c62bea0c710bd5.

Original review URL https://codereview.chromium.org/1009513003

Reason for revert: New "corpus" tests show that this is no longer rendering some images.  See, e.g. http://chromegw/i/client.pdfium/builders/linux/builds/144/steps/corpus%20tests/logs/stdio for those that diff'd.

TBR=jun_fang@foxitsoftware.com

Review URL: https://codereview.chromium.org/1016823003

2 files changed, 13 insertions, 26 deletions

diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
index 90895cd966..86db177ad7 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
@@ -7,7 +7,6 @@
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fxcodec/fx_codec.h"
-#include "../../fxcrt/fx_safe_types.h"
 #include "pageint.h"
 #include <limits.h>
 void sRGB_to_AdobeCMYK(FX_FLOAT R, FX_FLOAT G, FX_FLOAT B, FX_FLOAT& c, FX_FLOAT& m, FX_FLOAT& y, FX_FLOAT& k)
@@ -802,7 +801,6 @@ FX_BOOL CPDF_IndexedCS::v_Load(CPDF_Document* pDoc, CPDF_Array* pArray)
     }
     m_pCountedBaseCS = pDocPageData->FindColorSpacePtr(m_pBaseCS->GetArray());
     m_nBaseComponents = m_pBaseCS->CountComponents();
-    m_nComponents = m_nBaseComponents;
     m_pCompMinMax = FX_Alloc(FX_FLOAT, m_nBaseComponents * 2);
     FX_FLOAT defvalue;
     for (int i = 0; i < m_nBaseComponents; i ++) {
@@ -825,29 +823,22 @@ FX_BOOL CPDF_IndexedCS::v_Load(CPDF_Document* pDoc, CPDF_Array* pArray)
 }
 FX_BOOL CPDF_IndexedCS::GetRGB(FX_FLOAT* pBuf, FX_FLOAT& R, FX_FLOAT& G, FX_FLOAT& B) const
 {
-    int index = static_cast<FX_INT32>(*pBuf);
-    if (index < 0 || index > m_MaxIndex || m_nBaseComponents < 1) {
+    int index = (FX_INT32)(*pBuf);
+    if (index < 0 || index > m_MaxIndex) {
         return FALSE;
     }
-    FX_SAFE_INT32 colIndex = index;
-    colIndex *= m_nBaseComponents;
-    colIndex += m_nBaseComponents - 1; 
-    if (!colIndex.IsValid() || colIndex.ValueOrDie() >= m_Table.GetLength()) {
-        R = G = B = 0;
-        return FALSE;
+    if (m_nBaseComponents) {
+        if (index == INT_MAX || (index + 1) > INT_MAX / m_nBaseComponents ||
+                (index + 1)*m_nBaseComponents > (int)m_Table.GetLength()) {
+            R = G = B = 0;
+            return FALSE;
+        }
     }
-
     CFX_FixedBufGrow<FX_FLOAT, 16> Comps(m_nBaseComponents);
     FX_FLOAT* comps = Comps;
-    if (m_pBaseCS->sRGB()) {
-        for (int i = 0; i < m_nBaseComponents; i ++) {
-            comps[i] = pBuf[i] / 255;
-        }
-    } else {
-        FX_LPCBYTE pTable = m_Table;
-        for (int i = 0; i < m_nBaseComponents; i ++) {
-            comps[i] = m_pCompMinMax[i * 2] + m_pCompMinMax[i * 2 + 1] * pTable[index * m_nBaseComponents + i] / 255;
-        }
+    FX_LPCBYTE pTable = m_Table;
+    for (int i = 0; i < m_nBaseComponents; i ++) {
+        comps[i] = m_pCompMinMax[i * 2] + m_pCompMinMax[i * 2 + 1] * pTable[index * m_nBaseComponents + i] / 255;
     }
     m_pBaseCS->GetRGB(comps, R, G, B);
     return TRUE;
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index 4ed17cdfe5..79d73518a1 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -505,14 +505,10 @@ DIB_COMP_DATA* CPDF_DIBSource::GetDecodeAndMaskArray(FX_BOOL& bDefaultDecode, FX
     }
     int max_data = (1 << m_bpc) - 1;
     CPDF_Array* pDecode = m_pDict->GetArray(FX_BSTRC("Decode"));
-    FX_DWORD arrSize = pDecode ? pDecode->GetCount() : 0;
-    if (arrSize == 0) {
-        return NULL;
-    }
     if (pDecode) {
         for (FX_DWORD i = 0; i < m_nComponents; i ++) {
-            pCompData[i].m_DecodeMin = pDecode->GetNumber((i * 2) % arrSize);
-            FX_FLOAT max = pDecode->GetNumber((i * 2 + 1) % arrSize);
+            pCompData[i].m_DecodeMin = pDecode->GetNumber(i * 2);
+            FX_FLOAT max = pDecode->GetNumber(i * 2 + 1);
             pCompData[i].m_DecodeStep = (max - pCompData[i].m_DecodeMin) / max_data;
             FX_FLOAT def_value, def_min, def_max;
             m_pColorSpace->GetDefaultValue(i, def_value, def_min, def_max);