Revert of Pdfium: Fix fonts leaking on ClosePage. (patchset #10 id:180001 of https://codereview.chromium.org/2158023002/ )

Reason for revert:
Causes heap-use-after-free. See crbug.com/647612.

Original issue's description:
> Fix memory leaking on ClosePage.
> CFX_FontCache refactoring:
>   after this CL: Only one global CFX_FontCache used. Any cached items from it, are released, when its are not used.
>
> BUG=79367,48791
>
> The fonts was not cleared after unloading pages.
>
> Test pdf:
>
> http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf
>
> For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
> In this PDF we have 670 pages, as result after slow scrolling(reading) full document we have ~600 Mb fonts data in memory.
>
> memory usage of PDF Plugin:
>   before this CL: ~660 Mb
>   after this CL: ~100 Mb
>
> Committed: https://pdfium.googlesource.com/pdfium/+/cde5101eb15b24519e89fa500fe37038bc8e2201

TBR=tsepez@chromium.org,brucedawson@chromium.org,npm@chromium.org,art-snake@yandex-team.ru
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=79367,48791

Review-Url: https://codereview.chromium.org/2350763002

1 files changed, 19 insertions, 8 deletions

diff --git a/core/fxge/skia/fx_skia_device.cpp b/core/fxge/skia/fx_skia_device.cpp
index b1c47bfedf..d2e4abce92 100644
--- a/core/fxge/skia/fx_skia_device.cpp
+++ b/core/fxge/skia/fx_skia_device.cpp
@@ -14,6 +14,7 @@
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
+#include "core/fxge/include/cfx_fontcache.h"
 #include "core/fxge/include/cfx_fxgedevice.h"
 #include "core/fxge/include/cfx_gemodule.h"
 #include "core/fxge/include/cfx_graphstatedata.h"
@@ -485,6 +486,7 @@ class SkiaState {
   // mark all cached state as uninitialized
   SkiaState()
       : m_pFont(nullptr),
+        m_pCache(nullptr),
         m_fontSize(0),
         m_fillColor(0),
         m_strokeColor(0),
@@ -578,6 +580,7 @@ class SkiaState {
   bool DrawText(int nChars,
                 const FXTEXT_CHARPOS* pCharPos,
                 CFX_Font* pFont,
+                CFX_FontCache* pCache,
                 const CFX_Matrix* pMatrix,
                 FX_FLOAT font_size,
                 uint32_t color,
@@ -588,12 +591,13 @@ class SkiaState {
       FlushCommands(pDriver);
     if (m_drawPath)
       FlushPath(pDriver);
-    if (m_drawText && FontChanged(pFont, pMatrix, font_size, color))
+    if (m_drawText && FontChanged(pFont, pCache, pMatrix, font_size, color))
       FlushText(pDriver);
     if (!m_drawText) {
       m_positions.setCount(0);
       m_glyphs.setCount(0);
       m_pFont = pFont;
+      m_pCache = pCache;
       m_fontSize = font_size;
       m_fillColor = color;
       m_drawMatrix = *pMatrix;
@@ -622,8 +626,8 @@ class SkiaState {
     SkPaint skPaint;
     skPaint.setAntiAlias(true);
     skPaint.setColor(m_fillColor);
-    if (m_pFont->GetFace()) {  // exclude placeholder test fonts
-      sk_sp<SkTypeface> typeface(SkSafeRef(m_pFont->GetDeviceCache()));
+    if (m_pFont->GetFace() && m_pCache) {  // exclude placeholder test fonts
+      sk_sp<SkTypeface> typeface(SkSafeRef(m_pCache->GetDeviceCache(m_pFont)));
       skPaint.setTypeface(typeface);
     }
     skPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
@@ -779,11 +783,13 @@ class SkiaState {
   }
 
   bool FontChanged(CFX_Font* pFont,
+                   CFX_FontCache* pCache,
                    const CFX_Matrix* pMatrix,
                    FX_FLOAT font_size,
                    uint32_t color) {
-    return pFont != m_pFont || MatrixChanged(pMatrix, m_drawMatrix) ||
-           font_size != m_fontSize || color != m_fillColor;
+    return pFont != m_pFont || pCache != m_pCache ||
+           MatrixChanged(pMatrix, m_drawMatrix) || font_size != m_fontSize ||
+           color != m_fillColor;
   }
 
   bool MatrixChanged(const CFX_Matrix* pMatrix, const CFX_Matrix& refMatrix) {
@@ -866,6 +872,7 @@ class SkiaState {
   CFX_GraphStateData m_drawState;
   CFX_Matrix m_clipMatrix;
   CFX_Font* m_pFont;
+  CFX_FontCache* m_pCache;
   FX_FLOAT m_fontSize;
   uint32_t m_fillColor;
   uint32_t m_strokeColor;
@@ -998,14 +1005,18 @@ void CFX_SkiaDeviceDriver::Flush() {
 FX_BOOL CFX_SkiaDeviceDriver::DrawDeviceText(int nChars,
                                              const FXTEXT_CHARPOS* pCharPos,
                                              CFX_Font* pFont,
+                                             CFX_FontCache* pCache,
                                              const CFX_Matrix* pObject2Device,
                                              FX_FLOAT font_size,
                                              uint32_t color) {
-  if (m_pCache->DrawText(nChars, pCharPos, pFont, pObject2Device, font_size,
-                         color, this)) {
+  if (!pCache)
+    pCache = CFX_GEModule::Get()->GetFontCache();
+  if (m_pCache->DrawText(nChars, pCharPos, pFont, pCache, pObject2Device,
+                         font_size, color, this)) {
     return TRUE;
   }
-  sk_sp<SkTypeface> typeface(SkSafeRef(pFont->GetDeviceCache()));
+  sk_sp<SkTypeface> typeface(
+      SkSafeRef(pCache ? pCache->GetDeviceCache(pFont) : nullptr));
   SkPaint paint;
   paint.setAntiAlias(true);
   paint.setColor(color);