Modernize codec usage in pdf/

Codec calls have new API that uses std::optional and spans. Switch usage
to those new APIs, and lightly modernize the calling code.

Bug: 370696612
Change-Id: Ic1c4effb2f426595f84fda1d0cad300989e33ecb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5932471
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1369531}

pdf/pdfium/pdfium_print.cc

@@ -440,21 +440,20 @@ ScopedFPDFDocument PDFiumPrint::CreateSinglePageRasterPdf(
       kBGRA_8888_SkColorType, kOpaque_SkAlphaType);
   SkPixmap src(info, FPDFBitmap_GetBuffer(bitmap.get()),
                FPDFBitmap_GetStride(bitmap.get()));
-  std::vector<uint8_t> compressed_bitmap_data;
-  bool encoded = gfx::JPEGCodec::Encode(src, kQuality, &compressed_bitmap_data);
-
+  std::optional<std::vector<uint8_t>> compressed_bitmap_data =
+      gfx::JPEGCodec::Encode(src, kQuality);
   ScopedFPDFPage temp_page_holder(
       FPDFPage_New(temp_doc.get(), 0, source_page_width, source_page_height));
   FPDF_PAGE temp_page = temp_page_holder.get();
-  if (encoded) {
-    base::span<const uint8_t> compressed_bitmap_span =
-        base::make_span(compressed_bitmap_data);
+  if (compressed_bitmap_data) {
+    base::span<const uint8_t> compressed_bitmap_span(
+        compressed_bitmap_data.value());
     FPDF_FILEACCESS file_access = {};
     file_access.m_FileLen =
-        static_cast<unsigned long>(compressed_bitmap_data.size());
+        static_cast<unsigned long>(compressed_bitmap_span.size());
     file_access.m_GetBlock = [](void* param, unsigned long pos,
                                 unsigned char* buf, unsigned long size) {
-      const auto& compressed_bitmap_span =
+      base::span<const uint8_t>& compressed_bitmap_span =
           *static_cast<base::span<const uint8_t>*>(param);
       if (pos + size < pos || pos + size > compressed_bitmap_span.size()) {
         return 0;
@@ -464,7 +463,7 @@ ScopedFPDFDocument PDFiumPrint::CreateSinglePageRasterPdf(
       buf_span.copy_from(compressed_bitmap_span.subspan(pos, size));
       return 1;
     };
-    file_access.m_Param = &compressed_bitmap_data;
+    file_access.m_Param = &compressed_bitmap_span;
 
     FPDFImageObj_LoadJpegFileInline(&temp_page, 1, temp_img.get(),
                                     &file_access);

pdf/pdfium/pdfium_progressive_searchifier.cc

@@ -45,18 +45,20 @@ void PdfiumProgressiveSearchifier::AddPage(
   CHECK(page);
   ScopedFPDFPageObject image(FPDFPageObj_NewImageObj(doc_.get()));
   CHECK(image);
-  std::vector<uint8_t> encoded;
-  CHECK(gfx::JPEGCodec::Encode(bitmap, 100, &encoded));
-  base::span<const uint8_t> encoded_span = base::make_span(encoded);
+  std::optional<std::vector<uint8_t>> encoded =
+      gfx::JPEGCodec::Encode(bitmap, /*quality=*/100);
+  CHECK(encoded.has_value());
+  base::span<const uint8_t> encoded_span(encoded.value());
   FPDF_FILEACCESS file_access = {};
   file_access.m_FileLen = static_cast<unsigned long>(encoded_span.size());
   file_access.m_GetBlock = [](void* param, unsigned long pos,
                               unsigned char* buf, unsigned long size) {
-    const auto& encoded_span = *static_cast<base::span<const uint8_t>*>(param);
+    base::span<const uint8_t>& encoded_span =
+        *static_cast<base::span<const uint8_t>*>(param);
     if (pos + size < pos || pos + size > encoded_span.size()) {
       return 0;
     }
-    // TODO(tsepez): spanify arguments to remove the error.
+    // TODO(thestig): spanify arguments to remove the error.
     base::span<uint8_t> UNSAFE_TODO(buf_span(buf, size));
     buf_span.copy_from(encoded_span.subspan(pos, size));
     return 1;