Add libpoppler PDF rasterizer

src/utils/SkPDFRasterizer.cpp

+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifdef SK_BUILD_FOR_WIN32
+        #pragma warning(push)
+        #pragma warning(disable : 4530)
+#endif

[ducky, 2013/08/01 20:40:23]

I have no clue what I'm doing here, but I saw this as a fix to a similar problem
elsewhere in the Skia codebase. Something about exceptions...

[vandebo (ex-Chrome), 2013/08/02 15:48:55]

What code is using exceptions?

[ducky, 2013/08/02 22:32:50]

I think it's something internal to poppler. The MSVC warning wasn't helpful at
all, telling me there was an error in one of the MSVC headers, so it's very hard
to pinpoint the bug. This seems to work, and seems to be part of gmmain as
well...

[vandebo (ex-Chrome), 2013/08/05 17:46:30]

You should look at the code to understand how exceptions are used.  It might be
important to the functionality.

[ducky, 2013/08/05 20:43:48]

The error message is super-unintuitive, but it looks like it might be because
poppler uses STL, and STL throws exceptions.

+
+#include <poppler-document.h>
+#include <poppler-image.h>
+#include <poppler-page.h>
+#include <poppler-page-renderer.h>
+
+#include "SkPDFRasterizer.h"
+#include "SkColorPriv.h"
+
+bool SkPopplerRasterizePDF(SkStream* pdf, SkBitmap* output) {
+  size_t size = pdf->getLength();
+  void* buffer = sk_malloc_throw(size);
+  pdf->read(buffer, size);
+
+  SkAutoTDelete<poppler::document> doc(
+      poppler::document::load_from_raw_data((const char*)buffer, size));
+  if (!doc.get() || doc->is_locked()) {
+    return false;
+  }
+
+  SkAutoTDelete<poppler::page> page(doc->create_page(0));
+  poppler::page_renderer renderer;
+  poppler::image image = renderer.render_page(page.get());
+
+  if (!image.is_valid() || image.format() != poppler::image::format_argb32) {
+    return false;
+  }
+
+  size_t width = image.width(), height = image.height();
+  size_t rowSize = image.bytes_per_row();
+  char *imgData = image.data();
+
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+  bitmap.allocPixels();
+  bitmap.eraseColor(SK_ColorWHITE);
+  SkPMColor* bitmapPixels = (SkPMColor*)bitmap.getPixels();
+
+  // do pixel-by-pixel copy to deal with RGBA ordering conversions
+  for (size_t y = 0; y < height; y++) {
+    char *rowData = imgData;
+    for (size_t x = 0; x < width; x++) {
+      U8CPU r = (unsigned char)rowData[2];
+      U8CPU g = (unsigned char)rowData[1];
+      U8CPU b = (unsigned char)rowData[0];
+
+      SkPMColor out = SkPackARGB32(
+          255, r, g, b);
+
+      *bitmapPixels = out;
+
+      bitmapPixels++;
+      rowData += 4;
+    }
+    imgData += rowSize;
+  }
+
+  output->swap(bitmap);
+
+  return true;
+}