Add libpoppler PDF rasterizer

src/utils/SkPDFRasterizer.cpp

Index: src/utils/SkPDFRasterizer.cpp
diff --git a/src/utils/SkPDFRasterizer.cpp b/src/utils/SkPDFRasterizer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e0c951a56533fa7850d1710e14ac2f667a1cbfcd
--- /dev/null
+++ b/src/utils/SkPDFRasterizer.cpp
@@ -0,0 +1,75 @@
+
+/*
+ * 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)

[vandebo (ex-Chrome), 2013/08/14 15:41:37]

Don't indent these.

[ducky, 2013/08/14 20:43:18]

Done.

+	#pragma warning(disable : 4530)
+#endif
+
+#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);
+  if (!bitmap.allocPixels()) {
+      return false;
+  }
+  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);

[vandebo (ex-Chrome), 2013/08/14 15:41:37]

Are you dropping the alpha component?

[vandebo (ex-Chrome), 2013/08/14 15:41:37]

nit: line wrap.

[ducky, 2013/08/14 20:43:18]

Done.

[ducky, 2013/08/14 20:43:18]

Yes. I tried adding back in the alpha, but the pictures look quite off if I
don't.

[vandebo (ex-Chrome), 2013/08/15 00:22:13]

This concerns me.  Can you try using this with a pdf that has alpha and see what
the values look like.  It may be a premultiplication vs not issue.

[ducky, 2013/08/15 01:19:12]

Looks like I typo'd when unpacking my pixels...
SkDiff shows everything is unchanged now.

+
+      *bitmapPixels = out;
+
+      bitmapPixels++;
+      rowData += 4;
+    }
+    imgData += rowSize;
+  }
+
+  output->swap(bitmap);
+
+  return true;
+}