Revert of PDF: remove last use of SkPDFImage (patchset #5 id:120001 of https://codereview.chromium.org/950633003/)

Reason for revert:
static void draw(SkCanvas* canvas,
                 const SkPaint& p,
                 const SkBitmap& src,
                 SkColorType colorType,
                 const char text[]) {
    SkASSERT(src.colorType() == colorType);
    canvas->drawBitmap(src, 0.0f, 0.0f);
    canvas->drawText(text, strlen(text), 0.0f, 12.0f, p);
}

This assert is firing, at least on macs, where all images get decoded into 32bit at the moment.

Original issue's description:
> PDF: remove last use of SkPDFImage
>
> Add a GM.
>
> BUG=skia:255
>
> Committed: https://skia.googlesource.com/skia/+/86ad8d643624a55b02e529100bbe4e2940115fa1

TBR=mtklein@google.com,halcanary@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:255

Review URL: https://codereview.chromium.org/1024113002

1 files changed, 91 insertions, 0 deletions

diff --git a/src/pdf/SkPDFImage.h b/src/pdf/SkPDFImage.h
new file mode 100644
index 0000000000..64be971bfc
--- /dev/null
+++ b/src/pdf/SkPDFImage.h
@@ -0,0 +1,91 @@
+
+/*
+ * Copyright 2010 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkPDFImage_DEFINED
+#define SkPDFImage_DEFINED
+
+#include "SkPicture.h"
+#include "SkPDFDevice.h"
+#include "SkPDFStream.h"
+#include "SkPDFTypes.h"
+#include "SkRefCnt.h"
+
+class SkBitmap;
+class SkData;
+class SkPDFCatalog;
+struct SkIRect;
+
+/**
+ *  Return the mose efficient availible encoding of the given bitmap.
+ */
+SkPDFObject* SkPDFCreateImageObject(SkPDFCanon* canon,
+                                    const SkBitmap&,
+                                    const SkIRect& subset);
+
+/** \class SkPDFImage
+
+    An image XObject.
+*/
+
+// We could play the same trick here as is done in SkPDFGraphicState, storing
+// a copy of the Bitmap object (not the pixels), the pixel generation number,
+// and settings used from the paint to canonicalize image objects.
+class SkPDFImage : public SkPDFStream {
+public:
+    /** Create a new Image XObject to represent the passed bitmap.
+     *  @param bitmap   The image to encode.
+     *  @param srcRect  The rectangle to cut out of bitmap.
+     *  @param paint    Used to calculate alpha, masks, etc.
+     *  @return  The image XObject or NUll if there is nothing to draw for
+     *           the given parameters.
+     */
+    static SkPDFImage* CreateImage(const SkBitmap& bitmap,
+                                   const SkIRect& srcRect);
+
+    virtual ~SkPDFImage();
+
+    bool isEmpty() {
+        return fSrcRect.isEmpty();
+    }
+
+private:
+    SkBitmap fBitmap;
+    bool fIsAlpha;
+    SkIRect fSrcRect;
+    bool fStreamValid;
+
+    /** Create a PDF image XObject. Entries for the image properties are
+     *  automatically added to the stream dictionary.
+     *  @param stream     The image stream. May be NULL. Otherwise, this
+     *                    (instead of the input bitmap) will be used as the
+     *                    PDF's content stream, possibly with lossless encoding.
+     *                    Will be duplicated, and left in indeterminate state.
+     *  @param bitmap     The image. If a stream is not given, its color data
+     *                    will be used as the image. If a stream is given, this
+     *                    is used for configuration only.
+     *  @param isAlpha    Whether or not this is the alpha of an image.
+     *  @param srcRect    The clipping applied to bitmap before generating
+     *                    imageData.
+     */
+    SkPDFImage(SkStream* stream, const SkBitmap& bitmap, bool isAlpha,
+               const SkIRect& srcRect);
+
+    /** Copy constructor, used to generate substitutes.
+     *  @param image      The SkPDFImage to copy.
+     */
+    SkPDFImage(SkPDFImage& pdfImage);
+
+    // Populate the stream dictionary.  This method returns false if
+    // fSubstitute should be used.
+    virtual bool populate(SkPDFCatalog* catalog);
+
+    typedef SkPDFStream INHERITED;
+};
+
+#endif