SkPDF: Add SkPDFCanvas to intercept some draw calls

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotationKeys.h"
@@ skipping 1020 matching lines @@
     SkPDFUtils::PaintPath(paint.getStyle(), pathPtr->getFillType(),
                           &content.entry()->fContent);
 }
 
 void SkPDFDevice::drawBitmapRect(const SkDraw& draw,
                                  const SkBitmap& bitmap,
                                  const SkRect* src,
                                  const SkRect& dst,
                                  const SkPaint& srcPaint,
                                  SkCanvas::SrcRectConstraint constraint) {
-    const SkImage* image = fCanon->bitmapToImage(bitmap);
-    if (!image) {
-        return;
-    }
-    // ownership of this image is retained by the canon.
-    this->drawImageRect(draw, image, src, dst, srcPaint, constraint);
+    SkASSERT(false);
 }
 
 void SkPDFDevice::drawBitmap(const SkDraw& d,
                              const SkBitmap& bitmap,
                              const SkMatrix& matrix,
                              const SkPaint& srcPaint) {
     SkPaint paint = srcPaint;
     if (bitmap.isOpaque()) {
         replace_srcmode_on_opaque_paint(&paint);
     }
@@ skipping 56 matching lines @@
     this->internalDrawImage(transform, draw.fClipStack, *draw.fClip, image,
                             nullptr, paint);
 }
 
 void SkPDFDevice::drawImageRect(const SkDraw& draw,
                                 const SkImage* image,
                                 const SkRect* src,
                                 const SkRect& dst,
                                 const SkPaint& srcPaint,
                                 SkCanvas::SrcRectConstraint constraint) {
-    if (!image) {
-        return;
-    }
-    if (draw.fClip->isEmpty()) {
-        return;
-    }
-    SkPaint paint = srcPaint;
-    if (image->isOpaque()) {
-        replace_srcmode_on_opaque_paint(&paint);
-    }
-    // TODO: this code path must be updated to respect the flags parameter
-    SkMatrix matrix;
-    SkRect tmpSrc, tmpDst;
-    SkRect imageBounds = SkRect::Make(image->bounds());
-
-    // Compute matrix from the two rectangles
-    if (src) {
-        tmpSrc = *src;
-    } else {
-        tmpSrc = imageBounds;
-    }
-    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
-
-    // clip the tmpSrc to the bounds of the bitmap, and recompute dstRect if
-    // needed (if the src was clipped). No check needed if src==null.
-    sk_sp<const SkImage> autoImageUnref;
-    if (src) {
-        if (!imageBounds.contains(*src)) {
-            if (!tmpSrc.intersect(imageBounds)) {
-                return; // nothing to draw
-            }
-            // recompute dst, based on the smaller tmpSrc
-            matrix.mapRect(&tmpDst, tmpSrc);
-        }
-
-        // since we may need to clamp to the borders of the src rect within
-        // the bitmap, we extract a subset.
-        SkIRect srcIR;
-        tmpSrc.roundOut(&srcIR);
-
-        autoImageUnref = image->makeSubset(srcIR);
-        if (!autoImageUnref) {
-            return;
-        }
-        image = autoImageUnref.get();
-        // Since we did an extract, we need to adjust the matrix accordingly
-        SkScalar dx = 0, dy = 0;
-        if (srcIR.fLeft > 0) {
-            dx = SkIntToScalar(srcIR.fLeft);
-        }
-        if (srcIR.fTop > 0) {
-            dy = SkIntToScalar(srcIR.fTop);
-        }
-        if (dx || dy) {
-            matrix.preTranslate(dx, dy);
-        }
-    }
-    matrix.postConcat(*draw.fMatrix);
-    this->internalDrawImage(matrix, draw.fClipStack, *draw.fClip, image,
-                            nullptr, paint);
+    SkASSERT(false);
 }
 
 //  Create a PDF string. Maximum length (in bytes) is 65,535.
 //  @param input     A string value.
 //  @param len       The length of the input array.
 //  @param wideChars True iff the upper byte in each uint16_t is
 //                   significant and should be encoded and not
 //                   discarded.  If true, the upper byte is encoded
 //                   first.  Otherwise, we assert the upper byte is
 //                   zero.
@@ skipping 1136 matching lines @@
         pdfimage.reset(SkPDFCreateBitmapObject(
                                image, fCanon->getPixelSerializer()));
         if (!pdfimage) {
             return;
         }
         fCanon->addPDFBitmap(image->uniqueID(), pdfimage.get());
     }
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
                                 &content.entry()->fContent);
 }