Scanline decoding for bmp

src/codec/SkBmpRLECodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBmpRLECodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 27 matching lines @@
         default:
             return false;
     }
 }
 
 /*
  * Creates an instance of the decoder
  * Called only by NewFromStream
  */
 SkBmpRLECodec::SkBmpRLECodec(const SkImageInfo& info, SkStream* stream,
+                             SkBmpCodec::BmpInputFormat inputFormat,
                              uint16_t bitsPerPixel, uint32_t numColors,
                              uint32_t bytesPerColor, uint32_t offset,
                              SkBmpCodec::RowOrder rowOrder, size_t RLEBytes)
-    : INHERITED(info, stream, bitsPerPixel, rowOrder)
+    : INHERITED(info, stream, inputFormat, bitsPerPixel, rowOrder)
     , fColorTable(NULL)
     , fNumColors(this->computeNumColors(numColors))
     , fBytesPerColor(bytesPerColor)
     , fOffset(offset)
     , fStreamBuffer(SkNEW_ARRAY(uint8_t, RLEBytes))
     , fRLEBytes(RLEBytes)
     , fCurrRLEByte(0)
 {}
 
 /*
@@ skipping 406 matching lines @@
                 // Set the indicated number of pixels
                 for (int which = 0; x < endX; x++) {
                     setPixel(dst, dstRowBytes, dstInfo, x, y,
                             indices[which]);
                     which = !which;
                 }
             }
         }
     }
 }
+
+SkCodec::Result SkBmpRLECodec::onStart(const SkImageInfo& dstInfo,
+        const SkCodec::Options& options, SkPMColor inputColorPtr[], int* inputColorCount) {
+    // Create the color table if necessary and prepare the stream for decode
+    // Note that if it is non-NULL, inputColorCount will be modified
+    if (!this->createColorTable(inputColorCount)) {
+        SkCodecPrintf("Error: could not create color table.\n");
+        return SkCodec::kInvalidInput;
+    }
+
+    // Copy the color table to the client if necessary
+    copy_color_table(dstInfo, this->fColorTable, inputColorPtr, inputColorCount);
+
+    // Initialize a buffer for encoded RLE data
+    if (!this->initializeStreamBuffer()) {
+        SkCodecPrintf("Error: cannot initialize swizzler.\n");
+        return SkCodec::kInvalidConversion;
+    }
+
+    return SkCodec::kSuccess;
+}