Rename SkGifCodec, SkIcoCodec, SkWbmpCodec

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1567863003

Review URL: https://codereview.chromium.org/1567863003

1 files changed, 87 insertions, 0 deletions

diff --git a/src/codec/SkIcoCodec.h b/src/codec/SkIcoCodec.h
new file mode 100644
index 0000000000..9a3f248af5
--- /dev/null
+++ b/src/codec/SkIcoCodec.h
@@ -0,0 +1,87 @@
+/*
+ * 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 "SkCodec.h"
+#include "SkImageInfo.h"
+#include "SkStream.h"
+#include "SkTypes.h"
+
+/*
+ * This class implements the decoding for bmp images
+ */
+class SkIcoCodec : public SkCodec {
+public:
+    static bool IsIco(const void*, size_t);
+
+    /*
+     * Assumes IsIco was called and returned true
+     * Creates an Ico decoder
+     * Reads enough of the stream to determine the image format
+     */
+    static SkCodec* NewFromStream(SkStream*);
+
+protected:
+
+    /*
+     * Chooses the best dimensions given the desired scale
+     */
+    SkISize onGetScaledDimensions(float desiredScale) const override;
+
+    bool onDimensionsSupported(const SkISize&) override;
+
+    /*
+     * Initiates the Ico decode
+     */
+    Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
+            SkPMColor*, int*, int*) override;
+
+    SkEncodedFormat onGetEncodedFormat() const override {
+        return kICO_SkEncodedFormat;
+    }
+
+    SkScanlineOrder onGetScanlineOrder() const override;
+
+private:
+
+    Result onStartScanlineDecode(const SkImageInfo& dstInfo, const SkCodec::Options& options,
+            SkPMColor inputColorPtr[], int* inputColorCount) override;
+
+    int onGetScanlines(void* dst, int count, size_t rowBytes) override;
+
+    bool onSkipScanlines(int count) override;
+
+    SkSampler* getSampler(bool createIfNecessary) override;
+
+    /*
+     * Searches fEmbeddedCodecs for a codec that matches requestedSize.
+     * The search starts at startIndex and ends when an appropriate codec
+     * is found, or we have reached the end of the array.
+     *
+     * @return the index of the matching codec or -1 if there is no
+     *         matching codec between startIndex and the end of
+     *         the array.
+     */
+    int chooseCodec(const SkISize& requestedSize, int startIndex);
+
+    /*
+     * Constructor called by NewFromStream
+     * @param embeddedCodecs codecs for the embedded images, takes ownership
+     */
+    SkIcoCodec(const SkImageInfo& srcInfo, SkTArray<SkAutoTDelete<SkCodec>, true>* embeddedCodecs);
+
+    SkAutoTDelete<SkTArray<SkAutoTDelete<SkCodec>, true>> fEmbeddedCodecs; // owned
+
+    // Only used by the scanline decoder.  onStartScanlineDecode() will set
+    // fCurrScanlineCodec to one of the fEmbeddedCodecs, if it can find a
+    // codec of the appropriate size.  We will use fCurrScanlineCodec for
+    // subsequent calls to onGetScanlines() or onSkipScanlines().
+    // fCurrScanlineCodec is owned by this class, but should not be an
+    // SkAutoTDelete.  It will be deleted by the destructor of fEmbeddedCodecs.
+    SkCodec* fCurrScanlineCodec;
+
+    typedef SkCodec INHERITED;
+};