Make GrTextureStripAtlas flush pending IO on newly acquired texture

src/gpu/effects/GrTextureStripAtlas.h

Index: src/gpu/effects/GrTextureStripAtlas.h
diff --git a/src/gpu/effects/GrTextureStripAtlas.h b/src/gpu/effects/GrTextureStripAtlas.h
deleted file mode 100644
index 5b90a342d7f90af5e8dcd39b28eb68ba4bdbc2ee..0000000000000000000000000000000000000000
--- a/src/gpu/effects/GrTextureStripAtlas.h
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrTextureStripAtlas_DEFINED
-#define GrTextureStripAtlas_DEFINED
-
-#include "SkBitmap.h"
-#include "SkOpts.h"
-#include "SkGr.h"
-#include "SkTDArray.h"
-#include "SkTDynamicHash.h"
-#include "SkTypes.h"
-
-/**
- * Maintains a single large texture whose rows store many textures of a small fixed height,
- * stored in rows across the x-axis such that we can safely wrap/repeat them horizontally.
- */
-class GrTextureStripAtlas {
-public:
-    /**
-     * Descriptor struct which we'll use as a hash table key
-     **/
-    struct Desc {
-        Desc() { sk_bzero(this, sizeof(*this)); }
-        GrContext* fContext;
-        GrPixelConfig fConfig;
-        uint16_t fWidth, fHeight, fRowHeight;
-        uint16_t fUnusedPadding;
-        bool operator==(const Desc& other) const {
-            return 0 == memcmp(this, &other, sizeof(Desc));
-        }
-    };
-
-    /**
-     * Try to find an atlas with the required parameters, creates a new one if necessary
-     */
-    static GrTextureStripAtlas* GetAtlas(const Desc& desc);
-
-    ~GrTextureStripAtlas();
-
-    /**
-     * Add a texture to the atlas
-     *  @param data Bitmap data to copy into the row
-     *  @return The row index we inserted into, or -1 if we failed to find an open row. The caller
-     *      is responsible for calling unlockRow() with this row index when it's done with it.
-     */
-    int lockRow(const SkBitmap& data);
-    void unlockRow(int row);
-
-    /**
-     * These functions help turn an integer row index in [0, 1, 2, ... numRows] into a scalar y
-     * texture coordinate in [0, 1] that we can use in a shader.
-     *
-     * If a regular texture access without using the atlas looks like:
-     *
-     *      texture2D(sampler, vec2(x, y))
-     *
-     * Then when using the atlas we'd replace it with:
-     *
-     *       texture2D(sampler, vec2(x, yOffset + y * scaleFactor))
-     *
-     * Where yOffset, returned by getYOffset(), is the offset to the start of the row within the
-     * atlas and scaleFactor, returned by getNormalizedTexelHeight, is the normalized height of
-     * one texel row.
-     */
-    SkScalar getYOffset(int row) const { return SkIntToScalar(row) / fNumRows; }
-    SkScalar getNormalizedTexelHeight() const { return fNormalizedYHeight; }
-
-    GrContext* getContext() const { return fDesc.fContext; }
-    GrTexture* getTexture() const { return fTexture; }
-
-private:
-
-    // Key to indicate an atlas row without any meaningful data stored in it
-    const static uint32_t kEmptyAtlasRowKey = 0xffffffff;
-
-    /**
-     * The state of a single row in our cache, next/prev pointers allow these to be chained
-     * together to represent LRU status
-     */
-    struct AtlasRow : SkNoncopyable {
-        AtlasRow() : fKey(kEmptyAtlasRowKey), fLocks(0), fNext(nullptr), fPrev(nullptr) { }
-        // GenerationID of the bitmap that is represented by this row, 0xffffffff means "empty"
-        uint32_t fKey;
-        // How many times this has been locked (0 == unlocked)
-        int32_t fLocks;
-        // We maintain an LRU linked list between unlocked nodes with these pointers
-        AtlasRow* fNext;
-        AtlasRow* fPrev;
-    };
-
-    /**
-     * We'll only allow construction via the static GrTextureStripAtlas::GetAtlas
-     */
-    GrTextureStripAtlas(Desc desc);
-
-    void lockTexture();
-    void unlockTexture();
-
-    /**
-     * Initialize our LRU list (if one already exists, clear it and start anew)
-     */
-    void initLRU();
-
-    /**
-     * Grabs the least recently used free row out of the LRU list, returns nullptr if no rows are free.
-     */
-    AtlasRow* getLRU();
-
-    void appendLRU(AtlasRow* row);
-    void removeFromLRU(AtlasRow* row);
-
-    /**
-     * Searches the key table for a key and returns the index if found; if not found, it returns
-     * the bitwise not of the index at which we could insert the key to maintain a sorted list.
-     **/
-    int searchByKey(uint32_t key);
-
-    /**
-     * Compare two atlas rows by key, so we can sort/search by key
-     */
-    static bool KeyLess(const AtlasRow& lhs, const AtlasRow& rhs) {
-        return lhs.fKey < rhs.fKey;
-    }
-
-#ifdef SK_DEBUG
-    void validate();
-#endif
-
-    /**
-     * Clean up callback registered with GrContext. Allows this class to
-     * free up any allocated AtlasEntry and GrTextureStripAtlas objects
-     */
-    static void CleanUp(const GrContext* context, void* info);
-
-    // Hash table entry for atlases
-    class AtlasEntry : public ::SkNoncopyable {
-    public:
-        // for SkTDynamicHash
-        static const Desc& GetKey(const AtlasEntry& entry) { return entry.fDesc; }
-        static uint32_t Hash(const Desc& desc) { return SkOpts::hash(&desc, sizeof(Desc)); }
-
-        // AtlasEntry proper
-        AtlasEntry() : fAtlas(nullptr) {}
-        ~AtlasEntry() { delete fAtlas; }
-        Desc fDesc;
-        GrTextureStripAtlas* fAtlas;
-    };
-
-    class Hash;
-    static Hash* gAtlasCache;
-
-    static Hash* GetCache();
-
-    // We increment gCacheCount for each atlas
-    static int32_t gCacheCount;
-
-    // A unique ID for this texture (formed with: gCacheCount++), so we can be sure that if we
-    // get a texture back from the texture cache, that it's the same one we last used.
-    const int32_t fCacheKey;
-
-    // Total locks on all rows (when this reaches zero, we can unlock our texture)
-    int32_t fLockedRows;
-
-    const Desc fDesc;
-    const uint16_t fNumRows;
-    GrTexture* fTexture;
-
-    SkScalar fNormalizedYHeight;
-
-    // Array of AtlasRows which store the state of all our rows. Stored in a contiguous array, in
-    // order that they appear in our texture, this means we can subtract this pointer from a row
-    // pointer to get its index in the texture, and can save storing a row number in AtlasRow.
-    AtlasRow* fRows;
-
-    // Head and tail for linked list of least-recently-used rows (front = least recently used).
-    // Note that when a texture is locked, it gets removed from this list until it is unlocked.
-    AtlasRow* fLRUFront;
-    AtlasRow* fLRUBack;
-
-    // A list of pointers to AtlasRows that currently contain cached images, sorted by key
-    SkTDArray<AtlasRow*> fKeyTable;
-};
-
-#endif