SkBitmap now really stores SkImageInfo -- config is just a ruse

include/core/SkBitmap.h

Index: include/core/SkBitmap.h
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 4951cf19cf7b15ef70dd1a09035f2ef7b95dbcce..164663dbae91ef0282f952a54076f023b299b8f8 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -79,9 +79,41 @@ public:
     //  This method is not exported to java.
     void swap(SkBitmap& other);
 
+    ///////////////////////////////////////////////////////////////////////////
+
+    const SkImageInfo& info() const { return fInfo; }
+
+    int width() const { return fInfo.fWidth; }

[scroggo, 2014/02/10 21:45:44]

Why did width and height lose the doc stating that they are in pixels?

[reed1, 2014/02/10 21:59:51]

If you think it adds value, I will add it. I didn't think there was any
confusion of what the returned value could possibly mean.

+    int height() const { return fInfo.fHeight; }
+    SkColorType colorType() const { return fInfo.fColorType; }
+    SkAlphaType alphaType() const { return fInfo.fAlphaType; }
+    
+    /** Return the number of bytes per pixel based on the config. If the config
+     does not have at least 1 byte per (e.g. kA1_Config) then 0 is returned.
+     */
+    int bytesPerPixel() const { return fInfo.bytesPerPixel(); }
+    
+    /** Return the rowbytes expressed as a number of pixels (like width and
+     height). Note, for 1-byte per pixel configs like kA8_Config, this will
+     return the same as rowBytes(). Is undefined for configs that are less
+     than 1-byte per pixel (e.g. kA1_Config)
+     */
+    int rowBytesAsPixels() const {
+        return fRowBytes >> this->shiftPerPixel();
+    }
+
+    /** Return the shift amount per pixel (i.e. 0 for 1-byte per pixel, 1 for
+     2-bytes per pixel configs, 2 for 4-bytes per pixel configs). Return 0
+     for configs that are not at least 1-byte per pixel (e.g. kA1_Config
+     or kNo_Config)
+     */
+    int shiftPerPixel() const { return this->bytesPerPixel() >> 1; }
+
+    ///////////////////////////////////////////////////////////////////////////
+
     /** Return true iff the bitmap has empty dimensions.
     */
-    bool empty() const { return 0 == fWidth || 0 == fHeight; }
+    bool empty() const { return fInfo.isEmpty(); }
 
     /** Return true iff the bitmap has no pixelref. Note: this can return true even if the
         dimensions of the bitmap are > 0 (see empty()).
@@ -89,41 +121,14 @@ public:
     bool isNull() const { return NULL == fPixelRef; }
 
     /** Return the config for the bitmap. */
-    Config  config() const { return (Config)fConfig; }
+    Config  config() const;
 
     SK_ATTR_DEPRECATED("use config()")
     Config  getConfig() const { return this->config(); }
 
-    /** Return the bitmap's width, in pixels. */
-    int width() const { return fWidth; }
-
-    /** Return the bitmap's height, in pixels. */
-    int height() const { return fHeight; }
-
     /** Return the number of bytes between subsequent rows of the bitmap. */
     size_t rowBytes() const { return fRowBytes; }
 
-    /** Return the shift amount per pixel (i.e. 0 for 1-byte per pixel, 1 for
-        2-bytes per pixel configs, 2 for 4-bytes per pixel configs). Return 0
-        for configs that are not at least 1-byte per pixel (e.g. kA1_Config
-        or kNo_Config)
-    */
-    int shiftPerPixel() const { return fBytesPerPixel >> 1; }
-
-    /** Return the number of bytes per pixel based on the config. If the config
-        does not have at least 1 byte per (e.g. kA1_Config) then 0 is returned.
-    */
-    int bytesPerPixel() const { return fBytesPerPixel; }
-
-    /** Return the rowbytes expressed as a number of pixels (like width and
-        height). Note, for 1-byte per pixel configs like kA8_Config, this will
-        return the same as rowBytes(). Is undefined for configs that are less
-        than 1-byte per pixel (e.g. kA1_Config)
-    */
-    int rowBytesAsPixels() const { return fRowBytes >> (fBytesPerPixel >> 1); }
-
-    SkAlphaType alphaType() const { return (SkAlphaType)fAlphaType; }
-
     /**
      *  Set the bitmap's alphaType, returning true on success. If false is
      *  returned, then the specified new alphaType is incompatible with the
@@ -143,19 +148,19 @@ public:
         Note this truncates the result to 32bits. Call getSize64() to detect
         if the real size exceeds 32bits.
     */
-    size_t getSize() const { return fHeight * fRowBytes; }
+    size_t getSize() const { return fInfo.fHeight * fRowBytes; }

[scroggo, 2014/02/10 21:45:44]

Is it okay that this will return zero for a new style SkBitmap that is not
locked?

[reed1, 2014/02/10 21:59:51]

Who knows what the future will bring.

 
     /** Return the number of bytes from the pointer returned by getPixels()
         to the end of the allocated space in the buffer. Required in
         cases where extractSubset has been called.
     */
-    size_t getSafeSize() const ;
+    size_t getSafeSize() const { return fInfo.getSafeSize(fRowBytes); }

[scroggo, 2014/02/10 21:45:44]

Same question.

[reed1, 2014/02/10 21:59:51]

Always in motion is the future.

 
     /**
      *  Return the full size of the bitmap, in bytes.
      */
     int64_t computeSize64() const {
-        return sk_64_mul(fHeight, fRowBytes);
+        return sk_64_mul(fInfo.fHeight, fRowBytes);
     }
 
     /**
@@ -164,7 +169,7 @@ public:
      *  than computeSize64() if there is any rowbytes padding beyond the width.
      */
     int64_t computeSafeSize64() const {
-        return ComputeSafeSize64((Config)fConfig, fWidth, fHeight, fRowBytes);
+        return fInfo.getSafeSize64(fRowBytes);
     }
 
     /** Returns true if this bitmap is marked as immutable, meaning that the
@@ -298,11 +303,18 @@ public:
                        void* context);
 
     /**
-     *  If the bitmap's config can be represented as SkImageInfo, return true,
-     *  and if info is not-null, set it to the bitmap's info. If it cannot be
-     *  represented as SkImageInfo, return false and ignore the info parameter.
+     *  DEPRECATED: call info().
      */
-    bool asImageInfo(SkImageInfo* info) const;
+    bool asImageInfo(SkImageInfo* info) const {
+        // compatibility: return false for kUnknown
+        if (kUnknown_SkColorType == this->colorType()) {
+            return false;
+        }
+        if (info) {
+            *info = this->info();
+        }
+        return true;
+    }
 
     /** Use this to assign a new pixel address for an existing bitmap. This
         will automatically release any pixelref previously installed. Only call
@@ -444,8 +456,8 @@ public:
      */
     GrTexture* getTexture() const;
 
-    /** Return the bitmap's colortable, if it uses one (i.e. fConfig is
-        kIndex8_Config) and the pixels are locked.
+    /** Return the bitmap's colortable, if it uses one (i.e. colorType is
+        Index_8) and the pixels are locked.
         Otherwise returns NULL. Does not affect the colortable's
         reference count.
     */
@@ -736,13 +748,11 @@ private:
 #endif
     };
 
+    SkImageInfo fInfo;
+
     uint32_t    fRowBytes;
-    uint32_t    fWidth;
-    uint32_t    fHeight;
-    uint8_t     fConfig;
-    uint8_t     fAlphaType;
+
     uint8_t     fFlags;
-    uint8_t     fBytesPerPixel; // based on config
 
     void internalErase(const SkIRect&, U8CPU a, U8CPU r, U8CPU g, U8CPU b)const;
 
@@ -854,29 +864,29 @@ private:
 
 inline uint32_t* SkBitmap::getAddr32(int x, int y) const {
     SkASSERT(fPixels);
-    SkASSERT(fConfig == kARGB_8888_Config);
-    SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
+    SkASSERT(this->config() == kARGB_8888_Config);
+    SkASSERT((unsigned)x < (unsigned)this->width() && (unsigned)y < (unsigned)this->height());
     return (uint32_t*)((char*)fPixels + y * fRowBytes + (x << 2));
 }
 
 inline uint16_t* SkBitmap::getAddr16(int x, int y) const {
     SkASSERT(fPixels);
-    SkASSERT(fConfig == kRGB_565_Config || fConfig == kARGB_4444_Config);
-    SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
+    SkASSERT(this->config() == kRGB_565_Config || this->config() == kARGB_4444_Config);
+    SkASSERT((unsigned)x < (unsigned)this->width() && (unsigned)y < (unsigned)this->height());
     return (uint16_t*)((char*)fPixels + y * fRowBytes + (x << 1));
 }
 
 inline uint8_t* SkBitmap::getAddr8(int x, int y) const {
     SkASSERT(fPixels);
-    SkASSERT(fConfig == kA8_Config || fConfig == kIndex8_Config);
-    SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
+    SkASSERT(this->config() == kA8_Config || this->config() == kIndex8_Config);
+    SkASSERT((unsigned)x < (unsigned)this->width() && (unsigned)y < (unsigned)this->height());
     return (uint8_t*)fPixels + y * fRowBytes + x;
 }
 
 inline SkPMColor SkBitmap::getIndex8Color(int x, int y) const {
     SkASSERT(fPixels);
-    SkASSERT(fConfig == kIndex8_Config);
-    SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
+    SkASSERT(this->config() == kIndex8_Config);
+    SkASSERT((unsigned)x < (unsigned)this->width() && (unsigned)y < (unsigned)this->height());
     SkASSERT(fColorTable);
     return (*fColorTable)[*((const uint8_t*)fPixels + y * fRowBytes + x)];
 }