Bitmap

DENSITY_NONE

public static final int DENSITY_NONE

Indicates that the bitmap was created for an unknown pixel density.

Constant Value: 0 (0x00000000)

CREATOR

public static final Creator<Bitmap> CREATOR

asShared

public Bitmap asShared ()

Return an immutable bitmap backed by shared memory which can be efficiently passed between processes via Parcelable.

If this bitmap already meets these criteria it will return itself.

compress

public boolean compress (Bitmap.CompressFormat format, 
                int quality, 
                OutputStream stream)

Write a compressed version of the bitmap to the specified outputstream. If this returns true, the bitmap can be reconstructed by passing a corresponding inputstream to BitmapFactory.decodeStream(). Note: not all Formats support all bitmap configs directly, so it is possible that the returned bitmap from BitmapFactory could be in a different bitdepth, and/or may have lost per-pixel alpha (e.g. JPEG only supports opaque pixels).
This method may take several seconds to complete, so it should only be called from a worker thread.

copy

public Bitmap copy (Bitmap.Config config, 
                boolean isMutable)

Tries to make a new bitmap based on the dimensions of this bitmap, setting the new bitmap's config to the one specified, and then copying this bitmap's pixels into the new bitmap. If the conversion is not supported, or the allocator fails, then this returns NULL. The returned bitmap has the same density and color space as the original, except in the following cases. When copying to Config.ALPHA_8, the color space is dropped. When copying to or from Config.RGBA_F16, EXTENDED or non-EXTENDED variants may be adjusted as appropriate.

copyPixelsFromBuffer

public void copyPixelsFromBuffer (Buffer src)

Copy the pixels from the buffer, beginning at the current position, overwriting the bitmap's pixels. The data in the buffer is not changed in any way (unlike setPixels(), which converts from unpremultipled 32bit to whatever the bitmap's native format is. The pixels in the source buffer are assumed to be in the bitmap's color space.

After this method returns, the current position of the buffer is updated: the position is incremented by the number of elements read from the buffer. If you need to read the bitmap from the buffer again you must first rewind the buffer.

copyPixelsToBuffer

public void copyPixelsToBuffer (Buffer dst)

Copy the bitmap's pixels into the specified buffer (allocated by the caller). An exception is thrown if the buffer is not large enough to hold all of the pixels (taking into account the number of bytes per pixel) or if the Buffer subclass is not one of the support types (ByteBuffer, ShortBuffer, IntBuffer).

The content of the bitmap is copied into the buffer as-is. This means that if this bitmap stores its pixels pre-multiplied (see isPremultiplied(), the values in the buffer will also be pre-multiplied. The pixels remain in the color space of the bitmap.

After this method returns, the current position of the buffer is updated: the position is incremented by the number of elements written in the buffer.

createBitmap

public static Bitmap createBitmap (Bitmap source, 
                int x, 
                int y, 
                int width, 
                int height)

Returns a bitmap from the specified subset of the source bitmap. The new bitmap may be the same object as source, or a copy may have been made. It is initialized with the same density and color space as the original bitmap.

createBitmap

public static Bitmap createBitmap (int[] colors, 
                int width, 
                int height, 
                Bitmap.Config config)

Returns a immutable bitmap with the specified width and height, with each pixel value set to the corresponding value in the colors array. Its initial density is as per getDensity(). The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (Bitmap source, 
                int x, 
                int y, 
                int width, 
                int height, 
                Matrix m, 
                boolean filter)

Returns a bitmap from subset of the source bitmap, transformed by the optional matrix. The new bitmap may be the same object as source, or a copy may have been made. It is initialized with the same density and color space as the original bitmap. If the source bitmap is immutable and the requested subset is the same as the source bitmap itself, then the source bitmap is returned and no new bitmap is created. The returned bitmap will always be mutable except in the following scenarios: (1) In situations where the source bitmap is returned and the source bitmap is immutable (2) The source bitmap is a hardware bitmap. That is getConfig() is equivalent to Config.HARDWARE

createBitmap

public static Bitmap createBitmap (DisplayMetrics display, 
                int width, 
                int height, 
                Bitmap.Config config, 
                boolean hasAlpha, 
                ColorSpace colorSpace)

Returns a mutable bitmap with the specified width and height. Its initial density is determined from the given DisplayMetrics. The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (Bitmap src)

Returns a bitmap from the source bitmap. The new bitmap may be the same object as source, or a copy may have been made. It is initialized with the same density and color space as the original bitmap.

createBitmap

public static Bitmap createBitmap (Picture source)

Creates a Bitmap from the given Picture source of recorded drawing commands. Equivalent to calling createBitmap(android.graphics.Picture, int, int, android.graphics.Bitmap.Config) with width and height the same as the Picture's width and height and a Config.HARDWARE config.

createBitmap

public static Bitmap createBitmap (DisplayMetrics display, 
                int[] colors, 
                int offset, 
                int stride, 
                int width, 
                int height, 
                Bitmap.Config config)

Returns a immutable bitmap with the specified width and height, with each pixel value set to the corresponding value in the colors array. Its initial density is determined from the given DisplayMetrics. The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (DisplayMetrics display, 
                int[] colors, 
                int width, 
                int height, 
                Bitmap.Config config)

Returns a immutable bitmap with the specified width and height, with each pixel value set to the corresponding value in the colors array. Its initial density is determined from the given DisplayMetrics. The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (DisplayMetrics display, 
                int width, 
                int height, 
                Bitmap.Config config)

Returns a mutable bitmap with the specified width and height. Its initial density is determined from the given DisplayMetrics. The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (int[] colors, 
                int offset, 
                int stride, 
                int width, 
                int height, 
                Bitmap.Config config)

Returns a immutable bitmap with the specified width and height, with each pixel value set to the corresponding value in the colors array. Its initial density is as per getDensity(). The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (Picture source, 
                int width, 
                int height, 
                Bitmap.Config config)

Creates a Bitmap from the given Picture source of recorded drawing commands. The bitmap will be immutable with the given width and height. If the width and height are not the same as the Picture's width & height, the Picture will be scaled to fit the given width and height.

createBitmap

public static Bitmap createBitmap (int width, 
                int height, 
                Bitmap.Config config, 
                boolean hasAlpha, 
                ColorSpace colorSpace)

Returns a mutable bitmap with the specified width and height. Its initial density is as per getDensity().

createBitmap

public static Bitmap createBitmap (DisplayMetrics display, 
                int width, 
                int height, 
                Bitmap.Config config, 
                boolean hasAlpha)

Returns a mutable bitmap with the specified width and height. Its initial density is determined from the given DisplayMetrics. The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (int width, 
                int height, 
                Bitmap.Config config)

Returns a mutable bitmap with the specified width and height. Its initial density is as per getDensity(). The newly created bitmap is in the sRGB color space.

createBitmap

public static Bitmap createBitmap (int width, 
                int height, 
                Bitmap.Config config, 
                boolean hasAlpha)

Returns a mutable bitmap with the specified width and height. Its initial density is as per getDensity(). The newly created bitmap is in the sRGB color space.

createScaledBitmap

public static Bitmap createScaledBitmap (Bitmap src, 
                int dstWidth, 
                int dstHeight, 
                boolean filter)

Creates a new bitmap, scaled from an existing bitmap, when possible. If the specified width and height are the same as the current width and height of the source bitmap, the source bitmap is returned and no new bitmap is created.

describeContents

public int describeContents ()

No special parcel contents.

eraseColor

public void eraseColor (int c)

Fills the bitmap's pixels with the specified Color.

eraseColor

public void eraseColor (long color)

Fills the bitmap's pixels with the specified ColorLong.

extractAlpha

public Bitmap extractAlpha ()

Returns a new bitmap that captures the alpha values of the original. This may be drawn with Canvas.drawBitmap(), where the color(s) will be taken from the paint that is passed to the draw call.

extractAlpha

public Bitmap extractAlpha (Paint paint, 
                int[] offsetXY)

Returns a new bitmap that captures the alpha values of the original. These values may be affected by the optional Paint parameter, which can contain its own alpha, and may also contain a MaskFilter which could change the actual dimensions of the resulting bitmap (e.g. a blur maskfilter might enlarge the resulting bitmap). If offsetXY is not null, it returns the amount to offset the returned bitmap so that it will logically align with the original. For example, if the paint contains a blur of radius 2, then offsetXY[] would contains -2, -2, so that drawing the alpha bitmap offset by (-2, -2) and then drawing the original would result in the blur visually aligning with the original.

The initial density of the returned bitmap is the same as the original's.

getAllocationByteCount

public int getAllocationByteCount ()

Returns the size of the allocated memory used to store this bitmap's pixels.

This can be larger than the result of getByteCount() if a bitmap is reused to decode other bitmaps of smaller size, or by manual reconfiguration. See reconfigure(int, int, android.graphics.Bitmap.Config), setWidth(int), setHeight(int), setConfig(android.graphics.Bitmap.Config), and BitmapFactory.Options.inBitmap. If a bitmap is not modified in this way, this value will be the same as that returned by getByteCount().

This value will not change over the lifetime of a Bitmap.

getByteCount

public int getByteCount ()

Returns the minimum number of bytes that can be used to store this bitmap's pixels.

As of Build.VERSION_CODES.KITKAT, the result of this method can no longer be used to determine memory usage of a bitmap. See getAllocationByteCount().

getColor

public Color getColor (int x, 
                int y)

Returns the Color at the specified location. Throws an exception if x or y are out of bounds (negative or >= to the width or height respectively).

getColorSpace

public ColorSpace getColorSpace ()

Returns the color space associated with this bitmap. If the color space is unknown, this method returns null.

getConfig

public Bitmap.Config getConfig ()

If the bitmap's internal config is in one of the public formats, return that config, otherwise return null.

getDensity

public int getDensity ()

Returns the density for this bitmap.

The default density is the same density as the current display, unless the current application does not support different screen densities in which case it is DisplayMetrics.DENSITY_DEFAULT. Note that compatibility mode is determined by the application that was initially loaded into a process -- applications that share the same process should all have the same compatibility, or ensure they explicitly set the density of their bitmaps appropriately.

getGainmap

public Gainmap getGainmap ()

Returns the gainmap or null if the bitmap doesn't contain a gainmap

getGenerationId

public int getGenerationId ()

Returns the generation ID of this bitmap. The generation ID changes whenever the bitmap is modified. This can be used as an efficient way to check if a bitmap has changed.

getHardwareBuffer

public HardwareBuffer getHardwareBuffer ()

getHeight

public int getHeight ()

Returns the bitmap's height

getNinePatchChunk

public byte[] getNinePatchChunk ()

Returns an optional array of private data, used by the UI system for some bitmaps. Not intended to be called by applications.

getPixel

public int getPixel (int x, 
                int y)

Returns the Color at the specified location. Throws an exception if x or y are out of bounds (negative or >= to the width or height respectively). The returned color is a non-premultiplied ARGB value in the sRGB color space.

getPixels

public void getPixels (int[] pixels, 
                int offset, 
                int stride, 
                int x, 
                int y, 
                int width, 
                int height)

Returns in pixels[] a copy of the data in the bitmap. Each value is a packed int representing a Color. The stride parameter allows the caller to allow for gaps in the returned pixels array between rows. For normal packed results, just pass width for the stride value. The returned colors are non-premultiplied ARGB values in the sRGB color space.

getRowBytes

public int getRowBytes ()

Return the number of bytes between rows in the bitmap's pixels. Note that this refers to the pixels as stored natively by the bitmap. If you call getPixels() or setPixels(), then the pixels are uniformly treated as 32bit values, packed according to the Color class.

As of Build.VERSION_CODES.KITKAT, this method should not be used to calculate the memory usage of the bitmap. Instead, see getAllocationByteCount().

getScaledHeight

public int getScaledHeight (int targetDensity)

Convenience method that returns the height of this bitmap divided by the density scale factor. Returns the bitmap's height multiplied by the ratio of the target density to the bitmap's source density

getScaledHeight

public int getScaledHeight (Canvas canvas)

Convenience for calling getScaledHeight(int) with the target density of the given Canvas.

getScaledHeight

public int getScaledHeight (DisplayMetrics metrics)

Convenience for calling getScaledHeight(int) with the target density of the given DisplayMetrics.

getScaledWidth

public int getScaledWidth (int targetDensity)

Convenience method that returns the width of this bitmap divided by the density scale factor. Returns the bitmap's width multiplied by the ratio of the target density to the bitmap's source density

getScaledWidth

public int getScaledWidth (DisplayMetrics metrics)

Convenience for calling getScaledWidth(int) with the target density of the given DisplayMetrics.

getScaledWidth

public int getScaledWidth (Canvas canvas)

Convenience for calling getScaledWidth(int) with the target density of the given Canvas.

getWidth

public int getWidth ()

Returns the bitmap's width

hasAlpha

public boolean hasAlpha ()

Returns true if the bitmap's config supports per-pixel alpha, and if the pixels may contain non-opaque alpha values. For some configs, this is always false (e.g. RGB_565), since they do not support per-pixel alpha. However, for configs that do, the bitmap may be flagged to be known that all of its pixels are opaque. In this case hasAlpha() will also return false. If a config such as ARGB_8888 is not so flagged, it will return true by default.

hasGainmap

public boolean hasGainmap ()

Returns whether or not this Bitmap contains a Gainmap.

hasMipMap

public boolean hasMipMap ()

Indicates whether the renderer responsible for drawing this bitmap should attempt to use mipmaps when this bitmap is drawn scaled down. If you know that you are going to draw this bitmap at less than 50% of its original size, you may be able to obtain a higher quality This property is only a suggestion that can be ignored by the renderer. It is not guaranteed to have any effect.

isMutable

public boolean isMutable ()

Returns true if the bitmap is marked as mutable (i.e. can be drawn into)

isPremultiplied

public boolean isPremultiplied ()

Indicates whether pixels stored in this bitmaps are stored pre-multiplied. When a pixel is pre-multiplied, the RGB components have been multiplied by the alpha component. For instance, if the original color is a 50% translucent red (128, 255, 0, 0), the pre-multiplied form is (128, 128, 0, 0).

This method always returns false if getConfig() is Bitmap.Config.RGB_565.

The return value is undefined if getConfig() is Bitmap.Config.ALPHA_8.

This method only returns true if hasAlpha() returns true. A bitmap with no alpha channel can be used both as a pre-multiplied and as a non pre-multiplied bitmap.

Only pre-multiplied bitmaps may be drawn by the view system or Canvas. If a non-pre-multiplied bitmap with an alpha channel is drawn to a Canvas, a RuntimeException will be thrown.

isRecycled

public boolean isRecycled ()

Returns true if this bitmap has been recycled. If so, then it is an error to try to access its pixels, and the bitmap will not draw.

prepareToDraw

public void prepareToDraw ()

Builds caches associated with the bitmap that are used for drawing it.

Starting in Build.VERSION_CODES.N, this call initiates an asynchronous upload to the GPU on RenderThread, if the Bitmap is not already uploaded. With Hardware Acceleration, Bitmaps must be uploaded to the GPU in order to be rendered. This is done by default the first time a Bitmap is drawn, but the process can take several milliseconds, depending on the size of the Bitmap. Each time a Bitmap is modified and drawn again, it must be re-uploaded.

Calling this method in advance can save time in the first frame it's used. For example, it is recommended to call this on an image decoding worker thread when a decoded Bitmap is about to be displayed. It is recommended to make any pre-draw modifications to the Bitmap before calling this method, so the cached, uploaded copy may be reused without re-uploading.

reconfigure

public void reconfigure (int width, 
                int height, 
                Bitmap.Config config)

Modifies the bitmap to have a specified width, height, and Config, without affecting the underlying allocation backing the bitmap. Bitmap pixel data is not re-initialized for the new configuration.

This method can be used to avoid allocating a new bitmap, instead reusing an existing bitmap's allocation for a new configuration of equal or lesser size. If the Bitmap's allocation isn't large enough to support the new configuration, an IllegalArgumentException will be thrown and the bitmap will not be modified.

The result of getByteCount() will reflect the new configuration, while getAllocationByteCount() will reflect that of the initial configuration.

Note: This may change this result of hasAlpha(). When converting to 565, the new bitmap will always be considered opaque. When converting from 565, the new bitmap will be considered non-opaque, and will respect the value set by setPremultiplied().

WARNING: This method should NOT be called on a bitmap currently in use by the view system, Canvas, or the AndroidBitmap NDK API. It does not make guarantees about how the underlying pixel buffer is remapped to the new config, just that the allocation is reused. Additionally, the view system does not account for bitmap properties being modifying during use, e.g. while attached to drawables.

In order to safely ensure that a Bitmap is no longer in use by the View system it is necessary to wait for a draw pass to occur after invalidate()'ing any view that had previously drawn the Bitmap in the last draw pass due to hardware acceleration's caching of draw commands. As an example, here is how this can be done for an ImageView:

      ImageView myImageView = ...;
      final Bitmap myBitmap = ...;
      myImageView.setImageDrawable(null);
      myImageView.post(new Runnable() {
          public void run() {
              // myBitmap is now no longer in use by the ImageView
              // and can be safely reconfigured.
              myBitmap.reconfigure(...);
          }
      });
 

recycle

public void recycle ()

Free the native object associated with this bitmap, and clear the reference to the pixel data. This will not free the pixel data synchronously; it simply allows it to be garbage collected if there are no other references. The bitmap is marked as "dead", meaning it will throw an exception if getPixels() or setPixels() is called, and will draw nothing. This operation cannot be reversed, so it should only be called if you are sure there are no further uses for the bitmap. This is an advanced call, and normally need not be called, since the normal GC process will free up this memory when there are no more references to this bitmap.

sameAs

public boolean sameAs (Bitmap other)

Given another bitmap, return true if it has the same dimensions, config, and pixel data as this bitmap. If any of those differ, return false. If other is null, return false.
This method may take several seconds to complete, so it should only be called from a worker thread.

setColorSpace

public void setColorSpace (ColorSpace colorSpace)

Modifies the bitmap to have the specified ColorSpace, without affecting the underlying allocation backing the bitmap.

This affects how the framework will interpret the color at each pixel. A bitmap with Config.ALPHA_8 never has a color space, since a color space does not affect the alpha channel. Other Configs must always have a non-null ColorSpace.

setConfig

public void setConfig (Bitmap.Config config)

Convenience method for calling reconfigure(int, int, android.graphics.Bitmap.Config) with the current height and width.

WARNING: this method should not be used on bitmaps currently used by the view system, see reconfigure(int, int, android.graphics.Bitmap.Config) for more details.

setDensity

public void setDensity (int density)

Specifies the density for this bitmap. When the bitmap is drawn to a Canvas that also has a density, it will be scaled appropriately.

setGainmap

public void setGainmap (Gainmap gainmap)

Sets a gainmap on this bitmap, or removes the gainmap if null

setHasAlpha

public void setHasAlpha (boolean hasAlpha)

Tell the bitmap if all of the pixels are known to be opaque (false) or if some of the pixels may contain non-opaque alpha values (true). Note, for some configs (e.g. RGB_565) this call is ignored, since it does not support per-pixel alpha values. This is meant as a drawing hint, as in some cases a bitmap that is known to be opaque can take a faster drawing case than one that may have non-opaque per-pixel alpha values.

setHasMipMap

public void setHasMipMap (boolean hasMipMap)

Set a hint for the renderer responsible for drawing this bitmap indicating that it should attempt to use mipmaps when this bitmap is drawn scaled down. If you know that you are going to draw this bitmap at less than 50% of its original size, you may be able to obtain a higher quality by turning this property on. Note that if the renderer respects this hint it might have to allocate extra memory to hold the mipmap levels for this bitmap. This property is only a suggestion that can be ignored by the renderer. It is not guaranteed to have any effect.

setHeight

public void setHeight (int height)

Convenience method for calling reconfigure(int, int, android.graphics.Bitmap.Config) with the current width and config.

WARNING: this method should not be used on bitmaps currently used by the view system, see reconfigure(int, int, android.graphics.Bitmap.Config) for more details.

setPixel

public void setPixel (int x, 
                int y, 
                int color)

Write the specified Color into the bitmap (assuming it is mutable) at the x,y coordinate. The color must be a non-premultiplied ARGB value in the sRGB color space.

setPixels

public void setPixels (int[] pixels, 
                int offset, 
                int stride, 
                int x, 
                int y, 
                int width, 
                int height)

Replace pixels in the bitmap with the colors in the array. Each element in the array is a packed int representing a non-premultiplied ARGB Color in the sRGB color space.

setPremultiplied

public void setPremultiplied (boolean premultiplied)

Sets whether the bitmap should treat its data as pre-multiplied.

Bitmaps are always treated as pre-multiplied by the view system and Canvas for performance reasons. Storing un-pre-multiplied data in a Bitmap (through setPixel(int, int, int), setPixels(int, int, int, int, int, int, int), or BitmapFactory.Options.inPremultiplied) can lead to incorrect blending if drawn by the framework.

This method will not affect the behavior of a bitmap without an alpha channel, or if hasAlpha() returns false.

Calling createBitmap(Bitmap) or createScaledBitmap(Bitmap, int, int, boolean) with a source Bitmap whose colors are not pre-multiplied may result in a RuntimeException, since those functions require drawing the source, which is not supported for un-pre-multiplied Bitmaps.

setWidth

public void setWidth (int width)

Convenience method for calling reconfigure(int, int, android.graphics.Bitmap.Config) with the current height and config.

WARNING: this method should not be used on bitmaps currently used by the view system, see reconfigure(int, int, android.graphics.Bitmap.Config) for more details.

wrapHardwareBuffer

public static Bitmap wrapHardwareBuffer (HardwareBuffer hardwareBuffer, 
                ColorSpace colorSpace)

Create a hardware bitmap backed by a HardwareBuffer.

The passed HardwareBuffer's usage flags must contain HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE.

The bitmap will keep a reference to the buffer so that callers can safely close the HardwareBuffer without affecting the Bitmap. However the HardwareBuffer must not be modified while a wrapped Bitmap is accessing it. Doing so will result in undefined behavior.

writeToParcel

public void writeToParcel (Parcel p, 
                int flags)

Write the bitmap and its pixels to the parcel. The bitmap can be rebuilt from the parcel by calling CREATOR.createFromParcel(). If this bitmap is Config.HARDWARE, it may be unparceled with a different pixel format (e.g. 565, 8888), but the content will be preserved to the best quality permitted by the final pixel format