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Image¶
Inherits: Resource < RefCounted < Object
Image datatype.
描述¶
Native image datatype. Contains image data which can be converted to an ImageTexture and provides commonly used image processing methods. The maximum width and height for an Image are MAX_WIDTH and MAX_HEIGHT.
An Image cannot be assigned to a texture property of an object directly (such as Sprite2D), and has to be converted manually to an ImageTexture first.
Note: The maximum image size is 16384×16384 pixels due to graphics hardware limitations. Larger images may fail to import.
教程¶
属性¶
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Methods¶
Enumerations¶
enum Format:
Format FORMAT_L8 = 0
Texture format with a single 8-bit depth representing luminance.
Format FORMAT_LA8 = 1
OpenGL texture format with two values, luminance and alpha each stored with 8 bits.
Format FORMAT_R8 = 2
OpenGL texture format RED with a single component and a bitdepth of 8.
Format FORMAT_RG8 = 3
OpenGL texture format RG with two components and a bitdepth of 8 for each.
Format FORMAT_RGB8 = 4
OpenGL texture format RGB with three components, each with a bitdepth of 8.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_RGBA8 = 5
OpenGL texture format RGBA with four components, each with a bitdepth of 8.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_RGBA4444 = 6
OpenGL texture format RGBA with four components, each with a bitdepth of 4.
Format FORMAT_RGB565 = 7
Format FORMAT_RF = 8
OpenGL texture format GL_R32F where there's one component, a 32-bit floating-point value.
Format FORMAT_RGF = 9
OpenGL texture format GL_RG32F where there are two components, each a 32-bit floating-point values.
Format FORMAT_RGBF = 10
OpenGL texture format GL_RGB32F where there are three components, each a 32-bit floating-point values.
Format FORMAT_RGBAF = 11
OpenGL texture format GL_RGBA32F where there are four components, each a 32-bit floating-point values.
Format FORMAT_RH = 12
OpenGL texture format GL_R32F where there's one component, a 16-bit "half-precision" floating-point value.
Format FORMAT_RGH = 13
OpenGL texture format GL_RG32F where there are two components, each a 16-bit "half-precision" floating-point value.
Format FORMAT_RGBH = 14
OpenGL texture format GL_RGB32F where there are three components, each a 16-bit "half-precision" floating-point value.
Format FORMAT_RGBAH = 15
OpenGL texture format GL_RGBA32F where there are four components, each a 16-bit "half-precision" floating-point value.
Format FORMAT_RGBE9995 = 16
A special OpenGL texture format where the three color components have 9 bits of precision and all three share a single 5-bit exponent.
Format FORMAT_DXT1 = 17
The S3TC texture format that uses Block Compression 1, and is the smallest variation of S3TC, only providing 1 bit of alpha and color data being premultiplied with alpha.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_DXT3 = 18
The S3TC texture format that uses Block Compression 2, and color data is interpreted as not having been premultiplied by alpha. Well suited for images with sharp alpha transitions between translucent and opaque areas.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_DXT5 = 19
The S3TC texture format also known as Block Compression 3 or BC3 that contains 64 bits of alpha channel data followed by 64 bits of DXT1-encoded color data. Color data is not premultiplied by alpha, same as DXT3. DXT5 generally produces superior results for transparent gradients compared to DXT3.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_RGTC_R = 20
Texture format that uses Red Green Texture Compression, normalizing the red channel data using the same compression algorithm that DXT5 uses for the alpha channel.
Format FORMAT_RGTC_RG = 21
Texture format that uses Red Green Texture Compression, normalizing the red and green channel data using the same compression algorithm that DXT5 uses for the alpha channel.
Format FORMAT_BPTC_RGBA = 22
Texture format that uses BPTC compression with unsigned normalized RGBA components.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_BPTC_RGBF = 23
Texture format that uses BPTC compression with signed floating-point RGB components.
Format FORMAT_BPTC_RGBFU = 24
Texture format that uses BPTC compression with unsigned floating-point RGB components.
Format FORMAT_ETC = 25
Ericsson Texture Compression format 1, also referred to as "ETC1", and is part of the OpenGL ES graphics standard. This format cannot store an alpha channel.
Format FORMAT_ETC2_R11 = 26
Ericsson Texture Compression format 2 (R11_EAC variant), which provides one channel of unsigned data.
Format FORMAT_ETC2_R11S = 27
Ericsson Texture Compression format 2 (SIGNED_R11_EAC variant), which provides one channel of signed data.
Format FORMAT_ETC2_RG11 = 28
Ericsson Texture Compression format 2 (RG11_EAC variant), which provides two channels of unsigned data.
Format FORMAT_ETC2_RG11S = 29
Ericsson Texture Compression format 2 (SIGNED_RG11_EAC variant), which provides two channels of signed data.
Format FORMAT_ETC2_RGB8 = 30
Ericsson Texture Compression format 2 (RGB8 variant), which is a follow-up of ETC1 and compresses RGB888 data.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_ETC2_RGBA8 = 31
Ericsson Texture Compression format 2 (RGBA8variant), which compresses RGBA8888 data with full alpha support.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_ETC2_RGB8A1 = 32
Ericsson Texture Compression format 2 (RGB8_PUNCHTHROUGH_ALPHA1 variant), which compresses RGBA data to make alpha either fully transparent or fully opaque.
Note: When creating an ImageTexture, an sRGB to linear color space conversion is performed.
Format FORMAT_ETC2_RA_AS_RG = 33
Format FORMAT_DXT5_RA_AS_RG = 34
Format FORMAT_ASTC_4x4 = 35
Adaptive Scalable Texture Compression. This implements the 4x4 (high quality) mode.
Format FORMAT_ASTC_4x4_HDR = 36
Same format as FORMAT_ASTC_4x4, but with the hint to let the GPU know it is used for HDR.
Format FORMAT_ASTC_8x8 = 37
Adaptive Scalable Texture Compression. This implements the 8x8 (low quality) mode.
Format FORMAT_ASTC_8x8_HDR = 38
Same format as FORMAT_ASTC_8x8, but with the hint to let the GPU know it is used for HDR.
Format FORMAT_MAX = 39
Represents the size of the Format enum.
enum Interpolation:
Interpolation INTERPOLATE_NEAREST = 0
Performs nearest-neighbor interpolation. If the image is resized, it will be pixelated.
Interpolation INTERPOLATE_BILINEAR = 1
Performs bilinear interpolation. If the image is resized, it will be blurry. This mode is faster than INTERPOLATE_CUBIC, but it results in lower quality.
Interpolation INTERPOLATE_CUBIC = 2
Performs cubic interpolation. If the image is resized, it will be blurry. This mode often gives better results compared to INTERPOLATE_BILINEAR, at the cost of being slower.
Interpolation INTERPOLATE_TRILINEAR = 3
Performs bilinear separately on the two most-suited mipmap levels, then linearly interpolates between them.
It's slower than INTERPOLATE_BILINEAR, but produces higher-quality results with far fewer aliasing artifacts.
If the image does not have mipmaps, they will be generated and used internally, but no mipmaps will be generated on the resulting image.
Note: If you intend to scale multiple copies of the original image, it's better to call generate_mipmaps] on it in advance, to avoid wasting processing power in generating them again and again.
On the other hand, if the image already has mipmaps, they will be used, and a new set will be generated for the resulting image.
Interpolation INTERPOLATE_LANCZOS = 4
Performs Lanczos interpolation. This is the slowest image resizing mode, but it typically gives the best results, especially when downscalng images.
enum AlphaMode:
AlphaMode ALPHA_NONE = 0
Image does not have alpha.
AlphaMode ALPHA_BIT = 1
Image stores alpha in a single bit.
AlphaMode ALPHA_BLEND = 2
Image uses alpha.
enum CompressMode:
CompressMode COMPRESS_S3TC = 0
Use S3TC compression.
CompressMode COMPRESS_ETC = 1
Use ETC compression.
CompressMode COMPRESS_ETC2 = 2
Use ETC2 compression.
CompressMode COMPRESS_BPTC = 3
Use BPTC compression.
CompressMode COMPRESS_ASTC = 4
Use ASTC compression.
CompressMode COMPRESS_MAX = 5
Represents the size of the CompressMode enum.
enum UsedChannels:
UsedChannels USED_CHANNELS_L = 0
UsedChannels USED_CHANNELS_LA = 1
UsedChannels USED_CHANNELS_R = 2
UsedChannels USED_CHANNELS_RG = 3
UsedChannels USED_CHANNELS_RGB = 4
UsedChannels USED_CHANNELS_RGBA = 5
enum CompressSource:
CompressSource COMPRESS_SOURCE_GENERIC = 0
Source texture (before compression) is a regular texture. Default for all textures.
CompressSource COMPRESS_SOURCE_SRGB = 1
Source texture (before compression) is in sRGB space.
CompressSource COMPRESS_SOURCE_NORMAL = 2
Source texture (before compression) is a normal texture (e.g. it can be compressed into two channels).
enum ASTCFormat:
ASTCFormat ASTC_FORMAT_4x4 = 0
Hint to indicate that the high quality 4x4 ASTC compression format should be used.
ASTCFormat ASTC_FORMAT_8x8 = 1
Hint to indicate that the low quality 8x8 ASTC compression format should be used.
常量¶
MAX_WIDTH = 16777216
The maximal width allowed for Image resources.
MAX_HEIGHT = 16777216
The maximal height allowed for Image resources.
Property Descriptions¶
Dictionary data = { "data": PackedByteArray(), "format": "Lum8", "height": 0, "mipmaps": false, "width": 0 }
Holds all the image's color data in a given format. See Format constants.
Method Descriptions¶
void adjust_bcs ( float brightness, float contrast, float saturation )
There is currently no description for this method. Please help us by contributing one!
void blend_rect ( Image src, Rect2i src_rect, Vector2i dst )
Alpha-blends src_rect from src image to this image at coordinates dst, clipped accordingly to both image bounds. This image and src image must have the same format. src_rect with non-positive size is treated as empty.
void blend_rect_mask ( Image src, Image mask, Rect2i src_rect, Vector2i dst )
Alpha-blends src_rect from src image to this image using mask image at coordinates dst, clipped accordingly to both image bounds. Alpha channels are required for both src and mask. dst pixels and src pixels will blend if the corresponding mask pixel's alpha value is not 0. This image and src image must have the same format. src image and mask image must have the same size (width and height) but they can have different formats. src_rect with non-positive size is treated as empty.
void blit_rect ( Image src, Rect2i src_rect, Vector2i dst )
Copies src_rect from src image to this image at coordinates dst, clipped accordingly to both image bounds. This image and src image must have the same format. src_rect with non-positive size is treated as empty.
void blit_rect_mask ( Image src, Image mask, Rect2i src_rect, Vector2i dst )
Blits src_rect area from src image to this image at the coordinates given by dst, clipped accordingly to both image bounds. src pixel is copied onto dst if the corresponding mask pixel's alpha value is not 0. This image and src image must have the same format. src image and mask image must have the same size (width and height) but they can have different formats. src_rect with non-positive size is treated as empty.
void bump_map_to_normal_map ( float bump_scale=1.0 )
Converts a bump map to a normal map. A bump map provides a height offset per-pixel, while a normal map provides a normal direction per pixel.
void clear_mipmaps ( )
Removes the image's mipmaps.
Error compress ( CompressMode mode, CompressSource source=0, ASTCFormat astc_format=0 )
Compresses the image to use less memory. Can not directly access pixel data while the image is compressed. Returns error if the chosen compression mode is not available.
The source parameter helps to pick the best compression method for DXT and ETC2 formats. It is ignored for ASTC compression.
For ASTC compression, the astc_format parameter must be supplied.
Error compress_from_channels ( CompressMode mode, UsedChannels channels, ASTCFormat astc_format=0 )
Compresses the image to use less memory. Can not directly access pixel data while the image is compressed. Returns error if the chosen compression mode is not available.
This is an alternative to compress that lets the user supply the channels used in order for the compressor to pick the best DXT and ETC2 formats. For other formats (non DXT or ETC2), this argument is ignored.
For ASTC compression, the astc_format parameter must be supplied.
Dictionary compute_image_metrics ( Image compared_image, bool use_luma )
Compute image metrics on the current image and the compared image.
The dictionary contains max, mean, mean_squared, root_mean_squared and peak_snr.
void convert ( Format format )
Converts the image's format. See Format constants.
void copy_from ( Image src )
Copies src image to this image.
Image create ( int width, int height, bool use_mipmaps, Format format ) static
Creates an empty image of given size and format. See Format constants. If use_mipmaps is true, then generate mipmaps for this image. See the generate_mipmaps.
Image create_from_data ( int width, int height, bool use_mipmaps, Format format, PackedByteArray data ) static
Creates a new image of given size and format. See Format constants. Fills the image with the given raw data. If use_mipmaps is true then loads mipmaps for this image from data. See generate_mipmaps.
void crop ( int width, int height )
Crops the image to the given width and height. If the specified size is larger than the current size, the extra area is filled with black pixels.
Error decompress ( )
Decompresses the image if it is VRAM compressed in a supported format. Returns @GlobalScope.OK if the format is supported, otherwise @GlobalScope.ERR_UNAVAILABLE.
Note: The following formats can be decompressed: DXT, RGTC, BPTC. The formats ETC1 and ETC2 are not supported.
AlphaMode detect_alpha ( ) const
Returns ALPHA_BLEND if the image has data for alpha values. Returns ALPHA_BIT if all the alpha values are stored in a single bit. Returns ALPHA_NONE if no data for alpha values is found.
UsedChannels detect_used_channels ( CompressSource source=0 ) const
There is currently no description for this method. Please help us by contributing one!
void fill ( Color color )
Fills the image with color.
void fill_rect ( Rect2i rect, Color color )
Fills rect with color.
void fix_alpha_edges ( )
Blends low-alpha pixels with nearby pixels.
void flip_x ( )
Flips the image horizontally.
void flip_y ( )
Flips the image vertically.
Error generate_mipmaps ( bool renormalize=false )
Generates mipmaps for the image. Mipmaps are precalculated lower-resolution copies of the image that are automatically used if the image needs to be scaled down when rendered. They help improve image quality and performance when rendering. This method returns an error if the image is compressed, in a custom format, or if the image's width/height is 0.
PackedByteArray get_data ( ) const
Returns a copy of the image's raw data.
Format get_format ( ) const
Returns the image's format. See Format constants.
int get_height ( ) const
Returns the image's height.
int get_mipmap_offset ( int mipmap ) const
Returns the offset where the image's mipmap with index mipmap is stored in the data dictionary.
Color get_pixel ( int x, int y ) const
Returns the color of the pixel at (x, y).
This is the same as get_pixelv, but with two integer arguments instead of a Vector2i argument.
Color get_pixelv ( Vector2i point ) const
Returns the color of the pixel at point.
This is the same as get_pixel, but with a Vector2i argument instead of two integer arguments.
Image get_region ( Rect2i region ) const
Returns a new Image that is a copy of this Image's area specified with region.
Vector2i get_size ( ) const
Returns the image's size (width and height).
Rect2i get_used_rect ( ) const
Returns a Rect2i enclosing the visible portion of the image, considering each pixel with a non-zero alpha channel as visible.
int get_width ( ) const
Returns the image's width.
bool has_mipmaps ( ) const
Returns true if the image has generated mipmaps.
bool is_compressed ( ) const
Returns true if the image is compressed.
bool is_empty ( ) const
Returns true if the image has no data.
bool is_invisible ( ) const
Returns true if all the image's pixels have an alpha value of 0. Returns false if any pixel has an alpha value higher than 0.
Loads an image from file path. See Supported image formats for a list of supported image formats and limitations.
Warning: This method should only be used in the editor or in cases when you need to load external images at run-time, such as images located at the user:// directory, and may not work in exported projects.
See also ImageTexture description for usage examples.
Error load_bmp_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a BMP file.
Note: Godot's BMP module doesn't support 16-bit per pixel images. Only 1-bit, 4-bit, 8-bit, 24-bit, and 32-bit per pixel images are supported.
Image load_from_file ( String path ) static
Creates a new Image and loads data from the specified file.
Error load_jpg_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a JPEG file.
Error load_ktx_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a KTX file.
Error load_png_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a PNG file.
Error load_svg_from_buffer ( PackedByteArray buffer, float scale=1.0 )
Loads an image from the UTF-8 binary contents of an uncompressed SVG file (.svg).
Note: Beware when using compressed SVG files (like .svgz), they need to be decompressed before loading.
Note: This method is only available in engine builds with the SVG module enabled. By default, the SVG module is enabled, but it can be disabled at build-time using the module_svg_enabled=no SCons option.
Error load_svg_from_string ( String svg_str, float scale=1.0 )
Loads an image from the string contents of a SVG file (.svg).
Note: This method is only available in engine builds with the SVG module enabled. By default, the SVG module is enabled, but it can be disabled at build-time using the module_svg_enabled=no SCons option.
Error load_tga_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a TGA file.
Error load_webp_from_buffer ( PackedByteArray buffer )
Loads an image from the binary contents of a WebP file.
void normal_map_to_xy ( )
Converts the image's data to represent coordinates on a 3D plane. This is used when the image represents a normal map. A normal map can add lots of detail to a 3D surface without increasing the polygon count.
void premultiply_alpha ( )
Multiplies color values with alpha values. Resulting color values for a pixel are (color * alpha)/256.
void resize ( int width, int height, Interpolation interpolation=1 )
Resizes the image to the given width and height. New pixels are calculated using the interpolation mode defined via Interpolation constants.
void resize_to_po2 ( bool square=false, Interpolation interpolation=1 )
Resizes the image to the nearest power of 2 for the width and height. If square is true then set width and height to be the same. New pixels are calculated using the interpolation mode defined via Interpolation constants.
Image rgbe_to_srgb ( )
Converts a standard RGBE (Red Green Blue Exponent) image to an sRGB image.
void rotate_90 ( ClockDirection direction )
Rotates the image in the specified direction by 90 degrees. The width and height of the image must be greater than 1. If the width and height are not equal, the image will be resized.
void rotate_180 ( )
Rotates the image by 180 degrees. The width and height of the image must be greater than 1.
Error save_exr ( String path, bool grayscale=false ) const
Saves the image as an EXR file to path. If grayscale is true and the image has only one channel, it will be saved explicitly as monochrome rather than one red channel. This function will return @GlobalScope.ERR_UNAVAILABLE if Godot was compiled without the TinyEXR module.
Note: The TinyEXR module is disabled in non-editor builds, which means save_exr will return @GlobalScope.ERR_UNAVAILABLE when it is called from an exported project.
PackedByteArray save_exr_to_buffer ( bool grayscale=false ) const
Saves the image as an EXR file to a byte array. If grayscale is true and the image has only one channel, it will be saved explicitly as monochrome rather than one red channel. This function will return an empty byte array if Godot was compiled without the TinyEXR module.
Note: The TinyEXR module is disabled in non-editor builds, which means save_exr will return an empty byte array when it is called from an exported project.
Error save_jpg ( String path, float quality=0.75 ) const
Saves the image as a JPEG file to path with the specified quality between 0.01 and 1.0 (inclusive). Higher quality values result in better-looking output at the cost of larger file sizes. Recommended quality values are between 0.75 and 0.90. Even at quality 1.00, JPEG compression remains lossy.
Note: JPEG does not save an alpha channel. If the Image contains an alpha channel, the image will still be saved, but the resulting JPEG file won't contain the alpha channel.
PackedByteArray save_jpg_to_buffer ( float quality=0.75 ) const
Saves the image as a JPEG file to a byte array with the specified quality between 0.01 and 1.0 (inclusive). Higher quality values result in better-looking output at the cost of larger byte array sizes (and therefore memory usage). Recommended quality values are between 0.75 and 0.90. Even at quality 1.00, JPEG compression remains lossy.
Note: JPEG does not save an alpha channel. If the Image contains an alpha channel, the image will still be saved, but the resulting byte array won't contain the alpha channel.
Error save_png ( String path ) const
Saves the image as a PNG file to the file at path.
PackedByteArray save_png_to_buffer ( ) const
Saves the image as a PNG file to a byte array.
Error save_webp ( String path, bool lossy=false, float quality=0.75 ) const
Saves the image as a WebP (Web Picture) file to the file at path. By default it will save lossless. If lossy is true, the image will be saved lossy, using the quality setting between 0.0 and 1.0 (inclusive).
PackedByteArray save_webp_to_buffer ( bool lossy=false, float quality=0.75 ) const
Saves the image as a WebP (Web Picture) file to a byte array. By default it will save lossless. If lossy is true, the image will be saved lossy, using the quality setting between 0.0 and 1.0 (inclusive).
void set_data ( int width, int height, bool use_mipmaps, Format format, PackedByteArray data )
Overwrites data of an existing Image. Non-static equivalent of create_from_data.
void set_pixel ( int x, int y, Color color )
Sets the Color of the pixel at (x, y) to color.
Example:
var img_width = 10
var img_height = 5
var img = Image.create(img_width, img_height, false, Image.FORMAT_RGBA8)
img.set_pixel(1, 2, Color.RED) # Sets the color at (1, 2) to red.
int imgWidth = 10;
int imgHeight = 5;
var img = Image.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
img.SetPixel(1, 2, Colors.Red); // Sets the color at (1, 2) to red.
This is the same as set_pixelv, but with a two integer arguments instead of a Vector2i argument.
void set_pixelv ( Vector2i point, Color color )
Sets the Color of the pixel at point to color.
Example:
var img_width = 10
var img_height = 5
var img = Image.create(img_width, img_height, false, Image.FORMAT_RGBA8)
img.set_pixelv(Vector2i(1, 2), Color.RED) # Sets the color at (1, 2) to red.
int imgWidth = 10;
int imgHeight = 5;
var img = Image.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
img.SetPixelv(new Vector2I(1, 2), Colors.Red); // Sets the color at (1, 2) to red.
This is the same as set_pixel, but with a Vector2i argument instead of two integer arguments.
void shrink_x2 ( )
Shrinks the image by a factor of 2.
void srgb_to_linear ( )
Converts the raw data from the sRGB colorspace to a linear scale.