| dleft | Specifies the left position of the destination rectangle (in the image coordinates of the destination layer) in pixels. |
| dtop | Specifies the top position of the destination rectangle (in the image coordinates of the destination layer) in pixels. |
| dwidth | Specifies the width of the destination rectangle (in the image coordinates of the destination layer) in pixels. |
| dheight | Specifies the height of the destination rectangle (in the image coordinates of the destination layer) in pixels. |
| src | Specifies the source layer object. Bitmap class objects can also be specified. (Since 1.1.0) |
| sleft | Specifies the left position of the source rectangle (in the image coordinates of the source layer) in pixels. |
| stop | Specifies the top position of the source rectangle (in the image coordinates of the source layer) in pixels. |
| swidth | Specifies the width of the source rectangle (in the image coordinates of the source layer) in pixels. |
| sheight | Specifies the height of the source rectangle (in the image coordinates of the source layer) in pixels. |
| type | Specifies the scaling type. stNearest : Nearest neighbor method is used. stFastLinear : Low-precision linear interpolation is used (partially implemented). stSemiFastLinear : Fixed-point linear interpolation is used (Since 1.3). stLinear : Linear interpolation is used (Implementation changed since 1.3). stFastCubic : Fixed-point cubic interpolation is used (Since 1.3). stCubic : Cubic interpolation is used (Implementation changed since 1.3). stFastLanczos2 : Fixed-point Lanczos interpolation (4x4 range) is used (Since 1.3). stLanczos2 : Lanczos interpolation (4x4 range) is used (Since 1.3). stFastLanczos3 : Fixed-point Lanczos interpolation (6x6 range) is used (Since 1.3). stLanczos3 : Lanczos interpolation (6x6 range) is used (Since 1.3). stFastSpline16 : Fixed-point spline interpolation (4x4) is used (Since 1.3). stSpline16 : Spline interpolation (4x4) is used (Since 1.3). stFastSpline36 : Fixed-point spline interpolation (6x6) is used (Since 1.3). stSpline36 : Spline interpolation (6x6) is used (Since 1.3). stFastAreaAvg : Fixed-point area average reduction is used. Scaling up is not possible (Since 1.3). stAreaAvg : Area average reduction is used. Scaling up is not possible (Since 1.3). stFastGaussian : Fixed-point Gaussian interpolation (4x4) is used (Since 1.3). stGaussian : Gaussian interpolation (4x4) is used (Since 1.3). stFastBlackmanSinc : Fixed-point Blackman-Sinc interpolation (8x8) is used (Since 1.3). stBlackmanSinc : Blackman-Sinc interpolation (8x8) is used (Since 1.3). Speed is faster in the order of stNearest > stFastLinear > stLinear > stCubic, but the faster the type, the lower the image quality. Interpolation methods from stCubic onwards are high enough quality that the choice is a matter of preference. However, Gaussian interpolation results in a blurred image quality. The difference between stFastLinear and other linear interpolations (stSemiFastLinear and stLinear) is significant when scaling down. While stFastLinear always references the surrounding 4 pixels, stSemiFastLinear and stLinear reference a wider range of pixels during reduction so that the influence range is 4 pixels at 1:1 scale, resulting in higher quality (this is the true linear interpolation algorithm). For stFastLinear, stRefNoClip can be added using a bitwise OR. In this case, it allows referencing areas outside the source bitmap to synthesize colors. If this is not specified, it will not reference outside the source bitmap even if there is margin around it (colors outside the range are treated as the color of the nearest pixel within the range). |
| option | Added in 1.3 or later. Sharpness for cubic interpolation. It currently has no meaning for other interpolation methods. Increasing the sharpness value in the positive direction makes it blurrier, and increasing it in the negative direction makes it sharper. |