Canvas.java

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/*
 * Copyright 2021 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
package org.skia.jetski;
 
import androidx.annotation.Nullable;
 
public class Canvas {
    private long mNativeInstance;
    private Surface mSurface;
 
    public int getWidth() {
        return nGetWidth(mNativeInstance);
    }
 
    public int getHeight() {
        return nGetHeight(mNativeInstance);
    }
 
    public int save() {
        return nSave(mNativeInstance);
    }
 
    public void restore() {
        nRestore(mNativeInstance);
    }
 
    public void restoreToCount(int count) {
        nRestoreToCount(mNativeInstance, count);
    }
 
    public int saveLayer(@Nullable Paint paint) {
        long nativePaint = 0;
        if (paint != null) {
            nativePaint = paint.getNativeInstance();
        }
        return nSaveLayer(mNativeInstance, nativePaint);
    }
 
    public Matrix getLocalToDevice() {
        long native_matrix = nGetLocalToDevice(mNativeInstance);
        return new Matrix(native_matrix);
    }
 
    public void concat(Matrix m) {
        nConcat(mNativeInstance, m.getNativeInstance());
    }
 
    public void concat(float[] rowMajorMatrix) {
        if (rowMajorMatrix.length != 16) {
            throw new java.lang.IllegalArgumentException("Expecting a 16 float array.");
        }
 
        nConcat16f(mNativeInstance, rowMajorMatrix);
    }
 
    public void translate(float tx, float ty, float tz) {
        nTranslate(mNativeInstance, tx ,ty, tz);
    }
 
    public void translate(float tx, float ty) {
        nTranslate(mNativeInstance, tx ,ty, 0);
    }
 
    public void scale(float sx, float sy, float sz) {
        nScale(mNativeInstance, sx ,sy, sz);
    }
 
    public void scale(float sx, float sy) {
        nScale(mNativeInstance, sx ,sy, 1);
    }
 
    public void clipPath(Path path, ClipOp op, boolean antiAliasing) {
        nClipPath(mNativeInstance, path.getNativeInstance(), op.mNativeInt, antiAliasing);
    }
 
    public void clipRect(float left, float top, float right, float bottom,
                         ClipOp op, boolean antiAliasing) {
        nClipRect(mNativeInstance, left, top, right, bottom, op.mNativeInt, antiAliasing);
    }
 
    public void clipRRect(float left, float top, float right, float bottom, float xRad, float yRad,
                         ClipOp op, boolean antiAliasing) {
        nClipRRect(mNativeInstance, left, top, right, bottom, xRad, yRad, op.mNativeInt, antiAliasing);
    }
 
    public void clipShader(Shader shader, ClipOp op) {
        nClipShader(mNativeInstance, shader.getNativeInstance(), op.mNativeInt);
    }
 
    public void drawRect(float left, float top, float right, float bottom, Paint paint) {
        nDrawRect(mNativeInstance, left, top, right, bottom, paint.getNativeInstance());
    }
 
    public void drawColor(Color c) {
        nDrawColor(mNativeInstance, c.r(), c.g(), c.b(), c.a());
    }
 
    public void drawColor(float r, float g, float b, float a) {
        nDrawColor(mNativeInstance, r, g, b, a);
    }
 
    public void drawColor(int icolor) {
        nDrawColor(mNativeInstance,
            (float)((icolor >> 16) & 0xff) / 255,
            (float)((icolor >>  8) & 0xff) / 255,
            (float)((icolor >>  0) & 0xff) / 255,
            (float)((icolor >> 24) & 0xff) / 255
        );
    }
 
    public void drawImage(Image image, float x, float y) {
        drawImage(image, x, y, new SamplingOptions());
    }
 
    public void drawImage(Image image, float x, float y, SamplingOptions sampling) {
        nDrawImage(mNativeInstance, image.getNativeInstance(), x, y,
                   sampling.getNativeDesc(), sampling.getCubicCoeffB(), sampling.getCubicCoeffC());
    }
 
    public void drawPath(Path path, Paint paint) {
        nDrawPath(mNativeInstance, path.getNativeInstance(), paint.getNativeInstance());
    }
 
    // package private
    Canvas(Surface surface, long native_instance) {
        mNativeInstance = native_instance;
        mSurface = surface;
    }
 
    // package private
    long getNativeInstance() { return mNativeInstance; }
 
    private static native int  nGetWidth(long nativeInstance);
    private static native int  nGetHeight(long nativeInstance);
    private static native int  nSave(long nativeInstance);
    private static native void nRestore(long nativeInstance);
    private static native void nRestoreToCount(long nativeInstance, int count);
    private static native int  nSaveLayer(long nativeInstance, long nativePaint);
    private static native long nGetLocalToDevice(long mNativeInstance);
    private static native void nConcat(long nativeInstance, long nativeMatrix);
    private static native void nConcat16f(long nativeInstance, float[] floatMatrix);
    private static native void nTranslate(long nativeInstance, float tx, float ty, float tz);
    private static native void nScale(long nativeInstance, float sx, float sy, float sz);
 
    private static native void nClipPath(long nativeInstance, long nativePath, int clipOp,
                                         boolean doAA);
    private static native void nClipRect(long nativeInstance, float left, float top, float right,
                                         float bottom, int clipOp, boolean doAA);
    private static native void nClipRRect(long nativeInstance, float left, float top, float right,
                                          float bottom, float xRad, float yRad,
                                          int clipOp, boolean doAA);
    private static native void nClipShader(long nativeInstance, long nativeShader, int clipOp);
 
 
    private static native void nDrawColor(long nativeInstance, float r, float g, float b, float a);
 
    private static native void nDrawRect(long nativeInstance,
                                         float left, float top, float right, float bottom,
                                         long nativePaint);
    private static native void nDrawImage(long nativeInstance, long nativeImage, float x, float y,
                                          int samplingDesc,
                                          float samplingCoeffB, float samplingCoeffC);
    private static native void nDrawPath(long nativeInstance, long nativePath, long nativePaint);
    private static native void nDrawGlyphs(long nativeInstance, char[] glyphs, float[] positions,
                                           float originX, float originY, long nativeFont, long nativePaint);
}