f9764a4f53
This change adds a new DrawLinearGradientProgram class to enable the drawing of linear gradients. Two new vertex and fragment shaders are introduced, based on DrawTextureProgram's shaders. Change-Id: I885afc076bb6cef8cd3962ae21a086fa6a03bf96
96 lines
3.7 KiB
Java
96 lines
3.7 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics;
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public class LinearGradient extends Shader {
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/**
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* These fields are manipulated by the JNI layer, don't touch!
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* @hide
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*/
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public int bounds;
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/**
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* @hide
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*/
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public int colors;
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/**
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* @hide
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*/
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public int positions;
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/**
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* @hide
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*/
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public int count;
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/**
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* @hide
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*/
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public int tileMode;
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/** Create a shader that draws a linear gradient along a line.
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@param x0 The x-coordinate for the start of the gradient line
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@param y0 The y-coordinate for the start of the gradient line
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@param x1 The x-coordinate for the end of the gradient line
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@param y1 The y-coordinate for the end of the gradient line
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@param colors The colors to be distributed along the gradient line
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@param positions May be null. The relative positions [0..1] of
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each corresponding color in the colors array. If this is null,
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the the colors are distributed evenly along the gradient line.
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@param tile The Shader tiling mode
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*/
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public LinearGradient(float x0, float y0, float x1, float y1,
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int colors[], float positions[], TileMode tile) {
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if (colors.length < 2) {
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throw new IllegalArgumentException("needs >= 2 number of colors");
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}
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if (positions != null && colors.length != positions.length) {
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throw new IllegalArgumentException("color and position arrays must be of equal length");
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}
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native_instance = nativeCreate1(x0, y0, x1, y1, colors, positions, tile.nativeInt);
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count = colors.length;
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tileMode = tile.nativeInt;
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}
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/** Create a shader that draws a linear gradient along a line.
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@param x0 The x-coordinate for the start of the gradient line
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@param y0 The y-coordinate for the start of the gradient line
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@param x1 The x-coordinate for the end of the gradient line
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@param y1 The y-coordinate for the end of the gradient line
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@param color0 The color at the start of the gradient line.
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@param color1 The color at the end of the gradient line.
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@param tile The Shader tiling mode
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*/
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public LinearGradient(float x0, float y0, float x1, float y1,
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int color0, int color1, TileMode tile) {
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native_instance = nativeCreate2(x0, y0, x1, y1, color0, color1, tile.nativeInt);
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count = 2;
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tileMode = tile.nativeInt;
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}
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protected void finalize() throws Throwable {
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try {
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super.finalize();
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} finally {
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nativeDestructor(native_instance);
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}
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}
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private native void nativeDestructor(int native_shader);
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private native int nativeCreate1(float x0, float y0, float x1, float y1,
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int colors[], float positions[], int tileMode);
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private native int nativeCreate2(float x0, float y0, float x1, float y1,
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int color0, int color1, int tileMode);
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}
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