125 * @param hints the specified <code>RenderingHints</code>, or
126 * <code>null</code>
127 */
128 public RescaleOp (float scaleFactor, float offset, RenderingHints hints) {
129 length = 1;
130 this.scaleFactors = new float[1];
131 this.offsets = new float[1];
132 this.scaleFactors[0] = scaleFactor;
133 this.offsets[0] = offset;
134 this.hints = hints;
135 }
136
137 /**
138 * Returns the scale factors in the given array. The array is also
139 * returned for convenience. If scaleFactors is null, a new array
140 * will be allocated.
141 * @param scaleFactors the array to contain the scale factors of
142 * this <code>RescaleOp</code>
143 * @return the scale factors of this <code>RescaleOp</code>.
144 */
145 final public float[] getScaleFactors (float scaleFactors[]) {
146 if (scaleFactors == null) {
147 return this.scaleFactors.clone();
148 }
149 System.arraycopy (this.scaleFactors, 0, scaleFactors, 0,
150 Math.min(this.scaleFactors.length,
151 scaleFactors.length));
152 return scaleFactors;
153 }
154
155 /**
156 * Returns the offsets in the given array. The array is also returned
157 * for convenience. If offsets is null, a new array
158 * will be allocated.
159 * @param offsets the array to contain the offsets of
160 * this <code>RescaleOp</code>
161 * @return the offsets of this <code>RescaleOp</code>.
162 */
163 final public float[] getOffsets(float offsets[]) {
164 if (offsets == null) {
165 return this.offsets.clone();
166 }
167
168 System.arraycopy (this.offsets, 0, offsets, 0,
169 Math.min(this.offsets.length, offsets.length));
170 return offsets;
171 }
172
173 /**
174 * Returns the number of scaling factors and offsets used in this
175 * RescaleOp.
176 * @return the number of scaling factors and offsets of this
177 * <code>RescaleOp</code>.
178 */
179 final public int getNumFactors() {
180 return length;
181 }
182
183
184 /**
185 * Creates a ByteLookupTable to implement the rescale.
186 * The table may have either a SHORT or BYTE input.
187 * @param nElems Number of elements the table is to have.
188 * This will generally be 256 for byte and
189 * 65536 for short.
190 */
191 private ByteLookupTable createByteLut(float scale[],
192 float off[],
193 int nBands,
194 int nElems) {
195
196 byte[][] lutData = new byte[scale.length][nElems];
197
198 for (int band=0; band<scale.length; band++) {
199 float bandScale = scale[band];
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125 * @param hints the specified <code>RenderingHints</code>, or
126 * <code>null</code>
127 */
128 public RescaleOp (float scaleFactor, float offset, RenderingHints hints) {
129 length = 1;
130 this.scaleFactors = new float[1];
131 this.offsets = new float[1];
132 this.scaleFactors[0] = scaleFactor;
133 this.offsets[0] = offset;
134 this.hints = hints;
135 }
136
137 /**
138 * Returns the scale factors in the given array. The array is also
139 * returned for convenience. If scaleFactors is null, a new array
140 * will be allocated.
141 * @param scaleFactors the array to contain the scale factors of
142 * this <code>RescaleOp</code>
143 * @return the scale factors of this <code>RescaleOp</code>.
144 */
145 public final float[] getScaleFactors (float scaleFactors[]) {
146 if (scaleFactors == null) {
147 return this.scaleFactors.clone();
148 }
149 System.arraycopy (this.scaleFactors, 0, scaleFactors, 0,
150 Math.min(this.scaleFactors.length,
151 scaleFactors.length));
152 return scaleFactors;
153 }
154
155 /**
156 * Returns the offsets in the given array. The array is also returned
157 * for convenience. If offsets is null, a new array
158 * will be allocated.
159 * @param offsets the array to contain the offsets of
160 * this <code>RescaleOp</code>
161 * @return the offsets of this <code>RescaleOp</code>.
162 */
163 public final float[] getOffsets(float offsets[]) {
164 if (offsets == null) {
165 return this.offsets.clone();
166 }
167
168 System.arraycopy (this.offsets, 0, offsets, 0,
169 Math.min(this.offsets.length, offsets.length));
170 return offsets;
171 }
172
173 /**
174 * Returns the number of scaling factors and offsets used in this
175 * RescaleOp.
176 * @return the number of scaling factors and offsets of this
177 * <code>RescaleOp</code>.
178 */
179 public final int getNumFactors() {
180 return length;
181 }
182
183
184 /**
185 * Creates a ByteLookupTable to implement the rescale.
186 * The table may have either a SHORT or BYTE input.
187 * @param nElems Number of elements the table is to have.
188 * This will generally be 256 for byte and
189 * 65536 for short.
190 */
191 private ByteLookupTable createByteLut(float scale[],
192 float off[],
193 int nBands,
194 int nElems) {
195
196 byte[][] lutData = new byte[scale.length][nElems];
197
198 for (int band=0; band<scale.length; band++) {
199 float bandScale = scale[band];
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