src/share/classes/sun/java2d/pipe/Region.java

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*** 129,138 **** --- 129,160 ---- newv = (dv < 0) ? Integer.MIN_VALUE : Integer.MAX_VALUE; } return newv; } + /** + * Multiply the scale factor {@code sv} and the value {@code v} with + * appropriate clipping to the bounds of Integer resolution. If the answer + * would be greater than {@code Integer.MAX_VALUE} then {@code + * Integer.MAX_VALUE} is returned. If the answer would be less than {@code + * Integer.MIN_VALUE} then {@code Integer.MIN_VALUE} is returned. Otherwise + * the multiplication is returned. + */ + public static int clipScale(final int v, final double sv) { + if (sv == 1.0) { + return v; + } + final double newv = v * sv; + if (newv < Integer.MIN_VALUE) { + return Integer.MIN_VALUE; + } + if (newv > Integer.MAX_VALUE) { + return Integer.MAX_VALUE; + } + return (int) Math.floor(newv + 0.5); + } + protected Region(int lox, int loy, int hix, int hiy) { this.lox = lox; this.loy = loy; this.hix = hix; this.hiy = hiy;
*** 347,356 **** --- 369,451 ---- endRow(box); calcBBox(); } /** + * Returns a Region object that represents the same list of rectangles as + * the current Region object, scaled by the specified sx, sy factors. + */ + public Region getScaledRegion(final double sx, final double sy) { + if (sx == 0 || sy == 0 || this == EMPTY_REGION) { + return EMPTY_REGION; + } + if ((sx == 1.0 && sy == 1.0) || (this == WHOLE_REGION)) { + return this; + } + + int tlox = clipScale(lox, sx); + int tloy = clipScale(loy, sy); + int thix = clipScale(hix, sx); + int thiy = clipScale(hiy, sy); + Region ret = new Region(tlox, tloy, thix, thiy); + int bands[] = this.bands; + if (bands != null) { + int end = endIndex; + int newbands[] = new int[end]; + int i = 0; // index for source bands + int j = 0; // index for translated newbands + int ncol; + while (i < end) { + int y1, y2; + newbands[j++] = y1 = clipScale(bands[i++], sy); + newbands[j++] = y2 = clipScale(bands[i++], sy); + newbands[j++] = ncol = bands[i++]; + int savej = j; + if (y1 < y2) { + while (--ncol >= 0) { + int x1 = clipScale(bands[i++], sx); + int x2 = clipScale(bands[i++], sx); + if (x1 < x2) { + newbands[j++] = x1; + newbands[j++] = x2; + } + } + } else { + i += ncol * 2; + } + // Did we get any non-empty bands in this row? + if (j > savej) { + newbands[savej-1] = (j - savej) / 2; + } else { + j = savej - 3; + } + } + if (j <= 5) { + if (j < 5) { + // No rows or bands were generated... + ret.lox = ret.loy = ret.hix = ret.hiy = 0; + } else { + // Only generated one single rect in the end... + ret.loy = newbands[0]; + ret.hiy = newbands[1]; + ret.lox = newbands[3]; + ret.hix = newbands[4]; + } + // ret.endIndex and ret.bands were never initialized... + // ret.endIndex = 0; + // ret.newbands = null; + } else { + // Generated multiple bands and/or multiple rows... + ret.endIndex = j; + ret.bands = newbands; + } + } + return ret; + } + + + /** * Returns a Region object that represents the same list of * rectangles as the current Region object, translated by * the specified dx, dy translation factors. */ public Region getTranslatedRegion(int dx, int dy) {