Returns pointer to first scalar in Rect, to treat it as an array with four entries. @return pointer to fLeft */

Returns bottom edge of Rect, if sorted. Call isEmpty() to see if Rect may be invalid, and sort() to reverse fTop and fBottom if needed.

Returns average of left edge and right edge. Result does not change if Rect is sorted. Result may overflow to infinity if Rect is far from the

Returns average of top edge and bottom edge. Result does not change if Rect is sorted. @return midpoint in y */

Returns true if Matrix equals m, using an efficient comparison. Returns false when the sign of zero values is the different; when one

Returns true if: fLeft <= x < fRight && fTop <= y < fBottom. Returns false if Rect is empty. @param x test Point x-coordinate

* @brief visit device memory. * @return device data ID. what the ID means varies between backends. */

Sets internal cache to unknown state. Use to force update after repeated modifications to Matrix element reference returned by operator[](int

* @brief calculate number of elements needed to store data taking reordering flag into account. * @return elements needed to store data */

* 数字格式化 * @param pattern 格式 * 例"#.000000" 保留6位小数 * @return 返回格式化后的字符串 */

* 数字格式化 * @param pattern 格式 * 例"#.000000" 保留6位小数 * @return 返回格式化后的字符串 */

* 数字格式化 * @param pattern 格式 * 例"#.000000" 保留6位小数 * @return 返回格式化后的字符串 */

Returns one matrix value. Asserts if index is out of range and SK_DEBUG is defined. @param index one of: kMScaleX, kMSkewX, kMTransX

Copies nine scalar values contained by Matrix into buffer, in member value ascending order: kMScaleX, kMSkewX, kMTransX, kMSkewY, kMScaleY, kM