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16 | |
16 | |
17 | mat3x3 () |
17 | mat3x3 () |
18 | { |
18 | { |
19 | } |
19 | } |
20 | |
20 | |
21 | mat3x3 (nv matrix[3][3]) |
21 | mat3x3 (const nv *matrix) |
22 | { |
22 | { |
23 | memcpy (v, matrix, sizeof (v)); |
23 | memcpy (v, matrix, sizeof (v)); |
24 | } |
24 | } |
25 | |
25 | |
26 | mat3x3 (nv v11, nv v12, nv v13, nv v21, nv v22, nv v23, nv v31, nv v32, nv v33) |
26 | mat3x3 (nv v11, nv v12, nv v13, nv v21, nv v22, nv v23, nv v31, nv v32, nv v33) |
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33 | mat3x3 invert (); |
33 | mat3x3 invert (); |
34 | |
34 | |
35 | nv *operator [](int i) { return &v[i][0]; } |
35 | nv *operator [](int i) { return &v[i][0]; } |
36 | const nv *operator [](int i) const { return &v[i][0]; } |
36 | const nv *operator [](int i) const { return &v[i][0]; } |
37 | |
37 | |
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38 | operator const nv * () const { return &v[0][0]; } |
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39 | operator nv * () { return &v[0][0]; } |
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40 | |
38 | // quite inefficient, hopefully gcc pulls the w calc out of any loops |
41 | // quite inefficient, hopefully gcc pulls the w calc out of any loops |
39 | nv apply1 (int i, nv x, nv y) |
42 | nv apply1 (int i, nv x, nv y) |
40 | { |
43 | { |
41 | mat3x3 &m = *this; |
44 | mat3x3 &m = *this; |
42 | |
45 | |
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45 | |
48 | |
46 | return v * (1. / w); |
49 | return v * (1. / w); |
47 | } |
50 | } |
48 | |
51 | |
49 | static mat3x3 translate (nv x, nv y); |
52 | static mat3x3 translate (nv x, nv y); |
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53 | static mat3x3 scale (nv s, nv t); |
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54 | static mat3x3 rotate (nv phi); |
50 | }; |
55 | }; |
51 | |
56 | |
52 | mat3x3 |
57 | mat3x3 |
53 | mat3x3::invert () |
58 | mat3x3::invert () |
54 | { |
59 | { |
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95 | { |
100 | { |
96 | return mat3x3 ( |
101 | return mat3x3 ( |
97 | 1, 0, x, |
102 | 1, 0, x, |
98 | 0, 1, y, |
103 | 0, 1, y, |
99 | 0, 0, 1 |
104 | 0, 0, 1 |
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105 | ); |
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106 | } |
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107 | |
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108 | mat3x3 |
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109 | mat3x3::scale (nv s, nv t) |
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110 | { |
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111 | return mat3x3 ( |
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112 | s, 0, 0, |
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113 | 0, t, 0, |
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114 | 0, 0, 1 |
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115 | ); |
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116 | } |
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117 | |
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118 | // clockwise |
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119 | mat3x3 |
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120 | mat3x3::rotate (nv phi) |
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121 | { |
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122 | nv s = sin (phi); |
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123 | nv c = cos (phi); |
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124 | |
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125 | return mat3x3 ( |
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126 | c, -s, 0, |
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127 | s, c, 0, |
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128 | 0, 0, 1 |
100 | ); |
129 | ); |
101 | } |
130 | } |
102 | |
131 | |
103 | } |
132 | } |
104 | |
133 | |
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694 | |
723 | |
695 | return img; |
724 | return img; |
696 | } |
725 | } |
697 | |
726 | |
698 | rxvt_img * |
727 | rxvt_img * |
699 | rxvt_img::transform (nv matrix[3][3]) |
728 | rxvt_img::transform (const nv matrix[3][3]) |
700 | { |
729 | { |
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730 | return transform (mat3x3 (&matrix[0][0])); |
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731 | } |
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732 | |
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733 | rxvt_img * |
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734 | rxvt_img::transform (const nv *matrix) |
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735 | { |
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736 | mat3x3 m (matrix); |
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737 | |
701 | // calculate new pixel bounding box coordinates |
738 | // calculate new pixel bounding box coordinates |
702 | nv r[2], rmin[2], rmax[2]; |
739 | nv r[2], rmin[2], rmax[2]; |
703 | |
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704 | mat3x3 m (matrix); |
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705 | |
740 | |
706 | for (int i = 0; i < 2; ++i) |
741 | for (int i = 0; i < 2; ++i) |
707 | { |
742 | { |
708 | nv v; |
743 | nv v; |
709 | |
744 | |
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754 | rxvt_img::scale (int new_width, int new_height) |
789 | rxvt_img::scale (int new_width, int new_height) |
755 | { |
790 | { |
756 | if (w == new_width && h == new_height) |
791 | if (w == new_width && h == new_height) |
757 | return clone (); |
792 | return clone (); |
758 | |
793 | |
759 | nv matrix[3][3] = { |
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760 | { new_width / (nv)w, 0, 0 }, |
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761 | { 0, new_height / (nv)h, 0 }, |
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762 | { 0, 0, 1 } |
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763 | }; |
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764 | |
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765 | int old_repeat_mode = repeat; |
794 | int old_repeat_mode = repeat; |
766 | repeat = RepeatPad; // not right, but xrender can't properly scale it seems |
795 | repeat = RepeatPad; // not right, but xrender can't properly scale it seems |
767 | |
796 | |
768 | rxvt_img *img = transform (matrix); |
797 | rxvt_img *img = transform (mat3x3::scale (new_width / (nv)w, new_height / (nv)h)); |
769 | |
798 | |
770 | repeat = old_repeat_mode; |
799 | repeat = old_repeat_mode; |
771 | img->repeat = repeat; |
800 | img->repeat = repeat; |
772 | |
801 | |
773 | return img; |
802 | return img; |
774 | } |
803 | } |
775 | |
804 | |
776 | rxvt_img * |
805 | rxvt_img * |
777 | rxvt_img::rotate (int cx, int cy, nv phi) |
806 | rxvt_img::rotate (int cx, int cy, nv phi) |
778 | { |
807 | { |
779 | nv s = sin (phi); |
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780 | nv c = cos (phi); |
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781 | |
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782 | nv matrix[3][3] = { |
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783 | #if 0 |
808 | #if 0 |
784 | { c, -s, cx - c * cx + s * cy }, |
809 | { c, -s, cx - c * cx + s * cy }, |
785 | { s, c, cy - s * cx - c * cy }, |
810 | { s, c, cy - s * cx - c * cy }, |
786 | { 0, 0, 1 } |
811 | { 0, 0, 1 } |
787 | #else |
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788 | { c, -s, 0 }, |
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789 | { s, c, 0 }, |
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790 | { 0, 0, 1 } |
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791 | #endif |
812 | #endif |
792 | }; |
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793 | |
813 | |
794 | move (-cx, -cy); |
814 | move (-cx, -cy); |
795 | rxvt_img *img = transform (matrix); |
815 | rxvt_img *img = transform (mat3x3::rotate (phi)); |
796 | move ( cx, cy); |
816 | move ( cx, cy); |
797 | img->move (cx, cy); |
817 | img->move (cx, cy); |
798 | |
818 | |
799 | return img; |
819 | return img; |
800 | } |
820 | } |