diff options
-rw-r--r-- | source/blender/blenlib/BLI_rect.h | 2 | ||||
-rw-r--r-- | source/blender/blenlib/intern/rct.c | 38 |
2 files changed, 40 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_rect.h b/source/blender/blenlib/BLI_rect.h index 21b9c75ac35..471d875c9af 100644 --- a/source/blender/blenlib/BLI_rect.h +++ b/source/blender/blenlib/BLI_rect.h @@ -55,6 +55,8 @@ void BLI_rcti_do_minmax_v(struct rcti *rect, const int xy[2]); void BLI_rctf_do_minmax_v(struct rctf *rect, const float xy[2]); void BLI_rctf_transform_pt_v(const rctf *dst, const rctf *src, float xy_dst[2], const float xy_src[2]); +void BLI_rctf_transform_calc_m4_pivot_min_ex(const rctf *dst, const rctf *src, float matrix[4][4], uint x, uint y); +void BLI_rctf_transform_calc_m4_pivot_min(const rctf *dst, const rctf *src, float matrix[4][4]); void BLI_rctf_translate(struct rctf *rect, float x, float y); void BLI_rcti_translate(struct rcti *rect, int x, int y); diff --git a/source/blender/blenlib/intern/rct.c b/source/blender/blenlib/intern/rct.c index e0c4cbe9990..3adc6b30f6e 100644 --- a/source/blender/blenlib/intern/rct.c +++ b/source/blender/blenlib/intern/rct.c @@ -32,6 +32,7 @@ * A minimalist lib for functions doing stuff with rectangle structs. */ +#include <stdlib.h> #include <stdio.h> #include <math.h> @@ -41,6 +42,9 @@ #include "DNA_vec_types.h" #include "BLI_rect.h" +/* avoid including BLI_math */ +static void unit_m4(float m[4][4]); + /** * Determine if a rect is empty. An empty * rect is one with a zero (or negative) @@ -405,6 +409,31 @@ void BLI_rctf_transform_pt_v(const rctf *dst, const rctf *src, float xy_dst[2], xy_dst[1] = dst->ymin + ((dst->ymax - dst->ymin) * xy_dst[1]); } +/** + * Calculate a 4x4 matrix representing the transformation between two rectangles. + * + * \note Multiplying a vector by this matrix does *not* give the same value as #BLI_rctf_transform_pt_v. + */ +void BLI_rctf_transform_calc_m4_pivot_min_ex( + const rctf *dst, const rctf *src, float matrix[4][4], + uint x, uint y) +{ + BLI_assert(x < 3 && y < 3); + + unit_m4(matrix); + + matrix[x][x] = BLI_rctf_size_x(src) / BLI_rctf_size_x(dst); + matrix[y][y] = BLI_rctf_size_y(src) / BLI_rctf_size_y(dst); + matrix[3][x] = (src->xmin - dst->xmin) * matrix[x][x]; + matrix[3][y] = (src->ymin - dst->ymin) * matrix[y][y]; +} + +void BLI_rctf_transform_calc_m4_pivot_min( + const rctf *dst, const rctf *src, float matrix[4][4]) +{ + BLI_rctf_transform_calc_m4_pivot_min_ex(dst, src, matrix, 0, 1); +} + void BLI_rcti_translate(rcti *rect, int x, int y) { rect->xmin += x; @@ -763,3 +792,12 @@ void BLI_rctf_rotate_expand(rctf *dst, const rctf *src, const float angle) #undef ROTATE_SINCOS /** \} */ + +static void unit_m4(float m[4][4]) +{ + m[0][0] = m[1][1] = m[2][2] = m[3][3] = 1.0f; + m[0][1] = m[0][2] = m[0][3] = 0.0f; + m[1][0] = m[1][2] = m[1][3] = 0.0f; + m[2][0] = m[2][1] = m[2][3] = 0.0f; + m[3][0] = m[3][1] = m[3][2] = 0.0f; +} |