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BLI_rect: Function to calculate a matrix from 2 rctf's

This commit is contained in:
Campbell Barton 2017-08-27 16:01:06 +10:00
parent b1f2b69884
commit c90452e111
2 changed files with 40 additions and 0 deletions
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2
source/blender/blenlib/BLI_rect.h
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@ -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);

38
source/blender/blenlib/intern/rct.c
View File

@ -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;
}