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/*
* Copyright 2013, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor:
* Sergey Sharybin
*/
#include "COM_PlaneTrackWarpImageOperation.h"
#include "COM_ReadBufferOperation.h"
#include "MEM_guardedalloc.h"
#include "BLI_listbase.h"
#include "BLI_math.h"
#include "BLI_math_color.h"
extern "C" {
#include "BLI_jitter.h"
#include "BKE_movieclip.h"
#include "BKE_node.h"
#include "BKE_tracking.h"
}
BLI_INLINE bool isPointInsideQuad(const float x, const float y, const float corners[4][2])
{
float point[2];
point[0] = x;
point[1] = y;
return isect_point_tri_v2(point, corners[0], corners[1], corners[2]) ||
isect_point_tri_v2(point, corners[0], corners[2], corners[3]);
}
BLI_INLINE bool resolveUV(const float x, const float y, const float corners[4][2], float uv[2])
{
float point[2];
bool inside;
inside = isPointInsideQuad(x, y, corners);
point[0] = x;
point[1] = y;
/* Use reverse bilinear to get UV coordinates within original frame */
resolve_quad_uv(uv, point, corners[0], corners[1], corners[2], corners[3]);
return inside;
}
BLI_INLINE void resolveUVAndDxDy(const float x, const float y, const float corners[4][2],
float *u_r, float *v_r, float *dx_r, float *dy_r)
{
float inputUV[2];
float uv_a[2], uv_b[2];
float dx, dy;
float uv_l, uv_r;
float uv_u, uv_d;
bool ok1, ok2;
resolveUV(x, y, corners, inputUV);
/* adaptive sampling, red (U) channel */
ok1 = resolveUV(x - 1, y, corners, uv_a);
ok2 = resolveUV(x + 1, y, corners, uv_b);
uv_l = ok1 ? fabsf(inputUV[0] - uv_a[0]) : 0.0f;
uv_r = ok2 ? fabsf(inputUV[0] - uv_b[0]) : 0.0f;
dx = 0.5f * (uv_l + uv_r);
/* adaptive sampling, green (V) channel */
ok1 = resolveUV(x, y - 1, corners, uv_a);
ok2 = resolveUV(x, y + 1, corners, uv_b);
uv_u = ok1 ? fabsf(inputUV[1] - uv_a[1]) : 0.f;
uv_d = ok2 ? fabsf(inputUV[1] - uv_b[1]) : 0.f;
dy = 0.5f * (uv_u + uv_d);
*dx_r = dx;
*dy_r = dy;
*u_r = inputUV[0];
*v_r = inputUV[1];
}
PlaneTrackWarpImageOperation::PlaneTrackWarpImageOperation() : PlaneTrackCommonOperation()
{
this->addInputSocket(COM_DT_COLOR, COM_SC_NO_RESIZE);
this->addOutputSocket(COM_DT_COLOR);
this->m_pixelReader = NULL;
this->setComplex(true);
/* Currently hardcoded to 8 samples. */
this->m_osa = 8;
}
void PlaneTrackWarpImageOperation::initExecution()
{
PlaneTrackCommonOperation::initExecution();
this->m_pixelReader = this->getInputSocketReader(0);
BLI_jitter_init(this->m_jitter[0], this->m_osa);
}
void PlaneTrackWarpImageOperation::deinitExecution()
{
this->m_pixelReader = NULL;
}
void PlaneTrackWarpImageOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
{
float color_accum[4];
zero_v4(color_accum);
for (int sample = 0; sample < this->m_osa; sample++) {
float current_x = x + this->m_jitter[sample][0],
current_y = y + this->m_jitter[sample][1];
if (isPointInsideQuad(current_x, current_y, this->m_frameSpaceCorners)) {
float current_color[4];
float u, v, dx, dy;
resolveUVAndDxDy(current_x, current_y, this->m_frameSpaceCorners, &u, &v, &dx, &dy);
u *= this->m_pixelReader->getWidth();
v *= this->m_pixelReader->getHeight();
this->m_pixelReader->readFiltered(current_color, u, v, dx, dy, COM_PS_NEAREST);
add_v4_v4(color_accum, current_color);
}
}
mul_v4_v4fl(output, color_accum, 1.0f / this->m_osa);
}
bool PlaneTrackWarpImageOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
{
float frame_space_corners[4][2];
for (int i = 0; i < 4; i++) {
frame_space_corners[i][0] = this->m_corners[i][0] * this->getWidth();
frame_space_corners[i][1] = this->m_corners[i][1] * this->getHeight();
}
float UVs[4][2];
/* TODO(sergey): figure out proper way to do this. */
resolveUV(input->xmin - 2, input->ymin - 2, frame_space_corners, UVs[0]);
resolveUV(input->xmax + 2, input->ymin - 2, frame_space_corners, UVs[1]);
resolveUV(input->xmax + 2, input->ymax + 2, frame_space_corners, UVs[2]);
resolveUV(input->xmin - 2, input->ymax + 2, frame_space_corners, UVs[3]);
float min[2], max[2];
INIT_MINMAX2(min, max);
for (int i = 0; i < 4; i++) {
minmax_v2v2_v2(min, max, UVs[i]);
}
rcti newInput;
newInput.xmin = min[0] * readOperation->getWidth() - 1;
newInput.ymin = min[1] * readOperation->getHeight() - 1;
newInput.xmax = max[0] * readOperation->getWidth() + 1;
newInput.ymax = max[1] * readOperation->getHeight() + 1;
return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
}
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