strip_transform.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 * SPDX-FileCopyrightText: 2003-2009 Blender Authors
 * SPDX-FileCopyrightText: 2005-2006 Peter Schlaile <peter [at] schlaile [dot] de>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_bounds.hh"
#include "BLI_math_base.hh"
#include "DNA_scene_types.h"
#include "DNA_sequence_types.h"
 
#include "BLI_listbase.h"
#include "BLI_math_base.h"
#include "BLI_math_matrix.hh"
#include "BLI_math_vector_types.hh"
 
#include "SEQ_animation.hh"
#include "SEQ_channels.hh"
#include "SEQ_edit.hh"
#include "SEQ_effects.hh"
#include "SEQ_iterator.hh"
#include "SEQ_relations.hh"
#include "SEQ_sequencer.hh"
#include "SEQ_time.hh"
#include "SEQ_transform.hh"
 
#include "sequencer.hh"
#include "strip_time.hh"
 
namespace blender::seq {
 
bool transform_single_image_check(const Strip *strip)
{
  return (strip->flag & SEQ_SINGLE_FRAME_CONTENT) != 0;
}
 
bool transform_strip_can_be_translated(const Strip *strip)
{
  return !(strip->type & STRIP_TYPE_EFFECT) || (effect_get_num_inputs(strip->type) == 0);
}
 
bool transform_test_overlap(const Scene *scene, Strip *strip1, Strip *strip2)
{
  return (
      strip1 != strip2 && strip1->channel == strip2->channel &&
      ((time_right_handle_frame_get(scene, strip1) <= time_left_handle_frame_get(scene, strip2)) ||
       (time_left_handle_frame_get(scene, strip1) >=
        time_right_handle_frame_get(scene, strip2))) == 0);
}
 
bool transform_test_overlap(const Scene *scene, ListBase *seqbasep, Strip *test)
{
  Strip *strip;
 
  strip = static_cast<Strip *>(seqbasep->first);
  while (strip) {
    if (transform_test_overlap(scene, test, strip)) {
      return true;
    }
 
    strip = strip->next;
  }
  return false;
}
 
void transform_translate_strip(Scene *evil_scene, Strip *strip, int delta)
{
  if (delta == 0) {
    return;
  }
 
  /* Meta strips requires their content is to be translated, and then frame range of the meta is
   * updated based on nested strips. This won't work for empty meta-strips,
   * so they can be treated as normal strip. */
  if (strip->type == STRIP_TYPE_META && !BLI_listbase_is_empty(&strip->seqbase)) {
    LISTBASE_FOREACH (Strip *, strip_child, &strip->seqbase) {
      transform_translate_strip(evil_scene, strip_child, delta);
    }
    /* Move meta start/end points. */
    strip_time_translate_handles(evil_scene, strip, delta);
  }
  else if (strip->input1 == nullptr && strip->input2 == nullptr) { /* All other strip types. */
    strip->start += delta;
    /* Only to make files usable in older versions. */
    strip->startdisp = time_left_handle_frame_get(evil_scene, strip);
    strip->enddisp = time_right_handle_frame_get(evil_scene, strip);
  }
 
  offset_animdata(evil_scene, strip, delta);
  blender::Span<Strip *> effects = SEQ_lookup_effects_by_strip(evil_scene->ed, strip);
  strip_time_update_effects_strip_range(evil_scene, effects);
  time_update_meta_strip_range(evil_scene, lookup_meta_by_strip(evil_scene->ed, strip));
}
 
bool transform_seqbase_shuffle_ex(ListBase *seqbasep,
                                  Strip *test,
                                  Scene *evil_scene,
                                  int channel_delta)
{
  const int orig_channel = test->channel;
  BLI_assert(ELEM(channel_delta, -1, 1));
 
  strip_channel_set(test, test->channel + channel_delta);
 
  const ListBase *channels = channels_displayed_get(editing_get(evil_scene));
  SeqTimelineChannel *channel = channel_get_by_index(channels, test->channel);
 
  while (transform_test_overlap(evil_scene, seqbasep, test) || channel_is_muted(channel) ||
         channel_is_locked(channel))
  {
    if ((channel_delta > 0) ? (test->channel >= MAX_CHANNELS) : (test->channel < 1)) {
      break;
    }
 
    strip_channel_set(test, test->channel + channel_delta);
    channel = channel_get_by_index(channels, test->channel);
  }
 
  if (!is_valid_strip_channel(test)) {
    /* Blender 2.4x would remove the strip.
     * nicer to move it to the end */
 
    int new_frame = time_right_handle_frame_get(evil_scene, test);
 
    LISTBASE_FOREACH (Strip *, strip, seqbasep) {
      if (strip->channel == orig_channel) {
        new_frame = max_ii(new_frame, time_right_handle_frame_get(evil_scene, strip));
      }
    }
 
    strip_channel_set(test, orig_channel);
 
    new_frame = new_frame + (test->start - time_left_handle_frame_get(
                                               evil_scene, test)); /* adjust by the startdisp */
    transform_translate_strip(evil_scene, test, new_frame - test->start);
    return false;
  }
 
  return true;
}
 
bool transform_seqbase_shuffle(ListBase *seqbasep, Strip *test, Scene *evil_scene)
{
  return transform_seqbase_shuffle_ex(seqbasep, test, evil_scene, 1);
}
 
static bool shuffle_strip_test_overlap(const Scene *scene,
                                       const Strip *strip1,
                                       const Strip *strip2,
                                       const int offset)
{
  BLI_assert(strip1 != strip2);
  return (strip1->channel == strip2->channel &&
          ((time_right_handle_frame_get(scene, strip1) + offset <=
            time_left_handle_frame_get(scene, strip2)) ||
           (time_left_handle_frame_get(scene, strip1) + offset >=
            time_right_handle_frame_get(scene, strip2))) == 0);
}
 
static int shuffle_strip_time_offset_get(const Scene *scene,
                                         blender::Span<Strip *> strips_to_shuffle,
                                         ListBase *seqbasep,
                                         char dir)
{
  int offset = 0;
  bool all_conflicts_resolved = false;
 
  while (!all_conflicts_resolved) {
    all_conflicts_resolved = true;
    for (Strip *strip : strips_to_shuffle) {
      LISTBASE_FOREACH (Strip *, strip_other, seqbasep) {
        if (strips_to_shuffle.contains(strip_other)) {
          continue;
        }
        if (relation_is_effect_of_strip(strip_other, strip)) {
          continue;
        }
        if (!shuffle_strip_test_overlap(scene, strip, strip_other, offset)) {
          continue;
        }
 
        all_conflicts_resolved = false;
 
        if (dir == 'L') {
          offset = min_ii(offset,
                          time_left_handle_frame_get(scene, strip_other) -
                              time_right_handle_frame_get(scene, strip));
        }
        else {
          offset = max_ii(offset,
                          time_right_handle_frame_get(scene, strip_other) -
                              time_left_handle_frame_get(scene, strip));
        }
      }
    }
  }
 
  return offset;
}
 
bool transform_seqbase_shuffle_time(blender::Span<Strip *> strips_to_shuffle,
                                    ListBase *seqbasep,
                                    Scene *evil_scene,
                                    ListBase *markers,
                                    const bool use_sync_markers)
{
  blender::VectorSet<Strip *> empty_set;
  return transform_seqbase_shuffle_time(
      strips_to_shuffle, empty_set, seqbasep, evil_scene, markers, use_sync_markers);
}
 
bool transform_seqbase_shuffle_time(blender::Span<Strip *> strips_to_shuffle,
                                    blender::Span<Strip *> time_dependent_strips,
                                    ListBase *seqbasep,
                                    Scene *evil_scene,
                                    ListBase *markers,
                                    const bool use_sync_markers)
{
  int offset_l = shuffle_strip_time_offset_get(evil_scene, strips_to_shuffle, seqbasep, 'L');
  int offset_r = shuffle_strip_time_offset_get(evil_scene, strips_to_shuffle, seqbasep, 'R');
  int offset = (-offset_l < offset_r) ? offset_l : offset_r;
 
  if (offset) {
    for (Strip *strip : strips_to_shuffle) {
      transform_translate_strip(evil_scene, strip, offset);
      strip->flag &= ~SEQ_OVERLAP;
    }
 
    if (!time_dependent_strips.is_empty()) {
      for (Strip *strip : time_dependent_strips) {
        offset_animdata(evil_scene, strip, offset);
      }
    }
 
    if (use_sync_markers && !(evil_scene->toolsettings->lock_markers) && (markers != nullptr)) {
      /* affect selected markers - it's unlikely that we will want to affect all in this way? */
      LISTBASE_FOREACH (TimeMarker *, marker, markers) {
        if (marker->flag & SELECT) {
          marker->frame += offset;
        }
      }
    }
  }
 
  return offset ? false : true;
}
 
static blender::VectorSet<Strip *> extract_standalone_strips(
    blender::Span<Strip *> transformed_strips)
{
  blender::VectorSet<Strip *> standalone_strips;
 
  for (Strip *strip : transformed_strips) {
    if ((strip->type & STRIP_TYPE_EFFECT) == 0 || strip->input1 == nullptr) {
      standalone_strips.add(strip);
    }
  }
  return standalone_strips;
}
 
/* Query strips positioned after left edge of transformed strips bound-box. */
static blender::VectorSet<Strip *> query_right_side_strips(
    const Scene *scene,
    ListBase *seqbase,
    blender::Span<Strip *> transformed_strips,
    blender::Span<Strip *> time_dependent_strips)
{
  int minframe = MAXFRAME;
  {
    for (Strip *strip : transformed_strips) {
      minframe = min_ii(minframe, time_left_handle_frame_get(scene, strip));
    }
  }
 
  blender::VectorSet<Strip *> right_side_strips;
  LISTBASE_FOREACH (Strip *, strip, seqbase) {
    if (!time_dependent_strips.is_empty() && time_dependent_strips.contains(strip)) {
      continue;
    }
    if (transformed_strips.contains(strip)) {
      continue;
    }
 
    if ((strip->flag & SELECT) == 0 && time_left_handle_frame_get(scene, strip) >= minframe) {
      right_side_strips.add(strip);
    }
  }
  return right_side_strips;
}
 
/* Offset all strips positioned after left edge of transformed strips bound-box by amount equal
 * to overlap of transformed strips. */
static void strip_transform_handle_expand_to_fit(Scene *scene,
                                                 ListBase *seqbasep,
                                                 blender::Span<Strip *> transformed_strips,
                                                 blender::Span<Strip *> time_dependent_strips,
                                                 bool use_sync_markers)
{
  ListBase *markers = &scene->markers;
 
  blender::VectorSet right_side_strips = query_right_side_strips(
      scene, seqbasep, transformed_strips, time_dependent_strips);
 
  /* Temporarily move right side strips beyond timeline boundary. */
  for (Strip *strip : right_side_strips) {
    strip->channel += MAX_CHANNELS * 2;
  }
 
  /* Shuffle transformed standalone strips. This is because transformed strips can overlap with
   * strips on left side. */
  blender::VectorSet standalone_strips = extract_standalone_strips(transformed_strips);
  transform_seqbase_shuffle_time(
      standalone_strips, time_dependent_strips, seqbasep, scene, markers, use_sync_markers);
 
  /* Move temporarily moved strips back to their original place and tag for shuffling. */
  for (Strip *strip : right_side_strips) {
    strip->channel -= MAX_CHANNELS * 2;
  }
  /* Shuffle again to displace strips on right side. Final effect shuffling is done in
   * SEQ_transform_handle_overlap. */
  transform_seqbase_shuffle_time(right_side_strips, seqbasep, scene, markers, use_sync_markers);
}
 
static blender::VectorSet<Strip *> query_overwrite_targets(
    const Scene *scene, ListBase *seqbasep, blender::Span<Strip *> transformed_strips)
{
  blender::VectorSet<Strip *> overwrite_targets = query_unselected_strips(seqbasep);
 
  /* Effects of transformed strips can be unselected. These must not be included. */
  overwrite_targets.remove_if([&](Strip *strip) { return transformed_strips.contains(strip); });
  overwrite_targets.remove_if([&](Strip *strip) {
    bool does_overlap = false;
    for (Strip *strip_transformed : transformed_strips) {
      if (transform_test_overlap(scene, strip, strip_transformed)) {
        does_overlap = true;
      }
    }
 
    return !does_overlap;
  });
 
  return overwrite_targets;
}
 
enum eOvelapDescrition {
  /* No overlap. */
  STRIP_OVERLAP_NONE,
  /* Overlapping strip covers overlapped completely. */
  STRIP_OVERLAP_IS_FULL,
  /* Overlapping strip is inside overlapped. */
  STRIP_OVERLAP_IS_INSIDE,
  /* Partial overlap between 2 strips. */
  STRIP_OVERLAP_LEFT_SIDE,
  STRIP_OVERLAP_RIGHT_SIDE,
};
 
static eOvelapDescrition overlap_description_get(const Scene *scene,
                                                 const Strip *transformed,
                                                 const Strip *target)
{
  if (time_left_handle_frame_get(scene, transformed) <=
          time_left_handle_frame_get(scene, target) &&
      time_right_handle_frame_get(scene, transformed) >=
          time_right_handle_frame_get(scene, target))
  {
    return STRIP_OVERLAP_IS_FULL;
  }
  if (time_left_handle_frame_get(scene, transformed) > time_left_handle_frame_get(scene, target) &&
      time_right_handle_frame_get(scene, transformed) < time_right_handle_frame_get(scene, target))
  {
    return STRIP_OVERLAP_IS_INSIDE;
  }
  if (time_left_handle_frame_get(scene, transformed) <=
          time_left_handle_frame_get(scene, target) &&
      time_left_handle_frame_get(scene, target) <= time_right_handle_frame_get(scene, transformed))
  {
    return STRIP_OVERLAP_LEFT_SIDE;
  }
  if (time_left_handle_frame_get(scene, transformed) <=
          time_right_handle_frame_get(scene, target) &&
      time_right_handle_frame_get(scene, target) <=
          time_right_handle_frame_get(scene, transformed))
  {
    return STRIP_OVERLAP_RIGHT_SIDE;
  }
  return STRIP_OVERLAP_NONE;
}
 
/* Split strip in 3 parts, remove middle part and fit transformed inside. */
static void strip_transform_handle_overwrite_split(Scene *scene,
                                                   ListBase *seqbasep,
                                                   const Strip *transformed,
                                                   Strip *target)
{
  /* Because we are doing a soft split, bmain is not used in SEQ_edit_strip_split, so we can
   * pass nullptr here. */
  Main *bmain = nullptr;
 
  Strip *split_strip = edit_strip_split(bmain,
                                        scene,
                                        seqbasep,
                                        target,
                                        time_left_handle_frame_get(scene, transformed),
                                        SPLIT_SOFT,
                                        true,
                                        nullptr);
  edit_strip_split(bmain,
                   scene,
                   seqbasep,
                   split_strip,
                   time_right_handle_frame_get(scene, transformed),
                   SPLIT_SOFT,
                   true,
                   nullptr);
  edit_flag_for_removal(scene, seqbasep, split_strip);
  edit_remove_flagged_strips(scene, seqbasep);
}
 
/* Trim strips by adjusting handle position.
 * This is bit more complicated in case overlap happens on effect. */
static void strip_transform_handle_overwrite_trim(Scene *scene,
                                                  ListBase *seqbasep,
                                                  const Strip *transformed,
                                                  Strip *target,
                                                  const eOvelapDescrition overlap)
{
  blender::VectorSet targets = query_by_reference(
      target, scene, seqbasep, query_strip_effect_chain);
 
  /* Expand collection by adding all target's children, effects and their children. */
  if ((target->type & STRIP_TYPE_EFFECT) != 0) {
    iterator_set_expand(scene, seqbasep, targets, query_strip_effect_chain);
  }
 
  /* Trim all non effects, that have influence on effect length which is overlapping. */
  for (Strip *strip : targets) {
    if ((strip->type & STRIP_TYPE_EFFECT) != 0 && effect_get_num_inputs(strip->type) > 0) {
      continue;
    }
    if (overlap == STRIP_OVERLAP_LEFT_SIDE) {
      time_left_handle_frame_set(scene, strip, time_right_handle_frame_get(scene, transformed));
    }
    else {
      BLI_assert(overlap == STRIP_OVERLAP_RIGHT_SIDE);
      time_right_handle_frame_set(scene, strip, time_left_handle_frame_get(scene, transformed));
    }
  }
}
 
static void strip_transform_handle_overwrite(Scene *scene,
                                             ListBase *seqbasep,
                                             blender::Span<Strip *> transformed_strips)
{
  blender::VectorSet targets = query_overwrite_targets(scene, seqbasep, transformed_strips);
  blender::VectorSet<Strip *> strips_to_delete;
 
  for (Strip *target : targets) {
    for (Strip *transformed : transformed_strips) {
      if (transformed->channel != target->channel) {
        continue;
      }
 
      const eOvelapDescrition overlap = overlap_description_get(scene, transformed, target);
 
      if (overlap == STRIP_OVERLAP_IS_FULL) {
        strips_to_delete.add(target);
      }
      else if (overlap == STRIP_OVERLAP_IS_INSIDE) {
        strip_transform_handle_overwrite_split(scene, seqbasep, transformed, target);
      }
      else if (ELEM(overlap, STRIP_OVERLAP_LEFT_SIDE, STRIP_OVERLAP_RIGHT_SIDE)) {
        strip_transform_handle_overwrite_trim(scene, seqbasep, transformed, target, overlap);
      }
    }
  }
 
  /* Remove covered strips. This must be done in separate loop, because
   * `SEQ_edit_strip_split()` also uses `SEQ_edit_remove_flagged_sequences()`. See #91096. */
  if (!strips_to_delete.is_empty()) {
    for (Strip *strip : strips_to_delete) {
      edit_flag_for_removal(scene, seqbasep, strip);
    }
    edit_remove_flagged_strips(scene, seqbasep);
  }
}
 
static void strip_transform_handle_overlap_shuffle(Scene *scene,
                                                   ListBase *seqbasep,
                                                   blender::Span<Strip *> transformed_strips,
                                                   blender::Span<Strip *> time_dependent_strips,
                                                   bool use_sync_markers)
{
  ListBase *markers = &scene->markers;
 
  /* Shuffle non strips with no effects attached. */
  blender::VectorSet standalone_strips = extract_standalone_strips(transformed_strips);
  transform_seqbase_shuffle_time(
      standalone_strips, time_dependent_strips, seqbasep, scene, markers, use_sync_markers);
}
 
void transform_handle_overlap(Scene *scene,
                              ListBase *seqbasep,
                              blender::Span<Strip *> transformed_strips,
                              bool use_sync_markers)
{
  blender::VectorSet<Strip *> empty_set;
  transform_handle_overlap(scene, seqbasep, transformed_strips, empty_set, use_sync_markers);
}
 
void transform_handle_overlap(Scene *scene,
                              ListBase *seqbasep,
                              blender::Span<Strip *> transformed_strips,
                              blender::Span<Strip *> time_dependent_strips,
                              bool use_sync_markers)
{
  const eSeqOverlapMode overlap_mode = tool_settings_overlap_mode_get(scene);
 
  switch (overlap_mode) {
    case SEQ_OVERLAP_EXPAND:
      strip_transform_handle_expand_to_fit(
          scene, seqbasep, transformed_strips, time_dependent_strips, use_sync_markers);
      break;
    case SEQ_OVERLAP_OVERWRITE:
      strip_transform_handle_overwrite(scene, seqbasep, transformed_strips);
      break;
    case SEQ_OVERLAP_SHUFFLE:
      strip_transform_handle_overlap_shuffle(
          scene, seqbasep, transformed_strips, time_dependent_strips, use_sync_markers);
      break;
  }
 
  /* If any effects still overlap, we need to move them up.
   * In some cases other strips can be overlapping still, see #90646. */
  for (Strip *strip : transformed_strips) {
    if (transform_test_overlap(scene, seqbasep, strip)) {
      transform_seqbase_shuffle(seqbasep, strip, scene);
    }
    strip->flag &= ~SEQ_OVERLAP;
  }
}
 
void transform_offset_after_frame(Scene *scene,
                                  ListBase *seqbase,
                                  const int delta,
                                  const int timeline_frame)
{
  LISTBASE_FOREACH (Strip *, strip, seqbase) {
    if (time_left_handle_frame_get(scene, strip) >= timeline_frame) {
      transform_translate_strip(scene, strip, delta);
      relations_invalidate_cache(scene, strip);
    }
  }
 
  if (!scene->toolsettings->lock_markers) {
    LISTBASE_FOREACH (TimeMarker *, marker, &scene->markers) {
      if (marker->frame >= timeline_frame) {
        marker->frame += delta;
      }
    }
  }
}
 
void strip_channel_set(Strip *strip, int channel)
{
  strip->channel = math::clamp(channel, 1, MAX_CHANNELS);
}
 
bool transform_is_locked(ListBase *channels, const Strip *strip)
{
  const SeqTimelineChannel *channel = channel_get_by_index(channels, strip->channel);
  return strip->flag & SEQ_LOCK ||
         (channel_is_locked(channel) && ((strip->flag & SEQ_IGNORE_CHANNEL_LOCK) == 0));
}
 
float2 image_transform_mirror_factor_get(const Strip *strip)
{
  float2 mirror(1.0f, 1.0f);
 
  if ((strip->flag & SEQ_FLIPX) != 0) {
    mirror.x = -1.0f;
  }
  if ((strip->flag & SEQ_FLIPY) != 0) {
    mirror.y = -1.0f;
  }
  return mirror;
}
 
static float2 strip_raw_image_size_get(const Scene *scene, const Strip *strip)
{
  if (ELEM(strip->type, STRIP_TYPE_MOVIE, STRIP_TYPE_IMAGE)) {
    const StripElem *selem = strip->data->stripdata;
    return {float(selem->orig_width), float(selem->orig_height)};
  }
 
  if (strip->type == STRIP_TYPE_MOVIECLIP) {
    const MovieClip *clip = strip->clip;
    if (clip != nullptr && clip->lastsize[0] != 0 && clip->lastsize[1] != 0) {
      return {float(clip->lastsize[0]), float(clip->lastsize[1])};
    }
  }
 
  return {float(scene->r.xsch), float(scene->r.ysch)};
}
 
float2 image_transform_origin_offset_pixelspace_get(const Scene *scene, const Strip *strip)
{
  const float2 image_size = strip_raw_image_size_get(scene, strip);
  const StripTransform *transform = strip->data->transform;
 
  const float2 origin(
      (image_size[0] * transform->origin[0]) - (image_size[0] * 0.5f) + transform->xofs,
      (image_size[1] * transform->origin[1]) - (image_size[1] * 0.5f) + transform->yofs);
 
  const float2 viewport_pixel_aspect(scene->r.xasp / scene->r.yasp, 1.0f);
  const float2 mirror = image_transform_mirror_factor_get(strip);
 
  return origin * mirror * viewport_pixel_aspect;
}
 
static float3x3 seq_image_transform_matrix_get_ex(const Scene *scene,
                                                  const Strip *strip,
                                                  bool apply_rotation = true)
{
  const StripTransform *transform = strip->data->transform;
  const float2 image_size = strip_raw_image_size_get(scene, strip);
  const float2 origin(image_size.x * transform->origin[0], image_size[1] * transform->origin[1]);
  const float2 translation(transform->xofs, transform->yofs);
  const float rotation = apply_rotation ? transform->rotation : 0.0f;
  const float2 scale(transform->scale_x, transform->scale_y);
  const float2 pivot = origin - (image_size / 2);
 
  const float3x3 matrix = math::from_loc_rot_scale<float3x3>(translation, rotation, scale);
  return math::from_origin_transform(matrix, pivot);
}
 
float3x3 image_transform_matrix_get(const Scene *scene, const Strip *strip)
{
  return seq_image_transform_matrix_get_ex(scene, strip);
}
 
static Array<float2> strip_image_transform_quad_get_ex(const Scene *scene,
                                                       const Strip *strip,
                                                       bool apply_rotation)
{
  const float2 image_size = strip_raw_image_size_get(scene, strip);
 
  const StripCrop *crop = strip->data->crop;
  float2 quad[4]{
      {(image_size[0] / 2) - crop->right, (image_size[1] / 2) - crop->top},
      {(image_size[0] / 2) - crop->right, (-image_size[1] / 2) + crop->bottom},
      {(-image_size[0] / 2) + crop->left, (-image_size[1] / 2) + crop->bottom},
      {(-image_size[0] / 2) + crop->left, (image_size[1] / 2) - crop->top},
  };
 
  const float3x3 matrix = seq_image_transform_matrix_get_ex(scene, strip, apply_rotation);
  const float2 viewport_pixel_aspect(scene->r.xasp / scene->r.yasp, 1.0f);
  const float2 mirror = image_transform_mirror_factor_get(strip);
 
  Array<float2> quad_transformed;
  quad_transformed.reinitialize(4);
 
  for (int i = 0; i < 4; i++) {
    const float2 point = math::transform_point(matrix, quad[i]);
    quad_transformed[i] = point * mirror * viewport_pixel_aspect;
  }
  return quad_transformed;
}
 
Array<float2> image_transform_quad_get(const Scene *scene, const Strip *strip, bool apply_rotation)
{
  return strip_image_transform_quad_get_ex(scene, strip, apply_rotation);
}
 
Array<float2> image_transform_final_quad_get(const Scene *scene, const Strip *strip)
{
  return strip_image_transform_quad_get_ex(scene, strip, true);
}
 
float2 image_preview_unit_to_px(const Scene *scene, const float2 co_src)
{
  return {co_src.x * scene->r.xsch, co_src.y * scene->r.ysch};
}
 
float2 image_preview_unit_from_px(const Scene *scene, const float2 co_src)
{
  return {co_src.x / scene->r.xsch, co_src.y / scene->r.ysch};
}
 
static Bounds<float2> negative_bounds()
{
  return {float2(std::numeric_limits<float>::max()), float2(std::numeric_limits<float>::lowest())};
}
 
Bounds<float2> image_transform_bounding_box_from_collection(Scene *scene,
                                                            blender::Span<Strip *> strips,
                                                            bool apply_rotation)
{
  Bounds<float2> box = negative_bounds();
 
  for (Strip *strip : strips) {
    const Array<float2> quad = image_transform_quad_get(scene, strip, apply_rotation);
    const Bounds<float2> strip_box = *blender::bounds::min_max(quad.as_span());
    box = blender::bounds::merge(box, strip_box);
  }
 
  return box;
}
 
}  // namespace blender::seq