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Fix pixel sampler with translate/zoomed image

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Pixel sampler now works with a zoomed/translated image. As usual we
have to flip the y translation as OpenGl stores images upside down.

Need to look at a better way of handling this.
This commit is contained in:
Thomas Wilshaw
2020-06-21 19:59:44 +01:00
parent ccb6efd6b6
commit 8f326c5193
1 changed files with 3 additions and 1 deletions
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app/widget/viewer/viewerdisplay.cpp
+3 -1
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@@ -271,8 +271,10 @@ void ViewerDisplayWidget::mouseMoveEvent(QMouseEvent *event)
QVector3D pixel_pos(static_cast<float>(event->x()) / static_cast<float>(width()) * 2.0f - 1.0f,
static_cast<float>(event->y()) / static_cast<float>(height()) * 2.0f - 1.0f,
0);
QMatrix4x4 transform = GetCompleteMatrix();
*(transform.data() + 13) = *(transform.data() + 13) * -1.0f;
pixel_pos = pixel_pos * GetCompleteMatrix().inverted();
pixel_pos = transform.inverted() * pixel_pos;
int frame_x = qRound((pixel_pos.x() + 1.0f) * 0.5f * last_loaded_buffer_->width());
int frame_y = qRound((pixel_pos.y() + 1.0f) * 0.5f * last_loaded_buffer_->height());