In Futatabi, make it possible to set custom source labels.

[nageru] / futatabi / jpeg_frame_view.cpp

diff --git a/futatabi/jpeg_frame_view.cpp b/futatabi/jpeg_frame_view.cpp
index adc376455ec4eb06c7f8e5550b38037fa1aebeb8..eb0ed0925947b5a1571d6ba0ff46a00d1bc5385f 100644 (file)
--- a/futatabi/jpeg_frame_view.cpp
+++ b/futatabi/jpeg_frame_view.cpp
@@ -465,10 +465,25 @@ void JPEGFrameView::set_overlay(const string &text)
                return;
        }
 
+       // Figure out how large the texture needs to be.
+       {
+               QImage img(overlay_width, overlay_height, QImage::Format_Grayscale8);
+               QPainter painter(&img);
+               QFont font = painter.font();
+               font.setPointSize(12);
+               QFontMetrics metrics(font);
+               overlay_base_width = lrint(metrics.boundingRect(QString::fromStdString(text)).width() + 8.0);
+               overlay_base_height = lrint(metrics.height());
+       }
+
        float dpr = QGuiApplication::primaryScreen()->devicePixelRatio();
        overlay_width = lrint(overlay_base_width * dpr);
        overlay_height = lrint(overlay_base_height * dpr);
 
+       // Work around OpenGL alignment issues.
+       while (overlay_width % 4 != 0) ++overlay_width;
+
+       // Now do the actual drawing.
        overlay_image.reset(new QImage(overlay_width, overlay_height, QImage::Format_Grayscale8));
        overlay_image->setDevicePixelRatio(dpr);
        overlay_image->fill(0);