Add a display of the grabbed frame to the analyzer window.

[nageru] / analyzer.cpp

diff --git a/analyzer.cpp b/analyzer.cpp
index 2ed00f149b1d06924ca7576da16e47e299949d89..eb1f5170be9b617ffe69173988e1f87b7ce812af 100644 (file)
--- a/analyzer.cpp
+++ b/analyzer.cpp
@@ -107,19 +107,27 @@ void Analyzer::grab_clicked()
        unsigned char *buf = (unsigned char *)glMapBuffer(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY);
        check_error();
 
+       QImage img(global_flags.width, global_flags.height, QImage::Format_ARGB32_Premultiplied);
+       size_t pitch = global_flags.width * 4;
+       for (int y = 0; y < global_flags.height; ++y) {
+               memcpy(img.scanLine(global_flags.height - y - 1), buf + y * pitch, pitch);
+       }
+
+       QPixmap pixmap;
+       pixmap.convertFromImage(QImage(img));
+       ui->grabbed_frame_label->setPixmap(pixmap);
+
        int r_hist[256] = {0}, g_hist[256] = {0}, b_hist[256] = {0};
        const unsigned char *ptr = buf;
-       for (int y = 0; y < global_flags.width; ++y) {
-               for (int x = 0; x < global_flags.height; ++x) {
-                       uint8_t b = *ptr++;
-                       uint8_t g = *ptr++;
-                       uint8_t r = *ptr++;
-                       uint8_t a = *ptr++;
-
-                       ++r_hist[r];
-                       ++g_hist[g];
-                       ++b_hist[b];
-               }
+       for (int i = 0; i < global_flags.height * global_flags.width; ++i) {
+               uint8_t b = *ptr++;
+               uint8_t g = *ptr++;
+               uint8_t r = *ptr++;
+               ++ptr;
+
+               ++r_hist[r];
+               ++g_hist[g];
+               ++b_hist[b];
        }
 
        glUnmapBuffer(GL_PIXEL_PACK_BUFFER);