From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Tue, 9 May 2017 07:37:26 +0000 (+0200)
Subject: Make it possible to hover over the grabbed image to get out RGB values.
X-Git-Tag: 1.6.0~34
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=6223907d8b15692270399abd1e94b1ae51551046;p=nageru

Make it possible to hover over the grabbed image to get out RGB values.
---

diff --git a/analyzer.cpp b/analyzer.cpp
index eb1f517..08de86f 100644
--- a/analyzer.cpp
+++ b/analyzer.cpp
@@ -1,6 +1,7 @@
 #include "analyzer.h"
 
 #include <QDialogButtonBox>
+#include <QMouseEvent>
 #include <QSurface>
 
 #include <movit/resource_pool.h>
@@ -14,7 +15,8 @@
 using namespace std;
 
 Analyzer::Analyzer()
-	: ui(new Ui::Analyzer)
+	: ui(new Ui::Analyzer),
+	  grabbed_image(global_flags.width, global_flags.height, QImage::Format_ARGB32_Premultiplied)
 {
 	ui->setupUi(this);
 
@@ -32,6 +34,7 @@ Analyzer::Analyzer()
 	connect(ui->grab_btn, &QPushButton::clicked, bind(&Analyzer::grab_clicked, this));
 	connect(ui->input_box, static_cast<void(QComboBox::*)(int)>(&QComboBox::currentIndexChanged), bind(&Analyzer::signal_changed, this));
 	signal_changed();
+	ui->grabbed_frame_label->installEventFilter(this);
 
 	surface = create_surface(QSurfaceFormat::defaultFormat());
 	context = create_context(surface);
@@ -107,14 +110,13 @@ 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);
+		memcpy(grabbed_image.scanLine(global_flags.height - y - 1), buf + y * pitch, pitch);
 	}
 
 	QPixmap pixmap;
-	pixmap.convertFromImage(QImage(img));
+	pixmap.convertFromImage(grabbed_image);
 	ui->grabbed_frame_label->setPixmap(pixmap);
 
 	int r_hist[256] = {0}, g_hist[256] = {0}, b_hist[256] = {0};
@@ -158,3 +160,27 @@ void Analyzer::signal_changed()
 	Mixer::Output channel = static_cast<Mixer::Output>(ui->input_box->currentData().value<int>());
 	ui->display->set_output(channel);
 }
+
+bool Analyzer::eventFilter(QObject *watched, QEvent *event)
+{
+	if (event->type() == QEvent::MouseMove &&
+	    watched->isWidgetType()) {
+		const QMouseEvent *mouse_event = (QMouseEvent *)event;
+		const QPixmap *pixmap = ui->grabbed_frame_label->pixmap();
+		if (pixmap != nullptr) {
+			int x = lrint(mouse_event->x() * double(pixmap->width()) / ui->grabbed_frame_label->width());
+			int y = lrint(mouse_event->y() * double(pixmap->height()) / ui->grabbed_frame_label->height());
+			x = std::min(x, pixmap->width() - 1);
+			y = std::min(y, pixmap->height() - 1);
+			QRgb pixel = grabbed_image.pixel(x, y);
+			ui->red_label->setText(QString::fromStdString(to_string(qRed(pixel))));
+			ui->green_label->setText(QString::fromStdString(to_string(qGreen(pixel))));
+			ui->blue_label->setText(QString::fromStdString(to_string(qBlue(pixel))));
+
+			char buf[256];
+			snprintf(buf, sizeof(buf), "#%02x%02x%02x", qRed(pixel), qGreen(pixel), qBlue(pixel));
+			ui->hex_label->setText(buf);
+		}
+        }
+        return false;
+}
diff --git a/analyzer.h b/analyzer.h
index 3cefdc9..68fb14e 100644
--- a/analyzer.h
+++ b/analyzer.h
@@ -2,6 +2,7 @@
 #define _ANALYZER_H 1
 
 #include <QDialog>
+#include <QImage>
 #include <QString>
 
 #include <epoxy/gl.h>
@@ -29,12 +30,14 @@ public:
 private:
 	void grab_clicked();
 	void signal_changed();
+	bool eventFilter(QObject *watched, QEvent *event) override;
 
 	Ui::Analyzer *ui;
 	QSurface *surface;
 	QOpenGLContext *context;
 	GLuint pbo;
 	movit::ResourcePool *resource_pool = nullptr;
+	QImage grabbed_image;
 };
 
 #endif  // !defined(_ANALYZER_H)
diff --git a/ui_analyzer.ui b/ui_analyzer.ui
index 0b46e14..ad50d35 100644
--- a/ui_analyzer.ui
+++ b/ui_analyzer.ui
@@ -131,14 +131,14 @@
      </widget>
     </item>
     <item row="1" column="1">
-     <widget class="QLabel" name="label_9">
+     <widget class="QLabel" name="green_label">
       <property name="text">
        <string>127</string>
       </property>
      </widget>
     </item>
     <item row="2" column="1">
-     <widget class="QLabel" name="label_10">
+     <widget class="QLabel" name="blue_label">
       <property name="text">
        <string>127</string>
       </property>
@@ -152,7 +152,7 @@
      </widget>
     </item>
     <item row="0" column="1">
-     <widget class="QLabel" name="label_8">
+     <widget class="QLabel" name="red_label">
       <property name="text">
        <string>127</string>
       </property>
@@ -166,7 +166,7 @@
      </widget>
     </item>
     <item row="3" column="1">
-     <widget class="QLabel" name="label_11">
+     <widget class="QLabel" name="hex_label">
       <property name="text">
        <string>#7f7f7f</string>
       </property>
@@ -206,6 +206,12 @@
      <height>270</height>
     </rect>
    </property>
+   <property name="cursor">
+    <cursorShape>CrossCursor</cursorShape>
+   </property>
+   <property name="mouseTracking">
+    <bool>true</bool>
+   </property>
    <property name="autoFillBackground">
     <bool>false</bool>
    </property>