debugger: Make draw command image widget resize

debugger/QT/SkDrawCommandGeometryWidget.cpp

+
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <QtGui>
+
+#include "SkDebugger.h"
+#include "SkDrawCommandGeometryWidget.h"
+
+SkDrawCommandGeometryWidget::SkDrawCommandGeometryWidget(SkDebugger *debugger)
+    : QFrame()
+    , fDebugger(debugger) {
+    this->setStyleSheet("QFrame {background-color: black; border: 1px solid #cccccc;}");
+}
+
+void SkDrawCommandGeometryWidget::resizeEvent(QResizeEvent* event) {
+    this->QFrame::resizeEvent(event);
+    QRect r = this->contentsRect();
+    int dim = std::min(r.width(), r.height());
+    if (dim == 0) {
+        fSurface.reset(NULL);
+    } else {
+        SkImageInfo info = SkImageInfo::MakeN32Premul(dim, dim);
+        fSurface.reset(SkSurface::NewRaster(info));
+        this->updateImage();
+    }
+}
+
+void SkDrawCommandGeometryWidget::paintEvent(QPaintEvent* event) {
+    this->QFrame::paintEvent(event);
+
+    if (!fSurface) {
+        return;
+    }
+
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    SkImageInfo info;
+    size_t rowPixels;
+    if (const void* pixels = fSurface->peekPixels(&info, &rowPixels)) {
+        SkASSERT(info.width() > 0);
+        SkASSERT(info.height() > 0);
+
+        QRectF resultRect;
+        if (this->width() < this->height()) {
+            float ratio = this->width() / info.width();
+            resultRect = QRectF(0, 0, this->width(), ratio * info.height());
+        } else {
+            float ratio = this->height() / info.height();
+            resultRect = QRectF(0, 0, ratio * info.width(), this->height());
+        }
+
+        resultRect.moveCenter(this->contentsRect().center());
+
+        QImage image(reinterpret_cast<const uchar*>(pixels),
+                     info.width(),
+                     info.height(),
+                     QImage::Format_ARGB32_Premultiplied);
+        painter.drawImage(resultRect, image);
+    }
+}
+
+void SkDrawCommandGeometryWidget::updateImage() {
+    if (!fSurface) {
+        return;
+    }
+
+    bool didRender = false;
+    const SkTDArray<SkDrawCommand*>& commands = fDebugger->getDrawCommands();
+    if (0 != commands.count()) {
+        SkDrawCommand* command = commands[fDebugger->index()];
+        didRender = command->render(fSurface->getCanvas());
+    }
+
+    if (!didRender) {
+        fSurface->getCanvas()->clear(SK_ColorTRANSPARENT);
+    }
+
+    fSurface->getCanvas()->flush();
+    update();
+}