Rescale the image pixels using the full precision.

[apitrace] / gui / apisurface.cpp

diff --git a/gui/apisurface.cpp b/gui/apisurface.cpp
index 050c081756bf4ef7e1f9079802c0790b7589fe35..22de5f0b0d873ab877c4c7dbd89fcdd7268e4fc6 100644 (file)
--- a/gui/apisurface.cpp
+++ b/gui/apisurface.cpp
@@ -1,8 +1,14 @@
 #include "apisurface.h"
+#include "thumbnail.h"
+
+#include <sstream>
 
 #include <QDebug>
 #include <QSysInfo>
 
+#include "image/image.hpp"
+
+
 ApiSurface::ApiSurface()
 {
 }
@@ -17,33 +23,59 @@ void ApiSurface::setSize(const QSize &size)
     m_size = size;
 }
 
-int ApiSurface::numChannels() const
+struct ByteArrayBuf : public std::streambuf
+{
+    ByteArrayBuf(QByteArray & a)
+    {
+        setg(a.data(), a.data(), a.data() + a.size());
+    }
+};
+
+void ApiSurface::contentsFromBase64(const QByteArray &base64)
 {
-    return m_numChannels;
+    m_base64Data = base64;
+
+    /*
+     * We need to do the conversion to create the thumbnail
+     */
+    image::Image *image = imageFromBase64(base64);
+    Q_ASSERT(image);
+    QImage img = qimageFromRawImage(image);
+    m_thumb = thumbnail(img);
+    delete image;
 }
 
-void ApiSurface::setNumChannels(int numChannels)
+QByteArray ApiSurface::base64Data() const
 {
-    m_numChannels = numChannels;
+    return m_base64Data;
 }
 
-void ApiSurface::contentsFromBase64(const QByteArray &base64)
+QImage ApiSurface::thumb() const
 {
-    QByteArray dataArray = QByteArray::fromBase64(base64);
-    m_image.loadFromData(dataArray, "png");
-    m_thumb = m_image.scaled(64, 64, Qt::KeepAspectRatio);
+    return m_thumb;
 }
 
-QImage ApiSurface::image() const
+int ApiSurface::depth() const
 {
-    return m_image;
+    return m_depth;
 }
 
-QImage ApiSurface::thumb() const
+void ApiSurface::setDepth(int depth)
 {
-    return m_thumb;
+    m_depth = depth;
+}
+
+QString ApiSurface::formatName() const
+{
+    return m_formatName;
 }
 
+void ApiSurface::setFormatName(const QString &str)
+{
+    m_formatName = str;
+}
+
+
 ApiTexture::ApiTexture()
     : ApiSurface()
 {
@@ -73,3 +105,117 @@ void ApiFramebuffer::setType(const QString &str)
 {
     m_type = str;
 }
+
+image::Image *
+ApiSurface::imageFromBase64(const QByteArray &base64)
+{
+    QByteArray dataArray = QByteArray::fromBase64(base64);
+    image::Image *image;
+
+    /*
+     * Detect the PNG vs PFM images.
+     */
+    const char pngSignature[] = {(char)0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0};
+    if (dataArray.startsWith(pngSignature)) {
+        ByteArrayBuf buf(dataArray);
+        std::istream istr(&buf);
+        image = image::readPNG(istr);
+    } else {
+        image = image::readPNM(dataArray.data(), dataArray.size());
+    }
+
+    return image;
+}
+
+
+static inline unsigned char clamp(int x)
+{
+    if (x <= 0) {
+        return 0;
+    }
+    if (x > 255) {
+        return 255;
+    }
+    return (unsigned char) x;
+}
+
+static inline unsigned char clamp(float x)
+{
+    if (x <= 0.0f) {
+        return 0;
+    }
+    if (x > 255.0f) {
+        return 255;
+    }
+    return (unsigned char) (x + 0.5f);
+}
+
+
+QImage
+ApiSurface::qimageFromRawImage(const image::Image *image,
+                               float lowerValue,
+                               float upperValue,
+                               bool opaque,
+                               bool alpha)
+{
+    QImage img;
+    int width = image->width;
+    int height = image->height;
+
+    img = QImage(width, height, QImage::Format_ARGB32);
+
+    int offset = - lowerValue * 255;
+    int scale = 256 / (upperValue - lowerValue);
+
+    float offset_f = - lowerValue;
+    float scale_f = 255.0f / (upperValue - lowerValue);
+
+    int aMask = (opaque || alpha) ? 0xff : 0;
+
+    const unsigned char *srcRow = image->start();
+    for (int y = 0; y < height; ++y) {
+        QRgb *dst = (QRgb *)img.scanLine(y);
+
+        if (image->channelType == image::TYPE_UNORM8) {
+            const unsigned char *src = srcRow;
+            for (int x = 0; x < width; ++x) {
+                unsigned char rgba[4] = {0, 0, 0, 0xff};
+                for (int c = 0; c < image->channels; ++c) {
+                    rgba[c] = clamp(((*src++ + offset) * scale) >> 8);
+                }
+                if (image->channels == 1) {
+                    // Use gray-scale instead of red
+                    rgba[1] = rgba[0];
+                    rgba[2] = rgba[0];
+                }
+                if (alpha) {
+                    rgba[2] = rgba[1] = rgba[0] = rgba[3];
+                }
+                rgba[3] |= aMask;
+                dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
+            }
+        } else {
+            const float *src = (const float *)srcRow;
+            for (int x = 0; x < width; ++x) {
+                unsigned char rgba[4] = {0, 0, 0, 0xff};
+                for (int c = 0; c < image->channels; ++c) {
+                    rgba[c] = clamp((*src++ + offset_f)*scale_f);
+                }
+                if (image->channels == 1) {
+                    // Use gray-scale instead of red
+                    rgba[1] = rgba[0];
+                    rgba[2] = rgba[0];
+                }
+                if (alpha) {
+                    rgba[2] = rgba[1] = rgba[0] = rgba[3];
+                }
+                rgba[3] |= aMask;
+                dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
+            }
+        }
+
+        srcRow += image->stride();
+    }
+
+    return img;
+}