openvgfordummies/shared/utils.cpp

#include "game.h"

/** Loads a PNG file and creates VGImage using the 32bit image data.
  */
VGImage loadVGImage(const char *filename)
{
    QImage texture;
    if(!texture.load(filename))
    {
        qDebug("loadVGImage cannot load '%s'", filename);
        return VG_INVALID_HANDLE;
    }

    // make sure we have 32bit format
    texture = texture.convertToFormat(QImage::Format_ARGB32);

    int w=texture.width();
    int h=texture.height();
    qDebug("loadVGImage '%s' %dx%d", filename, w, h);

    VGImage image = vgCreateImage(VG_sARGB_8888, w, h, VG_IMAGE_QUALITY_FASTER);
    qDebug("vgCreateImage handle %x", image);
    if(image==VG_INVALID_HANDLE)
    {
        VGErrorCode err = vgGetError();
        qDebug("loadVGImage '%s' error 0x%x", filename, err);
    }

    vgImageSubData(image, (QRgb*)texture.bits(), w*4, VG_sARGB_8888, 0, 0, w, h);
    return image;
}