Kanzi编程基础3 - 图片读取与显示

Kanzi开发的时候会遇到需要从外部读取图片的情况。Kanzi2.8版本和3.3版本读取方法稍有不同，我们先看看2.8版本的api。

【2.8版本】

1）首先要从文件中读取一张图片

struct KzcImage* img;
kzcImageLoadFile(kzaApplicationGetSystemMemoryManager(application),"1.png",& img);

 

2）把文件中读取到的图片转成Texture

KzuImageTexture* texture;
kzuImageTextureCreateFromImage(resMgr, "FileTexture",
                   img, KZU_TEXTURE_FILTER_BILINEAR, KZU_TEXTURE_WRAP_CLAMP, 0.0f, &texture);

或者从内存数据中创建一个Texture：

kzuImageTextureCreateFromMemory(resourceManger,name,

                                        KZU_TEXTURE_CHANNELS_RGB,

                                        img.width(), img.height(), img.bits(),

                                        KZU_TEXTURE_FILTER_BILINEAR, KZU_TEXTURE_WRAP_CLAMP, &imageTexture);

 

其中resourceManger是一个ResourceManger对象，name为Texture的名称，KZU_TEXTURE_CHANNELS_RGB为创建的图像模式，bits（）为图片数据，最终创建到imageTexture中。

3）创建之后转成resource并赋给plane节点

struct KzuResource* out_resource;

out_resource = kzuImageTextureToResource(texture);

kzuObjectNodeSetResourceIDResourceProperty(planeNode,KZU_PROPERTY_TYPE_TEXTURE,out_resource);

kzuObjectNodeSetIntProperty(m_planeNode, KZU_PROPERTY_TYPE_BLEND_MODE, 1);

kzuResourceRelease(out_resource);

 

 

【3.3版本】

3.3可以参考kanzi安装目录下的 virtual listbox的例子。

下面是例子中的关键代码：

 1 if (m_itemInfo->m_objectNode && m_image)
 2 {
 3 Domain* domain = m_itemGenerator->m_listBox->getDomain();
 4 
 5 // Create texture from image. If the image data format is correct, this shouldn't use any memory manager.
 6 // Image texture will own the image so no need to delete it manually.
 7 TextureSharedPtr texture = Texture::create(domain, m_image, Texture::CreateFlagClampAddress);
 8 m_itemInfo->m_objectNode->setProperty(StandardMaterial::TextureProperty, texture);
 9 
10 // Adjust size of plane for displaying the image.
11 Node3DSharedPtr imagePlaneNode = m_itemInfo->m_objectNode->lookupNode<Node3D>("Stack Layout/Plane");
12 
13 kzUint height = kzcImageGetHeight(m_image);
14 kzUint width = kzcImageGetWidth(m_image);
15 float aspect = width * 1.0f / height;
16 
17 kzFloat widthFactor = aspect;
18 kzFloat heightFactor = 1.0f;
19 
20 if(aspect > 1.0f)
21 {
22 widthFactor = 1.0f;
23 heightFactor = 1.0f / aspect;
24 }
25 
26 imagePlaneNode->setLayoutTransformation(Matrix4x4::createScale(Vector3(widthFactor, heightFactor, 1.0f)));
27 
28 // Ownership of image was transferred to the texture.
29 m_image = 0;
30 }
31 
32 // Remove task.
33 m_itemGenerator->m_tasksByItems.erase(m_itemInfo);

3.3版本的代码暂时还没有分析，待补充……

 

posted @ 2016-10-12 15:43  Little蒙  阅读(1675)  评论(0)  编辑  收藏  举报