images::ImageRenderTask Class Reference

#include <image_render_task.h>

Inheritance diagram for images::ImageRenderTask:

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Collaboration diagram for images::ImageRenderTask:

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Public Member Functions
	ImageRenderTask (const std::string &page_anchor, const ImagePageAttrs &attributes, int reference_id, ImagesRenderer *p_renderer, void *p_user_data)
virtual	~ImageRenderTask (void)
virtual void	execute (void)
	Execute task with task context.

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Detailed Description

Definition at line 35 of file image_render_task.h.

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Constructor & Destructor Documentation

images::ImageRenderTask::ImageRenderTask	(	const std::string &	page_anchor,
		const ImagePageAttrs &	attributes,
		int	reference_id,
		ImagesRenderer *	p_renderer,
		void *	p_user_data
	)

Definition at line 36 of file image_render_task.cpp.

References LOGPRINTF.

: anchor(page_anchor)
, ref_id(reference_id)
, renderer(p_renderer)        
, user_data(p_user_data)
{
    LOGPRINTF("anchor[%s], ref_id[%d]", anchor.c_str(), ref_id);

    attrs = attributes;
}

images::ImageRenderTask::~ImageRenderTask

(

void

)

[virtual]

Definition at line 51 of file image_render_task.cpp.

References LOGPRINTF.

{
    LOGPRINTF("entry");
}

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Member Function Documentation

void images::ImageRenderTask::execute

(

void

)

[virtual]

Execute task with task context.

Implements common::Task.

Definition at line 56 of file image_render_task.cpp.

References images::ImagesRenderer::add_page(), images::ImagesRenderer::can_render(), images::ImagesRenderer::get_page(), images::IMG_RENDER_FAIL, images::IMG_RENDER_OK, LOGPRINTF, images::ImagesRenderer::notify_page_ready(), images::ImagePage::render(), images::ImagePageAttrs::rotation, WARNPRINTF, and images::ImagePageAttrs::zoom.

{ 
    LOGPRINTF("anchor[%s], zoom[%f], rotation[%d], reference_id[%d]",
               anchor.c_str(), attrs.zoom, attrs.rotation, ref_id );

    assert(renderer);

    // Check wether this page is already in pages_cache?
    ImagePage * ptr = renderer->get_page(anchor, attrs);
    if (ptr)
    {
        WARNPRINTF("Page %s already in pages cache!", anchor.c_str());
        
        // Notify renderer this page is ready now.
        renderer->notify_page_ready(ptr, ref_id, IMG_RENDER_OK, user_data);
        return;
    }

    // Check wether there's enough memory, then render this page.
    ImageRenderStatus ret = renderer->can_render(anchor, attrs);
    ImagePage * image = 0; 
    if (ret == IMG_RENDER_OK)
    {
        // Render the image
        image = new ImagePage(anchor, attrs); 
        assert(image);
        bool ok = image->render();
        if (!ok)
        {
            ret = IMG_RENDER_FAIL;
        }
    }
    if (ret != IMG_RENDER_OK)
    {
        WARNPRINTF("Can't render page %s. Error code: %d", anchor.c_str(), ret);

        // Notify renderer this page is not ready for some reason.
        renderer->notify_page_ready(0, ref_id, ret, user_data);
        delete image;
        return;
    }
    
    // Push the ImagePage into 'pages cache'
    renderer->add_page(image);
        
    // Notify renderer this page is ready.
    renderer->notify_page_ready(image, ref_id, ret, user_data);
}

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The documentation for this class was generated from the following files:

• image_render_task.h
• image_render_task.cpp