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wxg4net

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注册时间： 2012-01-07

帖子： 274

求教一个conky-lua脚本 图像显示问题

conky-lua-git for lua5.1 软件在 https://aur.archlinux.org/packages/conky-lua51-git 这里
直接用

require 'cairo_imlib2_helper'
cairo_draw_image('/home/Data/pictres/500px/18.jpg' , cs, 0, 0, 0.2, 0.2)

显示图像 无问题。 于是把 cairo_draw_image函数转为lua代码， 则始终无法绘制(空白无错) 以下是代码 求指教：

require 'cairo'
require 'imlib2'

function conky_images()
    if conky_window == nil then return end
    local sw = conky_window.width
    local sh = conky_window.height
    
    local cs = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, sw, sh)

    imlib_set_cache_size(4096 * 1024)
    local image = imlib_load_image('/home/Data/pictures/A01.jpg')
    if image == nil then return end
 
    imlib_context_set_image(image)
    local w = imlib_image_get_width()
    local h = imlib_image_get_height()

    local scaled_w = 0.2 * w
    local scaled_h =   0.2 * h

    local premul = imlib_create_image(scaled_w, scaled_h)

    imlib_context_set_image(premul)
    imlib_context_set_color(0, 0, 0, 255)
    imlib_image_fill_rectangle(0, 0, scaled_w, scaled_h)


    imlib_blend_image_onto_image(image, 0, 0, 0, w, h, 0, 0, scaled_w, scaled_h)

    imlib_image_copy_alpha_to_image(image, 0, 0)

   # 原c代码是 sizeof(u int) * scaled_w 
    local cfsw = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, scaled_w)

    local result = cairo_image_surface_create_for_data( imlib_image_get_data_for_reading_only(),
    CAIRO_FORMAT_ARGB32, scaled_w, scaled_h, cfsw)
    
    local cr = cairo_create(cs);
    cairo_set_source_surface(cr, result, 0, 0)

    cairo_paint_with_alpha(cr, 0.5)

    imlib_context_set_image(image)
    imlib_free_image()
    imlib_context_set_image(premul)
    imlib_free_image()

    cairo_destroy(cr)
    cairo_surface_destroy(result)

end

最近编辑记录 wxg4net (2013-10-29 10:00:21)

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