scons3.0.1scons-design资源-CSDN文库

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### SCons 3.0.1 SCons-Design 相关知识点详解 #### SCons 3.0.1 概述 SCons 是一个开源的构建工具，它使用 Python 编程语言作为其脚本语言，能够高效地管理软件项目的构建过程。版本 3.0.1 是该工具的一个特定版本，提供了对现代开发环境的支持，同时增强了性能和易用性。 #### SCons 设计 (SCons-Design) SCons-Design 指的是 SCons 在设计层面的一些特性，包括但不限于构建系统的设计、配置选项以及如何利用 SCons 的灵活性来适应不同的项目需求。 ### 文件结构与组件解析根据提供的文件列表，我们可以看出这是某个项目的源代码结构。这些文件主要涉及图形渲染、图像处理以及地图渲染等方面的技术。下面将详细分析这些文件所涉及的关键技术点。 #### agg_renderer.os & graphics.os - **agg_renderer.os**：此文件很可能包含了使用 Anti-Grain Geometry (AGG) 库进行渲染的代码。AGG 是一个高质量的图形渲染库，特别适用于生成矢量图形。 - **graphics.os**：此文件可能包含了基础图形操作的实现，如绘制线条、填充形状等。 #### font_set.os & font_engine_freetype.os - **font_set.os**：该文件可能定义了字体集合的管理方式，用于在不同场景下选择合适的字体。 - **font_engine_freetype.os**：FreeType 是一个流行的字体引擎，这个文件应该是 FreeType 字体引擎的实现，用于加载和渲染 TrueType 和 OpenType 字体。 #### stroke.os & line_pattern_symbolizer.os - **stroke.os**：这个文件可能包含了关于绘制线段（stroke）的方法，比如宽度、颜色和样式等。 - **line_pattern_symbolizer.os**：符号化（Symbolizer）是地图渲染中的一个重要概念，该文件可能是关于如何根据不同的模式或样式来渲染线段。 #### mapnik_image.os & image_reader.os - **mapnik_image.os**：Mapnik 是一个强大的地图渲染引擎，这里涉及到了 Mapnik 中对于图像的操作，如创建、修改图像等。 - **image_reader.os**：这可能是一个读取图像文件的模块，支持多种格式，如 PNG、JPEG 等。 #### agg/src/agg_vcgen_stroke.o & agg/src/agg_bspline.o - **agg_vcgen_stroke.o**：AGG 库中的矢量曲线生成器之一，用于生成用于描边的曲线。 - **agg_bspline.o**：AGG 提供的 B样条曲线的实现，常用于平滑曲线的绘制。 #### agg/src/agg_line_aa_basics.o & agg/src/agg_trans_warp_magnifier.o - **agg_line_aa_basics.o**：AGG 中的基础抗锯齿线条绘制功能，用于提高线条的视觉质量。 - **agg_trans_warp_magnifier.o**：AGG 提供的变形和放大功能，可能用于地图的局部放大或其他特殊效果。 #### bindings/python/*.os - 这些文件都与 Python 绑定有关，表明该项目提供了 Python 接口来调用底层的 C++ 功能。例如： - **mapnik_symbolizer.os**：涉及到符号化的设置和使用。 - **mapnik_map.os**：Mapnik 的核心组件之一，用于创建和管理地图对象。 - **mapnik_rule.os**：规则系统，用于控制地图元素的显示条件。 #### plugins/input/shape/*.os & plugins/input/raster/*.os - **shapefile.os** 和 **dbffile.os**：这些文件涉及 Shapefile 数据格式的读取，这是一种常用的地理空间数据格式。 - **raster_datasource.os** 和 **raster_featureset.os**：这些文件涉及到栅格数据的处理，例如卫星图像或扫描的地图图片。 ### 总结从上述文件列表可以看出，该项目很可能是基于 Mapnik 的一个扩展或者定制版本，用于地图渲染和图形处理。通过结合 AGG 库的强大图形能力以及 FreeType 字体引擎的支持，可以实现高质量的地图和图形输出。此外，通过 Python 绑定提供的接口，使得开发者能够更容易地集成到现有的应用程序和服务中，增加了项目的灵活性和可扩展性。

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./sr c/ag g_rend erer .os

./a gg/sr c

./sr c/gr aphi cs.os

./sr c/fo nt_set .os

./a gg/sr c/ag g_vcge n_mar ker s_te rm. o

./sr c/pa ram s.os

./a gg/sr c/ag g_ima ge_fil ters .o

./b indi ngs/p yth on/m apn ik_sym bol izer. os

./sr c/m emo ry.os

./b indi ngs/p yth on/m apn ik_fon t_eng ine. os

./p lugi ns/in put /shap e/db ffil e.os

./a gg/sr c/ag g_line _aa_ba sics.o

./sr c/sav e_map .os

./b indi ngs/p yth on/m apn ik_vi ew_tr ansfo rm. os

./sr c/col or.o s

./a gg/l ibag g.a

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./a gg/sr c/ag g_arc.o

./p lugi ns/in put /shap e/sha pefi le.os

./p lugi ns/in put /rast er/ raste r_dat asour ce.os

./p lugi ns/in put /rast er/ raste r_feat ure set.o s

./sr c/un icod e.os

./b indi ngs/p yth on/m apn ik/o gcser ver

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./sr c/ar row. os

./p lugi ns

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./a gg/sr c/ag g_vcge n_cont our .o

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./p lugi ns/in put /shap e/sha pe_fea tur eset .os

./sr c/lo ad_ma p.os

./b indi ngs/p yth on/m apn ik_poi nt_sy mbo lizer .os

./sr c/li ne_pat ter n_sym boliz er.os

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./p lugi ns/in put /rast er

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./sr c/en velo pe.os

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./sr c/shi eld_sy mbo lizer .os

./a gg/sr c/ag g_tra ns_doub le_pat h.o

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./b indi ngs/p yth on/m apn ik_pr oj_tra nsfor m.o s

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./sr c/im age _rea der. os

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./a gg/sr c/ag g_vcge n_dash .o

./b indi ngs/p yth on/m apn ik_pr oject ion. os

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./a gg/sr c/ag g_emb edde d_rast er_fon ts.o

./sr c/li bmap nik .so

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./a gg/sr c/ag g_sqrt _tabl es.o

./a gg/sr c/ag g_vpg en_clip _poly line. o

./b indi ngs/p yth on/m apn ik_ras ter_sy mbo lizer .os

./a gg/sr c/ag g_line _pr ofile _aa. o

./b indi ngs/p yth on/m apn ik_lin e_pat ter n_symb olize r.os

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./sr c/m emo ry_dat asou rce.o s

./p lugi ns/in put

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./sr c/pn g_read er.o s

./b indi ngs/p yth on/m apn ik_en velop e.os

./b indi ngs/p yth on/m apn ik_str oke. os

./p lugi ns/in put /shap e/sha pe.i nput

./b indi ngs/p yth on/m apn ik_qu ery. os

./sr c/po int_sy mbo lizer .os

./sr c/fi lter _fa ctor y.os

./b indi ngs/p yth on/m apn ik_pol ygo n_symb olize r.os

./a gg/sr c/ag g_vcge n_smo oth_po ly1 .o

./p lugi ns/in put /shap e/sha pe_ind ex_fe atur eset .os

./b indi ngs/p yth on/p yth on_cai ro.os

./sr c/sy mbol izer. os

./b indi ngs/p yth on/_m apn ik.so

./a gg/sr c/ag g_tra ns_affi ne.o

./sr c/po lygo n_pat tern _symb olize r.os

./b indi ngs/p yth on/m apn ik_pol ygo n_patt ern _sym bol izer. os

./a gg/sr c/ag g_curv es.o

./sr c/t ext_sy mbo lizer .os

./sr c/sca le_den omin ato r.os

./p lugi ns/in put /shap e/sha pe_io. os

./sr c/la yer.o s

./a gg

./sr c/li bxm l2_loa der.o s

./a gg/sr c/ag g_vpg en_clip _poly gon.o

./p lugi ns/in put /shap e

./b indi ngs/p yth on/m apn ik_ge omet ry. os

./b indi ngs/p yth on/m apn ik_te xt_sy mbo lizer .os

./a gg/sr c/ag g_roun ded_r ect. o

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SCons 3.0.1

Design

Steven Knight

iii

Table of Contents

1. Introduction .................................................................................................................................... 1

1.1. About This Document ............................................................................................................ 1

2. Goals ............................................................................................................................................. 2

2.1. Fixing Make's problems ......................................................................................................... 3

2.2. Fixing Cons's problems .......................................................................................................... 3

3. Overview ....................................................................................................................................... 4

3.1. Architecture ......................................................................................................................... 4

3.2. Build Engine ........................................................................................................................ 5

3.2.1. Python API ............................................................................................................... 5

3.2.2. Single-image execution ................................................................................................ 5

3.2.3. Dependency analysis ................................................................................................... 5

3.2.4. Customized output ...................................................................................................... 6

3.2.5. Build failures ............................................................................................................. 6

3.3. Interfaces ............................................................................................................................. 6

3.3.1. Native Python interface ............................................................................................... 6

3.3.2. Makefile interface ....................................................................................................... 6

3.3.3. Graphical interfaces .................................................................................................... 7

4. Build Engine API ............................................................................................................................ 8

4.1. General Principles ................................................................................................................. 8

4.1.1. Keyword arguments .................................................................................................... 8

4.1.2. Internal object representation ........................................................................................ 8

4.2. Construction Environments ....................................................................................... 8

4.2.1. Construction variables ................................................................................... 9

4.2.2. Fetching construction variables ...................................................................... 9

4.2.3. Copying a construction environment ................................................................ 9

4.2.4. Multiple construction environments ............................................................... 10

4.2.5. Variable substitution .................................................................................................. 10

4.3. Builder Objects ............................................................................................................... 11

4.3.1. Specifying multiple inputs .......................................................................................... 12

4.3.2. Specifying multiple targets ......................................................................................... 12

4.3.3. File prefixes and suffixes ........................................................................................... 13

4.3.4. Builder object exceptions ....................................................................................... 13

4.3.5. User-defined Builder objects ................................................................................... 13

4.3.6. Copying Builder Objects ........................................................................................ 14

4.3.7. Special-purpose build rules ......................................................................................... 15

4.3.8. The Make Builder ................................................................................................ 15

4.3.9. Builder maps ........................................................................................................ 15

4.4. Dependencies ...................................................................................................................... 16

4.4.1. Automatic dependencies ............................................................................................. 16

4.4.2. Implicit dependencies ................................................................................................ 16

4.4.3. Ignoring dependencies ............................................................................................... 17

4.4.4. Explicit dependencies ................................................................................................ 17

4.5. Scanner Objects ............................................................................................................... 17

4.5.1. User-defined Scanner objects ................................................................................... 18

4.5.2. Copying Scanner Objects ........................................................................................ 18

4.5.3. Scanner maps ........................................................................................................ 19

4.6. Targets .............................................................................................................................. 19

4.6.1. Building targets ........................................................................................................ 19

4.6.2. Removing targets ...................................................................................................... 19

4.6.3. Suppressing cleanup removal of build-targets ................................................................. 20

4.6.4. Suppressing build-target removal ................................................................................. 20

4.6.5. Default targets .......................................................................................................... 20

4.6.6. File installation ......................................................................................................... 21

4.6.7. Target aliases ........................................................................................................... 21

4.7. Customizing output .............................................................................................................. 21

4.8. Separate source and build trees .............................................................................................. 22

4.9. Variant builds ..................................................................................................................... 23

4.10. Code repositories ............................................................................................................... 23

4.11. Derived-file caching ........................................................................................................... 24

4.12. Job management ................................................................................................................ 24

5. Native Python Interface .................................................................................................................. 25

5.1. Configuration files ............................................................................................................... 25

5.2. Python syntax ..................................................................................................................... 25

5.3. Subsidiary configuration Files ............................................................................................... 26

5.4. Variable scoping in subsidiary files ........................................................................................ 26

5.5. Hierarchical builds ............................................................................................................... 27

5.6. Sharing construction environments ........................................................................... 27

5.7. Help .................................................................................................................................. 27

5.8. Debug ............................................................................................................................... 28

6. Other Issues .................................................................................................................................. 29

6.1. Interaction with SC-config .................................................................................................... 29

6.2. Interaction with test infrastructures ......................................................................................... 29

6.3. Java dependencies ............................................................................................................... 29

6.4. Limitations of digital signature calculation ............................................................................... 30

6.5. Remote execution ................................................................................................................ 30

6.6. Conditional builds ............................................................................................................... 30

7. Background ................................................................................................................................... 31

8. Summary ...................................................................................................................................... 32

9. Acknowledgements ........................................................................................................................ 33

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