PDF-FIZ库学习1：Device相关解释

本文链接：https://blog.youkuaiyun.com/weixin_37972910/article/details/118753026

这个博客讨论了`fz_device`结构体在图形处理中的作用，它包含了用于填充路径、描边路径、裁剪路径等图形操作的函数指针。此外，还涉及到文本、阴影、图像以及颜色空间的处理方法，揭示了设备在渲染流程中的核心功能。

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设备定义结构体

struct fz_device
{
	int refs;
	int hints;
	int flags;
	void (*close_device)(fz_context *, fz_device *);
	void (*drop_device)(fz_context *, fz_device *);

	void (*fill_path)(fz_context *, fz_device *, const fz_path *, int even_odd, fz_matrix, fz_colorspace *, const float *color, float alpha, fz_color_params );
	void (*stroke_path)(fz_context *, fz_device *, const fz_path *, const fz_stroke_state *, fz_matrix, fz_colorspace *, const float *color, float alpha, fz_color_params );
	void (*clip_path)(fz_context *, fz_device *, const fz_path *, int even_odd, fz_matrix, fz_rect scissor);
	void (*clip_stroke_path)(fz_context *, fz_device *, const fz_path *, const fz_stroke_state *, fz_matrix, fz_rect scissor);

	void (*fill_text)(fz_context *, fz_device *, const fz_text *, fz_matrix, fz_colorspace *, const float *color, float alpha, fz_color_params );
	void (*stroke_text)(fz_context *, fz_device *, const fz_text *, const fz_stroke_state *, fz_matrix, fz_colorspace *, const float *color, float alpha, fz_color_params );
	void (*clip_text)(fz_context *, fz_device *, const fz_text *, fz_matrix, fz_rect scissor);
	void (*clip_stroke_text)(fz_context *, fz_device *, const fz_text *, const fz_stroke_state *, fz_matrix, fz_rect scissor);
	void (*ignore_text)(fz_context *, fz_device *, const fz_text *, fz_matrix );

	void (*fill_shade)(fz_context *, fz_device *, fz_shade *shd, fz_matrix ctm, float alpha, fz_color_params color_params);
	void (*fill_image)(fz_context *, fz_device *, fz_image *img, fz_matrix ctm, float alpha, fz_color_params color_params);
	void (*fill_image_mask)(fz_context *, fz_device *, fz_image *img, fz_matrix ctm, fz_colorspace *, const float *color, float alpha, fz_color_params color_params);
	void (*clip_image_mask)(fz_context *, fz_device *, fz_image *img, fz_matrix ctm, fz_rect scissor);

	void (*pop_clip)(fz_context *, fz_device *);

	void (*begin_mask)(fz_context *, fz_device *, fz_rect area, int luminosity, fz_colorspace *, const float *bc, fz_color_params );
	void (*end_mask)(fz_context *, fz_device *);
	void (*begin_group)(fz_context *, fz_device *, fz_rect area, fz_colorspace *cs, int isolated, int knockout, int blendmode, float alpha);
	void (*end_group)(fz_context *, fz_device *);

	int (*begin_tile)(fz_context *, fz_device *, fz_rect area, fz_rect view, float xstep, float ystep, fz_matrix ctm, int id);
	void (*end_tile)(fz_context *, fz_device *);

	void (*render_flags)(fz_context *, fz_device *, int set, int clear);
	void (*set_default_colorspaces)(fz_context *, fz_device *, fz_default_colorspaces *);

	void (*begin_layer)(fz_context *, fz_device *, const char *layer_name);
	void (*end_layer)(fz_context *, fz_device *);

	fz_rect d1_rect;

	int container_len;
	int container_cap;
	fz_device_container_stack *container;
};