extend page interface with render context

1 files changed, 54 insertions, 1 deletions

diff --git a/include/nspdf/page.h b/include/nspdf/page.h
index 8c1d7fc..f8c280e 100644
--- a/include/nspdf/page.h
+++ b/include/nspdf/page.h
@@ -19,8 +19,61 @@
 
 struct nspdf_doc;
 
+/**
+ * Type of plot operation
+ */
+enum nspdf_style_operation {
+    NSPDF_OP_TYPE_NONE = 0, /**< No operation */
+    NSPDF_OP_TYPE_SOLID, /**< Solid colour */
+    NSPDF_OP_TYPE_DOT, /**< Dotted plot */
+    NSPDF_OP_TYPE_DASH, /**< Dashed plot */
+};
+
+
+/**
+ * Plot style for stroke/fill plotters
+ */
+typedef struct nspdf_style {
+    enum nspdf_style_operation stroke_type; /**< Stroke plot type */
+    int stroke_width; /**< Width of stroke, in pixels */
+    uint32_t stroke_colour; /**< Colour of stroke XBGR */
+
+    enum nspdf_style_operation fill_type; /**< Fill plot type */
+    uint32_t fill_colour; /**< Colour of fill XBGR */
+} nspdf_style;
+
+
+enum nspdf_path_command {
+    NSPDF_PATH_MOVE = 0,
+    NSPDF_PATH_CLOSE,
+    NSPDF_PATH_LINE,
+    NSPDF_PATH_BEZIER,
+};
+
+struct nspdf_render_ctx {
+    const void *ctx; /**< context passed to drawing functions */
+
+    float device_space[6]; /* user space to device space transformation matrix */
+
+    /**
+     * Plots a path.
+     *
+     * Path plot consisting of lines and cubic Bezier curves. Line and fill
+     *  colour is controlled by the style. All elements of the path are in
+     *  device space.
+     *
+     * \param style Style controlling the path plot.
+     * \param p elements of path
+     * \param n nunber of elements on path
+     * \param transform A transform to apply to the path.
+     * \param ctx The drawing context.
+     * \return NSERROR_OK on success else error code.
+     */
+    nspdferror (*path)(const struct nspdf_style *style, const float *p, unsigned int n, const float transform[6], const void *ctx);
+};
+
 nspdferror nspdf_page_count(struct nspdf_doc *doc, unsigned int *pages_out);
 
-nspdferror nspdf_page_render(struct nspdf_doc *doc, unsigned int page_num);
+nspdferror nspdf_page_render(struct nspdf_doc *doc, unsigned int page_num, struct nspdf_render_ctx* render_ctx);
 
 #endif /* NSPDF_META_H_ */