CWebRender initial commit

gfx/wr/webrender.h

@@ -0,0 +1,100 @@
+#ifndef gfx_webrender_h
+#define gfx_webrender_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct wr_context wr_context;
+
+typedef struct {
+  float x;
+  float y;
+  float width;
+  float height;
+} wr_rect;
+
+typedef struct {
+  float r;
+  float g;
+  float b;
+  float a;
+} wr_color;
+
+/* A 2D affine transform in the same layout used by gfx::Matrix. */
+typedef struct {
+  float m11;
+  float m12;
+  float m21;
+  float m22;
+  float m31;
+  float m32;
+} wr_transform;
+
+typedef struct {
+  wr_rect rect;
+  wr_color color;
+} wr_gpu_quad;
+
+typedef struct {
+  uint32_t first_quad;
+  uint32_t quad_count;
+  wr_color color;
+  wr_transform transform;
+  wr_rect clip_rect;
+  uint8_t has_clip;
+} wr_gpu_batch;
+
+typedef struct {
+  const wr_gpu_quad* quads;
+  size_t quad_count;
+  const wr_gpu_batch* batches;
+  size_t batch_count;
+} wr_frame;
+
+/* Creates a retained display-list context. */
+wr_context* wr_context_create(size_t initial_capacity);
+void wr_context_destroy(wr_context* context);
+
+/* Removes every item from the retained display list. */
+void wr_context_clear(wr_context* context);
+
+/* Sets the viewport used for coarse CPU-side culling. */
+void wr_context_set_viewport(wr_context* context, wr_rect viewport);
+
+/* Sets the transform applied to subsequently recorded primitives. */
+void wr_context_set_transform(wr_context* context, wr_transform transform);
+
+/* Sets the opacity applied to subsequently recorded primitives. */
+void wr_context_set_opacity(wr_context* context, float opacity);
+
+/* Records a retained stacking-context boundary and restores it on pop. */
+int wr_display_list_push_stacking_context(wr_context* context,
+                                          wr_transform transform,
+                                          float opacity);
+void wr_display_list_pop_stacking_context(wr_context* context);
+
+/* Pushes/pops a retained primitive clip. Clips are intersected in order. */
+int wr_display_list_push_clip(wr_context* context, wr_rect clip);
+void wr_display_list_pop_clip(wr_context* context);
+
+/* Adds an opaque or translucent solid rectangle to the display list. */
+int wr_display_list_push_rect(wr_context* context, wr_rect rect,
+                              wr_color color);
+
+/* Explicit transform form for display-list builders. */
+int wr_display_list_push_transformed_rect(wr_context* context, wr_rect rect,
+                                          wr_color color,
+                                          wr_transform transform);
+
+/* Builds the GPU-ready stream from the retained display list. */
+const wr_frame* wr_context_build_frame(wr_context* context);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* gfx_webrender_h */