xo-imgui: imgui_ex4 builds. font uploading works

xo-imgui/example/ex4/GenerationLayout.hpp

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+/* GenerationLayout.hpp */
+
+#include "GcGenerationDescription.hpp"
+#include "xo/imgui/ImRect.hpp"
+
+/** @class GenerationLayout
+ *  @brief layout for displaying a single collector generation.
+ *
+ *  @text
+ *       reserved: xxx committed: xxxx G1: xxx bytes G0: xxx bytes
+ *       +--------------------------+--------------------+-------------------------+
+ *    to |            G1            |         G0         |                         |
+ *       +--------------------------+--------------------+-------------------------+
+ *                                                                                   Mem: 28k
+ *       +-------------------------------------------------------------------------+
+ *  from |                                                                         |
+ *       +-------------------------------------------------------------------------+
+ *                                                                    ^
+ *  layout elements:
+ *
+ *  <-a-><------------------------------ mem_w ------------------------------------><---b---->
+ *       <------------------------- ngc_w ---------------------------->
+ *       <--------- G1_w ----------> <------- G0_w ----->
+ *
+ *  a (lh_text_dx): width for left-hand-side text
+ *  b (rh_text_dx): width for right-hand-side text
+ *  mem_w:          width for contiguous committed memory
+ *  ngc_w:          location (relative to start of GC memory range) of next-collection trigger
+ *  G1_w:           width for occupied memory that has survived one GC in this space
+ *  G0_w:           width for memory allocated since last GC
+ *
+ *  @endtext
+ *
+ **/
+struct GenerationLayout {
+    GenerationLayout() = default;
+    GenerationLayout(const GcGenerationDescription & gendescr, const ImRect & br, bool with_labels);
+
+    const char * name() const { return gendescr_.name_; }
+    const char * mnemonic() const { return gendescr_.mnemonic_; }
+    const char * gc_type() const { return gendescr_.gc_type_; }
+    std::size_t to_G1_size() const { return gendescr_.before_checkpoint_; }
+    std::size_t to_G0_size() const { return gendescr_.after_checkpoint_; }
+    std::size_t to_gc_threhsold() const { return gendescr_.gc_threshold_; }
+    float to_scale() const {
+        /** note: deliberate size_t->float conversion here **/
+        return gendescr_.scale();
+    }
+    ImRect to_g1_rect() const {
+        return mem_rect_to_.left_fraction(this->to_G1_size() / this->to_scale());
+    }
+    ImRect to_g0_rect() const {
+        return mem_rect_to_.mid_x_fraction(this->to_G1_size() / this->to_scale(),
+                                           (this->to_G1_size() + this->to_G0_size()) / this->to_scale());
+    }
+    ImRect to_alloc_rect() const {
+        return mem_rect_to_.left_fraction((this->to_G1_size() + this->to_G0_size()) / this->to_scale());
+    }
+
+    ImRect from_alloc_rect() const {
+        /* use the same sizing as for source generation */
+        return mem_rect_from_.left_fraction((this->to_G1_size() + this->to_G0_size()) / this->to_scale());
+    }
+
+    /** size-related statistics for generation to be displayed **/
+    GcGenerationDescription gendescr_;
+
+    /** bounding rectangle.  all drawing for generation display will be inside this rectanglge **/
+    ImRect bounding_rect_;
+
+    /** true iff text labels enabled **/
+    bool with_labels_ = false;
+
+    /** text height in screen units **/
+    float text_dy_ = 0.0;
+
+    /** chart rectangle.  bounding rectangle less room for headline text **/
+    ImRect chart_withlabel_rect_;
+    ImRect chart_nolabel_rect_;
+
+    /** text for RH label.  something like "N: 28k/40k" **/
+    xo::flatstring<80> rh_text_;
+
+    /** width of .rh_text in screen units **/
+    float rh_text_dx_ = 0.0;
+
+    /** rectangle representing from-space memory range **/
+    ImRect mem_rect_from_;
+    /** rectangle representing to-space memory range **/
+    ImRect mem_rect_to_;
+};
+
+/* GenerationLayout.hpp */