scissor command

src/main.c3

@@ -162,7 +162,6 @@ fn int main(String[] args)
 					rl::unload_texture(font_texture);
 				}
 				font_texture = rl::load_texture_from_image(font_atlas);
-				//rl::draw_texture(font_texture, 0, 0, rl::WHITE);
 			case ugui::CmdType.CMD_SPRITE:
 				rl::Rectangle source = {
 					.x = cmd.sprite.texture_rect.x,
@@ -176,12 +175,12 @@ fn int main(String[] args)
 				};
 
 				rl::draw_texture_rec(font_texture, source, position, rl::WHITE);
-				//rl::draw_rectangle(cmd.sprite.rect.x,
-				//    cmd.sprite.rect.y,
-				//    cmd.sprite.rect.w,
-				//    cmd.sprite.rect.h,
-				//    rl::WHITE
-				//);
+			case ugui::CmdType.CMD_SCISSOR:
+				if (cmd.scissor.rect.w == 0 && cmd.scissor.rect.h == 0) {
+					rl::end_scissor_mode();
+				} else {
+					rl::begin_scissor_mode(cmd.scissor.rect.x, cmd.scissor.rect.y, cmd.scissor.rect.w, cmd.scissor.rect.h);
+				}
 			default:
 				io::printfn("Unknown cmd type: %s", cmd.type);
 			}

src/ugui_cmd.c3

@@ -7,6 +7,7 @@ enum CmdType {
 	CMD_RECT,
 	CMD_UPDATE_ATLAS,
 	CMD_SPRITE,
+	CMD_SCISSOR,
 }
 
 // command to draw a rect
@@ -16,7 +17,6 @@ struct CmdRect {
 	Color color;
 }
 
-// FIXME: For now only support black and white atlas, so PIXELFORMAT_UNCOMPRESSED_GRAYSCALE
 struct CmdUpdateAtlas {
 	Id id;
 	char* raw_buffer;
@@ -31,6 +31,11 @@ struct CmdSprite {
 	Rect texture_rect;
 }
 
+// if rect is zero Rect{0} then reset the scissor
+struct CmdScissor {
+	Rect rect;
+}
+
 // command structure
 struct Cmd {
 	CmdType type;
@@ -38,6 +43,7 @@ struct Cmd {
 		CmdRect rect;
 		CmdUpdateAtlas update_atlas;
 		CmdSprite sprite;
+		CmdScissor scissor;
 	}
 }
 
@@ -96,6 +102,8 @@ fn void! Ctx.push_string(&ctx, Rect bounds, String text)
 		return;
 	}
 
+	ctx.push_scissor(bounds)!;
+
 	short baseline = (short)ctx.font.ascender;
 	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
 	short line_gap = (short)ctx.font.linegap;
@@ -135,6 +143,9 @@ fn void! Ctx.push_string(&ctx, Rect bounds, String text)
 			continue;
 		}
 	}
+
+	// FIXME: we never get here if an error was thrown before
+	ctx.push_scissor(Rect{})!;
 }
 
 fn void! Ctx.push_update_atlas(&ctx, Atlas* atlas)
@@ -150,4 +161,13 @@ fn void! Ctx.push_update_atlas(&ctx, Atlas* atlas)
 			},
 		};
 	ctx.cmd_queue.enqueue(&up)!;
+}
+
+fn void! Ctx.push_scissor(&ctx, Rect rect)
+{
+	Cmd sc = {
+		.type = CMD_SCISSOR,
+		.scissor.rect = rect,
+	};
+	ctx.cmd_queue.enqueue(&sc)!;
 }

src/ugui_data.c3

@@ -54,7 +54,7 @@ enum DivLayout {
 }
 
 // div element
-struct Div {
+struct ElemDiv {
 	DivLayout layout;
 	struct scroll {
 		bool can_x;
@@ -70,12 +70,12 @@ struct Div {
 }
 
 // slider element
-struct Slider {
+struct ElemSlider {
 	float value;
 	Rect handle;
 }
 
-struct Text {
+struct ElemText {
 	char* str;
 }
 
@@ -87,9 +87,9 @@ struct Elem {
 	Rect bounds;
 	ElemType type;
 	union {
-		Div div;
-		Slider slider;
-		Text text;
+		ElemDiv div;
+		ElemSlider slider;
+		ElemText text;
 	}
 }
 

src/ugui_font.c3

@@ -1,9 +1,12 @@
 module ugui;
 
 import schrift;
+import grapheme;
 import std::collections::map;
 import std::core::mem;
 import std::io;
+import std::ascii;
+
 
 // unicode code point, different type for a different hash
 def Codepoint = uint;
@@ -161,4 +164,50 @@ fn void Font.free(&font)
 fn void! Ctx.load_font(&ctx, String name, String path, uint height, float scale = 1.0)
 {
 	return ctx.font.load(name, path, height, scale);
+}
+
+<*
+@require off != null
+*>
+fn Codepoint str_to_codepoint(char[] str, usz* off)
+{
+	Codepoint cp;
+	isz b = grapheme::decode_utf8(str, str.len, &cp);
+	if (b == 0 || b > str.len) {
+		return 0;
+	}
+	*off = b;
+	return cp;
+}
+
+fn Rect! Ctx.get_text_bounds(&ctx, String text)
+{
+	Rect text_bounds;
+	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
+	short line_gap = (short)ctx.font.linegap;
+	text_bounds.h = line_height;
+	Glyph* gp;
+
+	// TODO: account for unicode codepoints
+	short line_len;
+	Codepoint cp;
+	usz off, x;
+	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
+		off += x;
+		bool n;
+		if (!ascii::is_cntrl((char)cp)) {
+			gp = ctx.font.get_glyph(cp)!;
+			line_len += gp.adv;
+		} else if (cp == '\n'){
+			text_bounds.h += line_height + line_gap;
+			line_len = 0;
+		} else {
+			continue;
+		}
+		if (line_len > text_bounds.w) {
+			text_bounds.w = line_len;
+		}
+	}
+
+	return text_bounds;
 }

src/ugui_layout.c3

@@ -86,7 +86,7 @@ fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, bool style = false)
 {
 	Rect placement;
 	Point origin;
-	Div* div = &parent.div;
+	ElemDiv* div = &parent.div;
 
 	// 1. Select the right origin
 	switch (div.layout) {

src/ugui_text.c3

@@ -1,54 +1,6 @@
 module ugui;
 
 import std::io;
-import std::ascii;
-import grapheme;
-
-<*
-@require off != null
-*>
-fn Codepoint str_to_codepoint(char[] str, usz* off)
-{
-	Codepoint cp;
-	isz b = grapheme::decode_utf8(str, str.len, &cp);
-	if (b == 0 || b > str.len) {
-		return 0;
-	}
-	*off = b;
-	return cp;
-}
-
-fn Rect! Ctx.get_text_bounds(&ctx, String text)
-{
-	Rect text_bounds;
-	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
-	short line_gap = (short)ctx.font.linegap;
-	text_bounds.h = line_height;
-	Glyph* gp;
-
-	// TODO: account for unicode codepoints
-	short line_len;
-	Codepoint cp;
-	usz off, x;
-	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
-		off += x;
-		bool n;
-		if (!ascii::is_cntrl((char)cp)) {
-			gp = ctx.font.get_glyph(cp)!;
-			line_len += gp.adv;
-		} else if (cp == '\n'){
-			text_bounds.h += line_height + line_gap;
-			line_len = 0;
-		} else {
-			continue;
-		}
-		if (line_len > text_bounds.w) {
-			text_bounds.w = line_len;
-		}
-	}
-
-	return text_bounds;
-}
 
 fn void! Ctx.text_unbounded(&ctx, String label, String text)
 {