feat(gui): add canvas widget

include/LCUI/gui/widget/canvas.h

@@ -0,0 +1,62 @@
+/*
+ * canvas.h -- canvas, used to draw custom graphics
+ *
+ * Copyright (c) 2019, Liu chao <lc-soft@live.cn> All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of LCUI nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LCUI_CANVAS_H
+#define LCUI_CANVAS_H
+
+LCUI_BEGIN_HEADER
+
+typedef struct LCUI_CanvasRenderingContextRec_ LCUI_CanvasRenderingContextRec;
+typedef struct LCUI_CanvasRenderingContextRec_ *LCUI_CanvasRenderingContext;
+typedef LCUI_CanvasRenderingContext LCUI_CanvasContext;
+
+struct LCUI_CanvasRenderingContextRec_ {
+	LCUI_BOOL available;
+	LCUI_Color fill_color;
+	LCUI_Graph buffer;
+	LCUI_Widget canvas;
+	LinkedListNode node;
+
+	float scale;
+	int width;
+	int height;
+
+	void (*fillRect)(LCUI_CanvasContext, int, int, int, int);
+	void (*clearRect)(LCUI_CanvasContext, int, int, int, int);
+	void (*release)(LCUI_CanvasContext);
+};
+
+LCUI_API LCUI_CanvasContext Canvas_GetContext(LCUI_Widget w);
+
+void LCUIWidget_AddCanvas(void);
+
+LCUI_END_HEADER
+
+#endif

src/gui/Makefile.am

@@ -31,4 +31,5 @@ widget/textedit.c	\
 widget/sidebar.c	\
 widget/scrollbar.c	\
 widget/anchor.c		\
-widget/button.c
+widget/button.c		\
+widget/canvas.c

src/gui/widget.c

@@ -32,6 +32,7 @@
 #include <LCUI_Build.h>
 #include <LCUI/LCUI.h>
 #include <LCUI/gui/widget.h>
+#include <LCUI/gui/widget/canvas.h>
 #include <LCUI/gui/widget/textview.h>
 #include <LCUI/gui/widget/textcaret.h>
 #include <LCUI/gui/widget/textedit.h>
@@ -49,6 +50,7 @@ void LCUI_InitWidget(void)
 	LCUIWidget_InitRenderer();
 	LCUIWidget_InitImageLoader();
 	LCUIWidget_AddTextView();
+	LCUIWidget_AddCanvas();
 	LCUIWidget_AddAnchor();
 	LCUIWidget_AddButton();
 	LCUIWidget_AddSideBar();

src/gui/widget/canvas.c

@@ -0,0 +1,182 @@
+/*
+ * canvas.c -- canvas, used to draw custom graphics
+ *
+ * Copyright (c) 2019, Liu chao <lc-soft@live.cn> All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of LCUI nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <LCUI_Build.h>
+#include <LCUI/LCUI.h>
+#include <LCUI/gui/widget.h>
+#include <LCUI/gui/metrics.h>
+#include <LCUI/gui/widget/canvas.h>
+
+typedef struct CanvasRec_ {
+	LCUI_Graph buffer;
+	LinkedList contexts;
+} CanvasRec, *Canvas;
+
+struct {
+	LCUI_WidgetPrototype proto;
+} self;
+
+static void Canvas_OnResize(LCUI_Widget w, LCUI_WidgetEvent e, void *arg)
+{
+	float scale = LCUIMetrics_GetScale();
+	unsigned width = (unsigned)(w->box.content.width * scale);
+	unsigned height = (unsigned)(w->box.content.height * scale);
+
+	LCUI_Graph buffer;
+	Canvas canvas = Widget_GetData(w, self.proto);
+
+	Graph_Init(&buffer);
+	buffer.color_type = LCUI_COLOR_TYPE_ARGB;
+	Graph_Create(&buffer, width, height);
+	Graph_Replace(&buffer, &canvas->buffer, 0, 0);
+	Graph_Free(&canvas->buffer);
+	canvas->buffer = buffer;
+}
+
+static void Canvas_OnInit(LCUI_Widget w)
+{
+	Canvas canvas = Widget_AddData(w, self.proto, sizeof(CanvasRec));
+
+	Graph_Init(&canvas->buffer);
+	LinkedList_Init(&canvas->contexts);
+	Widget_BindEventById(w, LCUI_WEVENT_RESIZE, Canvas_OnResize, NULL,
+			     NULL);
+}
+
+static void Canvas_OnDestroy(LCUI_Widget w)
+{
+	LinkedListNode *node;
+	LCUI_CanvasContext ctx;
+	Canvas canvas = Widget_AddData(w, self.proto, sizeof(CanvasRec));
+
+	for (LinkedList_Each(node, &canvas->contexts)) {
+		ctx = node->data;
+		ctx->available = FALSE;
+	}
+	LinkedList_ClearData(&canvas->contexts, NULL);
+	Graph_Free(&canvas->buffer);
+}
+
+static void Canvas_AutoSize(LCUI_Widget w, float *width, float *height)
+{
+	*width = 300;
+	*height = 150;
+}
+
+static void Canvas_OnPaint(LCUI_Widget w, LCUI_PaintContext paint,
+			   LCUI_WidgetActualStyle style)
+{
+	LCUI_Graph src, dest;
+	LCUI_Rect content_rect, rect;
+	Canvas canvas = Widget_GetData(w, self.proto);
+
+	content_rect.width = style->content_box.width;
+	content_rect.height = style->content_box.height;
+	content_rect.x = style->content_box.x - style->canvas_box.x;
+	content_rect.y = style->content_box.y - style->canvas_box.y;
+	if (!LCUIRect_GetOverlayRect(&content_rect, &paint->rect, &rect)) {
+		return;
+	}
+	content_rect.x = rect.x - content_rect.x;
+	content_rect.y = rect.y - content_rect.y;
+	content_rect.width = rect.width;
+	content_rect.height = rect.height;
+	rect.x -= paint->rect.x;
+	rect.y -= paint->rect.y;
+	Graph_Quote(&dest, &paint->canvas, &rect);
+	Graph_Quote(&src, &canvas->buffer, &content_rect);
+	Graph_Replace(&dest, &src, 0, 0);
+}
+
+static void CanvasContext_ClearRect(LCUI_CanvasContext ctx, int x, int y,
+				    int width, int height)
+{
+	LCUI_Rect rect;
+
+	rect.x = x;
+	rect.y = y;
+	rect.width = width;
+	rect.height = height;
+	Graph_FillRect(&ctx->buffer, ARGB(0, 0, 0, 0), &rect, TRUE);
+}
+
+static void CanvasContext_FillRect(LCUI_CanvasContext ctx, int x, int y,
+				   int width, int height)
+{
+	LCUI_Rect rect;
+
+	rect.x = x;
+	rect.y = y;
+	rect.width = width;
+	rect.height = height;
+	Graph_FillRect(&ctx->buffer, ctx->fill_color, &rect, TRUE);
+}
+
+static void CanvasContext_Release(LCUI_CanvasContext ctx)
+{
+	Canvas canvas;
+
+	if (ctx->available) {
+		canvas = Widget_GetData(ctx->canvas, self.proto);
+		LinkedList_Unlink(&canvas->contexts, &ctx->node);
+	}
+	free(ctx);
+}
+
+LCUI_CanvasContext Canvas_GetContext(LCUI_Widget w)
+{
+	ASSIGN(ctx, LCUI_CanvasRenderingContext);
+	Canvas canvas = Widget_GetData(w, self.proto);
+
+	ctx->canvas = w;
+	ctx->available = TRUE;
+	ctx->buffer = canvas->buffer;
+	ctx->width = ctx->buffer.width;
+	ctx->height = ctx->buffer.height;
+	ctx->fill_color = RGB(0, 0, 0);
+	ctx->scale = LCUIMetrics_GetScale();
+	ctx->clearRect = CanvasContext_ClearRect;
+	ctx->fillRect = CanvasContext_FillRect;
+	ctx->release = CanvasContext_Release;
+	ctx->node.data = ctx;
+	ctx->node.next = ctx->node.prev = NULL;
+	LinkedList_AppendNode(&canvas->contexts, &ctx->node);
+	return ctx;
+}
+
+void LCUIWidget_AddCanvas(void)
+{
+	self.proto = LCUIWidget_NewPrototype("canvas", NULL);
+	self.proto->init = Canvas_OnInit;
+	self.proto->destroy = Canvas_OnDestroy;
+	self.proto->paint = Canvas_OnPaint;
+	self.proto->autosize = Canvas_AutoSize;
+}

test/Makefile.am

@@ -1,6 +1,6 @@
-AUTOMAKE_OPTIONS=foreign
+AUTOMAKE_OPTIONS=subdir-objects foreign
 ##设定在编译时头文件的查找位置
-AM_CFLAGS = -I$(top_builddir)/include $(CODE_COVERAGE_CFLAGS)
+AM_CFLAGS = -I$(top_srcdir)/include $(CODE_COVERAGE_CFLAGS)
 ##需要编译的测试程序, noinst指的是不安装
 noinst_PROGRAMS = helloworld test test_charset test_touch test_char_render \
 test_string_render test_widget_render test_widget_layout  test_widget_rect \