Add overlap support for gfx_CopyRectangle

examples/library_examples/graphx/copy_rectangle_overlap/.gitignore

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+obj/
+bin/
+src/gfx/*.c
+src/gfx/*.h
+src/gfx/*.8xv
+.DS_Store
+convimg.yaml.lst

examples/library_examples/graphx/copy_rectangle_overlap/autotest.json

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+{
+  "transfer_files":
+  [
+    "bin/DEMO.8xp"
+  ],
+  "target":
+  {
+    "name": "DEMO",
+    "isASM": true
+  },
+  "sequence":
+  [
+    "action|launch",
+    "delay|300",
+    "hashWait|1",
+    "key|enter",
+    "hashWait|2",
+    "key|enter",
+    "hashWait|3",
+    "key|enter",
+    "hashWait|4",
+    "key|enter",
+    "hashWait|5"
+  ],
+  "hashes":
+  {
+    "1":
+    {
+      "description": "Horizontal overlap right",
+      "start": "vram_start",
+      "size": "vram_8_size",
+      "expected_CRCs": [ "9D4993C1" ]
+    },
+    "2":
+    {
+      "description": "Horizontal overlap left",
+      "start": "vram_start",
+      "size": "vram_8_size",
+      "expected_CRCs": [ "BBD76F1C" ]
+    },
+    "3":
+    {
+      "description": "Vertical overlap down",
+      "start": "vram_start",
+      "size": "vram_8_size",
+      "expected_CRCs": [ "7C8FC7BE" ]
+    },
+    "4":
+    {
+      "description": "Vertical overlap up",
+      "start": "vram_start",
+      "size": "vram_8_size",
+      "expected_CRCs": [ "1C46A70A" ]
+    },
+    "5":
+    {
+      "description": "Test program exit",
+      "start": "vram_start",
+      "size": "vram_16_size",
+      "expected_CRCs": [ "FFAF89BA", "101734A5", "9DA19F44", "A32840C8", "349F4775" ]
+    }
+  }
+}

examples/library_examples/graphx/copy_rectangle_overlap/makefile

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+# ----------------------------
+# Makefile Options
+# ----------------------------
+
+NAME = DEMO
+ICON = icon.png
+DESCRIPTION = "CE C Toolchain Demo"
+COMPRESSED = NO
+
+CFLAGS = -Wall -Wextra -Oz
+CXXFLAGS = -Wall -Wextra -Oz
+
+# ----------------------------
+
+include $(shell cedev-config --makefile)

examples/library_examples/graphx/copy_rectangle_overlap/readme.md

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+### Copy Rectangle Overlap Demo
+
+This example demonstrates `gfx_CopyRectangle` on overlapping regions of the same buffer.
+It shows horizontal and vertical moves in both directions using memmove-like behavior.

examples/library_examples/graphx/copy_rectangle_overlap/src/main.c

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+#include <stdint.h>
+#include <graphx.h>
+#include <ti/getcsc.h>
+
+static void draw_base_pattern(void)
+{
+    uint8_t stripe;
+
+    gfx_FillScreen(239);
+
+    gfx_SetColor(26);
+    gfx_FillRectangle_NoClip(0, 0, GFX_LCD_WIDTH, 14);
+    gfx_SetColor(27);
+    gfx_FillRectangle_NoClip(0, GFX_LCD_HEIGHT - 12, GFX_LCD_WIDTH, 12);
+
+    for (stripe = 0; stripe < 6; stripe++)
+    {
+        static const uint8_t colors[6] = { 224, 9, 27, 56, 186, 250 };
+        uint24_t x = 24 + stripe * 40;
+
+        gfx_SetColor(colors[stripe]);
+        gfx_FillRectangle_NoClip(x, 24, 40, 120);
+
+        gfx_SetColor(0);
+        gfx_VertLine_NoClip(x, 24, 120);
+        gfx_VertLine_NoClip(x + 39, 24, 120);
+
+        gfx_SetColor(255);
+        gfx_FillRectangle_NoClip(x + 6, 34 + stripe * 12, 28, 6);
+        gfx_FillRectangle_NoClip(x + 6, 108 - stripe * 10, 28, 6);
+    }
+
+    gfx_SetColor(0);
+    gfx_Rectangle_NoClip(23, 23, 241, 121);
+
+    gfx_SetTextFGColor(255);
+    gfx_SetTextBGColor(26);
+    gfx_PrintStringXY("gfx_CopyRectangle overlap demo", 6, 3);
+
+    gfx_SetTextFGColor(255);
+    gfx_SetTextBGColor(27);
+    gfx_PrintStringXY("Black border = SRC   White border = DST", 6, GFX_LCD_HEIGHT - 10);
+}
+
+static void draw_overlay(const char *title,
+                         uint24_t src_x,
+                         uint8_t src_y,
+                         uint24_t dst_x,
+                         uint8_t dst_y,
+                         uint24_t width,
+                         uint8_t height)
+{
+    gfx_SetColor(0);
+    gfx_Rectangle_NoClip(src_x - 1, src_y - 1, width + 2, height + 2);
+
+    gfx_SetColor(255);
+    gfx_Rectangle_NoClip(dst_x - 1, dst_y - 1, width + 2, height + 2);
+
+    gfx_SetColor(255);
+    gfx_FillRectangle_NoClip(src_x + 2, src_y + 2, 24, 10);
+    gfx_SetColor(0);
+    gfx_Rectangle_NoClip(src_x + 2, src_y + 2, 24, 10);
+    gfx_SetTextFGColor(0);
+    gfx_SetTextBGColor(255);
+    gfx_PrintStringXY("SRC", src_x + 4, src_y + 3);
+
+    gfx_SetColor(255);
+    gfx_FillRectangle_NoClip(dst_x + 2, dst_y + 2, 24, 10);
+    gfx_SetColor(0);
+    gfx_Rectangle_NoClip(dst_x + 2, dst_y + 2, 24, 10);
+    gfx_SetTextFGColor(0);
+    gfx_SetTextBGColor(255);
+    gfx_PrintStringXY("DST", dst_x + 4, dst_y + 3);
+
+    gfx_SetColor(52);
+    gfx_FillRectangle_NoClip(188, 2, 130, 10);
+    gfx_SetTextFGColor(255);
+    gfx_SetTextBGColor(52);
+    gfx_PrintStringXY(title, 192, 3);
+}
+
+static void show_stage(void)
+{
+    gfx_BlitBuffer();
+    while (!os_GetCSC())
+    {
+    }
+}
+
+int main(void)
+{
+    gfx_Begin();
+    gfx_SetDrawBuffer();
+
+    draw_base_pattern();
+    gfx_CopyRectangle(gfx_buffer, gfx_buffer, 24, 18, 72, 18, 180, 64);
+    draw_overlay("Move right", 24, 18, 72, 18, 180, 64);
+    show_stage();
+
+    draw_base_pattern();
+    gfx_CopyRectangle(gfx_buffer, gfx_buffer, 72, 18, 24, 18, 180, 64);
+    draw_overlay("Move left", 72, 18, 24, 18, 180, 64);
+    show_stage();
+
+    draw_base_pattern();
+    gfx_CopyRectangle(gfx_buffer, gfx_buffer, 30, 24, 30, 60, 128, 96);
+    draw_overlay("Move down", 30, 24, 30, 60, 128, 96);
+    show_stage();
+
+    draw_base_pattern();
+    gfx_CopyRectangle(gfx_buffer, gfx_buffer, 30, 60, 30, 24, 128, 96);
+    draw_overlay("Move up", 30, 60, 30, 24, 128, 96);
+    show_stage();
+
+    gfx_End();
+
+    return 0;
+}