Image flip Raw data vertically (#2369)

* add new method * specify only RGBA8888 is supported * add return if wrong pixel format * fix indent * Use AXASSERT * Add back check for release * format using clang-format --------- Co-authored-by: Alexandre Konieczny <[email protected]>
axmolengine · Feb 7, 2025 · 0656f87 · 0656f87
1 parent fb850fd
commit 0656f87
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diff --git a/core/platform/Image.cpp b/core/platform/Image.cpp
@@ -748,6 +748,35 @@ bool Image::initWithRawData(const uint8_t* data,
     return ret;
 }
 
+void Image::flipRawData()
+{
+    AXASSERT(_pixelFormat == backend::PixelFormat::RGBA8, "only RGBA8888 can be flipped");
+    if (_pixelFormat != backend::PixelFormat::RGBA8)
+    {
+        AXLOGE("Cannot flip image. Unsupported pixel format.");
+        return;
+    }
+
+    uint8_t temp;
+    int idx1, idx2;
+
+    for (int w = 0; w < _width; w++)
+    {
+        for (int h = 0; h < _height / 2; h++)
+        {
+            idx1 = (h * _width + w) * 4;
+            idx2 = ((_height - h - 1) * _width + w) * 4;
+
+            for (int c = 0; c < 4; c++)
+            {
+                temp            = _data[idx1 + c];
+                _data[idx1 + c] = _data[idx2 + c];
+                _data[idx2 + c] = temp;
+            }
+        }
+    }
+}
+
 bool Image::isPng(const uint8_t* data, ssize_t dataLen)
 {
     if (dataLen <= 8)

diff --git a/core/platform/Image.h b/core/platform/Image.h
@@ -167,6 +167,9 @@ class AX_DLL Image : public Object
                          int bitsPerComponent,
                          bool preMulti = false);
 
+    // only RGBA8888 supported
+    void flipRawData();
+
     // Getters
     uint8_t* getData() { return _data + _offset; }
     ssize_t getDataLen() { return _dataLen - _offset; }