android – 如何使用具有多个输入分配的RenderScript？

最近,我发现渲染脚本是Android上图像处理的更好选择.表演很精彩.但是关于它的文件并不多.我想知道我是否可以通过渲染脚本将多张照片合并到结果照片中.

http://developer.android.com/guide/topics/renderscript/compute.html说：

A kernel may have an input Allocation, an output Allocation, or both. A kernel may not have more than one input or one output Allocation. If more than one input or output is required, those objects should be bound to rs_allocation script globals and accessed from a kernel or invokable function via rsGetElementAt_type() or rsSetElementAt_type().

这个问题有代码示例吗？

解决方法:

对于具有多个输入的内核,您必须手动处理其他输入.

假设您想要2个输入.

example.rs：

rs_allocation extra_alloc;

uchar4 __attribute__((kernel)) kernel(uchar4 i1, uint32_t x, uint32_t y)
{
    // Manually getting current element from the extra input
    uchar4 i2 = rsGetElementAt_uchar4(extra_alloc, x, y);
    // Now process i1 and i2 and generate out
    uchar4 out = ...;
    return out;
}

Java的：

Bitmap bitmapIn = ...;
Bitmap bitmapInExtra = ...;
Bitmap bitmapOut = Bitmap.createBitmap(bitmapIn.getWidth(),
                    bitmapIn.getHeight(), bitmapIn.getConfig());

RenderScript rs = RenderScript.create(this);
ScriptC_example script = new ScriptC_example(rs);

Allocation inAllocation = Allocation.createFromBitmap(rs, bitmapIn);
Allocation inAllocationExtra = Allocation.createFromBitmap(rs, bitmapInExtra);
Allocation outAllocation = Allocation.createFromBitmap(rs, bitmapOut);

// Execute this kernel on two inputs
script.set_extra_alloc(inAllocationExtra);
script.forEach_kernel(inAllocation, outAllocation);

// Get the data back into bitmap
outAllocation.copyTo(bitmapOut);

标签：android,renderscript
来源： https://codeday.me/bug/20190831/1773974.html