imagebuf docs examples: c++ examples, outfile, run script, and doc (#3992) #4020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,13 @@ | ||
| findaverages.exr : 640 x 480, 3 channel, float openexr | ||
| SHA-1: E8D3C267CBC4BBDE41343DCA008773A3E55B8159 | ||
| set-region-black.exr : 640 x 480, 3 channel, float openexr | ||
| SHA-1: 7006ED82385E7BCD1FB338B9D3DBFF754541E980 | ||
| set-region-black-template-dispatch.exr : 640 x 480, 3 channel, half openexr | ||
| SHA-1: FEB8B385D8784C4A16F3164D9B1A0F9113D64C86 | ||
| set-region-black-template-float.exr : 640 x 480, 3 channel, float openexr | ||
| SHA-1: 7006ED82385E7BCD1FB338B9D3DBFF754541E980 | ||
| set-region-black-template-uint8.exr : 640 x 480, 3 channel, half openexr | ||
| SHA-1: 9E09138C84FC4FDA52A6D76AED751B6551BB3417 | ||
| error: Uninitialized input image | ||
| error: Uninitialized input image | ||
| zero1.exr : 512 x 512, 3 channel, float openexr | ||
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@@ -26,6 +26,12 @@ | |
| # hashes merely check that the images don't change, but saves us the space | ||
| # of checking in a full copy of the image if it's not needed. | ||
| hashes = [ | ||
| # Outputs from the ImageBuf chapter: | ||
| "findaverages.exr", | ||
| "set-region-black.exr", | ||
| "set-region-black-template-dispatch.exr", | ||
| "set-region-black-template-float.exr", | ||
| "set-region-black-template-uint8.exr", | ||
| # Outputs from the ImageBufAlgo chapter: | ||
| "zero1.exr", | ||
| "zero2.exr", | ||
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@@ -30,12 +30,215 @@ void example1() | |
| // | ||
| /////////////////////////////////////////////////////////////////////////// | ||
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| #include <OpenImageIO/imagebuf.h> | ||
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| // BEGIN-imagebuf-get-pixel-avg | ||
| void print_channel_averages(const std::string& filename) | ||
| { | ||
| // Set up the ImageBuf and read the file | ||
| ImageBuf buf(filename); | ||
| bool ok = buf.read(0, 0, true, TypeDesc::FLOAT); // Force a float buffer | ||
| if (!ok) | ||
| return; | ||
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| // Initialize a vector to contain the running total | ||
| int nc = buf.nchannels(); | ||
| std::vector<float> total(nc, 0.0f); | ||
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| // Iterate over all pixels of the image, summing channels separately | ||
| for (ImageBuf::ConstIterator<float> it(buf); !it.done(); ++it) | ||
| for (int c = 0; c < nc; ++c) | ||
| total[c] += it[c]; | ||
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| // Print the averages | ||
| imagesize_t npixels = buf.spec().image_pixels(); | ||
| for (int c = 0; c < nc; ++c) | ||
| std::cout << "Channel " << c << " avg = " << (total[c] / npixels) | ||
| << "\n"; | ||
| } | ||
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| // END-imagebuf-get-pixel-avg | ||
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| void print_channel_averages_example() | ||
| { | ||
| const std::string filename = "findaverages.exr"; | ||
| int x_sz = 640; | ||
| int y_sz = 480; | ||
| ImageBuf A(ImageSpec(x_sz, y_sz, 3, TypeDesc::FLOAT)); | ||
| for (int i = 0; i < x_sz; ++i) | ||
| for (int j = 0; j < y_sz; ++j) { | ||
| // Create a square RGB gradient so determining an average is interesting | ||
| A.setpixel(i, j, 0, | ||
| cspan<float>( | ||
| { powf(float(i) / (x_sz - 1), 2.0f), | ||
| powf(float(j) / (y_sz - 1), 2.0f), | ||
| powf(float(i * j) / (x_sz * y_sz - 1), 2.0f) })); | ||
| } | ||
| if (!A.write(filename)) { | ||
| std::cout << "error: " << A.geterror() << "\n"; | ||
| } else { | ||
| print_channel_averages(filename); | ||
| } | ||
| } | ||
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| // BEGIN-imagebuf-set-region-black | ||
| bool make_black(ImageBuf& buf, ROI region) | ||
| { | ||
| if (buf.spec().format != TypeDesc::FLOAT) | ||
| return false; // Assume it's a float buffer | ||
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| // Clamp the region's channel range to the channels in the image | ||
| region.chend = std::min(region.chend, buf.nchannels()); | ||
| // Iterate over all pixels in the region... | ||
| for (ImageBuf::Iterator<float> it(buf, region); !it.done(); ++it) { | ||
| if (!it.exists()) // Make sure the iterator is pointing | ||
| continue; // to a pixel in the data window | ||
| for (int c = region.chbegin; c < region.chend; ++c) | ||
| it[c] = 0.0f; // clear the value | ||
| } | ||
| return true; | ||
| } | ||
| // END-imagebuf-set-region-black | ||
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| void make_black_example() | ||
| { | ||
| int x_sz = 640; | ||
| int y_sz = 480; | ||
| ImageBuf A(ImageSpec(x_sz, y_sz, 3, TypeDesc::FLOAT)); | ||
| for (int i = 0; i < x_sz; ++i) | ||
| for (int j = 0; j < y_sz; ++j) { | ||
| // Create RGB gradient so region changing is easy to see | ||
| A.setpixel(i, j, 0, | ||
| cspan<float>({ float(i) / (x_sz - 1), | ||
| float(j) / (y_sz - 1), | ||
| float(i * j) / (x_sz * y_sz - 1) })); | ||
| } | ||
| // A rectangular region straddling the middle of the image above | ||
| ROI region(x_sz / 4, x_sz * 3 / 4, y_sz / 4, y_sz * 3 / 4, 0, 1, 0, 3); | ||
| if (make_black(A, region)) { | ||
| A.write("set-region-black.exr"); | ||
| } else { | ||
| std::cout << "error: buffer is not a float buffer\n"; | ||
| } | ||
| } | ||
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| // BEGIN-imagebuf-iterator-template | ||
| #include <OpenImageIO/half.h> | ||
| template<typename BUFT> | ||
| static bool make_black_impl(ImageBuf& buf, ROI region) | ||
| { | ||
| // Clamp the region's channel range to the channels in the image | ||
| region.chend = std::min(region.chend, buf.nchannels()); | ||
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| // Iterate over all pixels in the region... | ||
| for (ImageBuf::Iterator<BUFT> it(buf, region); !it.done(); ++it) { | ||
| if (!it.exists()) // Make sure the iterator is pointing | ||
| continue; // to a pixel in the data window | ||
| for (int c = region.chbegin; c < region.chend; ++c) | ||
| it[c] = 0.0f; // clear the value | ||
| } | ||
| return true; | ||
| } | ||
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| bool make_black_templated(ImageBuf& buf, ROI region) | ||
| { | ||
| if (buf.spec().format == TypeDesc::FLOAT) | ||
| return make_black_impl<float>(buf, region); | ||
| else if (buf.spec().format == TypeDesc::HALF) | ||
| return make_black_impl<half>(buf, region); | ||
| else if (buf.spec().format == TypeDesc::UINT8) | ||
| return make_black_impl<unsigned char>(buf, region); | ||
| else if (buf.spec().format == TypeDesc::UINT16) | ||
| return make_black_impl<unsigned short>(buf, region); | ||
| else { | ||
| buf.errorf("Unsupported pixel data format %s", | ||
| buf.spec().format.c_str()); | ||
| return false; | ||
| } | ||
| } | ||
| // END-imagebuf-iterator-template | ||
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| void make_black_template_example() | ||
| { | ||
| int x_sz = 640; | ||
| int y_sz = 480; | ||
| ImageBuf A(ImageSpec(x_sz, y_sz, 3, TypeDesc::FLOAT)); | ||
| for (int i = 0; i < x_sz; ++i) | ||
| for (int j = 0; j < y_sz; ++j) { | ||
| // Create RGB gradient so region changing is easy to see | ||
| A.setpixel(i, j, 0, | ||
| cspan<float>({ float(i) / (x_sz - 1), | ||
| float(j) / (y_sz - 1), | ||
| float(i * j) / (x_sz * y_sz - 1) })); | ||
| } | ||
| // A rectangular region straddling the middle of the image above | ||
| ROI region(x_sz / 4, x_sz * 3 / 4, y_sz / 4, y_sz * 3 / 4, 0, 1, 0, 3); | ||
| if (make_black_templated(A, region)) { | ||
| A.write("set-region-black-template-float.exr"); | ||
| } else { | ||
| std::cout << "error: " << A.geterror() << "\n"; | ||
| } | ||
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| ImageBuf B(ImageSpec(x_sz, y_sz, 3, TypeDesc::UINT8)); | ||
| for (int i = 0; i < x_sz; ++i) | ||
| for (int j = 0; j < y_sz; ++j) { | ||
| // Create RGB gradient so region changing is easy to see | ||
| B.setpixel(i, j, 0, | ||
| cspan<float>({ float(i) / (x_sz - 1), | ||
| float(j) / (y_sz - 1), | ||
| float(i * j) / (x_sz * y_sz - 1) })); | ||
| } | ||
| // A rectangular region straddling the middle of the image above | ||
| if (make_black_templated(B, region)) { | ||
| B.write("set-region-black-template-uint8.exr"); | ||
| } else { | ||
| std::cout << "error: " << B.geterror() << "\n"; | ||
| } | ||
| } | ||
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| // BEGIN-imagebuf-dispatch | ||
| #include <OpenImageIO/imagebufalgo_util.h> | ||
| bool make_black_dispatch(ImageBuf& buf, ROI region) | ||
| { | ||
| bool ok; | ||
| OIIO_DISPATCH_COMMON_TYPES(ok, "make_black_dispatch", make_black_impl, | ||
| buf.spec().format, buf, region); | ||
| return ok; | ||
| } | ||
| // END-imagebuf-dispatch | ||
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| void make_black_dispatch_example() | ||
| { | ||
| int x_sz = 640; | ||
| int y_sz = 480; | ||
| ImageBuf A(ImageSpec(x_sz, y_sz, 3, TypeDesc::UINT16)); | ||
| for (int i = 0; i < x_sz; ++i) | ||
| for (int j = 0; j < y_sz; ++j) { | ||
| // Create RGB gradient so region changing is easy to see | ||
| A.setpixel(i, j, 0, | ||
| cspan<float>({ float(i) / (x_sz - 1), | ||
| float(j) / (y_sz - 1), | ||
| float(i * j) / (x_sz * y_sz - 1) })); | ||
| } | ||
| // A rectangular region straddling the middle of the image above | ||
| ROI region(x_sz / 4, x_sz * 3 / 4, y_sz / 4, y_sz * 3 / 4, 0, 1, 0, 3); | ||
| if (make_black_templated(A, region)) { | ||
| A.write("set-region-black-template-dispatch.exr"); | ||
| } else { | ||
| std::cout << "error: " << A.geterror() << "\n"; | ||
| } | ||
| } | ||
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| int main(int /*argc*/, char** /*argv*/) | ||
| { | ||
| // Each example function needs to get called here, or it won't execute | ||
| // as part of the test. | ||
| // example1(); | ||
| print_channel_averages_example(); | ||
| make_black_example(); | ||
| make_black_template_example(); | ||
| make_black_dispatch_example(); | ||
| return 0; | ||
| } | ||
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In the C++ code, you called this BEGIN/END-imagebuf-get-pixel-avg