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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/test_image.h"
+
+#include <jxl/encode.h>
+
+#include <algorithm>
+#include <cstring>
+#include <utility>
+
+#include "lib/extras/dec/color_description.h"
+#include "lib/extras/dec/color_hints.h"
+#include "lib/extras/dec/decode.h"
+#include "lib/jxl/base/byte_order.h"
+#include "lib/jxl/base/random.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/color_encoding_internal.h"
+
+namespace jxl {
+namespace test {
+
+namespace {
+
+void StoreValue(float val, size_t bits_per_sample, JxlPixelFormat format,
+ uint8_t** out) {
+ const float mul = (1u << bits_per_sample) - 1;
+ if (format.data_type == JXL_TYPE_UINT8) {
+ **out = val * mul;
+ } else if (format.data_type == JXL_TYPE_UINT16) {
+ uint16_t uval = val * mul;
+ if (SwapEndianness(format.endianness)) {
+ uval = JXL_BSWAP16(uval);
+ }
+ memcpy(*out, &uval, 2);
+ } else if (format.data_type == JXL_TYPE_FLOAT) {
+ // TODO(szabadka) Add support for custom bits / exponent bits floats.
+ if (SwapEndianness(format.endianness)) {
+ val = BSwapFloat(val);
+ }
+ memcpy(*out, &val, 4);
+ } else {
+ // TODO(szabadka) Add support for FLOAT16.
+ }
+ *out += extras::PackedImage::BitsPerChannel(format.data_type) / 8;
+}
+
+void FillPackedImage(size_t bits_per_sample, uint16_t seed,
+ extras::PackedImage* image) {
+ const size_t xsize = image->xsize;
+ const size_t ysize = image->ysize;
+ const JxlPixelFormat format = image->format;
+
+ // Cause more significant image difference for successive seeds.
+ Rng generator(seed);
+
+ // Returns random integer in interval [0, max_value)
+ auto rngu = [&generator](size_t max_value) -> size_t {
+ return generator.UniformU(0, max_value);
+ };
+
+ // Returns random float in interval [0.0, max_value)
+ auto rngf = [&generator](float max_value) {
+ return generator.UniformF(0.0f, max_value);
+ };
+
+ // Dark background gradient color
+ float r0 = rngf(0.5f);
+ float g0 = rngf(0.5f);
+ float b0 = rngf(0.5f);
+ float a0 = rngf(0.5f);
+ float r1 = rngf(0.5f);
+ float g1 = rngf(0.5f);
+ float b1 = rngf(0.5f);
+ float a1 = rngf(0.5f);
+
+ // Circle with different color
+ size_t circle_x = rngu(xsize);
+ size_t circle_y = rngu(ysize);
+ size_t circle_r = rngu(std::min(xsize, ysize));
+
+ // Rectangle with random noise
+ size_t rect_x0 = rngu(xsize);
+ size_t rect_y0 = rngu(ysize);
+ size_t rect_x1 = rngu(xsize);
+ size_t rect_y1 = rngu(ysize);
+ if (rect_x1 < rect_x0) std::swap(rect_x0, rect_y1);
+ if (rect_y1 < rect_y0) std::swap(rect_y0, rect_y1);
+
+ // Create pixel content to test, actual content does not matter as long as it
+ // can be compared after roundtrip.
+ uint8_t* out = reinterpret_cast<uint8_t*>(image->pixels());
+ const float imul16 = 1.0f / 65536.0f;
+ for (size_t y = 0; y < ysize; y++) {
+ for (size_t x = 0; x < xsize; x++) {
+ float r = r0 * (ysize - y - 1) / ysize + r1 * y / ysize;
+ float g = g0 * (ysize - y - 1) / ysize + g1 * y / ysize;
+ float b = b0 * (ysize - y - 1) / ysize + b1 * y / ysize;
+ float a = a0 * (ysize - y - 1) / ysize + a1 * y / ysize;
+ // put some shape in there for visual debugging
+ if ((x - circle_x) * (x - circle_x) + (y - circle_y) * (y - circle_y) <
+ circle_r * circle_r) {
+ r = std::min(1.0f, ((65535 - x * y) ^ seed) * imul16);
+ g = std::min(1.0f, ((x << 8) + y + seed) * imul16);
+ b = std::min(1.0f, ((y << 8) + x * seed) * imul16);
+ a = std::min(1.0f, (32768 + x * 256 - y) * imul16);
+ } else if (x > rect_x0 && x < rect_x1 && y > rect_y0 && y < rect_y1) {
+ r = rngf(1.0f);
+ g = rngf(1.0f);
+ b = rngf(1.0f);
+ a = rngf(1.0f);
+ }
+ if (format.num_channels == 1) {
+ StoreValue(g, bits_per_sample, format, &out);
+ } else if (format.num_channels == 2) {
+ StoreValue(g, bits_per_sample, format, &out);
+ StoreValue(a, bits_per_sample, format, &out);
+ } else if (format.num_channels == 3) {
+ StoreValue(r, bits_per_sample, format, &out);
+ StoreValue(g, bits_per_sample, format, &out);
+ StoreValue(b, bits_per_sample, format, &out);
+ } else if (format.num_channels == 4) {
+ StoreValue(r, bits_per_sample, format, &out);
+ StoreValue(g, bits_per_sample, format, &out);
+ StoreValue(b, bits_per_sample, format, &out);
+ StoreValue(a, bits_per_sample, format, &out);
+ }
+ }
+ }
+}
+
+} // namespace
+
+std::vector<uint8_t> GetSomeTestImage(size_t xsize, size_t ysize,
+ size_t num_channels, uint16_t seed) {
+ // Cause more significant image difference for successive seeds.
+ Rng generator(seed);
+
+ // Returns random integer in interval [0, max_value)
+ auto rng = [&generator](size_t max_value) -> size_t {
+ return generator.UniformU(0, max_value);
+ };
+
+ // Dark background gradient color
+ uint16_t r0 = rng(32768);
+ uint16_t g0 = rng(32768);
+ uint16_t b0 = rng(32768);
+ uint16_t a0 = rng(32768);
+ uint16_t r1 = rng(32768);
+ uint16_t g1 = rng(32768);
+ uint16_t b1 = rng(32768);
+ uint16_t a1 = rng(32768);
+
+ // Circle with different color
+ size_t circle_x = rng(xsize);
+ size_t circle_y = rng(ysize);
+ size_t circle_r = rng(std::min(xsize, ysize));
+
+ // Rectangle with random noise
+ size_t rect_x0 = rng(xsize);
+ size_t rect_y0 = rng(ysize);
+ size_t rect_x1 = rng(xsize);
+ size_t rect_y1 = rng(ysize);
+ if (rect_x1 < rect_x0) std::swap(rect_x0, rect_y1);
+ if (rect_y1 < rect_y0) std::swap(rect_y0, rect_y1);
+
+ size_t num_pixels = xsize * ysize;
+ // 16 bits per channel, big endian, 4 channels
+ std::vector<uint8_t> pixels(num_pixels * num_channels * 2);
+ // Create pixel content to test, actual content does not matter as long as it
+ // can be compared after roundtrip.
+ for (size_t y = 0; y < ysize; y++) {
+ for (size_t x = 0; x < xsize; x++) {
+ uint16_t r = r0 * (ysize - y - 1) / ysize + r1 * y / ysize;
+ uint16_t g = g0 * (ysize - y - 1) / ysize + g1 * y / ysize;
+ uint16_t b = b0 * (ysize - y - 1) / ysize + b1 * y / ysize;
+ uint16_t a = a0 * (ysize - y - 1) / ysize + a1 * y / ysize;
+ // put some shape in there for visual debugging
+ if ((x - circle_x) * (x - circle_x) + (y - circle_y) * (y - circle_y) <
+ circle_r * circle_r) {
+ r = (65535 - x * y) ^ seed;
+ g = (x << 8) + y + seed;
+ b = (y << 8) + x * seed;
+ a = 32768 + x * 256 - y;
+ } else if (x > rect_x0 && x < rect_x1 && y > rect_y0 && y < rect_y1) {
+ r = rng(65536);
+ g = rng(65536);
+ b = rng(65536);
+ a = rng(65536);
+ }
+ size_t i = (y * xsize + x) * 2 * num_channels;
+ pixels[i + 0] = (r >> 8);
+ pixels[i + 1] = (r & 255);
+ if (num_channels >= 2) {
+ // This may store what is called 'g' in the alpha channel of a 2-channel
+ // image, but that's ok since the content is arbitrary
+ pixels[i + 2] = (g >> 8);
+ pixels[i + 3] = (g & 255);
+ }
+ if (num_channels >= 3) {
+ pixels[i + 4] = (b >> 8);
+ pixels[i + 5] = (b & 255);
+ }
+ if (num_channels >= 4) {
+ pixels[i + 6] = (a >> 8);
+ pixels[i + 7] = (a & 255);
+ }
+ }
+ }
+ return pixels;
+}
+
+TestImage::TestImage() {
+ SetChannels(3);
+ SetAllBitDepths(8);
+ SetColorEncoding("RGB_D65_SRG_Rel_SRG");
+}
+
+TestImage& TestImage::DecodeFromBytes(const PaddedBytes& bytes) {
+ ColorEncoding c_enc;
+ JXL_CHECK(
+ ConvertExternalToInternalColorEncoding(ppf_.color_encoding, &c_enc));
+ extras::ColorHints color_hints;
+ color_hints.Add("color_space", Description(c_enc));
+ JXL_CHECK(
+ extras::DecodeBytes(Span<const uint8_t>(bytes), color_hints, &ppf_));
+ return *this;
+}
+
+TestImage& TestImage::ClearMetadata() {
+ ppf_.metadata = extras::PackedMetadata();
+ return *this;
+}
+
+TestImage& TestImage::SetDimensions(size_t xsize, size_t ysize) {
+ if (xsize <= ppf_.info.xsize && ysize <= ppf_.info.ysize) {
+ for (auto& frame : ppf_.frames) {
+ CropLayerInfo(xsize, ysize, &frame.frame_info.layer_info);
+ CropImage(xsize, ysize, &frame.color);
+ for (auto& ec : frame.extra_channels) {
+ CropImage(xsize, ysize, &ec);
+ }
+ }
+ } else {
+ JXL_CHECK(ppf_.info.xsize == 0 && ppf_.info.ysize == 0);
+ }
+ ppf_.info.xsize = xsize;
+ ppf_.info.ysize = ysize;
+ return *this;
+}
+
+TestImage& TestImage::SetChannels(size_t num_channels) {
+ JXL_CHECK(ppf_.frames.empty());
+ JXL_CHECK(!ppf_.preview_frame);
+ ppf_.info.num_color_channels = num_channels < 3 ? 1 : 3;
+ ppf_.info.num_extra_channels = num_channels - ppf_.info.num_color_channels;
+ if (ppf_.info.num_extra_channels > 0 && ppf_.info.alpha_bits == 0) {
+ ppf_.info.alpha_bits = ppf_.info.bits_per_sample;
+ ppf_.info.alpha_exponent_bits = ppf_.info.exponent_bits_per_sample;
+ }
+ ppf_.extra_channels_info.clear();
+ for (size_t i = 1; i < ppf_.info.num_extra_channels; ++i) {
+ extras::PackedExtraChannel ec;
+ ec.index = i;
+ JxlEncoderInitExtraChannelInfo(JXL_CHANNEL_ALPHA, &ec.ec_info);
+ if (ec.ec_info.bits_per_sample == 0) {
+ ec.ec_info.bits_per_sample = ppf_.info.bits_per_sample;
+ ec.ec_info.exponent_bits_per_sample = ppf_.info.exponent_bits_per_sample;
+ }
+ ppf_.extra_channels_info.emplace_back(std::move(ec));
+ }
+ format_.num_channels = std::min(static_cast<size_t>(4), num_channels);
+ if (ppf_.info.num_color_channels == 1 &&
+ ppf_.color_encoding.color_space != JXL_COLOR_SPACE_GRAY) {
+ SetColorEncoding("Gra_D65_Rel_SRG");
+ }
+ return *this;
+}
+
+// Sets the same bit depth on color, alpha and all extra channels.
+TestImage& TestImage::SetAllBitDepths(uint32_t bits_per_sample,
+ uint32_t exponent_bits_per_sample) {
+ ppf_.info.bits_per_sample = bits_per_sample;
+ ppf_.info.exponent_bits_per_sample = exponent_bits_per_sample;
+ if (ppf_.info.num_extra_channels > 0) {
+ ppf_.info.alpha_bits = bits_per_sample;
+ ppf_.info.alpha_exponent_bits = exponent_bits_per_sample;
+ }
+ for (size_t i = 0; i < ppf_.extra_channels_info.size(); ++i) {
+ extras::PackedExtraChannel& ec = ppf_.extra_channels_info[i];
+ ec.ec_info.bits_per_sample = bits_per_sample;
+ ec.ec_info.exponent_bits_per_sample = exponent_bits_per_sample;
+ }
+ format_.data_type = DefaultDataType(ppf_.info);
+ return *this;
+}
+
+TestImage& TestImage::SetDataType(JxlDataType data_type) {
+ format_.data_type = data_type;
+ return *this;
+}
+
+TestImage& TestImage::SetEndianness(JxlEndianness endianness) {
+ format_.endianness = endianness;
+ return *this;
+}
+
+TestImage& TestImage::SetColorEncoding(const std::string& description) {
+ JXL_CHECK(ParseDescription(description, &ppf_.color_encoding));
+ ColorEncoding c_enc;
+ JXL_CHECK(
+ ConvertExternalToInternalColorEncoding(ppf_.color_encoding, &c_enc));
+ JXL_CHECK(c_enc.CreateICC());
+ PaddedBytes icc = c_enc.ICC();
+ ppf_.icc.assign(icc.begin(), icc.end());
+ return *this;
+}
+
+TestImage& TestImage::CoalesceGIFAnimationWithAlpha() {
+ extras::PackedFrame canvas = ppf_.frames[0].Copy();
+ JXL_CHECK(canvas.color.format.num_channels == 3);
+ JXL_CHECK(canvas.color.format.data_type == JXL_TYPE_UINT8);
+ JXL_CHECK(canvas.extra_channels.size() == 1);
+ for (size_t i = 1; i < ppf_.frames.size(); i++) {
+ const extras::PackedFrame& frame = ppf_.frames[i];
+ JXL_CHECK(frame.extra_channels.size() == 1);
+ const JxlLayerInfo& layer_info = frame.frame_info.layer_info;
+ extras::PackedFrame rendered = canvas.Copy();
+ uint8_t* pixels_rendered =
+ reinterpret_cast<uint8_t*>(rendered.color.pixels());
+ const uint8_t* pixels_frame =
+ reinterpret_cast<const uint8_t*>(frame.color.pixels());
+ uint8_t* alpha_rendered =
+ reinterpret_cast<uint8_t*>(rendered.extra_channels[0].pixels());
+ const uint8_t* alpha_frame =
+ reinterpret_cast<const uint8_t*>(frame.extra_channels[0].pixels());
+ for (size_t y = 0; y < frame.color.ysize; y++) {
+ for (size_t x = 0; x < frame.color.xsize; x++) {
+ size_t idx_frame = y * frame.color.xsize + x;
+ size_t idx_rendered = ((layer_info.crop_y0 + y) * rendered.color.xsize +
+ (layer_info.crop_x0 + x));
+ if (alpha_frame[idx_frame] != 0) {
+ memcpy(&pixels_rendered[idx_rendered * 3],
+ &pixels_frame[idx_frame * 3], 3);
+ alpha_rendered[idx_rendered] = alpha_frame[idx_frame];
+ }
+ }
+ }
+ if (layer_info.save_as_reference != 0) {
+ canvas = rendered.Copy();
+ }
+ ppf_.frames[i] = std::move(rendered);
+ }
+ return *this;
+}
+
+TestImage::Frame::Frame(TestImage* parent, bool is_preview, size_t index)
+ : parent_(parent), is_preview_(is_preview), index_(index) {}
+
+void TestImage::Frame::ZeroFill() {
+ memset(frame().color.pixels(), 0, frame().color.pixels_size);
+ for (auto& ec : frame().extra_channels) {
+ memset(ec.pixels(), 0, ec.pixels_size);
+ }
+}
+
+void TestImage::Frame::RandomFill(uint16_t seed) {
+ FillPackedImage(ppf().info.bits_per_sample, seed, &frame().color);
+ for (size_t i = 0; i < ppf().extra_channels_info.size(); ++i) {
+ FillPackedImage(ppf().extra_channels_info[i].ec_info.bits_per_sample,
+ seed + 1 + i, &frame().extra_channels[i]);
+ }
+}
+
+void TestImage::Frame::SetValue(size_t y, size_t x, size_t c, float val) {
+ const extras::PackedImage& color = frame().color;
+ JxlPixelFormat format = color.format;
+ JXL_CHECK(y < ppf().info.ysize);
+ JXL_CHECK(x < ppf().info.xsize);
+ JXL_CHECK(c < format.num_channels);
+ size_t pwidth = extras::PackedImage::BitsPerChannel(format.data_type) / 8;
+ size_t idx = ((y * color.xsize + x) * format.num_channels + c) * pwidth;
+ uint8_t* pixels = reinterpret_cast<uint8_t*>(frame().color.pixels());
+ uint8_t* p = pixels + idx;
+ StoreValue(val, ppf().info.bits_per_sample, frame().color.format, &p);
+}
+
+TestImage::Frame TestImage::AddFrame() {
+ size_t index = ppf_.frames.size();
+ extras::PackedFrame frame(ppf_.info.xsize, ppf_.info.ysize, format_);
+ for (size_t i = 0; i < ppf_.extra_channels_info.size(); ++i) {
+ JxlPixelFormat ec_format = {1, format_.data_type, format_.endianness, 0};
+ extras::PackedImage image(ppf_.info.xsize, ppf_.info.ysize, ec_format);
+ frame.extra_channels.emplace_back(std::move(image));
+ }
+ ppf_.frames.emplace_back(std::move(frame));
+ return Frame(this, false, index);
+}
+
+TestImage::Frame TestImage::AddPreview(size_t xsize, size_t ysize) {
+ extras::PackedFrame frame(xsize, ysize, format_);
+ for (size_t i = 0; i < ppf_.extra_channels_info.size(); ++i) {
+ JxlPixelFormat ec_format = {1, format_.data_type, format_.endianness, 0};
+ extras::PackedImage image(xsize, ysize, ec_format);
+ frame.extra_channels.emplace_back(std::move(image));
+ }
+ ppf_.preview_frame = make_unique<extras::PackedFrame>(std::move(frame));
+ return Frame(this, true, 0);
+}
+
+void TestImage::CropLayerInfo(size_t xsize, size_t ysize, JxlLayerInfo* info) {
+ if (info->crop_x0 < static_cast<ssize_t>(xsize)) {
+ info->xsize = std::min<size_t>(info->xsize, xsize - info->crop_x0);
+ } else {
+ info->xsize = 0;
+ }
+ if (info->crop_y0 < static_cast<ssize_t>(ysize)) {
+ info->ysize = std::min<size_t>(info->ysize, ysize - info->crop_y0);
+ } else {
+ info->ysize = 0;
+ }
+}
+
+void TestImage::CropImage(size_t xsize, size_t ysize,
+ extras::PackedImage* image) {
+ size_t new_stride = (image->stride / image->xsize) * xsize;
+ uint8_t* buf = reinterpret_cast<uint8_t*>(image->pixels());
+ for (size_t y = 0; y < ysize; ++y) {
+ memmove(&buf[y * new_stride], &buf[y * image->stride], new_stride);
+ }
+ image->xsize = xsize;
+ image->ysize = ysize;
+ image->stride = new_stride;
+ image->pixels_size = ysize * new_stride;
+}
+
+JxlDataType TestImage::DefaultDataType(const JxlBasicInfo& info) {
+ if (info.bits_per_sample == 16 && info.exponent_bits_per_sample == 5) {
+ return JXL_TYPE_FLOAT16;
+ } else if (info.exponent_bits_per_sample > 0 || info.bits_per_sample > 16) {
+ return JXL_TYPE_FLOAT;
+ } else if (info.bits_per_sample > 8) {
+ return JXL_TYPE_UINT16;
+ } else {
+ return JXL_TYPE_UINT8;
+ }
+}
+
+} // namespace test
+} // namespace jxl
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