image: Implement --scale argument to scale image to framebuffer

Also fix bug where red and blue channels were flipped

BAN/include/BAN/Math.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <BAN/Limits.h>
 #include <BAN/Traits.h>
 
 #include <stddef.h>
@@ -65,6 +66,27 @@ namespace BAN::Math
 		return (value & (value - 1)) == 0;
 	}
 
+	template<BAN::integral T>
+	static constexpr bool will_multiplication_overflow(T a, T b)
+	{
+		if (a == 0 || b == 0)
+			return false;
+		if ((a > 0) == (b > 0))
+			return a > BAN::numeric_limits<T>::max() / b;
+		else
+			return a < BAN::numeric_limits<T>::min() / b;
+	}
+
+	template<BAN::integral T>
+	static constexpr bool will_addition_overflow(T a, T b)
+	{
+		if (a > 0 && b > 0)
+			return a > BAN::numeric_limits<T>::max() - b;
+		if (a < 0 && b < 0)
+			return a < BAN::numeric_limits<T>::min() - b;
+		return false;
+	}
+
 	template<typename T>
 	requires is_same_v<T, unsigned int> || is_same_v<T, unsigned long> || is_same_v<T, unsigned long long>
 	inline constexpr T ilog2(T value)

CMakeLists.txt

@@ -23,6 +23,7 @@ add_subdirectory(libc)
 add_subdirectory(LibELF)
 add_subdirectory(LibFont)
 add_subdirectory(LibGUI)
+add_subdirectory(LibImage)
 add_subdirectory(LibInput)
 add_subdirectory(userspace)
 
@@ -38,6 +39,7 @@ add_custom_target(headers
 	DEPENDS libelf-headers
 	DEPENDS libfont-headers
 	DEPENDS libgui-headers
+	DEPENDS libimage-headers
 	DEPENDS libinput-headers
 )
 
@@ -49,6 +51,7 @@ add_custom_target(install-sysroot
 	DEPENDS libelf-install
 	DEPENDS libfont-install
 	DEPENDS libgui-install
+	DEPENDS libimage-install
 	DEPENDS libinput-install
 )
 

LibImage/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(libimage CXX)
+
+set(LIBIMAGE_SOURCES
+	Image.cpp
+	Netbpm.cpp
+)
+
+add_custom_target(libimage-headers
+	COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	DEPENDS sysroot
+)
+
+add_library(libimage ${LIBIMAGE_SOURCES})
+add_dependencies(libimage headers libc-install)
+target_link_libraries(libimage PUBLIC libc)
+
+add_custom_target(libimage-install
+	COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_BINARY_DIR}/libimage.a ${BANAN_LIB}/
+	DEPENDS libimage
+	BYPRODUCTS ${BANAN_LIB}/libimage.a
+)
+
+set(CMAKE_STATIC_LIBRARY_PREFIX "")

LibImage/Image.cpp

@@ -0,0 +1,139 @@
+#include <BAN/ScopeGuard.h>
+#include <BAN/String.h>
+
+#include <LibImage/Image.h>
+#include <LibImage/Netbpm.h>
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+
+namespace LibImage
+{
+
+	BAN::ErrorOr<BAN::UniqPtr<Image>> Image::load_from_file(BAN::StringView path)
+	{
+		int fd = -1;
+
+		if (path.data()[path.size()] == '\0')
+		{
+			fd = open(path.data(), O_RDONLY);
+		}
+		else
+		{
+			BAN::String path_str;
+			TRY(path_str.append(path));
+			fd = open(path_str.data(), O_RDONLY);
+		}
+
+		if (fd == -1)
+		{
+			fprintf(stddbg, "open: %s\n", strerror(errno));
+			return BAN::Error::from_errno(errno);
+		}
+
+		BAN::ScopeGuard guard_file_close([fd] { close(fd); });
+
+		struct stat st;
+		if (fstat(fd, &st) == -1)
+		{
+			fprintf(stddbg, "fstat: %s\n", strerror(errno));
+			return BAN::Error::from_errno(errno);
+		}
+
+		if (st.st_size < 2)
+		{
+			fprintf(stddbg, "invalid image (too small)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		void* addr = mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+		if (addr == MAP_FAILED)
+		{
+			fprintf(stddbg, "mmap: %s\n", strerror(errno));
+			return BAN::Error::from_errno(errno);
+		}
+
+		BAN::ScopeGuard guard_munmap([&] { munmap(addr, st.st_size); });
+
+		auto image_data_span = BAN::ConstByteSpan(reinterpret_cast<uint8_t*>(addr), st.st_size);
+
+		uint16_t u16_signature = image_data_span.as<const uint16_t>();
+		switch (u16_signature)
+		{
+			case 0x3650:
+			case 0x3550:
+			case 0x3450:
+			case 0x3350:
+			case 0x3250:
+			case 0x3150:
+				return TRY(load_netbpm(image_data_span));
+			default:
+				fprintf(stderr, "unrecognized image format\n");
+				break;
+		}
+
+		return BAN::Error::from_errno(ENOTSUP);
+	}
+
+	BAN::ErrorOr<BAN::UniqPtr<Image>> Image::resize(uint64_t new_width, uint64_t new_height, ResizeAlgorithm algorithm)
+	{
+		if (!validate_size(new_width, new_height))
+			return BAN::Error::from_errno(EOVERFLOW);
+
+		const double ratio_x = (double)width() / new_width;
+		const double ratio_y = (double)height() / new_height;
+
+		switch (algorithm)
+		{
+			case ResizeAlgorithm::Nearest:
+			{
+				BAN::Vector<Color> nearest_bitmap;
+				TRY(nearest_bitmap.resize(new_width * new_height));
+
+				for (uint64_t y = 0; y < new_height; y++)
+				{
+					for (uint64_t x = 0; x < new_width; x++)
+					{
+						const uint64_t nearest_x = BAN::Math::clamp<uint64_t>(x * ratio_x, 0, width() - 1);
+						const uint64_t nearest_y = BAN::Math::clamp<uint64_t>(y * ratio_y, 0, height() - 1);
+						nearest_bitmap[y * new_width + x] = get_color(nearest_x, nearest_y);
+					}
+				}
+
+				return TRY(BAN::UniqPtr<Image>::create(new_width, new_height, BAN::move(nearest_bitmap)));
+			}
+			case ResizeAlgorithm::Bilinear:
+			{
+				BAN::Vector<Color> bilinear_bitmap;
+				TRY(bilinear_bitmap.resize(new_width * new_height));
+
+				for (uint64_t y = 0; y < new_height; y++)
+				{
+					for (uint64_t x = 0; x < new_width; x++)
+					{
+						const double src_x_float = x * ratio_x;
+						const double src_y_float = y * ratio_y;
+						const double weight_x = src_x_float - floor(src_x_float);
+						const double weight_y = src_y_float - floor(src_y_float);
+
+						const uint64_t src_l = BAN::Math::clamp<uint64_t>(src_x_float, 0, width() - 1);
+						const uint64_t src_t = BAN::Math::clamp<uint64_t>(src_y_float, 0, height() - 1);
+
+						const uint64_t src_r = BAN::Math::clamp<uint64_t>(src_l + 1, 0, width() - 1);
+						const uint64_t src_b = BAN::Math::clamp<uint64_t>(src_t + 1, 0, height() - 1);
+
+						const Color avg_t = Color::average(get_color(src_l, src_t), get_color(src_r, src_t), weight_x);
+						const Color avg_b = Color::average(get_color(src_l, src_b), get_color(src_r, src_b), weight_x);
+						bilinear_bitmap[y * new_width + x] = Color::average(avg_t, avg_b, weight_y);
+					}
+				}
+
+				return TRY(BAN::UniqPtr<Image>::create(new_width, new_height, BAN::move(bilinear_bitmap)));
+			}
+		}
+
+		return BAN::Error::from_errno(EINVAL);
+	}
+
+}

LibImage/Netbpm.cpp

@@ -0,0 +1,120 @@
+#include <BAN/Optional.h>
+
+#include <LibImage/Netbpm.h>
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdio.h>
+
+namespace LibImage
+{
+
+	static BAN::Optional<uint64_t> parse_u64(BAN::ConstByteSpan& data)
+	{
+		size_t digit_count = 0;
+		while (digit_count < data.size() && isdigit(data[digit_count]))
+			digit_count++;
+		if (digit_count == 0)
+			return {};
+
+		uint64_t result = 0;
+		for (size_t i = 0; i < digit_count; i++)
+		{
+			if (BAN::Math::will_multiplication_overflow<uint64_t>(result, 10))
+				return {};
+			result *= 10;
+
+			if (BAN::Math::will_addition_overflow<uint64_t>(result, data[i] - '0'))
+				return {};
+			result += data[i] - '0';
+		}
+
+		data = data.slice(digit_count);
+
+		return result;
+	}
+
+	BAN::ErrorOr<BAN::UniqPtr<Image>> load_netbpm(BAN::ConstByteSpan image_data)
+	{
+		if (image_data.size() < 11)
+		{
+			fprintf(stddbg, "invalid Netbpm image (too small)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (image_data[0] != 'P')
+		{
+			fprintf(stddbg, "not Netbpm image\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		if (image_data[1] != '6')
+		{
+			fprintf(stddbg, "unsupported Netbpm image\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		if (image_data[2] != '\n')
+		{
+			fprintf(stddbg, "invalid Netbpm image (invalid header)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		image_data = image_data.slice(3);
+
+		auto opt_width = parse_u64(image_data);
+		if (!opt_width.has_value() || image_data[0] != ' ')
+		{
+			fprintf(stddbg, "invalid Netbpm image (invalid width)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		image_data = image_data.slice(1);
+		auto width = opt_width.value();
+
+		auto opt_height = parse_u64(image_data);
+		if (!opt_height.has_value() || image_data[0] != '\n')
+		{
+			fprintf(stddbg, "invalid Netbpm image (invalid height)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		image_data = image_data.slice(1);
+		auto height = opt_height.value();
+
+		if (!Image::validate_size(width, height))
+		{
+			fprintf(stddbg, "invalid Netbpm image size\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		auto header_end = parse_u64(image_data);
+		if (!header_end.has_value() || *header_end != 255 || image_data[0] != '\n')
+		{
+			fprintf(stddbg, "invalid Netbpm image (invalid header end)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		image_data = image_data.slice(1);
+
+		if (image_data.size() < width * height * 3)
+		{
+			fprintf(stddbg, "invalid Netbpm image (too small file size)\n");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		BAN::Vector<Image::Color> bitmap;
+		TRY(bitmap.resize(width * height));
+
+		// Fill bitmap
+		for (uint64_t y = 0; y < height; y++)
+		{
+			for (uint64_t x = 0; x < width; x++)
+			{
+				const uint64_t index = y * width + x;
+				auto& pixel = bitmap[index];
+				pixel.r = image_data[index * 3 + 0];
+				pixel.g = image_data[index * 3 + 1];
+				pixel.b = image_data[index * 3 + 2];
+				pixel.a = 0xFF;
+			}
+		}
+
+		return TRY(BAN::UniqPtr<Image>::create(width, height, BAN::move(bitmap)));
+	}
+
+}

LibImage/include/LibImage/Image.h

@@ -0,0 +1,85 @@
+#pragma once
+
+#include <BAN/Limits.h>
+#include <BAN/StringView.h>
+#include <BAN/UniqPtr.h>
+#include <BAN/Vector.h>
+
+namespace LibImage
+{
+
+	class Image
+	{
+	public:
+		struct Color
+		{
+			uint8_t r;
+			uint8_t g;
+			uint8_t b;
+			uint8_t a;
+
+			// Calculate weighted average of colors
+			//   weight of 0.0 returns a and weight of 1.0 returns b
+			static Color average(Color a, Color b, double weight)
+			{
+				const double b_mult = BAN::Math::clamp(weight, 0.0, 1.0);
+				const double a_mult = 1.0 - b_mult;
+				return Color {
+					.r = static_cast<uint8_t>(a.r * a_mult + b.r * b_mult),
+					.g = static_cast<uint8_t>(a.g * a_mult + b.g * b_mult),
+					.b = static_cast<uint8_t>(a.b * a_mult + b.b * b_mult),
+					.a = static_cast<uint8_t>(a.a * a_mult + b.a * b_mult),
+				};
+			}
+		};
+
+		enum class ResizeAlgorithm
+		{
+			Nearest,
+			Bilinear,
+		};
+
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<Image>> load_from_file(BAN::StringView path);
+
+		BAN::ErrorOr<BAN::UniqPtr<Image>> resize(uint64_t new_width, uint64_t new_height, ResizeAlgorithm = ResizeAlgorithm::Bilinear);
+
+		Color get_color(uint64_t x, uint64_t y) const { return m_bitmap[y * width() + x]; }
+		const BAN::Vector<Color> bitmap() const { return m_bitmap; }
+
+		uint64_t width() const { return m_width; }
+		uint64_t height() const { return m_height; }
+
+		static constexpr bool validate_size(uint64_t width, uint64_t height)
+		{
+			// width and height must fit in int64_t and width * height * sizeof(Color) has to not overflow
+			if (width > static_cast<uint64_t>(BAN::numeric_limits<int64_t>::max()))
+				return false;
+			if (height > static_cast<uint64_t>(BAN::numeric_limits<int64_t>::max()))
+				return false;
+			if (BAN::Math::will_multiplication_overflow(width, height))
+				return false;
+			if (BAN::Math::will_multiplication_overflow(width * height, sizeof(Color)))
+				return false;
+			return true;
+		}
+
+	private:
+		Image(uint64_t width, uint64_t height, BAN::Vector<Color>&& bitmap)
+			: m_width(width)
+			, m_height(height)
+			, m_bitmap(BAN::move(bitmap))
+		{
+			ASSERT(validate_size(m_width, m_height));
+			ASSERT(m_bitmap.size() >= m_width * m_height);
+		}
+
+	private:
+		const uint64_t m_width;
+		const uint64_t m_height;
+		const BAN::Vector<Color> m_bitmap;
+
+		friend class BAN::UniqPtr<Image>;
+	};
+
+}

LibImage/include/LibImage/Netbpm.h

@@ -0,0 +1,10 @@
+#include <BAN/ByteSpan.h>
+
+#include <LibImage/Image.h>
+
+namespace LibImage
+{
+
+	BAN::ErrorOr<BAN::UniqPtr<Image>> load_netbpm(BAN::ConstByteSpan);
+
+}

libc/stdlib.cpp

@@ -64,35 +64,14 @@ static constexpr int get_base_digit(char c, int base)
 	return -1;
 }
 
-template<BAN::integral T>
-static constexpr bool will_multiplication_overflow(T a, T b)
-{
-	if (a == 0 || b == 0)
-		return false;
-	if ((a > 0) == (b > 0))
-		return a > BAN::numeric_limits<T>::max() / b;
-	else
-		return a < BAN::numeric_limits<T>::min() / b;
-}
-
-template<BAN::integral T>
-static constexpr bool will_addition_overflow(T a, T b)
-{
-	if (a > 0 && b > 0)
-		return a > BAN::numeric_limits<T>::max() - b;
-	if (a < 0 && b < 0)
-		return a < BAN::numeric_limits<T>::min() - b;
-	return false;
-}
-
 template<BAN::integral T>
 static constexpr bool will_digit_append_overflow(bool negative, T current, int digit, int base)
 {
 	if (BAN::is_unsigned_v<T> && negative && digit)
 		return true;
-	if (will_multiplication_overflow<T>(current, base))
+	if (BAN::Math::will_multiplication_overflow<T>(current, base))
 		return true;
-	if (will_addition_overflow<T>(current * base, current < 0 ? -digit : digit))
+	if (BAN::Math::will_addition_overflow<T>(current * base, current < 0 ? -digit : digit))
 		return true;
 	return false;
 }
@@ -286,7 +265,7 @@ static T strtoT(const char* str, char** endp, int& error)
 		int extra_exponent = strtoT<int>(str + 1, &maybe_end, 10, exp_error);
 		if (exp_error != EINVAL)
 		{
-			if (exp_error == ERANGE || will_addition_overflow(exponent, extra_exponent))
+			if (exp_error == ERANGE || BAN::Math::will_addition_overflow(exponent, extra_exponent))
 				exponent = negative ? BAN::numeric_limits<int>::min() : BAN::numeric_limits<int>::max();
 			else
 				exponent += extra_exponent;

userspace/image/CMakeLists.txt

@@ -4,13 +4,11 @@ project(image CXX)
 
 set(SOURCES
 	main.cpp
-	Image.cpp
-	Netbpm.cpp
 )
 
 add_executable(image ${SOURCES})
 target_compile_options(image PUBLIC -O2 -g)
-target_link_libraries(image PUBLIC libc ban)
+target_link_libraries(image PUBLIC libc ban libimage)
 
 add_custom_target(image-install
 	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/image ${BANAN_BIN}/

userspace/image/Image.cpp

@@ -1,144 +0,0 @@
-#include "Image.h"
-#include "Netbpm.h"
-
-#include <fcntl.h>
-#include <stdlib.h>
-#include <sys/framebuffer.h>
-#include <sys/mman.h>
-
-BAN::UniqPtr<Image> Image::load_from_file(BAN::StringView path)
-{
-	int fd = -1;
-
-	if (path.data()[path.size()] == '\0')
-	{
-		fd = open(path.data(), O_RDONLY);
-	}
-	else
-	{
-		char* buffer = (char*)malloc(path.size() + 1);
-		if (!buffer)
-		{
-			perror("malloc");
-			return {};
-		}
-		memcpy(buffer, path.data(), path.size());
-		buffer[path.size()] = '\0';
-
-		fd = open(path.data(), O_RDONLY);
-
-		free(buffer);
-	}
-
-	if (fd == -1)
-	{
-		perror("open");
-		return {};
-	}
-
-	struct stat st;
-	if (fstat(fd, &st) == -1)
-	{
-		perror("fstat");
-		close(fd);
-		return {};
-	}
-
-	if (st.st_size < 2)
-	{
-		fprintf(stderr, "invalid image (too small)\n");
-		close(fd);
-		return {};
-	}
-
-	void* addr = mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-	if (addr == MAP_FAILED)
-	{
-		perror("mmap");
-		close(fd);
-		return {};
-	}
-
-	BAN::UniqPtr<Image> image;
-
-	uint16_t u16_signature = *reinterpret_cast<uint16_t*>(addr);
-	switch (u16_signature)
-	{
-		case 0x3650:
-		case 0x3550:
-		case 0x3450:
-		case 0x3350:
-		case 0x3250:
-		case 0x3150:
-			if (auto res = load_netbpm(addr, st.st_size); res.is_error())
-				fprintf(stderr, "%s\n", strerror(res.error().get_error_code()));
-			else
-				image = res.release_value();
-			break;
-		default:
-			fprintf(stderr, "unrecognized image format\n");
-			break;
-	}
-
-	munmap(addr, st.st_size);
-	close(fd);
-
-	return image;
-}
-
-bool Image::render_to_framebuffer()
-{
-	int fd = open("/dev/fb0", O_RDWR);
-	if (fd == -1)
-	{
-		perror("open");
-		return false;
-	}
-
-	framebuffer_info_t fb_info;
-	if (pread(fd, &fb_info, sizeof(fb_info), -1) == -1)
-	{
-		perror("pread");
-		close(fd);
-		return false;
-	}
-
-	ASSERT(BANAN_FB_BPP == 24 || BANAN_FB_BPP == 32);
-
-	size_t mmap_size = fb_info.height * fb_info.width * BANAN_FB_BPP / 8;
-
-	void* mmap_addr = mmap(nullptr, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-	if (mmap_addr == MAP_FAILED)
-	{
-		perror("mmap");
-		close(fd);
-		return false;
-	}
-
-	uint8_t* u8_fb = reinterpret_cast<uint8_t*>(mmap_addr);
-
-	for (uint64_t y = 0; y < BAN::Math::min<uint64_t>(height(), fb_info.height); y++)
-	{
-		for (uint64_t x = 0; x < BAN::Math::min<uint64_t>(width(), fb_info.width); x++)
-		{
-			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 0] = m_bitmap[y * width() + x].r;
-			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 1] = m_bitmap[y * width() + x].g;
-			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 2] = m_bitmap[y * width() + x].b;
-			if constexpr(BANAN_FB_BPP == 32)
-				u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 3] = m_bitmap[y * width() + x].a;
-		}
-	}
-
-	if (msync(mmap_addr, mmap_size, MS_SYNC) == -1)
-	{
-		perror("msync");
-		munmap(mmap_addr, mmap_size);
-		close(fd);
-		return false;
-	}
-
-	munmap(mmap_addr, mmap_size);
-	close(fd);
-
-	return true;
-}

userspace/image/Image.h

@@ -1,39 +0,0 @@
-#pragma once
-
-#include <BAN/StringView.h>
-#include <BAN/UniqPtr.h>
-#include <BAN/Vector.h>
-
-class Image
-{
-public:
-	struct Color
-	{
-		uint8_t r;
-		uint8_t g;
-		uint8_t b;
-		uint8_t a;
-	};
-
-public:
-	static BAN::UniqPtr<Image> load_from_file(BAN::StringView path);
-
-	uint64_t width() const { return m_width; }
-	uint64_t height() const { return m_height; }
-
-	bool render_to_framebuffer();
-
-private:
-	Image(uint64_t width, uint64_t height, BAN::Vector<Color>&& bitmap)
-		: m_width(width)
-		, m_height(height)
-		, m_bitmap(BAN::move(bitmap))
-	{ }
-
-private:
-	const uint64_t m_width;
-	const uint64_t m_height;
-	const BAN::Vector<Color> m_bitmap;
-
-	friend class BAN::UniqPtr<Image>;
-};

userspace/image/Netbpm.cpp

@@ -1,109 +0,0 @@
-#include "Netbpm.h"
-
-#include <BAN/Optional.h>
-
-#include <ctype.h>
-#include <inttypes.h>
-#include <stdio.h>
-
-BAN::Optional<uint64_t> parse_u64(const uint8_t*& data, size_t data_size)
-{
-	uint64_t result = 0;
-
-	// max supported size 10^20 - 1
-	for (size_t i = 0; i < 19; i++)
-	{
-		if (i >= data_size)
-		{
-			if (isdigit(*data))
-				return {};
-			return result;
-		}
-
-		if (!isdigit(*data))
-			return result;
-
-		result = (result * 10) + (*data - '0');
-		data++;
-	}
-
-	return {};
-}
-
-BAN::ErrorOr<BAN::UniqPtr<Image>> load_netbpm(const void* mmap_addr, size_t size)
-{
-	if (size < 11)
-	{
-		fprintf(stderr, "invalid Netbpm image (too small)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-
-	const uint8_t* u8_ptr = reinterpret_cast<const uint8_t*>(mmap_addr);
-
-	if (u8_ptr[0] != 'P')
-	{
-		fprintf(stderr, "not Netbpm image\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	if (u8_ptr[1] != '6')
-	{
-		fprintf(stderr, "unsupported Netbpm image\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	if (u8_ptr[2] != '\n')
-	{
-		fprintf(stderr, "invalid Netbpm image (invalid header)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	u8_ptr += 3;
-
-	auto width = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
-	if (!width.has_value() || *u8_ptr != ' ')
-	{
-		fprintf(stderr, "invalid Netbpm image (invalid width)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	u8_ptr++;
-
-	auto height = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
-	if (!height.has_value() || *u8_ptr != '\n')
-	{
-		fprintf(stderr, "invalid Netbpm image (invalid height)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	u8_ptr++;
-
-	auto header_end = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
-	if (!header_end.has_value() || *header_end != 255 || *u8_ptr != '\n')
-	{
-		fprintf(stderr, "invalid Netbpm image (invalid header end)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-	u8_ptr++;
-
-	if (size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)) < *width * *height * 3)
-	{
-		fprintf(stderr, "invalid Netbpm image (too small file size)\n");
-		return BAN::Error::from_errno(EINVAL);
-	}
-
-	printf("Netbpm image %" PRIu64 "x%" PRIu64 "\n", *width, *height);
-
-	BAN::Vector<Image::Color> bitmap;
-	TRY(bitmap.resize(*width * *height));
-
-	// Fill bitmap
-	for (uint64_t y = 0; y < *height; y++)
-	{
-		for (uint64_t x = 0; x < *width; x++)
-		{
-			auto& pixel = bitmap[y * *width + x];
-			pixel.r = *u8_ptr++;
-			pixel.g = *u8_ptr++;
-			pixel.b = *u8_ptr++;
-			pixel.a = 0xFF;
-		}
-	}
-
-	return TRY(BAN::UniqPtr<Image>::create(*width, *height, BAN::move(bitmap)));
-}

userspace/image/Netbpm.h

@@ -1,3 +0,0 @@
-#include "Image.h"
-
-BAN::ErrorOr<BAN::UniqPtr<Image>> load_netbpm(const void* mmap_addr, size_t size);

userspace/image/main.cpp

@@ -1,26 +1,95 @@
-#include "Image.h"
+#include <LibImage/Image.h>
 
+#include <fcntl.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <sys/framebuffer.h>
+#include <sys/mman.h>
 #include <unistd.h>
 
+void render_to_framebuffer(BAN::UniqPtr<LibImage::Image> image, bool scale)
+{
+	int fd = open("/dev/fb0", O_RDWR);
+	if (fd == -1)
+	{
+		perror("open");
+		exit(1);
+	}
+
+	framebuffer_info_t fb_info;
+	if (pread(fd, &fb_info, sizeof(fb_info), -1) == -1)
+	{
+		perror("pread");
+		exit(1);
+	}
+
+	if (scale)
+		image = MUST(image->resize(fb_info.width, fb_info.height));
+
+	ASSERT(BANAN_FB_BPP == 24 || BANAN_FB_BPP == 32);
+
+	size_t mmap_size = fb_info.height * fb_info.width * BANAN_FB_BPP / 8;
+
+	void* mmap_addr = mmap(nullptr, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (mmap_addr == MAP_FAILED)
+	{
+		perror("mmap");
+		exit(1);
+	}
+
+	uint8_t* u8_fb = reinterpret_cast<uint8_t*>(mmap_addr);
+
+	const auto& bitmap = image->bitmap();
+	for (uint64_t y = 0; y < BAN::Math::min<uint64_t>(image->height(), fb_info.height); y++)
+	{
+		for (uint64_t x = 0; x < BAN::Math::min<uint64_t>(image->width(), fb_info.width); x++)
+		{
+			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 0] = bitmap[y * image->width() + x].b;
+			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 1] = bitmap[y * image->width() + x].g;
+			u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 2] = bitmap[y * image->width() + x].r;
+			if constexpr(BANAN_FB_BPP == 32)
+				u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 3] = bitmap[y * image->width() + x].a;
+		}
+	}
+
+	if (msync(mmap_addr, mmap_size, MS_SYNC) == -1)
+	{
+		perror("msync");
+		exit(1);
+	}
+
+	munmap(mmap_addr, mmap_size);
+	close(fd);
+}
+
 int usage(char* arg0, int ret)
 {
 	FILE* out = (ret == 0) ? stdout : stderr;
-	fprintf(out, "usage: %s IMAGE_PATH\n", arg0);
+	fprintf(out, "usage: %s [options]... IMAGE_PATH\n", arg0);
+	fprintf(out, "options:\n");
+	fprintf(out, "    -h, --help:   show this message and exit\n");
+	fprintf(out, "    -s, --scale:  scale image to framebuffer size\n");
 	return ret;
 }
 
 int main(int argc, char** argv)
 {
-	if (argc != 2)
+	if (argc < 2)
 		return usage(argv[0], 1);
 
-	auto image = Image::load_from_file(argv[1]);
-	if (!image)
-		return 1;
+	bool scale = false;
+	for (int i = 1; i < argc - 1; i++)
+	{
+		if (strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "--scale") == 0)
+			scale = true;
+		else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0)
+			return usage(argv[0], 0);
+		else
+			return usage(argv[0], 1);
+	}
 
-	if (!image->render_to_framebuffer())
-		return 1;
+	auto image = MUST(LibImage::Image::load_from_file(argv[argc - 1]));
+	render_to_framebuffer(BAN::move(image), scale);
 
 	for (;;)
 		sleep(1);