From d43508ba4843801cbbf1f42a27af260d4eef5701 Mon Sep 17 00:00:00 2001
From: hnOsmium0001 <hn.osmium0001@gmail.com>
Date: Sun, 17 Apr 2022 20:08:57 -0700
Subject: Initial work on sprites and texture system

---
 source/Image.cpp | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 source/Image.cpp

(limited to 'source/Image.cpp')

diff --git a/source/Image.cpp b/source/Image.cpp
new file mode 100644
index 0000000..3673acc
--- /dev/null
+++ b/source/Image.cpp
@@ -0,0 +1,101 @@
+#include "Image.hpp"
+
+#include <stb_image.h>
+#include <stb_rect_pack.h>
+#include <cstring>
+
+Image::Image()
+	: mSize{}
+	, mChannels{ 0 } {
+}
+
+bool Image::InitFromImageFile(const char* filePath, int desiredChannels) {
+	// Dimensions of the image in
+	int width, height;
+	// Number of channels that the image has, we'll get `desiredChannels` channels in our output (if it's non-0, which is the default argument)
+	int channels;
+
+	// NOTE: don't free, the data is passed to std::unique_ptr
+	auto result = (uint8_t*)stbi_load(filePath, &width, &height, &channels, desiredChannels);
+	if (!result) {
+		return false;
+	}
+
+	mData.reset(result);
+	mSize = { width, height };
+	mChannels = desiredChannels == 0 ? channels : desiredChannels;
+	return true;
+}
+
+bool Image::InitFromImageData(std::span<uint8_t> data, int desiredChannels) {
+	int width, height;
+	int channels;
+
+	// NOTE: don't free, the data is passed to std::unique_ptr
+	auto result = (uint8_t*)stbi_load_from_memory(data.data(), data.size(), &width, &height, &channels, desiredChannels);
+	if (!result) {
+		return false;
+	}
+
+	mData.reset(result);
+	mSize = { width, height };
+	mChannels = desiredChannels == 0 ? channels : desiredChannels;
+	return true;
+}
+
+bool Image::InitFromPixels(std::span<uint8_t> pixels, glm::ivec2 dimensions, int channels) {
+	mData = std::make_unique<uint8_t[]>(pixels.size());
+	std::memcpy(mData.get(), pixels.data(), pixels.size());
+	mSize = dimensions;
+	mChannels = channels;
+	return true;
+}
+
+bool Image::InitFromPixels(std::unique_ptr<uint8_t[]> pixels, glm::ivec2 dimensions, int channels) {
+	mData = std::move(pixels);
+	mSize = dimensions;
+	mChannels = channels;
+	return true;
+}
+
+RgbaColor Image::GetPixel(int x, int y) const {
+	size_t offset = (y * mSize.x + x) * mChannels;
+	RgbaColor color;
+	color.r = mData.get()[offset + 0];
+	color.g = mData.get()[offset + 1];
+	color.b = mData.get()[offset + 2];
+	color.a = mData.get()[offset + 3];
+	return color;
+}
+
+void Image::SetPixel(int x, int y, RgbaColor color) {
+	size_t offset = (y * mSize.x + x) * mChannels;
+	mData.get()[offset + 0] = color.r;
+	mData.get()[offset + 1] = color.g;
+	mData.get()[offset + 2] = color.b;
+	mData.get()[offset + 3] = color.a;
+}
+
+uint8_t* Image::GetDataPtr() const {
+	return mData.get();
+}
+
+size_t Image::GetDataLength() const {
+	return mSize.x * mSize.y * mChannels * sizeof(uint8_t);
+}
+
+std::span<uint8_t> Image::GetData() const {
+	return { mData.get(), GetDataLength() };
+}
+
+glm::ivec2 Image::GetSize() const {
+	return mSize;
+}
+
+int Image::GetChannels() const {
+	return mChannels;
+}
+
+bool Image::IsEmpty() const {
+	return mSize.x == 0 || mSize.y == 0;
+}
-- 
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