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收口颜色格式，删除原来的 RGBA8888 的存储和调用

This commit is contained in:
SepComet 2026-06-09 09:00:43 +08:00
parent 23a5b50aec
commit 56eec9e9d2
8 changed files with 142 additions and 158 deletions
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111
src/Apps/Game/tools/asset_pipeline/SpriteAssetTool.cpp
View File

@ -2,6 +2,7 @@
#include <SDL_image.h>
#include <algorithm>
#include <cstdint>
#include <cstring>
#include <fstream>
#include <iomanip>
#include <iostream>
@ -49,7 +50,7 @@ namespace
struct Image
{
std::vector<uint32_t> pixels;
std::vector<uint16_t> pixels;
int32_t width;
int32_t height;
@ -65,6 +66,52 @@ namespace
}
};
static uint16_t PackRgba5551(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
return static_cast<uint16_t>(
((static_cast<uint16_t>(r) >> 3) << 11) |
((static_cast<uint16_t>(g) >> 3) << 6) |
((static_cast<uint16_t>(b) >> 3) << 1) |
(a ? 1u : 0u));
}
static Uint32 ReadSurfacePixel(const SDL_Surface* surface, int32_t x, int32_t y)
{
const uint8_t* row = static_cast<const uint8_t*>(surface->pixels) +
static_cast<size_t>(y) * static_cast<size_t>(surface->pitch);
const uint8_t* src = row + static_cast<size_t>(x) * static_cast<size_t>(surface->format->BytesPerPixel);
switch (surface->format->BytesPerPixel)
{
case 1:
return src[0];
case 2:
{
uint16_t pixel = 0;
std::memcpy(&pixel, src, sizeof(pixel));
return static_cast<Uint32>(pixel);
}
case 3:
if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
return (static_cast<Uint32>(src[0]) << 16) |
(static_cast<Uint32>(src[1]) << 8) |
static_cast<Uint32>(src[2]);
}
return static_cast<Uint32>(src[0]) |
(static_cast<Uint32>(src[1]) << 8) |
(static_cast<Uint32>(src[2]) << 16);
case 4:
{
Uint32 pixel = 0;
std::memcpy(&pixel, src, sizeof(pixel));
return pixel;
}
default:
return 0;
}
}
struct AtlasRegion
{
const SourceSpec* source;
@ -105,39 +152,34 @@ namespace
return false;
}
SDL_Surface* rgba_surface = SDL_ConvertSurfaceFormat(loaded_surface, SDL_PIXELFORMAT_RGBA8888, 0);
SDL_FreeSurface(loaded_surface);
if (rgba_surface == nullptr)
{
std::cerr << "SDL_ConvertSurfaceFormat failed: " << SDL_GetError() << std::endl;
return false;
}
if (SDL_LockSurface(rgba_surface) != 0)
if (SDL_LockSurface(loaded_surface) != 0)
{
std::cerr << "SDL_LockSurface failed: " << SDL_GetError() << std::endl;
SDL_FreeSurface(rgba_surface);
SDL_FreeSurface(loaded_surface);
return false;
}
image.width = rgba_surface->w;
image.height = rgba_surface->h;
image.width = loaded_surface->w;
image.height = loaded_surface->h;
image.pixels.assign(static_cast<size_t>(image.width) * static_cast<size_t>(image.height), 0);
for (int32_t y = 0; y < image.height; ++y)
{
const uint8_t* src_row = static_cast<const uint8_t*>(rgba_surface->pixels) + y * rgba_surface->pitch;
const uint32_t* src_pixels = reinterpret_cast<const uint32_t*>(src_row);
for (int32_t x = 0; x < image.width; ++x)
{
const uint32_t pixel = src_pixels[x];
uint8_t r = 0;
uint8_t g = 0;
uint8_t b = 0;
uint8_t a = 0;
const Uint32 surface_pixel = ReadSurfacePixel(loaded_surface, x, y);
SDL_GetRGBA(surface_pixel, loaded_surface->format, &r, &g, &b, &a);
image.pixels[static_cast<size_t>(y) * static_cast<size_t>(image.width) + static_cast<size_t>(x)] =
(pixel & 0xFFu) == 0u ? 0x00000000u : pixel;
a == 0 ? 0u : PackRgba5551(r, g, b, a);
}
}
SDL_UnlockSurface(rgba_surface);
SDL_FreeSurface(rgba_surface);
SDL_UnlockSurface(loaded_surface);
SDL_FreeSurface(loaded_surface);
return image.is_valid();
}
@ -245,11 +287,11 @@ namespace
return atlas_height > 0;
}
static std::vector<uint32_t> BuildAtlasPixels(const std::vector<AtlasRegion>& regions, int32_t atlas_height)
static std::vector<uint16_t> BuildAtlasPixels(const std::vector<AtlasRegion>& regions, int32_t atlas_height)
{
std::vector<uint32_t> atlas_pixels(
std::vector<uint16_t> atlas_pixels(
static_cast<size_t>(AtlasWidth) * static_cast<size_t>(atlas_height),
0x00000000u);
0u);
for (size_t i = 0; i < regions.size(); ++i)
{
@ -262,28 +304,15 @@ namespace
static_cast<size_t>(region.x);
std::copy(
region.image.pixels.begin() + static_cast<std::vector<uint32_t>::difference_type>(src_offset),
region.image.pixels.begin() + static_cast<std::vector<uint32_t>::difference_type>(src_offset + static_cast<size_t>(region.image.width)),
atlas_pixels.begin() + static_cast<std::vector<uint32_t>::difference_type>(dst_offset));
region.image.pixels.begin() + static_cast<std::vector<uint16_t>::difference_type>(src_offset),
region.image.pixels.begin() + static_cast<std::vector<uint16_t>::difference_type>(src_offset + static_cast<size_t>(region.image.width)),
atlas_pixels.begin() + static_cast<std::vector<uint16_t>::difference_type>(dst_offset));
}
}
return atlas_pixels;
}
static uint16_t rgba8888_to_rgba5551(uint32_t c)
{
uint32_t r = (c >> 24) & 0xFFu;
uint32_t g = (c >> 16) & 0xFFu;
uint32_t b = (c >> 8) & 0xFFu;
uint32_t a = c & 0xFFu;
return static_cast<uint16_t>(
((r >> 3) << 11) |
((g >> 3) << 6) |
((b >> 3) << 1) |
(a ? 1u : 0u));
}
static void WritePixel5551(std::ofstream& file, uint16_t pixel)
{
file << "0x"
@ -299,7 +328,7 @@ namespace
static bool WriteAtlasHeader(
const std::vector<AtlasRegion>& regions,
const std::vector<uint32_t>& atlas_pixels,
const std::vector<uint16_t>& atlas_pixels,
int32_t atlas_height)
{
std::ofstream file(OutputHeaderPath);
@ -326,7 +355,7 @@ namespace
const size_t end = std::min(i + 12, atlas_pixels.size());
for (size_t j = i; j < end; ++j)
{
WritePixel5551(file, rgba8888_to_rgba5551(atlas_pixels[j]));
WritePixel5551(file, atlas_pixels[j]);
file << ", ";
}
file << "\n";
@ -375,7 +404,7 @@ namespace
return false;
}
const std::vector<uint32_t> atlas_pixels = BuildAtlasPixels(regions, atlas_height);
const std::vector<uint16_t> atlas_pixels = BuildAtlasPixels(regions, atlas_height);
if (!WriteAtlasHeader(regions, atlas_pixels, atlas_height))
{
return false;

21
src/Core/Asset/SpriteAssetLoader.cpp
View File

@ -163,6 +163,10 @@ namespace Asset
{
return false;
}
if (image.format != RenderData::PixelFormat::RGBA5551)
{
return false;
}
size_t pixelCount = 0;
if (!CheckPixelCount(static_cast<uint32_t>(image.width), static_cast<uint32_t>(image.height), pixelCount))
@ -182,21 +186,10 @@ namespace Asset
WriteU32LE(file, static_cast<uint32_t>(image.height));
WriteU32LE(file, SpriteFormatRgba5551);
if (image.format == RenderData::PixelFormat::RGBA5551)
const uint16_t* pixels16 = static_cast<const uint16_t*>(image.pixels);
for (size_t i = 0; i < pixelCount; ++i)
{
const uint16_t* pixels16 = static_cast<const uint16_t*>(image.pixels);
for (size_t i = 0; i < pixelCount; ++i)
{
WritePixel5551(file, pixels16[i]);
}
}
else
{
const uint32_t* pixels32 = static_cast<const uint32_t*>(image.pixels);
for (size_t i = 0; i < pixelCount; ++i)
{
WritePixel5551(file, RenderData::rgba8888_to_rgba5551(pixels32[i]));
}
WritePixel5551(file, pixels16[i]);
}
return file.good();

66
src/Core/Draw2D/DrawContext.cpp
View File

@ -124,53 +124,9 @@ namespace Core
if (dst_x + end_dx > screen_w) end_dx = screen_w - dst_x;
if (dst_y + end_dy > screen_h) end_dy = screen_h - dst_y;
if (img.format == RenderData::PixelFormat::RGBA5551)
{
Core::FramePixel* dst = static_cast<Core::FramePixel*>(frameBuffer->get_buffer());
const int32_t fb_w = frameBuffer->get_width();
const uint16_t* src = static_cast<const uint16_t*>(img.pixels);
if (scale == 1)
{
for (int32_t sy = start_dy; sy < end_dy; ++sy)
{
const int32_t read_y = flip_v ? (src_y + src_h - 1 - sy) : (src_y + sy);
const int32_t dst_y_abs = dst_y + sy;
Core::FramePixel* dst_row = dst + dst_y_abs * fb_w;
for (int32_t sx = start_dx; sx < end_dx; ++sx)
{
const int32_t read_x = flip_h ? (src_x + src_w - 1 - sx) : (src_x + sx);
const uint16_t pixel = src[read_y * img_w + read_x];
if (!RenderData::rgba5551_is_opaque(pixel)) continue;
dst_row[dst_x + sx] = RenderData::rgba5551_to_rgb565(pixel);
}
}
return;
}
for (int32_t dy_abs = start_dy; dy_abs < end_dy; ++dy_abs)
{
const int32_t sy = dy_abs / scale;
const int32_t read_y = flip_v ? (src_y + src_h - 1 - sy) : (src_y + sy);
const int32_t dst_y_abs = dst_y + dy_abs;
Core::FramePixel* dst_row = dst + dst_y_abs * fb_w;
for (int32_t dx_abs = start_dx; dx_abs < end_dx; ++dx_abs)
{
const int32_t sx = dx_abs / scale;
const int32_t read_x = flip_h ? (src_x + src_w - 1 - sx) : (src_x + sx);
const uint16_t pixel = src[read_y * img_w + read_x];
if (!RenderData::rgba5551_is_opaque(pixel)) continue;
dst_row[dst_x + dx_abs] = RenderData::rgba5551_to_rgb565(pixel);
}
}
return;
}
const bool has_key = img.has_color_key;
const uint32_t key = RenderData::rgba5551_to_rgba8888(img.color_key);
const uint32_t* src32 = static_cast<const uint32_t*>(img.pixels);
Core::FramePixel* dst = static_cast<Core::FramePixel*>(frameBuffer->get_buffer());
const int32_t fb_w = frameBuffer->get_width();
const uint16_t* src = static_cast<const uint16_t*>(img.pixels);
if (scale == 1)
{
@ -178,14 +134,14 @@ namespace Core
{
const int32_t read_y = flip_v ? (src_y + src_h - 1 - sy) : (src_y + sy);
const int32_t dst_y_abs = dst_y + sy;
Core::FramePixel* dst_row = dst + dst_y_abs * fb_w;
for (int32_t sx = start_dx; sx < end_dx; ++sx)
{
const int32_t read_x = flip_h ? (src_x + src_w - 1 - sx) : (src_x + sx);
const uint32_t pixel = src32[read_y * img_w + read_x];
if ((pixel & 0xFFu) == 0u) continue;
if (has_key && pixel == key) continue;
frameBuffer->set_pixel_unsafe(dst_x + sx, dst_y_abs, pixel);
const uint16_t pixel = src[read_y * img_w + read_x];
if (!RenderData::rgba5551_is_opaque(pixel)) continue;
dst_row[dst_x + sx] = RenderData::rgba5551_to_rgb565(pixel);
}
}
return;
@ -196,15 +152,15 @@ namespace Core
const int32_t sy = dy_abs / scale;
const int32_t read_y = flip_v ? (src_y + src_h - 1 - sy) : (src_y + sy);
const int32_t dst_y_abs = dst_y + dy_abs;
Core::FramePixel* dst_row = dst + dst_y_abs * fb_w;
for (int32_t dx_abs = start_dx; dx_abs < end_dx; ++dx_abs)
{
const int32_t sx = dx_abs / scale;
const int32_t read_x = flip_h ? (src_x + src_w - 1 - sx) : (src_x + sx);
const uint32_t pixel = src32[read_y * img_w + read_x];
if ((pixel & 0xFFu) == 0u) continue;
if (has_key && pixel == key) continue;
frameBuffer->set_pixel_unsafe(dst_x + dx_abs, dst_y_abs, pixel);
const uint16_t pixel = src[read_y * img_w + read_x];
if (!RenderData::rgba5551_is_opaque(pixel)) continue;
dst_row[dst_x + dx_abs] = RenderData::rgba5551_to_rgb565(pixel);
}
}
}

40
src/Core/RenderData/Image.h
View File

@ -6,7 +6,6 @@ namespace RenderData
{
enum class PixelFormat
{
RGBA8888,
RGBA5551
};
@ -24,31 +23,6 @@ namespace RenderData
return (c & 0x1u) != 0;
}
inline uint32_t rgba5551_to_rgba8888(uint16_t c)
{
uint32_t r = (c >> 11) & 0x1Fu;
uint32_t g = (c >> 6) & 0x1Fu;
uint32_t b = (c >> 1) & 0x1Fu;
uint32_t a = c & 0x1u;
return (r << 27) | (r << 24) |
(g << 19) | (g << 16) |
(b << 11) | (b << 8) |
(a ? 0xFFu : 0x00u);
}
inline uint16_t rgba8888_to_rgba5551(uint32_t c)
{
uint32_t r = (c >> 24) & 0xFFu;
uint32_t g = (c >> 16) & 0xFFu;
uint32_t b = (c >> 8) & 0xFFu;
uint32_t a = c & 0xFFu;
return static_cast<uint16_t>(
((r >> 3) << 11) |
((g >> 3) << 6) |
((b >> 3) << 1) |
(a ? 1u : 0u));
}
struct Image
{
const void* pixels;
@ -61,29 +35,25 @@ namespace RenderData
Image()
: pixels(nullptr), width(0), height(0),
color_key(0), has_color_key(false),
format(PixelFormat::RGBA8888) {}
format(PixelFormat::RGBA5551) {}
Image(const void* pixels, int32_t width, int32_t height,
PixelFormat fmt = PixelFormat::RGBA8888)
PixelFormat fmt = PixelFormat::RGBA5551)
: pixels(pixels), width(width), height(height),
color_key(0), has_color_key(false),
format(fmt) {}
Image(const void* pixels, int32_t width, int32_t height,
uint16_t color_key,
PixelFormat fmt = PixelFormat::RGBA8888)
PixelFormat fmt = PixelFormat::RGBA5551)
: pixels(pixels), width(width), height(height),
color_key(color_key), has_color_key(true),
format(fmt) {}
uint32_t get_pixel(int32_t x, int32_t y) const
{
if (format == PixelFormat::RGBA5551)
{
return rgba5551_to_rgba8888(
static_cast<const uint16_t*>(pixels)[y * width + x]);
}
return static_cast<const uint32_t*>(pixels)[y * width + x];
return static_cast<uint32_t>(
static_cast<const uint16_t*>(pixels)[y * width + x]);
}
};
}

28
src/Rasterizer/SpriteRasterizer.cpp
View File

@ -5,6 +5,23 @@
namespace Rasterizer
{
namespace
{
inline uint16_t rgba5551_to_rgb565(uint16_t c)
{
const uint16_t r = static_cast<uint16_t>((c >> 11) & 0x1Fu);
const uint16_t g = static_cast<uint16_t>((c >> 6) & 0x1Fu);
const uint16_t b = static_cast<uint16_t>((c >> 1) & 0x1Fu);
const uint16_t g6 = static_cast<uint16_t>((g << 1) | (g >> 4));
return static_cast<uint16_t>((r << 11) | (g6 << 5) | b);
}
inline bool rgba5551_is_opaque(uint16_t c)
{
return (c & 0x1u) != 0;
}
}
void SpriteRasterizer::DrawImage(const RenderData::Image& image, int32_t x, int32_t y)
{
DrawSprite(RenderData::Sprite(&image), x, y);
@ -27,18 +44,21 @@ namespace Rasterizer
return;
}
Core::FramePixel* dst = static_cast<Core::FramePixel*>(frameBuffer->get_buffer());
const int32_t fb_w = frameBuffer->get_width();
for (int32_t sy = minY; sy < maxY; ++sy)
{
Core::FramePixel* dst_row = dst + (y + sy) * fb_w;
for (int32_t sx = minX; sx < maxX; ++sx)
{
const uint32_t color = sprite.get_pixel_fast(sx, sy);
const uint8_t alpha = static_cast<uint8_t>(color & 0xFF);
if (alpha == 0)
const uint16_t color = sprite.get_pixel_fast(sx, sy);
if (!rgba5551_is_opaque(color))
{
continue;
}
frameBuffer->set_pixel(x + sx, y + sy, color);
dst_row[x + sx] = rgba5551_to_rgb565(color);
}
}
}

14
src/RenderData/Image.h
View File

@ -11,7 +11,7 @@ namespace RenderData
private:
int32_t width;
int32_t height;
std::vector<uint32_t> pixels;
std::vector<uint16_t> pixels;
static bool calculate_pixel_count(int32_t width, int32_t height, size_t& count)
{
@ -47,7 +47,7 @@ namespace RenderData
}
}
Image(int32_t width, int32_t height, const std::vector<uint32_t>& pixels) : width(0), height(0)
Image(int32_t width, int32_t height, const std::vector<uint16_t>& pixels) : width(0), height(0)
{
size_t pixelCount = 0;
if (calculate_pixel_count(width, height, pixelCount) && pixels.size() == pixelCount)
@ -64,9 +64,9 @@ namespace RenderData
size_t total_pixels() const { return pixels.size(); }
const uint32_t* data() const { return pixels.data(); }
const uint16_t* data() const { return pixels.data(); }
uint32_t* data() { return pixels.data(); }
uint16_t* data() { return pixels.data(); }
bool is_valid() const
{
@ -74,7 +74,7 @@ namespace RenderData
return calculate_pixel_count(width, height, pixelCount) && pixels.size() == pixelCount;
}
uint32_t get_pixel(int32_t x, int32_t y) const
uint16_t get_pixel(int32_t x, int32_t y) const
{
if (x < 0 || x >= width || y < 0 || y >= height)
{
@ -85,13 +85,13 @@ namespace RenderData
return pixels[index];
}
uint32_t get_pixel_fast(int32_t x, int32_t y) const
uint16_t get_pixel_fast(int32_t x, int32_t y) const
{
size_t index = static_cast<size_t>(y) * width + x;
return pixels[index];
}
void set_pixel(int32_t x, int32_t y, uint32_t color)
void set_pixel(int32_t x, int32_t y, uint16_t color)
{
if (x < 0 || x >= width || y < 0 || y >= height)
{

4
src/RenderData/Sprite.h
View File

@ -45,7 +45,7 @@ namespace RenderData
return x + width <= image->get_width() && y + height <= image->get_height();
}
uint32_t get_pixel(int32_t localX, int32_t localY) const
uint16_t get_pixel(int32_t localX, int32_t localY) const
{
if (!is_valid() || localX < 0 || localX >= width || localY < 0 || localY >= height)
{
@ -55,7 +55,7 @@ namespace RenderData
return image->get_pixel(x + localX, y + localY);
}
uint32_t get_pixel_fast(int32_t localX, int32_t localY) const
uint16_t get_pixel_fast(int32_t localX, int32_t localY) const
{
return image->get_pixel_fast(x + localX, y + localY);
}

16
tests/render_pipeline_tests.cpp
View File

@ -53,6 +53,21 @@ namespace
assert(pixels[1] == 0xF800u);
}
void TestImageDefaultsToRgba5551AndReturnsRawPixels()
{
const uint16_t default_pixels[] = { 0xF801u, 0x0000u };
RenderData::Image default_image(default_pixels, 1, 1);
assert(default_image.format == RenderData::PixelFormat::RGBA5551);
const uint16_t explicit_pixels[] = { 0x07C1u };
RenderData::Image explicit_image(
explicit_pixels,
1,
1,
RenderData::PixelFormat::RGBA5551);
assert(explicit_image.get_pixel(0, 0) == 0x07C1u);
}
void TestDrawSpriteUsesOneBitAlpha()
{
const uint16_t sprite_pixels[] = {
@ -199,6 +214,7 @@ int main()
{
TestFramePixelIsRgb565();
TestFrameBufferStoresRgb565();
TestImageDefaultsToRgba5551AndReturnsRawPixels();
TestDrawSpriteUsesOneBitAlpha();
TestSpriteAssetLoaderRoundTripsRgba5551();
TestDrawTextUsesBitMaskAndColor();