RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 22:57:44 +00:00
Code Issues Activity Actions

Userland: static vs non-static constexpr variables

Browse source 
Problem:
- `static` variables consume memory and sometimes are less
  optimizable.
- `static const` variables can be `constexpr`, usually.
- `static` function-local variables require an initialization check
  every time the function is run.

Solution:
- If a global `static` variable is only used in a single function then
  move it into the function and make it non-`static` and `constexpr`.
- Make all global `static` variables `constexpr` instead of `const`.
- Change function-local `static const[expr]` variables to be just
  `constexpr`.
This commit is contained in:
Lenny Maiorani 2021-05-19 09:32:07 -06:00 • committed by Linus Groh
parent 17ff895e1c
commit 800ea8ea96
38 changed files with 192 additions and 184 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Userland/Libraries/LibGfx/GIFLoader.cpp
View file

@ -19,10 +19,6 @@
namespace Gfx {
// Row strides and offsets for each interlace pass.
static const int INTERLACE_ROW_STRIDES[] = { 8, 8, 4, 2 };
static const int INTERLACE_ROW_OFFSETS[] = { 0, 4, 2, 1 };
struct ImageDescriptor {
u16 x { 0 };
u16 y { 0 };
@ -112,8 +108,8 @@ enum class GIFFormat {
static Optional<GIFFormat> decode_gif_header(InputMemoryStream& stream)
{
static const char valid_header_87[] = "GIF87a";
static const char valid_header_89[] = "GIF89a";
constexpr char valid_header_87[] = "GIF87a";
constexpr char valid_header_89[] = "GIF89a";
Array<u8, 6> header;
stream >> header;
@ -378,6 +374,8 @@ static bool decode_frame(GIFLoadingContext& context, size_t frame_index)
if (pixel_index % image.width == 0) {
if (image.interlaced) {
if (interlace_pass < 4) {
constexpr Array INTERLACE_ROW_STRIDES = { 8, 8, 4, 2 };
constexpr Array INTERLACE_ROW_OFFSETS = { 0, 4, 2, 1 };
if (row + INTERLACE_ROW_STRIDES[interlace_pass] >= image.height) {
++interlace_pass;
if (interlace_pass < 4)