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LibGfx/JBIG2: Make context index a u8

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This value is at most 46, so a u8 is enough.

We have tens of thousands of these contexts.

(We could pack the is_mps bit into that u8 as well, but
then the I() and MPS() functions need to return helper objects
instead of a direct reference, so let's not do that part for now.)
This commit is contained in:
Nico Weber 2024-03-15 18:44:46 -04:00 committed by Andreas Kling
parent 7cb12e057f
commit 924423c596
Notes: sideshowbarker 2024-07-17 06:51:48 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/924423c596
Pull-request: https://github.com/SerenityOS/serenity/pull/23644
Reviewed-by: https://github.com/trflynn89 ✅
1 changed files with 2 additions and 2 deletions
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4
Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.h
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@ -22,7 +22,7 @@ namespace JBIG2 {
class ArithmeticDecoder {
public:
struct Context {
u16 I; // Index I stored for context CX (E.2.4)
u8 I; // Index I stored for context CX (E.2.4)
u8 is_mps; // "More probable symbol" (E.1.1). 0 or 1.
};
@ -64,7 +64,7 @@ private:
u8 CT; // Count of the number of bits in C.
Context* CX;
static u16& I(Context* cx) { return cx->I; }
static u8& I(Context* cx) { return cx->I; }
static u8& MPS(Context* cx) { return cx->is_mps; }
static u16 Qe(u16);
static u8 NMPS(u16);