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LibGfx: Remove some magic variables in JPEGLoader

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This commit is contained in:
Lucas CHOLLET 2023-02-19 11:26:49 -05:00 • committed by Andreas Kling
parent c8213c24dd
commit 71afef6466
1 changed files with 17 additions and 12 deletions
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29
Userland/Libraries/LibGfx/JPEGLoader.cpp
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@ -61,12 +61,14 @@
#define JPEG_DHP 0xFFDE
#define JPEG_EXP 0xFFDF
#define JPEG_DAC 0XFFCC
#define JPEG_DHT 0XFFC4
#define JPEG_DQT 0XFFDB
#define JPEG_EOI 0xFFD9
#define JPEG_RST 0XFFDD
#define JPEG_SOF0 0XFFC0
#define JPEG_SOF2 0xFFC2
#define JPEG_SOF15 0xFFCF
#define JPEG_SOI 0XFFD8
#define JPEG_SOS 0XFFDA
#define JPEG_COM 0xFFFE
@ -425,6 +427,17 @@ static inline ErrorOr<void> ensure_bounds_okay(const size_t cursor, const size_t
return {};
}
static bool is_frame_marker(Marker const marker)
{
// B.1.1.3 - Marker assignments
bool const is_sof_marker = marker >= JPEG_SOF0 && marker <= JPEG_SOF15;
// Start of frame markers are valid for JPEG_SOF0 to JPEG_SOF15 except number 4, 8 (reserved) and 12.
bool const is_defined_marker = marker != JPEG_DHT && marker != 0xFFC8 && marker != JPEG_DAC;
return is_sof_marker && is_defined_marker;
}
static inline bool is_supported_marker(Marker const marker)
{
if (marker >= JPEG_APPN0 && marker <= JPEG_APPNF) {
@ -450,12 +463,8 @@ static inline bool is_supported_marker(Marker const marker)
return true;
}
if (marker >= 0xFFC0 && marker <= 0xFFCF) {
if (marker != 0xFFC4 && marker != 0xFFC8 && marker != 0xFFCC) {
dbgln_if(JPEG_DEBUG, "Decoding this frame-type (SOF{}) is not currently supported. Decoder will fail!", marker & 0xf);
return false;
}
}
if (is_frame_marker(marker))
dbgln_if(JPEG_DEBUG, "Decoding this frame-type (SOF{}) is not currently supported. Decoder will fail!", marker & 0xf);
return false;
}
@ -1098,12 +1107,8 @@ static ErrorOr<void> parse_header(AK::SeekableStream& stream, JPEGLoadingContext
marker = TRY(read_marker_at_cursor(stream));
// Set frame type if the marker marks a new frame.
if (marker >= 0xFFC0 && marker <= 0xFFCF) {
// Ignore interleaved markers.
if (marker != 0xFFC4 && marker != 0xFFC8 && marker != 0xFFCC) {
context.frame.type = static_cast<StartOfFrame::FrameType>(marker & 0xF);
}
}
if (is_frame_marker(marker))
context.frame.type = static_cast<StartOfFrame::FrameType>(marker & 0xF);
switch (marker) {
case JPEG_INVALID: