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LibGfx: GIFLoader: Propagate errors properly

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Use our normal error propagation mechanism instead of returning booleans
This commit is contained in:
ericLemanissier 2022-12-22 08:00:39 +01:00 • committed by Tim Flynn
parent d0ddbf4aad
commit 030d380ed2
1 changed files with 22 additions and 23 deletions
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45
Userland/Libraries/LibGfx/GIFLoader.cpp
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@ -7,10 +7,12 @@
#include <AK/Array.h>
#include <AK/Debug.h>
#include <AK/Error.h>
#include <AK/IntegralMath.h>
#include <AK/Memory.h>
#include <AK/MemoryStream.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/Try.h>
#include <LibGfx/GIFLoader.h>
#include <string.h>
@ -261,31 +263,22 @@ static void clear_rect(Bitmap& bitmap, IntRect const& rect, Color color)
}
}
static bool decode_frame(GIFLoadingContext& context, size_t frame_index)
static ErrorOr<void> decode_frame(GIFLoadingContext& context, size_t frame_index)
{
if (frame_index >= context.images.size()) {
return false;
return Error::from_string_literal("frame_index size too high");
}
if (context.state >= GIFLoadingContext::State::FrameComplete && frame_index == context.current_frame) {
return true;
return {};
}
size_t start_frame = context.current_frame + 1;
if (context.state < GIFLoadingContext::State::FrameComplete) {
start_frame = 0;
{
auto bitmap_or_error = Bitmap::try_create(BitmapFormat::BGRA8888, { context.logical_screen.width, context.logical_screen.height });
if (bitmap_or_error.is_error())
return false;
context.frame_buffer = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
}
{
auto bitmap_or_error = Bitmap::try_create(BitmapFormat::BGRA8888, { context.logical_screen.width, context.logical_screen.height });
if (bitmap_or_error.is_error())
return false;
context.prev_frame_buffer = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
}
context.frame_buffer = TRY(Bitmap::try_create(BitmapFormat::BGRA8888, { context.logical_screen.width, context.logical_screen.height }));
context.prev_frame_buffer = TRY(Bitmap::try_create(BitmapFormat::BGRA8888, { context.logical_screen.width, context.logical_screen.height }));
} else if (frame_index < context.current_frame) {
start_frame = 0;
}
@ -319,7 +312,7 @@ static bool decode_frame(GIFLoadingContext& context, size_t frame_index)
}
if (image.lzw_min_code_size > 8)
return false;
return Error::from_string_literal("LZW minimum code size is greater than 8");
LZWDecoder decoder(image.lzw_encoded_bytes, image.lzw_min_code_size);
@ -336,7 +329,7 @@ static bool decode_frame(GIFLoadingContext& context, size_t frame_index)
Optional<u16> code = decoder.next_code();
if (!code.has_value()) {
dbgln_if(GIF_DEBUG, "Unexpectedly reached end of gif frame data");
return false;
return Error::from_string_literal("Unexpectedly reached end of gif frame data");
}
if (code.value() == clear_code) {
@ -382,7 +375,7 @@ static bool decode_frame(GIFLoadingContext& context, size_t frame_index)
context.state = GIFLoadingContext::State::FrameComplete;
}
return true;
return {};
}
static bool load_gif_frame_descriptors(GIFLoadingContext& context)
@ -705,12 +698,18 @@ ErrorOr<ImageFrameDescriptor> GIFImageDecoderPlugin::frame(size_t index)
}
}
if (m_context->error_state == GIFLoadingContext::ErrorState::NoError && !decode_frame(*m_context, index)) {
if (m_context->state < GIFLoadingContext::State::FrameComplete || !decode_frame(*m_context, 0)) {
m_context->error_state = GIFLoadingContext::ErrorState::FailedToDecodeAnyFrame;
return Error::from_string_literal("GIFImageDecoderPlugin: Decoding failed");
if (m_context->error_state == GIFLoadingContext::ErrorState::NoError) {
if (auto result = decode_frame(*m_context, index); result.is_error()) {
if (m_context->state < GIFLoadingContext::State::FrameComplete) {
m_context->error_state = GIFLoadingContext::ErrorState::FailedToDecodeAnyFrame;
return result.release_error();
}
if (auto result = decode_frame(*m_context, 0); result.is_error()) {
m_context->error_state = GIFLoadingContext::ErrorState::FailedToDecodeAnyFrame;
return result.release_error();
}
m_context->error_state = GIFLoadingContext::ErrorState::FailedToDecodeAllFrames;
}
m_context->error_state = GIFLoadingContext::ErrorState::FailedToDecodeAllFrames;
}
ImageFrameDescriptor frame {};