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PNGLoader: Allocate enough space for the compressed data buffer up front.

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This is a 2x speedup on wallpaper loading.
This commit is contained in:
Andreas Kling 2019-03-21 14:08:14 +01:00
parent 332b5a96f6
commit fe25f957e5
1 changed files with 4 additions and 3 deletions
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7
SharedGraphics/PNGLoader.cpp
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@ -99,7 +99,6 @@ static bool process_chunk(Streamer&, PNGLoadingContext& context);
RetainPtr<GraphicsBitmap> load_png(const String& path)
{
Stopwatch sw("load_png");
int fd = open(path.characters(), O_RDONLY);
if (fd < 0) {
perror("open");
@ -153,7 +152,7 @@ static byte paeth_predictor(int a, int b, int c)
static RetainPtr<GraphicsBitmap> load_png_impl(const byte* data, int data_size)
{
Stopwatch sw("load_png_impl");
Stopwatch sw("load_png_impl: total");
const byte* data_ptr = data;
int data_remaining = data_size;
@ -165,6 +164,8 @@ static RetainPtr<GraphicsBitmap> load_png_impl(const byte* data, int data_size)
PNGLoadingContext context;
context.compressed_data.ensure_capacity(data_size);
data_ptr += sizeof(png_header);
data_remaining -= sizeof(png_header);
@ -205,7 +206,7 @@ static RetainPtr<GraphicsBitmap> load_png_impl(const byte* data, int data_size)
}
{
Stopwatch sw("create bitmap");
Stopwatch sw("load_png_impl: create bitmap");
context.bitmap = GraphicsBitmap::create(GraphicsBitmap::Format::RGBA32, { context.width, context.height });
}