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Use DC clipping in AudioRenderer rather than wxMemoryDC + Blit

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In addition to being far simpler, this is marginally faster as
wxMemoryDC has a decent amount of overhead.

Originally committed to SVN as r6388.
This commit is contained in:
Thomas Goyne 2012-01-31 00:42:47 +00:00
parent 0bff490b7e
commit e5f1719d8f
2 changed files with 12 additions and 63 deletions
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73
aegisub/src/audio_renderer.cpp
View file

@ -188,7 +188,7 @@ void AudioRenderer::ResetBlockCount()
} }
wxBitmap AudioRenderer::GetCachedBitmap(int i, AudioRenderingStyle style) const wxBitmap *AudioRenderer::GetCachedBitmap(int i, AudioRenderingStyle style)
{ {
assert(provider); assert(provider);
assert(renderer); assert(renderer);
@ -202,7 +202,7 @@ wxBitmap AudioRenderer::GetCachedBitmap(int i, AudioRenderingStyle style)
} }
assert(bmp->IsOk()); assert(bmp->IsOk());
return *bmp; return bmp;
} }
@ -223,68 +223,17 @@ void AudioRenderer::Render(wxDC &dc, wxPoint origin, int start, int length, Audi
// And the offset in it to start its use at // And the offset in it to start its use at
int firstbitmapoffset = start % cache_bitmap_width; int firstbitmapoffset = start % cache_bitmap_width;
// The last bitmap required // The last bitmap required
int lastbitmap = end / cache_bitmap_width; int lastbitmap = std::min<int>(end / cache_bitmap_width, cache_numblocks - 1);
// How many columns of the last bitmap to use
int lastbitmapoffset = end % cache_bitmap_width;
// Check if we need to render any blank audio past the last bitmap from cache, // Set a clipping region so that the first and last bitmaps don't draw
// this happens if we're asked to render more audio than the provider has. // outside the requested range
if (lastbitmap >= (int)cache_numblocks) wxDCClipper clipper(dc, wxRect(origin, wxSize(length, pixel_height)));
origin.x -= firstbitmapoffset;
for (int i = firstbitmap; i <= lastbitmap; ++i)
{ {
lastbitmap = cache_numblocks - 1; dc.DrawBitmap(*GetCachedBitmap(i, style), origin);
lastbitmapoffset = cache_bitmap_width; origin.x += cache_bitmap_width;
if (firstbitmap > lastbitmap)
firstbitmap = lastbitmap;
}
// Three basic cases now:
// * Either we're just rendering blank audio,
// * Or there is exactly one bitmap to render,
// * Or there is more than one bitmap to render.
// origin is passed by value because we'll be using it as a local var to keep track
// of rendering progress!
if (start / cache_bitmap_width >= (int)cache_numblocks)
{
// Do nothing, the blank audio rendering will happen later
}
else if (firstbitmap == lastbitmap)
{
const int renderwidth = lastbitmapoffset - firstbitmapoffset;
wxBitmap bmp = GetCachedBitmap(firstbitmap, style);
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(renderwidth, pixel_height), &bmpdc, wxPoint(firstbitmapoffset, 0));
origin.x += renderwidth;
}
else
{
wxBitmap bmp;
{
bmp = GetCachedBitmap(firstbitmap, style);
// Can't use dc.DrawBitmap here because we need to clip the bitmap
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(cache_bitmap_width-firstbitmapoffset, pixel_height),
&bmpdc, wxPoint(firstbitmapoffset, 0));
origin.x += cache_bitmap_width-firstbitmapoffset;
}
for (int i = firstbitmap+1; i < lastbitmap; ++i)
{
bmp = GetCachedBitmap(i, style);
dc.DrawBitmap(bmp, origin);
origin.x += cache_bitmap_width;
}
{
bmp = GetCachedBitmap(lastbitmap, style);
// We also need clipping here
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(lastbitmapoffset+1, pixel_height), &bmpdc, wxPoint(0, 0));
origin.x += lastbitmapoffset+1;
}
} }
// Now render blank audio from origin to end // Now render blank audio from origin to end

2
aegisub/src/audio_renderer.h
View file

@ -129,7 +129,7 @@ class AudioRenderer {
/// ///
/// Will attempt retrieving the requested bitmap from the cache, creating it /// Will attempt retrieving the requested bitmap from the cache, creating it
/// if the cache doesn't have it. /// if the cache doesn't have it.
wxBitmap GetCachedBitmap(int i, AudioRenderingStyle style); const wxBitmap *GetCachedBitmap(int i, AudioRenderingStyle style);
/// @brief Update the block count in the bitmap caches /// @brief Update the block count in the bitmap caches
/// ///