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Fixed uiImage on Windows. Phew. Also made it have Windows decide the best parameters, like on other platforms.

This commit is contained in:
Pietro Gagliardi 2018-09-01 19:02:23 -04:00
parent 869992010c
commit db9977a4ee
1 changed files with 60 additions and 6 deletions
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66
windows/image.cpp
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@ -1,5 +1,8 @@
#include "uipriv_windows.hpp"
// TODO:
// - is the alpha channel ignored when drawing images in tables?
IWICImagingFactory *uiprivWICFactory = NULL;
HRESULT uiprivInitImage(void)
@ -39,17 +42,68 @@ void uiFreeImage(uiImage *i)
uiprivFree(i);
}
// to make things easier, we store images in WIC in the same way we store them in GDI (as system-endian ARGB) and premultiplied (as that's what AlphaBlend() expects (TODO confirm this))
// but what WIC format is system-endian ARGB? for a little-endian system, that's BGRA
// it turns out that the Windows 8 BMP encoder uses BGRA if told to (https://docs.microsoft.com/en-us/windows/desktop/wic/bmp-format-overview)
// it also turns out Direct2D requires PBGRA for drawing (https://docs.microsoft.com/en-us/windows/desktop/wic/-wic-bitmapsources-howto-drawusingd2d)
// so I guess we can assume PBGRA is correct...? (TODO)
#define formatForGDI GUID_WICPixelFormat32bppPBGRA
void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, int byteStride)
{
IWICBitmap *b;
WICRect r;
IWICBitmapLock *l;
uint8_t *pix, *data;
WICInProcPointer dipp;
UINT size;
UINT realStride;
int x, y;
HRESULT hr;
hr = uiprivWICFactory->CreateBitmapFromMemory(pixelWidth, pixelHeight,
GUID_WICPixelFormat32bppRGBA, byteStride,
byteStride * pixelHeight, (BYTE *) pixels,
hr = uiprivWICFactory->CreateBitmap(pixelWidth, pixelHeight,
formatForGDI, WICBitmapCacheOnDemand,
&b);
if (hr != S_OK)
logHRESULT(L"error calling CreateBitmapFromMemory() in uiImageAppend()", hr);
logHRESULT(L"error calling CreateBitmap() in uiImageAppend()", hr);
r.X = 0;
r.Y = 0;
r.Width = pixelWidth;
r.Height = pixelHeight;
hr = b->Lock(&r, WICBitmapLockWrite, &l);
if (hr != S_OK)
logHRESULT(L"error calling Lock() in uiImageAppend()", hr);
pix = (uint8_t *) pixels;
// TODO can size be NULL?
hr = l->GetDataPointer(&size, &dipp);
if (hr != S_OK)
logHRESULT(L"error calling GetDataPointer() in uiImageAppend()", hr);
data = (uint8_t *) dipp;
hr = l->GetStride(&realStride);
if (hr != S_OK)
logHRESULT(L"error calling GetStride() in uiImageAppend()", hr);
for (y = 0; y < pixelHeight; y++) {
for (x = 0; x < pixelWidth * 4; x += 4) {
union {
uint32_t v32;
uint8_t v8[4];
} v;
v.v32 = ((uint32_t) (pix[x + 3])) << 24;
v.v32 |= ((uint32_t) (pix[x])) << 16;
v.v32 |= ((uint32_t) (pix[x + 1])) << 8;
v.v32 |= ((uint32_t) (pix[x + 2]));
data[x] = v.v8[0];
data[x + 1] = v.v8[1];
data[x + 2] = v.v8[2];
data[x + 3] = v.v8[3];
}
pix += byteStride;
data += realStride;
}
l->Release();
i->bitmaps->push_back(b);
}
@ -172,7 +226,7 @@ HRESULT uiprivWICToGDI(IWICBitmap *b, HDC dc, int width, int height, HBITMAP *hb
scaler->Release();
return hr;
}
if (IsEqualGUID(guid, GUID_WICPixelFormat32bppRGBA))
if (IsEqualGUID(guid, formatForGDI))
src = scaler;
else {
hr = uiprivWICFactory->CreateFormatConverter(&conv);
@ -180,7 +234,7 @@ HRESULT uiprivWICToGDI(IWICBitmap *b, HDC dc, int width, int height, HBITMAP *hb
scaler->Release();
return hr;
}
hr = conv->Initialize(scaler, GUID_WICPixelFormat32bppRGBA,
hr = conv->Initialize(scaler, formatForGDI,
// TODO is the dither type correct in all cases?
WICBitmapDitherTypeNone, NULL, 0, WICBitmapPaletteTypeMedianCut);
scaler->Release();