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Merge pull request #402 from mischnic/table-image-fix 

"Fix uiImage on mac"

uiImageAppend()'s swizzling only works if the pixel stride is a multiple of four. Don't swizzle the pixel stride pixels.

Also a minor documentation fix.
This commit is contained in:
Pietro Gagliardi 2018-08-06 08:15:36 -04:00 committed by GitHub
parent e0ca00e55b 68dade3e81
commit 976279ef33
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 15 additions and 11 deletions
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20
darwin/image.m
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@ -34,7 +34,7 @@ void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, in
{
NSBitmapImageRep *repCalibrated, *repsRGB;
uint8_t *swizzled, *bp, *sp;
int n;
int x, y;
unsigned char *pix[1];
// OS X demands that R and B are in the opposite order from what we expect
@ -43,13 +43,17 @@ void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, in
swizzled = (uint8_t *) uiprivAlloc((byteStride * pixelHeight) * sizeof (uint8_t), "uint8_t[]");
bp = (uint8_t *) pixels;
sp = swizzled;
for (n = 0; n < byteStride * pixelHeight; n += 4) {
sp[0] = bp[2];
sp[1] = bp[1];
sp[2] = bp[0];
sp[3] = bp[3];
sp += 4;
bp += 4;
for (y = 0; y < pixelHeight; y++){
for (x = 0; x < pixelWidth; x++) {
sp[0] = bp[2];
sp[1] = bp[1];
sp[2] = bp[0];
sp[3] = bp[3];
sp += 4;
bp += 4;
}
// jump over unused bytes at end of line
bp += byteStride - pixelWidth * 4;
}
pix[0] = (unsigned char *) swizzled;

6
uitable.h
View File

@ -19,7 +19,7 @@
// desktop systems at the time of writing (mid-2018)
//
// uiImage is very simple: it only supports non-premultiplied 32-bit
// ARGB images, and libui does not provide any image file loading
// RGBA images, and libui does not provide any image file loading
// or image format conversion utilities on top of that.
typedef struct uiImage uiImage;
@ -36,8 +36,8 @@ _UI_EXTERN void uiFreeImage(uiImage *i);
// uiImageAppend adds a representation to the uiImage.
// pixels should point to a byte array of non-premultiplied pixels
// stored in [R G B A] order (so ((uint8_t *) pixels)[0] is the A of the
// first pixel and [3] is the B of the first pixel). pixelWidth and
// stored in [R G B A] order (so ((uint8_t *) pixels)[0] is the R of the
// first pixel and [3] is the A of the first pixel). pixelWidth and
// pixelHeight is the size *in pixels* of the image, and pixelStride is
// the number *of bytes* per row of the pixels array. Therefore,
// pixels itself must be at least byteStride * pixelHeight bytes long.