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use client DC instead of screen DC; restore the alpha component if amask != 0.

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Vincent Wei
2022-11-08 17:28:23 +08:00
parent c8c6f470ce
commit 39f96f407f
1 changed files with 61 additions and 18 deletions
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src/gui/caret.c
+61 -18
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@@ -59,17 +59,22 @@
#include "cliprect.h"
#include "gal.h"
#include "internals.h"
#include "dc.h"
BOOL GUIAPI CreateCaret (HWND hWnd, PBITMAP pBitmap, int nWidth, int nHeight)
{
PMAINWIN pWin;
pWin = (PMAINWIN)hWnd;
if (!pWin->pCaretInfo) {
HDC hdc;
if (!(pWin->pCaretInfo = malloc (sizeof (CARETINFO))))
return FALSE;
/* Since 5.0.11: use client DC of the window instead of screen DC */
hdc = GetClientDC(hWnd);
pWin->pCaretInfo->pBitmap = pBitmap;
if (pBitmap) {
nWidth = pBitmap->bmWidth;
@@ -78,18 +83,22 @@ BOOL GUIAPI CreateCaret (HWND hWnd, PBITMAP pBitmap, int nWidth, int nHeight)
pWin->pCaretInfo->nWidth = nWidth;
pWin->pCaretInfo->nHeight = nHeight;
pWin->pCaretInfo->caret_bmp.bmType = BMP_TYPE_NORMAL;
pWin->pCaretInfo->caret_bmp.bmBitsPerPixel = BITSPERPHYPIXEL;
pWin->pCaretInfo->caret_bmp.bmBytesPerPixel = BYTESPERPHYPIXEL;
pWin->pCaretInfo->caret_bmp.bmBitsPerPixel =
GetGDCapability(hdc, GDCAP_BITSPP);
pWin->pCaretInfo->caret_bmp.bmBytesPerPixel =
GetGDCapability(hdc, GDCAP_BPP);
pWin->pCaretInfo->caret_bmp.bmWidth = nWidth;
pWin->pCaretInfo->caret_bmp.bmHeight = nHeight;
pWin->pCaretInfo->caret_bmp.bmAlphaMask = NULL;
pWin->pCaretInfo->caret_bmp.bmAlphaPitch = 0;
pWin->pCaretInfo->nBytesNr = GAL_GetBoxSize (__gal_screen,
pWin->pCaretInfo->nBytesNr = GAL_GetBoxSize (dc_HDC2PDC(hdc)->surface,
nWidth, nHeight, &pWin->pCaretInfo->caret_bmp.bmPitch);
pWin->pCaretInfo->pNormal = malloc (pWin->pCaretInfo->nBytesNr);
pWin->pCaretInfo->pXored = malloc (pWin->pCaretInfo->nBytesNr);
ReleaseDC(hdc);
if (pWin->pCaretInfo->pNormal == NULL ||
pWin->pCaretInfo->pXored == NULL) {
free (pWin->pCaretInfo);
@@ -219,8 +228,8 @@ void GetCaretBitmaps (PCARETINFO pCaretInfo)
int i;
int sx, sy;
HDC hdc;
Uint32 amask;
// convert to screen coordinates
sx = pCaretInfo->x;
sy = pCaretInfo->y;
@@ -231,36 +240,70 @@ void GetCaretBitmaps (PCARETINFO pCaretInfo)
pCaretInfo->caret_bmp.bmWidth,
pCaretInfo->caret_bmp.bmHeight,
&pCaretInfo->caret_bmp);
amask = GetGDCapability(hdc, GDCAP_AMASK);
ReleaseDC (hdc);
// generate XOR bitmap.
if (pCaretInfo->pBitmap) {
if (amask == 0) {
BYTE* normal;
BYTE* bitmap;
BYTE* xored;
normal = pCaretInfo->pNormal;
bitmap = pCaretInfo->pBitmap->bmBits;
xored = pCaretInfo->pXored;
for (i = 0; i < pCaretInfo->nBytesNr; i++)
xored[i] = normal[i] ^ bitmap[i];
if (pCaretInfo->pBitmap) {
bitmap = pCaretInfo->pBitmap->bmBits;
for (i = 0; i < pCaretInfo->nBytesNr; i++)
xored[i] = normal[i] ^ bitmap[i];
}
else {
for (i = 0; i < pCaretInfo->nBytesNr; i++)
xored[i] = normal[i] ^ 0xFF;
}
}
else {
// Since 5.0.11: restore the alpha component if having alpha component.
int x, y;
BYTE* normal;
BYTE* xored;
BYTE xor_byte;
BYTE* bitmap = NULL;
gal_pixel pix_normal, pix_bitmap, pix_xored, bits_alpha;
if (BITSPERPHYPIXEL < 8)
xor_byte = 0x0F;
else
xor_byte = 0xFF;
_DBG_PRINTF("restore alpha component for amask != 0\n");
normal = pCaretInfo->pNormal;
xored = pCaretInfo->pXored;
for (y = 0; y < pCaretInfo->caret_bmp.bmHeight; y++) {
normal = pCaretInfo->pNormal + pCaretInfo->caret_bmp.bmPitch * y;
xored = pCaretInfo->pXored + pCaretInfo->caret_bmp.bmPitch * y;
if (pCaretInfo->pBitmap)
bitmap = pCaretInfo->pBitmap->bmBits +
pCaretInfo->caret_bmp.bmPitch * y;
for (i = 0; i < pCaretInfo->nBytesNr; i++)
xored[i] = normal[i] ^ xor_byte;
for (x = 0; x < pCaretInfo->caret_bmp.bmWidth; x++) {
pix_normal = _mem_get_pixel(normal,
pCaretInfo->caret_bmp.bmBytesPerPixel);
if (pCaretInfo->pBitmap) {
pix_bitmap = _mem_get_pixel(bitmap,
pCaretInfo->caret_bmp.bmBytesPerPixel);
}
else {
pix_bitmap = 0xFFFFFFFF;
}
bits_alpha = pix_normal & amask;
pix_xored = pix_normal ^ pix_bitmap;
pix_xored &= ~amask;
pix_xored |= bits_alpha;
_mem_set_pixel(xored,
pCaretInfo->caret_bmp.bmBytesPerPixel, pix_xored);
normal += pCaretInfo->caret_bmp.bmBytesPerPixel;
xored += pCaretInfo->caret_bmp.bmBytesPerPixel;
if (pCaretInfo->pBitmap)
bitmap += pCaretInfo->caret_bmp.bmBytesPerPixel;
}
}
}
}