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-rw-r--r--win32/PlatWin.cxx187
1 files changed, 121 insertions, 66 deletions
diff --git a/win32/PlatWin.cxx b/win32/PlatWin.cxx
index b2b90fa5e..342900703 100644
--- a/win32/PlatWin.cxx
+++ b/win32/PlatWin.cxx
@@ -730,14 +730,6 @@ void SurfaceGDI::RoundedRectangle(PRectangle rc, ColourDesired fore, ColourDesir
namespace {
-// Plot a point into a DWORD buffer symmetrically to all 4 quadrants
-void AllFour(DWORD *pixels, int width, int height, int x, int y, DWORD val) noexcept {
- pixels[y*width+x] = val;
- pixels[y*width+width-1-x] = val;
- pixels[(height-1-y)*width+x] = val;
- pixels[(height-1-y)*width+width-1-x] = val;
-}
-
constexpr DWORD dwordFromBGRA(byte b, byte g, byte r, byte a) noexcept {
return (a << 24) | (r << 16) | (g << 8) | b;
}
@@ -754,57 +746,138 @@ DWORD dwordMultiplied(ColourDesired colour, unsigned int alpha) noexcept {
static_cast<byte>(alpha));
}
+class DIBSection {
+ HDC hMemDC {};
+ HBITMAP hbmMem {};
+ HBITMAP hbmOld {};
+ SIZE size {};
+ DWORD *pixels = nullptr;
+public:
+ DIBSection(HDC hdc, SIZE size_) noexcept;
+ // Deleted so DIBSection objects can not be copied.
+ DIBSection(const DIBSection&) = delete;
+ DIBSection(DIBSection&&) = delete;
+ DIBSection &operator=(const DIBSection&) = delete;
+ DIBSection &operator=(DIBSection&&) = delete;
+ ~DIBSection() noexcept;
+ operator bool() const noexcept {
+ return hMemDC && hbmMem && pixels;
+ }
+ DWORD *Pixels() const noexcept {
+ return pixels;
+ }
+ unsigned char *Bytes() const noexcept {
+ return reinterpret_cast<unsigned char *>(pixels);
+ }
+ HDC DC() const noexcept {
+ return hMemDC;
+ }
+ void SetPixel(LONG x, LONG y, DWORD value) noexcept {
+ PLATFORM_ASSERT(x >= 0);
+ PLATFORM_ASSERT(y >= 0);
+ PLATFORM_ASSERT(x < size.cx);
+ PLATFORM_ASSERT(y < size.cy);
+ pixels[y * size.cx + x] = value;
+ }
+ void SetSymmetric(LONG x, LONG y, DWORD value) noexcept;
+};
+
+DIBSection::DIBSection(HDC hdc, SIZE size_) noexcept {
+ hMemDC = ::CreateCompatibleDC(hdc);
+ if (!hMemDC) {
+ return;
+ }
+
+ size = size_;
+
+ // -size.y makes bitmap start from top
+ const BITMAPINFO bpih = { {sizeof(BITMAPINFOHEADER), size.cx, -size.cy, 1, 32, BI_RGB, 0, 0, 0, 0, 0},
+ {{0, 0, 0, 0}} };
+ void *image = nullptr;
+ hbmMem = CreateDIBSection(hMemDC, &bpih, DIB_RGB_COLORS, &image, {}, 0);
+ if (!hbmMem || !image) {
+ return;
+ }
+ pixels = static_cast<DWORD *>(image);
+ hbmOld = SelectBitmap(hMemDC, hbmMem);
+}
+
+DIBSection::~DIBSection() noexcept {
+ if (hbmOld) {
+ SelectBitmap(hMemDC, hbmOld);
+ hbmOld = {};
+ }
+ if (hbmMem) {
+ ::DeleteObject(hbmMem);
+ hbmMem = {};
+ }
+ if (hMemDC) {
+ ::DeleteDC(hMemDC);
+ hMemDC = {};
+ }
+}
+
+void DIBSection::SetSymmetric(LONG x, LONG y, DWORD value) noexcept {
+ // Plot a point symmetrically to all 4 quadrants
+ const LONG xSymmetric = size.cx - 1 - x;
+ const LONG ySymmetric = size.cy - 1 - y;
+ SetPixel(x, y, value);
+ SetPixel(xSymmetric, y, value);
+ SetPixel(x, ySymmetric, value);
+ SetPixel(xSymmetric, ySymmetric, value);
+}
+
+constexpr SIZE SizeOfRect(RECT rc) noexcept {
+ return { rc.right - rc.left, rc.bottom - rc.top };
+}
+
+constexpr BLENDFUNCTION mergeAlpha = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
+
}
void SurfaceGDI::AlphaRectangle(PRectangle rc, int cornerSize, ColourDesired fill, int alphaFill,
ColourDesired outline, int alphaOutline, int /* flags*/ ) {
const RECT rcw = RectFromPRectangle(rc);
- if (rc.Width() > 0) {
- HDC hMemDC = ::CreateCompatibleDC(hdc);
- const int width = rcw.right - rcw.left;
- const int height = rcw.bottom - rcw.top;
- // Ensure not distorted too much by corners when small
- cornerSize = std::min(cornerSize, (std::min(width, height) / 2) - 2);
- const BITMAPINFO bpih = {{sizeof(BITMAPINFOHEADER), width, height, 1, 32, BI_RGB, 0, 0, 0, 0, 0},
- {{0, 0, 0, 0}}};
- void *image = nullptr;
- HBITMAP hbmMem = CreateDIBSection(hMemDC, &bpih,
- DIB_RGB_COLORS, &image, NULL, 0);
-
- if (hbmMem) {
- HBITMAP hbmOld = SelectBitmap(hMemDC, hbmMem);
-
- const DWORD valEmpty = dwordFromBGRA(0,0,0,0);
+ const SIZE size = SizeOfRect(rcw);
+
+ if (size.cx > 0) {
+
+ DIBSection section(hdc, size);
+
+ if (section) {
+
+ // Ensure not distorted too much by corners when small
+ const LONG corner = std::min<LONG>(cornerSize, (std::min(size.cx, size.cy) / 2) - 2);
+
+ constexpr DWORD valEmpty = dwordFromBGRA(0,0,0,0);
const DWORD valFill = dwordMultiplied(fill, alphaFill);
const DWORD valOutline = dwordMultiplied(outline, alphaOutline);
- DWORD *pixels = static_cast<DWORD *>(image);
- for (int y=0; y<height; y++) {
- for (int x=0; x<width; x++) {
- if ((x==0) || (x==width-1) || (y == 0) || (y == height-1)) {
- pixels[y*width+x] = valOutline;
+ // Draw a framed rectangle
+ for (int y=0; y<size.cy; y++) {
+ for (int x=0; x<size.cx; x++) {
+ if ((x==0) || (x==size.cx-1) || (y == 0) || (y == size.cy -1)) {
+ section.SetPixel(x, y, valOutline);
} else {
- pixels[y*width+x] = valFill;
+ section.SetPixel(x, y, valFill);
}
}
}
- for (int c=0; c<cornerSize; c++) {
- for (int x=0; x<c+1; x++) {
- AllFour(pixels, width, height, x, c-x, valEmpty);
+
+ // Make the corners transparent
+ for (LONG c=0; c<corner; c++) {
+ for (LONG x=0; x<c+1; x++) {
+ section.SetSymmetric(x, c - x, valEmpty);
}
}
- for (int x=1; x<cornerSize; x++) {
- AllFour(pixels, width, height, x, cornerSize-x, valOutline);
- }
-
- const BLENDFUNCTION merge = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
- AlphaBlend(hdc, rcw.left, rcw.top, width, height, hMemDC, 0, 0, width, height, merge);
+ // Draw the corner frame pieces
+ for (LONG x=1; x<corner; x++) {
+ section.SetSymmetric(x, corner - x, valOutline);
+ }
- SelectBitmap(hMemDC, hbmOld);
- ::DeleteObject(hbmMem);
+ AlphaBlend(hdc, rcw.left, rcw.top, size.cx, size.cy, section.DC(), 0, 0, size.cx, size.cy, mergeAlpha);
}
- ::DeleteDC(hMemDC);
} else {
BrushColour(outline);
FrameRect(hdc, &rcw, brush);
@@ -820,7 +893,6 @@ void SurfaceGDI::GradientRectangle(PRectangle rc, const std::vector<ColourStop>
void SurfaceGDI::DrawRGBAImage(PRectangle rc, int width, int height, const unsigned char *pixelsImage) {
if (rc.Width() > 0) {
- HDC hMemDC = ::CreateCompatibleDC(hdc);
if (rc.Width() > width)
rc.left += std::floor((rc.Width() - width) / 2);
rc.right = rc.left + width;
@@ -828,31 +900,14 @@ void SurfaceGDI::DrawRGBAImage(PRectangle rc, int width, int height, const unsig
rc.top += std::floor((rc.Height() - height) / 2);
rc.bottom = rc.top + height;
- const BITMAPINFO bpih = {{sizeof(BITMAPINFOHEADER), width, height, 1, 32, BI_RGB, 0, 0, 0, 0, 0},
- {{0, 0, 0, 0}}};
- void *image = nullptr;
- HBITMAP hbmMem = ::CreateDIBSection(hMemDC, &bpih,
- DIB_RGB_COLORS, &image, {}, 0);
- if (hbmMem) {
- HBITMAP hbmOld = SelectBitmap(hMemDC, hbmMem);
-
- for (int y=height-1; y>=0; y--) {
- // Bits flipped vertically
- unsigned char *pixel = static_cast<unsigned char *>(image) + RGBAImage::bytesPerPixel * y * width;
- RGBAImage::BGRAFromRGBA(pixel, pixelsImage, width);
- pixelsImage += RGBAImage::bytesPerPixel * width;
- }
-
- const BLENDFUNCTION merge = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
-
+ const SIZE size { width, height };
+ DIBSection section(hdc, size);
+ if (section) {
+ RGBAImage::BGRAFromRGBA(section.Bytes(), pixelsImage, width * height);
AlphaBlend(hdc, static_cast<int>(rc.left), static_cast<int>(rc.top),
- static_cast<int>(rc.Width()), static_cast<int>(rc.Height()), hMemDC, 0, 0, width, height, merge);
-
- SelectBitmap(hMemDC, hbmOld);
- ::DeleteObject(hbmMem);
+ static_cast<int>(rc.Width()), static_cast<int>(rc.Height()), section.DC(),
+ 0, 0, width, height, mergeAlpha);
}
- ::DeleteDC(hMemDC);
-
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-13 21:09:40 +0000