ObjReader Community
GDImage => The concept => Topic started by: Patrice Terrier on January 11, 2022, 05:25:06 pm
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This VS2019 project, is based on GDImage64 version 7.10,
The coloring functions of GDI32 ExtFoodFill and GetPixel are working only in 24-bit RGB colors, without alpha channel.
To work around this limitation, here is a project that illustrates the clipping functions of GDImage64.
The principle is the same as in PhotoShop, a checkerboard is used in the background to visualize the transparent areas.
All fill and pixel selection functions work in 32-bit mode (with alpha channel).
When filling it is possible to use a tolerance factor, which allows to remove the artifacts caused by the jpeg compression.
Note: Cropped images must be saved in PNG format to preserve transparency.
About the interface:
It is entirely done with 2 GDImage controls, one for the work area (with the image),
the other containing the controls:
- The color selector, which allows you to use either a color picker or a combo box to choose the desired color.
- 2 vertical sliders, one to choose the level of transparency, the other for the filling tolerance.
- Several icons to choose or save an image, or cancel the modifications.
- Information concerning the coordinates of the cursor, as well as the color of the pixel flown over with its components A, R, G, B.
(http://www.objreader.com/download/images/floodfill.jpg)
New in version 7.10
void zDetectDeviceAudio(IN HWND hWnd);
Populate a ComboBox or a ListBox with the name of available audio devices.
void zDetectDeviceVideo(IN HWND hWnd);
Populate a ComboBox or a ListBox with the name of available video devices.
WCHAR* ZI_SpinnerGetTime();
Get a formated string (HH:MM:SS) matching the spinner ellapsed time.
void ZI_SetHdcColorAlpha(IN HDC hDC, IN long Color, IN BYTE Alpha);
Use the HDC of a selected bitmap, to change the alpha channel of a specific color.
void ZI_SetBitmapColorAlpha(IN HBITMAP hBmp, IN long Color, IN BYTE Alpha);
Use a HBITMAP handle, to change the alpha channel of a specific color.
HBITMAP CropBitmapToBound(IN HBITMAP hBmp);
Clip all pixels using a null alpha channel.
HBITMAP ZI_CropBitmapColorToBound(IN HBITMAP hBmp, IN DWORD ARGBcolor);
Clip all pixels matching a specific Alpha, red, green, blue color.
void ZI_LinearFlood (IN HDC hDC, IN long x, IN long y, IN DWORD FillColor, IN long Tolerance);
This procedure fills an area of the display surface (HDC) with the FillColor,
using x-y coordinates for seed point (SeedColor and FillColor must be different).
The Tolerance is to consider the pixels within a specific range to match the SeedColor.
DWORD ZI_GetPixel(IN HDC hDC, IN long x, IN long y);
This is a 32-bit replacement for the 24-bit only GetPixel API, returning a color including the alpha channel.
HBITMAP ZI_CreateTileBitmap(IN WCHAR* szFileToTile, IN long Xin, IN long Yin, IN WORD nBitCount);
Create a specific 24 or 32-bit (nBitCount) tiled bitmap using a source file image to paint the Xin/Yin area of the resulting HBITMAP.
DWORD ZD_GetBitmapPixel(IN long nID, IN long x, IN long y);
Get the Alpha,red,green,blue color of a specific nID sprite object.
void ZD_LinearFlood(IN long nID, IN long x, IN long y, IN DWORD FillColor, IN long Tolerance);
This procedure fills an area of a specific nID sprite object with the FillColor,
using x-y coordinates as seed point (SeedColor and FillColor must be different).
The Tolerance is to consider the pixels within a specific range to match the SeedColor.