LOADIMAGE: Difference between revisions

Latest revision as of 17:05, 21 July 2024

The _LOADIMAGE function loads an image into memory and returns valid LONG image handle values that are less than -1.

Syntax

handle& = _LOADIMAGE(fileName$[, [mode&][, requirements$]])

Parameters

filename$ is literal or variable STRING file name value.
Optional mode& LONG values can be:
- 32 = 32-bit image.
- 33 = 32-bit hardware image.
- 256 = 8-bit (256 color) image using the QB64-PE master palette.
- 257 = 8-bit (256 color) image using an adaptive palette.
Optional requirements$ STRING values can be a combination of (version 3.6.0 and up):
- HARDWARE: Loads the image as a 32-bit hardware image. This can be used instead of mode 33 (above).
- ADAPTIVE: Loads the image as an 8-bit (256 color) image using an adaptive palette. This can be used instead of mode 257 (above).
- MEMORY: This will treat filename$ as a memory buffer containing the image file instead of a file name.
- SXBR2: Applies the Super-xBR 2x pixel scaler on the image.
- MMPX2: Applies the MMPX Style-Preserving 2x pixel scaler on the image.
- HQ2XA: Applies the High Quality Cartoon 2x pixel scaler on the image.
- HQ2XB: Applies the High Quality Complex 2x pixel scaler on the image.
- HQ3XA: Applies the High Quality Cartoon 3x pixel scaler on the image.
- HQ3XB: Applies the High Quality Complex 3x pixel scaler on the image.

Description

Image file formats JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC, PNM, PCX, SVG, ICO, CUR and QOI are supported. A path can also be given.
The mode& parameter can be 32, 33, 256 or 257. Omit to use the current graphic screen settings.
Mode 33 images are hardware accelerated and are created using _LOADIMAGE or _COPYIMAGE (version 1.000 and up).
Mode 256 images are loaded using the QB64-PE master VGA palette. This is the same palette that is used for 256 color screens like SCREEN 13.
Mode 257 images are loaded using an adaptive palette making these images look better than mode 256 when used with 32-bit color screens (version 3.1.0 and up).
Loaded images can be read invisibly using POINT. Image coordinates start at 0 up to the _WIDTH - 1 and _HEIGHT - 1.
Images can be made into a program SCREEN or page adopting the size and palette settings or placed using _PUTIMAGE.
Returns -1 as an invalid handle if it can't load the image. Valid LONG handle returns are less than -1 (handle& < -1).
Valid images only need to be loaded once. The handle can be used repeatedly until freed.
Images are not deallocated when the SUB or FUNCTION they are created in ends. Free them with _FREEIMAGE.
Use the various pixel scalers to scale and load extremely low resolution (retro) graphics without blurring.

Errors

Some picture file images may not load when a mode& value is designated. Try loading it without a mode& designation.
It is important to free unused or discarded images with _FREEIMAGE to prevent CPU memory overflow errors.
In text-only SCREEN 0, mode& 32 must be specified. When loading an _ICON image use 32 for the mode& too.

Availability

v0.800
all
yes
yes
yes

Mode 33 was added in QB64 v1.0, which makes it also available in all QB64-PE versions.
Mode 257 was added in QB64-PE v3.1.0, hence it's not available in the original QB64 versions.
In QB64-PE v3.6.0 this function got a new optional parameter requirements$ and the ability to load image files from memory.
SVG and QOI support was added in QB64-PE v3.9.0.
Pixel scaler support was added in QB64-PE v3.9.0.
ICO and CUR support was added in QB64-PE v3.14.0.

Examples

Example 1: To display an image in 32-bit color using its resolution as a program screen.

i& = _LOADIMAGE("mypic.jpg", 32)
SCREEN i&

Example 2: DRAWing and rotating an image 360 degrees using Turn Angle. POINT is used to read the invisible image source.

SCREEN _NEWIMAGE(800, 600, 32)
img& = _LOADIMAGE("QB64.PNG") 'use any 24/32 bit image

wide% = _WIDTH(img&): deep% = _HEIGHT(img&)
TLC$ = "BL" + STR$(wide% \ 2) + "BU" + STR$(deep% \ 2) 'start draw at top left corner
RET$ = "BD BL" + STR$(wide%) 'return to left side of image
_SOURCE img&
_DEST 0
DO
    FOR angle% = 0 TO 360 STEP 15
        CLS
        DRAW "BM400, 300" + "TA=" + VARPTR$(angle%) + TLC$
        FOR y = 0 TO deep% - 1
            FOR x = 0 TO wide% - 1
                DRAW "C" + STR$(POINT(x, y)) + "R1" 'color and DRAW each pixel
            NEXT
            DRAW RET$
        NEXT
        _DISPLAY 'NOTE: CPU usage will be HIGH!
    NEXT
LOOP UNTIL INKEY$ > ""

Code by Ted Weissgerber

Example 3: Load and scale an image from memory and display it on the screen.

OPTION _EXPLICIT

DIM Bee& '                                               the image file
DIM cx%, cy% '                                           center x,y coordinate for image

RESTORE Data_tbee0_png_2314
Bee& = _LOADIMAGE(LoadResource, 32, "memory, hq3xa") '   load image file from memory and scale it using a pixel scaler
SCREEN _NEWIMAGE(640, 480, 32) '                         enter a graphics screen
CLS , _RGB32(127, 127, 127) '                            clear the screen with gray
LOCATE 2, 15 '                                           position text cursor
PRINT "An image loaded into memory and placed on the screen."
cx% = (640 - _WIDTH(Bee&)) \ 2 '                         calculate x center position
cy% = (480 - _HEIGHT(Bee&)) \ 2 '                        calculate y center position
_PUTIMAGE (cx%, cy%), Bee& '                             place image onto center of screen
SLEEP '                                                  wait for key stroke
_FREEIMAGE Bee& '                                        remove image from memory
SYSTEM '                                                 return to OS


Data_tbee0_png_2314:
DATA 2314,2988,-1
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' Convert a base64 string to a normal string
FUNCTION DecodeBase64$ (s AS STRING)
    CONST BASE64_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

    DIM AS STRING buffer, result
    DIM AS _UNSIGNED LONG i
    DIM AS _UNSIGNED _BYTE char1, char2, char3, char4

    FOR i = 1 TO LEN(s) STEP 4
        char1 = INSTR(BASE64_CHARACTERS, CHR$(ASC(s, i))) - 1
        char2 = INSTR(BASE64_CHARACTERS, CHR$(ASC(s, i + 1))) - 1
        char3 = INSTR(BASE64_CHARACTERS, CHR$(ASC(s, i + 2))) - 1
        char4 = INSTR(BASE64_CHARACTERS, CHR$(ASC(s, i + 3))) - 1
        buffer = CHR$(_SHL(char1, 2) OR _SHR(char2, 4)) + CHR$(_SHL(char2 AND 15, 4) OR _SHR(char3, 2)) + CHR$(_SHL(char3 AND 3, 6) OR char4)

        result = result + buffer
    NEXT

    ' Remove padding
    IF RIGHT$(s, 2) = "==" THEN
        result = LEFT$(result, LEN(result) - 2)
    ELSEIF RIGHT$(s, 1) = "=" THEN
        result = LEFT$(result, LEN(result) - 1)
    END IF

    DecodeBase64 = result
END FUNCTION


' Loads a binary file encoded with Bin2Data
' Usage:
'   1. Encode the binary file with Bin2Data
'   2. Include the file or it's contents
'   3. Load the file like so:
'       Restore label_generated_by_bin2data
'       Dim buffer As String
'       buffer = LoadResource   ' buffer will now hold the contents of the file
FUNCTION LoadResource$
    DIM AS _UNSIGNED LONG ogSize, resize
    DIM AS _BYTE isCompressed

    READ ogSize, resize, isCompressed ' read the header

    DIM AS STRING buffer, result

    ' Read the whole resource data
    DO WHILE LEN(result) < resize
        READ buffer
        result = result + buffer
    LOOP

    ' Decode the data
    buffer = DecodeBase64(result)

    ' Expand the data if needed
    IF isCompressed THEN
        result = _INFLATE$(buffer, ogSize)
    ELSE
        result = buffer
    END IF

    LoadResource = result
END FUNCTION

Adapted from example code by Terry Ritchie

Example 4: Load SVG vector graphics data from memory and display it on the screen.

OPTION _EXPLICIT
$RESIZE:SMOOTH

RESTORE svg_data

DIM AS STRING svg, buffer

DO
    READ buffer
    svg = svg + buffer
LOOP WHILE LEN(buffer) > 0

DIM img AS LONG: img = _LOADIMAGE(svg, 32, "memory")

SCREEN _NEWIMAGE(_WIDTH(img) \ 2, _HEIGHT(img) \ 2, 32)

_PUTIMAGE , img

END

svg_data:
DATA "<svg xmlns='http://www.w3.org/2000/svg' width='1000pt' height='1000pt' viewBox='0 0 1000 1000'><g fill='#201701'"
DATA "><path d='M107 94c-3-1 2-4 2-1l-2 1ZM96 672h35l24 168 220-43 4 21-255 42-28-188ZM521 768l41-8 5 25c0 2-3 3-4 3l-"
DATA "36 6-6-26Z' opacity='.1'/></g><g fill='#020092'><path d='m107 94 2-1 683 134 76 328 2 7 23 101-176 35-3-5-24-104"
DATA " 108-11 14 65 59-9-40-168h-60l17 78-84 7-18-82c0-1 0-3-2-2h-21l-17-71 169 7-12-54-26-1c-5-16-8-32-11-49 9 1 17 3"
DATA " 26 3l-12-53-220-38 29 146c-25-3-50-9-74-14l-28-144-329-57 20 134c-15-1-30-5-46-8v-1L107 94Z'/><path d='m284 200"
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DATA "-5-24ZM325 425l77 1 8 43-77 1c-3-15-7-30-8-45Z'/></g><path fill='#00bbfd' d='m158 142 329 57 28 144 4 25 5 24-10"
DATA "-1-59-3-27-1 7 39h-33l-77-1-7-43-94-4-31-1-10-69-5-32-20-134m126 58 16 100h1c0 10 3 20 4 30l2 13c26 1 53 4 79 4l"
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DATA " 9 42 89 5-9-39-89-8Z'/><g fill='#070636'><path d='m71 256 61 11v1c2 11 4 21 4 32l-23-4 29 195c8 1 16-2 23 3l11 "
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DATA "'M132 268c16 3 31 7 46 8l5 32-46-8h-1c0-11-2-21-4-32ZM301 300l116 23 5 27-36-3c0-2-2-4-4-4l-77-13c-1-10-4-20-4-3"
DATA "0ZM515 343c24 5 49 11 74 14l4 22-50-8c-8-1-16-4-24-3l-4-25ZM224 378l94 4 7 43c1 15 5 30 8 45h-8l-8-2-80-5c-4-29-"
DATA "10-57-13-85ZM428 387l27 1c3 27 10 54 15 81h-60l-8-43h33l-7-39ZM514 391l10 1 63 9 5 27-72-9-6-28ZM632 396h14l17 7"
DATA "1h-37l-9-40 22 2-7-33ZM527 453c24 1 48 5 72 7 3 10 6 20 7 31l-38-3-4-20h-34l-3-15ZM165 491l43 2 37 243 359-59-22"
DATA "-115c-79 5-157 12-236 18l-11-67 205-7c6 2 12 2 18 2 20 2 41 2 61 3l17 84 54-6 24 104 3 5h-1l-12 2-49 10-446 88-2"
DATA "-13-31-216-11-75v-3Z'/><path d='m491 609 6-1 8 44-143 19-8-47 137-15Z'/></g><path fill='#013f59' d='m113 296 23 "
DATA "4h1l28 191v3c-7-5-15-2-23-3l-29-195Z' opacity='.4'/><path fill='#000314' d='M26 404c23 3 46 9 68 13l37 255H96l28"
DATA " 188 255-42-4-21 146-29 6 26 36-6c1 0 4-1 4-3l-5-25 11-2 11 50-23 5-441 86c-7 2-14 4-22 4L26 404Z' opacity='.1'/"
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DATA "><path fill='#febd04' d='m470 469 60-1h34l4 20 3 17-31 1-205 7 11 67c79-6 157-13 236-18l22 115-359 59-37-243-3-2"
DATA "2 120-1h8l77-1h60m21 140-137 15 8 47 143-19-8-44-6 1Z'/><g fill='#5d470f'><path d='M152 569h24l31 216-22 4-16-10"
DATA "6c-5-38-10-76-17-114ZM655 710l49-10v4l-35 6c-4 0-9 2-14 0Z' opacity='.4'/></g></svg>"
DATA ""

LOADIMAGE: Difference between revisions

Latest revision as of 17:05, 21 July 2024

Contents

Syntax

Parameters

Description

Errors

Availability

Examples

See also

Navigation menu

LOADIMAGE: Difference between revisions

Latest revision as of 17:05, 21 July 2024

Syntax

Parameters

Description

Errors

Availability

Examples

See also

Navigation menu

Search