Use PNG Files

      Use PNG Files

      Hello,

      I just started my journey in homebrews for the Wii and am wondering how to load png files from png images directly? All I could find was a tutorial for jpeg which required you to run the image through a conversion tool that creates a .s file for each image:
      Example:

      Quellcode

      1. .rodata
      2. .balign 32
      3. .globl piclength
      4. .globl picdata
      6. piclength: .long picdataend - picdata
      7. picdata:
      8. .incbin "../images/hello.jpg"
      9. picdataend:
      Is there an easier way to do thisthat doesn't involve mixing powerpc assembly code for each image?

      So what exactly do you want to do, load JPEG/PNG files from the SD card or USB drive during homebrew execution, or do you want to bundle JPEG/PNG files into your program (like you're doing now) just without having to run that conversion tool?

      For the former you can use libfat ( wiibrew.org/wiki/Libfat ) which is part of libogc to read files from SD or USB.
      For the latter, you can add a makefile target that will automatically execute that conversion tool each time you compile your application.

      DevkitPro Archiv (alte Versionen / old versions): wii.leseratte10.de/devkitPro/
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      Leseratte schrieb:

      So what exactly do you want to do, load JPEG/PNG files from the SD card or USB drive during homebrew execution, or do you want to bundle JPEG/PNG files into your program (like you're doing now) just without having to run that conversion tool?

      For the former you can use libfat ( wiibrew.org/wiki/Libfat ) which is part of libogc to read files from SD or USB.
      For the latter, you can add a makefile target that will automatically execute that conversion tool each time you compile your application.
      Thanks for that link. I looked at the examples but, none of them shows how to load a png file off the sd/usb card. Here is an example of what I want to do:

      Quellcode

      1. #include <libfat.h>
      3. fatInit();
      5. public bool Image::load(string file) {
      8. }

      Nothing special just load an image to a variable to be used to render the image later. For comparison here is the java version of the code I am trying to convert:

      Java-Quellcode

      1. package org.homebrew.engine;
      3. import java.awt.Graphics;
      4. import java.awt.Image;
      5. import java.awt.MediaTracker;
      6. import java.awt.Rectangle;
      7. import java.awt.Toolkit;
      8. import org.havi.ui.HScene;
      10. /**
      11. * This class contains all the methods for displaying an image on screen. It is an extends the BaseGameObject
      12. * class.
      13. */
      14. public final class ImageEntity extends BaseGameEntity {
      15. // entity image
      16. protected Image img;
      17. protected HScene hscene;
      18. protected Graphics g;
      20. /**
      21. * class constructor
      22. * @param hscene scene to add to for drawing purposes
      23. */
      24. public ImageEntity(final HScene hscene) {
      25. this.hscene = hscene;
      26. img = null;
      27. setAlive(true);
      28. }
      30. /**
      31. * Returns the image to display
      32. * @return Image Image to display
      33. */
      34. public final Image getImage() {
      35. return img;
      36. }
      38. /**
      39. * Sets the image to display
      40. * @param img Image to display
      41. */
      42. public final void setImage(final Image img) {
      43. this.img = img;
      44. }
      46. /**
      47. * returns the width of the image
      48. * @return int images width
      49. */
      50. public final int width() {
      51. return img.getWidth(hscene);
      52. }
      54. /**
      55. * returns the height of the image
      56. * @return int images height
      57. */
      58. public final int height() {
      59. return img.getHeight(hscene);
      60. }
      62. /**
      63. * returns the x coordinate of the center of the image
      64. * @return int x coordinate of the center of the image
      65. */
      66. public final int getCenterX() {
      67. return getX() + width() / 2;
      68. }
      70. /**
      71. * returns the y coordinate of the center of the image
      72. * @return int y coordinate of the center of the image
      73. */
      74. public final int getCenterY() {
      75. return getY() + height() / 2;
      76. }
      78. /**
      79. * Sets the graphic context for the image
      80. * @param g new graphic context to use
      81. */
      82. public final void setGraphics(final Graphics g) {
      83. this.g = g;
      84. }
      86. /**
      87. * loads an image to display
      88. * @param filename filename of image to load
      89. */
      90. public final void load(final String filename) {
      91. try {
      92. Toolkit tk = Toolkit.getDefaultToolkit();
      93. img = tk.getImage(this.getClass().getResource(filename));
      94. MediaTracker mt = new MediaTracker(this.hscene);
      95. mt.addImage(img,1);
      96. mt.waitForAll();
      97. } catch (Exception e) {
      98. System.err.println("Couldn't load Image: " + filename + "\n");
      99. System.err.println("Exception: " + e.toString() + "\n");
      100. System.err.println("StackTrace: ");
      101. e.printStackTrace();
      103. }
      104. }
      106. /**
      107. * Draws the image on the screen on its x and y coordinate
      108. * @param g graphics context to use for drawing
      109. */
      110. public final void draw(final Graphics g) {
      111. if (img!=null) g.drawImage(img, getX(),getY(), null);
      112. }
      114. /**
      115. * Returns the bounding rectangle for the image
      116. * @return Rectangle bounding rectangle of image
      117. */
      118. public final Rectangle getBounds() {
      119. Rectangle r;
      120. r = new Rectangle((int)getX(), (int)getY(), (int)width(), (int)height());
      121. return r;
      122. }
      123. }
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