src/ppapi/examples/2d/graphics_2d_example.c

   1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file.
   4  */
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #include "ppapi/c/pp_completion_callback.h"
   9 #include "ppapi/c/pp_errors.h"
  10 #include "ppapi/c/pp_instance.h"
  11 #include "ppapi/c/pp_module.h"
  12 #include "ppapi/c/pp_rect.h"
  13 #include "ppapi/c/pp_var.h"
  14 #include "ppapi/c/ppb.h"
  15 #include "ppapi/c/ppb_core.h"
  16 #include "ppapi/c/ppb_graphics_2d.h"
  17 #include "ppapi/c/ppb_image_data.h"
  18 #include "ppapi/c/ppb_instance.h"
  19 #include "ppapi/c/ppb_view.h"
  20 #include "ppapi/c/ppp.h"
  21 #include "ppapi/c/ppp_instance.h"
  22
  23 PPB_GetInterface g_get_browser_interface = NULL;
  24
  25 const PPB_Core* g_core_interface;
  26 const PPB_Graphics2D* g_graphics_2d_interface;
  27 const PPB_ImageData* g_image_data_interface;
  28 const PPB_Instance* g_instance_interface;
  29 const PPB_View* g_view_interface;
  30
  31 /* PPP_Instance implementation -----------------------------------------------*/
  32
  33 struct InstanceInfo {
  34   PP_Instance pp_instance;
  35   struct PP_Size last_size;
  36
  37   struct InstanceInfo* next;
  38 };
  39
  40 /** Linked list of all live instances. */
  41 struct InstanceInfo* all_instances = NULL;
  42
  43 /** Returns a refed resource corresponding to the created graphics 2d. */
  44 PP_Resource MakeAndBindGraphics2D(PP_Instance instance,
  45                                   const struct PP_Size* size) {
  46   PP_Resource graphics;
  47
  48   graphics = g_graphics_2d_interface->Create(instance, size, PP_FALSE);
  49   if (!graphics)
  50     return 0;
  51
  52   if (!g_instance_interface->BindGraphics(instance, graphics)) {
  53     g_core_interface->ReleaseResource(graphics);
  54     return 0;
  55   }
  56   return graphics;
  57 }
  58
  59 void FlushCompletionCallback(void* user_data, int32_t result) {
  60   /* Don't need to do anything here. */
  61 }
  62
  63 void Repaint(struct InstanceInfo* instance, const struct PP_Size* size) {
  64   PP_Resource image, graphics;
  65   struct PP_ImageDataDesc image_desc;
  66   uint32_t* image_data;
  67   int num_words, i;
  68
  69   /* Create image data to paint into. */
  70   image = g_image_data_interface->Create(
  71       instance->pp_instance, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, PP_TRUE);
  72   if (!image)
  73     return;
  74   g_image_data_interface->Describe(image, &image_desc);
  75
  76   /* Fill the image with blue. */
  77   image_data = (uint32_t*)g_image_data_interface->Map(image);
  78   if (!image_data) {
  79     g_core_interface->ReleaseResource(image);
  80     return;
  81   }
  82   num_words = image_desc.stride * size->height / 4;
  83   for (i = 0; i < num_words; i++)
  84     image_data[i] = 0xFF0000FF;
  85
  86   /* Create the graphics 2d and paint the image to it. */
  87   graphics = MakeAndBindGraphics2D(instance->pp_instance, size);
  88   if (!graphics) {
  89     g_core_interface->ReleaseResource(image);
  90     return;
  91   }
  92
  93   g_graphics_2d_interface->ReplaceContents(graphics, image);
  94   g_graphics_2d_interface->Flush(graphics,
  95       PP_MakeCompletionCallback(&FlushCompletionCallback, NULL));
  96
  97   g_core_interface->ReleaseResource(graphics);
  98   g_core_interface->ReleaseResource(image);
  99 }
 100
 101 /** Returns the info for the given instance, or NULL if it's not found. */
 102 struct InstanceInfo* FindInstance(PP_Instance instance) {
 103   struct InstanceInfo* cur = all_instances;
 104   while (cur) {
 105     if (cur->pp_instance == instance)
 106       return cur;
 107     cur = cur->next;
 108   }
 109   return NULL;
 110 }
 111
 112 PP_Bool Instance_DidCreate(PP_Instance instance,
 113                            uint32_t argc,
 114                            const char* argn[],
 115                            const char* argv[]) {
 116   struct InstanceInfo* info =
 117       (struct InstanceInfo*)malloc(sizeof(struct InstanceInfo));
 118   info->pp_instance = instance;
 119   info->last_size.width = 0;
 120   info->last_size.height = 0;
 121
 122   /* Insert into linked list of live instances. */
 123   info->next = all_instances;
 124   all_instances = info;
 125   return PP_TRUE;
 126 }
 127
 128 void Instance_DidDestroy(PP_Instance instance) {
 129   /* Find the matching item in the linked list, delete it, and patch the
 130    * links.
 131    */
 132   struct InstanceInfo** prev_ptr = &all_instances;
 133   struct InstanceInfo* cur = all_instances;
 134   while (cur) {
 135     if (instance == cur->pp_instance) {
 136       *prev_ptr = cur->next;
 137       free(cur);
 138       return;
 139     }
 140     prev_ptr = &cur->next;
 141     cur = cur->next;
 142   }
 143 }
 144
 145 void Instance_DidChangeView(PP_Instance pp_instance,
 146                             PP_Resource view) {
 147   struct PP_Rect position;
 148   struct InstanceInfo* info = FindInstance(pp_instance);
 149   if (!info)
 150     return;
 151
 152   if (g_view_interface->GetRect(view, &position) == PP_FALSE)
 153     return;
 154
 155   if (info->last_size.width != position.size.width ||
 156       info->last_size.height != position.size.height) {
 157     /* Got a resize, repaint the plugin. */
 158     Repaint(info, &position.size);
 159     info->last_size.width = position.size.width;
 160     info->last_size.height = position.size.height;
 161   }
 162 }
 163
 164 void Instance_DidChangeFocus(PP_Instance pp_instance, PP_Bool has_focus) {
 165 }
 166
 167 PP_Bool Instance_HandleDocumentLoad(PP_Instance pp_instance,
 168                                     PP_Resource pp_url_loader) {
 169   return PP_FALSE;
 170 }
 171
 172 static PPP_Instance instance_interface = {
 173   &Instance_DidCreate,
 174   &Instance_DidDestroy,
 175   &Instance_DidChangeView,
 176   &Instance_DidChangeFocus,
 177   &Instance_HandleDocumentLoad
 178 };
 179
 180
 181 /* Global entrypoints --------------------------------------------------------*/
 182
 183 PP_EXPORT int32_t PPP_InitializeModule(PP_Module module,
 184                                        PPB_GetInterface get_browser_interface) {
 185   g_get_browser_interface = get_browser_interface;
 186
 187   g_core_interface = (const PPB_Core*)
 188       get_browser_interface(PPB_CORE_INTERFACE);
 189   g_instance_interface = (const PPB_Instance*)
 190       get_browser_interface(PPB_INSTANCE_INTERFACE);
 191   g_image_data_interface = (const PPB_ImageData*)
 192       get_browser_interface(PPB_IMAGEDATA_INTERFACE);
 193   g_graphics_2d_interface = (const PPB_Graphics2D*)
 194       get_browser_interface(PPB_GRAPHICS_2D_INTERFACE);
 195   g_view_interface = (const PPB_View*)
 196       get_browser_interface(PPB_VIEW_INTERFACE);
 197   if (!g_core_interface || !g_instance_interface || !g_image_data_interface ||
 198       !g_graphics_2d_interface || !g_view_interface)
 199     return -1;
 200
 201   return PP_OK;
 202 }
 203
 204 PP_EXPORT void PPP_ShutdownModule() {
 205 }
 206
 207 PP_EXPORT const void* PPP_GetInterface(const char* interface_name) {
 208   if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0)
 209     return &instance_interface;
 210   return NULL;
 211 }